US3780762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve
Assignee: Deutz Allis Corp
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Filing: 1972-12-22
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Granted: 1973-12-25
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Expires: 1992-12-22
Abstract
Abstract A hydraulic pressure modulated valve for controlling the operation of hydraulic brake and clutches.
Inventors
- 👤 R Matthews
- 👤 R Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:09
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/04; B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
295 words
A hydraulic control system comprising, a first accumulator including a plunger defining a variable volume chamber, resilient means biasing said plunger to minimum volume position, means defining a first pressure modulating chamber adapted for connection to a means defining a high pressure chamber, a first pressure reducing valve selectively connecting said high pressure chamber with said first pressure modulating chamber and said first pressure modulating chamber to sump for discharge of fluid in response to operation of said plunger in said first accumulator, a second accumulator including a plunger defining a variable volume chamber, resilient means biasing said second plunger to a minimum volume position, means defining a second modulating chamber adapted for connection of a second pressure reducing valve selectively connecting said high pressure chamber to said second modulating chamber and said second modulating chamber to sump for discharge of fluid in response to operation of said plunger in said second accumulator, a directional valve, means in said directional valve defining a high pressure chamber, means in said directional valve defining a first accumulator operating chamber connected to said first accumulator and a second accumulator operating chamber connected to said accumulator, a valve element in said directional valve for selectively connecting said high pressure chamber of said directional valve to said first accumulator and to said second accumulator, a control valve including a chamber adapted for connection to a source of pressurized fluid, a control valve element in said control valve for connecting said high pressure chamber in said control valve to said high pressure chamber in said directional valve and selectively connecting said high pressure chamber in said control valve to said high pressure chamber in said modulator, to thereby control pressurization of said modulating chambers responsive to operation of said directional valve.
Claim 2
Dependent Claim
295 words
A hydraulic control system comprising, a first accumulator including a plunger defining a variable volume chamber, resilient means biasing said plunger to minimum volume position, means defining a first pressure modulating chamber adapted for connection to a means defining a high pressure chamber, a first pressure reducing valve selectively connecting said high pressure chamber with said first pressure modulating chamber and said first pressure modulating chamber to sump for discharge of fluid in response to operation of said plunger in said first accumulator, a second accumulator including a plunger defining a variable volume chamber, resilient means biasing said second plunger to a minimum volume position, means defining a second modulating chamber adapted for connection of a second pressure reducing valve selectively connecting said high pressure chamber to said second modulating chamber and said second modulating chamber to sump for discharge of fluid in response to operation of said plunger in said second accumulator, a directional valve, means in said directional valve defining a high pressure chamber, means in said directional valve defining a first accumulator operating chamber connected to said first accumulator and a second accumulator operating chamber connected to said accumulator, a valve element in said directional valve for selectively connecting said high pressure chamber of said directional valve to said first accumulator and to said second accumulator, a control valve including a chamber adapted for connection to a source of pressurized fluid, a control valve element in said control valve for connecting said high pressure chamber in said control valve to said high pressure chamber in said directional valve and selectively connecting said high pressure chamber in said control valve to said high pressure chamber in said modulator, to thereby control pressurization of said modulating chambers responsive to operation of said directional valve.
Claim 3
Dependent Claim
39 words
A hydraulic control system as set forth in claim 1 wherein said directional valve includes a spool adapted for manual operation to selectively connect said high pressure chamber of said directional valve to said first and said second accumulator.
Claim 4
Dependent Claim
86 words
A hydraulic control system as set forth in claim 1 wherein said control valve includes a spool operating within said control valve to selectively control the flow of hydraulic fluid through said valve, means defining a spool biasing pressure chamber on the end of said control valve spool, passage means connecting said high pressure chamber in said control valve to said pressure chamber on the end of said spool to operate said control valve as a variable pressure reducing valve when said control valve is operated.
Claim 5
Dependent Claim
98 words
A hydraulic control system as set forth in claim 1 wherein said control valve includes a spool, means defining a spool biasing pressure chamber on the end of said spooL, means defining passage means in communication with the high pressure chamber and said pressure chamber on the end of said spool, resilient means biasing said spool in the direction toward said pressure chamber on the end of said spool opposing the force of the pressurized fluid in said pressure chamber, manual means for operating said spool of said control valve to thereby control the operation of said system.
Claim 6
Dependent Claim
110 words
A hydraulic control system as set forth in claim 1 wherein said control valve includes a spool reciprocally mounted in said valve, conduit means normally connecting said high pressure chamber in said control valve with the high pressure chamber in said directional valve and the high pressure chamber in said modulator, means defining a sump chamber in said control valve adapted for connection to sump, means defining a brake chamber in said control valve adapted for connection with a brake, manual means for selectively operating said directional valve and said modulating means for selective pressurization of one of said modulating chambers and said brake as said control valve is operated.
Claim 7
Dependent Claim
114 words
A hydraulic control system as set forth in claim 1 wherein said control valve includes a spool, means defining a sump chamber in said control valve adapted for connection to sump, means defining a brake chamber in said control valve adapted for connection to a brake, means defining a spool biasing pressure chamber on the end of said spool, passage means in said spool connecting said high pressure chamber of said control valve with said spool biasing pressure chamber, manual means for operating said spool of said control valve as a variable pressure reducing valve in selectively pressurizing one of said modulating chambers and as a volume metering displacement valve for operating said brake.
Claim 8
Dependent Claim
41 words
A hydraulic control system as set forth in claim 1 wherein said high pressure chamber in said control valve includes a pressure reducing valve for bypassing a portion of the pressurized fluid in said high pressure chamber to an auxiliary circuit.
Claim 9
Dependent Claim
30 words
A hydraulic control system as set forth in claim 1 including a pressure relief valve in said control valve adapted for bypassing a portion of the pressurized fluid to sump.
Claim 10
Dependent Claim
27 words
A hydraulic control system as set forth in claim 1 including manual means for selectively controlling said control valve, manual means for selectively controlling said directional valve.
Claim 11
Dependent Claim
92 words
A hydraulic control system as set forth in claim 1 wherein said directional valve includes manual means for selectively positioning said directional valve for operation of said first or said second accumulator, said control valve includes a spool, means defining a sump chamber adapted for connection to sump in said control valve, means defining a brake chamber adapted for connection to a brake in said control valve, manual means for selectively operating said control valve for operation of said clutch or said brake in response to movement of said control valve spool.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |