Hand power tool

US5996707A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ludwig Thome · Echterdingen, DE
• Karl Frauhammer · Echterdingen, DE
• Manfred Hellbach · Echterdingen, DE
• Gerhard Meixner · Echterdingen, DE
• Heinz Schnerring · Waldenbuch, DE
• Manfred Klein · Highland Park, US

Key dates

• Filing date: Oct 28, 1996
• Grant date: Dec 7, 1999
• Expiry date: Oct 28, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D16/003
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A hand power tool has a machine housing, a drive motor accommodated in the machine housing, a drive train connected with the drive motor and provided with a tool receptacle for rotation of a tool insertable in the tool receptacle, a detecting device for detecting an uncontrolled operation of the hand power tool by detecting a blocking of the tool in a workpiece with a resulting impact-like turning of the machine housing, a blocking device provided for the drive train and releasable by the detecting device, the locking device having a locking toothing arranged in the drive train and a blocking member movably supported in the machine housing and form-lockingly engagable in the locking toothing so as to non-rotatably fix the drive train relative to the machine housing, the detecting device being formed so that it produces an electrical release signal in an uncontrolled operation, the blocking device being releasable by the electrical release signal, and further has electromagnet device actuatable by the release signal so that the locking member is engagable by the electromagnet device into the locking toothing.