| 摘要 |
<p>A dual advance rate pressure device including a first element (12) having a first jaw (14) and a second element (16) having a second jaw (18). A first member (22) has a first threaded portion (24) engaging a first threading (26), and a second member (27) has a second threading (28). There is a second threaded portion (30), engaging said second threading and mounted on said second element so as to be movable, in response to a predetermined force acting between said first and second jaws, from a first, unlocked, position, in which the thread axis (33) of said second threaded portion substantially coincides with the thread axis (29) of said second threading, to a second, locked, position in which the thread axis of said second threaded portion is shifted with respect to the thread axis of the second threading. There is also a mechanical resister (32) which prevents relative rotation between said first member and said second member when said second threaded portion is in said first position.</p> |
