GB336132A - Improvements in or relating to portable power-driven machines for setting-up nuts, screws and the like - Google Patents

Abstract

336,132. Chicago Pneumatic Tool Co., (Assiguees of Meunier, L. F.). Nov. 12, 1928, [Convention date]. Bolts, nuts and screws, assembling, screwing-up, and unscrewing. - In a portable machine having a yielding clutch for screwing up nuts, screws, studs, &c., the driving shaft B has connected thereto or formed integral therewith a clutch part 3 normally maintained out of contact with a co-operating part 9 by a spring 11 acting through a centre point 11a. The part 9 is rotatably secured to a hollow tool shaft 8 by means of balls 10 and is provided with a second set of teeth 9b co-operating with teeth 7b on a sleeve 7 which is slidably keyed to the shaft 8 by balls 78. A spring 12 abuts against an adjustable nut 13 screwing on the shaft 8 and normally maintains the clutch teeth 7b, 9b in engagement. In operation, axial pressure of the screw-driver, nut socket, &c., on the shaft 8 engages the clutch 3, 9, whose teeth are large, whereas the teeth 7b, 9b are smaller so as to disengage when the nut, &c., becomes set. The teeth 7b, 9b preferably engage only once or twice per revolution. The spring 12 lies almost entirely within a recess 7c in the sleeve 7 and the latter is entirely supported by a casing 6 secured to the main casing A by bolts 5, the shaft 8 being thus supported entirely by the clutch members 7, 9. A flange 7a prevents excessive downward movement of the sleeve 7. The shaft B is rotated through reduction gearing, (not shown) from an electric or fluid pressure motor forming a part of the machine.