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Roof sensing control of shearer in longwall mining

  • US 4,351,565 A
  • Filed: 03/20/1981
  • Issued: 09/28/1982
  • Est. Priority Date: 07/13/1979
  • Status: Expired due to Fees
First Claim
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1. A mining method utilizing a mining apparatus having at least upper and lower cutting means, comprisingproviding a position detector on said mining apparatus, said detector being vertically moved in association with vertical movement of said lower cutting means,projecting signals from said position detector to measure distance from said position detector to a mine roof, andvertically adjusting the position of said lower cutting means in response to said signals of said position detector so that constant cutting height between the upper and lower cutting means can be obtained when the upper cutting means is adjusted to cut along a seam.

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