Patent GB-695137-A (GB)
Title: Stud driving tool
IPC: B25C1/12
Filed: 1950-11-23
Abstract: 695,137. Stud-firing guns. DEHN, S. G. (Powder-Power Tool Corporation). Nov. 23, 1950. No. 28686/50. Class 119 [Also in Group XXII] An explosively-operated device for driving studs into walls has a cylindrical housing 10 provided with a handle 11 and containing a firing control cam 13 and a carrier 14 for a firing-pin 16. The carrier 14 has a threaded connection with a barrel 17, a chamber lining 18 being held by the carrier in an enlarged bore of the barrel. A barrel liner 19 holds the flange on a stud 21 against the lining 18 in which is a cartridge 22. Surrounding the barrel is a guide sleeve 23 against which bears a spring 26 held at its forward end by a snap ring 24, Fig. 1b. A deflector pad 27 surrounding the muzzle is carried by a sleeve 28 mounted on the barrel. A spring 29 bearing against the sleeve 28 is seated on a shoulder of the guide sleeve 23. The spring 29 is enclosed in a housing sleeve 31 connected to the housing 10. A dustdeflector cap 32 of resilient material mounted on the muzzle fits a recess 33 in the deflector pad. The handle 11 can be rotatably adjusted on the housing 10 by means of a set-screw 37 carried by the cam and extending through a slot 38 in the housing. Within the housing 10 is a guideplate 41 held in place by a snap-ring 42 and receiving the rear end of the firing- pin on which is a keeper ring 43. Surrounding the firing-pin is a spring 44 seated between the guide plate and a snap-ring 46, and the pin has an annular groove 47 to receive a spring-pressed trigger 48. A stud 51 projects from the carier 14 into a milled groove 52 in the housing 10 to prevent rotation of the carrier during engagement with the barrel. In operating the device, the muzzle of the barrel is pressed against the surface receiving the stud, whereby the carrier 14 is forced backwardly until the upper end of the trigger 48 enters a notch 54 in the cam 13, whereupon a roller 56 on the carrier becomes aligned with an enlarged portion of a groove 57 in the cam. The handle 11 can then be rotated relative to the housing to release the trigger and hence bring the firing-pin into engagement with the cartridge. When the device is broken to insert a cartridge, backward movement of the carrier and cocking of the firing-pin is prevented by a spring-pressed latch 63 pivoted in the housing 10 and engaging a notch 61 in the carrier. The latch is held in the inoperative position by a nut 68 screwed on to the housing sleeve 31 and abutting an. annular rib 69 which forms a stop for the carrier 14. Relative rotation of the parts' is prevented by a stud 71 carried by the guide sleeve and engaging in the sleeve 31 A second stud 72 carried by the guide sleeve engages in a groove 73 in the barrel. At the forward end. of the housing sleeved 31 is a collar 76, Fig: 1b, engaged by a flange 77 on the deflector. mounting sleeve 28. The deflector pad comprises a metal plate 81 to which is secured a rubber pad 82, both having an eccentric aperture receiving a pad 84 secured to a swivel plate 86. The swivel plate is rotatably secured to the metal plate 81 by arcuate guides 87. In the swivel plate is an eccentric aperture 88 to receive the mount-- ing sleeve 28. By rotating the plate 86 the position of the aperture 88 relative to the perimeter of the deflector pad can be altered according to the conditions under which the device is used.