US3771799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-element fluctuating pressure seal
Assignee: Mather Co
•
Filing: 1971-08-20
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Granted: 1973-11-13
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Expires: 1991-08-20
Abstract
Abstract An annular housing having an outer flanged frusto-conical or substantially obtuse angled cross-section polytetrafluoroethylene lip seal urged into contact with a rotating shaft by a garter spring, and at least one inner polytetrafluoroethylene seal separated from the outer seal in the housing by an annular partition which forms a chamber in the housing between the partition and the outer seal. The inner seal may have either an obtuse angled cross-section and urged into contact with the shaft by its own residual forces, or it may have a substantially rectangular cross-section and be rotated with the shaft and form a face seal with the partition. The housing may also have outside the outer seal a dust lip seal and also one or more gaskets to prevent internal leakage.
Inventors
- 👤 S Sekulich
- 👤 F Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:26
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/002; F16J15/006; F16J15/16; F16J15/34; F16J15/3436; F16J15/3456
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
148 words
A multi-element high or low, constant or fluctuating fluid pressure seal between two relatively moving parts, said seal comprising: a. an annular radially inwardly opening U-shaped channel housing fixed to one of said moving parts, b. an annular partition means fixed in and to said channel of said housing, said partition means having a radial portion that forms two annular chambers in said housing, c. a first polytetrafluroethylene ring seal element fixedly mounted to said housing in one of said annular chambers, said element having an obtuse angled cross-section comprising a Radial portion and a frustoconical portion so that its concave side faces the other chamber in said housing, and d. a second polytetrafluoroethylene ring face type element located in said other chamber in said housing and moveable relative to said housing and said partition means and in face contact with said radial portion of said partition means.
Claim 2
Dependent Claim
148 words
A multi-element high or low, constant or fluctuating fluid pressure seal between two relatively moving parts, said seal comprising: a. an annular radially inwardly opening U-shaped channel housing fixed to one of said moving parts, b. an annular partition means fixed in and to said channel of said housing, said partition means having a radial portion that forms two annular chambers in said housing, c. a first polytetrafluroethylene ring seal element fixedly mounted to said housing in one of said annular chambers, said element having an obtuse angled cross-section comprising a Radial portion and a frustoconical portion so that its concave side faces the other chamber in said housing, and d. a second polytetrafluoroethylene ring face type element located in said other chamber in said housing and moveable relative to said housing and said partition means and in face contact with said radial portion of said partition means.
Claim 3
Dependent Claim
21 words
A seal according to claim 1 including an additional dust type ring seal between said first seal element and said housing.
Claim 4
Dependent Claim
19 words
A seal according to claim 2 including an annular spacer between said dust seal and said first seal element.
Claim 5
Dependent Claim
17 words
A seal according to claim 1 including a gasket between said first seal element and said housing.
Claim 6
Dependent Claim
42 words
A seal according to claim 1 wherein one side of the channel of said housing comprises an axially stepped portion and wherein said partition means comprises a similarly stepped portion telescoping with said stepped portion of said one side of said channel.
Claim 7
Dependent Claim
22 words
A seal according to claim 1 for a rotating shaft wherein said second seal element is attached to rotate with said shaft.
Claim 8
Dependent Claim
20 words
A seal according to claim 6 wherein said second seal element includes a garter spring for urging it radially inwardly.
Claim 9
Dependent Claim
24 words
A seal according to claim 7 wherein said second seal element comprises a groove in its outer circumferential surface for seating said garter spring.
Claim 10
Dependent Claim
39 words
A seal according to claim 8 wherein said groove is V-shaped whereby said garter spring tends to urge the outer radial surface of said second seal element against at least said partition means to provide a face seal therewith.
Claim 11
Dependent Claim
31 words
A seal according to claim 1 having more than one said second ring face type seal element moveable relative to said housing and said partition means and in face contact therewith.
Claim 12
Dependent Claim
106 words
A multi-element high or low, constant or fluctuating fluid pressure seal for a rotating shaft comprising: a. an annular housing, b. an outer polytetrafluoroethylene ring seal element mounted in said housing, said element having an obtuse angled cross-section comprising a radial ring portion and a frusto-conical portion, c. a garter spring located inside the obtuse angle of said outer seal element and against said frusto-conical portion, d. an annular partition means in said housing forming an annular chamber for said garter spring, and e. an inner polytetrafluoroethylene ring seal element attached to and rotating with said shaft and located between said partition means and said housing.
Claim 13
Dependent Claim
106 words
A multi-element high or low, constant or fluctuating fluid pressure seal for a rotating shaft comprising: a. an annular housing, b. an outer polytetrafluoroethylene ring seal element mounted in said housing, said element having an obtuse angled cross-section comprising a radial ring portion and a frusto-conical portion, c. a garter spring located inside the obtuse angle of said outer seal element and against said frusto-conical portion, d. an annular partition means in said housing forming an annular chamber for said garter spring, and e. an inner polytetrafluoroethylene ring seal element attached to and rotating with said shaft and located between said partition means and said housing.
Claim 14
Dependent Claim
20 words
A seal according to claim 11 including an additional dust type seal between said outer seal element and said housing.
Claim 15
Dependent Claim
55 words
A seal according to claim 11 wherein said housing comprises an inner and an outer telescoping annular ring section and said inner section has a radially inwardly stepped portion and wherein said partition means comprises a similarly inwardly stepped portion telescoping with said stepped portion of said inner section for locating said inner seal element.
Claim 16
Dependent Claim
20 words
A seal according to claim 11 wherein said inner seal element includes a garter spring for urging it radially inwardly.
Claim 17
Dependent Claim
24 words
A seal according to claim 14 wherein said inner seal element comprises a groove in its outer circumferential surface for seating said garter spring.
Claim 18
Dependent Claim
39 words
A seal according to claim 15 wherein said groove is V-shaped whereby said garter spring tends to urge the outer radial surface of said inner seal element against at least said partition member to provide a face seal therewith.
Claim 19
Dependent Claim
15 words
A seal according to claim 15 having more than one said inner ring seal element.
Claim 20
Dependent Claim
25 words
A seal according to claim 1 including a garter spring located inside the obtuse angle of said outer seal element and against said frusto-conical portion.
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |