Importance

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Abstract

To provide a turning up and down apparatus for telescopic tiered spectator's seats capable of preventing the foot members of a chair from being turned down forward, a turning up and down apparatus for telescopic tiered spectator's seats of the present invention is arranged such that the foot members of each of the chairs are pivotally supported at the lower ends thereof so as to rotate about a spindle as a fulcrum, a drive shaft is disposed to which transmitted is the rotation of an output shaft which is rotated by a forward and rearward rotatable motor disposed on each of the platforms, the rotation of the output shaft being reduced through the combination of gear trains, and the front ends of boomerang-shaped links are coupled with the foot members by a foot member coupling pin and the rear ends thereof are supported by a rear end coupling pin, wherein when the foot members are in a turned up state, since the links are pressed against the drive shaft and the center of the rear end coupling pin is located at the position which is determined by getting over the straight line a small angle clockwise which is extended from the center of the foot member coupling pin through the center of the drive shaft, even if an external force for turning down the foot members forward is applied, the turning down thereof forward can be perfectly prevented.

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First Claim