US4281682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportional control type remote-control direction switching control valve device
Assignee: Bosch Corp
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Filing: 1980-06-30
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Granted: 1981-08-04
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Expires: 2000-06-30
Abstract
Abstract A remotely operated, direction switching proportional control device comprises a direction switching control valve which includes a hydraulic actuator, an electromagnetic pressure reducing valve interposed between a liquid chamber of the hydraulic actuator and a hydraulic power source and an electromagnetic open or closed valve interposed between the liquid chamber and a liquid tank. Both the pressure-reducing valve and the open or closed valve can be operated against an electromagnetic force for return movement. The device eliminates the requirement for a piston stroke detector and may be operated by a single electromagnetic coil.
Inventors
- 👤 Yuji Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:01
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T137/87169; Y10T137/87217; Y10T137/87233; Y10T137/877; Y10T137/87708; Y10T137/87772
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A proportional control type remote-control direction switching control valve device comprising: a first valve disposed between a liquid feed passage and an output passage to be opened and closed; a second valve disposed between said output passage and a liquid returning passage to be opened and closed; a first spring in abutment with said first valve to urge said valve toward a closed position; a second spring interposed between said first valve and said second valve, said second spring having a biasing force greater than that of said first spring; and an electromagnetic means in abutment with said second valve and energizable to move said second valve in a closing direction and to move said first valve in an opening direction, and wherein said first and second valves and said first and second springs are disposed in a linear array and said first valve is subjected to the pressure of said output passage so as to be moved thereby in a closing direction.
Claim 2
Dependent Claim
163 words
A proportional control type remote-control direction switching control valve device comprising: a first valve disposed between a liquid feed passage and an output passage to be opened and closed; a second valve disposed between said output passage and a liquid returning passage to be opened and closed; a first spring in abutment with said first valve to urge said valve toward a closed position; a second spring interposed between said first valve and said second valve, said second spring having a biasing force greater than that of said first spring; and an electromagnetic means in abutment with said second valve and energizable to move said second valve in a closing direction and to move said first valve in an opening direction, and wherein said first and second valves and said first and second springs are disposed in a linear array and said first valve is subjected to the pressure of said output passage so as to be moved thereby in a closing direction.
References Cited (Backward Citations)
US3995652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |