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. 03, 1977
Filed:
Dec. 22, 1975
Applicant:
Inventor:
Hiroshi Takada, Yokohama, JA;
Assignee:
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
61 727 ; 61 42 ; 175 62 ; 254 / ;
Abstract
There is disclosed a method of laying small-diameter pipes such as gas, water pipes or the like precisely in position in the ground. Small-diameter pilot pipes are first laid in with a pilot head being measured and controlled in order to make its advance straight. Pipes which are larger in diameter than the pilot pipes are then laid in successively, the large-diameter pipes being led by the pilot pipes. A multistage head is used as a head utilized for consolidation of soil and disposed in a following relationship to the pilot pipes, thereby reducing resistance exerted upon the head.