Patent ID: 7568739

Claim:
A tool box, comprising a first casing, a second casing pivotally mounted on the first casing, and a locking mechanism mounted between the first casing and the second casing to combine the first casing and the second casing, wherein: the locking mechanism includes a locking unit mounted on the second casing, and a snapping unit mounted on the first casing and detachably locked on the locking unit; the locking unit of the locking mechanism includes a locking block mounted on a periphery of the second casing; the snapping unit of the locking mechanism includes a seat mounted on a periphery of the first casing, a pivot member pivotally mounted on the seat, a snapping member having a first portion pivotally mounted on the pivot member and a second portion that is movable to lock the locking block of the locking unit, and two torsion springs each secured on the seat and each formed with two opposite urging bars urged on the snapping member; the seat of the snapping unit has two ends each formed with two downward extended cutouts, and each of the two torsion springs of the snapping unit is formed with a downward extended limit portion secured in a respective one of the two cutouts of the seat.