Patent · US Expired

Automatically driven pile driver drilling device

US5960892A · kind A · utility

5Cited by

9References

10Claims

0Family size

Assignee

Tracto-Technik Paul Schmidt Spezialmaschinen · DE

Inventors

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

Key dates

Filing date	Aug 23, 1996
Grant date	Oct 5, 1999
Priority date	—
Expiry date	Aug 23, 2016

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B4/145
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The invention relates to an automatically driven pile-driver drilling device for drilling into the earth with a percussion piston moving axially inside a casing, driven by a pressure medium and changeable from a forward stroke to a backstroke, with a working space having radial control openings, a guide pipe with radial control openings extending into the working space and forming a rigid part of the housing, and a control box guided into an annular chamber of the guide tube and axially adjustable in a spring-pneumatic manner.

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