The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1987
Filed:
Feb. 07, 1986
Howa Kogyo Kabushiki Kaisha, Aichi, JP;
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.