Fastener driving tool
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United States of America Patent
Stats
-
Jan 15, 1985
Grant Date -
N/A
app pub date -
Jul 2, 1982
filing date -
Jul 2, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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