Hand brake release apparatus

Details Hand brake release apparatus Hand brake release apparatus

1981-05-07

1983-01-18

Reger, Duane A.

Fluid-pressure and analogous brake systems

Exterior control

303 2, 303 71, B60T 1536

Patent

active

043689272

ABSTRACT:
Apparatus (1) for automatically releasing a railroad car hand brake (HB) normally maintained in its applied position. An air pressure activated cylinder (9) acts on a hand brake release (5) to release the hand brake. An air line (13) directs pressurized air from a pressurized air source to the air cylinder. A valve (27) connected in the air line is responsive to the source air pressure. The valve is normally closed but opens when source air pressure reaches a level sufficient to release the air brakes on the car. A draft load sensor (29) is positioned in the air line between the valve and air cylinder. The sensor normally blocks the air line, but unblocks it when a sufficiently great draft load is sensed. The hand brake is released only if source air pressure is sufficiently high and the draft load on the railroad car is sufficiently great.

REFERENCES:
patent: 3891277 (1975-06-01), Cope
patent: 3974899 (1976-08-01), Mita et al.
patent: 3982794 (1976-09-01), Colovas et al.
patent: 4033629 (1977-07-01), Spalding
patent: 4166513 (1979-09-01), Johnson

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