Patent US3726609A successfully refreshed from Google Patents.
US3726609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load controller
Assignee: Enerpac Tool Group Corp
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Filing: 1970-01-30
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Granted: 1973-04-10
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Expires: 1990-01-30
Abstract
Abstract A system for regulating the output of a variable delivery hydraulic pump by sensing the load on the pumping members and adjusting the output of the pump in response thereto.
Inventors
- 👤 H Cattanach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:49
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/26; F04B1/28; F04B1/14; F04B1/141; F04B1/146; F04B1/148; F04B49/00; F04B49/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A hydraulic pump system comprising a pump housing having one or more fluid inlet passages and one or more fluid output passages, pumping members between said passages for delivering fluid to said output passages at greater pressures than exist at said inlet passages, first means for varying the fluid output from said pumping members, bearing means within said pump for carrying at least a portion of the forces developed by said pumping members, a source of control fluid under pressure communicated to said bearing means, and second means for generating an output signal through said control fluid in response to the level of said forces applied to said bearing means, said first means being responsive to said output signal to vary the Fluid output from said pumping members.
Claim 2
Dependent Claim
128 words
A hydraulic pump system comprising a pump housing having one or more fluid inlet passages and one or more fluid output passages, pumping members between said passages for delivering fluid to said output passages at greater pressures than exist at said inlet passages, first means for varying the fluid output from said pumping members, bearing means within said pump for carrying at least a portion of the forces developed by said pumping members, a source of control fluid under pressure communicated to said bearing means, and second means for generating an output signal through said control fluid in response to the level of said forces applied to said bearing means, said first means being responsive to said output signal to vary the Fluid output from said pumping members.
Claim 3
Dependent Claim
12 words
The system of claim 1 wherein said control fluid is hydraulic fluid.
Claim 4
Dependent Claim
47 words
The system of claim 1 wherein said pumping members are pistons riding on a swash plate assembly, said bearing means are located between said assembly and said housing and said output signal is generated responsive to the force level between said swash plate means and said housing.
Claim 5
Dependent Claim
67 words
A hydraulic pumping system including a pump having a control means for adjusting the fluid output therefrom in response to hydraulic, signals, the improvement comprising: bearing means within said pump, a source of fluid flow, first means to vary said flow in response to thrust force levels in said bearing means, second means detecting the variations in fluid flow and adjusting said control means in accordance therewith.
Claim 6
Dependent Claim
67 words
A hydraulic pumping system including a pump having a control means for adjusting the fluid output therefrom in response to hydraulic, signals, the improvement comprising: bearing means within said pump, a source of fluid flow, first means to vary said flow in response to thrust force levels in said bearing means, second means detecting the variations in fluid flow and adjusting said control means in accordance therewith.
References Cited (Backward Citations)
US2735407A
Cited
US2298850A
Cited
US2715875A
Cited
US2999463A
Cited
US2937801A
Cited
US3066609A
Cited
US3056358A
Cited
US3143973A
Cited
US3085514A
Cited
GB1004080A
Cited
US3257960A
Cited
US3291067A
Cited
US3411453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |