Tool bit chucking shank

US5421682A · kind A · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Josef Obermeier · Peiting, DE
• Michael Selb · Feldkirch, AT

Key dates

• Filing date: Mar 22, 1994
• Grant date: Jun 6, 1995
• Expiry date: Mar 22, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/95
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A tool bit, to be inserted into a tool bit chuck of a hand-held tool used for at least one of chiseling, drilling and percussion drilling, has an axially extending chucking shank (10) with a polygon-like cross-section having chamfered corners (13, 14, 15, 16). The chucking shank has two profiled faces disposed diametrically opposite one another and each has a locking groove (19) closed at its axially spaced ends. Two other diametrically opposite profiled faces form entrainment faces (12) with rotary entrainment grooves (11) each having entrainment faces (17, 18) for transmitting torque to the tool bit.