Hand power tool, in particular drill hammer and/or jackhammer

US7303026B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl Frauhammer · Echterdingen, DE
• Heinz Schnerring · Waldenbuch, DE
• Willy Braun · Neustetten, DE
• Axel Kuhnle · Freiberg, DE

Key dates

• Filing date: May 23, 2005
• Grant date: Dec 4, 2007
• Expiry date: Sep 13, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D2250/321
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A hand power tool has a housing, and drive motor accommodated in the housing, a tool receptacle in which a tool is guided, a gear mechanism, a driving gear, and rotary sleeve arranged so that via the gear mechanism, the driving gear, and the rotary sleeve the tool receptacle is drivable in rotation, a crank drive mechanism and a hammering mechanism located inside the rotary sleeve so that the tool receptacle is drivable through the crank drive mechanism and the hammering mechanism translationally, and a safety coupling provided between the driving gear wheel and the rotary sleeve and formed so that the safety coupling separates if a limit torque is exceeded, the safety coupling being formed as an overlock coupling seated on the rotary sleeve and having two axially adjacent coupling parts that mesh in a form-locked manner by torque-transmitting transmission elements and are overlockable if the limit torque is exceeded counter to an axially acting elastic force, one of the coupling parts being a part associated with the driving gear wheel and rotatable relative to the rotary sleeve while the other of the coupling parts is coupled to the rotary sleeve in a way that transmits torque.