US3731982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure operable brake control valves
Assignee: Westcode Inc
•
Filing: 1971-05-28
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Granted: 1973-05-08
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Expires: 1991-05-28
Abstract
Abstract A triple valve for fluid operable braking is provided with an additional emergency braking valve portion which has its own pressure responsive member which is responsive to at least a predetermined reduction of brake pipe pressure relative to quick action chamber pressure in a given period of time to open a brake cylinder valve to apply pressure to the brake cylinder from a reservoir and open a vent valve to vent the brake pipe, the vent valve and the brake cylinder valve being arranged in line and having between them an accelerated release valve which on return movement of the pressure responsive member past its initial position, is allowed to open to connect brake cylinder to brake pipe until the latter are within a predetermined pressure of each other.
Inventors
- 👤 P Paginton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:46
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/18; B60T15/24; B60T15/30; B60T15/302; B60T15/20; B60T15/22; B60T17/00; B60T17/18; B60T17/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
Fluid operable brake control apparatus for controlling, in response to brake pipe pressure, the supply of fluid under pressure into and out of a brake cylinder, the apparatus including a first chamber at brake pipe pressure and a second chambEr at reference pressure, a fluid pressure responsive member separating the first and second chambers, choke means between said chambers, a brake cylinder valve and a vent valve, the brake cylinder valve being connected between a fluid pressure reservoir and a brake cylinder port, the vent valve being connected between a brake pipe port and an exhaust port, means linking both said valves to the pressure responsive member so as to be opened by movement of the pressure responsive member when a fall of brake pipe pressure in relation to the reference pressure is sufficiently rapid as to not be compensated for by fluid flow in the choke means, and an accelerated release valve connected between the brake cylinder port and the brake pipe and so mechanically coupled to the pressure responsive member as to be opened when a recovery of brake pipe pressure in the first chamber beyond a reduced reference pressure in the second chamber takes place after reclosure of the brake cylinder valve and the vent valve.
Claim 2
Dependent Claim
209 words
Fluid operable brake control apparatus for controlling, in response to brake pipe pressure, the supply of fluid under pressure into and out of a brake cylinder, the apparatus including a first chamber at brake pipe pressure and a second chambEr at reference pressure, a fluid pressure responsive member separating the first and second chambers, choke means between said chambers, a brake cylinder valve and a vent valve, the brake cylinder valve being connected between a fluid pressure reservoir and a brake cylinder port, the vent valve being connected between a brake pipe port and an exhaust port, means linking both said valves to the pressure responsive member so as to be opened by movement of the pressure responsive member when a fall of brake pipe pressure in relation to the reference pressure is sufficiently rapid as to not be compensated for by fluid flow in the choke means, and an accelerated release valve connected between the brake cylinder port and the brake pipe and so mechanically coupled to the pressure responsive member as to be opened when a recovery of brake pipe pressure in the first chamber beyond a reduced reference pressure in the second chamber takes place after reclosure of the brake cylinder valve and the vent valve.
Claim 3
Dependent Claim
30 words
Fluid operable brake control valve apparatus as claimed in claim 1, the vent valve, the brake cylinder valve and the accelerated release valve all being disposed in an in-line arrangement.
Claim 4
Dependent Claim
55 words
Fluid operable brake control valve apparatus as claimed in claim 2 wherein the accelerated release valve comprises a closure member and a seat which are movable as one in the closed position thereof, and the brake cylinder valve being operable by the pressure responsive member via an actuating rod and the movable accelerated release valve.
Claim 5
Dependent Claim
63 words
Fluid operable brake control valve apparatus as claimed in claim 3, further comprising resilient means for resiliently urging the accelerated release valve towards the closed position in the release position of the apparatus in order that it operates as a check valve during brake release operation and closes at a predetermined value of pressure difference between the brake pipe and the brake cylinder
Claim 6
Dependent Claim
42 words
Fluid operable brake control valve apparatus as claimed in claim 1 arranged and connected to operate as an emergency valve in combination with a service application controlling triple valve which is responsive to less than said predetermined change of brake pipe pressure.
References Cited (Backward Citations)
US1895464A
Cited
US3472562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |