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:
Feb. 14, 1978
Filed:
Oct. 19, 1976
Dieter Stuckmann, Selm, DT;
Hans Jutte, Dortmund-Brechten, DT;
Gewerkschaft Eisenhutte Westfalia, Lunen, DT;
Abstract
A drive shield for use in a tunnel driving operation has an inner frame with hollow rings interconnected in a rigid fashion. A plurality of sharp-ended drive members combine to form a cylindrical shell contacting the tunnel wall. Rams serve to advance the drive members in the advancing direction either individually or in groups and to draw up the inner frame. Support devices of circuate shape form a second shell inside the drive members and support and guide the latter. Piston and cylinder units are interposed between the rings and the support devices and serve to displace the latter radially so that selected members can be forced against the tunnel wall with a greater or lesser pressure.