Patent US4121503A successfully refreshed from Google Patents.
US4121503A
Expired / Lapsed
US
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Variable displacement pump
Assignee: SUNDTRAND HYDRATEC Ltd
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Filing: 1977-02-11
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Granted: 1978-10-24
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Expires: 1997-02-11
Abstract
Abstract A variable displacement pump comprising a housing, a pair of removable side plates and a swash plate which is so pivoted about the side plates that a load on the swash plate is transmitted to each side plate in a single plane which is substantially parallel to the plane of the side plates.
Inventors
- 👤 Nicholas Antony James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:47
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/2014; F04B1/2064; F04B1/2078
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A variable displacement pump comprising a housing, a pair of removable side plates forming part of the housing, a pair of pins, a pair of support members each of which forms part of one of the side plates and each of which has a recess formed in an upper surface for receiving the whole length of one of the pins, and a swash plate which is adapted to pivot about the pins, the pump being such that a load on the swash plate is transmitted through the pins to the support members and through the support members to the housing, and each pin being subjected solely to in-line compressive loads between its said support member and the swash plate since each pin is supported over its whole length in the recess in its said support member.
Claim 2
Dependent Claim
136 words
A variable displacement pump comprising a housing, a pair of removable side plates forming part of the housing, a pair of pins, a pair of support members each of which forms part of one of the side plates and each of which has a recess formed in an upper surface for receiving the whole length of one of the pins, and a swash plate which is adapted to pivot about the pins, the pump being such that a load on the swash plate is transmitted through the pins to the support members and through the support members to the housing, and each pin being subjected solely to in-line compressive loads between its said support member and the swash plate since each pin is supported over its whole length in the recess in its said support member.
Claim 3
Dependent Claim
41 words
A variable displacement pump according to claim 1 in which the swash plate is a multi-part swash plate having a flat body portion having collars at each end, at least one of said collars being removably attached to the body portion.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |