Hand-held power tool with pneumatic percussion mechanism

Details Hand-held power tool with pneumatic percussion mechanism Hand-held power tool with pneumatic percussion mechanism

2011-05-31

2011-05-31

Low, Lindsay (Department: 3721)

Tool driving or impacting

Impacting devices

With impact cushioning means

C173S201000, C173S128000, C173S104000

Reexamination Certificate

active

07950471

ABSTRACT:
A hand-held power tool includes a percussion power tool includes a percussion piston (5) for applying blows to an anvil (8) axially displaceable in a guide tube (6) within limits defined by two, spaced from each other, stops (9a,9b) arranged in the guide tube (6), a pneumatic percussion mechanism (2) for driving the percussion piston (5), an air spring (3) for connecting the percussion piston (5) with the percussion mechanism (2), and an impact ring (12) arranged coaxially with the anvil (8) outwardly thereof and having spaced from each other, inner radical flanks (14) located on opposite axial sides of the outer radial collar (11) provided on the anvil (8), with the impact ring (12) freely axially displaceable, within limits, relative to the outer radial collar (11) and having an outer diameter smaller than a guiding inner diameter of the guide tuber (6), and with a mass ratio of the impact ring (12) to the anvil (8) being equal at least 0.25.

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