×

Steering circuit system for a moving vehicle

  • US 5,320,191 A
  • Filed: 01/28/1993
  • Issued: 06/14/1994
  • Est. Priority Date: 01/28/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A steering circuit system for a moving vehicle, comprising:

  • a first hydraulic line;

    a second hydraulic line;

    a hydraulic pump having a discharge line;

    a first steering cylinder having a first expanding chamber and a first contracting chamber;

    a manual operation steering valve connected to the discharge line of the hydraulic pump and having a first position connecting the discharge line with the first contracting chamber by way of the first line, and a second position connecting the discharge line with the first expanding chamber by way of the second line;

    a third hydraulic line;

    a switching valve connecting discharge line to the third line;

    a fourth line having a first pilot operation check valve therein, and a fifth line having a second pilot operation check valve therein, wherein the first pilot operation check valve is constructed to open in response to oil pressure in the fifth line and the second pilot operation check valve is constructed to open in response to pressure in the fourth line;

    an automatic operation steering valve having a first position connecting the third line to the first contracting chamber by way of the fourth line, and having a second position connecting the third line to the first expanding chamber by way of the fifth line.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×