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:
Jan. 17, 1978
Filed:
Aug. 02, 1976
Dieter Stuckmann, Selm, DT;
Hans Jutte, Dortmund-Brechten, DT;
Siegmund Babendererde, Bad Vilbel, DT;
Reinhard Bokemeyer, Offenbach, DT;
Gewerkschaft Eisenhutte Westfalia, Lunen, DT;
Hochtief AG, Frankfurt, DT;
Abstract
Tunnel-driving apparatus utilizes a plurality of elongate drive or knife members arranged side-by-side and supported and guided for longitudinal movement on a frame. The members and the frame are advanced in succession during the driving process. Some or all of the drive members are hollow and accommodate telescopically extendible and retractible devices, conveniently of tubular form, used for treating the working face, for example, by conveying fluid to or from the face. The devices each have a series of cam-like projections engageable with spring-biased stops supported on the frame and the drive members. These stops serve to lock the devices in various positions and to automatically extend the devices from the members when the frame is shifted. The stops can be displaced however to generally engage the projections in such manner as to allow or prevent movement of the devices inwardly or outwardly of the drive members.