Automatic handbrake release system for a railroad car

Details Automatic handbrake release system for a railroad car Automatic handbrake release system for a railroad car

1994-02-07

1995-11-28

Graham, Matthew C.

Brakes

Operators

Multiple

188 47, F16D 6514

Patent

active

054699410

ABSTRACT:
A system is presented for automatically releasing all handbrakes of a railroad freight car or passenger car system. Working from the main air brake pressure lines, a pressure switch is provided which trips once the air pressure for the separate air brake system of a freight train or passenger train is reached. This pressure switch in turn energizes another mechanism, either a piston or other internal types of mechanical connection, which then pushes up the brake lever release releasing the handbrake. Since each handbrake on each end of each car is connected to the main air brake system through pressure sensitive valves, all manual handbrakes are released on all cars once the air pressure of the train is brought up to a certain level.

REFERENCES:
patent: Re34040 (1992-08-01), Rains
patent: 1368795 (1921-02-01), Haas
patent: 1879971 (1932-01-01), Burnett
patent: 1991330 (1935-02-01), Mitchell
patent: 2183303 (1939-12-01), Campbell
patent: 4049088 (1977-09-01), Stjarne et al.
patent: 4746171 (1988-05-01), Engle
patent: 4805743 (1989-02-01), Rains
patent: 4978178 (1990-12-01), Engle
patent: 5201890 (1993-04-01), Sauer et al.

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