Patent US3608984A successfully refreshed from Google Patents.
US3608984A
Expired / Lapsed
US
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Restriction device for an antilock brake system
Assignee: US Philips Corp
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Filing: 1969-07-24
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Granted: 1971-09-28
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Expires: 1989-07-24
Abstract
Abstract A restriction device for use within an antilock brake system to control pressurized fluid flow to the wheel brake. A restrictor element is slidably inserted within a section of the pressure line restricting flow therethrough; variations in the extent of penetration of the slide member will determine the degree of restriction.
Inventors
- 👤 Derek Robert Skoyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:43
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/341; B60T8/50; B60T8/5018; B60T8/5025; B60T8/5037
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
An antilock brake system for a wheeled vehicle comprising a fluid pressure line for connection from a fluid pressure source to a wheel brake controlled by the system, an elongate slide member arranged for longitudinal movement into a section of said line, said member being dimensioned to provide between itself and the inner wall of the section a clearance which forms a restricted fluid path in said section, and means for varying the extent of penetration of said slide member into said section during operation of the system to cause variation of the length of said fluid path and thus of the restriction afforded by it and an antilock control valve adapted for actuation in response to an electrical output from a wheel sensor, a connection from the brake to a reservoir which connection is adapted to be opened by said antilock control valve, when the latter is actuated, to allow a fluid to be displaced from said brake through said connection into the reservoir and means for controlling slide member penetration as a function of reservoir fluid volume.
Claim 2
Dependent Claim
179 words
An antilock brake system for a wheeled vehicle comprising a fluid pressure line for connection from a fluid pressure source to a wheel brake controlled by the system, an elongate slide member arranged for longitudinal movement into a section of said line, said member being dimensioned to provide between itself and the inner wall of the section a clearance which forms a restricted fluid path in said section, and means for varying the extent of penetration of said slide member into said section during operation of the system to cause variation of the length of said fluid path and thus of the restriction afforded by it and an antilock control valve adapted for actuation in response to an electrical output from a wheel sensor, a connection from the brake to a reservoir which connection is adapted to be opened by said antilock control valve, when the latter is actuated, to allow a fluid to be displaced from said brake through said connection into the reservoir and means for controlling slide member penetration as a function of reservoir fluid volume.
Claim 3
Dependent Claim
23 words
A system as claimed in claim 1 including a scavenging pump for scavenging fluid in said reservoir back to the fluid pressure source.
Claim 4
Dependent Claim
93 words
A system as claimed in claim 1, including a second elongate slide member which is coupled to the first and is arranged for longitudinal movement in a second section of line at an outlet of said reservoir via which connection is made to said pump, said second elongate slide member being arranged for penetration into said second section of line, or to increase sharply the extent of penetration therein, when the extent of penetration of said first slide member into the first section of line assumes a preferred restriction position for antilock operation.
Claim 5
Dependent Claim
27 words
A system as claimed in claim 3, wherein both slide members are coupled to a piston provided in the reservoir to permit changes of fluid volume therein.
Claim 6
Dependent Claim
62 words
A system as claimed in claim 1 wherein a piston is provided in the reservoir to permit changes of fluid volume therein, and wherein said piston is coupled to or combined with a second piston element of smaller area which is subject to braking fluid pressure acting in such manner as to urge the reservoir piston towards positions of lower reservoir volume.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |