US3705728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary shaft seals
Assignee: Meggitt UK Ltd
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Filing: 1970-12-03
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Granted: 1972-12-12
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Expires: 1990-12-03
Abstract
Abstract A rotary shaft seal is of the kind which comprises two sealing rings, the first of which is mounted on and rotates with the shaft and the second of which is mounted on a non-rotatable sleeve. The sleeve surrounds the shaft within a tubular housing which has an open end and the sleeve is sealed to the housing in which it is axially slidable under spring pressure to press the second ring against the conical surface on the first ring to form a seal. The first sealing ring is mounted on the shaft within the housing, the second sealing ring is mounted on the inner end of the sleeve, the spring pressure urges the sleeve inwards into the housing to press the second ring against the conical surface on the first ring and the seal between the sleeve and the housing is at the open outer end of the housing, that is on the side of the second sealing ring remote from the first sealing ring.
Inventors
- 👤 Thomas Ritchie Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
In a rotary shaft seal of the kind including a shaft, a housing surrounding said shaft, a first sealing ring fixedly mounted on said shaft within said housing, a second sealing ring mounted on the inner end of said sleeve within said housing, means fixedly mounting said first sealing ring on said shaft for rotation therewith, a sleeve surrounding said shaft, means axially movably, but non-rotatably, mounting said sleeve in said housing, means fixedly mounting said second sealing ring on the end of said sleeve, means located on the side of said second sealing ring remote from said first sealing ring and forming a seal between said sleeve and said housing, and spring means biasing said sleeve axially inward into said housing to press said second ring against said first ring to form a seal therebetween, the improvement according to which the means forming a seal between said sleeve and housing comprises an annular flange extending around said shaft and said sleeve, means fixing said flange to said housing to form an open outer end thereof, means on said flange defining an internal peripheral groove, and an O-ring in said groove in contact with said sleeve.
Claim 2
Dependent Claim
196 words
In a rotary shaft seal of the kind including a shaft, a housing surrounding said shaft, a first sealing ring fixedly mounted on said shaft within said housing, a second sealing ring mounted on the inner end of said sleeve within said housing, means fixedly mounting said first sealing ring on said shaft for rotation therewith, a sleeve surrounding said shaft, means axially movably, but non-rotatably, mounting said sleeve in said housing, means fixedly mounting said second sealing ring on the end of said sleeve, means located on the side of said second sealing ring remote from said first sealing ring and forming a seal between said sleeve and said housing, and spring means biasing said sleeve axially inward into said housing to press said second ring against said first ring to form a seal therebetween, the improvement according to which the means forming a seal between said sleeve and housing comprises an annular flange extending around said shaft and said sleeve, means fixing said flange to said housing to form an open outer end thereof, means on said flange defining an internal peripheral groove, and an O-ring in said groove in contact with said sleeve.
Claim 3
Dependent Claim
125 words
A rotary shaft seal as claimed in claim 1, comprising a radially projecting flange outside said housing, a plurality of springs forming said spring means and acting on said flange at equi-angularly spaced points therearound and connecting means operatively connecting said flange to said sleeve, said connecting means including a plurality of lugs equi-angularly spaced around said flange and projecting inwards towards said shaft and means defining a plurality of slots in the outer end of said sleeve, said lugs engaging one in each of said slots to transmit pressure of said springs from said flange to said sleeve and to prevent said sleeve from rotating under torque transmitted to it from said first sealing ring through said second sealing ring as said shaft rotates.
Claim 4
Dependent Claim
42 words
A rotary shaft seal as claimed in claim 2, further comprising screw-threaded studs fixed to said housing, and nuts screwed onto said studs, said springs being coiled compression springs surrounding said studs and acting between said radially projecting flange and said nuts.
References Cited (Backward Citations)
US2555932A
Cited
US3109659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |