US3598418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeve seal shape control
Assignee: Individual
•
Filing: 1969-09-30
•
Granted: 1971-08-10
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Expires: 1989-09-30
Abstract
Abstract An apparatus for controlling the curved or contoured ends of sleeve seals by altering the natural belled shape of the seal to thereby obtain the desired seating and sealing pressures.
Inventors
- 👤 John R Ward
- 👤 Harry J Skruch
- 👤 Joseph H Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:38
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
286 words
A fluid seal comprising: a cylinder; a piston slideably mounted in said cylinder and having an annular recess defined between first and second axially spaced and facing shoulders; an annular deformable sealing sleeve having a first undeformed portion disposed within said recess, a deformed second portion and a third unsupported portion in contact with the inside of said cylinder; deforming means in said recess comprising a portion of said second shoulder in contact with the inside of the second deformed portion of said sealing sleeve for deforming said second portion; an annular tubular constraining member having an outside diameter less than the inside diameter of said cylinder and being spaced from the cylinder wall, said member being closely fitted in said recess contacting and surrounding said first portion and contacting a segment of the outside of said deformed second portion for maintaining said deformed second portion in deforming engagement with said deforming means; at least one groove in said recessed portion of said piston providing a passage for high pressure fluid from a high pressure zone to contact the end of said first undeformed portion of said sleeve; and a chamber defined between the outside surface of said constraining member, the inside surface of said cylinder, the first axially facing shoulder, the remaining segment of the outside of said deformed second portion of said third portion, said chamber thus formed being conneCted to said high pressure fluid so that the high pressure fluid bears against said remaining segment of the outside of said deformed second portion to maintain it in deforming engagement with said deforming means and also bears against said third portion to maintain contact of said third portion with the inside of said cylinder.
Claim 2
Dependent Claim
286 words
A fluid seal comprising: a cylinder; a piston slideably mounted in said cylinder and having an annular recess defined between first and second axially spaced and facing shoulders; an annular deformable sealing sleeve having a first undeformed portion disposed within said recess, a deformed second portion and a third unsupported portion in contact with the inside of said cylinder; deforming means in said recess comprising a portion of said second shoulder in contact with the inside of the second deformed portion of said sealing sleeve for deforming said second portion; an annular tubular constraining member having an outside diameter less than the inside diameter of said cylinder and being spaced from the cylinder wall, said member being closely fitted in said recess contacting and surrounding said first portion and contacting a segment of the outside of said deformed second portion for maintaining said deformed second portion in deforming engagement with said deforming means; at least one groove in said recessed portion of said piston providing a passage for high pressure fluid from a high pressure zone to contact the end of said first undeformed portion of said sleeve; and a chamber defined between the outside surface of said constraining member, the inside surface of said cylinder, the first axially facing shoulder, the remaining segment of the outside of said deformed second portion of said third portion, said chamber thus formed being conneCted to said high pressure fluid so that the high pressure fluid bears against said remaining segment of the outside of said deformed second portion to maintain it in deforming engagement with said deforming means and also bears against said third portion to maintain contact of said third portion with the inside of said cylinder.
Claim 3
Dependent Claim
53 words
The fluid seal as defined in claim 1 wherein said deforming means comprises: an annular member having a concaved guide surface, said guide surface extending from a point within said annular recess to a point adjacent to but spaced from said cylinder and curving in a direction away from said high pressure zone.
Claim 4
Dependent Claim
19 words
The fluid seal as defined in claim 1 wherein said annular tubular constraining member comprises a rigid nonmetallic material.
Claim 5
Dependent Claim
14 words
The fluid seal as defined in claim 3 wherein said nonmetallic material comprises polytetrafluoroethylene.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |