Michael P Macdonald

US Patent:

6779961, Aug 24, 2004

Filed:

Oct 29, 2001

Appl. No.:

10/013051

Inventors:

Joseph S. Barney - Carlisle PA
Michael P. Macdonald - Chambersburg PA

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

B66C 2304

US Classification:

414728, 414699, 414685, 212278

Abstract:

The present invention is directed to a material handler that includes a frame, a telescoping boom, a boom extension sensor, a boom angle sensor, and a control system. The telescoping boom is coupled to the frame, pivotable between a lowered and a raised position, and movable between a retracted and an extended position. The boom extension sensor generates a first signal that corresponds to the distance which the boom is extended. The boom angle sensor generates a second signal that corresponds to the angle which the boom is pivoted. The control system receives the signals and displays a cursor located at a position that is based on the first signal and the second signal.