Title:
Gun
United States Patent 2379784


Abstract:
This invention relates to ordnance and more particularly to guns for discharging explosive projectiles. The usefulness. of the grenade, or small bomb, in present day warfare is of course, well known. It is usually thrown by hand and is used at short range to blast targets located in trenches....



Inventors:
Samuel, Brand
Application Number:
US47493643A
Publication Date:
07/03/1945
Filing Date:
02/06/1943
Assignee:
IBM
Primary Class:
Other Classes:
102/274, 124/51.1, 124/78
International Classes:
F41A9/30; F41B4/00; F42C1/04; F42C15/20
View Patent Images:



Description:

This invention relates to ordnance and more particularly to guns for discharging explosive projectiles.

The usefulness. of the grenade, or small bomb, in present day warfare is of course, well known.

It is usually thrown by hand and is used at short range to blast targets located in trenches. and behind fortifications, pill boxes,, machine gun nests, tanks, trucks, houses, and the like.

However, they are decidedly limited in their use and effectiveness; because, as they are thrown by hand, the accuracy and range is limited. to the: skill and ability of the particular soldier using them. Furthermore, they are dangerous to: use because the soldiers throwing them necessarily have to approach relatively close to the target, This invention has: for a general object to provide a new and improved form of gun which discharges projectiles of the same general type as the hand grenade; i. e., high explosive bombs and. chemical and incendiary bombs, and to provide a gun which can be used for the same purposes; as the: hand grenades- are now-used, and which is decidedly, more accurate, has a much longer range, and- is safer to use than the hand grenade.

A further object is to provide a gun of the above type which is of improved construction and arrangement of parts and which:, mechanically discharges. the projectiles with a, relatively high degree of accuracy.

A further object of this invention is to provide: a short range portable gun which is simple and rugged in construction and which is relatively safe to operate.

A still further object is to. provide a gun for mechanically, discharging projectiles successively. at a righ rate.

According to one aspect of the present invention, my improved gun comprises a frame structure having a wide range of adjustment both for elevation and for traverse, a barrel carried, by the frame, and a mechanically driven mechanism including a plurality of friction rollers arranged on opposite sides of said barrel and operable to engage a projectile as it is fed into; the breech and to propel: such projectile along the bore and discharge the same out through the muzzle.

Other objects of the invention will be pointed out in the following description and claims: and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best; mode, which: has. been contemplated, of applying that principle.

In: the drawings: Fig. 1 is a side elevation showing one preferred embodiment of gun constructed in accordance with the present invention, the gun being shown as adjusted, to fire at a relatively high elevation; Fig; 2. is a rear elevation of the gun shown in Fig.. 1 and illustrating the gun as adjusted to fire at. the minimum elevation for which the particular gun shown is designed; Fig. 3 is an, enlarged fragmentary vertical seetional view taken on the line 3-3 of Fig. 2 and illustrating the gun in the same adjustment for elevation as Fig. 1;.

Fig. 4' is a longitudinal section taken on the line 4-4 of Fig. 3; Fig. 5 is a longitudinal section taken on the line 5-5 of Fig. 3; Fig. 6 is a transverse sectional view taken on the line 6-6 of. Fig. 3;, Fig. 7 is a fragmentary vertical sectional view taken on the line 7-7 of Fig, 4; Fig. 8 is an enlarged fragmentary sectional view. taken on, the line 8-8 of Fig. 3; Fig. 9 is afragmentary transversesection taken on the line 9-9 of Fig. 3; Fig. 10. is. an enlarged fragmentary plan section taken on the line. 10--10 of Fig. 3 and illustrating one preferred means for holding the gun in any desired position of adjustment for horizontal traverse; Fig. 11 is an enlarged detail fragmentary section, taken on the line 1 I-11 of Fig. 2 and illustrating one preferred means for controlling the feeding of projectiles into firing position; Fig. 12 is. an enlarged detail fragmentary section taken on the line 12--12 of Fig.2. and illustrating one preferred, means' for adjusting thegun, for elevation; Fig. 13. is a& fragmentary plan section illustrating the means for driving the. sprockets which feed the projectiles: into position to enter the breech of the gun barrel, the suction being taken on the line, 13-13 of Fig. 3,; Fig. 14 is a partial side elevation and partial longitudinal section, showing one form of projectile which may be used in the, gun disclosed;. and: Fig. 15 is a rear elevation of the, projectile: shown; in Fig, 14.

Referring'to the construction illustrated in Figs. L to: 13, inclusive, the reference: numeral 10 indicates,, in its; entirety; one preferred embodiment of a gun constructed in accordance with the present-inventionm In.general, the gun: 10 comprises a frame- structure I1I and a gun barrel 12 mounted) in'the frame structure. The:frame structure may be considered as comprising a base or pedestal support 13, an upper or barrel-carrying frame part 14, and an intermediate or connector frame member 15.

The pedestal support 13 is shown as comprising a centrally located body part 16 and three legs 17 extending downwardly and outwardly therefrom; and the body part 16 includes an upstanding cylindrical supporting boss 18 machined to provide an outer cylindrical bearing surface which is rotatably engaged by a machined inner cylindrical bearing surface of a hub part 19 formed on the connector 15. The outer cylindrical bearing surface of boss 18 terminates at its lower end in an upwardly facing annular thrust bearing surface 20, on which is rotatably supported the lower machined end 21 of the hub 19. In addition to providing for the support of the frame parts 15 and 14 from the base 13, the boss 18 and hub 19 also provide for adjusting the frame part 15 and the frame part 14 carrying the barrel 12, about an upright axis to vary the traverse of the gun. .The gun may be locked by hand in any position of adjustment about the upright axis of its support by a suitable wedging cam 22 fixed to a shaft 23 which is journaled in horizontal aligned openings in the frame part 15 and is provided with a suitable handle 24 fixed to its outer end (see Figs. 3 and 10). As will be apparent, rotary movement of the -handle 24 in one direction results in the cam'22 being forced into locking engagement with the outer surface of the boss 18 and movement of the handle in the opposite direction disengages the cam from the boss.

In order to make the gun mount-more stable the connector 15 is provided with an extension 25 having a curved outer edge 26 carrying radially arranged roller bearings 21 fitting between upper and lower bearing surfaces 28 and 29, respectively, which define a sectorial or partially annular groove 30 in the central body part 16 of the support 13. The'center of curvature of the edge 26 and the groove 30 is the upright axis of the boss 18.

The connector 15 is provided at opposite sides thereof with a pair of upwardly extending vertical flanges 31 and 32, respectively, which provide for pivotally supporting the upper frame part 14 for movement about a horizontal axis so as to vary the elevation of the gun (see Fig. 8). The flanges 31 and 32 are provided with horizontally aligned bearing openings 33 and 34, respectively, which receive trunnion portions 35 and 36 of pivot studs 37 -and 38. The latter are provided at their respective inner ends with threaded portions 39 and 40 which are secured within similarly threaded outer ends of a pair of horizontally aligned openings 4 V and 42, respectively, provided through the lower thickened portions of flanges 43 and 44 which extend downwardly from opposite sides of 6 the upper frame part 14.

From the foregoing, it is apparent that I have provided a simple and rugged support for the upper frame 14 carrying the gun barrel 12, which support provides for varying both the traverse 6 and the elevation of the gun within wide ranges.

The upper frame 14 can be readily detached from the connector 15 by unscrewing the pivot studs 37 and 38. Handles 45 extending from opposite sides of the frame 14, facilitate movement of the gun 7, to adjust the traverse and elevation thereof.

Provision is also made for locking the gun in any desired position of adjustment as to elevation (see Figs. 6, 8, and 12). To this end, the upper part of flange 31 of the connector 15 is in the form 71 of a sectorial rack member 46 which is adapted to be engaged by a pawl 47 pivoted to a fixed bracket 48 formed on the frame part 14 and including an upwardly extending actuating arm 49. A tension spring 50 connecting the arm 49 and a fixed stud 51 on the frame part 14, constantly urges the pawl into locking-engagement with the rack 46. An actuating rod 52 is slidably mounted in spaced brackets 53 and 54 on the frame 14 and is provided at its outer end with an actuating member 55 which extends through an opening in the front wall of the frame 14 so that it can be readily engaged and pushed inward by the thumb of the gunner. The inner end of the rod 52 terminates against the arm 49, so that when the operator pushes the rod inward, the pawl 47. will be released from the rack 46 and the elevation of the gun can then be varied by moving the frame about the axis of the pivot pins 37 and 38. When the member 55 is released the spring 50 will move the pawl 47 into locking engagement with the rack. To assure the return of the rod 52 to the position shown in Fig. 12, a compression spring 55 encircles the rod 52 and is interposed between the bracket 54 and a stop collar 56 fixed to the rod 52. In the extended position of the rod the collar 56 engages the bracket 53 to position the rod. A suitable guard 57 is provided to prevent accidental actuation of the rod 52.

uo Referring particularly to Figs. 3, 5, and 9, it will be observed that the gun barrel 12 is rigidly mounted in the upper frame part 14 and that the barrel is provided with a plurality of pairs of longitudinally extending slots 57, 58, and 59; respectively. The pairs are arranged in spaced relation to one another along the axis of the gun barrel, and the slots formed in each pair are in opposed relation to one another on opposite sides of the axis of the barrel. There is also provided 41 a plurality of spaced pairs of friction rollers 60, 61, and 62, respectively, for the several pairs of slots and the rollers function to frictionally engage and thereby propel projectiles through the bore of the barrel. There is a roller for each 4; slot and each roller is mounted for rotation about a fixed axis with respect to the frame part 14 and for rotation in approximately the same plane as the other roller of its pair and so that the rim Sor tread of each roller projects partially into its respective slot where it can frictionally engage a projectile in the bore of the barrel. The rims of the rollers are preferably formed of a suitable resilient friction material, for example, rubber.

The rollers of each pair are spaced apart such Sa distance that when a projectile occupies the space therebetween, there is a substantial deformation of the rubber rim thereby assuring a firm grip on the projectile. The reference numeral 63 indicates one form of projectile which is suitable 0 for use in the gun 10 and will be described more fully hereinafter.

As shown by the arrows in Fig. 5, all of the rollers are constantly rotating in directions so that the portions thereof within their respective 5 slots always move in the general direction of extent of the barrel, i. e. from the breech end toward the muzzle end. When a projectile is fed between- the first pair of rollers 60, it will be frictionally engaged thereby and be propelled at a 0 rapid rate along the barrel and into frictional engagement with the second pair of rollers 61 which will then engage the projectile and propel the same forward into engagement with the third pair of rollers 62. The latter will also propel the 5 projectile forward and will discharge the projectile from the muzzle and toward the selected target. The pair of rollers 6S is spaced from the pair 60 and the pair 62 is spaced from the pair 6I sufficient distances so that the projectile will not be engaged by the pair 61 until it has been released by the pair 60 and will not be engaged by the pair 62 until it has been released by the pair 6 1.

Provision is made for driving the rollers of each pair at the same speed and for driving the several pairs of rollers at progressively higher speeds considered in the direction of travel of the projectile so that the rate of movement of the projectile will be progressively increased as it moves through the bore of the barrel and until it reaches its maximum speed when released by the last pair 62. As will be readily understood, the respective speeds of the rollers will be selected to provide the desired muzzle velocity of the projectile and resulting range for the gun. In the particular embodiment shown provision is made for driving the pair of rollers 60 at a rate of sixty feet per second, the pair 61 at one hundred twenty feet per second, and the pair 62 at one hundred sixty feet per second. These speeds will provide an effective range of two hundred yards for the gun, with due allowances for losses such as air friction, drive wheel slippage, etc.

In the construction shown, the motive power for driving the several pairs of rollers is provided by an internal combustion engine indicated at 64 and carried by the pedestal support 13. The engine 64 is arranged so that an extension 65 of its crank shaft extends vertically upward through the center of the boss 18 and so that the axis of the extension shaft 65 is coincident with the axis of the outer cylindrical bearing surfaces of the boss 18. The upper part of the extension drive shaft 65 is supported for rotation in a journal bearing 66 formed as a part of a web 67 integral with the upper end of the boss 18 (see also Fig. 8). A bevel gear 68 is fixed to the upper end of the drive shaft 65 and meshes with a bevel gear 69 fixed to a shaft 70 rotatively supported by the upper frame part 14. The two ends of the shaft 70 are journaled, respectively, in the inner ends'of the horizontally aligned openings 41 and 42 of the downwardly extending flanges 43 and 44 arid so that the axis of rotation of the shaft 70 is coincident with the axis of the trunnion portions 35 and 36 of the pivot studs 37 and 38.

Two bevel gears 71 and 72, respectively, are fixed to the shaft 70 on opposite sides of its connection with the drive shaft 65 and at approximately equal distances from the axis of the shaft 65. The gears 71 and 12 mesh, respectively, with bevel gears 73 and 74 fixed to the rear ends of shafts 75 and 76 (see also Figs. 7 and 9). The shafts 75 and 76 extend in the same general direction as the gun barrel 12 and are arranged in spaced approximately parallel relation to one another. Each of the shafts 75 and 76 is supported for rotation about its respective axis by spaced journal bearings 77 and 78 fixed in the upper frame member 14. Bevel gears 79 and 80 are fixed to the forward ends of shafts 15 and 76, respectively, and mesh with bevel gears 81 and 82 fixed to the lower ends of shafts 83 and 84, respectively, to which are fixed rollers 61a and 61b composing the pair 61. The shafts 83 and 84 are suitably supported for rotation about fixed axes in the upper frame part 14.

With the internal combustion engine 64 in operation, the above described power transmitting Shafts and gears provide for the rotation of rollers 61a and 6ib in opposite directions and.so that the rim! portions thereof occupying their respective slots will move in the general direction of extent of the gun barrel. See the directional arrows in Fig. 5.

It is noted that the previously described adjustment of the gun for traverse and elevation can be readily effected at the same time the rollers are being driven from the engine 64: This is due to the fact that the axis of the shaft 65 is coincident with the axis of the outer bearing surface of boss 18, and because the axis of shaft O0 is coincident with the axes of trunnion portions 35 and 36, and because of the bevel gear drive connection between shaft 65 and shaft 70 and between shaft 70 and shafts 75 and 76.

Provision is made for driving both the pair of rollers 60 and the pair of rollers 62 from the shafts 83 and 84 on which the rollers 61a and 61b of the pair 61 are fixed. Fixed to the upper end of shaft 83 is a relatively small pulley wheel 85 and a relatively large pulley wheel 86, and fixed to the upper end of shaft 84 is a pulley wheel 87 of the same size as the wheel:85 and a pulley wheel 88 of the same size as wheel 88 (see Figs. 3, 4, 5, 7, and 9).

Rollers 60a and 60b composing the pair 60 are fixed, respectively, to shafts 89 and 90 and the latter are journaled for rotation about fixed axes in the upper frame part 14. Likewise, rollers 62a so and 62b composing the pair 62 are fixed, respectively, to shafts 91 and 92 which are also journaled for rotation about fixed axes in the upper frame part 14. Fixed to the upper ends of.the shafts 89 and 90, are pulleys 93 and 94, respectively, of the same diameter; and fixed to the upper ends of shafts 91 and 92, are pulleys 95 and 96, respectively, which are also of the same diameter. An endless driving belt 97 connects the pulleys 85 and 93; a belt 98 connects the pulleys 87 and 94; a belt 99 connects the pulleys 86 and 95; and a belt 100 connects the pulleys 88 and 96.

In the particular construction which I have elected to show, the size relationship between the several pulleys is such that with the rollers 6la and 61b being rotated at the aforementioned rate of one hundred and twenty feet per second, the rollers 60a and 60b are driven at the .rate of sixty feet per second, and the rollers 62a and 62b at the rate of one hundred and sixty feet per second. It will be appreciated, however, that the present invention is not limited to the particular size relationship of parts which is disclosed or to the particular speeds given, for obviously they can both be varied within wide ranges without departing from the intended scope of the invention.

Furthermore, the invention in all of its aspects is not limited to the particular number of pairs of rollers disclosed, for obviously, the number of pairs will vary with the requirements of the gun, such for example as the desired range, size of the projectile, etc.

A relatively small internal combustion engine for example, from three to five horse power, is sufficient to operate the gun in the manner explained above. The fuel tank required for an engine of this size is also small, for example, a onegallon tank is 'sufficient for normal use. The tank, not shown, is carried by the pedestal support 13. Furthermore, I prefer that a relatively heavy fly wheel be used on the engine in order to provide and maintain a large amount of reserve power which is instantly available upon engagement of a projectile by the propelling rollers. While in so far as certain of the broader aspects of the present invention are concerned, the projectiles 63 may be fed into the breech end of the barrel 12 and into operative engagement with the first pair of rollers 60 by any suitable means, such for example, as by hand; I provide in the embodiment disclosed an automatic or magazine type of feeding mechanism which is so constructed that the gunner may at his discretion arid under the control of a trigger device, feed a single projectile and discharge it from the gun, or the projectiles may be fed and discharged intermittently in bursts, or continuously in a stream.

SFormed as a part of the frame part 14, is an upper cylindrical magazine chamber I 10 which is constructed with its axis approximately parallel to that of the gun barrel, and is connected by a downwardly extending tangential passage 11 with a lower chamber I12 which houses the projectile feeding mechanism and into which the rear or breech end of the barrel 12 projects. As shown in Figs. 3 and 6, the projectiles 63 are assembled on a feed belt I 13 made of suitable cloth fabric and which is wound around a light metal spool I 14 rotatably mounted on a spindle 115.supported axially within the magazine chamber 110.

The belt 113 is formed with a plurality of similar and equally spaced pockets 116 into which the projectiles are respectively inserted; and the pockets are so arranged that the projectiles extend transversely of the direction of extent of the belt. The spindle 115 is fixed at its forward end to the forward wall i17 of the chamber 110 and extends rearwardly from the wall I17 and axially of the chamber 110 and is supported at its rear end within an opening I18 in a door 119, the latter being suitably hinged to the frame part 114 and closing the entire front of the chamber 110, passage I 1, and chamber 112. As stated, the spindle 115 provides the rotary support for the spool 114, the latter being provided with an axial passage 120 which receives the spindle 115. Thedoor 119, when closed, also holds the spool in place on the spindle. Spring fingers 121 radiating from the spindle 115 and engaging at the outer ends thereof the forward side of the spool 114, provide a means for constantly resisting the rotation of the spool 114 so that the belt 113 will be kept taut as it is being fed.

Referring to Figs. 3, 4, 6, 7, 8 and 13, it will be observed that there is located in the lower chamber, a feed mechanism indicated generally at 125 and which operates to feed the projectiles 63 one at a time into a position behind the breech of the gun where the axis of the projectile occupying such position is coincident with the axis of the gun, and the mechanism 125 also operates to feed the projectile occupying such position axially into the breech end of the gun and into engagement with the first pair of rollers 60 which is conjunction with the other pairs of rollers 61 and 62, operate to propel the projectile through the barrel and discharge the same toward the target.

Forming a rearward extension of the gun barrel 12 is a positioning, or stop, plate 126 which is for the most part arcuate in cross section with the same radius and axis as that of the gun barrel 12 so that when a projectile 63 is in full engagement with the arcuate portion of the plate 126 it can be fed axially therefrom into the breech (see Fig. 6). The plate 126 is provided at its lower edge with a tangentially extending guide flange 127 which functions to guide the projectile into full engagement with the arcuate portion of the plate 126. -The feed mechanism 125 comprises a pair of spaced feed sprockets 128 and 129, respectively, mounted on a shaft 130 for rotation therewith.

The shaft 130 is arranged with its axis in spaced parallel relation with the axis of the gun barrel 12 and positioning plate 126, and is supported for rotation in spaced journal bearings 131 and 132, respectively, fixed to the frame 14. The sprockets 128 and 129 are provided with an equal number of radial teeth or pins and with arcuate portions between the pins shaped to receive the side of a projectile. The teeth of the sprockets 128 and 129 are equally spaced angularly with respect to one another and the teeth of one sprocket are so positioned with respect to the teeth on the other sprocket that with rotation of the shaft 130 in a counterclockwise direction as viewed in Figs. 6 and 8, the sprockets simultaneously engage and feed in succession projectiles 63 into full engagement with positioning plate 126. 2o As shown in Figs. 3 and 4, the teeth of sprocket 128 engage the belt 113 with the pockets 116 and the projectiles 61 therein, fitting between the teeth. The sprocket 129 is arranged forward of the forward longitudinal edge of the belt and the teeth thereof engage the projectile directly.

Thus, the sprocket 128 also functions to unwind the belt from the spool 114 and advances the belt and the projectiles into position where the projectiles can be simultaneously engaged by both sprockets 128 and 129 and moved thereby against the positioning plate 126. As stated above, the spring fingers 121 function to resist the unwinding movement of the spool 114 and thereby keep the belt taut. The upper chamber 110, passage 111, and lower chamber 112 are formed with a pair of spaced parallel guide ribs 134 and 135 respectively, which extend in the general direction of feed of the belt and which' function to guide the projectiles into the spaces between sprocket teeth and also cooperate with the sprocket teeth and with the guide flange 127 to feed the projectiles one at a time into full engagement with the positioning plate 126.

The positioning plate 126 is provided with a ' longitudinally extending slot 136 therein and a constantly rotating feed roller 137 projects partially therein and functions when the sprockets move a projectile into position against the plate 126, to frictionally engage the projectile and 5move the latter out of its pocket 116 and axially into the breech of the gun and into operative engagement with the first pair of rollers 60. The teeth or pins 138 of sprocket 129 are formed as rollers so as to facilitate this axial feeding movement of the projectile while the projectile is held by the sprockets in position against the plate 126.

As soon as a projectile is moved into the gun barrel, the sprockets 128 and 129 feed the next projectile into position against the plate 126. The C6 rim of the roller 137 is preferably formed of a suitable resilient material such as rubber, -so as to assure frictional feeding engagement with the projectile. The lower chamber 112 is provided with a slot 139 through which the emptied portion of the belt 113 is fed from the gun.

The roller 137 is fixed to a shaft 140 which is journaled to rotate in bearings 141 and 142, respectively, fixed to the frame 14. The roller 137 and the sprockets 128 and 129 are driven from TO the shaft 90 of roller 60b. To this end, a driving pulley 143 is fixed to the lower end of shaft 90 and is connected by an endless driving belt 144 to a pulley 145 fixed to the lower end of shaft 140 on which the roller 137 is fixed. A worm 146 is provided on the upper end of shaft 140 and meshes with a worm wheel 147 fixed to one end of a shaft 148 rotatably mounted in a journal bearing 149 fixed on the frame 14 (see Figs. 7 and 13). A bevel gear 150 is fixed to the other end of shaft 148 and meshes with a bevel gear 151 fixed to a collar 152 loosely mounted to rotate on shaft 130.

Also fixed to the collar 152, is a friction clutch plate 153, and a disk 154 of suitable friction material surrounds the collar and is interposed between the side of clutch plate 153 and the side of sprocket 128. The latter is formed with a hub 155 which is connected by a spline coupling 156 with a collar 157 keyed to shaft 130. By reason of the spline coupling 156 the shaft 130 will rotate with the sprocket 128 but the sprocket 128 can move axially with respect to the shaft and collar 1'57. A compression spring 158 is interposed between the collar 157 and the sprocket 128 and serves to constantly urge the side of the sprocket into frictional engagement with the friction disk 154. The collar 152 is shown as extended toward the right, as viewed in Fig. 13, and as engaging at its end the hub of sprocket 129. This is for the purpose of taking the end thrust of the spring 158 in the right-hand direction. The sprocket 129 is fixed by a suitable pin to the shaft 130, as shown.

From the foregoing, it is apparent that the feed roller 137 rotates constantly in-a feeding direction as long as the engine 64 is operating, and that the feed sprockets 128 and 129 also rotate in a feeding direction as long as the sprockets are not held against rotation by some opposing force sufficient to cause slippage between the disk 154 and the side of sprocket 128. One example of such an opposing force is when a projectile is moved into position against the plate 126, the sprockets can not rotate further until the feed roller 137 moves such projectile out of the way and into the gun barrel. During such time the friction disk 154 slides over the surface of the sprocket 128 and the sprockets; hold the projectile hard against the plate 126 until it is fed into the gun barrel.

I also provide a trigger device so that the gunner can control at will the discharge of projectiles from the gun. The trigger device may be operated so as to discharge only one projectile, or to discharge the projectiles intermittently in bursts, or continuously in a stream (see particularly Figs. 8. 11 and 13). Fixed to the hub of sprocket 129, is a ratchet wheel 160 having equally spaced ratchet teeth 161 equal in number to the teeth on the feed sprockets. A pawl 162 pivoted to a stud 163 which is fixed to the frame part 14, is adapted to selectively engage the teeth 161. When the pawl engages a selected tooth 161, the sprocket 129, shaft 130 and sprocket 128 are held thereby against rotation and in such a manner that, if a projectile occupies the space between the two sprockets and the plate 12S, such projectile will be pressed firmly by the sprockets against the plate 126 and with sufficient force for the projectile to be fed by the roller 137 into the gun. After the projectile is fed into the barrel 12. the pawl 162 will continue to hold the sorockets 128 and 129 and shaft 130 against rotation until the pawl is moved by the gunner out of engagement with the ratchet. While the pawl 162 engages a tooth 161, the friction disk 154 slips over the side surface of the sprocket 128, as will be readily understood.

The pawl 162 is provided with an upstanding actuating lever arm 164 which is connected by a link 165 to one arm 166 of a bell crank 167 pivoted to a fixed stud 168. The other arm 169 of the bell crank 167 is operatively engaged by the forked outer end of arm 170 of a second bell ,5 crank 171 pivoted to the fixed stud 172. An actuating rod 173 is slidably supported in spaced brackets 174 and 175 and terminates inwardly against a second arm 176 of the bell crank 171.

The rod 1T3 terminates outwardly in an actuat'10 ing button 177 extending outwardly through an opening in the outer Wall of frame 14 and where it can be engaged and pushed inwardly by the thumb of the gunner. As will be apparent, when the rod T73 is pushed inward such motion is r5 transmitted through the bell cranks 171 and 167 and link 165 to the pawl 162 and the latter will be rocked counterclockwise as viewed in Fig. 8 and out of engagement with the ratchet teeth 161 and thereby permit the feed sprockets to be roI>n tated in a counterclockwise or feeding direction through the friction disk 154. A guard 178 protects the button 177 against accidental actuation.

A tension spring 18 connecting the outer end of arm :164 and a fixed stud 181, serves to con..- stantly urge the pawl 162 into engagement with the ratchet so that as soon as the rod 173 is released by the gunner, the pawl engages the ratchet and stops further feeding of the projectiles. A compression spring 183 encircling the rod 173 and : interposed between the bracket 175 and a collar 184 fixed to the rod 173, serves to constantly urge the rod 173 outwardly, or to the left as viewed in Fig. 11. The collar 184 engaging the bracket 174 limits outward movement of the rod 173 by :15 the spring 183 and thereby serves to determine the outer position of the rod.

The operation of the gun by the trigger device will be apparent from the foregoing description.

If the button 177 be pressed inward by the operator and immediately released, the pawl 162 will be lifted from engagement with a tooth 61 and will engage the next tooth thereto as the sprockets and ratchet wheel are rotated through the friction disk 154. This will result in the discharging 4., of one projectile from the gun. If the button is held inward :by the gunner, projectiles will be discharged automatically in rapid succession from the gun and as long as there are projectiles in the magazine, or until the button 17T is released. no From the foregoing it is apparent that I have provided a-new and improved portable gun which is simple-and rugged in construction, and which mechanically discharges explosive projectiles with comparative safety and with a relatively high denr gree of accuracy. Its range will depend upon the speed and number of propelling rollers used and the size and weight of the projectile. Due to its wide range of adjustment as to elevation, it can perform the same function more accurately and 6,) at a longer and safer range than the hand grenade. Furthermore, as the projectiles are mechanically discharged it can be used advantageously in the place of a short-range trench mortar.

i5 In Figs. 14 and 15, I have shown by way of example, one form of projectile which can be used in my improved gun. The shell 63 is of the type which explodes upon impact and comprises a body 186 having a chamber 187 containing the main charge and a small chamber 188 containing the booster charge. A nose piece 189 is slidably mounted on the end of the body and is urged outward by a compression spring 190 encircling a rod 191 which is slidable in the body 186 and is fixed at its outer end to the nose 189.

In order to prevent accidental explosion of the projectile while handling and prior to discharge from the barrel 12, I provide a safety latch 192 which is pivoted at 193 to the body 186 and in its safe position lies within a longitudinal groove 194 in the body 186. When in the safe position, the toe 195 of the latch is positioned behind a flange 196 formed on the nose 189 and thereby prevents inward sliding of the nose. Before the projectile is ready to be inserted in a pocket 116 of the belt 113, the latch 192 is held in the safe position by a safety pin 197 which extends through openings in the outer end 198 of the latch and through openings in directional fins 199 formed on the end of the body 186. The pin 197 is removed when the projectile is inserted in a pocket 113 and the pocket then holds the latch in the safe position. After the projectile leaves the muzzle the latch 192 is forced outward by a compression spring 200 mounted in a recess in the body 186, which results in the toe part 1'95 clearing the flange 196. Then when the projectile strikes the target, the nose piece 189 is forced thereby backward on the body a sufficient distance to cause the flange 196 to clear an arm 202 of a firing lever 203 which is pivoted at 204 to the body 186 and is constantly urged in a firing direction by a spring 205. The other arm 206 of the lever 203 carries a firing pin 207 at its outer end; and, when the flange 196 clears the arm 202, the spring 205 moves the lever 203 with sufficient force for the firing pin 207 to strike and set off the detonating cap 208 which in turn sets off the igniting charge and then the main charge.

While there have been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is: 1. A gun for projectiles comprising a frame structure; a barrel mounted in said frame structure and including a breech end and a muzzle end; means for mechanically propelling a projectile fed into said breech, through said barrel and out said muzzle; and means for feeding projectiles into said breech comprising means defining a surface shaped to guide projectiles into feeding position where they can be moved axially into said breech, a sprocket including teeth spaced to engage successively the projectiles and cooperating with said guide surface to move the projectiles therealong and into said feeding position, a feed roller including a friction tread and rotatable in a plane approximately parallel with the gun axis and positioned behind said breech end and where a projectile as it is moved into said feeding position is forced into frictional engagement with said friction tread, and means for rotating said feed roller in a direction to move the projectile into said breech end.

2. A gun for mechanically discharging projectiles and comprising a supporting frame structure; a barrel mounted on said frame and including a breech end and a muzzle, and said barrel having a pair of slots therein located in opposed relation on opposite sides thereof; a pair of propelling rollers for said pair of slots, and each roller including a peripheral tread part and being rotatably supported on said frame in position where its tread projects partially into its respective slot and is adapted to engage frictionally the side of a projectile within said barrel; means for driving said rollers in directions so that the portions of the treads occupying said slots move toward said muzzle; and means for feeding a projectile into said breech and in a position where it is frictionally engaged by the treads of said propelling rollers and said last named means comprising a continually rotating feed roller including a friction tread, and said feed roller being located behind said breech and positioned so that its tread, when engaged by a projectile, feeds the latter into said breech, and devices for successively feeding projectiles against the tread of ,' the feed roller and for holding each projectile in frictional engagement with said feed roller tread while the latter moves the projectile out of the way and into said breech.

3. A gun for mechanically discharging projectiles and comprising a frame structure; a barrel mounted in said frame and including a breech end and a muzzle end; means for feeding a projectile into said breech comprising a continually rotating feed roller including a friction tread, and said roller being located behind said breech and so positioned that its tread, when engaged by a projectile, feeds the latter into said breech, and devices for successively feeding projectiles against th tread of said feed roller and for holding each projectile in frictional engagement with said tread while the latter moves the projectile out of the way and into said breech; and means engaging each projectile as it is fed into said breech and operable to propel mechanically the projectile 65 through the barrel and out the muzzle.

SAMUEL BRAND.