US3869177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic anti-skid control brake system with an emergency brake control valve
Assignee: Eaton Corp
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Filing: 1973-02-12
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Granted: 1975-03-04
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Expires: 1993-02-12
Abstract
Abstract A brake control system for a towed vehicle which includes an emergency control valve operative in combination with an antiskid system to provide emergency brake control in the event service pressure is lost. The emergency control valve senses a pressure level in the emergency line and supplies brake apply pressure from a reservoir on the towed vehicle when the emergency line pressure falls below a predetermined level. The valve is also usable with spring brakes such that the spring brakes provide a back-up parking brake without overriding the anti-skid control during emergency operation.
Inventors
- 👤 John A Urban
- 👤 Gary L Hopkins
- 👤 John Keith Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:51
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/323; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/261; B60T13/263; B60T13/36; B60T8/88; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
320 words
A brake control system for controlling the application of fluid operated brakes of a wheeled vehicle, said system comprising: A. a fluid operated brake actuator for applying the brakes of a wheel; B. a relay valve for controlling the application of fluid pressure to said brake actuator, said relay valve including 1. a service port in communication with said brake actuator, 2. a supply port, 3. a pilot portion for communicating said supply port with said service port in response to a fluid pressure, and 4. operator means for venting said pilot portion; C. a first source of fluid pressure; D. a second operator controlled source of fluid pressure; E. reservoir means connected with said first source and said supply port; F. control valve means connected to said reservoir means, said first source, said operator controlled source, and said pilot portion, said control valve means including 1. means for selectively communicating said pilot portion with said operator controlled source of fluid pressure when the pressure from said first source is above a predetermined level, whereby normal braking of said wheel is provided by communicating said supply port with said service port in response to a fluid pressure from said operator controlled source of fluid pressure, and 2. means for selectively communicating said pilot portion with said reservoir means when the pressure from said first source is below a predetermined level, whereby said emergency braking of said wheel is provided by communicating said supply port with said service port in response to the fluid pressure from said first source falling below said predetermined level; G. skid control means for detecting a skid at the braked wheel and generating a skid signal; and H. circuit means connecting said operator meand and skid means for actuating said operator means to vent said pilot portion when a skid signal is generated, thereby providing skid control of said braked wheel during normal and emergency braking.
Claim 2
Dependent Claim
320 words
A brake control system for controlling the application of fluid operated brakes of a wheeled vehicle, said system comprising: A. a fluid operated brake actuator for applying the brakes of a wheel; B. a relay valve for controlling the application of fluid pressure to said brake actuator, said relay valve including 1. a service port in communication with said brake actuator, 2. a supply port, 3. a pilot portion for communicating said supply port with said service port in response to a fluid pressure, and 4. operator means for venting said pilot portion; C. a first source of fluid pressure; D. a second operator controlled source of fluid pressure; E. reservoir means connected with said first source and said supply port; F. control valve means connected to said reservoir means, said first source, said operator controlled source, and said pilot portion, said control valve means including 1. means for selectively communicating said pilot portion with said operator controlled source of fluid pressure when the pressure from said first source is above a predetermined level, whereby normal braking of said wheel is provided by communicating said supply port with said service port in response to a fluid pressure from said operator controlled source of fluid pressure, and 2. means for selectively communicating said pilot portion with said reservoir means when the pressure from said first source is below a predetermined level, whereby said emergency braking of said wheel is provided by communicating said supply port with said service port in response to the fluid pressure from said first source falling below said predetermined level; G. skid control means for detecting a skid at the braked wheel and generating a skid signal; and H. circuit means connecting said operator meand and skid means for actuating said operator means to vent said pilot portion when a skid signal is generated, thereby providing skid control of said braked wheel during normal and emergency braking.
Claim 3
Dependent Claim
3 words
a supply port,
Claim 4
Dependent Claim
3 words
a supply port,
Claim 5
Dependent Claim
44 words
The system of claim 1 wherein said brake actuator includes means normally operative to apply the brakes, said control valve means further including hold-off means for communicating fluid pressure to said brake actuator to render said normally operative means ineffective to apply the brakes.
Claim 6
Dependent Claim
113 words
means for selectively communicating said pilot portion with said reservoir means when the pressure from said first source is below a predetermined level, whereby said emergency braking of said wheel is provided by communicating said supply port with said service port in response to the fluid pressure from said first source falling below said predetermined level; G. skid control means for detecting a skid at the braked wheel and generating a skid signal; and H. circuit means connecting said operator meand and skid means for actuating said operator means to vent said pilot portion when a skid signal is generated, thereby providing skid control of said braked wheel during normal and emergency braking.
Claim 7
Dependent Claim
113 words
means for selectively communicating said pilot portion with said reservoir means when the pressure from said first source is below a predetermined level, whereby said emergency braking of said wheel is provided by communicating said supply port with said service port in response to the fluid pressure from said first source falling below said predetermined level; G. skid control means for detecting a skid at the braked wheel and generating a skid signal; and H. circuit means connecting said operator meand and skid means for actuating said operator means to vent said pilot portion when a skid signal is generated, thereby providing skid control of said braked wheel during normal and emergency braking.
Claim 8
Dependent Claim
34 words
The system of claim 2 wherein said hold-off means includes pressure responsive means operative to maintain said normally operative means ineffective only when the pressure in said reservoir means is above a predetermined level.
Claim 9
Dependent Claim
19 words
a pilot portion for communicating said supply port with said service port in response to a fluid pressure, and
Claim 10
Dependent Claim
19 words
a pilot portion for communicating said supply port with said service port in response to a fluid pressure, and
Claim 11
Dependent Claim
60 words
operator means for venting said pilot portion; C. a first source of fluid pressure; D. a second operator controlled source of fluid pressure; E. reservoir means connected with said first source and said supply port; F. control valve means connected to said reservoir means, said first source, said operator controlled source, and said pilot portion, said control valve means including
Claim 12
Dependent Claim
60 words
operator means for venting said pilot portion; C. a first source of fluid pressure; D. a second operator controlled source of fluid pressure; E. reservoir means connected with said first source and said supply port; F. control valve means connected to said reservoir means, said first source, said operator controlled source, and said pilot portion, said control valve means including
Claim 13
Dependent Claim
30 words
The system of claim 2 wherein Said normally operative means becomes increasingly effective to apply the brakes as the pressure in said reservoir means progressively decreases below said predetermined level.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |