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. 31, 1977
Filed:
Dec. 22, 1975
Applicant:
Inventors:
Hiroshi Takada, Yokohama, JA;
Yasuo Kawada, Isehara, JA;
Assignee:
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 45 ; 175 19 ; 175 62 ; 175 61 ; 175 73 ;
Abstract
There is disclosed a pilot head used for laying small-diameter pipes such as gas, water conduits or the like precisely in position in the ground. The pilot head comprises an expandable and contractable pilot jack disposed within a pilot casing, a pivoting cylinder adapted for pivoting said pilot jack in any selected direction in a plane normal to the central axis of the pilot head, and an electromagnetic valve for operating said cylinder. The pilot head further includes a target and a clinometer both for detecting the position and posture thereof.