Hollow piston hammer device with air equilibration and idle...

Tool driving or impacting – Impacting devices – Hammer head driven by pulsating fluid pressure

Reexamination Certificate

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Details

C173S212000, C173S132000

Reexamination Certificate

active

07726414

ABSTRACT:
An air spring hammer device that includes a drive piston, moving axially back and forth, with a front face of hollow embodiment and a hammer piston moving in said hollow. A ventilation slot is embodied in a guide wall of the drive piston. The drive piston may be guided in a guide tube. The guide tube comprises several idle openings. A moving control element is arranged on the exterior of the guide tube, in which control openings, corresponding to the idle openings, are provided. In an idle operating mode, the control element is in an open position, via which the ventilation slot, the idle openings and the control openings can be brought into connection with the environment.

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