| 摘要 |
PROBLEM TO BE SOLVED: To improve the assembly of an opening and closing door device which is used for various electronic equipment, and to smoothly open and close a door. SOLUTION: In order to improve the assembly of an opening and closing door, a door 1, a rotary shaft 1a, and a spring hook part 1b are molded in a single body. At this time, deviations and burrs are formed on the rotary shaft 1a at its metal mold matching part due to metal mold constitution, so that D-cut surfaces composed generally of surfaces perpendicular to the metal mold matching surface are provided on both sides of the center of rotation between the center of rotation and outer periphery. For this purpose, the tip shape of a projection part 5a of a shaft pressure member 5 clamping the rotary shaft 1a with a U-shaped bearing part 4 is made semicircular and is always brought into spot contact with the rotary shaft 1a so as to obtain smooth rotary motion which is free of catching.
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