MEASURING METHOD OF LENGTH OF CONDUIT - SUMITOMO ELECTRIC INDUSTRIES

Title:

MEASURING METHOD OF LENGTH OF CONDUIT

Document Type and Number:

Japanese Patent JPH06221801

Kind Code:

A

Abstract:

PURPOSE: To obtain a method for measuring the length of a buried conduit quickly beforehand on the occasion when a cable is laid in the conduit.

CONSTITUTION: A method for measuring the length of a conduit by sending air into the conduit 3 and inserting a filament body 1 therethrough by an air flow. The filament body 1 is formed of a light and flexible wire 1-2 and lightweight and elastic members 1-1 of large diameters fitted to the fore end of the wire and intermediate parts thereof. The diameters of the members 1-1 of large diameters are made larger toward the fore end, or intervals of the members 1-1 of large diameters being adjacent mutually are made narrower toward the fore end, and the filament body thus formed is inserted through quickly to a manhole 4 of an exit.

Inventors:

TAGUCHI KINJI
SANO HIROAKI
TANAKA SHIGERU
TSUJIMURA TAKESHI

Application Number:

JP6234893A

Publication Date:

August 12, 1994

Filing Date:

March 23, 1993

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES
NIPPON TELEGRAPH & TELEPHONE

International Classes:

G01B3/00; H02G1/06; H02G1/08; (IPC1-7): G01B3/00; H02G1/08

Attorney, Agent or Firm:

Tetsuji Ueshiro (2 outside)

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