Tool driving or impacting – Impacting devices – Hammer head driven by pulsating fluid pressure
Reexamination Certificate
2011-06-28
2011-06-28
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by pulsating fluid pressure
C173S109000, C173S162100, C173S212000
Reexamination Certificate
active
07967078
ABSTRACT:
It is an object of the invention to provide a rational forced vibration of a dynamic vibration reducer in an impact tool that linearly drives a tool bit in an axial direction of the tool bit via a swinging member.An impact tool includes a motor111, a swinging member129that swings in the axial direction of a tool bit119by rotation of the motor111, a driving element141that is caused to reciprocate by swinging movement of the swinging member129and a first air chamber143ain which pressure is fluctuated by reciprocating movement of the driving element141, and the tool bit119is driven by pressure fluctuations of the first air chamber143a. The impact tool further includes a second air chamber163in which pressure is fluctuated by swinging movement of the swinging member129, and a dynamic vibration reducer151having a weight155and an elastic element157which exerts a biasing force on the weight155. The weight155under the biasing force of the elastic element157is forcibly vibrated by pressure fluctuations of the second air chamber163.
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European Search Report issued Feb. 10, 2011 in European Application No. EP 09 01 1068.
Makita Corporation
Oliff & Berridg,e PLC
Smith Scott A.
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