US3773365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-lock brake system
Assignee: Berg Manufacturing Co
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Filing: 1972-05-08
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Granted: 1973-11-20
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Expires: 1992-05-08
Abstract
Abstract A brake system in which a valve is responsive to excess torque sensed in an anti-lock device to deliver fluid pressure to the emergency brake actuators to reduce the braking pressure thereof and thus to prevent wheel lock-up.
Inventors
- 👤 C Horowitz
- 👤 S Campanini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:02
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
An anti-lock vehicle brake system including spring appliedfluid pressure released emergency brake actuators, a source of fluid pressure, an anti-lock mechanism generating electrical signals in response to excess torque sensed therein, an electrically operated valve controlling communication between said source and said actuators and a conductor connected to said mechanism and valve and effective to transmit said signals to said valve to direct fluid pressure from said source to said actuators, a relay valve controlling direct communication between said source and actuators, a control element in said relay valve, said electrically operated valve being communicable with atmosphere to exhaust said control element and close said relay valve against communication of said source with said actuators, a two-way check valve between said electrically operated and relay valves, said electrically operated valve communicating with one inlet of said check valve, said control element of said relay valve communicating with the outlet of said check valve, a second source of fluid pressure and control valve means controlling communication of said second source with the opposite inlet of said check valve.
Claim 2
Dependent Claim
177 words
An anti-lock vehicle brake system including spring appliedfluid pressure released emergency brake actuators, a source of fluid pressure, an anti-lock mechanism generating electrical signals in response to excess torque sensed therein, an electrically operated valve controlling communication between said source and said actuators and a conductor connected to said mechanism and valve and effective to transmit said signals to said valve to direct fluid pressure from said source to said actuators, a relay valve controlling direct communication between said source and actuators, a control element in said relay valve, said electrically operated valve being communicable with atmosphere to exhaust said control element and close said relay valve against communication of said source with said actuators, a two-way check valve between said electrically operated and relay valves, said electrically operated valve communicating with one inlet of said check valve, said control element of said relay valve communicating with the outlet of said check valve, a second source of fluid pressure and control valve means controlling communication of said second source with the opposite inlet of said check valve.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |