Hilti Aktiengesellschaft

Alexander Loeffler

Reinhard Schulz

Erwin Manschitz

A hand-held power tool includes a motor-driven percussion mechanism. The percussion mechanism includes a guide tube () and a reciprocating driving member () displaceable in the guide tube () for driving, via a gas spring, an impact member () likewise displaceable in the guide tube (). The percussion mechanism further includes a motor-driven eccentric wheel () rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X). A connection rod () is eccentrically supported on the eccentric wheel () and connected to the driving member () for converting a rotational movement of the eccentric wheel () into a reciprocating movement of the driving member ().

Hand-held power tool with a pneumatic percussion mechanism

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

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Kaufering, Germany

Alexander Loeffler