GB1239267A - - Google Patents

Abstract

1,239,267. Fastener driving tool. HILTI AG. 7 Dec., 1968, No. 58259/68. Heading B4C. A cartridge actuated fastener driving tool comprises a barrel 2 slidable in housing 1 and having a cartridge chamber 6, a cartridge firing mechanism, a piston 4, cartridges 5 mounted in a disposable plastics strip 17, and an automatic mechanism for advancing the strip to move cartridges successively to the firing position. The strip passes upwardly through a breech member 31 received within the housing and having forwardly extending side portions ending in stop surfaces 16c. When the tool is applied to a work surface, the barrel is moved rearwardly to the position shown in Fig. 3 in which position seals are formed between the chamber and strip and between the strip and the cartridge to be fired and the housing 10 and pin 7 of the firing mechanism are moved by a cocking rod 9 against springs 8a, 8b. Actuation of trigger 15 causes a lever 13 to pivot and to move detent 12 against its spring, thus releasing the firing pin 7. Movement of the barrel 2 away from the position of Fig. 3 allows a rocking lever 18 to pivot under spring bias so as to engage toothed member 18a with a notch in the strip. Return of the barrel to the firing position will cam the lever 18 to the position of Fig. 1 and thereby cause, the next adjacent cartridge to be moved into the firing position. When a cartridge is fired a shoulder 30a on the barrel engages the stop surfaces 16c so as to prevent excessive compression of the strip portion lying between the rear surface of the barrel and the facing surface of the breech member 31.