Fluid pressure devices
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United States of America Patent
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May 23, 1989
Grant Date -
N/A
app pub date -
Feb 25, 1983
filing date -
Mar 11, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fluid-pressure device for example a bellows-type spring, in which a terminal portion of the spring is compressed between an end member (4) and an annular pressure piece (11) to provide a fluid-tight seal and an additional fluid-tight seal is provided by welding mutually opposed joint surfaces (16,13) of the end member and the annular pressure piece. The end member and the pressure piece may be of thermoplastic material and welded together by ultrasonic or friction welding.
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