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HYDRAULIC PRESSURE MODULATOR FOR USE IN ADAPTIVE BRAKING SYSTEMS

  • US 3,669,403 A
  • Filed: 10/20/1969
  • Issued: 06/13/1972
  • Est. Priority Date: 03/13/1968
  • Status: Expired due to Term
First Claim
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1. In a modulating means incluDing a flexible diaphragm means for dividing a first interior portion of said modulating means into first and second expansible chambers, means for normally urging said diaphragm means to expand said first chamber and contract said second chamber;

  • first valve means having at least two ports and cooperating with said diaphragm means for allowing communication between said two ports when said first chamber is expanded and for interrupting communication between said two ports when said second chamber is expanded;

    a first chamber port for communicating said first chamber to sink for fluid;

    valve means actuable for communicating said second chamber with a source of said fluid at a relatively high pressure to thereby cause said second chamber to expand;

    an improvement comprising;

    additional valve means independently actuable for providing, when actuated, substantially free communication between said first and second chambers for expanding said first chamber.

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