Hammer drill

US4732217A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Manfred Bleicher
• Ulrich Bohne · Dessau, DE
• Karl Wanner · Echterdingen, DE

Key dates

• Filing date: Jan 17, 1986
• Grant date: Mar 22, 1988
• Expiry date: Jan 17, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D2211/067
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A power driven hammer drill includes a percussive mechanism connectable to driving gears via a clutch. A pressure amplifying lever system is arranged between a movable part of the clutch and shiftable guiding means for a work tool to apply an amplified pressure on the clutch when the work tool is pressed against a workpiece.