主权项 |
1. An advancing mechanism for a fixture, the fixture including an elongated rod, a first jaw and a second jaw, the first jaw and the second jaw being assembled with the elongated rod, the second jaw having a pivotal portion and a grip, a trigger being connected outside the pivotal portion, a front chamber being formed in the pivotal portion for receiving a plurality of clasping pieces and a restoring spring penetrated by the elongated rod, the restoring spring pushing the clasping pieces to synchronously drive a push rod connected to the trigger;
characterized in that: a clasping piece facing the restoring spring is formed into an angled shape with a tapered groove, the restoring spring is formed with a guiding section bent toward the clasping pieces, the guiding section is disposed in the groove to guide the second jaw, and a bottom of the groove is inclined. |