Apparatus for the section-wise autofrettage of gun barrels
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United States of America Patent
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Aug 23, 2005
Grant Date -
Jun 3, 2004
app pub date -
Jul 21, 2003
filing date -
Jul 26, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for the section-wise autofrettage of gun barrels (22) by a hydraulic pressure generated inside the barrel. The apparatus (1, 1′, 1';) comprises a mandrel-shaped insert (2, 2′, 2';) inserted into the barrel (22) from the breech opening. A first sealing device (3) is disposed at one end of the insert (2, 2′, 2';), and has a seal packet (5) disposed on a seal seat (4) of the insert (2, 2′, 2';). The seal seat (4) is limited at the front by a threaded sleeve (7) screwed onto the insert (2, 2′, 2';), and an annular intermediate part (8) adjoining the threaded sleeve (7) at the rear. The seal packet (5) includes at least one O-ring (10) held by a shoulder (9) of the mandrel-shaped insert (2, 2′, 2';), and a high-pressure seal (15) formed by two partial rings (13, 14) that are connected to one another by a conical contact surface (16).
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