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. 24, 1977
Filed:
Dec. 22, 1975
Applicant:
Inventors:
Hiroshi Takada, Yokohama, JA;
Kenzo Hoashi, Yokohama, JA;
Assignee:
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
61 727 ; 175 62 ; 254 / ;
Abstract
There is disclosed a method and apparatus for laying small-diameter gas, water pipes or the like precisely in the ground. Small-diameter pilot pipes are first laid in while at the same time, a pilot head is measured and controlled to make its straight advance. Pipes of a larger diameter are then laid in successively, the pipes being led by the pilot pipes. Concurrent with this, excavated earth is discharged through the laid-in pilot pipes.