Clench wrench

A clench wrench comprising:

• a structure defining a first body defining a handle for a user of the clench wrench to grasp and a second body integrated with the first body and defining an engaging head respectively, wherein the second body has two opposite sides with one side defining a front side and another side defining a back side respectively and includes an engaging space for engaging an object to be driven by the clench wrench, wherein the engaging space extends through the front and back sides and an opening is defined on both the front and back sides, wherein one of the front and back sides includes a clenching member of a clenching device connected thereto, wherein the clenching member is selectively movable between a first position blocking the opening of the engaging space adjacent to the one of the front and back sides and being capable of preventing the object engaged with the engaging space from disengaging therefrom, and a second position in which the opening of the engaging space adjacent to the one of the front and back sides is not blocked, wherein the clenching member is connected to the one of the front and back sides of the second body by a pivot of the clenching device and being pivotal about a pivot axis, with the pivot inserting through a through hole defined by the clenching member and fixed to a first engaging hole defined by the second body;
• and
• a positioning device interacted with the clenching device and configured to limit positions of the clenching member between the first and second positions thereof, wherein the clenching member is limited by a limiter of the positioning device, with the limiter inserted through a groove defined by the clenching member and fixed to a second engaging hole defined by the second body, and wherein the groove is curved and elongated and has a center of curvature located on the pivot axis.