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Electro-pneumatic brake apparatus for railway vehicles

  • US 3,944,287 A
  • Filed: 04/07/1975
  • Issued: 03/16/1976
  • Est. Priority Date: 04/18/1974
  • Status: Expired due to Term
First Claim
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1. Electro-pneumatic brake apparatus for railway vehicles comprising:

  • a. a source of pneumatic pressure;

    b. pneumatic brake means responsive to pneumatic pressure for providing a pneumatic brake force;

    c. dynamic brake means responsive to an electrical impulse for providing a magnetic brake torque;

    d. operator actuated means providing a brake-initiating signal of preselected magnitude;

    e. primary relay valve device connected to said source of pneumatic pressure and to said operator actuated means and operable responsively to said brake-initiating signal to produce a first control pressure;

    f. a pneumatic-electro converter device connected to said primary relay valve device and to said dynamic brake means for converting said first control pressure to an electrical impulse transmitted to said dynamic portion for producing said magnetic brake torque;

    g. electro-pneumatic converter means connected to said dynamic brake means for receiving and converting said magnetic brake torque to a second control pressure; and

    h. a secondary relay valve device connected to said source of pneumatic pressure, to said primary relay valve device, and to said electro-pneumatic converter means, and operable responsively to said first and second control pressures for effecting supply of operating pneumatic pressure from said source to said pneumatic brake means at a degree according the differential between said first and second control pressures for producing a corresponding brake force.

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