Ram boring machine

US5042599A · kind A · utility

Assignee

• Paul Schmidt · DE

Inventors

• Paul Wayne Schmidt · Lennestadt, DE
• Alfons Hesse · Lennestadt, DE
• Gerhard Balve · Lennestadt, DE
• Franz-Josef Puttmann · Lennestadt, DE

Key dates

• Filing date: Feb 1, 1990
• Grant date: Aug 27, 1991
• Expiry date: Feb 1, 2010

Classification

• Technology area (CPC —): General

Abstract

A ram boring machine having a striking piston that is axially displaceable in a housing, of which the forward and backward movement is controlled by a control sleeve connected to a supply hose and which engages in a cylinder chamber of the striking piston, and by one or more corresponding control openings in the striking piston, wherein the control sleeve is loaded both axially and torsionally, has axial and rotational stops and is rotatable and axially displaceable in a guide sleeve arranged at the rear end of the housing.