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A tool box includes a first casing, a second casing, and a locking mechanism. The locking mechanism includes a locking unit, and a snapping unit. The locking unit includes a locking block. The snapping unit includes a seat, a pivot member, a snapping member, and two torsion springs. Thus, the lockin

A tool box includes a first casing, a second casing, and a locking mechanism. The locking mechanism includes a locking unit, and a snapping unit. The locking unit includes a locking block. The snapping unit includes a seat, a pivot member, a snapping member, and two torsion springs. Thus, the locking mechanism is operated to open the tool box automatically, so that a user can open the tool box easily and conveniently, thereby facilitating the user operating the locking mechanism to open the tool box.

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What is claimed is: 1. 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 un

What is claimed is: 1. 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. 2. The tool box in accordance with claim 1, wherein the two urging bars of each of the two torsion springs of the snapping unit have the same length and are extended outward along two opposite directions in an oblique manner. 3. The tool box in accordance with claim 1, wherein the two urging bars of each of the two torsion springs of the snapping unit have top portions located at the same horizontal height, so that the snapping member is disposed at a horizontal state by pressing of the two urging bars of each of the two torsion springs. 4. The tool box in accordance with claim 1, wherein the locking block of the locking unit has a side formed with a protruding locking rib, and the second portion of the snapping member of the snapping unit is formed with a hook-shaped snapping portion that is movable to lock the locking rib of the locking block of the locking unit. 5. The tool box in accordance with claim 4, wherein the locking rib of the locking block of the locking unit is semi-circular. 6. The tool box in accordance with claim 1, wherein the seat of the snapping unit has an end face formed with a mounting recess, and the snapping unit of the locking mechanism further includes a catch mounted in the mounting recess of the seat to limit the limit portion of each of the two torsion springs, so that each of the two torsion springs is not rotated or displaced by an external force. 7. The tool box in accordance with claim 6, wherein the mounting recess of the seat is formed with two screw bores, and the snapping unit of the locking mechanism further includes two locking screws each extended through the catch and each screwed into a respective one of the two screw bores of the seat to secure the catch on the seat. 8. The tool box in accordance with claim 1, wherein the pivot member of the snapping unit is substantially U-shaped. 9. The tool box in accordance with claim 1, wherein the pivot member of the snapping unit has two opposite sides each having an end formed with a pivot bore, the snapping member of the snapping unit has two opposite sides each formed with a pivot bore, and the snapping unit of the locking mechanism further includes a pivot shaft extended through the pivot bore of each of the two opposite sides of the snapping member and the pivot bore of each of the two opposite sides of the pivot member. 10. The tool box in accordance with claim 9, wherein the snapping member of the snapping unit has a substantially inverted U-shaped cross-section. 11. The tool box in accordance with claim 1, wherein the first portion of the snapping member of the snapping unit is formed with a drive portion extended upward in an oblique manner. 12. 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 a side formed with a pivot hole, the pivot member of the snapping unit has two opposite sides each having an end formed with a pivot hole, and the snapping unit of the locking mechanism further includes a pivot shaft extended through the pivot hole of each of the two opposite sides of the pivot member, the two torsion springs and the pivot hole of the seat. 13. The tool box in accordance with claim 12, wherein the pivot hole of the seat is substantially C-shaped.