Pneumatic striking mechanism for a drill hammer or chisel hammer

The integration of damping elements within the guide tube using an insert sleeve with a locking mechanism addresses the need for additional fastening devices, enhancing efficiency and impact control in power tools by accommodating larger impactors without complicating the design.

EP4733006A1Pending Publication Date: 2026-04-29HILTI AG
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
HILTI AG
Filing Date
2024-10-28
Publication Date
2026-04-29

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Abstract

Pneumatic impact mechanism for a drill or chisel hammer, comprising a hammer (6) acted upon by a piston (5) for the rear impact of a tool (7), wherein the hammer (6) is arranged longitudinally in an associated guide tube (4) which is equipped with end-side damping means for the rebound and idle impact damping of the hammer (6), wherein the damping means comprise an insert sleeve (9) arranged in the tool-side area of ​​the guide tube (4) for forming an additional mass for idle impact damping, which is inserted into the guide tube (4) in a captive manner by a bore shoulder of the guide tube (4) formed by an undercut section (11a) forming a rear end stop (12) for the insert sleeve (9).
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Citation Information

Patent Citations

  • Manual tool machine

    CN102554877A

  • Handheld machine tool

    DE102011081617A1

  • Handheld power tool

    CN105612030A