Patent US3706480A successfully refreshed from Google Patents.
US3706480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control valve apparatus
Assignee: Westcode Inc
•
Filing: 1971-02-16
•
Granted: 1972-12-19
•
Expires: 1991-02-16
Abstract
Abstract An improved form of triple valve for control of fluid braking has a charged accelerated release reservoir which is connectable to the brake pipe the pressure in which is controlling the triple valve on release of the brakes to assist such release and the propagation of the release along a train having a succession of such triple valves on the same brake pipe. The accelerated release is piloted by brake cylinder exhaust pressure transients being used to control a pressure responsive device to briefly operate an accelerated release valve which connects the accelerated releaser reservoir to the brake pipe.
Inventors
- 👤 Jack Washbourn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:25
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/36; B60T15/52; B60T15/18; B60T15/24; B60T15/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
Fluid operable brake control valve apparatus comprising brake cylinder valve means for controlling the supply of fluid pressure into and out of a brake cylinder, a main pressure responsive member movable in response to changes of pressure when applied to a brake pipe for operating said valve means, and an accelerated release valve operable in response to release of fluid pressure from the brake cylinder to connect a charged reservoir to the brake pipe to assist a change of pressure in the brake pipe causing such release.
Claim 2
Dependent Claim
87 words
Fluid operable brake control valve apparatus comprising brake cylinder valve means for controlling the supply of fluid pressure into and out of a brake cylinder, a main pressure responsive member movable in response to changes of pressure when applied to a brake pipe for operating said valve means, and an accelerated release valve operable in response to release of fluid pressure from the brake cylinder to connect a charged reservoir to the brake pipe to assist a change of pressure in the brake pipe causing such release.
Claim 3
Dependent Claim
75 words
Fluid operable brake control valve apparatus as claimed in claim 1 comprising a further pressure responsive member for operating said accelerated release valve, one side of which further pressure responsive member is subject to pressure in a brake cylinder exhaust passage and the other side of which communicates with the one side through a choke, and means normally biassing the further pressure responsive member towards a position in which the accelerated release valve is closed.
Claim 4
Dependent Claim
38 words
Fluid operable brake control valve apparatus as claimed in claim 2, including valve means for charging the accelerated release reservoir from an auxiliary reservoir for the valve apparatus in the release position of the main pressure responsive member.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |