Hammer drill

Details Hammer drill Hammer drill

B - Operations, Transporting

23

B

B23B 45/16 (2006.01)

Patent

CA 2556217

A hammer drill comprises a casing, and an electric motor mounted within the casing. A drive shaft is connected in driven relation to the electric motor, and defines a longitudinal axis. A drill hit chuck is mounted in driven relation to the drive shaft. An impact member having at least one impact portion is mounted in fixed relation on the drive shaft for rotation therewith. An actuator mechanism has at least one roller member rotationally mounted thereon. The actuator mechanism is mounted in freely rotatable relation on the drive shaft for longitudinal sliding movement along the drive shaft between an operatively engaged position whereat the at least one roller member engages the impact surface of the impact member as the drive shaft rotates with respect to the actuator mechanism, so as to thereby impart reciprocating motion along the longitudinal axis to the drive shaft and the drill bit chuck, and a disengaged position whereat the at least one roller member is removed from the engagement with the impact surface of the impact member.

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