Patent · US Expired

Boring apparatus with coupling for rapid connection of drill string segments

US6267187A · kind A · utility

4Cited by

10References

18Claims

0Family size

Assignee

Tracto-Technik Paul Schmidt Spezialmaschinen · DE

Inventors

Franz-Josef Puttmann · Lennestadt, DE
Gerhard Balve · Lennestadt, DE

Key dates

Filing date	Jun 16, 1998
Grant date	Jul 31, 2001
Priority date	—
Expiry date	Jun 16, 2018

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B19/086
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In apparatus for producing and expanding earth boreholes and for destroying and replacing underground pipelines or for driving in pipes, a feed drive and a rotary drive having a plug-in coupling comprising a chuck and a locking portion at the end of a string is located in a frame. The string comprises a plurality of sections or lengths having an internal screw thread at one end and an external screw thread on the locking portion at the other end, which at the same time is provided with a key face to hold fast said string section while it is screwed together with the next following string section.

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