Vibration dampening mechanism

Details Vibration dampening mechanism Vibration dampening mechanism

B - Operations, Transporting

25

D

B25D 16/00 (2006.01) B23B 45/16 (2006.01)

Patent

CA 2541417

A hammer drill comprising: a body 2 in which is located a motor; a tool holder 6 capable of holding a tool bit; a hammer mechanism, driven by the motor when the motor is activated, for repetitively striking an end of the tool bit when the tool bit is held by the tool holder 6; a counter mass 20; 50 slideably mounted within the body 2 which is capable of sliding in a forward and rearward direction between two end positions; biasing means 22; 24; 32, 34;62 which biases the counter mass 20; 50 to a third position located between the first and second positions; wherein the counter mass is located above the centre of gravity 9 of the hammer; the mass of the counter mass 20; 50 and the strength of the biasing means 22; 24; 32, 34;62 being such that the counter mass 20; 50 slidingly moves in forward and rearward direction to counteract vibrations generated by the operation of the hammer mechanism. The biasing means may be a leaf spring or a helical spring. The leaf spring may be constructed in a layer fashion. The counter mass may be slideably supported on rods and may be able to twist about a number of axes.

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