GB794045A - Motor-driven screwing-in tool for screwing-in and tightening screws or nuts - Google Patents

Abstract

794,045. Screwing-up nuts. WILLE, E., and WILLE, W. July 12, 1955 [July 28, 1954; Dec. 6, 1954], No. 20118/55. Class 83 (3). [Also in Group XXIV] A nut-running socket 15 is driven at high speed until it encounters tightening resistance, which renders effective a low-speed drive which may be either geared or by a separate electrical, pneumatic or hydraulic motor, and drives through a torque-limit coupling 14. A single motor 1, Fig. 1, drives the socket 15 at high speed, through primary reducing-gear 3, slipcoupling 7, shaft 12 and torque-limit-coupling 14. Tightening resistance causes the coupling 7 to yield, whereupon a previously over-running one-way clutch 13 picks up a low-speed drive through a countershaft pair 9. Multiple sockets 23, Fig. 3, each including a torque-limit coupling 14, are simultaneously driven at high speed by a motor 16, worm-gears 17 and slip-couplings 18, which, on encountering tightening resistance, slip and operate means, not shown, for energizing an hydraulic &c. motor 19 which turns the sockets at low speed through a rack 20, pinions 21 and previously over-running oneway clutches 13. Fig. 5, not shown, is similar to Fig. 3, but shows only one nut socket. The coupling 14 is formed by a torsion-shaft carrying the socket at one end, mounted inside the shaft 22 and drivingly connected to that shaft by a claw-clutch which is automatically disengaged at a predetermined torsional yield of the inner shaft, by contacts adjustably carried on the outer and inner shafts, respectively, and energizing a device, not shown, for releasing the claw-clutch and switching off the low-speed motor.