Tool driving or impacting – Impacting devices – Hammer head driven by electric motor
Reexamination Certificate
2005-06-21
2005-06-21
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by electric motor
C173S162100, C173S201000, C173S211000, C173S049000
Reexamination Certificate
active
06907943
ABSTRACT:
It is, accordingly, an object of the present invention to provide an electric hammer with improved construction, while ensuring the vibration reduction performance. According to the present invention, a representative electric hammer may include a hammer bit, a driving motor, a crank mechanism and a counter weight. The crank mechanism drives a striker by converting a rotating output of the driving motor to linear motion in the axial direction of the hammer bit. The counter weight is detachably mounted to the crank mechanism and serves to reduce vibration of the striker. According to the representative hammer, because the counter weight is detachably mounted to the crank mechanism, it is possible to switch between the mode in which the counter weight is mounted on the hammer body in order to reduce and alleviate vibration and the mode in which the counter weight is removed from the hammer so that the operation can be performed with the hammer having a lighter weight and slimmer appearance. Thus, utility of the electric hammer can be improved.
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Lahive & Cockfield LLP
Laurentano, Esq. Anthony A.
Makita Corporation
Smith Scott A.
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