Seal for gas springs and the like
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United States of America Patent
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Jul 13, 1999
Issued Date -
N/A
app pub date -
Oct 15, 1996
filing date -
Oct 4, 1996
priority date (Note) -
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Abstract
A seal that is particularly suitable for use in a gas spring and other high pressure hydraulic and pneumatic sealing applications and that minimizes the leakage of relatively high pressure gas and lubricating oil from the rod end of the gas spring or the other applications. The generally annular seal body includes radially inwardly and outwardly facing surfaces and non-concave axial facing surfaces. Lobes for sealing, wiping and directing enhanced forces project radially beyond the planes of the radially inwardly and outwardly facing surfaces. The seal also includes a wiper insert that has a parabolic shaped radially outwardly facing surface and a radially inwardly facing surface, and that is secured in a recess adjacent to the front corner of the seal body's radially inwardly facing surface. When the seal body is compressed for use, the compression induced stresses in the seal body result in the formation of an effective gas and oil seal because, in part, one of the corners of the insert's radially inwardly facing surface is forced against the adjacent surface of the piston rod.
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