CONNECTION STRUCTURE OF LONG ROD AND CONNECTION UNIT THEREFOR

Japanese Patent JP2018048539

A

PROBLEM TO BE SOLVED: To easily and quickly connect a short rod on site and lengthen a life of use of a rod with little deformation or breakage of a threaded portion due to an axial force in a long rod which can transmit a shaft force and a rotational torque by connecting a plurality of short rods.SOLUTION: A long rod is configured with: a short rod a in which a projection shaft a1 is vertically provided at a lower end and a female thread a2 is engraved in a recess at an upper end; an intermediate cylinder b in which a female thread is provided on an upper inner circumference, a step b2 is projected on an intermediate inner circumference, and a polygon part b3 is provided therebelow; a retainer c; an axial force transmission shaft in which a polygonal prism part d2 and a cylindrical base part are provided above a male thread d1 and a diameter-reduced part, a maximum diameter part and an expanded diameter part are provided thereabove; and retainer locking means. The axial force transmission shaft is screwed with the female thread of the lower short rod a. The projection shaft a1 of the upper short rod a is screwed with the female thread of the intermediate cylinder b. The intermediate cylinder b is inserted into the axial force torque transmission shaft of the lower rod and detachably connected.SELECTED DRAWING: Figure 1

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YAMATO YORITOMO

JP2017032392A

March 29, 2018

February 23, 2017

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GEO KIZAI KK

E02D1/02

Shoshiro Toshima

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