| 摘要 |
PURPOSE: A safety hand drill using a detachable pipe and a reciprocating lever is provided to drill an accurate position and prevent accidents by reciprocating the drill with the lever after securing a screw on the drill. CONSTITUTION: A safety hand drill comprises a detachable pipe(1), motor(2), a bar(3), and a reciprocating lever(4). The pipe is attached to the drill for securing a screw on the front side of the drill. The lever pushes the bar attached to the rear side of a motor. As a user operates the drill and pushes the lever with hand, the screw gradually enters an object.
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