Westinghouse Air Brake Company

Wabco Gmbh

Albert A. Mckay

Ulf Stahmer

Eric G. Smith

David A. Porteous

Stanley John Pasek

Jeffrey D. Reid

Trevor A. Scott

W. Thomas Digweed

David A Porteous

Eric G Smith

Albert A McKay

Jeffrey D Reid

Trevor A Scott

W Thomas Digweed

Stanley J Pasek

Albert A Mckay

A test connector for connecting an air brake test device to access ports of an air brake control valve device where such access ports are normally closed by check valves. A plurality of actuator devices corresponding in number to the access ports are provided in the test connector to unseat the check valves and conduct test air to the test device via central passages in the actuators. The actuators are piston operated in response to a pilot pressure received from a source of compressed air remote from the connector.

Test connector for accessing compressed air at test ports of a railroad

A hydro-pneumatic brake actuator arranged with a slack adjuster piston and one-way check valve device in the hydraulic path between a hydro-pneumatic actuator and a power piston, to which a friction brake element is connected for engagement with a vehicle wheel tread or brake disc during a brake application. During a brake release, the one-way check valve closes a passage through the slack adjuster piston to cause the piston to shift from its one extreme position to the other extreme position with the fluid flow, as the hydro-pneumatic actuator is moved from its application position to its release position. This in turn draws hydraulic fluid from the power piston chamber into a clearance volume created by shifting of the slack adjuster piston, and accordingly forces the power piston to retract a predetermined distance corresponding to the capacity of the clearance volume and the effective area of the power piston, thereby maintaining a constant brake shoe clearance during brake release.

Hydro-pneumatic brake actuator arranged to maintain a constant brake

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Burlington, Canada

David A Porteous