US3655205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary seal, particularly for oil pumps
Assignee: Danfoss AS
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Filing: 1970-11-03
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Granted: 1972-04-11
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Expires: 1990-11-03
Abstract
Abstract The invention relates to a rotary seal unit of the type used for oil pumps and the like. A plastic backing ring having a tapered surface is nested in a conical recess of a face ring. The taper angle of the tapered surface of the backing ring is larger than the taper angle of the conical recess. A resilient sealing ring is spring biased to force the plastic backing ring into contact with the face ring which in turn is biased into sealing engagement with a fixed sealing surface of a stationary bearing block.
Inventors
- 👤 Jorgen Hartvig Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:35
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F04D29/128; F04C; F04C15/00; F04C15/0003; F04C15/0034; F04C15/0038; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
178 words
A rotary seal unit for a rotatably shaft and casing assembly, comprising, a face ring surrounding said shaft and having an annular sealing surface for slidable and abutting engagement with a fixed surface on said casing, said face ring having a recess with a frustoconically shaped surface, a plastics material backing ring having an external frustoconically shaped surface with a larger taper angle than said face ring frustoconically shaped surface and with a sharp edge at the larger end thereof, said backing ring being disposed in said reCess in surrounding and sealing engagement with said shaft, a resilient sealing ring having a circular section at least partly disposed in said recess and being in surrounding and sealing engagement with said shaft, means including spring means for resiliently biasing said sealing ring into abutting engagement with said backing ring and abutting engagement with said frustoconical surface of said face ring, said backing ring being biased by said sealing ring so that said backing ring sharp edge is in abutting engagement with said frustoconically shaped surface of said face ring.
Claim 2
Dependent Claim
178 words
A rotary seal unit for a rotatably shaft and casing assembly, comprising, a face ring surrounding said shaft and having an annular sealing surface for slidable and abutting engagement with a fixed surface on said casing, said face ring having a recess with a frustoconically shaped surface, a plastics material backing ring having an external frustoconically shaped surface with a larger taper angle than said face ring frustoconically shaped surface and with a sharp edge at the larger end thereof, said backing ring being disposed in said reCess in surrounding and sealing engagement with said shaft, a resilient sealing ring having a circular section at least partly disposed in said recess and being in surrounding and sealing engagement with said shaft, means including spring means for resiliently biasing said sealing ring into abutting engagement with said backing ring and abutting engagement with said frustoconical surface of said face ring, said backing ring being biased by said sealing ring so that said backing ring sharp edge is in abutting engagement with said frustoconically shaped surface of said face ring.
Claim 3
Dependent Claim
39 words
A rotary seal unit according to claim 1 wherein said backing ring has annularly shaped planar end faces each extending in a direction normal to the axis of said shaft and forming a sharp edge immediately surrounding said shaft.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |