Patent US3768375A successfully refreshed from Google Patents.
US3768375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for a hydraulic consumer motor
Assignee: Robert Bosch GmbH
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Filing: 1972-09-15
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Granted: 1973-10-30
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Expires: 1992-09-15
Abstract
Abstract A control apparatus, which controls the operation of a hydraulic consumer motor, has a control valve for either connecting a pump with the consumer motor, or for connecting an idling conduit with the outlet and return conduits of the pump for obtaining idle circulation. A pressure fluid accumulator is connected by an accumulator conduit with the idling conduit and outlet conduit, and a pressure responsive valve in the accumulator conduit closes the same at a predetermined pressure, or charges the accumulator when its pressure is too low. A supply conduit connects the accumulator conduit with a hydraulic shifting motor by which the control valve is shifted between an idling position, and an operative position controlling the consumer motor. The hydraulic shifting motor is connected by a supply conduit with the accumulator, and operated by electromagnetically operated valves.
Inventors
- 👤 H Flaschar
- 👤 K Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:28
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/027; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
203 words
Control apparatus for a hydraulic consumer motor comprising a consumer motor; pump means including outlet conduit means and return conduit means; idling conduit means between said outlet conduit means and said return conduit means; at least one control valve means in said idling conduit means having an idling position in which said idling conduit means connects said outlet conduit means and said return conduit means, and at least one control position connecting said outlet and return conduit means with said consumer motor and interrupting said idling conduit means; a pressure fluid accumulator; accumulator conduit means connecting said accumulator with said idling conduit means and with said outlet conduit means upstream of said control valve means; pressure responsive valve means in said accumulator conduit means for closing the same at a predetermined pressure and for charging said accumulator when the pressure in said accumulator is below said predetermined pressure; hydraulic shifting motor means for shifting said control valve means between said idling position and said control position; supply conduit means connecting said accumulator conduit means downstream of said pressure responsive valve means with said hydraulic shifting motor means; and operating valve means in said supply conduit means for operating said hydraulic shifting motor means.
Claim 2
Dependent Claim
203 words
Control apparatus for a hydraulic consumer motor comprising a consumer motor; pump means including outlet conduit means and return conduit means; idling conduit means between said outlet conduit means and said return conduit means; at least one control valve means in said idling conduit means having an idling position in which said idling conduit means connects said outlet conduit means and said return conduit means, and at least one control position connecting said outlet and return conduit means with said consumer motor and interrupting said idling conduit means; a pressure fluid accumulator; accumulator conduit means connecting said accumulator with said idling conduit means and with said outlet conduit means upstream of said control valve means; pressure responsive valve means in said accumulator conduit means for closing the same at a predetermined pressure and for charging said accumulator when the pressure in said accumulator is below said predetermined pressure; hydraulic shifting motor means for shifting said control valve means between said idling position and said control position; supply conduit means connecting said accumulator conduit means downstream of said pressure responsive valve means with said hydraulic shifting motor means; and operating valve means in said supply conduit means for operating said hydraulic shifting motor means.
Claim 3
Dependent Claim
27 words
Control apparatus as claimed in claim 1 further comprising a check valve in said accumulator conduit means for blocking flow from said accumulator into said idling conduit.
Claim 4
Dependent Claim
93 words
Control apparatus as claimed in claim 1, further comprising control conduit means connecting said idling conduit means with said return conduit means upstream of said control valve means; a throttle in said control conduit means; a pressure controlling valve downstream of said throttle in said control conduit means and operated depending on the pressure in said accumulator, said pressure controlling valve controlling the pressure in said control conduit means by opening and closing the same; and a switching valve in said idling conduit means having a chamber connected with said control conduit means.
Claim 5
Dependent Claim
60 words
Control apparatus as claimed in claim 3 wherein said pressure controlling valve includes a control piston and a spring urging said control piston to a position of rest interrupting the flow in said control conduit means, and being moved by high pressure from said accumulator to an operative position opening said control conduit means against the action of said spring.
Claim 6
Dependent Claim
81 words
Control apparatus as claimed in claim 4, wherein said switching valve means includes a hollow valve slide inside of which said throttle is formed, a spring located in said chamber and urging said slide to a normal position in which said valve slide interrupts the flow in said idling conduit means at least paRtly, said valve slide having a plurality of working positions for opening said idling conduit means to different degrees, without influencing the communication with said control conduit means.
Claim 7
Dependent Claim
22 words
Control apparatus as claimed in claim 5 further comprising an adjustable stop on which said valve slide abuts in said normal position.
Claim 8
Dependent Claim
82 words
Control apparatus as claimed in claim 5 further comprising a cylinder, a piston in said cylinder forming a chamber on one side of said piston, and another chamber on the other side of said piston and a measuring spring located in said other chamber, said piston having on said other side a piston rod projecting out of said other chamber in said cylinder and having a free end spaced from said valve slide when said piston is in a position of rest.
Claim 9
Dependent Claim
46 words
Control apparatus as claimed in claim 7 wherein said other chamber communicates with said idling conduit means downstream of said switching valve means, and wherein said chamber on said one side of said piston communicates with said idling conduit means upstream of said switching valve means.
Claim 10
Dependent Claim
39 words
Control apparatus as claimed in claim 7 wherein said other chamber communicates with said return conduit means; and wherein said chamber on said one side of said piston communicates with said idling conduit means upstream of said switching valve.
Claim 11
Dependent Claim
36 words
Control apparatus as claimed in claim 7 wherein said valve slide is displaced by said piston to a position in which said valve slide closes said control conduit means and fully opens said idling conduit means.
Claim 12
Dependent Claim
124 words
Control apparatus as claimed in claim 1 wherein said hydraulic shifting motor means includes a hydraulic cylinder, a shifting piston movable in said hydraulic cylinder between at least two positions and including means connected with said control valve means for moving the same between said idling and control positions, said shifting piston dividing said hydraulic cylinder into a first chamber having a small effective surface, and a second chamber having a larger effective surface; and wherein said operating valve means includes a first magnetically operated valve for connecting said first chamber with said supply conduit means, a second magnetically operated valve for connecting said first and second chambers, and a third magnetically operated valve for connecting said second chamber with said return conduit means.
References Cited (Backward Citations)
US3604679A
Cited
US3631762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |