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Steering control for tractor grader attachments

  • US 3,957,130 A
  • Filed: 07/15/1974
  • Issued: 05/18/1976
  • Est. Priority Date: 07/31/1972
  • Status: Expired due to Term
First Claim
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1. In a steerable mobile assembly:

  • a powered vehicle equipped with a fluid-actuated, power steering system and a front wheel and axle structure having a steering mechanism provided with a fluid operated actuator operably coupled with said power steering system;

    a tool-supporting frame provided with a ground-engaging front wheel and axle unit having a steering apparatus which includes a fluid-operated actuator;

    means releasably securing said frame to said vehicle with said frame extending forwardly of said vehicle wheel and axle structure and supporting the latter in a raised, non-ground-engaging disposition; and

    releasable coupling means operably interconnecting the actuator of said frame axle unit steering apparatus in flow communication with the power steering system of said vehicle to render the front wheel and axle unit of said frame responsive to actuation of the power steering system whereby turning movement of the mobile assembly is responsive solely to operation of the steering apparatus of said frame front wheel and axle unit,said coupling means including selectively positionable flow-directing means,said flow-directing means being positionable in a first position in which the actuator of said vehicle steering mechanism is rendered nonoperative and the actuator of said frame steering apparatus is rendered operative in response to actuation of the power steering system,said flow-directing means being further positionable in a second position for rendering the actuator of said vehicle steering mechanism operative in response to actuation of the power steering system when said frame is removed from the vehicle and said coupling means are released to remove the actuator of the frame steering apparatus from said communication.

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