| 摘要 |
A pair of pivotally connected jaws accommodate a rotatable ring gear of two parts which are locked together when the jaws are closed, but are separated and disposed in the respective jaws when the jaws are opened for application or removal of the wrench to or from a pipe. The ring gear carries adjustable grippers for engaging the pipe, and a motor drive for the ring gear may be a portable electric drill mounted on one of the jaws.
|
