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US3767271A
Expired / Lapsed
US
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Anti-locking devices
Assignee: Automobiles Citroen SA
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Filing: 1970-07-14
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Granted: 1973-10-23
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Expires: 1990-07-14
Abstract
Abstract In a motor vehicle an anti-locking braking device associated with the wheel brakes and including supply fluid under pressure connectible to the brake cylinders through a three-way valve which is controlled by a known device for detecting abnormal deceleration of the wheels. The valve is interposed between the supply, the brake cylinders and exhaust and can be operated to connect the suuply to the brake cylinders or the brake cylinders to exhaust. In the exhaust path there is provided a flow-limiter which may be merely a restriction orofice and a damper interposed in the exhaust path between the controlled three-way valve and the flow-limiter. The damper may simply be a piston and cylinder device in communication with the exhaust path, the piston being balanced by the exhausting fluid pressure and a spring.
Inventors
- 👤 A Grosseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:59
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5081; B60T8/5087; B60T8/5093; B60T8/72; B60T8/74
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
An anti-locking braking assembly for a motor vehicle which comprises a source of fluid under pressure; a cylinder coupled to a brake of a wheel of said motor vehicle; a sensing means for detecting abnormal deceleration of said wheel; a valve means controlled by said sensing means for placing said cylinder in fluid communication selectively with said source of fluid under pressure and with an outlet conduit; a fluid flow limiting means for the restrictive but uninterrupted flow of fluid therethrough provided in said outlet conduit; and a fluid accumulator interposed in said outlet conduit between said control valve and said fluid flow limiting means.
Claim 2
Dependent Claim
105 words
An anti-locking braking assembly for a motor vehicle which comprises a source of fluid under pressure; a cylinder coupled to a brake of a wheel of said motor vehicle; a sensing means for detecting abnormal deceleration of said wheel; a valve means controlled by said sensing means for placing said cylinder in fluid communication selectively with said source of fluid under pressure and with an outlet conduit; a fluid flow limiting means for the restrictive but uninterrupted flow of fluid therethrough provided in said outlet conduit; and a fluid accumulator interposed in said outlet conduit between said control valve and said fluid flow limiting means.
Claim 3
Dependent Claim
26 words
An anti-locking braking assembly as defined in claim 1 wherein said fluid flow limiting means is controlled by thE pressure of fluid contained in said cylinder.
Claim 4
Dependent Claim
90 words
An anti-locking braking assembly as defined in claim 2 wherein said fluid flow limiting means is formed by a slide within a body of a control valve with a channel provided therebetween and wherein said slide is maintained in equilibrium by the counter actions of a spring and of the pressure of fluid in an additional conduit in fluid communication with said cylinder and wherein the length of the channel constituting said fluid flow limiting means corresponding to the position of said slide within the body of said control valve.
Claim 5
Dependent Claim
21 words
An anti-locking braking assembly as defined in claim 3 wherein a fluid flow restriction means is provided in said additional conduit.
Claim 6
Dependent Claim
42 words
An anti-locking braking assembly as defined in claim 4 wherein a check valve means is provided in said additional conduit in parallel flow to said fluid flow restriction means to ensure the flow of fluid from said cylinder to said control valve.
Claim 7
Dependent Claim
53 words
An anti-locking braking assembly as defined in claim 1 wherein said fluid accumulator is comprised of a cylinder having an orifice for connection in parallel flow to said outlet conduit, and wherein said cylinder is provided with an air-tight flexible diaphragm isolating a volume of gas from the fluid in the outlet conduit.
Claim 8
Dependent Claim
28 words
An anti-locking braking assembly as defined in claim 1 wherein said fluid accumulator is comprised of a flexible elastic pipe member connected in series with said outlet conduit.
Claim 9
Dependent Claim
83 words
An anti-locking braking assembly as defined in claim 1 wherein said fluid accumulator is comprised of an accumulator cylinder and a piston slidably mounted therein, said accumulator cylinder provided with apertures for serial connection in said outlet conduit, said piston defining separate chambers within said accumulator cylinder, said fluid flow limiting means connecting said chambers, and said chamber being maintained in equilibrium under the opposing action of a spring within a chamber of said cylinder and of the fluid in said outlet conduit.
Claim 10
Dependent Claim
24 words
An anti-locking braking assembly as defined in claim 8 wherein said piston is provided with an orifice which constitutes said fluid flow limiting means.
Claim 11
Dependent Claim
29 words
An anti-locking device as defined in claim 1 wherein said outlet is in fluid communication with a resevoir at atmospheric pressure, and wherein said fluid accumulator is a chamber.
Claim 12
Dependent Claim
74 words
The anti-locking braking assembly as defined in claim 1 wherein said fluid acculmulator is comprised of a cylinder provided with a conduit means for connection of said cylinder in parallel to said outlet conduit and wherein a piston is slidably provided in said cylinder and defines therein two separate chambers, said piston being maintained in equilibrium under the opposing actions of a spring and of the pressure of the fluid in said outlet conduit.
Claim 13
Dependent Claim
104 words
In an anti-locking braking assembly for a vehicle including a source of fluid under pressure, a cylinder coupled to a brake of a wheel of the vehicle, a sensing means for detecting abnormal deceleration of the wheel, a valve means controlled by the sensing means for placing the cylinder in fluid communication selectively with the source of fluid under pressure and an outlet conduit, the improvement comprising a fluid flow limiting means for the restrictive but uninterrupted flow of fluid therethrough provided in said outlet conduit and a fluid accumulator interposted in said outlet between said control valve and said fluid flow limiting means.
Claim 14
Dependent Claim
104 words
In an anti-locking braking assembly for a vehicle including a source of fluid under pressure, a cylinder coupled to a brake of a wheel of the vehicle, a sensing means for detecting abnormal deceleration of the wheel, a valve means controlled by the sensing means for placing the cylinder in fluid communication selectively with the source of fluid under pressure and an outlet conduit, the improvement comprising a fluid flow limiting means for the restrictive but uninterrupted flow of fluid therethrough provided in said outlet conduit and a fluid accumulator interposted in said outlet between said control valve and said fluid flow limiting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |