US3580646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual circuit brake valve
Assignee: Bendix Westinghouse Automotive Air Brake Co
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Filing: 1969-09-17
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Granted: 1971-05-25
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Expires: 1989-09-17
Abstract
Abstract A dual circuit brake valve including first and second selflapping valve elements for respectively controlling primary and secondary fluid pressure braking circuits, the first valve element being manually controlled and the second valve element being controlled by a relay piston subject to the pressure in the primary circuit wherein the relay piston is subjected to the action of a pair of springs acting in opposite directions so that during operation of the first valve element the crack pressure required to open the second valve element is reduced to a minimum and the application of fluid pressure to the primary and secondary circuits is substantially simultaneous.
Inventors
- 👤 George E Ternent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:19
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/043; B60T15/045; B60T15/046; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
268 words
In a dual circuit brake valve having a housing including first and second sets of inlet and delivery ports, first and second normally closed valve members for controlling communication between the respective inlet and delivery ports, manual valve actuating means for moving the first valve member to open position, second valve actuating means for moving said second valve member to open position, a fluid responsive relay member connected to said second valve actuating means and movable therewith, and fluid passage means communicating said first delivery port with said fluid responsive relay member, the invention which comprises a first spring acting on said relay member and constantly tending to move the latter and the second valve actuating means in a direction to open said second valve member, and a second spring arranged between said manual valve actuating means and said second valve actuating means and acting in opposition to said first spring to apply a preloading force on the second valve actuating means to maintain the latter spaced from said second valve member, said second spring constructed and arranged such that the manual and second valve actuating means move in unison until the second valve actuating means engages the second valve member, additional movement of said manual valve actuating means effecting the opening of said first valve member and the removal of said preload force from said second valve actuating means so that the second valve member is opened by movement of the relay member and second valve actuating member in response to the action of said first spring and the fluid pressure supplied through said fluid passage means.
Claim 2
Dependent Claim
268 words
In a dual circuit brake valve having a housing including first and second sets of inlet and delivery ports, first and second normally closed valve members for controlling communication between the respective inlet and delivery ports, manual valve actuating means for moving the first valve member to open position, second valve actuating means for moving said second valve member to open position, a fluid responsive relay member connected to said second valve actuating means and movable therewith, and fluid passage means communicating said first delivery port with said fluid responsive relay member, the invention which comprises a first spring acting on said relay member and constantly tending to move the latter and the second valve actuating means in a direction to open said second valve member, and a second spring arranged between said manual valve actuating means and said second valve actuating means and acting in opposition to said first spring to apply a preloading force on the second valve actuating means to maintain the latter spaced from said second valve member, said second spring constructed and arranged such that the manual and second valve actuating means move in unison until the second valve actuating means engages the second valve member, additional movement of said manual valve actuating means effecting the opening of said first valve member and the removal of said preload force from said second valve actuating means so that the second valve member is opened by movement of the relay member and second valve actuating member in response to the action of said first spring and the fluid pressure supplied through said fluid passage means.
Claim 3
Dependent Claim
20 words
The dual brake valve construction of claim 1 wherein the second spring exerts a greater force than said first spring.
Claim 4
Dependent Claim
64 words
The dual brake valve construction of claim 2 wherein the second valve actuating means is of tubular construction and provided with a head at its upper end, and a rod fixed to said manual valve actuating means and having a part extending downwardly into the second valve actuating member, said second spring being confined between the lower end of said part and said head.
Claim 5
Dependent Claim
27 words
The dual brake valve construction of claim 3 wherein said head is received within a recess provided in the lower portion of said manual valve actuating member.
Claim 6
Dependent Claim
27 words
The dual brake valve construction of claim 4 wherein said rod is provided with an enlarged collar positioned in said recess and said head surrounds said collar.
Claim 7
Dependent Claim
32 words
The dual brake valve construction of claim 5 wherein said second spring is confined between the lower end of said part at one end and the head and collar at the other.
Claim 8
Dependent Claim
39 words
The dual brake valve construction of claim 6 wherein the upper surface of said head is normally spaced from the upper end of said recess to afford a lost motion between the manual valve actuating means and said head.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |