Patent · US Active

Pneumatically reversible ram boring device

US7874382B2 · kind B2 · utility

6Cited by

5References

14Claims

0Family size

Assignee

TRACTO-TECHNIK GmbH & Co., KG · DE

Inventors

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

Key dates

Filing date	Apr 10, 2006
Grant date	Jan 25, 2011
Priority date	—
Expiry date	Nov 28, 2026

Classification

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

Abstract

A pneumatically reversible ram boring device includes a percussion piston (8) that is situated in a casing (1) and is movable back and forth by operation air supplied via an operational-air supply via an operational-air line (5), a control pipe (4, 36, 54) having at least one control opening (13), an outer pipe (15, 65), and a control sleeve (10, 60) that can be displaced by compressed air from a control chamber (16, 66). An essentially torsion-resistant operational-air line (5) can be rotatably connected to a rotary valve (4, 40, 70) that supplies the control chamber with operational air or vents air from the chamber.

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