US3589130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydraulic remote control of hydraulic valves
Assignee: Robert Bosch GmbH
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Filing: 1969-10-30
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Granted: 1971-06-29
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Expires: 1989-10-30
Abstract
Abstract An arrangement for controlling remotely hydraulic valves located between a variable displacement pump and a load supplied from the pump. The valve has a control slider the position of which is indicated through a signal generator on the slider. Control levers are also coupled to the slider and the position of these levers is indicated through another signal generator coupled to the levers. A control unit connected to the signal generators, compares their signal outputs and actuates electrohydraulic positioning means for controlling the pump flow as a function of the deflection of the control levers.
Inventors
- 👤 Heinz Flaschar
- 👤 Wilhelm Weigert
- 👤 Walter Werner
- 👤 Manfred Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:19
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
180 words
An arrangement for remote control of valves comprising, in combination, variable displacement pump means for pumping fluid under pressure; a load for receiving said fluid pumped by said pump means; valve means with control slider connected between said pump means and said load for controlling the flow of said fluid to said load; first signal generator means at said control slider of said valve means for providing a signal dependent upon the position of said control slider; control lever means coupled to said control slider; second signal generator means at said control lever means for providing a signal dependent upon the position of said control lever means; control means connected to said first and second signal generating means and comparing the signals therefrom; first electrohydraulic positioning means operatively coupled to said control slider for controlling the position of said control slider as a function of the deflection of said control lever means and second electrohydraulic positioning means operatively coupled to said pump means and said control means for controlling said pump dependent upon the deflection of said control lever means.
Claim 2
Dependent Claim
180 words
An arrangement for remote control of valves comprising, in combination, variable displacement pump means for pumping fluid under pressure; a load for receiving said fluid pumped by said pump means; valve means with control slider connected between said pump means and said load for controlling the flow of said fluid to said load; first signal generator means at said control slider of said valve means for providing a signal dependent upon the position of said control slider; control lever means coupled to said control slider; second signal generator means at said control lever means for providing a signal dependent upon the position of said control lever means; control means connected to said first and second signal generating means and comparing the signals therefrom; first electrohydraulic positioning means operatively coupled to said control slider for controlling the position of said control slider as a function of the deflection of said control lever means and second electrohydraulic positioning means operatively coupled to said pump means and said control means for controlling said pump dependent upon the deflection of said control lever means.
Claim 3
Dependent Claim
88 words
The arrangement as defined in claim 1 including third signal generating means at said pump means and providing a signal dependent upon the stroke of said pump means, said third signal generating means being connected to said control means for comparing the signal from said third signal generating means with the signal from said first and second signal generating means, said control means being operatively connected with said second electrohydraulic positioning means for controlling the stroke of said pump means dependent upon the deflection of said control lever.
Claim 4
Dependent Claim
30 words
The arrangement as defined in claim 1 wherein said second electrohydraulic positioning means comprises a piston movable by said fluid under pressure and a pressure space communicating with said piston.
Claim 5
Dependent Claim
50 words
The arrangement as defined in claim 3 including a first electromagnetic actuated valve with pressure channel communicating with said valve; and a second electromagnetically actuated valve with return flow channel, said pressure space communicating with said pressure channel and said return flow channel through said first and second electromagnetic valves.
Claim 6
Dependent Claim
28 words
The arrangement as defined in claim 4 including an electromagnetically controlled switching valve in parallel with said second electrohydraulic positioning means and operatively connected with said control means.
Claim 7
Dependent Claim
16 words
The arrangement as defined in claim 4 including auxiliary channel means connected with said pressure channel.
Claim 8
Dependent Claim
31 words
The arrangement as defined in claim 6 including pressure retaining valve means in said pressure channel and connected to the junction of said switching valve and said second hydraulic positioning means.
Claim 9
Dependent Claim
21 words
The arrangement as defined in claim 4 including feed pump means; and feed channel means connected with said auxiliary channel means.
Claim 10
Dependent Claim
69 words
The arrangement as defined in claim 8 including pressure limiting valve means communicating with said feed channel means for limiting the pressure or fluid therein. 10 The arrangement as defined in claim 1 wherein said second electrohydraulic positioning means comprises a differential piston subjectable to said fluid under pressure; a piston space communicating with said piston head; and spring means for maintaining said differential piston in its zero position.
Claim 11
Dependent Claim
85 words
The arrangement as defined in claim 10 including first electromagnetic valve means with return flow line means; second electromagnetic valve means communicating with said piston through a space lying on the opposite side of said piston from said piston space, said piston space communicating with said return flow line means and said space lying on said opposite side of said piston through said first and second electromagnetic valves; and further channel means connecting said space lying opposite to said piston space with said pump means.
Claim 12
Dependent Claim
29 words
The arrangement as defined in claim 1 including return flow line means communicating with said load and said electrohydraulic positioning means and providing return flow path for said fluid.
Claim 13
Dependent Claim
59 words
The arrangement as defined in claim 2 wherein said control lever means comprises a plurality of control levers, said second signal generating means being common to all said control levers and being comparable with said third signal generating means, said second signal generating means providing a signal representative of the maximum deflection of a control lever from neutral position.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |