GRILLE SHUTTER

PROBLEM TO BE SOLVED: To enable predetermined work such as the replacement of a shutter curtain at proper time before a core pipe ruptures, by making an abrasion state of the core pipe visually conspicuous. SOLUTION: In the shutter curtain 17 of the grille shutter, the upper-lower core pipes are connected via a link 6, and the link is arranged at a required interval in the width direction, and a decorative pipe 7 fitted around the core pipe is arranged between the links. A collar fitted to the core pipe and abutting on the links is arranged. An abrasion notifying ring is formed in the collar. When a contact plane of the core pipe and the link is abraded and the core pipe and link cause core dislocation, the abrasion notifying ring is exposed. COPYRIGHT: (C)2006,JPO&NCIPI