Patent US4663126A successfully refreshed from Google Patents.
Patent US3677137A successfully refreshed from Google Patents.
US3677137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible differential control valve and systems
Assignee: Individual
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Filing: 1970-06-19
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Granted: 1972-07-18
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Expires: 1990-06-19
Abstract
Abstract Unequal loading of two or more fluid motor devices simultaneously imparting movement to a load, is sensed by torsional stress of a torque tube to actuate a differential valve assembly controlling flow of fluid between a pressure source and the fluid motor devices. A valve plunger actuated by the torque tube changes the flow paths within the body of the valve assembly under control of check valves to thereby compensate for unequal loading of the fluid motor devices.
Inventors
- 👤 Orville E Stockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:39
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/212; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30585; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/70; F15B2211/71; F15B2211/76; F15B2211/78
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
169 words
In combination with a source of fluid and a plurality of fluid operated devices, load means connected to said fluid operated devices, sensing means connected to the load means and valve means actuated by said sensing means for differential controlling flow of fluid in opposite directions between the source and the fluid operated devices to equalize movement thereof said valve means including a valve body, a valve element displaceable by the sensing means from a neutral position to compensating positions in which flow is blocked between the source and one of the fluid operated devices, passage means in the valve body conducting fluid through different flow paths intersected by the valve element to differentially restrict flow in response to actuation by the sensing means and unidirectional flow blocking means mounted in said passage means for selecting the flow paths through which fluid is conducted in response to displacement of the valve element from said neutral position whereby cross flow between the fluid operated devices occurs to enhance equalizing movement.
Claim 2
Dependent Claim
169 words
In combination with a source of fluid and a plurality of fluid operated devices, load means connected to said fluid operated devices, sensing means connected to the load means and valve means actuated by said sensing means for differential controlling flow of fluid in opposite directions between the source and the fluid operated devices to equalize movement thereof said valve means including a valve body, a valve element displaceable by the sensing means from a neutral position to compensating positions in which flow is blocked between the source and one of the fluid operated devices, passage means in the valve body conducting fluid through different flow paths intersected by the valve element to differentially restrict flow in response to actuation by the sensing means and unidirectional flow blocking means mounted in said passage means for selecting the flow paths through which fluid is conducted in response to displacement of the valve element from said neutral position whereby cross flow between the fluid operated devices occurs to enhance equalizing movement.
Claim 3
Dependent Claim
59 words
The combination of claim 1 wherein said passage means includes a pair of load ports connected to the fluid operated devices, a supply port and parallel flow conduit portions respectively conducting flow in opposite directions between the supply port and each of the load ports, and a directional control valve connecting the supply port to the source of fluid.
Claim 4
Dependent Claim
25 words
The combination of claim 2 wherein said flow blocking means includes pressure responsive check valves blocking flow in opposite directions through said parallel conduit portions.
Claim 5
Dependent Claim
25 words
The combination of claim 3 wherein flow to and from each of the load ports is respectively conducted by two of the parallel conduit portions.
Claim 6
Dependent Claim
20 words
The combination of claim 3 wherein flow in one direction is conducted through only one of the parallel conduit portions.
Claim 7
Dependent Claim
22 words
The combination of claim 5 wherein a single one of the check valves blocks flow through two of said parallel conduit portions.
Claim 8
Dependent Claim
15 words
The combination of claim 6 wherein said check valves are mounted within the valve element.
Claim 9
Dependent Claim
22 words
The combination of claim 3 wherein a single one of the check valves blocks flow through two of said parallel conduit portions.
Claim 10
Dependent Claim
15 words
The combination of claim 3 wherein said check valves are mounted within the valve element.
Claim 11
Dependent Claim
45 words
The combination of claim 1 wherein said sensing means includes an elongated torque tube, anchoring means connecting the torque tube at one end to the load means, and actuating means connected to the other end of the torque tube for engagement with the valve element.
Claim 12
Dependent Claim
30 words
The combination of claim 10 wherein the load means comprises a frame, a movable member pivotally mounted on the frame and means connecting the fluid operated devices to the member.
Claim 13
Dependent Claim
55 words
The combination of claim 11 including bracket means fixedly mounting the valve body on the member and pivotally mounting the torque tube adjacent thereto at said other end, said one end of the torque tube being fixedly anchored by the anchoring means to the member, said torque tube extending transversely between the fluid operated devices.
Claim 14
Dependent Claim
16 words
The combination of claim 11 wherein said connecting means comprises a pair of operating lever arms.
Claim 15
Dependent Claim
52 words
The combination of claim 13 including bracket means fixedly mounting the valve body on one of the lever arms and pivotally mounting the torque tube adjacent thereto at said other end, said one end of the torque tube being fixedly anchored by the anchoring means to the other of the lever arms.
Claim 16
Dependent Claim
29 words
The combination of claim 1 wherein the load means includes a frame to which the fluid operated devices are anchored, and a platform supported by the fluid operated devices.
Claim 17
Dependent Claim
28 words
The combination of claim 15 wherein said sensing means includes actuating means pivotally mounted on the frame and engageable with the valve for detecting movement of the platform.
Claim 18
Dependent Claim
33 words
The combination of claim 16 including additional valve mEans interconnecting with the source of fluid through said first mentioned valve means for detecting unequal displacement of the platform by the fluid operated devices.
Claim 19
Dependent Claim
54 words
The combination of claim 17 including an elongated torque tube pivotally mounted by the frame at opposite ends, link means connecting the torque tube at said ends to the platform, the valve element associated with said additional valve means being engageable by the link means at one of said ends of the torque tube.
Claim 20
Dependent Claim
164 words
In combination, a frame, a load member movably mounted on the frame, a plurality of fluid operated devices anchored to the frame, means interconnecting the load member with the fluid operated devices at spaced locations, a source of fluid under pressure, directional control means connecting the source to the fluid operated devices for imparting movement to the load member in opposite directions, means connected to the load member for sensing unequal movement of the fluid operated devices during movement of the load member, valve means connected to said fluid operated device for differentially restricting flow between the directional control means and the fluid operated devices in response to engagement by the sensing means to compensate for said unequal loading, passage means connected to the valve means for conducting said flow in opposite directions along different flow paths, and unidirectional flow blocking means responsive to said unequal movement of the fluid operated devices for conducting cross flow therebetween along selected ones of said flow paths.
Claim 21
Dependent Claim
164 words
In combination, a frame, a load member movably mounted on the frame, a plurality of fluid operated devices anchored to the frame, means interconnecting the load member with the fluid operated devices at spaced locations, a source of fluid under pressure, directional control means connecting the source to the fluid operated devices for imparting movement to the load member in opposite directions, means connected to the load member for sensing unequal movement of the fluid operated devices during movement of the load member, valve means connected to said fluid operated device for differentially restricting flow between the directional control means and the fluid operated devices in response to engagement by the sensing means to compensate for said unequal loading, passage means connected to the valve means for conducting said flow in opposite directions along different flow paths, and unidirectional flow blocking means responsive to said unequal movement of the fluid operated devices for conducting cross flow therebetween along selected ones of said flow paths.
Claim 22
Dependent Claim
32 words
The combination of claim 19 wherein said sensing means includes a torque tube connected to the load member, and actuating means displaceable by the torque tube into engagement with the valve means.
Claim 23
Dependent Claim
42 words
The combination of claim 19 wherein said valve means includes a valve body, a valve element displaceable by the sensing means from a neutral position to compensating positions blocking flow between the directional control means and one of the fluid operated devices.
Claim 24
Dependent Claim
158 words
In combination with a pair of fluid operated devices, a source of working fluid and means for sensing unequal loading of the fluid operated devices, a control valve assembly comprising a valve block having a pair of load ports connected to said fluid operated devices and a supply port connected to said source, a single valve element connected to the sensing means, means mounting the valve element within the valve block for displacement from a neutral position by the sensing means to differentially restrict flow of the working fluid between the supply port and said pair of load ports, passage means mounted within the valve block for conducting flow of the working fluid in opposite directions between the supply and load ports along separate and different flow paths, and pressure responsive check valve means mounted in the passage means for unidirectionally conducting cross flow between said load ports in response to unequal loading of the fluid operated devices.
Claim 25
Dependent Claim
158 words
In combination with a pair of fluid operated devices, a source of working fluid and means for sensing unequal loading of the fluid operated devices, a control valve assembly comprising a valve block having a pair of load ports connected to said fluid operated devices and a supply port connected to said source, a single valve element connected to the sensing means, means mounting the valve element within the valve block for displacement from a neutral position by the sensing means to differentially restrict flow of the working fluid between the supply port and said pair of load ports, passage means mounted within the valve block for conducting flow of the working fluid in opposite directions between the supply and load ports along separate and different flow paths, and pressure responsive check valve means mounted in the passage means for unidirectionally conducting cross flow between said load ports in response to unequal loading of the fluid operated devices.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |