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Clutch-clutch-brake steering mechanism for tractors

  • US 4,538,641 A
  • Filed: 08/23/1984
  • Issued: 09/03/1985
  • Est. Priority Date: 10/16/1978
  • Status: Expired due to Fees
First Claim
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1. For use in a fluid pressure system including high pressure, drain pressure, and common clutch-brake, inlet-outlet conduits:

  • pressure setting valve assembly means having a bore therein communicating with said conduits and controllably connecting the high and drain pressure conduits for generating a common clutch-brake pressure in the inlet-outlet conduit;

    said valve assembly means including a metering spool disposed in said bore and actuating means for selectively moving said spool within said bore, said actuating means being responsive to the generation of said common clutch-brake pressure to move said spool for affording inlet-outlet flow in said inlet-outlet conduit; and

    a shuttle in the spool having first and second operating positions, said spool including bypass means communicating with said drain conduit, and spool actuating means for placing said shuttle in said first position for communicating said inlet-outlet conduit with said bypass means and in said second operating position for blocking communication between said bypass means and said inlet-outlet conduit. PG,55

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