To provide a diameter enlarging apparatus for a cable conduit capable of cutting/forming a hole part at a normal position with the axis of the cable conduit as the center.
There are provided a shaft 1 which is inserted into a cable conduit K, a disc-like cutter 3 which is attached to the tip of the shaft 1 and enlarges the cable conduit K by cutting from the side of an inner peripheral surface 45, and a near barrel-like spring guide body 6 which is free to contract/ expand in diameter and is disposed closer to a base end side than to the cutter 3 while capped over the shaft 1. The spring guide body 6 which has an outer diameter larger than the inside diameter of the inner peripheral surface 45 of the cable conduit K in free state guides the cutter 3 along the axis of the cable conduit K by constantly and resiliently energizing the inner peripheral surface 45 of the cable conduit K.
| JP2007255657 | PIPE FOR SHEATHED PIPE CONSTRUCTION METHOD |
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| JP2016070598 | UNDERGROUND PIPE |
MIYAHARA MANABU
HAMANO TOMOJI
HANSHIN KENSETSU CO LTD
| JP2001314010A | 2001-11-09 | |||
| JPS63300958A | 1988-12-08 |
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