Patent · US Expired

Boring tool

US6116361A · kind A · utility

9Cited by

6References

6Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Werner Kleine · Achim, DE
Udo Hauptmann · Landsberg am Lech, DE
Harald Geiger · Schwanau, DE
Anton Knoller · Landsberg, DE
Josef Starkmann · Hurlach, DE

Key dates

Filing date	Feb 18, 1999
Grant date	Sep 12, 2000
Priority date	—
Expiry date	Feb 18, 2019

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/58
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drill including a shank (1) for connecting the drill with a drive tool, a stem (2) adjoining the shank (1) and having at most two helical discharge grooves (6, 7) opening toward a stem circumference, a head (3) provided at an end of the stem (2) remote from the shank (1) and having a diameter substantially corresponding to the stem diameter, with the head (3) having three radially extending recesses (8) provided in its free end surface and opening toward a head circumference, with the recesses being provided with at least one hard metal bit (9) provided with cutting portions (9a) extending from a central portion (9b) to the head circumference, and with the head (3), having three grooves (10, 11, 12) arranged between the three recesses (8), opening toward the head circumference, and connected with the discharge grooves.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.