| 摘要 |
A utility knife with an auto-retractable blade, having a housing containing a blade therein. An actuator is provide being fixed to a slider contained in the housing and slidable with respect to the housing. The slider, having an upper hook and a lower hook an d being able to coact with an upper protrusion and a lower protrusion of a blade seat als o contained in the housing, are able to automatically retract into the housing after the blade leaves a workpiece and before a user of the knife releases the actuator for extending the blade. The blade will not undesirably move backward in cutting.
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