Drill for forming undercuts in bores

US6505692B1 · kind B1 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Werner Kaibach · Buchloe, DE
• Stefan Raber · Kaufering, DE

Key dates

• Filing date: Jul 13, 2000
• Grant date: Jan 14, 2003
• Expiry date: Jul 13, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/8595
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A drill for forming undercuts in cylindrical bores formed in stone or concrete and including a drilling member (2;22) having a stem (3;23) provided, at its opposite longitudinal ends, respectively, with a shank (4;24) receivable in a chuck of a hand-held drilling tool and a cutting head (5;25) with abrasive cutting bodies, and a sleeve (7;27) for receiving the drilling member (2;22) and having, at its end adjacent to the shank (4;24), a radial collar (8;28), a drag bearing (11) arranged in side the sleeve for supporting the drilling member (2;22), and at least one opening (15;35, 36, 37) formed in a front, in a direction toward the cutting head (5;25), section of the sleeve and spaced axially from the drag bearing (11) by a distance (a) amounting to from about 0.05×D to about 0.6×D, where D is an outer diameter of the sleeve in the drag bearing region of the sleeve.