US3563270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for vehicle-leveling system
Assignee: Schrader Automotive Inc
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Filing: 1969-08-11
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Granted: 1971-02-16
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Expires: 1989-08-11
Abstract
Abstract Valve for vehicle-leveling system includes valve plate apertured to provide precise control of ''''null band'''' as plate moves in its plane. Simple dashpot means delays action of valve until it is clear that out-of-level condition is not from road action.
Inventors
- 👤 Carl B Denny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:53
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/052; B60G17/0523; B60G17/0525; B60G2500/00; B60G2500/20; B60G2500/202; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
235 words
A control valve for a vehicle load leveling system comprising: a. a housing formed with a dashpot cavity and a valve plate cavity spaced laterally of the housing from the dashpot cavity; b. a rotatable drive shaft extending into the housing and intercepting both the dashpot cavity and the valve plate cavity; c. a stiffly yieldable actuating arm connected to an end of the shaft outside the housing; d. a dashpot movable element disposed in the dashpot cavity and connected to the shaft; e. a valve plate mounted radially on the shaft and disposed in the valve plate cavity and having orifice means therethrough; and f. shock absorber port means, fluid supply port means and fluid exhaust port means all disposed in the housing and having ends disposed against the valve plate, with one of the shock absorber port means disposed in axial alignment with the fluid supply port means with the plate inbetween, and the other of the shock absorber port means disposed in axial alignment with the fluid exhaust means with the plate inbetween, whereby when the drive shaft is in one rotary position, the shock absorber port means communicates through the orifice means in the plate with the fluid supply port means and when the drive shaft is in a second rotary position, the shock absorber port means communicates through the orifice means in the plate with the fluid exhaust port means.
Claim 2
Dependent Claim
235 words
A control valve for a vehicle load leveling system comprising: a. a housing formed with a dashpot cavity and a valve plate cavity spaced laterally of the housing from the dashpot cavity; b. a rotatable drive shaft extending into the housing and intercepting both the dashpot cavity and the valve plate cavity; c. a stiffly yieldable actuating arm connected to an end of the shaft outside the housing; d. a dashpot movable element disposed in the dashpot cavity and connected to the shaft; e. a valve plate mounted radially on the shaft and disposed in the valve plate cavity and having orifice means therethrough; and f. shock absorber port means, fluid supply port means and fluid exhaust port means all disposed in the housing and having ends disposed against the valve plate, with one of the shock absorber port means disposed in axial alignment with the fluid supply port means with the plate inbetween, and the other of the shock absorber port means disposed in axial alignment with the fluid exhaust means with the plate inbetween, whereby when the drive shaft is in one rotary position, the shock absorber port means communicates through the orifice means in the plate with the fluid supply port means and when the drive shaft is in a second rotary position, the shock absorber port means communicates through the orifice means in the plate with the fluid exhaust port means.
Claim 3
Dependent Claim
36 words
A control valve as described in claim 1 wherein stop means are provided which permit movable movement of the shaft only from said one rotary position to said other rotary position and back and not beyond.
Claim 4
Dependent Claim
48 words
A control valve as described in claim 1 wherein each of the port means are at the same radius from the drive shaft and the orifice means comprise two openings at the same radius and spaced closer together than the fluid supply port and the fluid exhaust port.
Claim 5
Dependent Claim
34 words
A control valve as described in claim 3 wherein the arcuate difference between the spacing of the supply and exhaust ports and the two openings is less than 20* with respect to the shaft.
Claim 6
Dependent Claim
23 words
A control valve as described in claim 1 wherein the stiffly flexible arm is an interrupted rod coupled by a stiff axial spring.
Claim 7
Dependent Claim
40 words
A control valve as described in claim 1 wherein the stiffly flexible arm is a rigid element rotatably mounted on the shaft and having a stiff-spring-pressed cap the flat end of which works against a flat on the shelf shaft.
Claim 8
Dependent Claim
24 words
A control valve as described in claim 1 wherein the ports each comprise a spring-pressed plastic bushing pressing against the face of the plate.
Claim 9
Dependent Claim
24 words
A control valve as described in claim 1 wherein the fluid exhaust port means communicates to atmosphere through a short-type standard bore valve core.
Claim 10
Dependent Claim
29 words
A control valve as described in claim 1 wherein the housing additionally includes pressure regulator means disposed between the supply port means and a supply external of the housing.
Claim 11
Dependent Claim
39 words
A control valve as described in claim 1 wherein the dashpot movable element is a vane mounted on the shaft and the dashpot cavity is pie slice shaped and the shaft is disposed at the point of the slice.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |