Patent US4201052A successfully refreshed from Google Patents.
US4201052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
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Filing: 1979-03-26
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Granted: 1980-05-06
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Expires: 1999-03-26
Abstract
Abstract A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing control for supplying fluid to said actuator. A meter-in valve is provided to which the fluid from the pump is supplied and a pilot controller alternately supplies fluid at pilot pressure to the meter-in valve for controlling the direction and displacement of movement of the meter-in valve and the direction and velocity of the actuator. A pair of lines extends from the meter-in valve to the respective openings of the actuator and a meter-out valve is associated with each line of the actuator for controlling the flow out of the actuator when that line to the actuator does not have pressure fluid from the pump applied thereto. Each meter-out valve is pilot operated by the pilot pressure from the controller.
Inventors
- 👤 Robert H. Breeden
- 👤 Robert G. Farrell
- 👤 Henry D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:16
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/433; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/042; F15B11/044; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/31; F15B2211/3144; F15B2211/32; F15B2211/329; F15B2211/35; F15B2211/351; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41527; F15B2211/42; F15B2211/428; F15B2211/46; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5156; F15B2211/555; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/61; F15B2211/613; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/75
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
126 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller.
Claim 2
Dependent Claim
126 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller.
Claim 3
Dependent Claim
38 words
The hydraulic system set forth in claim 1 including a load drop check valve in each said line operable to permit fluid to flow from the meter-in valve to the actuator when the pressure exceeds a predetermined value.
Claim 4
Dependent Claim
36 words
The hydraulic system set forth in claim 1 including an anti-cavitation valve in each said line to said actuator operable to pass fluid from the tank to said line when the pressure exceeds a predetermined value.
Claim 5
Dependent Claim
33 words
A hydraulic circuit as set forth in claim 1 including a modulating pilot valve associated with each said meter-out valve and operable to modulate the meter-out valve when pressure exceeds a predetermined value.
Claim 6
Dependent Claim
36 words
The hydraulic system set forth in claim 1 wherein the meter-in valve and meter-out valves are so constructed and arranged that each meter-out valve is operable to open before the meter-in valve opens in either direction.
Claim 7
Dependent Claim
37 words
The hydraulic system set forth in claim 1 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve fully opens before the meter-in valve opens to accommodate primarily driving loads.
Claim 8
Dependent Claim
44 words
The hydraulic system set forth in claim 1 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve begins to open before the meter-in valve opens and moves to a gradual opening to accommodate primarily overrunning loads.
Claim 9
Dependent Claim
23 words
The hydraulic system set forth in claim 1 wherein said meter-in valve and meter-out valves are mounted in close proximity to the actuator.
Claim 10
Dependent Claim
21 words
The hydraulic system set forth in claim 1 wherein said meter-in valve and said meter-out valves are mounted on said actuator.
Claim 11
Dependent Claim
29 words
The hydraulic system set forth in claim 1 wherein each said system comprises means for comparing the load pressures therein with an external pressure and determining the highest pressure.
Claim 12
Dependent Claim
17 words
The hydraulic system set forth in claim 1 including a plurality of actuators and substantially identical systems.
Claim 13
Dependent Claim
115 words
For use in hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, and a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pair of lines extending from said meter-in valve to the respective openings of an actuator, a meter-out valve associated with each line to the actuator for controlling the flow out of said actuator, each said meter-out valve being adapted to be pilot operated by the pilot pressure from a pilot controller.
Claim 14
Dependent Claim
115 words
For use in hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, and a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pair of lines extending from said meter-in valve to the respective openings of an actuator, a meter-out valve associated with each line to the actuator for controlling the flow out of said actuator, each said meter-out valve being adapted to be pilot operated by the pilot pressure from a pilot controller.
Claim 15
Dependent Claim
38 words
The hydraulic system set forth in claim 12 including a load drop check valve in each said line operable to permit fluid to flow from the meter-in valve to the actuator when the pressure exceeds a predetermined value.
Claim 16
Dependent Claim
36 words
The hydraulic system set forth in claim 12 including an anti-cavitation valve in each said line to said actuator operable to pass fluid from the tank to said line when the pressure exceeds a predetermined value.
Claim 17
Dependent Claim
33 words
A hydraulic circuit as set forth in claim 12 including a modulating valve associated with each said meter-out valve and operable to modulate the meter-out valve when the pressure exceeds a predetermined value.
Claim 18
Dependent Claim
36 words
The hydraulic system set forth in claim 12 wherein the meter-in valve and meter-out valves are so constructed and arranged that each meter-out valve is operable to open before the meter-in valve opens in either direction.
Claim 19
Dependent Claim
37 words
The hydraulic system set forth in claim 12 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve fully opens before the meter-in valve opens to accommodate primarily driving loads.
Claim 20
Dependent Claim
44 words
The hydraulic system set forth in claim 12 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve begins to open before the meter-in valve opens and moves to a gradual opening to accommodate primarily overrunning loads.
Claim 21
Dependent Claim
26 words
The hydraulic system set forth in claim 12 wherein said meter-in valve and meter-out valves are adapted to be mounted in close proximity to the actuator.
Claim 22
Dependent Claim
24 words
The hydraulic system set forth in claim 12 wherein said meter-in valve and said meter-out valves are adapted to be mounted on said actuator.
Claim 23
Dependent Claim
29 words
The hydraulic system set forth in claim 12 wherein each said system comprises means for comparing the load pressures therein with an external pressure and determining the highest pressure.
Claim 24
Dependent Claim
132 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller.
Claim 25
Dependent Claim
132 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller.
Claim 26
Dependent Claim
38 words
The hydraulic system set forth in claim 22 including a load drop check valve in each said line operable to permit fluid to flow from the meter-in valve to the actuator when the pressure exceeds a predetermined value.
Claim 27
Dependent Claim
36 words
The hydraulic system set forth in claim 22 including an anti-cavitation valve in each said line to said actuator operable to pass fluid from the tank to said line when the pressure exceeds a predetermined value.
Claim 28
Dependent Claim
33 words
A hydraulic circuit as set forth in claim 22 including a modulating pilot valve associated with each said meter-out valve and operable to modulate the meter-out valve when pressure exceeds a predetermined value.
Claim 29
Dependent Claim
36 words
A hydraulic system set forth in claim 22 wherein the meter-in valve and meter-out valves are so constructed and arranged that each meter-out valve is operable to open before the meter-in valve opens in either direction.
Claim 30
Dependent Claim
37 words
A hydraulic system set forth in claim 22 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve fully opens before the meter-in valve opens to accommodate primarily driving loads.
Claim 31
Dependent Claim
44 words
The hydraulic system set forth in claim 22 wherein the meter-in valve and the meter-out valves are so constructed and arranged that each meter-out valve begins to open before the meter-in valve opens and moves to a gradual opening to accommodate primarily overrunning loads.
Claim 32
Dependent Claim
23 words
The hydraulic system set forth in claim 22 wherein said meter-in valve and meter-out valves are mounted in close proximity to the actuator.
Claim 33
Dependent Claim
21 words
The hydraulic system set forth in claim 22 wherein said meter-in valve and said meter-out valves are mounted on said actuator.
Claim 34
Dependent Claim
29 words
The hydraulic system set forth in claim 22 wherein each said system comprises means for comparing the load pressures therein with an external pressure and determining the highest pressure.
Claim 35
Dependent Claim
17 words
The hydraulic system set forth in claim 22 including a plurality of actuators and substantially identical systems.
Claim 36
Dependent Claim
140 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller, said meter-in valve, meter-out valves and associated lines being mounted in a single body.
Claim 37
Dependent Claim
140 words
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pilot controller for alternately supplying fluid at pilot pressure to said meter-in valve for controlling the direction of movement of the meter-in valve, a pair of lines extending from said meter-in valve to said respective openings of said actuator, a meter-out valve associated with each opening of the actuator for controlling the flow out of said actuator, each said meter-out valve being pilot operated by the pilot pressure from said controller, said meter-in valve, meter-out valves and associated lines being mounted in a single body.
Claim 38
Dependent Claim
41 words
The hydraulic system set forth in claim 33 including a load drop check valve in said body in each said line operable to permit fluid to flow from the meter-in valve to the actuator when the pressure exceeds a predetermined value.
Claim 39
Dependent Claim
39 words
The hydraulic system set forth in claim 34 including an anti-cavitation valve in said body in each said line to said actuator operable to pass fluid from the tank to said line when the pressure exceeds a predetermined value.
Claim 40
Dependent Claim
36 words
A hydraulic circuit as set forth in claim 35 including a modulating pilot valve in said body associated with each said meter-out valve and operable to modulate the meter-out valve when pressure exceeds a predetermined value.
Claim 41
Dependent Claim
131 words
For use in a hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, and a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pair of lines extending from said meter-in valve for connection to the respective openings of an actuator, a meter-out valve associated with each line to the actuator for controlling the flow out of said actuator, each said meter-out valve adapted to be pilot operated by the pilot pressure from a pilot controller, said meter-in valve, meter-out valves and associated lines being mounted in a single body.
Claim 42
Dependent Claim
131 words
For use in a hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, and a variable displacement pump with load sensing control for supplying fluid to said actuator, a meter-in valve to which the fluid from the pump is supplied, said valve being pilot controlled, a pair of lines extending from said meter-in valve for connection to the respective openings of an actuator, a meter-out valve associated with each line to the actuator for controlling the flow out of said actuator, each said meter-out valve adapted to be pilot operated by the pilot pressure from a pilot controller, said meter-in valve, meter-out valves and associated lines being mounted in a single body.
Claim 43
Dependent Claim
41 words
The hydraulic system set forth in claim 37 including a load drop check valve in said body in each said line operable to permit fluid to flow from the meter-in valve to the actuator when the pressure exceeds a predetermined value.
Claim 44
Dependent Claim
39 words
The hydraulic system set forth in claim 38 including an anti-cavitation valve in said body in each said line to said actuator operable to pass fluid from the tank to said line when the pressure exceeds a predetermined value.
Claim 45
Dependent Claim
36 words
A hydraulic circuit as set forth in claim 39 including a modulating pilot valve in said body associated with each said meter-out valve and operable to modulate the meter-out valve when pressure exceeds a predetermined value.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |