| 摘要 |
A portable power tool comprising a housing having a motor disposed therein. The motor has an output rotary shaft interconnected with a tool bit supporting member by a gear train to transmit rotation to a tool bit. The motor also drives a reciprocating impacting mechanism adapted to strike the rear end of the tool bit and impart a longitudinal blow thereto. A novel retainer carried at the front of the housing prevents the tool bit from coming out of the housing and is manually movable to free the tool bit for removal and replacement.
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