Patent US2427235A successfully refreshed from Google Patents.
US3729233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle antiskid braking system
Assignee: DBA SA
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Filing: 1971-03-10
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Granted: 1973-04-24
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Expires: 1991-03-10
Abstract
Abstract This invention relates to an antiskid braking system for automotive vehicles, wherein the fluid supply connection provided between a variable fluid braking pressure control source and a set of fluid pressure actuated brake motors is controlled by fluid pressure modulating valve means actuated by output control signals generated by an antiskid unit in response to a skidding condition of the brake vehicle. The fluid supply connection is provided with a restricted area fluid passage disposed between said fluid source and said modulating valve means so as to substantially limit the fluid flow rate to said brake motors upon opening of said fluid supply connection, and thereby to dampen the build-up in pressure to the brake motors.
Inventors
- 👤 J Mangold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5018; B60T8/5025; B60T8/343; B60T8/344; B60T8/347
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
In a vehicle antiskid braking system: operator-operated fluid pressure generating means for generating braking pressure in said system; brake actuating means responsive to the fluid pressure generated by said fluid pressure generating means for effecting a brake actuation; means communicating the fluid pressure generating means with said brake actuating means; and means responsive to an incipient skidding condition of a vehicle wheel and generating an output signal in response thereto; said communicating means including modulating means responsive to said output signal for controlling fluid communication between said pressure generating means and said brake actuating means; said communicating means including a restricted area passage to limit the fluid flow rate to said actuating means, bypass passage means in parallel fluid flow relationship with said restricted area passage, and normally open valve means in said bypass passage means normally permitting uninhibited fluid communication therethrough, said valve means being responsive to the fluid pressure differential across said modulating means to close said valve means when said pressure differential attains a predetermined level.
Claim 2
Dependent Claim
169 words
In a vehicle antiskid braking system: operator-operated fluid pressure generating means for generating braking pressure in said system; brake actuating means responsive to the fluid pressure generated by said fluid pressure generating means for effecting a brake actuation; means communicating the fluid pressure generating means with said brake actuating means; and means responsive to an incipient skidding condition of a vehicle wheel and generating an output signal in response thereto; said communicating means including modulating means responsive to said output signal for controlling fluid communication between said pressure generating means and said brake actuating means; said communicating means including a restricted area passage to limit the fluid flow rate to said actuating means, bypass passage means in parallel fluid flow relationship with said restricted area passage, and normally open valve means in said bypass passage means normally permitting uninhibited fluid communication therethrough, said valve means being responsive to the fluid pressure differential across said modulating means to close said valve means when said pressure differential attains a predetermined level.
Claim 3
Dependent Claim
85 words
The invention of claim 1: said normally open valve means including a pressure differential responsive piston for operating said normally open valve means, and resilient means yieldably urging said piston toward a position maintaining said normally open valve means open, said piston having a pair of opposed faces, one of said faces being communicated to the fluid pressure on one side of said modulating means, the other face of said piston being communicated to the fluid pressure on the other side of said modulating means.
Claim 4
Dependent Claim
89 words
The invention of claim 1: there being a pair of said brake actuating means, each of said brake actuating means actuating a corresponding brake; there being a pair of said modulating means, one for each of said brake actuating means; said normally open valve means including a valve operating piston having a pair of opposed faces, said piston being controlled by the differential fluid pressures across both of the modulating means to close said bypass passage means whenever one of said differential fluid pressures is above said predetermined level.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |