Ordnance – Automatic – Gas piston-type lock actuator carried by breech block
Patent
1978-06-09
1981-01-27
Bentley, Stephen C.
Ordnance
Automatic
Gas piston-type lock actuator carried by breech block
89132, 89185, F41D 1116
Patent
active
042468302
ABSTRACT:
A firing pin for a firearm, more particularly for a firearm provided with a gas-operated bolt and bolt-carrier, the firing pin being disposed slidably in a longitudinal bore in the bolt. The firing pin of the invention has its shoulder abutment, which limits the stroke of the firing pin, provided with longitudinal apertures, such as slots or holes, preferably disposed at an angle to the longitudinal axis of the firing pin, which provide passageways for the pressure gas operating the bolt-carrier and leaking along the stem of the firing pin. Carbon, or other dirt, is thus prevented from being deposited on the firing pin stem, more particularly at the shoulder abutment. The action of the escaping gas through the inclined apertures further causes the firing pin to rotate each time the bolt-carrier is automatically operated during firing of the firearm, and straight grooves or helical grooves may be formed in the firing pin stem proximate the shoulder abutment to further keep clean the firing pin stem peripheral surface and the internal wall of the bore in the bolt.
REFERENCES:
patent: 624145 (1899-05-01), Young
patent: 760085 (1904-05-01), Stockett
patent: 1795568 (1931-03-01), McCann
patent: 2656636 (1953-10-01), Green
patent: 3013355 (1961-12-01), Weatherby
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