US3744374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve control apparatus
Assignee: Robert Bosch GmbH
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Filing: 1972-03-13
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Granted: 1973-07-10
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Expires: 1992-03-13
Abstract
Abstract A double-acting control piston for shifting the slider body of an operating valve, is movable in a control cylinder, forming first and second chambers in the control cylinder. A high pressure inlet conduit and a low pressure outlet conduit are selectively connected by distributing valve means with the first and second chambers, and an inlet valve, located in the inlet conduit upstream of the distributing valve means, is opened or closed by electric control means for starting and stopping the control piston means.
Inventors
- 👤 K Schneider
- 👤 H Flaschar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:50
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
Hydraulic valve control apparatus comprising a hydraulic motor including a control cylinder, and a control piston means forming in said control cylinder first and second chambers; inlet conduit means; a source of pressure fluid connected with said inlet conduit means; outlet conduit means communicating with a low pressure area; distributing valve means having a neutral position for connecting said first and second chambers with said outlet conduit means, and a plurality of control positions for connecting said inlet and outlet conduit means with selected chambers of said first and second chambers; and inlet valve means in said inlet conduit means upstream of said distributing valve means having a closed position and an open position in which pressure fluid flows at least partly through said distributing valve means to said first and second chambers for operating said control piston means whereby movement of said control piston means can be started and stopped by operation of said inlet valve means.
Claim 2
Dependent Claim
158 words
Hydraulic valve control apparatus comprising a hydraulic motor including a control cylinder, and a control piston means forming in said control cylinder first and second chambers; inlet conduit means; a source of pressure fluid connected with said inlet conduit means; outlet conduit means communicating with a low pressure area; distributing valve means having a neutral position for connecting said first and second chambers with said outlet conduit means, and a plurality of control positions for connecting said inlet and outlet conduit means with selected chambers of said first and second chambers; and inlet valve means in said inlet conduit means upstream of said distributing valve means having a closed position and an open position in which pressure fluid flows at least partly through said distributing valve means to said first and second chambers for operating said control piston means whereby movement of said control piston means can be started and stopped by operation of said inlet valve means.
Claim 3
Dependent Claim
49 words
Apparatus as claimed in claim 1 wherein said control piston means has effective surfaces of unequal size bounding said first and second Chambers, the smaller effective surface bounding said first chamber; and wherein said inlet conduit means is connected with said first chamber downstream of said inlet valve means.
Claim 4
Dependent Claim
24 words
Apparatus as claimed in claim 2 further comprising spring means in said control cylinder for biassing said control piston means to a neutral position.
Claim 5
Dependent Claim
130 words
Apparatus as claimed in claim 1 wherein each of said distributing valve means and inlet valve means includes electromagnetic operating means; and further comprising an actual position representing device for sensing the actual position of said control piston means, and including means for generating a signal representing the actual position of said control piston means; a desired position representing device settable to a desired position of said control piston means and including means for generating a signal representing the desired position of said control piston means; and electric control means for comparing said signals and connected with said electromagnetic operating means for operating said distributing valve means and said inlet means until the actual position of said control piston means coincides with the desired position of said control piston means.
Claim 6
Dependent Claim
78 words
Apparatus as claimed in claim 1 wherein said inlet valve means has an inlet port and outlet port disconnected in said closed position and connected in said open position; wherein said inlet valve means includes operating means for moving said inlet valve means between said closed and open positions, said operating means including electromagnetic means; wherein said inlet valve means moves to said closed position and open position, respectively, when said electromagnetic means is de-energized and energized, respectively.
Claim 7
Dependent Claim
60 words
Apparatus as claimed in claim 1 wherein said distributing valve means includes first and second distributing valves, each distributing valve having an open position and a closed position, said first distributing valve connecting in said open position said first and second chambers, and said second distributing valve connecting in said open position said second chamber with said outlet conduit means.
Claim 8
Dependent Claim
31 words
Apparatus as claimed in claim 6 wherein each of said first and second distributing valves includes electromagnetic means for moving, when energized, the respective distributing valve to said closed position thereof.
Claim 9
Dependent Claim
23 words
Apparatus as claimed in claim 6 wherein said first chamber has an effective surface smaller than the effective surface of said second chamber.
Claim 10
Dependent Claim
104 words
Apparatus as claimed in claim 1 wherein said distributing valve means includes a valve cylinder having an inlet port connected with said inlet conduit means, an outlet port connected with said outlet conduit means, and two ports connected with each other and with said second chamber, and a distributing valve slide in said valve cylinder having said neutral position and first and second control positions, said distributing valve slide connecting in said neutral position said connected ports with said inlet and outlet conduit means, and connecting in said first and second control positions said second chamber with said inlet and outlet conduit means, respectively.
Claim 11
Dependent Claim
27 words
Apparatus as claimed in claim 9 wherein said distributing valve means include spring means in said valve cylinder urging said distributing valve slide to said neutral position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |