| 摘要 |
PROBLEM TO BE SOLVED: To downsize a casing and reduce difference of force of tensile coil spring between closed and opened conditions of a door. SOLUTION: This mechanism comprises a casing 2 having a spring support part 4h and an opening 4c, a door body 5 having a spring hooking part 5c and a turning shaft part 5b as well as opening/closing an opening of the casing 2 when it turns, a control part 4d to control the door body to a closed position to close the opening, and a tension coil spring 6 to be bent and stretched after it comes into contact with the outer circumferential surface of the turning shaft part when it is turned to an opening position to open the door body.
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