×

AUTOMATIC CONTROL FOR ROTARY DRILL

  • US 3,613,805 A
  • Filed: 09/03/1969
  • Issued: 10/19/1971
  • Est. Priority Date: 09/03/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. A rotary earth-boring drill having a drill mounted for rotary and axial feed motion, a controlled rotary drive motor connected to rotate said drill, and a controlled downfeed drive motor connected to axially downfeed and hoist said drill, in combination therewith, a depth counter system having a pulse-generating member connected to be driven by said downfeed drive motor to generate a pulse signal for each increment of downfeed movement, and an adjustable counter connected to receive said pulses and to register said pulses and to energize a relay when a preset number of pulses have been generated;

  • and a downfeed drive control connected to cause said downfeed drive motor to hoist said drill when said relay is energized.

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