US3712685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual circuit brake valve
Assignee: Bendix Westinghouse Automotive Air Brake Co
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Filing: 1970-09-29
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Granted: 1973-01-23
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Expires: 1990-09-29
Abstract
Abstract A dual circuit brake valve including first and second selflapping valve elements for respectively controlling primary and secondary fluid pressure braking circuits, each of the valve elements being controlled by separate relay pistons subject to fluid pressure in one of said circuits and the supply of fluid pressure to the relay pistons being manually controlled through operation of a valve which is independent of the self-lapping valve elements.
Inventors
- 👤 D Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:23
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/043; B60T15/045; B60T15/046; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
In a dual circuit brake valve having a housing including first and second sets of inlet and delivery ports, and first and second normally closed valve members for controlling the flow of fluid pressure between the respective inlet and delivery ports, the invention which comprises means for simultaneously moving said normally closed valve members to open position comprising a first fluid pressure responsive relay element in said housing for controlling the opening of the first valve member, a second fluid pressure responsive relay element in said housing for controlling the opening of the second valve member, a fixed partition in said housing provided with an opening, means including a third valve member for controlling said opening and simultaneously communicating one of said inlet ports with both of said relay elements to effect simultaneous opening of said first and second valve members, and a manually operable member for controlling the operation of said third valve member.
Claim 2
Dependent Claim
155 words
In a dual circuit brake valve having a housing including first and second sets of inlet and delivery ports, and first and second normally closed valve members for controlling the flow of fluid pressure between the respective inlet and delivery ports, the invention which comprises means for simultaneously moving said normally closed valve members to open position comprising a first fluid pressure responsive relay element in said housing for controlling the opening of the first valve member, a second fluid pressure responsive relay element in said housing for controlling the opening of the second valve member, a fixed partition in said housing provided with an opening, means including a third valve member for controlling said opening and simultaneously communicating one of said inlet ports with both of said relay elements to effect simultaneous opening of said first and second valve members, and a manually operable member for controlling the operation of said third valve member.
Claim 3
Dependent Claim
21 words
The dual circuit brake valve of claim 1 wherein the fluid pressure responsive relay elements have motive areas of equal size.
Claim 4
Dependent Claim
25 words
The dual circuit brake valve of claim 1 wherein the third valve member simultaneously communicates the first inlet port with both of said relay elements.
Claim 5
Dependent Claim
34 words
The dual circuit brake valve of claim 3 wherein said manually operable member includes a graduating piston subject to the fluid pressure at the first inlet port when the third valve member is open.
Claim 6
Dependent Claim
43 words
The dual circuit brake valve of claim 4 which includes a first delivery cavity beneath the first relay element and communicating with the first delivery port and a second delivery cavity beneath the second relay element and communicating with the second delivery port.
Claim 7
Dependent Claim
38 words
The dual circuit brake valve of claim 3 wherein said manually operable member includes means to positively move the second valve member to open position in the event of failure of fluid pressure at the first inlet port.
Claim 8
Dependent Claim
34 words
The dual circuit brake valve of claim 3 wherein the partition divides the housing into an upper chamber communicating with the first inlet port and a lower chamber communicating with the second inlet port.
Claim 9
Dependent Claim
37 words
The dual circuit brake valve of claim 7 wherein the second relay element is positioned in the lower chamber and spaced from said partition to provide a cavity communicating at all times with the first relay element.
Claim 10
Dependent Claim
30 words
The dual circuit brake valve of claim 8 wherein the third valve member normally closes the opening in the partition to interrupt communication between said cavity and the upper chamber.
Claim 11
Dependent Claim
26 words
The dual circuit brake valve of claim 9 wherein the relay elements and the first, second and third valve members are coaxially arranged in the housing.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |