Steering system for crane

CAFC
  • US 7,798,274 B2
  • Filed: 04/14/2009
  • Issued: 09/21/2010
  • Est. Priority Date: 02/15/2005
  • Status: Active Grant
First Claim
Patent Images

1. A steering system for controlling the steering mode of a lifting apparatus comprising:

  • a frame structure having a first front wheel proximate a front portion of a first side of the frame structure, a second front wheel proximate a front portion of a second side of the frame structure, a first rear wheel proximate a rear portion of the first side, and a second rear wheel proximate a rear portion on the second side;

    a user interface capable of placing the apparatus in a carousel steering mode; and

    ,a controller communicatively coupled to the user interface, the controller configured to control movement of the first and second front wheels and the first and second rear wheels in response to placing the apparatus in the carousel steering mode, and wherein the controller is configured to turn each of the first front wheel, second front wheel, first rear wheel and second rear wheel one of clockwise and counterclockwise in a manner to minimize the amount of turning required by each respective wheel to place the apparatus in the carousel steering mode, and further comprising;

    a first sensor for monitoring the angular position of the first front wheel;

    a second sensor for monitoring the angular position of the second front wheel;

    a third sensor for monitoring the angular position of the first rear wheel; and

    ,a fourth sensor for monitoring the angular position of the second rear wheel;

    the first, second, third and fourth sensors coupled to the controller wherein the controller monitors the angular positions of the wheels and when one of the wheels exceeds a predetermined distance between a sensed position and a programmed position for the wheel, the controller stops angular movement of the remaining wheels.

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