Claims:
I claim
1. A portable magnetic boring machine having a centering device, said boring machine comprising:
2. Apparatus as claimed in claim 1, including means for releasably securing the light projector to said main body.
3. Apparatus as claimed in claim 10, wherein the housing of the light projector is non-linear and includes a mirror therein to reflect the light through the housing.
4. Apparatus according to claim 1 wherein said boring machine is a drilling machine.
5. Apparatus according to claim 1 wherein said main body is slideably movable relative to said magnetic base to locate the boring point.
6. Apparatus according to claim 1 wherein said magnetic base is slideably movable relative to said magnetic surface to locate the boring point.
7. Apparatus according to claim 6 wherein said main body is further slideably movable relative to said magnetic base to locate said boring point.
8. Apparatus according to claim 1 wherein the position of said light projector on said main body is adjustable to locate the focus of said light beam on the extended line of the boring axis of the boring machine to define the boring point.
9. Apparatus according to claim 1 including means for electrically magnetizing said magnetic base after centering to effectively fix the boring machine in the centered position.
10. Apparatus according to claim 1 wherein said source of light is a single electric bulb (172) having a pair of crossed filaments (173,174) therein for emitting a generally cross-shaped light beam.
11. Apparatus according to claim 1 wherein said source of light comprises a pair of electric light bulbs mounted in said housing, said light bulbs having substantially linear filaments which are substantially perpendicular to each other, and wherein said lens means includes a pair of individually adjustable lenses respectively focusing the light from each of said electric bulbs for focusing the light emitted from said electric bulbs into said cross-pattern.
12. Apparatus according to claim 11 wherein said housing includes a partition between said two electric bulbs.
13. Apparatus according to claim 1 wherein said light emitting filaments are substantially arranged at right angles.
Description:
FIELD OF THE INVENTION
The present invention relates to apparatus for centering for use in boring machines.
An object of this invention is to provide a method of centering for boring machines, which facilitates easy and rapid centering operations.
Another object of this invention is to provide light projectors for centering.
SUMMARY OF THE INVENTION
According to the present invention there is provided a centering apparatus for use in a boring machine comprising a light projector carried on a boring machine, means for focusing light provided by the projector on to a surface to be perforated, a boring unit carried on the boring machine and movable vertically relative to the boring machine, magnetic means for adjusting the position of the light projector and boring unit so that the projected light can be focused at a point on a surface to be perforated which point is intersected by an extension line of said boring unit.
BRIEF DESCRIPTION OF DRAWINGS
The present invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a side view of a boring machine with magnetic board provided with one embodiment of the present invention;
FIG. 2 is a cross-sectional view of a light projector for centering, embodying the present invention;
FIG. 3 is a cross-sectional view of a modified type of a light projector for centering;
FIG. 4 is a perspective view of a disc mounted between a plurality of condensing lenses;
FIG. 5 is a cross-sectional view of another light projector for centering, embodying the present invention;
FIG. 6 is a cross-sectional view of the light projector shown in FIG. 5 taken along the line VI -- VI;
FIG. 7 is a cross-sectional view of still another light projector for centering embodying the present invention;
FIG. 8 shows crossed filaments used in the embodiment shown in FIG. 7;
FIG. 9 shows diagrammatically electric circuits used for a boring machine with a magnetic board; and
FIG. 10 is a side view of a floor boring machine, embodying the present invention.
DESCRIPTION OF SPECIFIC EMBODIMENTS
The present invention will now be described in more detail with reference to the accompanying drawings in which the same parts are indicated by the same reference numerals.
FIG. 1 shows a boring machine with a magnetic base board consisting of a main body 101, and a vertically movable member 102 which is movably located on the front side of the said main body. A portable boring machine 103 provided with a drill 106 is connected to the said vertically movable member by supporting arms 104 and 105. A handle 107 is pivoted to a side of the main body 101 to move vertically the movable member 102 by rotating a pinion (not shown) installed in the main body 101 and intermeshing with a rack 108 provided on the back surface of the movable member 102. A supporting and moving wheel 109 is carried at the lower end of the main body and a magnetic base board 110 is located underneath the middle of the bottom of the main body 101. A steel sheet 111, which is to be perforated has on its surface 112 a punch mark P. The light projector for centering 113 has a switch 114 and a cord 115.
As shown in FIG. 2, the light projector for centering 113 is provided with a light source 123 in a housing 122 provided with a fitting means 121 for the main body 101 of the boring machine. Projected light from the light source is reflected from the surface of a mirror 124 and is focussed by a convex lens 126 provided in a regulation cap 125 at the front of the housing 122.
As shown in FIG. 1, the boring machine with magnetic board 110 is placed on the surface 112 of the material 111 to be perforated. The light projector 113 is adjusted in such a way that the projected light Y from the light projector 113 will focus at a point where an extension line of the center of the drill 106 carried on the boring machine 103 intersects the surface 112 of the material 111 to be perforated. As shown in FIG. 2, this is effected by moving the housing 122 of the light projector 113 and screwing or loosening the regulation cap 125. Then the boring machine with a magnetic board is moved so that the focus Z of the projected light Y may be adjusted to be projected on the punch mark P provided on the surface 112 of the material to be perforated. When the focus Z is adjusted to the punch mark P, electric current is supplied to the magnetic board 110 to magnetize the same and the boring machine 103 is fixed to the material to be perforated.
In this way, centering is very easily conducted, and such repeated centering operations as are required in prior methods according to which the end of the drill 106 is brought close to the punch mark P by means of the handle 107 become unnecessary.
The boring machine with a magnetic board shown in FIGS. 1 and 2 must be moved on the surface of the material to be perforated 111 for the purpose of centering. On the other hand, in order to conduct centering with a floor boring machine as shown in FIG. 10, the material 133 to be perforated is clamped by a vice 132 provided on a table 131 and is moved so that the focus Z of projected light Y is aligned with a punch mark to be perforated on material 133. The light projector 113 is adjusted in advance in such a way that the projected light Y from the light projector 113 will focus at a point where the extension line X of the drill 106 intersects the surface 134 of the material to be perforated 133. When the same material is to be perforated at many points in mass production, centering is easily conducted by moving a material to be perforated in such a way that the focus Z of the projected light Y is adjusted to various punch marks and the material 133 is clamped with the vice 132. Thus, with this boring machine, it is unnecessary even in mass production to repeatedly conduct centering at every punch mark by bringing the end of the drill 106 close to the punch marks provided on the material to be perforated.
When the focus Z of the projected light Y is not perceptible because centering is conducted outdoors, colored light may be effectively used as a projected light. Moreover, the light projector 113 may be used as a common illumination device by removing the regulation cap 125 thereof.
As has been described so far, the present invention facilitates easy and rapid centering for perforation by adjusting a focus of the projected light from a light projector which is controlled properly in advance to a punch mark provided on the surface of a material to be perforated, instead of conventional operations for centering by repeatedly bringing the end of a drill close to a punch mark.
Any light projector may be used as a centering apparatus in the present invention. The light projector shown in FIGS. 3 and 4 is fixed to the main body of a boring machine and adjusted in such a way that a projected light from the light projector will focus as a cross at a point where the extension line of the drill intersects the surface of a material to be perforated.
The light projector 141 shown in FIG. 3 comprises an electric bulb 123 installed in a housing 142. A movable body 146 provided with a convex lens for condensing light 143 and a disc 145 having an aperture in the shape of a cross is screwed to the inside of the housing 142. A regulating cylinder 148 provided with a convex lens 147 is located at the end of the housing 142. The projected light Y may be adjusted to focus at a point where the extension line X of the drill 106 intersects the surface of material to be perforated 111 and the precise adjustment of the position of focus Z is conducted by turning the regulating cylinder 148. The aperture in the form of a cross 144 provided in the disc 145 serves to make the focus Z of the projected light Y in a cross, which facilitates the adjustment of the focus to a punch mark provided on the surface of a material to be perforated.
When the drill 106 of a boring machine is to be aligned with a punch mark P, the magnetic board 110 is moved to a proper position and fixed or the main body 101 which is provided with a boring machine 104 and mounted on the magnetic board 110 is adjusted, the magnetic board being left as it is. In either way the projected light Y is adjusted to the punch mark P.
In the rear part of the housing 152 of the light projector 151 shown in FIGS. 5 and 6, electric bulbs 153, 154 are installed in such a way that the filaments thereof are provided perpendicularly to each other. The housing 152 further comprises convex lenses 157, 158 mounted adjustably at the end of the housing 152, projecting pieces 159, 160 which are fixed to the convex lenses 157, 158 and project outwardly from the long slots 161, 162 provided on the wall of the housing and a partition wall 163 to divide the inside of the housing 152. The convex lenses 157, 158 are adjusted in such a way that light from at least two electric bulbs which are provided in such a way that the filaments thereof are perpendicular to each other will cross each other by passing through the lenses. The light from the electric bulbs 153, 154 is hardly darkened because there is nothing in their way and the light crossed by passing through the convex lenses results in a very light cross focus. As the convex lenses 157, 158 provided with the projecting pieces 159, 160, projecting outwardly from the long slots 161, 162 of the housing 152 respectively, are movably pivoted to each other, any arbitrary pattern of focus of light is obtained by properly operating the projecting pieces and adjusting the images of filaments in arbitrary shapes.
The light projector shown in FIG. 7 facilitates the production of light and distinct focus patterns of light in the form of a cross with one electric bulb and an easy adjustment of the focus pattern. Light projector 171 comprises an electric bulb 172 in which two crossed filaments 173, 174 are provided as shown in FIG. 8 and a cylinder 176 provided with a convex lens 175 adjustably mounted at the end of the light projector 171. As the light source is in the shape of a cross, a very distinct focus pattern in the shape of a cross is obtained, on a material to be perforated, by adjusting the light in the cylinder 176 provided with convex lens 175 without reducing the intensity of radiation. Thus, a distinct and light focus pattern in the shape of a cross is easily obtained with this light projector by only focussing a cross image from the crossed filaments 173, 174 provided in the electric bulb 172 with the convex lens 175, which facilitates an efficient centering operation at such light places as the outdoors. Moreover, it is possible to make a light projector small-sized, because a number of lenses and electric bulbs are not required.
Any circuits may be used for a circuit of the light sources of a light projector. For example, in FIG. 9, alternating current from an AC power source 181 is rectified to direct current by a rectifier 182 comprising a bridge circuit to magnetize an electromagnet 183. A branched circuit 184 branch from a main circuit 185 is connected to a light projector 113.
Light projectors of the present invention are not limited to boring machines for metals but may be applied to any boring machines for wood or for use in offices. Moreover, the present invention is not limited to boring machines having a drill but may be applied to tappings or hand presses, etc., in which a setting position of material to be perforated is indicated instead of focussing at a position where an extension line of a drill intersects the surface of a material to be perforated. Therefore, a plurality of light projectors may be used.