US3633926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature seals
Assignee: Clarke Chapman Group Ltd
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Filing: 1969-04-28
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Granted: 1972-01-11
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Expires: 1989-04-28
Abstract
Abstract Seals for high-temperature applications have a composite construction including a resilient fibrous ceramic backing layer and a hard surface layer of metal or ceramic supported by the backing layer and providing a sealing face for rubbing contact with the part to be sealed against. Various methods of construction of such seals are described and an arrangement is disclosed in which the density of the backing layer is varied across its thickness to achieve an optimum combination of resiliency with suitable supporting characteristics for the surface layer.
Inventors
- 👤 Waldemar Hryniszak
- 👤 Robert Porteous Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:01
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F28; F28D; F28D19/00; F28D19/04; F28D19/047
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A seal according to claim 1 wherein the backing element has a density that varies with the distance from the surface element, the region of greatest density being closest to the surface element.
Claim 2
Dependent Claim
20 words
A seal according to claim 1 wherein the surface element comprises a metal member formed separately from the backing element.
Claim 3
Dependent Claim
49 words
A seal according to claim 1 wherein auxiliary location pieces are provided on the surface element, said pieces projecting away from the sealing face to engage the backing element so as to prevent relative movement between the surface and backing elements in a plane parallel to the sealing face.
Claim 4
Dependent Claim
37 words
A seal according to claim 4 wherein said location pieces lie on opposite side edges of the backing element section, an inwardly directed lip on at least one piece projecting into its associated backing element side edge.
Claim 5
Dependent Claim
59 words
A seal according to claim 4 wherein a housing or support means carries the surface and backing elements, said means having a sectional width greater than the backing element, said location pieces of the surface element having outwardly directed lips that increase the overall sectional width of the surface element substantially to that of the housing or support means.
Claim 6
Dependent Claim
51 words
A seal according to claim 6 wherein the housing or support means is provided with opposed side surfaces that extend towards the surface element to embrace at least a portion of the depth of the backing element between them, said location pieces being disposed at spaced interruptions of said side surfaces.
Claim 7
Dependent Claim
25 words
A seal according to claim 1 wherein a channel or recess on one face of the backing element provides a seat for the surface element.
Claim 8
Dependent Claim
22 words
A seal according to claim 1 wherein a coating of low-friction material is provided on the sealing face of the surface element.
Claim 9
Dependent Claim
19 words
A seal according to claim 1 wherein the backing element comprises ceramic fibers moulded together with a binding agent.
Claim 10
Dependent Claim
86 words
A seal comprising a composite of (a) a surface element having an exposed working face adapted to effect a sliding seal between it and an independent cooperating member movable with respect thereto and (b) an integral resilient support for resiliently supporting said surface element and for providing a seal for the region enclosed thereby, said resilient support being comprised of a fibrous backing element permanently attached to the opposite face of said surface element, said backing element being principally composed of low bulk density fibrous materials.
Claim 11
Dependent Claim
95 words
A seal comprising a composite of (a) a surface element having an exposed working face adapted to effect a sliding seal between it and an independent cooperating member movable with respect thereto and (b) a fibrous backing element secured to the opposite face of said surface element, said backing element serving as a resilient support for said surface element and as a seal for the region enclosed thereby, the density of the backing element being varied with the distance from the surface element, the region of greatest density being located closest to said surface element.
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |