Walk-behind trenching machine

  • US 7,644,524 B2
  • Filed: 09/11/2007
  • Issued: 01/12/2010
  • Est. Priority Date: 09/11/2007
  • Status: Active Grant
First Claim
Patent Images

1. A walk-behind steerable trencher, comprising:

  • a frame;

    two independently powered and spaced-apart, ground-engaging drive members positioned on opposing sides of the frame;

    a trenching boom comprising;

    an elongate boom guide;

    an attachment arm defining a transverse pivot joint for pivotally attaching a proximal end of the boom guide to a forward portion of the frame, the transverse pivot joint defining a first transverse axis;

    an endless cutting element movable along a perimeter of the boom guide; and

    a drive unit attached to the attachment arm, the drive unit for moving the cutting element along the perimeter of the boom guide, wherein the drive unit comprises a driven axle defining a second transverse axis that is offset from the first transverse axis; and

    an actuator coupled between the frame and the trenching boom, the actuator operable to pivot the trenching boom, about the first transverse axis, from an operating position, wherein a distal end of the boom is below a ground surface, to a transport position, wherein a distal end of the boom is elevated forward of the forward portion of the frame such that a lowermost portion of the cutting element is positioned above an inclined plane that extends upwardly, forwardly, and tangentially from a forwardmost portion of one of the ground-engaging drive members at an angle of 25 degrees or more from horizontal.

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