| 摘要 |
PURPOSE:To prevent breakdown of a door even if the door is opened with a force, by providing a protrusion, rotated in the vicinity of a rotary shaft during rotation of a door, a spring body, having a projecting part with which the protrusion makes contact, and a stopper with which the protrusion makes contact during full opening of the door and which limits the full opening position. CONSTITUTION:When a door 3 is opened with a force, a protrusion 10 is brought into contact with a projecting part 16 of a first spring body 15 when the door is brought into a state close to full opening, and thereafter, the protrusion is moved over the projecting part 16. In this case, the force of the door is slightly reduced, but it is still powerful. Thereafter, the door 3 is further opened, and when it is brought into a state right before full opening, the protrusion 10 is brought into a second spring body 17, the force thereof is remarkably weakened. Thereafter, when the door 3 is fully opened, the protrusion 10 is forced into contact with 1 stopper 18, but in this case, since the force of the door 3 is considerably weakened. Thereafter, the door 3 is fully opened, the protrusion 10 is brought into the stopper 18, but since the force of the door 3 is considerably weakened, a not so high force is exerted on the stopper 18 with which the protrusion makes contact. Thereby, since a high power as in a conventional type is prevented from being exerted, breakdown is prevented from occurring.
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