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VEHICLE BRAKE

  • US 3,826,176 A
  • Filed: 06/28/1972
  • Issued: 07/30/1974
  • Est. Priority Date: 09/21/1970
  • Status: Expired due to Term
First Claim
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1. A vehicle brake comprising:

  • a housing, a brake operating member mounted in said housing for reciprocable movement between brake operating and brake releasing positions, a piston within said housing and positioned with respect to said brake operating member for movement therewith, said piston being held by said brake operating member in a manner to be movable with respect thereto a short fixed distance, a captive air chamber containing a body of fluid under pressure in said housing at one side of said piston with the fluid pressure of said captive chamber applied to said piston in a manner to move said brake operating member to said brake operating position, a pressure chamber on the opposite side of said piston from said captive air chamber with said pressure chamber having a port for the introduction of pressurized fluid to move said piston in opposition to said captive body fluid pressure, and a mechanical lock including means for locking said brake operating member against movement relative to said housing toward said brake releasing position when fluid pressure is released from said pressure chamber and additionally including means for unlocking said mechanical lock in response to introduction of pressurized fluid into said pressure chamber, said locking means including a one-way lock for permitting said brake operatingmember to move toward said brake operating position while locking said brake operating member agains movement in the opposite direction, said unlocking means including an unlocking device connected between said piston and said one-way lock for movement with respect to said brake operating member responsive to the introduction of fluid under pressure into said pressure chamber for locking said one-way lock, thereby permitting movement of said brake operating member to said brake releasing position, said mechanical lock additionally including an expansible support that comprises a first member adapted to engage said housing, a second member adapted to engage said piston and move therewith and a link extending between said first and second members with said link having an aperture surrounding one of said members and an end engaging the other of said members for pivoting said link to grip said one member in said aperture when said members are mvoed in one direction with respect to each other.

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