Clamping device and hand-held power tool

EP4227040B1Active Publication Date: 2026-05-27HILTI AG
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
HILTI AG
Filing Date
2018-10-16
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Existing clamping devices for tool discs in hand-held power tools are prone to self-loosening during operation, leading to potential detachment of the tool disc.

Method used

A clamping device with a screw mounted in a coupling module that is positively locked and rotationally secured to the drive spindle, featuring a disc spring to seal a grease chamber and axially preload a hand knob, and a rolling bearing to enhance clamping force and prevent unintentional loosening.

Benefits of technology

The clamping device effectively prevents tightening or loosening during operation by ensuring a secure, rotationally fixed connection between the coupling module and drive spindle, enhancing handling ease and clamping force without requiring additional tools.

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Abstract

Clamping device (10) for axially (AR) clamping a tool disc (300) to a flange (30) associated with a drive spindle (20) of a hand-held power tool (100), wherein the clamping device (100) has a screw (2) which, for clamping the tool disc (300), is to be screwed into an internal thread (22) of the drive spindle (20), wherein the screw (2) is mounted in a coupling module (1) of the clamping device (10), wherein the coupling module (1) has an inner contour (16) which is or can be paired with the drive spindle (20) in a form-fitting and rotationally secure manner in the circumferential direction (U).
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