×

Communication system for use in a mine

  • US 5,504,809 A
  • Filed: 09/03/1993
  • Issued: 04/02/1996
  • Est. Priority Date: 09/02/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A communication system for use in a mine to provide two-way communication between a conveyance which moves in a mine and a communication network located in the mine, the system comprising:

  • (a) means for producing a signal indicative of the position of the conveyance in the mine;

    (b) a plurality of repeater means situated in the mine and being coupled to said communication network;

    (c) controller means for controlling said repeater means and said controller means being responsive to said signal and having means for activating said repeater means which is proximate to the conveyance so that a communication link is provided between the conveyance and the communication network;

    (d) a plurality of proximity switches at selected locations in the mine, said proximity switches including means for producing a reference location signal in response to the conveyance coming within proximity of said proximity switch and said controller means including means responsive to said reference location signal and means for verifying the position of the conveyance.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×