Electric hammer

摘要

The casing of a portable electric percussion tool includes a one-piece casting which carries (a) a cylinder for supporting a reciprocating driver and striker (b) a drive shaft for rotating a tool holder to which blows are transmitted by the striker (c) a bearing for the motor shaft of an electric motor (d) the end portion of the stator enclosure of the motor nearer the said bearing for the motor shaft, and (e) a crankshaft which is driven by the motor shaft through gearing and which drives the drive shaft and reciprocates the driver. The lengthwise axis of the cylinder and the rotational axes of the drive shaft and motor shaft are parallel to each other, and at right angles to the axis of rotation of the crankshaft.