Patent US3582153A successfully refreshed from Google Patents.
US3582153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure braking systems for vehicles
Assignee: Whitnash PLC
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Filing: 1969-09-03
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Granted: 1971-06-01
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Expires: 1989-09-03
Abstract
Abstract A control device for use in a fluid-pressure braking system of a vehicle to maintain a substantially constant rate of deceleration of the vehicle when the brakes are applied, the control device including a slide valve capable of connecting brake-operating motor cylinders selectively to a source of fluid pressure or to a drain, a spring arranged to be loaded by an operator controlled device to urge the slide valve to a position to connect the said motor cylinders to the pressure source, and a deceleration responsive member caused by deceleration of the vehicle to exert a force, depending on the rate of deceleration, opposing the spring load and therefore tending to connect the motor cylinders to the drain and so reduce the braking in accordance with the rate of deceleration.
Inventors
- 👤 Robert Hazell Pitcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:13
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/72; B60T8/74; B60T13/00; B60T13/10; B60T13/12; B60T13/14; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0923
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A control device for a fluid-pressure braking system including motor cylinders to operate brakes on wheels of a vehicle and a source of fluid pressure connectable to said motor cylinders to apply the brakes, wherein the said control device comprises, in combination, a slide valve adapted to connect the motor cylinders of a fluid-pressure braking system selectively to the pressure source or to the drain of said system, a valve-operating member, resilient means arranged between a movable member of said slide valve and said valve-operating member, said valve-operating member being operative to produce a load in said spring acting to urge the valve movable member to a position in which it connects a pressure inlet to an outlet to the motor cylinders, and a deceleration responsive member arranged to exert on the valve movable member a force depending on the rate of deceleration of a vehicle in which the control device is mounted, opposing the load in the spring.
Claim 2
Dependent Claim
159 words
A control device for a fluid-pressure braking system including motor cylinders to operate brakes on wheels of a vehicle and a source of fluid pressure connectable to said motor cylinders to apply the brakes, wherein the said control device comprises, in combination, a slide valve adapted to connect the motor cylinders of a fluid-pressure braking system selectively to the pressure source or to the drain of said system, a valve-operating member, resilient means arranged between a movable member of said slide valve and said valve-operating member, said valve-operating member being operative to produce a load in said spring acting to urge the valve movable member to a position in which it connects a pressure inlet to an outlet to the motor cylinders, and a deceleration responsive member arranged to exert on the valve movable member a force depending on the rate of deceleration of a vehicle in which the control device is mounted, opposing the load in the spring.
Claim 3
Dependent Claim
16 words
A control device according to claim 1, wherein the deceleration responsive member is a suspended weight.
Claim 4
Dependent Claim
16 words
A control device according to claim 1 or 2, wherein the valve-operating member is a solenoid.
Claim 5
Dependent Claim
20 words
A fluid-pressure braking system including a control device according to claim 1, wherein the braking system is a liquid-pressure system.
Claim 6
Dependent Claim
21 words
A fluid-pressure braking system including a control device according to claim 1 wherein the braking system is a compressed air system.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |