| 摘要 |
An electrically-operated multi-needle chisel tool including a housing having a front portion and a rear portion. An electric motor is mounted in the rear portion. A cylinder extends forwardly from the front portion of the housing. A piston is disposed in said cylinder for reciprocable linear motion which is converted from the rotary motion of the motor. An anvil is axially slidably supported in the cylinder and positioned forward of the piston so as to be hit by the piston. A needle supporter is axially slidably supported in the cylinder and positioned forward of the anvil so as to be hit by the anvil. A number of needle chisels are individually supported by the needle supporter for axially slidable movement, and a return spring disposed in the cylinder for returning the needle supporter, the piston, the anvil and the needle supporter being adapted to be synchronously reciprocated by the motor. The piston includes a base portion and a reduced diameter shaft portion extending forwardly from the base portion. A hollow generally cylindrical hammer is axially slidably fitted over the fore end portion of the shaft portion of the piston in opposed relation to the anvil. A buffer compression spring is disposed around the shaft portion between the base portion of the piston and the rear end of the hammer.
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