EXPANDED RING FOR MANHOLE TUBE COUPLING

Japanese Patent JP3821599

B2

PROBLEM TO BE SOLVED: To facilitate installing operation by arranging plural guide projections having a guide surface projecting outward in a radial shape by dividing the circumferential length of an annular hoop body into almost two parts or three parts in an expanded ring for a manhole tube coupling.
SOLUTION: Plural guide projections 61 projected outward in a radial shape by dividing the circumferential length of an annular hoop body 31 into almost two parts or three parts are arranged in an installing ring 60 for a tube coupling. The guide projections 61 are provided with a guide surface for positioning/ guiding the tube coupling to an installing hole by abutting to an inner peripheral wall surface of a manhole. After inserting/installing an expanded ring in a diameter of an installing ring 6 for the tube coupling, a nut part 49 is rotated by a spanner or the like, and leg parts 42, 43 are swingingly expanded. Locking claws 50, 51 are fitted in respective recesses of locking claw receiving parts 35, 36, an outer peripheral surface of the annular hoop part 31 abuts to the almost whole peripheral area of an inner peripheral surface of the installing ring 6 for the tube coupling, and expandes up to a prescribed diameter. Thus, the tube coupling can be positioned in a prescribed position to a diameter of the installing hole.

WO/1995/016165	METHOD AND APPARATUS FOR INFLATING AND CURING A RESIN IMPREGNATED MANHOLE LINER
JP3019954	[Name of device] Handrail for manhole

Kunori Kuninaga

JP7047999A

September 13, 2006

March 16, 1999

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Nishikawa Rubber Industry Co., Ltd.

E02D29/12; (IPC1-7): E02D29/12

JP10195900A
JP10195901A
JP9165769A
JP9250658A

Shohei Oguri
Toshimitsu Ichikawa
Takeshi Takamatsu
Hagino Taira
Kiyotaka Sasaki
Toshio Fukasawa
Zenichi Soeda
Hironori Honda

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