Patent ID: 6814158
Filing Date: 2004-11-09
Classification: B23B,B25F,Y10T

Abstract:
A hand-guided percussion drilling machine, comprising a machine housing; a drilling spindle having an axis; a drive motor for rotatably driving said drilling spindle, said drive motor having a motor shaft; an impact mechanism for strikingly driving said drilling spindle; a tool holder formed as a drilling chuck and screwed with said drilling spindle through a thread, said drilling spindle during exchanging a tool or exchanging said tool holder receiving a releasing or tightening moment; an arresting coupling non-rotatably coupling said drilling spindle relative to said machine housing; an intermediate shaft rotatably connected with said drilling spindle and extending parallel to and at a radial distance from said drilling spindle and at a radial distance from said motor shaft; a component connected with said machine housing; said arresting coupling being arranged between said intermediate shaft, which is located at the radial distance from said drilling spindle and at the radial distance from said motor shaft, and an element selected from the group consisting of said machine housing and said component connected with said machine housing, said arresting coupling opening during a torque transmission from said drive motor to the tool in one direction and closing during a torque transmission from said tool holder in an opposite direction and wherein said arresting coupling is positioned such that it is not subject to strikes of said impact mechanism, said arresting coupling being arranged on said intermediate shaft.