×

Coal seam sensor

  • US 4,143,552 A
  • Filed: 03/01/1978
  • Issued: 03/13/1979
  • Est. Priority Date: 03/01/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. A horizon control sensor for a coal mining machine having at least one support arm on which is mounted a rotatable cutting tool, comprising:

  • at least one vibration transducer mounted on the support arm to sense the sonic vibrations of the rotatable cutting tool and generate an electrical signal representative thereof,filter means for extracting from said vibration signal at least one narrow band of frequencies at and near a preselected resonant frequency of the cutting tool, andsignal processing means for deriving from an extracted resonant peak a discriminant for distinguishing engagement of the cutting tool with the interface between coal and rock and other coal seam enclosing materials.

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