Patent · US Expired

Rammer

US4871034A · kind A · utility

11Cited by

2References

2Claims

0Family size

Inventor

Paul Wayne Schmidt · Lennestadt, DE

Key dates

Filing date	Feb 26, 1988
Grant date	Oct 3, 1989
Priority date	—
Expiry date	Feb 26, 2008

Classification

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

Abstract

In a rammer for driving in pipes open in the direction of ramming, in which a piston, axially reciprocated in a housing having an impact head, imparts its thrust to the housing, making the impact head integral with the housing allows a shorter rammer to be used without loss of thrust.

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