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:
Mar. 01, 1977
Filed:
Jan. 10, 1975
Applicant:
Inventors:
Richard J Robbins, Seattle, WA (US);
Hans A Adami, Vashon, WA (US);
Assignee:
The Robbins Company, Seattle, WA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
299 56 ; 173 36 ; 175 94 ; 175101 ; 175325 ;
Abstract
A boring assembly is advanced upwardly by thrust rams acting on a column guided traveling cross frame connected to the power tunneler from below by a non-rotating sectional support column. The support column is anchored to a holding table situated underground above the thrust ram while sections are being added to or removed from it. The boring assembly is driven by either a hydraulic motor housed in the cross frame, via a sectional drill stem housed within the support column, or by a hydraulic motor housed directly within the boring assembly.