US 6,640,914 B2 · Percussion borer for forming bores in stone material

Abstract

A percussion bores for forming borer in a stone material and including a chisel stem (2) having a prismatic cross-section and provided with a chiseling head (3) and at least one radial opening (4), a twist drill (6) extending through the cylindrical through-bore (3) of the chisel stem and projecting beyond the chiseling head (7), a drilling head (10) with cutting elements (9) provided at the projecting end of the twist drill and a shank (12) provided at another end of the twist drill, and a stop (13) provided between the shank (12) and the chisel stem (2), with a drill stem being offset radially inwardly with respect to an outer diameter of the shank in the region of the stop.

Claims15

Dependent claims

A percussion borer for forming bores in stone material (11), comprising a chisel stem (2) having a prismatic cross-section, an axial cylindrical through-bore (3), a chiseling head (7), and at least one radial opening (4);

a twist drill (6) extending through the cylindrical through-bore (3), projecting beyond the chiseling head (7), and having at an end thereof projecting beyond the chiseling head (7), a drilling head (10) with cutting elements (9) and, at an end thereof opposite the drilling head (10), a shank (12);
and a stop (13) provided between the shank (12) and the chisel stem (2), with a drill stem being offset radially inwardly with respect to an outer diameter of the shank (12), whereby an impact shoulder impacting the stop (13) is formed.

Dependencies are inferred from the claim text.

Facts

Application

10/120,658Filed 11 Apr 2002

Priority

DE 101 19 56221 Apr 2001

Published

US 2002/0153173 A124 Oct 2002

Granted

4 Nov 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

B28D 1/146
By boring or drilling: tools therefor
B23B 51/0045
Drills for enlarging a hole: by expanding or tilting the toolhead
E21B 10/445
Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts: percussion type, e.g. for masonry
E21D 21/0053
Characterised by constructional features of the bolts: anchoring-bolts in the form of lost drilling rods

Percussion borer for forming bores in stone material

Life of this patent

Percussion borer for forming bores in stone material

Life of this patent

Abstract

Claims15