US4172599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-balanced packing
Assignee: Carl Freudenberg KG
•
Filing: 1977-09-08
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Granted: 1979-10-30
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Expires: 1997-09-08
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 19:08
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/322
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 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 stiffening ring and the membrane portion define a cavity therebetween with the sealing element comprising an annularly protruding bead defining one boundary of the cavity and means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed.
Claim 2
Dependent Claim
118 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 stiffening ring and the membrane portion define a cavity therebetween with the sealing element comprising an annularly protruding bead defining one boundary of the cavity and means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed.
Claim 3
Dependent Claim
10 words
Packing ring of claim 1, wherein the cavity is pressure-relieved.
Claim 4
Dependent Claim
17 words
Packing ring of claim 1, wherein the fulcrum means comprises a fulcrum ring embedded in the bead.
Claim 5
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 6
Dependent Claim
40 words
Packing ring of claim 1, further comprising means for stiffening the sealing element on the side facing the medium to be sealed comprising ribs which are aligned with the axis of rotation and which are uniformly distributed over the circumference.
Claim 7
Dependent Claim
12 words
Packing ring of claim 5, wherein the ribs have a triangular profile.
Claim 8
Dependent Claim
114 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 stiffening ring and the membrane portion define a cavity therebetween and means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed and wherein the cavity contains a closed-cell, resilient plastic foam therein.
Claim 9
Dependent Claim
114 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 stiffening ring and the membrane portion define a cavity therebetween and means providing a fulcrum axis centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed and wherein the cavity contains a closed-cell, resilient plastic foam therein.
Claim 10
Dependent Claim
116 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 stiffening ring and the membrane portion 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.
Claim 11
Dependent Claim
116 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 stiffening ring and the membrane portion 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.
Claim 12
Dependent Claim
28 words
Packing ring of claim 8, wherein the reinforcing insert is cemented or welded onto the surface of the sealing element which faces the medium to be sealed in.
Claim 13
Dependent Claim
27 words
Packing ring of claim 8, wherein the reinforcing insert is a wheel-shaped web-like configuration in which the spokes are mechanically stiff and the hoops have elastic properties.
Claim 14
Dependent Claim
18 words
Packing ring of claim 10, wherein the spokes consist of wire and the hoops of a textile material.
References Cited (Backward Citations)
GB544904A
Cited
DE813226C
Cited
US2930643A
Cited
US2998987A
Cited
US3110095A
Cited
GB1195228A
Cited
US3455564A
Cited
US3516679A
Cited
DE1945366A1
Cited
US3854732A
Cited
GB1371341A
Cited
US3727923A
Cited
DE2414634A1
Cited
US3871669A
Cited
US4026563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |