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. 21, 1984
Filed:
Aug. 28, 1981
Applicant:
Inventors:
Dieter Stuckmann, Selm, DE;
Herbert Heitkamp, Werne, DE;
Assignee:
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
405143 ; 299 31 ;
Abstract
Apparatus for use in driving tunnels or the like comprises a front drive shield composed, for example, of elongate cutter knives supported for longitudinal displacement on a frame. In order to control turning motion of the shield the shield is connected via hydraulic control rams to a rear abutment such as a follow-up ring structure. The rams are all inclined relative to the longitudinal axis of the apparatus. The rams are divided into two groups inclined in opposite directions and the rams of each group can be subjected collectively to pressure fluid to impart a corrective torque to the frame.