Patent US4003607A successfully refreshed from Google Patents.
US4003607A
Expired / Lapsed
US
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Failure warning and shut-off for anti-skid system
Assignee: SAUER AXLE-SUSPENSIONS Inc
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Filing: 1976-03-24
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Granted: 1977-01-18
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Expires: 1996-03-24
Abstract
Abstract An improvement is provided for use in a wheeled vehicle having anti-skid circuitry associated with the wheels thereof. Fundamentally, the invention comprises a comparator connected to the anti-skid circuitry which products an output signal when anti-skid signals exceed a particular level for a predetermined period of time. The output of the comparator is operative for removing the application of the anti-skid control circuit from the anti-skid valves and for applying in its place a rudimentary anti-skid control circuit comprising a multivibrator of predetermined duty cycle. Thus, under all conditions, braking effort remains with the vehicle operator but under certain conditions is modulated at a predetermined rate by the multivibrator. Provisions are also made for returning the anti-skid system to normal operation in conjunction with the brake system when the output of the anti-skid system drops below the aforesaid particular level.
Inventors
- 👤 James R. Haney
- 👤 Edgar J. Ruof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:40
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
In a brake system for a wheeled vehicle having anti-skid circuitry associated with the wheels thereof for producing and applying anti-skid signals indicative of skidding activity of the wheels to anti-skid valves, the improvement comprising: first circuit means connected to the anti-skid circuitry for receiving the anti-skid signals and producing a first signal if the anti-skid signals exceed a predetermined level; second circuit means connected to said first circuit means and controlled by said first signal for inhibiting the application of the anti-skid signals to the anti-skid valves; and third circuit means connected to and controlled by said second circuit means for applying a pulsating signal to the anti-skid valves upon the inhibiting of the application of the anti-skid signals thereto.
Claim 2
Dependent Claim
121 words
In a brake system for a wheeled vehicle having anti-skid circuitry associated with the wheels thereof for producing and applying anti-skid signals indicative of skidding activity of the wheels to anti-skid valves, the improvement comprising: first circuit means connected to the anti-skid circuitry for receiving the anti-skid signals and producing a first signal if the anti-skid signals exceed a predetermined level; second circuit means connected to said first circuit means and controlled by said first signal for inhibiting the application of the anti-skid signals to the anti-skid valves; and third circuit means connected to and controlled by said second circuit means for applying a pulsating signal to the anti-skid valves upon the inhibiting of the application of the anti-skid signals thereto.
Claim 3
Dependent Claim
35 words
The improvement according to claim 1 wherein said first circuit means includes timing circuit means for inhibiting said first signal until the anti-skid signals have exceeded said predetermined level for a fixed period of time.
Claim 4
Dependent Claim
20 words
The improvement according to claim 1 wherein said first circuit means comprises a comparator interconnected with a time delay circuit.
Claim 5
Dependent Claim
15 words
The improvement according to claim 1 wherein said second circuit means comprises an electro-mechanical relay.
Claim 6
Dependent Claim
14 words
The improvement according to claim 1 wherein said third circuit means comprises a multivibrator.
Claim 7
Dependent Claim
16 words
The improvement according to claim 5 wherein said multivibrator is energized by said second circuit means.
Claim 8
Dependent Claim
34 words
The improvement according to claim 1 which further includes means connected to said second circuit means for providing a visual indication that the application of the anti-skid signals to the anti-skid valves is inhibited.
Claim 9
Dependent Claim
105 words
In a wheeled vehicle having anti-skid circuitry associated with the wheels thereof for producing anti-skid signals indicative of conditions of non-rotation of the wheels and for applying the anti-skid signals to anti-skid valves for the wheels, the improvement comprising: a comparator connected to the anti-skid circuitry and producing an output signal when the anti-skid signals exceed a particular level; a pulse generator; and a switching circuit interconnected between said pulse generator and the anti-skid circuitry and controlled by said comparator to interconnect the anti-skid valves with the pulse generator upon receipt of said output signals and simultaneously disconnect the anti-skid circuitry from the anti-skid valves.
Claim 10
Dependent Claim
105 words
In a wheeled vehicle having anti-skid circuitry associated with the wheels thereof for producing anti-skid signals indicative of conditions of non-rotation of the wheels and for applying the anti-skid signals to anti-skid valves for the wheels, the improvement comprising: a comparator connected to the anti-skid circuitry and producing an output signal when the anti-skid signals exceed a particular level; a pulse generator; and a switching circuit interconnected between said pulse generator and the anti-skid circuitry and controlled by said comparator to interconnect the anti-skid valves with the pulse generator upon receipt of said output signals and simultaneously disconnect the anti-skid circuitry from the anti-skid valves.
Claim 11
Dependent Claim
37 words
The improvement as recited in claim 8 which further includes a timing circuit connected to said comparator for inhibiting said output signal until the anti-skid signals have exceeded said particular level for a fixed period of time.
Claim 12
Dependent Claim
14 words
The improvement as recited in claim 8 wherein said pulse generator comprises a multivibrator.
Claim 13
Dependent Claim
26 words
The improvement as recited in claim 8 wherein said switching circuit includes a relay with the contacts thereof connected to the anti-skid circuitry and pulse generator.
Claim 14
Dependent Claim
50 words
The improvement as recited in claim 8 wherein said output signal from the comparator is removed when the anti-skid signals drop below said particular level and such removal controls said switching circuit to disconnect the anti-skid valves from the pulse generator and reconnect the anti-skid circuitry to the anti-skid valves.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |