Title:
Mining apparatus
United States Patent 2075954


Abstract:
This invention relates to mining apparatus, and more particularly, but not exclusively, to improvements in a coal mining apparatus of the combined horizontal and shear cutter, wheel mounted, track supported and guided type. An object of this invention is to provide an improved coal mining...



Inventors:
Osgood, Charles F.
Application Number:
US73763134A
Publication Date:
04/06/1937
Filing Date:
07/30/1934
Assignee:
SULLIVAN MACHINERY CO
Primary Class:
Other Classes:
414/917
International Classes:
E21C31/00
View Patent Images:



Description:

This invention relates to mining apparatus, and more particularly, but not exclusively, to improvements in a coal mining apparatus of the combined horizontal and shear cutter, wheel mounted, track supported and guided type.

An object of this invention is to provide an improved coal mining apparatus. Another object is to provide an improved coal mining apparatus of the combined horizontal and shear cutter, wheel mounted type having improved adjustable kerf cutting mechanism. Yet another object is to provide an improved coal cutting apparatus of the combined type having improved kerf cutting mechanism and improved adjustable supporting means having relatively great universality whereby the kerf cutter may be positioned to cut kerfs at any desired location in the coal face and in the ribs. Yet another object is to provide in a cutter supporting and adjusting means of the above character, improved parallel motion adjusting means whereby the kerf cutter may be moved through a series of parallel cutting planes while the kerf cutter is always maintained parallel to such planes, and wherein the parallel motion means is adjustable to move the kerf cutter angularly through a series of relatively inclined cutting planes with respect to said parallel cutting planes. A further object is to provide an improved parallel motion supporting and adjusting structure wherein certain of the parallel motion elements are relatively adjustable to effect movement of the kerf cutter through a relatively wide range of relatively inclined cutting planes. Yet another object is to provide improved kerf cutter cutting means whereby the tilting function is effected by changing the effective length of one of the parallel motion elements. A still further object is to provide an improved kerf cutter supporting and adjusting means for moving the kerf cutter into parallel cutting planes while the kerf cutter always remains parallel to said planes and including means for swinging the kerf cutter through a relatively wide range of relatively inclined cutting planes. Still another object of this invention is to provide an improved coal mining apparatus of a truly universal character having kerf cutter adjusting means of an extremely flexible nature whereby kerfs may be cut in the coal face and in the ribs at any desired location, thereby to enable the apparatus to accommodate itself to practically any cutting condition encountered. These and other objects and advantages of the invention will, however, subsequently more fully appear.

In the accompanying drawings there are shown for purposes of illustration one form and several modifications thereof which the invention may assume in practice.

In these drawings,Fig. 1 is a plan view of the illustrative embodiment of the improved mining apparatus showing one illustrative form of the kerf cutter supporting and adjusting means.

Pig. 2 is a side elevational view of the mining apparatus shown in Fig. 1. Fig. 3 is an enlarged, central, longitudinally extending vertical sectional view taken substantially on line 3-3 of Fig. 1.

Fig. 4 is a horizontal sectional view taken substantially on line 4-4 of Fig. 2. Fig. 5 is an enlarged, longitudinally extending, vertical sectional view taken substantially on line 5-5 of Fig. 1.

Fig. 6 is a horizontal sectional view taken substantially on line 6-6 of Figs. 2 and 5.

Fig. 7 is a cross sectional view taken on line 7-7 of Figs. 2 and 5.

Fig. 8 is a longitudinally extending vertical sectional view taken on line 8-8 of Fig. 6.

Fig. 9 is a cross sectional view taken on line 9-9 of Fig. 5.

Fig. 10 is an enlarged, longitudinally extending, vertical sectional view taken on line 10-10 of Figs. 1 and 11.

Fig. 11 is a horizontal sectional view taken substantially on line 11-11 of Figs. 2 and 10.

Fig. 12 is a detail sectional view taken on line 12-12 of Fig. 11 showing the kerf cutter swinging mechanism.

Fig. 13 is a horizontal sectional view taken substantially on line 13-13 of Pig. 3.

Fig. 14 is a cross sectional view taken on line 14-14 of Fig. 13.

Fig. 15 is a transverse vertical sectional view taken on line 15-15 of Fig. 3. Fig. 16 is a cross sectional view taken on line 16-16 of Fig. 13.

Fig. 17 is a detail sectional view taken on line 17-17 of Fig. 16.

Fig. 18 is a cross sectional view taken on line 18-18 of Fig. 3.

Fig. 19 is a fragmentary view, similar to the forward portion of Fig. 2, showing a modified form of kerf cutter adjusting means, parts being shown in section to show structural details. Fig. 20 is a view similar to Fig. 19 showing a further modified form of kerf cutter adjusting means.

Fig. 21 shows still another modified form of kerf cutter supporting and adjusting means. In the illustrative embodiment of the invention disclosed in Figs. 1 to 18, inclusive, there is shown a coal mining apparatus of the combined horizontal and shear cutter, wheel mounted, track supported and guided type, adapted to operate from the mine trackway, although it will be evident that the various features of the improved mining apparatus may be embodied in coal cutting machines of various other types. The mining apparatus disclosed herein generally comprises a self-propelled portable base, herein in the form of a truck frame I mounted on wheels 2 adapted to run along a mine trackway 3 laid on the mine floor. Supported on the truck frame I for rotative movement relative thereto about a vertical axis is a horizontal turntable 4 having mounted thereon an arm-like horizontal frame 5 overlying the truck frame and at its forward extremity overhanging the forward end of the truck frame. Rotatably mounted on the forward extremity of the arm-like frame 5 is a revolving cutter head 6 arranged in advance of the forward end of the truck frame and having adjustably mounted thereon an adjustable parallel motion supporting structure 7 on the outer extremity of which is swingably mounted a cutter support 8 carrying a pivotal kerf cutter 9. Mounted on the rearward portion of the truck frame I is a motor 10 operatively connected to the means for rotating the turntable, for rotating the revolving head 6, for adjusting the supporting structure 7 and swinging the cutter support 8, for driving the kerf cutter 9 and for propelling the apparatus, the motor 10 constituting the sole prime mover for driving all the various mechanisms of the apparatus.

Referring to the turntable 4 and the horizontal arm structure 5 mounted thereon, it will be noted that the turntable 4 comprises a circular frame 12 (Fig. 3) having a depending annular bearing flange 13 rotatably mounted on a bearing sleeve 14 carried by an upstanding annular flange 15 formed on the upper portion of the truck frame I. Secured to the bottom of the arm frame 5 is a retaining and guiding block 16 underlying the lower surface of the annular guide flange 15 in the manner shown in Fig. 3. Formed on the rearward portion of the cylindrical turntable frame 12 is an arcuate retaining and guiding flange 17 movable in an arcuate guideway 18 formed by a segmental plate 19 secured to the truck frame. The horizontal arm frame 5 is herein formed integral with the circular turntable frame 12 and herein overlies the truck frame I and at its forward extremity overhangs the front end of the truck frame, and this arm frame is provided with an arcuate bottom bearing projection 20 guided in an arcuate guideway 2 1 formed on the top surface of the truck frame. The forward overhanging extremity of the arm frame is herein in the form of a casting 22 suitably secured to the main arm casting, and this detachable frame 22 is provided with a depending portion 23 extending downwardly in advance of the forward end of the truck frame. This frame 22 provides a circular flange 24 to which is secured as by screws 25 a circular bearing frame 26 for the revolving cutter head 6.

The revolving cutter head structure 6 and the adjustable cutter supporting and adjusting structure 7 mounted thereon comprise a cutter head frame 27 on which the adjustable supporting structure is mounted. The circular bearing frame 26 is herein in the form of an annular bearing and retaining sleeve having an inwardly directed flange 28, and between this flange and a shoulder 29 on the frame 22 there is rotatably mounted a cylindrical bearing sleeve 30 which herein forms a rotatable support for the revolving head 6. This bearing sleeve 30 is secured to the cutter head frame 27 as by screws 31. Referring more particularly to the adjustable supporting structure 7, it will be observed that formed on the rotatable head frame 27 and extending forwardly therefrom are projections 32, 32 which are parallel to each other and parallel to and equidistant from the head axis. In each of these projections is a bearing 33 in alinement with the other of said bearings on a line which is perpendicular to and intersects the cutter head axis, and in said bearings 33, 33 is mounted a transverse hinge shaft 34. Forward of the head structure is a pair of parallel supporting arms or links 35, 36 which constitute a parallel motion mechanism between the revolvable head structure and the kerf cutter. The arm 35 constitutes the main supporting arm for the kerf cutter and has at its rear end, projections 37, 37, each of which overlaps the outer face of one of the projections 32 of the head structure, as shown in Fig. 7. These projections 37, 37 are mounted on the bearing sleeves 33, 33 carried by the projections 32, 32, and the bearing sleeves 33 extend through the projections 32 and 37 to provide the journals for the latter, said journals being on an axial line which is perpendicular to and intersects the head axis. The rear end of the secondary link or arm 36 is pivotally mounted on alined bearing sleeves 38, 38 supported by the projections 32, 32 and is provided with projections 39, 39, each of which overlaps the outer face of one of the projections 32 of the head structure, as shown in Fig. 6; and the bearings 38 extend through the projections 39 to form journals for the arm 36, and these journals are on an axial line which is parallel with the axial line of the rear pivotal axis of the arm 35. The main body of the main arm or link 35 is herein in the form of a tubular member 40 having secured thereto at its outer extremity a bifurcated or yoke-shaped member 41 having arm-like portions 42 and 43 carrying bearing sleeves 44 in which are journaled trunnions 45, 45 formed integral with the swingable cutter support 8. This swingable cutter support has projections 48 to which is pivotally connected at 47 the bifurcated forward extremity of the secondary link 36. The cutter support 8 is swingably mounted on the outer extremity of the main arm 35 about an axis parallel with the arm pivot axis, and the secondary arm pivot with the swingable cutter support is so arranged as to form a parallel motion supporting structure between the revolving cutter head and the swingable cutter support 8, so when the arms are swung about their pivots into different angular positions relative to the cutter head, the kerf cutter is maintained at all times parallel to a line parallel with the axial line of the head, and by these arms the kerf cutter may be adjusted into parallel planes toward and from and into the axial line of the cutter head.

The driving connections between the motor 10 and the kerf cutter comprise, as shown in Fig. 3, a bevel pinion 48 keyed to the forward extremity of a transmission shaft 49 herein connected at its rear end by a suitable coupling to the motor power shaft. The shaft 49 is horizontally disposed and extends longitudinally of the truck frame and is suitably journaled on the latter.

The bevel gear 48 meshes with a large bevel gear 50 keyed to a vertical shaft 51 suitably journaled at its lower end within a depending frame portion 52 integral with the truck frame and at its upper end within a depending frame portion 53 secured to the turntable frame 12 and arranged with its axis coincident with the turntable axis. Integral with the gear 50 is a bevel gear 54 meshing with a bevel gear 55 keyed to the rear end of a horizontal shaft 56 herein arranged with its axis extending radially with respect to the turntable axis and suitably journaled within the arm frame structure 5. Keyed to the forward end of the shaft 56 is a spur gear 57 meshing with a spur gear 58 keyed to a horizontal shaft 59 herein arranged with its axis coincident with the cutter head axis and suitably journaled in the frames 22 and 27. As shown in Fig. 5, keyed to the forward end of the shaft 59 is a bevel gear 60 meshing with a bevel gear 61 fixed to a tubular shaft 62 journaled on the hinge shaft 34, as shown in Fig. 7. Meshing with the bevel gear 61 and driven thereby is a bevel gear 63 keyed to the rear end of a shaft 64 herein extending longitudinally of the main supporting arm or link 35 and suitably journaled thereon. Keyed to the forward end of the shaft 64 is a bevel gear 65 meshing, as shown in Fig. 11, with a bevel gear 66 journaled on a shaft 67 supported by one of the arm por30 tions of the outer bifurcated frame 41 of the arm 35. The bevel gear 66 meshes with and drives a bevel gear 68 keyed to a shaft 69 herein arranged with its axis coincident with the pivotal axis of the cutter support 8 and suitably jour35 naled in the adjacent arm portion 43 and trunnion 45. Keyed to the inner end of the shaft 69 is a bevel gear 70 meshing with a bevel gear 71 connectible by a jaw clutch 72 to a shaft 73 suitably journaled in the frame 74 of the cutter sup40 port 8. Fixed to and driven by the shaft 73 is a chain sprocket 75 which engages and drives an endless cutter chain 76 mounted in a guideway formed about the margin of a cutter bar 77 of the kerf cutter 9 for circulation in an orbital path 45 about the cutter bar. The clutch 72 is operated by a shipper yoke 78 having a suitable operating handle 79. It will thus be seen that the cutter chain 76 mav he connenpterid~i a int flin i riin, -----t e-- -ci----6Uu Ube cnet at A wil in V-5 relation with the motor or may be disconnected 50 from the motor while the latter continuously operates, and that the driving elements are so arranged with respect to the various pivotal axes for the cutter supporting means that the cutter chain may be driven irrespective of the adjusted 55 position thereof.

The kerf cutter 9 is mounted for pivotal movement with respect to the cutter support 8 about an axis coincident with the axis of the shaft 73, and the mounting means for the kerf cutter 60 herein comprises, as shown in Fig. 10, a hanger frame 80 having a circular bearing portion 81 journaled on a bearing sleeve 82 supported by a cylindrical hub 83 herein formed integral with the frame 74 of the cutter support. As illus65 trated, this hub 83 is hollow and surrounds the shaft 73 and provides supporting means for the bearings of this shaft. The mechanism for swinging the kerf cutter about its pivot relative to the cutter support comprises, as shown in Figs. 70 10, 11 and 12, a bevel gear 84 meshing with and driven by the bevel gear 71 of the cutter chain drive, and this bevel gear is fixed to a shaft 85 alined with the shaft 69 and arranged with its axis coincident with the pivotal axis of the 75 cutter support 8. This shaft 85 is suitably journaled in the cutter support frame 74 and drives, through a reversible ratchet and pawl mechanism generally designated 86, a shaft 87 arranged parallel with the shaft 85 and likewise suitably journaled within the cutter supporting frame. Fixed to and driven by the shaft 87 and arranged within a chamber formed in the frame 74 is a worm 88 meshing with a worm wheel 89 keyed to the circular bearing portion 81 of the hanger frame 80 for the kerf cutter. The reversible ratchet and pawl mechanism 86 comprises an eccentric 90 keyed to the projecting end of the shaft 85, and surrounding the eccentric is an eccentric strap 91 to which is rigidly secured an arm 92. This arm is pivotally connected at 93 to an oscillatory pawl carrier 94 disposed in a housing 95 suitably secured to the cutter support frame 74. Pivotally mounted on the pawl carrier are a pair of opposed pawls 96 and 96 which are normally urged by a coil spring 97 into engagement with the teeth of a ratchet wheel 98 keyed to the shaft 87. In order that the pawls 96, 96 may be selectively engaged with the ratchet wheel 98 and that their throw may be controlled, a shield 99 in the form of a segmental cylindrical shell is arranged concentrically with the ratchet wheel and surrounding the latter. It will be obvious from Fig. 12 that by properly positioning the shield, both of the pawls may be prevented from engaging the ratchet wheel, or one or the other of them may be permitted to engage the wheel a greater or lesser extent to drive selectively the worm gearing 88, 89 in either of opposite directions at variable speeds. The means for adjusting the shield into its different positions comprises a control shaft 100 keyed thereto and extending centrally through the worm shaft 87 and having fixed thereto at the end thereof opposite from the shield an operating hand wheel 101. It will thus be seen that the kerf cutter may be swung about its pivot at variable speeds in either of opposite directions.

The mechanism for rotating the turntable 4 to swing the arm frame 5, together with the cutter adjusting means, horizontally relative to the truck frame comprises a spur gear 102 (Fig. 3) keyed to the vertical shaft 51 meshing with a spur gear 103 (Fig. 4) fixed to a vertical shaft 104 herein arranged parallel with the shaft 51 and suitably journaled within the circular turntable frame 12. Secured to the shaft 104 is a worm 105 meshing with a slow speed worm wheel 106 connectible by a multiple disc clutch 107 of a usual design to a horizontal shaft 108 likewise suitably journaled within the turntable frame.

Fixed to and driven by the shaft 108 is a worm 109 meshing, as shown in Fig. 3, with a worm wheel 110 rotating about a vertical axis and suitably journaled within the turntable frame. As shown, this worm wheel drives a vertical shaft I I connectible by a clutch 112 to a spur gear i13 mounted on the shaft and meshing with the teeth of a circular rack 114 formed on the inner periphery of the annular supporting flange 15 on which the turntable is rotatably mounted. The gear 113, when released from the shaft, is freely rotatable on the shaft so when the turntable rotating means is disconnected from its drive the turntable may freely rotate about its axis with respect to the truck frame. Also meshing with the spur gear 102 is a spur gear 115 (Fig. 4) secured to a vertical shaft 116 arranged parallel with the shafts 51 and 104 and disposed on the opposite side of the shaft 51 from the shaft 104. Driven by and rotatable with the shaft 116 is a worm 117 meshing with a fast speed worm wheel 118. This worm wheel is connectible by a multiple disc clutch 119, similar to the clutch 107, to the shaft 108. It will thus be seen that when the clutch 112 is connected and one or the other of the disc clutches 107, 119 is applied, the turntable 4 may be rotated relative to the truck frame to swing the kerf cutter adjusting means horizontally about the turntable axis at either a relatively high cutter positioning speed or a relatively low cutting speed. The teeth of the worm gears 109, 110 are self-locking and lock automatically the turntable against rotation when the disc clutches are released. Now referring to the mechanism for rotating the revolving cutter head 6 about its axis with respect to the arm frame, it will be noted that fixed to the arm shaft 56 is a spur gear 122 (Fig. 3) meshing with a spur gear 123 keyed to a parallel shaft 124 suitably journaled within the circular turntable frame. Also fixed to the shaft 124 is a bevel pinion 125 meshing with reverse bevels 126 and 127 (see Fig. 15). These reverse bevels are selectively connectible by multiple disc clutches 128 and 129, respectively, to a transverse shaft 130 suitably journaled within the turntable frame. These clutches are provided with any suitable operating means including a shipper yoke 131 having an operating handle 132. Suitably secured to the shaft 130 is a worm 133 meshing with a worm wheel 134 fixed to a horizontal shaft 135 arranged parallel with the shaft 56 and likewise suitably journaled within the horizontal arm frame 5. Fixed to the forward end of the shaft 135 is a spur gear 136 (see Fig. 4) meshing with an internal gear 137 herein formed integral with the rotatable support 30 for the revolving cutter head 6. It will thus be seen that upon suitable application of the disc clutches 128, 129 the cutter head 6 may be rotated about the head axis in one direction or the other to position the kerf cutter in a plurality of intersecting planes about the neck axis. The worm gearing 133, 134 is of 43 the self-locking type and, when the clutches are released, automatically locks the cutter head against rotation about its axis, thereby retaining the kerf cutter in any of its adjusted positions about the head axis.

The mechanism for swinging the main arm or link 35 about its pivotal axis with respect to the cutter head 6, herein comprises a spur gear 139 herein formed integral with the tubular shaft 62 driven by the bevel gear 61 (see Fig. 7), and this gear meshes with a spur gear 140 in turn meshing with a spur gear 141 connectible as by a jaw clutch 142 to a transverse shaft 143 suitably journaled within the cutter head frame. Keyed to the opposite ends of the shaft 143 are worms 144, 144 meshing with worm wheels 145, 145 fixed to parallel shafts 146, 146 suitably journaled within the cutter head frame. Fixed to the shafts 146 and driven thereby are worms 147 meshing with worm gear segments 148 herein formed on the parallel frame portions 37, 37 of the main adjusting arm or link. 35. It will thus be seen that when the clutch 142 is connected the parallel arms 35, 36 may be swung about their pivotal axes with respect to the cutter head to move the kerf cutter into parallel planes toward and from and into the axial line of the head.

The worm gearing 147, 148 is self-locking, so when the clutch 142 is disconnected, the arms are automatically locked in their adjusted position. 76 The means for swinging the cutter support about its pivotal axis with respect to the main arm or link 35 comprises the secondary arm or link 36, which is herein made adjustable in length. This link 36 comprises a link portion 150 presenting a longitudinal guideway 151 in which is slidably guided a cooperating extensible link portion 152. The link portion 150 is pivotally connected to the cutter head frame, while the cooperating link portion 152 is pivotally connected to the frame 74 of the cutter support 8. It will thus be seen that the cooperating link portions have a telescopic relation, and the means for moving the link portion 152 in its guideway with respect to the cooperating portion 150 comprises a screw 154 journaled in the link portion 150 and threadedly engaging a nut 155 formed on the adjustable link portion 152. The screw 154 may be rotated in either of opposite directions to move the link portion 152 inwardly or outwardly relative to the cooperating link portion, and the means for driving the screw comprises a spur gear 151 meshing with the spur gear 140 of the arm swing driving gearing and keyed to a shaft 159 herein arranged with its axis alined with the rear pivotal axis for the secondary link and journaled in the bearings 38, 38. Connectible to the shaft 159, as by a jaw clutch 160, are reverse bevels 161 and 162 meshing with a bevel gear 163 keyed to a shaft 164 with which the screw 154 is integrally formed. It will thus be seen that the cutter support 8 may be swung through a relatively wide range about its pivo.tal axis at the outer extremity of the main arm or link 35 of the parallel motion structure to move the kerf cutter into different angularly related cutting planes, simply by adjusting the effective length of the secondary arm or link 36 to move the arms out of parallelism, and that when the arms 35, 36 are in parallel relation they may be swung to move the kerf cutter into parallel cutting planes.

Now referring to the mechanism for driving the truck wheels to propel the apparatus along the mine trackway, it will be noted that secured to the vertical shaft 51 is a worm 168 (see Fig. 3). This worm meshes with and drives in opposite directions worm wheels 169 and 1T0 (see Fig. 13).

These worm wheels constitute a reversing mechanism for the low speed truck wheel drive and are journaled on parallel longitudinally extending shafts 172 and 173, respectively, arranged at the opposite sides of the shaft 51 and are connectible to the shafts by multiple disc clutches 174, 175. Keyed to the rear ends of the shafts 172, 173, respectively, are spur gears 176 and 117 meshing with a spur gear 178 journaled on a tubular shaft 179. As shown in Fig. 3, the shaft 179 surrounds the shaft 49 and is clutched at its rearward end at 180 to a worm 181 meshing with a worm wheel 182 suitably journaled within a gear housing 183 secured to the top of the truck frame.

The worm wheel 182 is connectible, as shown in Fg. 18, by a multiple disc clutch 184 to a transverse shaft 185 suitably journaled within the gear housing. This clutch has any suitable form of operating means. Keyed to the shaft 185 is a chain sprocket 186 connected by an endless chain 187 to a chain sprocket 188 keyed to the rear truck wheel axle 189. The front and rear truck wheel axles are connected in driving relation by a chain and sprocket connection 190. Splined to the shaft 179 is a jaw clutch member 191 having clutch teeth 192 connectible to clutch teeth 193 formed on the bevel pinion 48. The clutch member 191 is operated by a shipper yoke 194 having d suitable operating handle 195. The clutch member 191 is also provided with clutch teeth 196 connectible to clutch teeth 197 formed on the spur gear 178. It will thus be seen that when the shaft 179 is connected by the clutch 191 to the bevel gear 48 the truck wheels may be driven at a relatively high speed through the worm gearing 181, 182 and the chain and sprocket connections 187, 188, 190. When the gear 178 is connected to the shaft 179 the truck wheels may be driven at a relatively low speed through the worm 168, worm wheels 169, 170, parallel shafts 172, 173, spur gears 176, 177 and in either of opposite directions under the control of the disc clutches 174, 175. The operating means for the disc clutches 174, 175 comprises a shipper yoke 200 engaging a shipper member 20 i for the clutch 174, and this yoke is fixed to a shaft 202. Secured to this shaft is a crank 203 connected by a link 204 to a crank 205 fixed to a parallel shaft 206.

Keyed to this parallel shaft is a shipper yoke 207 engaging a clutch shipper member 208 for the clutch IT5. Secured to the shaft 206 is an operating handle 209. It will thus be seen that when the handle 209 is operated in one direction one of the clutches is applied while the other is released.

In the modification shown in Fig. 19 a different construction of parallel motion arm structure is Sprovided, together with a different means for 0 swinging the arm structure and cutter support.

In this form of the invention the revolving cutter head 6, swingable cutter support 8 and kerf cutter 9, together with the rotating means for the cutter head and the driving means for the kerf cutter, 2 are similar to that disclosed in the form of the invention described above. In this instance, however, the means for swinging the main arm or link 212 is hydraulically operated and comprises a hydraulic cylinder 213 pivotally mounted at 214 on a projection 215 formed integral with the cutter head frame. Reciprocable in this cylinder is a piston 216 having its piston rod 217 pivotally connected at 218 to the main arm or link 212.

The secondary link 219 is in the form of telescopic elements for varying its effective length as in the form of the invention disclosed in Figs. 5 and 10, but in this instance the means for relatively adjusting the link elements is in the form of hydraulic means comprising a cylinder 220 pivotally connected at 221 to the cutter head frame. Reciprocable in this cylinder is a piston 222 having its piston rod 223 pivotally connected at 224 to projections 225 formed integral with the cutter support frame. Liquid under pressure is supplied through suitable pipe connections to the opposite ends of the cylinders 213, 220 from any suitable source of supply such as a pump carried by the turntable and operated by the motor 10 for pumping liquid from a suitable reservoir through the pipe connections to the cylinders. It will thus be seen that when the parts of the parallel motion means are in their parallel relation shown in Fig. 19 and liquid under pressure is supplied to the cylinder 213 the parallel motion arms may be swung relative to the cutter head to move the kerf cutter into parallel planes toward and from and into the head axis. When liquid under pressure is supplied to the cylinder 220 the effective length of the secondary link 219 may be varied to swing the cutter support 8 about its pivot relative to the motion arm in one direction or the other to move the kerf cutter into different angularly related cutting planes.

In the form of the invention shown in Fig. 20, the main arm 212, the cutter head, the cutter support and the means for swinging the main arm are the same as those disclosed in Fig. 19. In this instance, however, the secondary arm is a rigid arm 227 pivotally connected at 228 to the cutter head frame and at 229 to a frame 230 to which the outer extremity of the main link 212 is pivotally connected at 231. Pivotally mounted on the frame 230 at 232 is the cutter support 8 for the kerf cutter 9. The means for swinging the cutter support 8 about its pivot relative to the frame 230 and the parallel arm structure comprises a hydraulic cylinder 233 mounted on the frame 230 and containing a reciprocable piston 234. This piston has a rearwardly extending piston rod 235 pivotally connected at 236 to side connecting links 237, the latter in turn pivotally connected at their forward ends at 238 to projections 239 formed on the cutter support frame.

It will thus be seen that when liquid under pressure is supplied to the cylinder 233 the cutter support 8 may be swung about its pivot relative to the frame 230, while the arms 227, 213 remain stationary as regards swinging movement about their pivots. In this form of the invention the shaft 64 journaled in the main arm 212 has its bevel gear 65 meshing with a bevel gear 240 fixed to a shaft arranged with its axis coincident with the axis of the pivotal connection of the arm 212 with the frame 230. Meshing with the bevel gear 240 is a bevel gear 241 keyed to a shaft 242 journaled on the frame 230. Keyed to the outer end of this shaft is a bevel gear 243 which corresponds to the bevel gear 65 as shown in Fig. 11 and drives, through the same gearing as shown in that figure, the cutter chain. Otherwise the forms of the invention shown in Figs. 19 and 20 are similar to that disclosed in Figs. 1 to 18, inclusive.

In the modification shown in Fig. 21, the armlike frame 5 of the turntable has pivotally mounted thereon at 250 an elongated main arm or link 251 which corresponds to the main arm 35 of the first form of the invention and the main arm 212 of the modified forms of the invention shown in Figs. 19 and 20. The arm frame 5 is provided with a depending portion 252 rigid therewith, and pivotally connected at 253 to this depending portion is the secondary arm or link 254 corresponding to the secondary arm 36 and 213 of the forms of the invention above described. The outer extremities of the arms 251 and 254 are pivotally connected at 255 and 256, respectively, to a frame 257. Rotatably mounted on the frame 257 on a bearing sleeve 258 and retained thereon by a retaining ring 259 is a rotatable cutter head 260 on which the kerf cutter 9 is pivotally mounted. In this form of the invention the drive shaft 56 journaled on the arm frame 5 has keyed thereto at its forward end a bevel gear 261 meshing with a bevel gear 262, and driven thereby is a bevel gear 263 keyed to a shaft 264 extending lengthwise of and suitably journaled within the main arm 251. Keyed to the forward end of the shaft 264 is a bevel gear 265 meshing with a bevel gear 266 journaled on the hinge shaft 255. This bevel gear meshes with and drives a bevel gear 267 keyed to a shaft 268 arranged with its axis coincident with the cutter head axis and suitably journaled within the frame 257 and the cutter head frame. Keyed to the outer end of the shaft 268 is a bevel gear 269 meshing with a bevel gear 270 keyed to a shaft 271 to which the chain sprocket 75 is secured for driving the chain of the kerf cutter. The secondary arm or link 254 is in the form of a cylinder 272 containing a reciprocable piston having a piston rod 273, and is similar in design to the cylinder and piston 213, 216 of the form of the invention shown in Fig. 19.

The means for rotating the cutter head 260 comprises a worm 274 journaled on the frame 257 and meshing with a worm wheel 215 secured to the cutter head frame. The worm 274 is driven from the bevel gear 266 through a variable speed ratchet mechanism similar to that shown in Fig. 12. The kerf cutter 9 is mounted on a hanger 276 having a circular bearing portion 277 journaled on a bearing sleeve supported on a cylindrical support 278 formed integral with the cutter head frame. Carried by the cutter head is a locking pin 279 engageable with locking recesses 280 formed on a flange integral with the circular bearing portion 277, and this locking pin is adapted to lock the kerf cutter in its different angular positions with respect to the cutter head. The parallel arms 251, 254 are swung about their pivots by means of hydraulic cylinders and pistons similar to that shown in Fig. 19 and comprising cylinders 281 each containing a reciprocable piston 282. These cylinders are arranged in parallel relation and straddle the arm cylinder 272. It will thus be seen that when the arms 251, 254 are swung simultaneously about their pivots the altitude of the head axis is varied while the head axis always remains parallel to a horizontal plane. By changing the effective length of the secondary arm 254 by reciprocating its piston relative to its cylinder, the frame 257 may be swung about its pivotal connection with the main arm 251 to change the angle in altitude of the head axis. When the cutter head is rotated about its axis with the kerf cutter 9 in vertical shearing position, the kerf cutter may be swung in an upright arcuate path by swinging the parallel arms simultaneously about their pivots. The kerf cutter may be swung horizontally by swinging the turntable and arm frame about the turntable axis.

The mode of operation of the improved mining apparatus is as follows: The apparatus may be propelled along the mine trackway at a high transport speed by the motor 10 through the concentric shafts 49 and 179, the worm gearing 181, 182, disc clutch 184 and the chain and sprocket connection 186, 187, 188 and 190. To effect reversal of the high speed drive, the motor 10 must be reversed. The turntable and arm structure may be swung horizontally from left to right as viewed in Fig. 1 relative to the truck to move the kerf cutter in horizontal planes at a relatively high positioning speed across the end of the truck by applying the fast speed clutch 119 of the turntable rotation means. The turntable and arm structure may be swung from right to left as viewed in Fig. 1 to swing the kerf cutter in horizontal planes at a relatively low cutting speed by applying the low speed clutch 107 of the turntable rotation mechanism. The parallel arms or links 35, 36 may be swung vertically relative to the revolving head 6 and turntable by connecting the clutch 142 with the arm swinging mechanism to move the kerf cutter through a series of horizontal cutting planes toward and from and into the head axis. By shortening or increasing the effective length of the secondary arm or link 36 the cutter support 8 may be swung about its pivotal connection with the main arm 35 to move the kerf cutter into different angularly related cutting planes with respect to the horizontal. The kerf cutter may 76 be swung about its pivot relative to the cutter support 8 by operating the hand wheel IOf to adjust the shield 99, thereby to bring one or the other of the pawls 96, 96 into engagement with the ratchet wheel. By suitable adjustment of the shield 99 the kerf cutter may be swung about its pivot in either of opposite directions through a wide range of cutting speeds. The kerf cutter may be adjusted into a vertical shearing position, as indicated in dotted lines in Fig. 1, by rotating the revolving head 6 by application of one or the other of the reverse clutches 128, 129 of the head rotating mechanism. The kerf cutter may be adjusted into a top cutting position, as indicated by the upper dotted line position in Fig. 2, by revolving the head 6 to bring the kerf cutter into the position shown. The kerf cutter may be lowered into a bottom cutting position, as indicated by the lower dotted line position in Fig. 2, to cut a horizontal kerf at the level of the mine floor outside and below the level of the mine trackway and in advance of the trackway. In the forms of the invention shown in Figs. 19 and 20, the kerf cutter adjusting mechanism operates in a manner substantially the same as that above described. In the form shown in Fig. 21 the parallel arms or links are utilized as a swinging means to effect swinging of the kerf cutter during its vertical cutting function, while the turntable and arm structure are employed for effecting horizontal swinging of the kerf cutter. In the modification shown in Fig. 20 the cutter support is swung relative to the arms, the latter in this case being rigid and of a fixed length while in the other forms of the invention one of the parallel arms is shortened or lengthened to effect tilting of the cutter support. As the methods of operating a mining apparatus of the character disclosed to effect its various cutting functions in accordance with the arcwall method of mining and in making longwall and slabbing cuts are well known to those skilled in the art, a detailed description of the general mode of operation of the machine herein is considered unnecessary.

As a result of this invention, it will be noted that an improved mining apparatus is provided having improved adjusting mechanism for the kerf cutter, the adjusting mechanism being of an extremely flexible nature whereby a mining apparatus having relatively great universality is obtained, it being possible to adjust the kerf cutter to cut horizontal kerfs at any desired location between the mine roof and mine floor and vertical kerfs at any desired location between the ribs and in the ribs. It will further be noted that an improved parallel motion supporting and adjusting structure is provided for the kerf cutter whereby the kerf cutter may be moved into parallel cutting planes at any desired level and may be tilted to change its angle in altitude with respect to such planes by shortening or lengthening one of the elements of the parallel motion structure. These and other uses and advantages of the improved mining apparatus will be clearly apparent to those skilled in the art.

While there are in this application specifically described one form and several modifications which the invention may assume in practice, it will be understood that this form and modifications of the same are shown for purposes of illustration and that the invention may be further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: 1. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble cutter head mounted on said turntable to rotate relative thereto about a horizontal axis, a parallel arm structure including a pair of parallel arms pivotally mounted on said head to swing relative thereto about parallel axes, a cutter support pivotally mounted on the outer extremity of said parallel arm structure to swing about an axis parallel with the pivotal axes of the arm structure, a kerf cutter carried by said cutter support, said cutter support being swingable through a relatively wide range relative to said arm structure, upon its pivotal mounting upon the latter, to move said kerf cutter into angularly related cutting planes to cut at opposite sides of a longitudinal plane including the cutter support pivot axis, and motor operated means mounted on said base for driving said kerf cutter and for swinging said cutter support about its pivot relative to said arm structure.

2. In a mining apparatus, a kerf cutter, and an adjustable parallel motion arm structure including parallel arms for moving said kerf cutter automatically through a series of parallel cutting planes, one of said arms being adjustable in length, and means for adjusting said arm to change the effective length thereof to swing said kerf cutter into different angularly related cutting planes with respect to said other arm.

3. In a mining apparatus, a revolving cutter head, parallel arms pivotally mounted on said head to swing relative thereto, a cutter support carried at the outer extremities of said arms and to which the latter are pivotally connected, a kerf cutter carried by said cutter support, and means for changing the effective length of one of said arms between its pivotal connections with said head and cutter support to move said arms out of parallelism to swing the cutter support about its pivotal connection with said other arm.

4. In a mining apparatus, a parallel arm supporting structure, a cutter support carried by the parallel arms thereof, a kerf cutter carried by said cutter support, means for swinging said arms automatically to move said kerf cutter through a series of parallel cutting planes, and means for swinging said cutter support through a relatively wide range relative to said arms to move said kerf cutter into different angularly related cutting planes each perpendicular to the plane of arm swing and respectively at substantial angles with respect to said parallel planes to cut at opposite sides of any plane of the latter in any position of the kerf cutter.

5. In a mining apparatus, a portable base, a parallel motion structure pivotally mounted on said base including parallel arms, a cutter support mounted on the outer extremities of said paral6lel arms, a kerf cutter carried by said cutter support, means for swinging said parallel arms automatically to move said kerf cutter through a series of parallel cutting planes, and means for swinging said cutter support through a relatively wide range relative to said parallel arms to move the kerf cutter into different angularly related cutting planes perpendicular to the planes of parallel arm swing and making with each other and with said parallel planes dihedral angles of substantial angular magnitude.

6. In a mining apparatus, a portable base, a horizontal turntable on said base, a revolving head mounted on said turntable, parallel arms pivotally mounted on said head to swing relative thereto, a cutter support mounted at the outer extremities of said parallel arms to swing relative thereto, a kerf cutter carried by said cutter support, said cutter support being swingable selectively in either of opposite directions through a relatively wide range relative to said arms to move said kerf cutter into angularly related cutting planes perpendicular to the planes of parallel arm swing and making with each other dihedral angles of substantial angular magnitude, means for swinging said parallel arms automatically to move said kerf cutter through a series of parallel cutting planes while said cutter support remains in a position to maintain said kerf cutter substantially horizontal, and means for moving said parallel arms out of parallelism to swing said cutter support about its pivotal connection with one of said arms to move said kerf cutter as aforesaid into angularly related cutting planes with respect to the horizontal. 7. In a mining apparatus, a portable base, a horizontal turntable on said base, a revolving head mounted on said turntable tol rotate about a horizontal axis, an arm structure pivotally mounted on said head to swing relative thereto, a cutter support pivotally connected to the outer extremity of said arm structure to swing about an axis parallel with the arm structure pivot axis, a kerf cutter carried by said cutter support, said cutter support being swingable about said parallel axis through a relatively wide range relative to said arm structure to move said kerf cutter into angularly related cutting planes at substantial angles at opposite sides of a horizon-' tal plane including the cutter support pivot axis, motor driven means for swinging said arm structure relative to said revolving head, motor driven means for driving said kerf cutter, and motor driven reversible means for swinging said cutter support selectively in either of opposite directions relative to said arm structure while the latter remains stationary to move said kerf cutter into aforesaid angularly related cutting planes without reversing the direction of drive of said kerf cutter driving means. 8. In a mining apparatus, a kerf cutter, a parallel motion supporting and adjusting structure therefor including parallel arms, one of said arms comprising cooperating relatively adjustable arm elements for varying the length of said arm, means for swinging said parallel arms automatically to move the kerf cutter through a series of parallel cutting planes, and means for relatively adjusting the elements of said variablelength arm to vary the length thereof to move the kerf cutter into different angularly related cutting planes with respect to said other arm.

9. In a mining apparatus, a kerf cutter, a parallel motion supporting and adjusting structure therefor including parallel arms, one of said arms comprising cooperating relatively adjustable arm elements for varying the length of said arm, means for swinging said parallel arms automatically to move the kerf cutter through a series of parallel cutting planes, and means for o5 relatively adjusting the elements of said variable-length arm to, vary the. length thereof to move the kerf cutter into different angularly related cutting planes with respect to said other arm, said variable-length arm being adjustable in length toi swing the kerf cutter about its: pivotal connection with said other arm.

10. In a mining apparatus, a kerf cutter, swingable, relatively movable, parallel arms for supporting said kerf cutter, one of said arms com-prising telescopically arranged elements, and means for adjusting said elements to vary the effective length of said arm to swing said kerf cutter relative to said other arm.

11. In a mining apparatus, a kerf cutter, swingable, relatively movable, parallel supporting arms therefor, one of said arms comprising hydraulic cylinder and piston elements, and means for relatively reciprocating said cylinder and piston elements to vary the effective length of said arm to swing said kerf cutter into relatively inclined cutting planes relative to said other arm.

12. In a mining apparatus, a parallel motion supporting and adjusting structure, a frame carried by said structure and to which the latter is pivotally connected on parallel axes, a cutter support pivotally mounted on said frame to swing relative thereto about a parallel axis offset from the axes of pivotal connection of said arm structure with said frame, a kerf cutter carried by said cutter support, and means for swinging said arms and for swinging said cutter support relative to said frame.

13. In a mining apparatus, a portable base, a horizontal turntable on said base, a parallel arm structure pivotally mounted on said turntable to swing relative thereto, a cutter support carried at the outer extremity of said arm structure to swing relative thereto about parallel axes, a kerf cutter pivotally mounted on said cutter support to swing relative thereto, a motor on said base. means driven by said motor for swinging said arm structure, and means driven by said motor for swinging said cutter support relative to said arm structure about said parallel axes and said kerf cutter about its pivot relative to said cutter support.

14. In a mining apparatus, a portable base, a horizontal turntable on said base, a parallel arm structure pivotally mounted on said turntable to swing relative thereto' about parallel axes, a cutter support carried at the outer extremfity of said arm structure to swing relative thereto about an axis parallel with the arm structure pivot axes, Sa kerf cutter pivotally mounted on said cutter support to swing relative thereto, a motor on said base, means driven by said motor for swinging said arm structure, and means driven by said motor for independently swinging said cutter support relative to said arm structure about said axis parallel with the arm structure pivot axes and for swinging said kerf cutter about its pivot relative to said cutter support.

15. In a mining apparatus, a portable base, a horizontal turntable on said base, a horizontal arm rigid with said turntable and overlying said base, said arm-at its outer extremity overhanging said base, a revoluble cutter head mounted on the outer overhanging extremity of said arm in advance of said base, parallel arms pivotally mounted on said cutter head to swing relative thereto about parallel axes, a cutter support carried at the outer extremities of said parallel arms to swing relative thereto about an axis parallel with the arm pivot axes, a kerf cutter carried by said cutter support, a motor on said base, and means driven by said motor for rotating said turntable, for rotating said head, for swinging said arms relative to said head and for swinging said cutter support relative to said swingable arms upon said axis parallel with the arm pivot axes, said cutter support being swingable as specified by said motor driven means through a relatively wide range relative to said swingable arms 5 while the latter remain stationary as regards swinging movement to move the kerf cutter into different angularly related cutting planes relative to said swingable arms.

16. In a mining apparatus, a revoluble cutter head, a parallel motion arm structure including parallel arms pivotally mounted on said head to swing relative thereto, a kerf cutter carried by said arm structure, hydraulically operated means for swinging said arm structure automatically to move the kerf cutter through a series of parallel cutting planes, and hydraulically operated means for moving said arms out of parallelism to tilt the kerf cutter through a relatively wide range of angularly related cutting planes at substantial angles with respect to said parallel planes. 17. In a mining apparatus, parallel motion arms swingable about parallel spaced apart axes, a frame carried by said arms and to which the latter are pivotally connected, a cutter support pivotally mounted on said frame, a kerf cutter swingably mounted on said cutter support, hydraulically operated means for swinging said arms about their pivots automatically to move said kerf cutter through a series of parallel cutting planes, and hydraulically operated means for independently swinging said cutter support about its pivot relative to said frame.

18. In a mining apparatus, a portable base, a turntable on said base, parallel arms pivotally mounted on said turntable to swing relative thereto, a cutter support pivotally mounted on the outer extremities of said arms to swing relative thereto about an axis parallel with the arm pivot axes, a kerf cutter pivotally mounted on said cutter support to swing relative thereto, a motor on said base, and means driven by said motor for swinging said arms, for independently swinging said cutter support relative to said arms upon said axis parallel with the arm pivot axes, and for swinging said kerf cutter about its pivot relative to said cutter support.

19. In a mining apparatus, a portable base, a parallel motion arm structure including parallel arms pivotally mounted on said base to swing relative thereto, a cutter support carried at the outer extremities of the arms of said arm structure, a kerf cutter carried by said cutter support, a motor for driving said kerf cutter, means driven by said motor for swinging said parallel arms automatically to move the kerf cutter through a series of parallel cutting planes, and means driven by said motor for moving said arms out of parallelism to tilt said cutter support relative thereto to move the kerf cutter into different angularly related cutting planes. 20. In a mining apparatus, a portable base, a parallel motion arm structure including parallel arms pivotally mounted on said base to swing relative thereto, a cutter support carried at the outer extremities of the arms of said arm structure, a kerf cutter carried by said cutter support, a motor for driving said kerf cutter, means driven by said motor for swinging said parallel arms automatically to move the kerf cutter through a series of parallel cutting planes, and means driv- s6 en by said motor for moving said arms out of parallelism by varying the effective length of one of the latter to tilt said cutter support relative thereto to move the kerf cutter into different angularly related cutting planes. 21. In a mining apparatus, a parallel motion supporting and adjusting structure including parallel motion arms swingable about parallel axes arranged in relatively fixed relation, a cutter head mounted on the outer extremities of said arms to rotate relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head to swing relative thereto, means for swinging said parallel arms automatically to move the cutter head into different cutting positions while the head axis always remains parallel to a common straight line, and means for moving said arms out of parallelism while their pivotal axes remain relatively fixed as regards spacial relation to effect tilting of the head axis with respect to said straight line.

22. In a mining apparatus, a parallel motion supporting and adjusting structure including parallel motion arms swingable about parallel axes arranged in relatively fixed relation, a cutter head mounted on the outer extremities of said arms to rotate relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head to swing relative thereto, means for swinging said parallel arms automatically to move the cutter head into, different cutting positions while the head axis always remains parallel to a common straight line, and means for moving said arms out of parallelism while their pivotal axes remain relatively fixed as regards spacial relation by changing the effective length of one of said arms to effect tilting of the head axis with respect to said straight line.

23. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble cutter head mounted on said turntable to rotate relative thereto about a horizontal axis, a parallel arm structure pivotally mounted on said head to swing relative thereto about parallel axes, a cutter support pivotally mounted on the outer extremity of said arm structure to swing relative thereto about an axis parallel with the pivotal axes of the arm structure, a kerf cutter carried by said cutter support, said cutter support being swingable about its said axis through a relatively wide range relative to said arm structure while the latter remains stationary as regards swinginig movement about its pivotal axes to move said kerf cutter into angularly related cutting planes, and a motor on said base for driving said kerf cutterr and for swinging said cutter support as aforesaid about its pivot relative to said arm structure.

24. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble cutter head mounted on said turntable to rotate relative thereto about a horizontal axis, a parallel arm structure pivotally mounted on said head to swing relative thereto about parallel axes, a cutter support pivotally mounted on the outer extremity of said arm structure to swing relative thereto about an axis parallel with the pivotal axes of the arm structure, a kerf cutter carried by said cutter support, said cutter support being swingable about its said axis through a very substantial angle relative to said arm structure to move said kerf cutter through a wide range of angularly related cutting planes, and a motor on said base for driving said kerf cutter and for swinging said cutter support as aforesaid about its pivot relative to said arm structure.

25. In a mining apparatus, a parallel arm supporting structure, a cutter support carried by the parallel arms thereof, a kerf cutter carried by said 70 cutter support, means for swinging said arms automatically to move said kerf cutter through a series of parallel cutting planes, and motor operated, reversible means for swinging said cutter support selectively in opposite directions through a relatively wide range relative to said arms to move said kerf cutter into angularly related cutting planes perpendicular to the planes of arm swing and at substantial angles in opposite directions with respect to a plane parallel with said parallel planes. 26. In a mining apparatus, a portable base, a parallel motion structure pivotally mounted on said base including parallel arms mounted to swing about parallel axes, a kerf cutter support mounted on the outer extremities of said parallel arms to swing selectively in opposite directions through a relatively wide range relative thereto while the latter remain stationary as regards swinging movement about their pivotal axes to move the kerf cutter into angularly related cutting planes each of which is perpendicular to the planes of arm swing, and motor operated, reversible means for swinging said arms selectively in opposite directions about their pivots and for swinging said cutter support as aforesaid about its pivot relative to said arms.

27. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble head mounted on said turntable to rotate about a horizontal axis, a parallel arm structure pivotally mounted on said head to swing relative thereto about parallel axes, a cutter support pivotally connected to the outer extremity of said arm structure to swing relative thereto about an axis parallel with the arm structure axes, a kerf cutter carried by said cutter support, said cutter support being swingable about its said axis through a relatively wide range relative to said arm structure while the latter remains stationary as regards swinging movement to move said kerf cutter into angularly related cutting planes, a motor on said base, means driven by said motor for swinging said arm structure relative to said head, and means driven by said motor for swinging said cutter support as aforesaid relative to said arm structure. 28. In a mining apparatus, a kerf cutter, a parallel motion supporting and adjusting structure including parallel arms, each of said arms being pivotally mounted at its rear end and pivotally connected at its forward end to the kerf cutter, one of said arms being adjustable in length between its end pivots, means for swinging said parallel arms automatically to move said kerf cutter through a series of parallel cutting planes, and means for adjusting said adjustable arm be- 650 tween its end pivots to vary the length thereof to tilt the kerf cutter into angularly related cutting planes with respect to said other arm.

29. In a mining apparatus, a kerf cutter, a parallel motion supporting and adjusting structure including parallel arms, each of said arms being pivotally mounted at its rear end and pivotally connected at its forward end to the kerf cutter, one of said arms being adjustable in length between its end pivots, means for swinging said parallel arms automatically to move said kerf cutter through a series of parallel cutting planes, and means for adjusting said adjustable arm between its end pivots to vary the length thereof to move the kerf cutter into angularly related cutting planes with respect to said other arm, said adjustable-length arm being adjustable in length to swing the kerf cutter about its pivotal connection with said other arm to move the kerf cutter into relatively inclined cutting planes at substantial angles with respect to a plane parallel with said parallel cutting planes.

30. In a mining apparatus, a kerf cutter, swingable, relatively movable, parallelarmsforsupporting said kerf cutter, one of said arms comprising relatively adjustable arm elements, one element slidably guided on the other element, and means for adjusting the arm elements of said adjustable arm to vary the length of said arm to swing said kerf cutter through a substantial angle relative to said other arm.

31. In a mining apparatus, a parallel motion supporting and adjusting structure including parallel motion arms swingable about parallel spaced apart axes, a cutter head mounted on the outer extremities of said arms to rotate relative thereto about a horizontal axis, one of said arms being adjustable in length between its pivot of i5 swing and its connection with said head, a kerf cutter supported on said cutter head, means for swinging said parallel arms about their pivots automatically to move the cutter head into different cutting positions while the head axis always remains parallel to a common straight line, and means for adjusting the length of said adjustable arm to move said arms out of parallelism to effect tilting of said head axis through a substantial angle with respect to said straight line. 32. In a mining apparatus, a parallel motion supporting and adjusting structure including parallel motion arms swingable about parallel spaced apart axes, a cutter head mounted on the outer extremities of said arms to rotate relative thereto about a horizontal axis, one of said arms being adjustable in length between its pivot of swing and its connection with said head, a kerf cutter supported by said cutter head, means for swinging said parallel arms about their pivots automatically to move the cutter head into different cutting positions while the head axis always remains parallel to a common straight line, and means for adjusting the length of said adjustable arm by shortening or lengthening of the latter to move said arms out of parallelism to effect tilting of the head axis with respect to said straight line to bring said kerf cutter into cutting planes at substantial angles at opposite sides of a line parallel to said straight line.

33. In a mining apparatus, a portable base, a parallel motion structure adjustably mounted on said base, a cutter support pivotally mounted on the outer extremity of said parallel motion structure to swing relative thereto, a kerf cutter carried by said cutter support, said parallel motion structure upon adjustment thereof relative to said base always automatically maintaining said kerf cutter parallel to a common straight line, and means for swinging said cutter support about its pivot relative to said parallel motion structure while the latter remains stationary as regards adjustment thereof relative to said base to move the kerf cutter through a wide range of angularly related cutting planes perpendicular to the planes of adjustment of said parallel motion structure with respect to said common straight line.

34. In a mining apparatus, a portable base, a parallel motion structure adjustably mounted on said base, a cutter support pivotally mounted on the outer extremity of said parallel motion structure, to swing relative thereto, a kerf cutter carried by said cutter support, said parallel motion structure upon adjustment thereof relative to said base always automatically maintaining said kerf cutter parallel to a common straight line, and means for swinging said cutter support about its pivot relative to said parallel motion structure while the latter remains stationary as regards adjustment thereof relative to said base to move the kerf cutter through a wide range of angularly related cutting planes perpendicular to the planes of adjustment of said parallel motion structure to cut at opposite sides of a longitudinal plane including the support pivot axis.

35. In a mining apparatus, a portable base, parallel arms pivotally connected to said base to swing relative thereto about relatively fixed parallel axes, a cutter support at the outer extremity of said arms, said arms being pivotally connected to said cutter support about relatively fixed parallel axes parallel with said arm pivot axes, a kerf cutter carried by said cutter support, means for swinging said arms relative to said base automatically to move said kerf cutter into parallel cutting planes, and means for varying the effective length of one of said arms while the pivotal connections of said arms with respect to said base and cutter support remain relatively fixed as aforesaid for tilting said cutter support about its pivotal connection with said other arm to move the kerf cutter into relatively inclined cutting planes.

36. In a mining apparatus, a portable base, parallel arms pivotally connected to said base to swing relative thereto about relatively fixed parallel axes, a cutter support at the outer extremity of said arms, said arms being pivotally connected to said cutter support about relatively fixed parallel axes parallel with said arm pivot axes, a kerf cutter carried by said cutter support, means for swinging said arms relative to said base automatically to move said kerf cutter into parallel cutting planes, and means for varying the effective length of one of said arms while the. pivotal connections of said arms with respect to said base and cutter support remain relatively fixed as aforesaid for tilting said cutter support about its pivotal connection with said other arm to move the kerf cutter into relatively inclined cutting planes, said variable-length arm having relatively adjustable portions for varying the distance between its pivotal connections with said base and cutter support.

37. In a mining apparatus, a portable base, a horizontal turntable onsaidbase, ahead mounted on said turntable to rotate about a horizontal axis, an arm pivotally mounted on said head to swing relatively thereto, a cutter support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said support, motor operated means for swinging said cutter support about its pivotal connection with said arm while the latter remains stationary, and motor operated means for swinging said kerf cutter about its pivot relative to said cutter support and including a driving element coaxial with the cutter support pivot and cutter swinging connections driven by said driving element including a driven element secured to said kerf cutter, said driven element arranged coaxial with the kerf cutter pivot and arranged between said cutter support pivot and said kerf cutter.

38. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble cutter head mounted on said turntable to rotate relative thereto about a horizontal axis, a parallel arm structure pivotally mounted on said head to swing relative thereto about parallel axes, a cutter support pivotally mounted on the outer extremity of said arm structure to: swing relative. thereto about an axis parallel with the pivotal axes of said arm structure, a kerf cutter carried. by said cutter support, a motor on said base for driving said kerf cutter, and means driven b3 said motor for independently swinging said arm structure and cutter support about their respective pivots.

39. In a mining apparatus, a portable base, a horizontal turntable on said base, a revoluble support mounted on said turntable to. rotate relative thereto about a horizontal axis, parallel arms pivotally mounted on said revoluble support to swing relative thereto about relatively fixed parallel axes, a cutter support carried at the outer extremities of said parallel arms to swing relative thereto about an axis parallel with the arm pivot axes while said arm pivot axes remain relatively fixed, a kerf cutter carried by said cutter support, a motor for driving said kerf cutter, and means driven by said motor for independently swinging said arms and cutter support about their respective pivotal axes. 40. In a mining apparatus, a kerf cutter, and an adjustable parallel motion structure including parallel arms for moving the kerf cutter automatically through a series of parallel cutting planes while the kerf cutter at all times remains parallel to a common straight line extending longitudinally of said apparatus and embodying means for tilting said kerf cutter into a cutting plane at right angles to a plane parallel with said parallel planes and perpendicular to said go common straight line.

41. In a mining apparatus, a kerf cutter, an adjustable parallel motion structure including parallel arms for moving the kerf cutter automatically through a series of parallel cutting planes while the kerf cutter at all times remains parallel to a common straight line extending longitudinally of the apparatus and embodying means for tilting said kerf cutter into a cutting plane perpendicular to the planes of adjusting movement of said parallel arms and at an angle 4of at least 450 with respect to a plane parallel with said parallel planes.

42. In a mining apparatus, a kerf cutter, an adjustable parallel motion structure including parallel arms for moving the kerf cutter auto45 matically through a series of parallel cutting planes while the kerf cutter at all times remains parallel to a common straight line extending longitudinally of the apparatus and embodying means for tilting said kerf cutter into a cutting 50 plane making angles of substantially 900 respectively with a plane parallel with said parallel planes and with the planes of adjusting motion of said parallel arms.

43. In a mining apparatus, a portable base, a 55 head mounted on said base to revolve about a horizontal axis, a kerf cutter, and an adjustable cutter supporting structure intervening said head and kerf cutter for moving said kerf cutter into different cutting planes and embodying a selec60 tively extensible or contractible cutter adjusting arm.

44. In a. mining apparatus, a portable base, parallel arms pivotally mounted on said base to swing relative thereto about parallel axes, a cut65 ter support pivotally mounted on the outer extremity of one of said arms to swing relative thereto, said other arm being pivotally connected to said cutter support and extensible in length to swing said cutter support about its pivotal 70 connection with said other arm, and a kerf cutter carried by said cutter support.

45. In a mining apparatus, a portable base, a kerf cutter, and an adjustable parallel motion arm structure including parallel arms for mov75 ing said kerf cutter through a series of parallel Scutting planes, one of said arms being extensible L in length, and means for extending said arm to Sswing said kerf cutter into angularly related cutting planes with respect to said other arm.

46. In a mining apparatus, a horizontal kerf cutter, and a parallel arm, parallel motion adjusting and supporting structure for said kerf cutter for moving said kerf cutter through a wide range of parallel horizontal cutting planes, said structure embodying means for tilting said kerf cutter through a wide range of angularly related cutting planes at substantial angles with respect to said parallel horizontal planes and perpendicular to the planes of parallel arm adjusting movement. 47. In a mining apparatus, a horizontal kerf cutter, and a parallel arm, parallel motion adjusting and supporting structure for said kerf cutter for moving said kerf cutter through a wide range of parallel horizontal cutting planes, said structure embodying means for tilting said kerf cutter through a wide range of angularly related cutting planes at substantial angles with respect to said parallel horizontal planes, said tilting means including means for tilting said kerf cutter into a vertical cutting plane at right angles to a plane parallel with said horizontal planes and also at right angles to the planes of parallel arm adjusting movement.

48. In a mining apparatus, a horizontal kerf cutter, and a parallel arm, parallel motion adjusting and supporting structure for said kerf cutter for moving said kerf cutter through a wide range of parallel horizontal cutting planes, said structure embodying means for tilting said kerf cutter into a cutting plane at an angle of at least 450 with respect to a plane parallel with said parallel horizontal planes and also at substantially right angles to the planes of parallel arm adjusting movement. 49. In a mining apparatus, a horizontal kerf cutter, and a parallel arm, parallel motion adjusting and supporting structure for said kerf cutter for moving said kerf cutter through a wide range of parallel horizontal cutting planes, said structure embodying means for tilting said kerf cutter into a cutting plane at an angle of substantially 900 with respect to a plane parallel with said parallel horizontal planes and also at an angle of substantially 900 with the planes of parallel arm adjusting movement.

50. In a mining apparatus, a parallel arm supporting structure including parallel arms swingable about parallel axes, a cutter support carried by the parallel arms of said supporting structure, a kerf cutter carried by said cutter support, means for swinging said arms automatically to move said kerf cutter through a series of parallel cutting planes, and means for swinging said cutter support through an angle of at least 45° relative to said arms to move said kerf cutter into different angularly related cutting planes perpendicular to the planes of arm swing and at substantial angles with respect to said parallel planes. 51. In a mining apparatus, an arm structure, a cutter support tiltably mounted thereon about an axis arranged at right angles to the longitudinal axis of said arm structure, a kerf cutter pivotally mounted on said cutter support to swing relative thereto about an axis perpendicular to said cutter support axis, and motor operated means for swinging said kerf cutter about its pivot relative to said cutter support including a driving element coaxial with the cutter support pivot, a driven element arranged between said support pivot and said kerf cutter and secured to the latter, and driving means between said driving and driven elements.

52. In a mining apparatus, an arm structure, a cutter support tiltably mounted thereon about an axis arranged at right angles to the longitudinal axis of said arm structure, a kerf cutter pivotally mounted on said cutter support to swing relative thereto about an axis perpendicular to said cutter support axis, and motor operated means for swinging said kerf cutter about its pivot relative to said cutter support including a driving element coaxial with the cutter support pivot, a driven element arranged between said support pivot and said kerf cutter and secured to the latter, and driving means between said driving and driven elements including an automatic intermittent grip transmission means.

53. In a mining apparatus, a portable base, a head mounted on said base to revolve about a horizontal axis, a kerf cutter, and an adjustable cutter supporting structure intervening said head and kerf cutter for moving said kerf cutter into different cutting planes and embodying an extensible cutter adjusting arm, and means for swinging said kerf cutter in its cutting planes while said cutter supporting structure remains relatively stationary.