Patent · US Expired

Apparatus for static underground drilling

US6238141A · kind A · utility

4Cited by

8References

15Claims

0Family size

Assignee

Tracto-Technik Paul Schmidt Spezialmaschinen · DE

Inventors

Franz-Josef Puttmann · Lennestadt, DE
Andreas Riekes · Schmallenberg, DE
Frank Prutti · Lennestadt, DE
Bernhard Kaufmann · Schechingen, DE

Key dates

Filing date	Mar 30, 1999
Grant date	May 29, 2001
Priority date	—
Expiry date	Mar 30, 2019

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B44/06
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In an apparatus for drilling in earth, a push-pull linkage, especially a ladder-type linkage consisting of individual sections connected together in each case by a plug-in coupling, is connected to a push-pull drive, and a stationary locking pawl and a thrust pawl which is moveable in the longitudinal direction of the linkage and is connected to the drive, with two mutually opposite directions of action, can each be brought into active connection with the linkage in order to move the linkage forward stepwise and lock it temporarily after each movement step.

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