Patent GB-190209979-A (GB)
Title: Improvements in the Method of and Apparatus for Smoothing and Polishing Gun Stocks.
Inventor: BOGGIS WILLIAM
Filed: 1902-04-30
Granted: 1903-04-30
Abstract: 9979. Boggis, W., and Hodgson, J. W. April 30. Lathes.-Relates to the method of, and apparatus for, smoothing and polishing gun - stocks. T h e rotary tool has its surface covered with sand, powdered glass, emery, &c. or prepared fish-skin, or the tool may consist of a disc of stone, emery, &c. or of steel cutters. The tool moves over the surface of the work exactly in the same way as a tracer moves over the surface of a copy, the tool and tracer being attached to the same frame. Fig. 5 shows one form of tool in which a leather disc r covered with fish-skins is damped between two discs t, t<1> on the spindle u turning in thimble bearings o. The disc t is made in a piece with the driving-pulley v as shown. In the case of steel cutters, the thin blades may be fixed to a drum with their edges placed diagonally. Fig. 1 shows one form of machine in which the work is intermittently rotated. The copy is mounted between headstocks d<1> and the tracing-wheel m moves over its surface. The work, namely a roughly-made gun-stock, is mounted between headstocks e<1> of which there may be two pairs arranged one on each side of the copy. The work is acted on by the rotary tools s. The headstocks are carried by a slide c reciprocated horizontally by a crank disc f and connecting-rod g. The tracer and tools are carried by a counterbalanced frame j, j* which slides vertically in the bearings i* of a frame i, i* which in turn is reciprocated horizontally along the bars h* of the fixed frame h, h* by means of a crank disc x and connecting-rod y. The work and copy are intermittently turned over by means of a rack 26 which engages with pinions provided with square &c. holes, through which the mandrels of the headstocks d<1>, e' slide without turning. The mandrels are locked after each turn by a sliding bar actuated by cams 31 mounted on the slide c. The cam shaft 32 is rotated either by the wheel 33 striking against a fixed tappet, or by pawl and ratchet mechanism, or by worm gearing. The rack 26 is actuated by a lever 27 and cam-groove 29 in the disc z. The machine is started by turning the weighted handwheel 22 connected by spur gearing to the rack 9 carrying the belt fork 8 for the fast and loose pulleys 3, 4. The rack 9 is locked in position by a catch 15 which is tripped to stop the machine by a cam 17 and bell-crank lever. The main shaft carries the pulleys 3, 4, 5, and 6, and driving-belts connect the pulleys 5. 6 with the pulleys v of the tool spindles ; or the tool spindles may be driven by bevel gearing. The discs x, z and the disc f derive their motion from the shaft 20 by worm gearing and bevel gearing respectively, and the shaft 20 is connected to the main shaft by worm gearing. Instead of a single carrier j, j* several may be used, one in front of the other, to limit the travel of the slide c. Fig. 8 shows another form of machine in which the work is continuously rotated. The tracer and the rotary tools rare carried by a swing- ing frame h pivoted at 50. The crank disc f for operating the slide c is in this case horizontal, and is rotated from the shaft 52 by elliptical wheels 51 so as to give the slide an even reciprocation. The mandrels of the headstocks e carry worm-wheels 76 which are rotated by worms on a shaft connected to the shaft 69 by bevel gearing 79. The shaft 69 is rotated by a ratchet-wheel 70 and a pawl 72 reciprocated by the cam 74 on the shaft of the disc f and by linkwork. The speed of rotation of the work is lessened as the flat edges of the gun-stock come beneath the tools by means of a cam 83 driven by bevel and worm gearing from the shaft 69. This cam actuates masking-plates 80 which lessen the effective stroke of the pawl 72. The frame carrying the headstocks e, e' is tilted about the axis 78 by cams 64 acting on rollers 63 carried by the frame. The cams 64 are rotated from the shaft 69 by bevel gearing 68 and worm gearing 66, 65. In this machine, a single roller-like tool may be used for acting on several gun-stocks. Several articles, such as the convex hand-guards of gun-stocks, may be secured by clips &c. upon the ridges of a long itudinally-corrugated cylinder, the copy being correspondingly formed. Fig. 11 shows an appliance for finishing the pistol-grip portions of gun-stocks. The bed 90 carries a slide 91 adjustable by a screw 92 with a hand-wheel 93. The slide 91 carries a vertical spindle 95, on which turns the headstock frame 94. The tool 97 is carried by a frame 96 fixed to the bed 90. The mandrel 99 is provided with a hand-wheel 100, and the frame 94 carries movable lugs 103 for preventing rotation of the work when required.