US3709100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic implement control circuit
Assignee: Caterpillar Inc
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Filing: 1971-06-11
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Granted: 1973-01-09
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Expires: 1991-06-11
Abstract
Abstract A hydraulic circuit for a machine having implements arranged on two portions of the machine, a fluid tank and implement control valve assembly being arranged on each portion of the machine, a pump for drawing fluid from one of the tanks and delivering it to the control valve assemblies with conduits for returning exhaust fluid to either of the tanks, a fluid equalizing line and an air equalizing line interconnecting the two tanks to assure an adequate supply of hydraulic fluid in each tank.
Inventors
- 👤 W Peterson
- 👤 E Wirtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:56
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A hydraulic circuit providing for dump operation of a tilt motor and ejector motor of an ejector bucket assembly for a bucket loader, comprising a source of fluid under pressure, a tilt control valve in communication with the source, a selector valve in communication with the control valve, the selector valve having two operating positions for communicating the control valve with either the tilt motor or lift motor, first sensing means associated with the tilt motor and in communication with the selector valve, the first sensing means being effective to sense a selected operating position of the tilt motor and thereupon reposition the selector valve, and second sensing means associated with the ejector moor and in communication with the selector valve, the second sensing means being effective to sense a selected operating position of the ejector motor and thereupon reposition the selector valve.
Claim 2
Dependent Claim
143 words
A hydraulic circuit providing for dump operation of a tilt motor and ejector motor of an ejector bucket assembly for a bucket loader, comprising a source of fluid under pressure, a tilt control valve in communication with the source, a selector valve in communication with the control valve, the selector valve having two operating positions for communicating the control valve with either the tilt motor or lift motor, first sensing means associated with the tilt motor and in communication with the selector valve, the first sensing means being effective to sense a selected operating position of the tilt motor and thereupon reposition the selector valve, and second sensing means associated with the ejector moor and in communication with the selector valve, the second sensing means being effective to sense a selected operating position of the ejector motor and thereupon reposition the selector valve.
Claim 3
Dependent Claim
38 words
The invention of claim 1 wherein the first sensing means comprises a cam valve arranged for actuation by the tilt motor, the cam valve being in fluid communication with the selector valve and a source of fluid pressure.
Claim 4
Dependent Claim
36 words
The invention of claim 1 wherein the second sensing means comprises a conduit in communication with the ejector motor, the conduit also being in communication with the selector valve by means of a biasing relief valve.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |