Screwdriver handgrip having harder and softer zones

US4739536A · kind A · utility

Assignee

• Wera-Werk Hermann Werner GmbH & Co. KG · DE

Inventors

• Jan-Eric Bandera · Stuttgart, DE
• Peter Kern · Salem, DE
• Roland Schindhelm · Stuttgart, DE
• Johannes Solf · Sindelfingen, DE
• Karl Lieser · Wuppertal, DE

Key dates

• Filing date: Jul 7, 1986
• Grant date: Apr 26, 1988
• Expiry date: Jul 7, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S16/902
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A handle for tools, specifically for screwdrivers, is disclosed. The handle consists of two materials of different hardness, of which the harder material supporting the tool is incompressible under the forces occurring at operational load, whereas the other material permits slight elastic deformations under forces of load. In order to obtain a hand-sympathetic design which nevertheless transmits high torques, the two gripping zones of softer material are situated adjacent to a gripping zone of harder material located between them.