Ordnance – Automatic – Gas piston type
Patent
1974-04-26
1976-07-13
Bentley, Stephen C.
Ordnance
Automatic
Gas piston type
89193, F41D 508, F41D 510
Patent
active
039687279
ABSTRACT:
A firearm having structure operated by gas pressure, upon firing of a round, as well as a relief valve for responding to excess pressure. A gas cylinder is fixed to a barrel of the firearm, forwardly of a magazine which extends beneath the barrel, this gas cylinder communicating with the barrel to receive gas under pressure therefrom upon firing of a round. A piston in the gas cylinder is moved rearwardly along the magazine when gas under pressure is received in the cyliner, so as to operate structure automatically in this way, and a guide for the piston extends forwardly from the magazine into the cylinder and is surrounded by the piston so as to guide the latter, the guide having a diameter smaller that the magazine and having a hollow interior which accommodates part of a magazine spring which urges rounds therein rearwardly. A relief valve forms a forward extension of the guide and communicates with the interior of the gas cylinder, forwardly of the piston, as well as with the outer atmosphere for relieving excess gas pressure in the cylinder to the outer atmosphere.
REFERENCES:
patent: 1138377 (1915-05-01), Hammond
patent: 2909101 (1959-10-01), Hillberg
patent: 3261264 (1966-07-01), Wilson
patent: 3420140 (1969-01-01), Beretta
patent: 3779131 (1973-12-01), Kawamura
Bentley Stephen C.
Valmet Oy
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