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:
May. 30, 1978
Filed:
Dec. 15, 1976
Applicant:
Inventors:
Ken Takahashi, Tokyo, JA;
Hideo Inoue, Tokyo, JA;
Assignee:
Taiheiyo Engineering Inc., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ; F01B / ;
U.S. Cl.
CPC ...
61 4 / ; 91-1 ;
Abstract
System and equipment for operating self-advancing supports comprising electromagnetic valves being provided in each of the self-advancing supports which support the roof of a long-walled pit face in a coal mine and rendering operative the hydraulic cylinders for causing the roof plates of the supports to be lowered and lifted and for causing the supports to move toward the pit face, and operating devices being connected to the electromagnetic valves through a cable wherein the electromagnetic valves can be opened and closed through the operating devices from a desired position remote from the supports so as to operate the supports.