Air brake pilot adaptor
First Claim
1. In combination with a pneumatic control valve used in a car in tandem with the locomotive of a train to effect applying and releasing of a pneumatic brake of the car in response to variation, from the locomotive, of gas pressure in a brake pipe extending the length of the train, wherein releasing of the brake involves normally increasing pressure of a gas, previously provided to a first chamber defined on one side by a first face of a service diaphragm piston to urge the piston to a position wherein passages formed therein are aligned with other passages in the valve to permit venting of gas from a chamber in a brake cylinder;
- apparatus for positively venting of gas from the chamber in the brake cylinder to ensure release of the brake, comprising;
(a) a valving member having a passage formed therein, said passage formed in said valving member being operatively connected to the chamber in the brake cylinder so as to be in fluid communication therewith, and a port affording exhaust egress from said passage formed in said valving member;
(b) a valve element mounted in said valving member for movement between a first position occluding said port, and a second position wherein gas in said passage is exhausted through said port; and
(c) control means, segregated from gas pressure in the brake pipe, for accomplishing movement of said valve element between said first and second positions thereof.
1 Assignment
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Accused Products
Abstract
A pilot mechanism for improving operation of various functions of the pneumatic brake of a train. The mechanism includes solenoid valves, controllable by either a radio/battery mode of operation or a train wire system mode of operation. The solenoid valves can be interposed in various passages in fluid communication with passages of a conventional ABD control valve, as modified to enable operation of the invention, to permit substantially immediate venting of air in those passages to atmosphere.
22 Citations
4 Claims
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1. In combination with a pneumatic control valve used in a car in tandem with the locomotive of a train to effect applying and releasing of a pneumatic brake of the car in response to variation, from the locomotive, of gas pressure in a brake pipe extending the length of the train, wherein releasing of the brake involves normally increasing pressure of a gas, previously provided to a first chamber defined on one side by a first face of a service diaphragm piston to urge the piston to a position wherein passages formed therein are aligned with other passages in the valve to permit venting of gas from a chamber in a brake cylinder;
- apparatus for positively venting of gas from the chamber in the brake cylinder to ensure release of the brake, comprising;
(a) a valving member having a passage formed therein, said passage formed in said valving member being operatively connected to the chamber in the brake cylinder so as to be in fluid communication therewith, and a port affording exhaust egress from said passage formed in said valving member; (b) a valve element mounted in said valving member for movement between a first position occluding said port, and a second position wherein gas in said passage is exhausted through said port; and (c) control means, segregated from gas pressure in the brake pipe, for accomplishing movement of said valve element between said first and second positions thereof.
- apparatus for positively venting of gas from the chamber in the brake cylinder to ensure release of the brake, comprising;
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2. Apparatus in accordance with c1aim 1 wherein said control means includes electric actuation means.
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3. Apparatus in accordance with c1aim 2 wherein said electric actuation means comprises:
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(a) a radio transmitter in the locomotive; and (b) a radio receiver carried by the valving member.
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4. Apparatus in accordance with c1aim 2 wherein said electric actuation means comprises an electric transmission wire extending from the locomotive to the valving member.
Specification