Hand-held electrical combination hammer drill

US6550545B1 · kind B1 · 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: Aug 9, 2000
• Grant date: Apr 22, 2003
• Expiry date: Dec 12, 2020

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.