Patent · US Active

Drilling tool and drilling method

US8146681B2 · kind B2 · utility

6Cited by

3References

10Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Kay Heemann · Kaufering, DE
Uwe Bohn · Kissing, DE
Wolfgang Ludwig · Destin, US

Key dates

Filing date	Oct 14, 2009
Grant date	Apr 3, 2012
Priority date	—
Expiry date	Jun 26, 2030

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B44/02
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drilling tool includes a hydraulically driven device (21) for advancing a drilling head (2) in a bore (5), and a flow limiter (30) arranged in a hydraulic conduit (25) of the advancing device (21) for adjusting an advancing speed of the drilling head (2) in the bore (5), with the flow limiter (30) having a pressure-actuated adjusting member (38) for adjusting flow of a hydraulic fluid in the hydraulic conduit means (25) in accordance with a flow volume of a rinsing fluid (7) for rinsing the bore.

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