Powered hammer with a vibration dampening mechanism

Details Powered hammer with a vibration dampening mechanism Powered hammer with a vibration dampening mechanism

2009-03-16

2011-12-13

Nash, Brian D (Department: 3721)

Tool driving or impacting

Impacting devices

With impact cushioning means

C173S162100, C173S162200

Reexamination Certificate

active

08074734

ABSTRACT:
A powered hammer is described comprising a housing, a tool holder mounted on the housing, a percussion mechanism arranged within the housing which mechanism includes a ram reciprocating in a longitudinal direction and being adapted to apply impacts on a tool bit supported in the tool holder, a dampening mass which is slidably mounted in the longitudinal direction within the housing, wherein the dampening mass is biased towards a neutral position by a biasing element and wherein the dampening mass may be deflected from the neutral position against the biasing force of the biasing element. The dampening mass is formed of a ferromagnetic or paramagnetic material or comprises a permanent magnet and a solenoid is arranged within housing adjacent to the dampening mass such that the solenoid applies a force in the longitudinal direction on the dampening mass when being in the neutral position if a current is flowing through the solenoid.

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