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. 20, 1977
Filed:
May. 10, 1976
Dieter Stuckmann, Selm, DT;
Siegmund Babendererde, Bad Vilbel, DT;
Hans Jutte, Dortmund-Brechten, DT;
Reinhard Bokemeyer, Offenbach, DT;
Gewerkschaft Eisenhutte Westfalia, Wethmar near Lunen, DT;
Hochtief A.G., Frankfurt, DT;
Abstract
Tunnel driving apparatus has a shield with a plurality of cutter planks arranged side-by-side around the tunnel axis. The planks are supported and guided by two frames connected via a rigid bracing structure. One of the frames is provided with adjustable means capable of expanding or contacting the frame radially of the tunnel axis. The planks are advanced in known manner individually or in groups and the adjustable frame can be used to make the axes of the planks converge rearwardly of the tunnel driving direction when desired. Such control permits steering of the apparatus by making the reactive forces on the advancing planks cant the shield within a tapered gap between the planks and the tunnel wall. In addition the tendency of the frames to become jammed in the planks when being shifted up can be precluded.