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:
Jun. 29, 1976
Filed:
Apr. 11, 1975
Applicant:
Inventor:
Tyman H Fikse, Enumclaw, WA (US);
Assignee:
The Robbins Company, Seattle, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
299 33 ; 61 85 ; 214133 ;
Abstract
A cutting tool is mounted on the head of a support tripod, the legs of which are double-acting hydraulic cylinders. The rear ends of said cylinders are either pivotally connected to a frame portion of a tunneling machine or to movable barrel portions of three base cylinders having fixed rod portions. The cylinders are selectively extended and retracted for the purpose of moving the cutting tool forwardly and rearwardly and also up and down and sideways.