Patent US3829169A successfully refreshed from Google Patents.
US3829169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid brake control system for vehicles
Assignee: Aisin Corp
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Filing: 1973-05-04
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Granted: 1974-08-13
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Expires: 1993-05-04
Abstract
Abstract Anti-skid brake control system for vehicles including a hydraulic braking circuit and anti-skid actuator driven by pump powered hydraulic pressure for controlling the braking pressure in response to an electric signal indicating a wheel rotational condition. The actuator includes a cut off valve for ON-OFF controlling of the braking circuit, a hydraulic pressure reducing piston operatively connected to the cut off valve for reducing the hydraulic brake pressure of the circuit, and an electromagnetic valve which is actuated to change over the pump powered hydraulic pressure in response to the skid sensing signal whereby, the actuator includes a further electro-magnetic valve which is to be actuated as a safety valve in case the skid sensing signal is generated for an extended period of time such that the normal braking operation might be in danger of a nobraking condition.
Inventors
- 👤 M Inada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:34
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/42; B60T8/4208; B60T8/4225; B60T8/88; B60T8/885
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
An anti-skid brake control system for vehicles comprising: a master cylinder generating hydraulic pressure; wheel brake cylinders; a hydraulic braking circuit connecting said master cylinder with said wheel cylinders; means for generating a skid sensing signal; a pump powered hydraulic pressure source; a reservoir hydraulically connected to said pump powered hydraulic pressure source; a cut off valve means interposed between said master cylinder and said wheel brake cylinders within said braking circuit for controlling the hydraulic communication therebetween; a hydraulic pressure reducing means interposed between said cut off valve means and wheel brake cylinders within said braking circuit, and including a housing, and a piston member slidably fitted therein and being cooperatively connected to said cut off valve means; a first electro-magnetic valve means selectively communicating said pressure reducing means with said pump powered hydraulic pressure source and said reservoir in response to said skid sensing signal; and a second electro-magnetic valve means interposed between said first electro-magnetic valve means and said reservoir and operable for interrupting the hydraulic communication therebetween after said first electro-magnetic valve means has been actuated for more than a predetermined period of time.
Claim 2
Dependent Claim
188 words
An anti-skid brake control system for vehicles comprising: a master cylinder generating hydraulic pressure; wheel brake cylinders; a hydraulic braking circuit connecting said master cylinder with said wheel cylinders; means for generating a skid sensing signal; a pump powered hydraulic pressure source; a reservoir hydraulically connected to said pump powered hydraulic pressure source; a cut off valve means interposed between said master cylinder and said wheel brake cylinders within said braking circuit for controlling the hydraulic communication therebetween; a hydraulic pressure reducing means interposed between said cut off valve means and wheel brake cylinders within said braking circuit, and including a housing, and a piston member slidably fitted therein and being cooperatively connected to said cut off valve means; a first electro-magnetic valve means selectively communicating said pressure reducing means with said pump powered hydraulic pressure source and said reservoir in response to said skid sensing signal; and a second electro-magnetic valve means interposed between said first electro-magnetic valve means and said reservoir and operable for interrupting the hydraulic communication therebetween after said first electro-magnetic valve means has been actuated for more than a predetermined period of time.
Claim 3
Dependent Claim
42 words
Anti-skid brake control system as set forth in claim 1, wherein said skid sensing signal generating means comprises a delay circuit therein to actuate said second electro-magnetic valve assembly a predetermined time after said first electro-magnetic valve assembly continues to be actuated.
Claim 4
Dependent Claim
66 words
Anti-skid brake control system as set forth in claim 2, wherein said skid sensing signal generating means further comprises an alarming circuit including an alarming lamp, and a switch assembly operatively engaged with said piston member of said hydraulic pressure reducing means thereby lighting said alarming lamp a predetermined time after said switch assembly is separated from said piston member of said hydraulic pressure reducing means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |