The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 1996
Filed:
Sep. 17, 1993
Applicant:
Inventor:
Alfons Hesse, Lennestadt, DE;
Assignee:
Tracto-Technik Paul Schmidt Speczialmashinen KG, Lennestadt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173 91 ; 1731621 ; 173211 ;
Abstract
A percussion boring machine having an impact piston axially movable in a housing, a control pipe connected to a compressed air hose and an elastic separator fitted between the housing and the control pipe and held under axial compression, whereby assembly of the separator is simplified. In addition the housing, control pipe and compressed air hose suffer less damage, and the control pipe can be assembled and disassembled more easily.