Patent US3897072A successfully refreshed from Google Patents.
US3897072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit ring with connecting membrane
Assignee: John Crane Inc
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Filing: 1973-02-12
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Granted: 1975-07-29
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Expires: 1993-02-12
Abstract
Abstract An endless sealing ring of coherent compliant material is slit to leave a flexible membrane connecting the ends of the ring on opposite sides of the slit. The ring can then be either expanded or contracted depending upon how the slit or combination of slits is directed, to facilitate getting the ring over a cylindrical machine element or through a cylindrical recess in which a groove for the ring is located. The presence of the connecting membrane provides a barrier against leakage through the ring from slit to slit to lessen leakage across the ring. The invention can be applied to piston rings made of plastic material such as nylon or polytetrafluoroethylene as well as elastomeric material.
Inventors
- 👤 Egons Inka
- 👤 Raymond O Shurson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
An endless sealing ring of compliant material having a transversely disposed slit therein extending from one surface thereof toward and spaced from an oppositely disposed surface thereof and forming with said oppositely disposed surface a flexible membrane; at least a portion of said slit having a component of direction parallel to said oppositely disposed surface the portions of the ring adjacent said membrane being relatively movable to bend said membrane upon itself and thereby change the diameter of the ring, whereby to facilitate assembly of the ring into an annular groove.
Claim 2
Dependent Claim
91 words
An endless sealing ring of compliant material having a transversely disposed slit therein extending from one surface thereof toward and spaced from an oppositely disposed surface thereof and forming with said oppositely disposed surface a flexible membrane; at least a portion of said slit having a component of direction parallel to said oppositely disposed surface the portions of the ring adjacent said membrane being relatively movable to bend said membrane upon itself and thereby change the diameter of the ring, whereby to facilitate assembly of the ring into an annular groove.
Claim 3
Dependent Claim
45 words
An endless ring as described in claim 1, said oppositely disposed surface comprising a surface formed by a second slit in said ring commencing from the surface of the ring opposite that of said one surface, and said second slit extending toward said one surface.
Claim 4
Dependent Claim
76 words
An endless sealing ring as described in claim 1, said transversely disposed slit extending radially into said ring from side to side of said ring and then circumferentially of said ring, and said oppositely disposed surface comprising a surface formed by a second slit in said ring disposed substantially parallel with said transversely disposed slit, and said second slit extending into the ring from a surface of said ring opposite said one surface of said ring.
Claim 5
Dependent Claim
29 words
An endless ring as described in claim 3, said second slit extending between the circumferentially extending portion of the transversely disposed slit and said one surface of the ring.
Claim 6
Dependent Claim
35 words
An endless ring as described in claim 3, said second slit extending between the circumferentially extending portion of the transversely disposed slit and the surface of said ring opposite said one surface of said ring.
Claim 7
Dependent Claim
46 words
An endless sealing ring as described in claim 3, the portion of said first-mentioned slit extending toward the opposite surface forming substantially a V in a surface of the ring to interlock the portions of the ring at the slit against relative movement in one direction.
Claim 8
Dependent Claim
36 words
An endless ring as described in claim 1, said slit having a first portion angularly disposed with reference to said one surface of the ring and a second portion extending parallel with said oppositely disposed surface.
Claim 9
Dependent Claim
15 words
An endless ring as described in claim 1, said slit extending radially of said ring.
Claim 10
Dependent Claim
15 words
An endless ring as described in claim 1, said slit extending axially of said ring.
Claim 11
Dependent Claim
49 words
An endless sealing ring as described in claim 1, a second slit extending toward and then parallel with the first-mentioned slit, and a third slit of substantially U-shaped form extending around the ends of the first and second slits and then parallel with the said first and second slits.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |