Patent US3866982A successfully refreshed from Google Patents.
US3866982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Failsafe antiskid control for fluid pressure brake system
Assignee: WABCO WESTINGHOUSE GmbH
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Filing: 1974-03-27
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Granted: 1975-02-18
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Expires: 1994-03-27
Abstract
Abstract A means for operating an inlet modulator valve in an antiskid brake control system via either its normal energizing circuit or via a diode in a parallel circuit that is energized when an outlet modulator valve is operated during a cycle of wheel skid control. This assures operation of the inlet modulator any time the outlet modulator is operated so that inadvertent supply of brake pressure via the inlet modulator is prevented when a malfunction renders the inlet modulator inoperative via its normal energizing circuit at the time the outlet modulator is venting brake pressure, thus safeguarding the system against depletion of supply pressure and consequent loss of braking ability following completion of the wheel skid control cycle.
Inventors
- 👤 Georg Geier
- 👤 Alfred Klatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:56
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3605
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A vehicle antiskid brake control system of the type having wheel monitoring means for producing output signals according to the dynamic behavior of the wheel, a first one of said output signals being connectable with an inlet modulator valve and a second one of said output signals being conectable with an outlet modulator valve to control operation thereof for effecting adjustment of the wheel brake pressure during a cycle of wheel skid control, wherein the improvement comprises means for connecting said second output signal to said inlet valve in parallel with said first output signal to effect operation of said inlet valve when said outlet valve is operated in the absence of said first output signal.
Claim 2
Dependent Claim
116 words
A vehicle antiskid brake control system of the type having wheel monitoring means for producing output signals according to the dynamic behavior of the wheel, a first one of said output signals being connectable with an inlet modulator valve and a second one of said output signals being conectable with an outlet modulator valve to control operation thereof for effecting adjustment of the wheel brake pressure during a cycle of wheel skid control, wherein the improvement comprises means for connecting said second output signal to said inlet valve in parallel with said first output signal to effect operation of said inlet valve when said outlet valve is operated in the absence of said first output signal.
Claim 3
Dependent Claim
40 words
The system as recited in claim 1, further characterized in that said first and second output signals have an electrical characteristic and said inlet and outlet valves are electrically controlled in accordance with said first and second output signals, respectively.
Claim 4
Dependent Claim
39 words
The system as recited in claim 2, further characterized in that said means for connecting said second output signal to said inlet valve includes a diode to prevent said first output signal from being connected to said outlet valve.
Claim 5
Dependent Claim
129 words
The system as recited in claim 2, further comprising: a. a source of fluid pressure; b. a fluid pressure operated brake cylinder device; c. valve means for controlling the supply of fluid pressure from said source to said brake cylinder device to provide said wheel brake pressure; and d. said inlet valve being normally open to admit fluid brake pressure provided by said valve means to said brake cylinder device and said outlet valve being normally closed to interrupt atmospheric communication with said brake cylinder device, said inlet valve interrupting admission of fluid brake pressure from said valve means and said outlet valve establishing said atmospheric communication to vent said wheel brake pressure when each of said inlet and outlet valves is operated responsive to said second output signal.
Claim 6
Dependent Claim
39 words
The system as recited in claim 4, further characterized in that said inlet and outlet valves are switched from a deenergized condition to an energized condition responsive to said second output signal being provided to effect said operation thereof.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |