US4319787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail vehicle braking apparatus
Assignee: Siemens Mobility Ltd
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Filing: 1980-02-08
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Granted: 1982-03-16
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Expires: 2000-02-08
Abstract
Abstract A rail vehicle braking apparatus which operates with brake control valves on successive vehicles of a train controlled by pressure in a brake pipe extending along the train has warning means responsive to rising brake pipe fluid flow to warn of possible non-released brakes in the train and the warning means being inhibited by a rising fluid pressure-sensing means to prevent an undesired warning due to brake pipe fluid flow during release of the brakes.
Inventors
- 👤 David J. Wickham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:33
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/228
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A rail vehicle braking apparatus with a brake pipe extending along a train from one vehicle to another vehicle, successive such vehicles having brake control valves for controlling the brakes in response to pressure changes in the brake pipe, brake pipe flow warning means on one vehicle including an increasing fluid flow sensor, and means responsive to sensed increasing fluid flow in the brake pipe for operating a warning device to give a warning of an occurrence of abnormal fluid flow, a pressure-responsive means, operable independently of said fluid flow sensor, which is responsive to changing brake pipe pressure occurring during release of the brakes and inhibiting means operable by the pressure-responsive means to inhibit the warning means for prevention of a warning during such release of the brakes.
Claim 2
Dependent Claim
129 words
A rail vehicle braking apparatus with a brake pipe extending along a train from one vehicle to another vehicle, successive such vehicles having brake control valves for controlling the brakes in response to pressure changes in the brake pipe, brake pipe flow warning means on one vehicle including an increasing fluid flow sensor, and means responsive to sensed increasing fluid flow in the brake pipe for operating a warning device to give a warning of an occurrence of abnormal fluid flow, a pressure-responsive means, operable independently of said fluid flow sensor, which is responsive to changing brake pipe pressure occurring during release of the brakes and inhibiting means operable by the pressure-responsive means to inhibit the warning means for prevention of a warning during such release of the brakes.
Claim 3
Dependent Claim
54 words
Apparatus as claimed in claim 1, wherein the increasing fluid flow sensor is included in a fluid pressure line which carries a supply input to a brake valve which is operable to control the pressure in the brake pipe whereas the pressure-responsive means is connected to the brake pipe downstream of the brake valve.
Claim 4
Dependent Claim
52 words
Apparatus as claimed in claim 1 or 2, wherein the vehicle's brakes are such as to be applied by the respective control valves upon reduction of brake pipe pressure from a charged value of pressure and the pressure-responsive means being responsive to rising brake pipe pressure corresponding to release of the brakes.
Claim 5
Dependent Claim
85 words
Apparatus as claimed in claim 1 or 2, the increasing fluid flow sensor including a first restriction, a diaphragm valve, one input to which is connected via a second restriction to a point upstream of the first restriction and a second input to which is connected to a point downstream of the first restriction, the output of the diaphragm valve resulting from flow via the second restriction, via a third restriction and a point upstream of third restriction, being connected to a pressure change sensor.
Claim 6
Dependent Claim
68 words
Apparatus as claimed in claim 4, wherein the pressure change sensor comprises a further diaphragm valve having a first input connected to said point upstream of the third restriction via a fourth restriction, and a second input connected to said point upstream of the third restriction such that the pressure change sensor produces an output pressure signal in the event of rising pressure upstream of the third restriction.
References Cited (Backward Citations)
US2042094A
Cited
US3966272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |