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:
Aug. 23, 1977
Filed:
Jul. 02, 1975
Hans Jutte, Dortmund-Brechten, DT;
Siegmund HF.L.M. Babendererde, Bad Vilbel, DT;
Adolf Foik, Munich, DT;
Reinhard E Bokemeyer, Offenbach, DT;
Gewerkschaft Eisenhutte Westfalia, Frankfurt, DT;
Hochtief AG, Frankfurt, DT;
Abstract
Apparatus for constructing an underground tunnel employs a drive shield composed of elongate drifting cutters disposed side-by-side in a circular configuration around a support frame. Hydraulic rams serve to advance the cutters and to shift up the frame when all the cutters have been advanced. The cutters have rear end portions which engage on a follow-up ring behind the drive shield. A platform is supported by the frame within the shield and carries some form of working appliance for detaching and removing the debris material. The platform also carries a rotatable concrete spraying device which serves to seal and secure the tunnel wall exposed when the follow-up ring is shifted up to the shield.