Patent US3556542A successfully refreshed from Google Patents.
US3556542A
Expired / Lapsed
US
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Trim-correcting arrangement for vehicles with hydropneumatic suspension
Assignee: IND DEV CO ESTABLISHMENTS
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Filing: 1968-06-19
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Granted: 1971-01-19
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Expires: 1988-06-19
Abstract
Abstract Two hydropneumatic suspension units, acting upon respective wheel mounts on opposite sides of a vehicle frame, are connected in a hydraulic circuit including a pair of contacting valve discs on confronting ends of a pair of torsion shafts which are mechanically linked with the two wheel mounts so as to rotate upon a raising or lowering of the corresponding wheel relative to the vehicle frame. The contacting disc faces have inlet and outlet ports, respectively connected to the high-pressure and low-pressure sides of a fluid supply system, and control ports leading to the oil chambers of the associated suspension units; upon relative rotation of the shafts in one sense of or the other, a compensating pressure differential is generated in these oil chambers to restore the normal attitude of the vehicle.
Inventors
- 👤 Rene Capgras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:12
CPC Classifications
B; B60; B60G; B60G11/00; B60G11/32; B60G11/48; B60G11/64; B60G17/00; B60G17/02; B60G17/033; B60G21/00; B60G21/02; B60G21/026; B60G21/04; B60G21/05; B60G21/055; B60G21/0551; B60G21/0553; B60G2202/00; B60G2202/10; B60G2202/13; B60G2202/135; B60G2202/15; B60G2202/154; B60G2202/20; B60G2202/22; B60G2202/40; B60G2202/442
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
178 words
A trim-correcting system for a vehicle having a pair of wheels on opposite sides of a frame, comprising: two supports, one for each wheel, independently movable with reference to said frame in a vertical direction; a pair of fluid-actuated suspension units respectively bearing upon saId supports in a manner tending to elevate said frame with reference to the corresponding wheels; a source of high-pressure fluid for said units; a pair of coaxial shafts rotatably journaled on said frame and mechanically linked with said supports, respectively, for independent rotation in response to vertical displacement of the respective wheels relative to said frame; a pair of control elements confrontingly mounted on juxtaposed ends of said shafts for rotary entrainment thereby; and distributor means including said control elements establishing a fluid path between said source and said suspension units, in response to relative rotation of said shafts, for generating in said units a pressure differential tending to level said frame with reference to said wheels, thereby restoring said control elements to a normal relative position with elimination of said pressure differential.
Claim 2
Dependent Claim
178 words
A trim-correcting system for a vehicle having a pair of wheels on opposite sides of a frame, comprising: two supports, one for each wheel, independently movable with reference to said frame in a vertical direction; a pair of fluid-actuated suspension units respectively bearing upon saId supports in a manner tending to elevate said frame with reference to the corresponding wheels; a source of high-pressure fluid for said units; a pair of coaxial shafts rotatably journaled on said frame and mechanically linked with said supports, respectively, for independent rotation in response to vertical displacement of the respective wheels relative to said frame; a pair of control elements confrontingly mounted on juxtaposed ends of said shafts for rotary entrainment thereby; and distributor means including said control elements establishing a fluid path between said source and said suspension units, in response to relative rotation of said shafts, for generating in said units a pressure differential tending to level said frame with reference to said wheels, thereby restoring said control elements to a normal relative position with elimination of said pressure differential.
Claim 3
Dependent Claim
63 words
A system as defined in claim 1 wherein said control elements are a pair of valve discs having contacting faces provided with eccentrically positioned ports including inlet ports communicating with said source, outlet ports for the discharge of said fluid, and control ports leading to said suspension units, corresponding ports on said contacting faces registering with one another in said normal relative position.
Claim 4
Dependent Claim
28 words
A system as defined in claim 2 wherein, on each of said faces, an inlet port and a control port are flanked by a pair of outlet ports.
Claim 5
Dependent Claim
35 words
A system as defined in claim 3 wherein said inlet port is angularly equispaced from said pair of outlet ports, said control port being interposed between said inlet port and one of said outlet ports.
Claim 6
Dependent Claim
42 words
A system as defined in claim 2 wherein each of said suspension units includes a piston cylinder with a flexible membrane dividing the interior thereof into a hydraulic chamber and a gas cushion, said control ports being connected with said hydraulic chambers.
References Cited (Backward Citations)
US2920636A
Cited
US3194581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |