US3795294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil operated coupling
Assignee: Humes Ltd
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Filing: 1972-09-11
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Granted: 1974-03-05
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Expires: 1992-09-11
Abstract
Abstract An oil-injection mounting for securing an element with respect to a shaft with which it defines an annular cavity in which fluid pressure selectively applied to a collet fixes the element with respect to the shaft by an interference fit or unfixes them by lubricating self-releasing complementarily tapered surfaces of the collet and element respectively, a source of fluid pressure being connectible to a second part of the cavity, defined by the tapered surfaces, having restricted communication with a first part in which increase of pressure tends to force the surfaces into mating contact, and which first part has a pressure release valve allowing the element and shaft to unfix when the pressure source is turned on after fixing.
Inventors
- 👤 F Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:34
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/04; F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/09; F16D1/091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A fluid injection mounting for releasably securing an element to a shaft or the like, comprising an annular cavity defined by the shaft and an internal wall of the element, a movable tapered collet surrounding the shaft with a close sliding fit and having at least a portion thereof located in said cavity, a first fluid pressure chamber forming a portion of said cavity and defined by the larger end of the tapered collet and part of the internal wall of the element, a second fluid pressure chamber forming another portion of said cavity and defined by the tapered periphery of the collet and a corresponding tapered periphery of the collet and a corresponding tapered part of the internal wall of the element and having restricted communication with the first chamber, means for introducing fluid under pressure to the second chamber to lubricate the same and pressurize the first chamber to force the collet axially along the shaft to extrude fluid from between the respective adjacent surfaces of the shaft, the collet and the member and produce an unlubricated interference fit between the tapered periphery of the collet and the element and a resulting unlubricated force fit between the radially compressed collet and shaft to secure the element to the shaft through the collet, and including means for releasing the pressure in the first chamber to release the element from the collet and shaft.
Claim 2
Dependent Claim
234 words
A fluid injection mounting for releasably securing an element to a shaft or the like, comprising an annular cavity defined by the shaft and an internal wall of the element, a movable tapered collet surrounding the shaft with a close sliding fit and having at least a portion thereof located in said cavity, a first fluid pressure chamber forming a portion of said cavity and defined by the larger end of the tapered collet and part of the internal wall of the element, a second fluid pressure chamber forming another portion of said cavity and defined by the tapered periphery of the collet and a corresponding tapered periphery of the collet and a corresponding tapered part of the internal wall of the element and having restricted communication with the first chamber, means for introducing fluid under pressure to the second chamber to lubricate the same and pressurize the first chamber to force the collet axially along the shaft to extrude fluid from between the respective adjacent surfaces of the shaft, the collet and the member and produce an unlubricated interference fit between the tapered periphery of the collet and the element and a resulting unlubricated force fit between the radially compressed collet and shaft to secure the element to the shaft through the collet, and including means for releasing the pressure in the first chamber to release the element from the collet and 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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |