Patent US3870322A successfully refreshed from Google Patents.
US3870322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-tight seals and methods of making them
Assignee: Unisys Group Services Ltd
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Filing: 1973-10-19
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Granted: 1975-03-11
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Expires: 1993-10-19
Abstract
Abstract A method of forming a fluid-tight seal between two surfaces including the steps of forming at the surfaces to be sealed an annular recess for the sealing elements, the recess having a cylindrical outer surface and being wedge-shaped in radial section, tapering inwards, and with a radius curve between the outer and the wedge surfaces, and fitting into the recess sealing elements comprising an O-ring surrounded by a collar of a plastics material which is flexible but does not flow under the conditions in which the seal is required to operate, the relative dimensions being such that the ring and collar are deformed on tightening the seal, and then tightening the surfaces together to compress the O-ring and to deform the collar against the surfaces of the sealing recess.
Inventors
- 👤 John Stephen Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:01
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/021; F16J15/022; F16J15/06; F16J15/062; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A pressure-tight O-ring seal between two surfaces comprising an annular recess having a cylindrical outer wall and a pair of side walls, said outer wall merging by curves into the side walls of the recess, an O-ring in said recess, a thin collar of a plastics material which is flexible but does not flow under the conditions in which the seal is required to operate, said collar surrounding said O-ring, the width of the collar being slightly greater than the axial width of said recess such that said collar is deformed at its contact with the side walls.
Claim 2
Dependent Claim
98 words
A pressure-tight O-ring seal between two surfaces comprising an annular recess having a cylindrical outer wall and a pair of side walls, said outer wall merging by curves into the side walls of the recess, an O-ring in said recess, a thin collar of a plastics material which is flexible but does not flow under the conditions in which the seal is required to operate, said collar surrounding said O-ring, the width of the collar being slightly greater than the axial width of said recess such that said collar is deformed at its contact with the side walls.
Claim 3
Dependent Claim
98 words
A pressure-tight O-ring seal between two surfaces comprising an annular recess having a cylindrical outer wall and a pair of side walls, said outer wall merging by curves into the side walls of the recess, an O-ring in said recess, a thin collar of a plastics material which is flexible but does not flow under the conditions in which the seal is required to operate, said collar surrounding said O-ring, the width of the collar being slightly greater than the axial width of said recess such that said collar is deformed at its contact with the side walls.
Claim 4
Dependent Claim
98 words
A pressure-tight O-ring seal between two surfaces comprising an annular recess having a cylindrical outer wall and a pair of side walls, said outer wall merging by curves into the side walls of the recess, an O-ring in said recess, a thin collar of a plastics material which is flexible but does not flow under the conditions in which the seal is required to operate, said collar surrounding said O-ring, the width of the collar being slightly greater than the axial width of said recess such that said collar is deformed at its contact with the side walls.
Claim 5
Dependent Claim
26 words
A pressure-tight seal according to claim 1 in which the side walls of the recess are conical, the recess tapering towards the axis of the seal.
Claim 6
Dependent Claim
27 words
A pressure-tight seal according to claim 1 in which the recess is formed in two symmetrical halves, one in each of the surfaces to be sealed together.
Claim 7
Dependent Claim
23 words
A pressure-tight seal according to claim 3 in which the outer edge of each half of the recess is slightly rounded or chamfered.
Claim 8
Dependent Claim
24 words
A pressure-tight seal according to claim 4 in which the collar is a light press fit over the O-ring before the seal is assembled.
Claim 9
Dependent Claim
25 words
A pressure-tight seal according to claim 5 in which the collar is formed with a bevel or chamfer on its outer side at both ends.
Claim 10
Dependent Claim
14 words
A pressure-tight seal according to claim 6 in which the collar is of nylon.
Claim 11
Dependent Claim
24 words
A pressure-tight seal according to claim 1 in which the collar is a light press fit over the O-ring before the seal is assembled.
Claim 12
Dependent Claim
25 words
A pressure-tight seal according to claim 1 in which the collar is formed with a bevel or chamfer on its outer side at both ends.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |