| 摘要 |
A utility knife includes a handle having a first casing and a second casing, a blade holder slidably received in the handle, a blade mounted on the blade holder, means for driving the blade holder moving, and a lock device pivoted on the first casing of the handle to be turned between an unlock position and a lock position. The lock device is fastened on the first casing having a base member positioned at an exterior side of the first casing and a rotatable member positioned at an interior side thereof The rotatable member has two ribs projected radially to pass through a through hole with two gaps on first casing. Such that the first casing and second casing can be assembled and disassembled by turning the lock device.
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