Patent · US Expired

Reversible percussion piston drill apparatus

US5954145A · kind A · utility

8Cited by

4References

10Claims

0Family size

Assignee

Tracto-Technik Paul Schmidt Spezialmaschinen · DE

Inventors

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

Key dates

Filing date	Apr 29, 1997
Grant date	Sep 21, 1999
Priority date	—
Expiry date	Apr 29, 2017

Classification

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

Abstract

In a percussion drill apparatus for soil drilling with a percussion piston which is moving to and fro within a housing, a control sleeve is mounted on a control tube which protrudes into the percussion piston chamber, the axial position of which determines the direction of movement of the apparatus. In order to make a reversal of movement possible a reversing chamber is connected with a control air line which runs inside the control tube and an approach chamber is connected by way of a drilling with the interior of a control tube which feeds the operating air into the percussion piston chamber. Consequently the control sleeve is moved into one direction with the aid of the control air and in the other direction with the aid of the operating air.

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