×

Apparatus and method for controlling a hydraulic excavator

  • US 4,805,086 A
  • Filed: 10/19/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 04/24/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for an excavator for use with a laser emitting a planar laser beam at a predetermined elevation, said excavator having a frame, cutting means, connecting means for connecting said cutting means to said frame and actuation means for moving said cutting means with respect to a point on said frame, said connecting means including a stick member movable with respect to said frame and a bucket movable with respect to said stick member, said system comprising:

  • laser receiving means on said stick member for producing a signal when contacted by the laser beam;

    connecting means angle sensing means on said stick member for sensing the angle between said stick member and an earth reference;

    laser receiving means relative position determining means responsive to said connecting means angle sensing means for producing a first representation proportional to the distance between said laser receiving means when contacted by the laser beam and said point;

    means for storing said first representation;

    cutting means relative position determining means responsive to said connecting means angle sensing means for determining the distance between said cutting means and said point at different positions of said bucket relative to said stick member and producing a second representation proportional to the distance between said cutting means and said point; and

    cutting means absolute position determining means for combining said first and second representations to produce a third representation proportional to the distance of said cutting means from the laser plane.

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