Breech assembly with expandable mandrel
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United States of America Patent
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Mar 21, 2017
Grant Date -
Mar 16, 2017
app pub date -
Feb 24, 2016
filing date -
Sep 10, 2015
priority date (Note) -
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Abstract
A breech assembly for a gun having a barrel and a barrel extension extending rearwardly from the barrel. The barrel extension includes a throughbore aligned with the barrel as well as a radially inwardly extending annular abutment surface adjacent the rear end of the barrel extension. An elongated bolt is axially slidably received through the barrel extension throughbore when moved to a firing position. An expandable mandrel is mounted to the bolt so that the mandrel surrounds at least a portion of the bolt. An expansion pin is slidably mounted on the bolt and movable between a retracted position in which the mandrel collapses onto the bolt and allows removal of the bolt from the barrel extension, and an inserted position in which at least a portion of the expansion pin is inserted into the mandrel and deflects the mandrel radially outwardly so that a rear end of the mandrel abuts against the abutment surface and locks the bolt to the barrel extension.
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