US3713296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system for individually controlling a plurality of hydraulic motors
Assignee: Individual
•
Filing: 1972-02-15
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Granted: 1973-01-30
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Expires: 1992-02-15
Abstract
Abstract A hydraulic system for independently controlling a plurality of individual reversible variable speed hydraulic motors from a common pressure supply source. A plurality of control valves, one for each motor to be controlled, are connected in a closed series circuit with a pump which is operable to recirculate fluid under pressure through the circuit. Each valve, when located in a centered or neutral position, permits all fluid entering the valve inlet to pass directly to the valve outlet. Upon displacement from the neutral position, a portion of the flow into the valve inlet is diverted to the associated motor, passes through the motor and is returned to the valve to rejoin the nondiverted portion of the flow. The magnitude and direction of flow through the motor is dependent upon the magnitude and direction of displacement of the valve from its neutral position. Displacement of a valve in either direction beyond a selected maximum displacement blocks the inlet port of the valve and the resultant increase of pressure at the pump triggers a pressure responsive switch to shut down the pump.
Inventors
- 👤 D Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:00
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/09; A01G25/092; F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/44; F16H61/444
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
258 words
A hydraulic system for independently controlling a plurality of reversible variable speed hydraulic motors comprising a plurality of like control valves each having a pair of control ports connected to one of said motors, an inlet port, and an outlet port, pump means having an intake port and an outlet port and operable to discharge fluid under pressure from said output port, conduit means conneCting said pump means and control valves in a closed series circuit via said inlet and outlet ports with the first valve in said series having its inlet port connected to the pump output port and the last valve in said series having its outlet port connected to the pump intake port, each of said valves having a valve member movable in either direction from a neutral position, first means in said valve member for conducting all fluid entering the valve inlet port to the valve outlet port when said valve member is in said neutral position, and second means on said valve member operable upon displacement of said valve member from said neutral position to divert a portion of the fluid entering the valve inlet port from said outlet port to one of said control ports and to connect the other of said control ports to the valve outlet to establish a flow of diverted fluid from said inlet port through the associated motor to said outlet, the magnitude and direction of said diverted flow varying in accordance with the magnitude and direction of displacement of said valve member from said neutral position.
Claim 2
Dependent Claim
258 words
A hydraulic system for independently controlling a plurality of reversible variable speed hydraulic motors comprising a plurality of like control valves each having a pair of control ports connected to one of said motors, an inlet port, and an outlet port, pump means having an intake port and an outlet port and operable to discharge fluid under pressure from said output port, conduit means conneCting said pump means and control valves in a closed series circuit via said inlet and outlet ports with the first valve in said series having its inlet port connected to the pump output port and the last valve in said series having its outlet port connected to the pump intake port, each of said valves having a valve member movable in either direction from a neutral position, first means in said valve member for conducting all fluid entering the valve inlet port to the valve outlet port when said valve member is in said neutral position, and second means on said valve member operable upon displacement of said valve member from said neutral position to divert a portion of the fluid entering the valve inlet port from said outlet port to one of said control ports and to connect the other of said control ports to the valve outlet to establish a flow of diverted fluid from said inlet port through the associated motor to said outlet, the magnitude and direction of said diverted flow varying in accordance with the magnitude and direction of displacement of said valve member from said neutral position.
Claim 3
Dependent Claim
258 words
A hydraulic system for independently controlling a plurality of reversible variable speed hydraulic motors comprising a plurality of like control valves each having a pair of control ports connected to one of said motors, an inlet port, and an outlet port, pump means having an intake port and an outlet port and operable to discharge fluid under pressure from said output port, conduit means conneCting said pump means and control valves in a closed series circuit via said inlet and outlet ports with the first valve in said series having its inlet port connected to the pump output port and the last valve in said series having its outlet port connected to the pump intake port, each of said valves having a valve member movable in either direction from a neutral position, first means in said valve member for conducting all fluid entering the valve inlet port to the valve outlet port when said valve member is in said neutral position, and second means on said valve member operable upon displacement of said valve member from said neutral position to divert a portion of the fluid entering the valve inlet port from said outlet port to one of said control ports and to connect the other of said control ports to the valve outlet to establish a flow of diverted fluid from said inlet port through the associated motor to said outlet, the magnitude and direction of said diverted flow varying in accordance with the magnitude and direction of displacement of said valve member from said neutral position.
Claim 4
Dependent Claim
258 words
A hydraulic system for independently controlling a plurality of reversible variable speed hydraulic motors comprising a plurality of like control valves each having a pair of control ports connected to one of said motors, an inlet port, and an outlet port, pump means having an intake port and an outlet port and operable to discharge fluid under pressure from said output port, conduit means conneCting said pump means and control valves in a closed series circuit via said inlet and outlet ports with the first valve in said series having its inlet port connected to the pump output port and the last valve in said series having its outlet port connected to the pump intake port, each of said valves having a valve member movable in either direction from a neutral position, first means in said valve member for conducting all fluid entering the valve inlet port to the valve outlet port when said valve member is in said neutral position, and second means on said valve member operable upon displacement of said valve member from said neutral position to divert a portion of the fluid entering the valve inlet port from said outlet port to one of said control ports and to connect the other of said control ports to the valve outlet to establish a flow of diverted fluid from said inlet port through the associated motor to said outlet, the magnitude and direction of said diverted flow varying in accordance with the magnitude and direction of displacement of said valve member from said neutral position.
Claim 5
Dependent Claim
90 words
A system as defined in claim 1 wherein said first means comprises means in said valve member defining an opening in registry with said outlet port when said valve member is in said neutral position, and said second means comprises a pair of annular end elements located to respectively block said control ports when said valve member is in said neutral position whereby upon movement of said valve member away from said neutral position, said outlet port is progressively restricted as said one of said control ports is progressively unblocked.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |