Electric hammer drill

Details Electric hammer drill Electric hammer drill

2008-06-10

2008-06-10

Rada, Rinaldi I. (Department: 3721)

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

C173S104000, C173S109000, C173S117000

Reexamination Certificate

active

07383893

ABSTRACT:
It is an object of the present invention to provide an effective technique to alleviate vibration in the electric hammer drill. According to the invention, representative electric hammer drill is provided with a body, a motor, a striker, a cylinder, first and second power transmitting mechanisms, a power switching mechanism, a mode changing mechanism, and a coupling mechanism. The mode changing mechanism is disposed on the upper surface of the body and can change between a hammer-drill mode and a hammer mode. The coupling mechanism is disposed between the mode changing mechanism and the power switching mechanism. The coupling mechanism extends along the peripheral surface of the cylinder and transmits the mode changing movement of the mode changing mechanism to the power switching mechanism by moving in the longitudinal direction of the cylinder. Because the mode changing mechanism is disposed on the upper surface of the body and the coupling mechanism extends along the peripheral surface of the cylinder to move in the longitudinal direction of the cylinder, the center of gravity of the electric hammer drill is positioned nearer to the axis of the cylinder, compared with the known art in which the components for the switching the operation modes are centralized in one area. As a result, operating vibration of the electric hammer drill is effectively alleviated.

REFERENCES:
patent: 4763733 (1988-08-01), Neumaier
patent: 5775440 (1998-07-01), Shinma
patent: 5842527 (1998-12-01), Arakawa et al.
patent: 6015017 (2000-01-01), Lauterwald
patent: 6176321 (2001-01-01), Arakawa et al.
patent: 6557648 (2003-05-01), Ichijyou et al.
patent: 6619149 (2003-09-01), Funfer
patent: 7121359 (2006-10-01), Frauhammer et al.

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