| 摘要 |
A hammer includes a housing; a motor mounted within the housing; and a tool holder rotatably mounted on the house for holding a cutting tool. A striker is mounted in a freely slideable manner within the housing, for repetitively striking an end of a cutting tool when a cutting tool is held by the tool holder. The striker is reciprocatingly driven by the motor, when the motor is activated, via a drive mechanism. The drive mechanism comprises: a pivoting drive arm pivotally mounted within the housing at one end and which is drivingly connected to the striker; a pivotal drive mechanism connected to the pivoting drive arm and which converts a rotary movement generated by the motor into an oscillating pivotal movement of the pivoting drive arm; and the amplitude of the oscillations of the pivoting drive arm can be adjusted.
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