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. 07, 1977
Filed:
Feb. 26, 1976
Applicant:
Inventors:
Masao Hujimori, Tokyo, JA;
Shigeo Nakajima, Tokyo, JA;
Ken Takahashi, Tokyo, JA;
Tsunetoshi Ito, Yokohama, JA;
Toshio Shimada, Yokohama, JA;
Hajime Endo, Kushiro, JA;
Assignee:
Taiheiyo Engineering Incorporated, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 53 ; 299 71 ; 299 80 ; 299 87 ;
Abstract
A coal mining machine intended to be used in a pit having a long-walled pit face and having a mechanism in which two cutting drums are attached to the main ranging arm of a ranging drum shearer through a sub-ranging arm and the position of said cutting drums is defined by the cooperation of said main- and sub-ranging arms.