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:
May. 05, 1981
Filed:
Sep. 11, 1978
Applicant:
Inventors:
Dieter Stuckmann, Selm, DE;
Hans Jutte, Dortmund-Brechten, DE;
Assignee:
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E01G / ;
U.S. Cl.
CPC ...
405145 ; 405141 ;
Abstract
A tunnel drive shield comprises a cylindrical shell supported by two axially-spaced frames. The two frames are movable, relative to one another, in the direction of tunnel advance. In order to guide the two frames accurately, guide means interconnect the two frames, the guide means permitting movement only in the direction of tunnel advance. The guide means may be constituted by a plurality of telescopic guide devices. A knife shield may constitute the drive shield.