Percussion mechanism for a repetitively hammering hand power tool

US7677327B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Meixner · Echterdingen, DE
• Juergen Lennartz · Esslingen am Neckar, DE

Key dates

• Filing date: Feb 17, 2009
• Grant date: Mar 16, 2010
• Expiry date: Feb 17, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D2250/351
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A percussion mechanism for a repetitively hammering hand power tool in the form of a rotary hammer has a striker movable axially forward and backward in a guide barrel and imparting impacts directly and without any intermediate parts to an end section of a tool bit that is insertable into the hand power tool, a device that exerts pressure on the striker, by which the striker is capable of being set into a forward motion in the direction of the tool bit, a blocking element, with which the striker is blockable in its forward motion, and the striking frequency of the striker is adjustable by controlling the blocking time of the blocking element, so that the striking frequency of the striker depends on how long the blocking element blocks the forward motion of the striker.