Patent US4472778A successfully refreshed from Google Patents.
US4472778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle anti-skid braking systems
Assignee: ANTI-SKID CONTROLS Ltd 365 BEDWORTH ROAD COVENTRY ENGLAND A BRITISH Co
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Filing: 1982-12-08
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Granted: 1984-09-18
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Expires: 2002-12-08
Abstract
Abstract A vehicle anti-skid braking system, particularly for articulated vehicles, in which a fail-safe device is incorporated to disable the braking-releasing function if a skid signal is generated during the initial period of operation of the braking system before the brakes have been effectively applied.
Inventors
- 👤 John W. Davis
- 👤 Geoffrey A. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:38
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885; G; G05; G05B; G05B9/00; G05B9/02; B60T2270/00; B60T2270/40; B60T2270/402; B60T2270/414
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A trailer brake anti-skid operating system for an articulated vehicle incorporating a tractor and a trailer coupled thereto, said system comprising means to effect application of at least one brake, a wheel speed sensing device, skid control means arranged to be controlled by the wheel speed sensing device so as to be placed in a brake-releasing state when excessive wheel speed deceleration takes place, and monitoring means affording an indication during any period beginning with actuation of the brake-operating pressure has been supplied to cause excessive wheel deceleration to take place, that excessive wheel speed deceleration is present so as to disable the brake-releasing function of the system, wherein the skid control means and monitoring means are electrically operated and arranged to be supplied with electrical power from a brake warning light system on the trailer which receives power only when the brake is actuated by the driver of the tractor to which the trailer is coupled.
Claim 2
Dependent Claim
157 words
A trailer brake anti-skid operating system for an articulated vehicle incorporating a tractor and a trailer coupled thereto, said system comprising means to effect application of at least one brake, a wheel speed sensing device, skid control means arranged to be controlled by the wheel speed sensing device so as to be placed in a brake-releasing state when excessive wheel speed deceleration takes place, and monitoring means affording an indication during any period beginning with actuation of the brake-operating pressure has been supplied to cause excessive wheel deceleration to take place, that excessive wheel speed deceleration is present so as to disable the brake-releasing function of the system, wherein the skid control means and monitoring means are electrically operated and arranged to be supplied with electrical power from a brake warning light system on the trailer which receives power only when the brake is actuated by the driver of the tractor to which the trailer is coupled.
Claim 3
Dependent Claim
46 words
A trailer brake anti-skid operating system according to claim 1, wherein the monitoring means comprises a fail-safe device arranged in response to a spurious skid signal to cut off power from an actuating solenoid of an anti-skid modulation device associated with the trailer brake operating mechanism.
Claim 4
Dependent Claim
35 words
A trailer brake anti-skid operating system according to claim 1, wherein the monitoring means comprises a fail-safe device arranged in response to a spurious skid signal to cut off power from the skid control means.
Claim 5
Dependent Claim
93 words
A trailer brake anti-skid operating system according to claim 1, wherein the monitoring means comprises a fail-safe device incorporating a timer the action of which is initiated by the brake warning light system and a comparator arranged to receive at one input a signal from the timer during a predetermined period after actuation of the braking system and at another input a skid signal indicating operation of the skid control means, the output from the comparator being arranged to disable the skid control means whenever a skid signal arises during the predetermined period.
Claim 6
Dependent Claim
46 words
A trailer brake anti-skid operating system according to claim 4, wherein an integrator circuit is provided in the comparator input associated with the skid signal to ensure that the fail-safe device only operates if the skid signal persists sufficiently to provide a predetermined integrated output level.
Claim 7
Dependent Claim
37 words
A trailer brake anti-skid operating system according to claim 4 wherein a time hold circuit is arranged to disable the fail-safe device for a predetermined period following each initiation of release of the trailer brake operating system.
Claim 8
Dependent Claim
43 words
A trailer brake anti-skid operating system according to claim 4 wherein a prolonged energization integrator is arranged to effect operation of the fail-safe device to disable the skid control means whenever a skid signal persists for a greater period than a predetermined period.
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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |