Robert L Hirsch

US Patent:

49680986, Nov 6, 1990

Filed:

Sep 11, 1989

Appl. No.:

7/405365

Inventors:

Robert L. Hirsch - Dallas TX
Fred W. Ng - Dallas TX
Amjad A. Bseisu - Dallas TX

Assignee:

Atlantic Richfield Company - Los Angeles CA

International Classification:

E21C 3524

US Classification:

299 1

Abstract:

A continuous mining apparatus such as a coal milling or shearing machine includes sensors mounted on the machine frame or on the cutter bits, including an accelerometer and one or more strain gauges, for sensing vibrations and stresses exerted on the cutter bits during operation of the machine. A signal conditioning and amplification circuit provides an audio and/or visual display indicating when the cutter is moving outside of the coal seam and/or is cutting along a cleat or other joint to improve excavation rates while maintaining or lowering stress levels on the cutter bits. The display enables the machine operator to keep from penetrating the roof or floor of the coal seam and to position the cutter to take advantage of natural fracture lines in the seam. The frequency spectrum of the sensor signals is determined to distinguish vibrations caused by bit interaction with the material being cut.

Address:

846 Good Hope Dr, Castle Rock, CO 80108

Phone:

3036606482

VIN:

2HKYF18597H522128

Make:

HONDA

Model:

PILOT

Year:

2007