GB294232A - Improvements in and relating to machine attachments for screwing up nuts, studs and the like - Google Patents

Abstract

294,232. Chicago Pneumatic Tool Co., (Assignees of Meunier, L. F.). July 22, 1927, [Convention date]. Attachments for assembling or inserting bolts, nuts and screws.-A yielding drive chuck for screw-driving, stud-setting, &c. forms an attachment to a rotary spindle and comprises driving and driven elements in telescopic relation and having limited axial movement, opposing portions of the elements being provided with replaceable clutch parts. A rotary spindle B mounted in bearings in a casing C, which may form part of a staticnary or a portable machine, is provided with a polygonal end b engaged by a similar bore in a sleeve 15. A second sleeve 16 has a portion 17 slidable and rotatable within the sleeve 15 and a bore rotatably mounted on a reduced extension b<1> of the spindle B, opposing flanges on the sleeves being provided with replaceable clutch dogs 15<b>, 16<b> which are push fits in axial bores in the flanges. The dogs 16<b> have parallel sides while the dogs 15b preferably have divergent sides, as shown in Fig. 6, the edges in each case being bevelled to facilitate slipping. A spring 20 housed in a bore b<2> of the spindle B engages a plug 22 retained in the sleeve 16 by a pin 23 to force the clutch dogs apart within the limits imposed by a divided stamped metal casing 18. A spring 19 keeps the casing together and a flange 15<c> on the sleeve 15 engages an inturned flange on the casing. The device is retained on the spindle B by a ball detent 27 pressed into an annular groove b<3> in the spindle by a sleeve 28 normally depressed by a spring 29 engaging a collar 30 secured to the sleeve 15 by a ring 31. In operation, axial pressure of the work on the screw-driving &c. tool causes the. clutch to be engaged against the spring 20, the driving pressure being determined by the angle of the bevelled edges of the clutch dogs. In a modification, the clutch dogs consist of annular rings of teeth 35<a>, 36a attached to the sleeves 35, 36. The rings are a tight fit on the sleeves and are further secured by flattened portions 35<d> &c. on the flanged ends of the sleeves engaging similarly shaped recesses in the rings. A split metal stamping 38, held together by a spring ring 39, has inturned ends engaging flanges on the rings to limit their axial movement, and the teeth 35<b> are bounded by radial sides while the teeth 36<b> have parallel sides. Sockets. - The tool is held in a socket 16<c>, Fig. 1, on the driven sleeve 16 by a ball 24 pressed inwards by a sleeve 25 actuated axially by a spring 26.