Ordnance – Automatic – Gas piston type
Patent
1986-02-07
1987-10-27
Bentley, Stephen C.
Ordnance
Automatic
Gas piston type
F41D 508
Patent
active
047021462
ABSTRACT:
A gas pressure adjusting device in the gas-operated mechanism of a gas-operated autoloading shotgun is in the form of a valve assembly comprising essentially a valve seat encompassing a stepped valve opening consisting of adjacent opening parts of different diameters, a valve body having first and second pressure-receiving surfaces and first and second sliding contact surfaces respectively fitted slideably in the valve opening parts, and a spring urging the valve body toward and into closed state against the valve seat. This valve assembly operates with a double action wherein the gas pressure tapped from the barrel bore acts initially on only the first pressure-receiving surface of the valve body and, upon exceeding a predetermined pressure, moves the valve body past a point where it acts also on the second pressure-receiving surface thereby to be released into the outside air. Thus, a low gas pressure produced by a low-base load is not released and positively operates the breech bolt, while a high pressure produced by a high-base load is partly released to prevent excessive impact on moving parts of the shotgun.
REFERENCES:
patent: 785974 (1905-03-01), McClean
patent: 2987967 (1961-06-01), Wild et al.
patent: 3020807 (1962-02-01), Hailston et al.
patent: 3127812 (1964-04-01), Into et al.
Ikeda Kouhei
Iwata Kozo
Masaki Hisayoshi
Bentley Stephen C.
Howa Kogyo Kabushiki Kaisha
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