Gas pressure adjusting device in gas-operated auto-loading firearm
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United States of America Patent
Stats
-
Oct 27, 1987
Grant Date -
N/A
app pub date -
Feb 7, 1986
filing date -
Feb 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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