GB1379240A - Cartridge-actuated fastener-driving tools - Google Patents

Abstract

1379240 Cartridge actuated fastener driving tools IMPEX-ESSEN VERTRIEB VON WERKZEUGEN GmbH 16 Dec 1971 [14 Jan 1971] 58498/71 Heading B4C A cartridge actuated fastener driving tool provided with an axially movable barrel 3 accommodating a fastener driving plunger 7 includes a channel 22 in which a cartridge magazine 24 is located when the tool is in use, and a manually displaceable means engageable with means on the magaine for effecting stepwise advance of the magazine. The displaceable means includes a manually movable member which projects from hand-grip 1, and the displaceable means is actuable independently of the movement of the other tool part. As illustrated step-wise advancement of the magazine 24 carrying cartridges 23 and provided along one or both longitudinal edges with teeth 24<SP>1</SP> is achieved by pushing a sleeve 25 into the hand-grip 1 against bias of spring 26. An elongate spring member 27 has bent ends 27<SP>1</SP>, 27<SP>11</SP> for engaging beneath a tooth 24<SP>1</SP> and the inner end of sleeve 25 respectively. The end 2711 is clamped between the spring 26 and the sleeve 25. Inward movement of the sleeve moves the spring member 27 and thus the magazine. Release of the sleeve permits return of the sleeve and the spring member 27 to their initial positions so that the end 27<SP>1</SP> of the spring member engages beneath the next tooth 24<SP>1</SP>. A spring wire 30 engages beneath a tooth 24<SP>1</SP> so as to prevent movement of the magazine with the sleeve 25 when the latter returns to its initial position. The spring member 27 instead of being separate from the spring 26 may be formed integrally therewith. In operation pressing the muzzle end of barrel 3 against a work surface causes the barrel to move rearwardly in housing 2 so that a cartridge is received in chamber 8. Rearward movement of the barrel also causes cocking of firing pin 12 by means of an arm (16) (Fig. 3, not shown) engaging a spring biased pin 15 mounted in a transverse bore of the firing pin. Squeezing of trigger 18 with the tool cocked causes cam member 19 to move a further cam member 20 against spring bias so as to urge the pin 15 into its bore and out of engagement with the arm (16). Thus the firing pin will move forwardly to detonate the cartridge. When the barrel moves forwardly realtive to the housing after a fastener has been driven a pin 10 projecting into the barrel bore via slot 9 will be engaged by the piston head 7<SP>1</SP> and then by the rear end of the slot 9 so that the piston 7 will be located in its firing position. Replacement of pin 10 by pins of different configurations will enable the space 3<SP>11</SP> to be varied so as to vary the power of the tool.