Rotary hammer

摘要

A rotary hammer is adapted to impart axial impacts to a tool bit. The rotary hammer includes a motor, a spindle coupled to the motor for receiving torque from the motor, and a piston at least partially received within the spindle for reciprocation therein. A crank hub is coupled to the motor for receiving torque from the motor. The crank hub defines a rotational axis and includes a socket offset from the rotational axis. A pin includes a first portion at least partially received within the socket and a second portion fixed to the piston. The first portion of the pin is both pivotable within the socket and axially displaceable relative to the socket in response to rotation of the crank hub for reciprocating the piston between a forward-most position within the spindle and a rearward-most position within the spindle.

主权项

1. A rotary hammer adapted to impart axial impacts to a tool bit, the rotary hammer comprising:
a motor including an output shaft that defines a motor axis; a spindle coupled to the motor for receiving torque from the motor; a piston at least partially received within the spindle for reciprocation therein; a crank hub coupled to the motor for receiving torque from the motor, the crank hub defining a rotational axis coaxial with the motor axis and including a socket offset from the rotational axis; a pin including a first portion at least partially received within the socket and a second portion fixed to the piston to inhibit relative movement between the pin and the piston, the first portion of the pin being both pivotable within the socket and axially displaceable relative to the socket in response to rotation of the crank hub for reciprocating the piston between a forward-most position within the spindle and a rearward-most position within the spindle; and a mode selection mechanism including a first coupler movable along the rotational axis to selectively connect and disconnect the spindle and the motor, and a second coupler movable along the rotational axis to selectively connect and disconnect the crank hub and the motor.