Patent · US Expired

Ram boring machine

US5095998A · kind A · utility

7Cited by

2References

2Claims

0Family size

Assignee

Paul Schmidt · DE

Inventors

Alfons Hesse · Lennestadt, DE
Herbert Hupertz · Utting am Ammersee, DE

Key dates

Filing date	Jul 6, 1990
Grant date	Mar 17, 1992
Priority date	—
Expiry date	Jul 6, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T279/17042
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In a ram boring machine that has a striking piston displaceable in a tubular housing, a displaceably mounted chisel passing through a housing tip has a collar by which it is guided in a bore in the housing that has a front and a rear stop limiting the stroke of the chisel, and has a shank that projects into the working chamber of the striking piston, rebounding blows are avoided by making the length of projection of the shank is smaller than the maximum stroke of the collar between the stops.

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