US3747992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay valve for electro-pneumatic control system
Assignee: Bendix Corp
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Filing: 1971-04-16
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Granted: 1973-07-24
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Expires: 1991-04-16
Abstract
Abstract A relay valve is disclosed for use in an electro-pneumatic braking system for air-braked vehicles. The relay valve includes a conventional housing defining a chamber therewithin in which a control piston reciprocates. The piston divides the chamber into a primary section and a delivery section. Movement of the piston closes a valve which exhausts the delivery section and opens a valve which communicates air from a pressurized supply to the delivery section, and ultimately to the brake actuators. The piston is moved in the usual manner by admitting service air from the brake control valve of the system. However, in order to reduce the response time of the system, a first solenoid valve communicates supply air to the primary section when the brake valve is applied and a second solenoid valve exhausts the primary section to atmosphere when the brake control valve is released. Appropriate control circuitry is disclosed to operate the solenoid valves.
Inventors
- 👤 D Schnipke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/58; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
309 words
In a relay valve for use in a braking system having a pressure source, a plurality of brake actuators, and a brake control valve for controlling said brake actuators: a housing defining a chamber therewithin; a piston slidably mounted in said chamber dividing the latter into first and second sections; said first section being communicated with said brake actuators; valve means operated by sliding of the piston for controlling communication between said first section and said pressure source and between said first section and the atmosphere; said piston being slidable from a first position venting said first section to atmosphere and a second position closing communication between the first section and the atmosphere and initiating communication between the first section and said pressure source; resilient means yieldably urging said piston toward said first position; and electrically operated valve means for communicating fluid pressure from the pressure sourCe to the second section when a brake application is effected to slide said piston toward the second position and venting said second section to the atmosphere when the brake application is terminated; said housing having a supply port communicating said second section with said pressure source, a service port communicated with said brake valve, and an exhaust port communicating said second section with the atmosphere; said electrically operated valve means normally preventing communication between said supply and exhaust ports and said second section and permitting fluid communication between said service port and said second section; said electrically operated valve means terminating fluid communication between the service port and the second section and initiating fluid communication between said supply port and said second section when a brake application is effected, said electrically operated valve means terminating fluid communication between the supply port and the second section and initiating communication between the exhaust port and the second section when a brake application is terminated.
Claim 2
Dependent Claim
309 words
In a relay valve for use in a braking system having a pressure source, a plurality of brake actuators, and a brake control valve for controlling said brake actuators: a housing defining a chamber therewithin; a piston slidably mounted in said chamber dividing the latter into first and second sections; said first section being communicated with said brake actuators; valve means operated by sliding of the piston for controlling communication between said first section and said pressure source and between said first section and the atmosphere; said piston being slidable from a first position venting said first section to atmosphere and a second position closing communication between the first section and the atmosphere and initiating communication between the first section and said pressure source; resilient means yieldably urging said piston toward said first position; and electrically operated valve means for communicating fluid pressure from the pressure sourCe to the second section when a brake application is effected to slide said piston toward the second position and venting said second section to the atmosphere when the brake application is terminated; said housing having a supply port communicating said second section with said pressure source, a service port communicated with said brake valve, and an exhaust port communicating said second section with the atmosphere; said electrically operated valve means normally preventing communication between said supply and exhaust ports and said second section and permitting fluid communication between said service port and said second section; said electrically operated valve means terminating fluid communication between the service port and the second section and initiating fluid communication between said supply port and said second section when a brake application is effected, said electrically operated valve means terminating fluid communication between the supply port and the second section and initiating communication between the exhaust port and the second section when a brake application is terminated.
Claim 3
Dependent Claim
36 words
The invention of claim 1: said electrically operated valve means including a double acting solenoid valve operable to both terminate fluid communication between the supply port and the second section when a brake application is effected.
Claim 4
Dependent Claim
120 words
The invention of claim 2: said double acting solenoid valve including a bore defined within said housing, valve seats at opposite ends of said bore dividing the latter into a central compartment and a pair of end compartments, one of said end compartments being communicated to said supply port, the other of said end compartments being communicated to said service port, said central compartment being communicated to said second section, a valve member within said central compartment, resilient means yieldably urging said valve member into engagement with the valve seat between the central compartment and the one end compartment, and a valve operating member extending through one of said valve seats for engagement with the armature of the solenoid valve.
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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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |