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Air brake safety mechanism

  • US 4,273,388 A
  • Filed: 07/13/1979
  • Issued: 06/16/1981
  • Est. Priority Date: 07/13/1979
  • Status: Expired due to Term
First Claim
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1. A fluid operated braking mechanism for a vehicle, comprising:

  • a brake chamber;

    a movable member mounted in said brake chamber and responsive to fluid pressure introduced into said chamber for operating the brakes of the vehicle;

    a housing mounted adjacent to said brake chamber; and

    elongated screw affixed to said movable member in said brake chamber and extending into said housing for linear movement in both directions along a particular axis, said movable member holding said elongated screw against rotation;

    a nut positioned in coaxial relationship with said screw and in threaded relationship with said screw to permit such linear movement of said screw along said axis so long as said nut is freely rotatable;

    bearing means mounting said nut in said housing to cause said nut to be freely rotatable, said nut having an annular ratchet extending around its periphery;

    a latch mounted in said housing; and

    operator means for said latch for causing said latch to move from a disengaged position to a second position in which it engages said ratchet on the nut and prevents rotation of the nut in one direction only when the fluid pressure for the braking mechanism drops below a predetermined threshold.

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