Patent · US Expired

Drilling device with an impact-rotation tool

US5076374A · kind A · utility

0Cited by

3References

5Claims

0Family size

Assignee

fischerwerke Artur Fischer GmbH & Co. KG · DE

Inventors

Manfred Haage · Dornstetten, DE
Werner Heinzelmann · Alpirsbach, DE

Key dates

Filing date	Oct 26, 1990
Grant date	Dec 31, 1991
Priority date	—
Expiry date	Oct 26, 2010

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/36
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The drilling device for memory, particularly aerated concrete, includes an impact drilling machine and an impact rotation tool to be clamped in the drilling machine. To prevent the impact-drilling shank jamming in the drill hole as it is withdrawn, and nevertheless to achieve maximum holding power in the masonry, the impact-rotation tool consists of an impact-drilling shank tapered conically toward a tip from a cylindrical middle portion of increased diameter, a carrier bush connected with a circumferential shoulder of the impact-drilling shank and a ram engaging with some play in an internal bore of the carrier bush. A drill bit-like locating means is provided on the ram for engagement in the drilling machine.

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