Patent US3837659A successfully refreshed from Google Patents.
US3837659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seals for rotary shafts
Assignee: Individual
•
Filing: 1972-12-04
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Granted: 1974-09-24
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Expires: 1992-12-04
Abstract
Abstract Seals for rotary shafts wherein a surface-to-surface lapped seal is lubricated by injection of lubricant to between the lapped surfaces. Where formation of ice at the seal is likely to occur, the lubricant may be an oily material capable of preventing formation of ice crystals between the lapped sealing surfaces and of removing previously formed ice crystals from between the lapped sealing surfaces, rendering the invention particularly useful in connection with handling of materials such as ethylene and propylene in which ice formation occurs when moisture is present.
Inventors
- 👤 E Moncrief
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:52
CPC Classifications
F; F16; F16N; F16N17/00; F16N17/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
Dynamic shaft seal for use in handling one or more chemicals selected from the group consisting of ethylene and propylene, comprising first and second seal elements flushly engaged one against the other and disposed about a shaft, said first seal element being fixed about an opening of a structure through which said shaft is disposed for rotation, said second seal element being supported about the shaft for rotation therewith, means for biasing said second seal element toward said first seal element, port means through at least one of said first and second seal elements leading to the interface therebetween, and means for introducing lubricant comprising a polyalkylene glycol which prevents ice formation between said seal elements and which acts to eliminate ice already formed between said seal elements through said port means to said interface to lubricate between said first and second seal elements whereby said seal is protected when used under icing conditions.
Claim 2
Dependent Claim
154 words
Dynamic shaft seal for use in handling one or more chemicals selected from the group consisting of ethylene and propylene, comprising first and second seal elements flushly engaged one against the other and disposed about a shaft, said first seal element being fixed about an opening of a structure through which said shaft is disposed for rotation, said second seal element being supported about the shaft for rotation therewith, means for biasing said second seal element toward said first seal element, port means through at least one of said first and second seal elements leading to the interface therebetween, and means for introducing lubricant comprising a polyalkylene glycol which prevents ice formation between said seal elements and which acts to eliminate ice already formed between said seal elements through said port means to said interface to lubricate between said first and second seal elements whereby said seal is protected when used under icing conditions.
Claim 3
Dependent Claim
118 words
The combination of claim 1, said first seal element being a metal ring fixed in an annular recess of said structure surrounding said shaft, said second seal element being a metal ring disposed around said shaft, seal means between said second seal element and the shaft, said biasing means comprising a spring support carried by said shaft and compression spring means acting between said spring support means aNd said second seal element to bias said second seal element against said first seal element, said port means being disposed through said structure and through said first seal element and including annular groove means around the face of said first seal element against which said second seal element is engaged.
References Cited (Backward Citations)
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |