Drill hammer with three modes of operation

US8281872B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Achim Duesselberg · Kirchheim unter Teck, DE
• Andre Ullrich · Echterdingen, DE
• Helmut Heinzelmann · Stuttgart, DE
• Thomas Bernhardt · Neckartenzlingen, DE
• Michael Weiss · Dittelbrunn, DE
• Tobias Herr · Stuttgart, DE

Key dates

• Filing date: Sep 25, 2006
• Grant date: Oct 9, 2012
• Expiry date: Aug 22, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D2250/371
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A drill hammer for the three operation modes of drilling, chiseling, and hammer-drilling has a motor with a motor shaft; a gear with an intermediate shaft, a driving gear wheel, a toothed slaving shaft , a shifting hub, and a driven gear wheel; a percussion mechanism with a wobble disk and a wobble gear wheel; and a driven shaft with a driving gear wheel and a drill chuck. The gear is configured to be changed over easily without axial displacement of running gears that mesh with one another so that the drill hammer is more robust, shorter or more compact, and lighter in weight. The drill hammer is thus simply and economically constructed and whose efficiency is not impaired by the gear shifting mechanism.