PURPOSE: To perform a stable opening or closing of a suction grille by a method wherein a resin washer is assembled between a four-element link fixing element and a shaft stopper ring.
CONSTITUTION: One fixing element 4a of a four-element link 9 for use in opening or closing a suction grille 1 is fixed to the suction grille 1 and the other fixing element 4b is fixed to a front frame 3. Each of links 2a and 2b is connected to the fixing elements 4a and 4b, respectively. The fixing element 4b is provided with a crescent-shaped hole 7 at a circumferential position of a fulcrum point 6 with the link 2b. A shaft 5 is passed through the hole 7 and the fixing element 4b is held and fixed with the link 2b and a fixing ring 8. A resin washer 10 is assembled between the fixing element 4b and the stopper ring 8 so as to prevent the fixing element 4b from being contacted with the stopper ring 8. With such an arrangement as above, no contact with the fixing element caused by contact with the stopper ring 8 occurs when the suction grille 1 is opened or closed, resulting in that a stable opening or closing of the suction grille 1 can be attained.
KANEKO HIROMASA
MITSUYANAGI YUKITAKA
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