Patent GB-238645-A (GB)
Title: A power or hand-driven machine for driving, simultaneously, any desired number of ordinary wood screws into wood and/or leather for securing the same together
IPC: A43D86/00
Filed: 1924-06-06
Abstract: 238,645. Young, C. A., and Wooding- ton, J. K. June 6, 1924. Drilling - machines; screws, inserting. - A machine for inserting a number of screws into wood or leather and primarily intended for fixing heels on shoes has two pillars on which the shoes are clamped in turn, one pillar containing a number of continuously rotating drill-spindles. A one revolution clutch brings the spindles to rest after one advancing movement. The machine may be hand driven. A shaft 2, driven by a friction clutch 81 and a continuously rotating belt-pulley 82, rotates a worm-wheel 4 carrying two cam-discs 6, 34, the former actuating through rods 8, a pair of levers 11 controlling work clamping-heads 13, and the latter actuating, through levers 36, 38, reciprocating heads 43, Fig. 2, which move the tool spindles axially. The pins 39, Fig. 3, connecting the levers 36, 38, is adjustable to vary the strokes of the spindles to suit different lengths of screws. A third cam 75 on the worm-wheel shaft 5 acts through a roller 76 on a hinged rod 77 so as to depress a lever 78 and disengage the clutch 81 after a single revolution. The drills 53, Fig. 2, are mounted on spindles 52 carried by the head 43 in the pillar 44 and are rotated by pinions 51 engaging a long gear-wheel 50 on a central shaft rotated by bevel gears 55 and wheels 57 from the shaft 2. The screwdrivers 54 are mounted on a similar head in the pillar 45 and are rotated by bevel gears 61-66, Fig. 4. The gears 64-60 are loose on the shaft 2 and are selectively engaged therewith by a sliding key67 controlledby collar 68. lever 69, Fig. 3, and handle 70 engaging notches 73 on the machine, frame. Each fork-clamp comprises a pivoted pad 32 shaped to. fit the back of the heel and shoe and a rubber pad 31 secured to a plate 21 suspended by links 25, 27 and a hand lever 26 from a plate 19. Springs 24 press the plate 21 downwardly and a trigger 29 maintains it in the raised position, vertical motion being guided by rods 22. The plate 19 is attached to a rod 18, Fig. 2, pressed downwardly by a spring against a hand wheel 17 keyed to a sleeve 16 screwing in a tapped hole in the head 13. In operation, the plate 19 is adjusted to the required height by the wheel 17, a shoe with the heel in position is placed on the pillar 44. the latch 29 is released and the pads are lowered on to the shoe. The stroke of the spindles and the speed of rotation of the screwdrivers are adjusted to suit the length of screws used, and the machine is started by depressing the treadle 84, which rocks a bell-crank lever 85 and the rod 77 to allow a spring 83 to engage, the clutch 81. The machine may be stopped at any time by depressing a treadle 88 which acts directlv on the clutch lever 78 and simultaneously causes a brake 87 to engage the clutch. When the drill-snindles have been fed and returned, the clamping-head is released and the machine stopped by the cam 75. The drilled shoe is then placed on the pillar 45, another shoe is placed on the pillar 44, and the operation is repeated, screws which have been placed on the drivers 54 being driven into the drilled shoe.