| 摘要 |
A hammer comprising: a housing 2 ; a motor mounted within the housing; a tool holder 8 rotatably mounted on the housing 2 for holding a cutting tool; a striker 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 8 , which striker is reciprocatingly driven by the motor, when the motor is activated, via a drive mechanism; wherein the drive mechanism comprises: a pivoting drive arm pivotally mounted within the housing 2 at one end; a pivotal drive mechanism connected to the pivoting drive arm which converts a rotary movement generated by the motor to a pivoting movement of the pivoting drive arm about its pivot point the pivotal drive mechanism comprising a circular cam formed around the circumference of a lengthwise section of a rotatable shaft and a cam follower connected to the pivoting drive arm which engages with the camand follows the path of the cam when the shaft is rotated; characterised in that a spring is provided, one end of which is fixedly connected to the end, remote from the pivot point, of the pivoting drive arm, the other end of which is fixedly connected striker.
|
