Abstract: A chair-raising and folding construction is simple in construction and reduced in weight, and is also capable of, when using a moving stand with lower stages of decks protracted, effectively preventing spectators, etc. from entering into non-used decks protracted. The moving stand telescopically accommodates and protracts a plurality stages of decks (1,2). Each of the decks (1,2) has a plurality of raisable and foldable chairs (3). A leg portion (5) of the chair (3) is hinge-connected to a base frame (4) disposed on the deck (1). A crank member (10), comprising a swing arm (12) protruding upward from the base frame (4), and a hook (13) protruding forward from a lower end portion of the swing arm (12), is rotatably supported at a corner portion thereof. The swing arm 12 has such a protruding length such that a distal end portion thereof abuts against a front end surface (2a) of the upper stage-side deck (2).

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