Fastener driving tool

Details Fastener driving tool Fastener driving tool

1982-07-02

1985-01-15

Schran, Donald R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173134, 227 9, B25D 911

Patent

active

044933762

ABSTRACT:
This improved powder-actuated fastener driving tool includes a fastener-driving piston which is slidably housed in a reciprocating barrel. The barrel is contained in a housing member. The tool includes a movable firing pin slidably disposed in a movable breech member. A firing pin pawl is retained in a slot in the breech member to hold the firing pin in a cocked position. The firing pin is held in place in the breech member by a removable C ring disposed in a groove in the firing pin spring guide. Auxiliary gas-venting passages are disposed in the housing tool barrel adjacent a piston pawl return slot formed in the barrel. The tool includes a tapered muzzle bushing which reduces the possibility of air-firing the tool. The inner or breech end of the muzzle bushing is spaced from the muzzle end of the barrel to minimize the possibility of deformation of the muzzle bushing due to piston overdrive. The piston return pawl is biased into a tapered counter bore in the piston pawl return slot so as to hold the barrel against accidental movement to its breech-open position.

REFERENCES:
patent: 4189081 (1980-02-01), Combette et al.
patent: 4332340 (1982-06-01), Harris
patent: 4374567 (1983-02-01), Combette et al.

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