Patent US4382364A successfully refreshed from Google Patents.
US4382364A
Expired / Lapsed
US
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Hydraulic braking systems for vehicles
Assignee: Girling Ltd
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Filing: 1980-12-04
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Granted: 1983-05-10
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Expires: 2000-12-04
Abstract
Abstract In a power braking system for a vehicle a supply of fluid from a power source is utilized to augment the output pressure to be supplied to a brake from a pedal-operated brake control valve assembly. The power source comprises a source of hydraulic fluid of a type different from that which is supplied to the brake from the control valve assembly, and the fluid under pressure from the pressure source is supplied to at least one pressure converter which is adapted to pressurize hydraulic fluid in a sub-system to augment the output pressure from the control valve assembly. The sub-system is provided with hydraulic fluid of a type different from that of the power source, and an hydraulic accumulator is incorporated in a line between the pressure converter and the control valve assembly.
Inventors
- 👤 Alfred W. Thomas
- 👤 Anthony W. Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:41
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A power system for a vehicle comprising at least one pressure converter which takes energy from one system at a first pressure and converts said energy into energy at a second pressure in a second system, said pressure converter being operative when said one system is operative, a power source of hydraulic pressure fluid for supply to said pressure converter, a sub-system provided with hydraulic fluid which is adapted to be pressurised by said pressure converter, said fluid supplied to said converter by said power source being separated from said hydraulic fluid of said sub-system by said pressure converter, a booster operable in response to pressure in said sub-system, for providing an output pressure, a master cylinder to operate ancillary equipment, said output pressure being augmented by said pressure converter by means of a force generated by said booster in response to said pressure in said sub-system, and an hydraulic accumulator incorporated in a line between said converter and said booster.
Claim 2
Dependent Claim
161 words
A power system for a vehicle comprising at least one pressure converter which takes energy from one system at a first pressure and converts said energy into energy at a second pressure in a second system, said pressure converter being operative when said one system is operative, a power source of hydraulic pressure fluid for supply to said pressure converter, a sub-system provided with hydraulic fluid which is adapted to be pressurised by said pressure converter, said fluid supplied to said converter by said power source being separated from said hydraulic fluid of said sub-system by said pressure converter, a booster operable in response to pressure in said sub-system, for providing an output pressure, a master cylinder to operate ancillary equipment, said output pressure being augmented by said pressure converter by means of a force generated by said booster in response to said pressure in said sub-system, and an hydraulic accumulator incorporated in a line between said converter and said booster.
Claim 3
Dependent Claim
17 words
A power system as claimed in claim 1, wherein said sub-system comprises brake fluid as defined herein.
Claim 4
Dependent Claim
16 words
A power system as claimed in claim 1, wherein said pressure converter embodies a pressure amplifier.
Claim 5
Dependent Claim
14 words
A power system as claimed in claim 1, wherein two pressure converters are provided.
Claim 6
Dependent Claim
21 words
A power system as claimed in claim 4, wherein said two pressure converters are arranged in tandem and are interconnected hydraulically.
Claim 7
Dependent Claim
17 words
A power system as claimed in claim 1, wherein said power source is provided by a pump.
Claim 8
Dependent Claim
39 words
A power system as claimed in claim 1, wherein said hydraulic pressure fluid of said power source is of a first type, and said hydraulic fluid of said sub-system is of a second type different from said first type.
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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) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |