US4304414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-balanced packing
Assignee: Carl Freudenberg KG
•
Filing: 1979-05-21
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Granted: 1981-12-08
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Expires: 1999-05-21
Abstract
Abstract A packing ring comprises a stiffening ring having an angular profile and an angularly profiled sealing element fastened thereon composed of an elastomeric material and having the configuration of a two-armed lever. The sealing element comprises a membrane portion forming one arm, a sealing lip on the other arm and an annular portion fastened by the membrane to the annular portion of the stiffening ring. The radial portion of the stiffening ring and the membrane portion define a cavity therebetween and a fulcrum axis is provided centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed.
Inventors
- 👤 Hans Forch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:50
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/322
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
Packing ring comprising: a stiffening ring having an angular profile, an angularly profiled sealing element fastened thereon and composed of an elastomeric material and having the configuration of a two-armed lever and comprising a sealing lip on one arm, a membrane portion forming the other arm and an annular portion fastened via the membrane portion to the annular portion of the stiffening ring wherein the radial portion of the sealing element is formed substantially by the membrane and the radial portions of the stiffening ring and the sealing ring define a cavity therebetween, means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed and a reinforcing insert embedded in the tensively stressed portions of the sealing element and configured to flex under forces applied normal to the radial portion of the sealing element to oppose forces parallel thereto.
Claim 2
Dependent Claim
151 words
Packing ring comprising: a stiffening ring having an angular profile, an angularly profiled sealing element fastened thereon and composed of an elastomeric material and having the configuration of a two-armed lever and comprising a sealing lip on one arm, a membrane portion forming the other arm and an annular portion fastened via the membrane portion to the annular portion of the stiffening ring wherein the radial portion of the sealing element is formed substantially by the membrane and the radial portions of the stiffening ring and the sealing ring define a cavity therebetween, means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed and a reinforcing insert embedded in the tensively stressed portions of the sealing element and configured to flex under forces applied normal to the radial portion of the sealing element to oppose forces parallel thereto.
Claim 3
Dependent Claim
10 words
Packing ring of claim 1, wherein the cavity is pressure-relieved.
Claim 4
Dependent Claim
25 words
Packing ring of claim 1, wherein the fulcrum means comprises an annularly protruding fulcrum edge of the stiffening ring defining one boundary of the cavity.
Claim 5
Dependent Claim
15 words
Packing ring of claim 1, wherein the cavity contains a closed-cell, resilient plastic foam thereon.
Claim 6
Dependent Claim
28 words
Packing ring of claim 1, wherein the reinforcing insert is cemented or welded onto the surface of the sealing element which faces the medium to be sealed in.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |