3662842 is referenced by 73 patents and cites 6 patents.

In an automatic coupling system, a threaded quill is connected to a rotating and advancing mechanism by a slip coupling and is biased toward a drill pipe by a spring. In the use of the system, the quill is advanced toward the drill pipe and is simultaneously rotated with respect to the pipe. When the quill engages the pipe, it slips relative to the advancing and rotating mechanism against the action of the spring until a quill advance terminating switch is closed. The rotation of the quill is continued until the torque on the quill reaches a predetermined limit.

Automatic coupling system
Application Number
Publication Number
Application Date
April 14, 1970
Publication Date
May 16, 1972
Bromell Raymond J
Automatic Drilling Machines
E21b 19/16
B23p 19/04
E21B 19/00
E21B 19/16
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