| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic swing door capable of being automatically returned to the place of full closing or full opening only by applying a slight manpower to a door body at the place of the full opening or full closing and having a simple structure. SOLUTION: The automatic swing door has upper-lower support arms projected from the upper and lower sections of a rotary support juxtaposed to either of left-right vertical frames and a guide pin protruded at the upper end of a door body 3 capable of being moved along a guide rail linearly laid on an upper frame. The automatic swing door has an upper cam 9a having an external cam being fitted into the upper support arm 4 and having an inclined plane from a top section to a bottom section, and internal cam, which is inscribed and fixed to the external cam and in which phase is displaced at 180 deg., and a deformed intermediate-removing section bored at a central section, a lower cam 9b having an external cam and an internal cam having development line elevations having the same shapes as the external cam and the internal cam of the upper cam 9a and a circular intermediate-removing section bored at a central section, and a shaft section 8 having a sectional shape, which is projected from the upper end face of a door body 2 and in which an upper section can be fitted to the deformed intermediate-removing section and a lower section to the circular intermediate removing section respectively.
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