Hand-held electrical combination hammer drill

US7044234B2 · kind B2 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Erwin Manschitz · Germering, DE
• Helmut Burger · Waiblingen, DE
• Josef Anzinger · Munich, DE
• Manfred Ege · Huglfing, DE
• Mathias Doberenz · Untermeitingen, DE

Key dates

• Filing date: Feb 24, 2003
• Grant date: May 16, 2006
• Expiry date: Apr 6, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25D2250/261
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A hand-held electrical combination hammer drill capable of being used both as a drilling hammer and as a chisel hammer, and including an actuation member (17) for actuating an electrical on-off switch of the hammer drill and located on the tool handle switching elements (3, 4) for switching between drilling and chiseling operations, stop elements (5–22) actuated by the switching means (3, 4) for retaining the actuation member (17) in a on-position of the on-off switch upon selection of the chiseling operation, and a stop switch (15) having, upon selection of the chiseling operation, a first position in which the stop switch provides for securing the actuation member (17) in its on-position with the stop elements (5–22), and a second position in which the stop elements occupies a non-operative position in which the actuation member, upon being released, automatically moves into its off-position under an action of a biasing force.