Patent ID: 7093670

Claim:
An impact drill for boring a workpiece comprising: a main frame; a motor housed in the main frame; a spindle supported by the main frame and rotatable by the motor and movable in its axial direction; a first ratchet rotatable together with the rotation of the spindle and movable in the axial direction together with the spindle; a second ratchet positioned in confrontation with the first ratchet and movable in the axial direction but unrotatable about its axis, wherein repeated abutment between the first ratchet and the second ratchet when the spindle is moved to a first axial position causes axially reciprocating movement in the spindle; a first spring biasing the second ratchet in a first axial direction; and a second spring biasing the second ratchet in a second axial direction opposite to the first axial direction.