Patent ID: 7311018

Claim:
A wrench comprising: a first handle; a first joint movably mounted on the first handle; and a working unit, with the working unit pivotally connected to the first joint, wherein the first handle pivots relative to the working unit between a first position where the first handle and the working unit extend perpendicular to each other and a second position where the first handle and the working unit extend along a same axis, wherein the working unit comprises a head pivotally connected to the first joint and a core connected to the head, wherein the core is rotationally connected to the head, wherein the working unit comprises a switching device movable between a first position where the head can drive the core in a first direction through the switching device and a second position where the head can drive the core in a second direction through the switching device, wherein the switching device comprises a switch made with two series of dents, wherein the core comprises a series of teeth for engagement with a selected one of the series of dents, and wherein the head defines a circular space and a tunnel in communication with the circular space so that the circular space receives the core and that the tunnel receives the switch.