Automatic wrench for screwing a pipe string together and apart

Details Automatic wrench for screwing a pipe string together and apart Automatic wrench for screwing a pipe string together and apart

1983-02-22

1985-05-07

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Responsive to movement of work

81 5734, 81409, B25B 2300

Patent

active

045150451

ABSTRACT:
An automatic wrench comprises a high-torque, a low-torque, and a locking device. The wrench control system includes a torque detector and a rotation angle detector, in response to whose signals passing through an AND gate a control unit delivers a command to end the thread tighening by the rotation actuator of the high-torque device in screwing a pipe string together or to end the initial loosening of the thread with the aid of the same actuator in screwing it apart. The control unit incorporates a unit for monitoring the duration of the command execution, which stops operation of the high-torque device if no signal comes from said AND gate during the time alloted to accomplish the tightening or the initial loosening of the thread.

REFERENCES:
patent: 3368396 (1968-02-01), Van Burkleo et al.
patent: 3545313 (1970-12-01), Kelley
patent: 3745820 (1973-07-01), Weiner
patent: 3799099 (1974-03-01), Guier
patent: 4023449 (1977-05-01), Boyadjieff
patent: 4176436 (1979-12-01), McCombs et al.
patent: 4280380 (1981-07-01), Eshghy

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