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

Abstract: Disclosed is a turning mechanism for a chair seat which comprises a shaft having a square cross section and fixed to the leg of a chair having a seat, a spring disposed to the shaft with an end thereof locked to the shaft and the other end thereof engaged so as to be associated with the turning of the seat of the chair, a stopper inserted into and engaged with the shaft through a square hole defined at the center thereof, a stopper receiver having abutting portions formed thereto and abutted against projections formed to the stopper, a first bush inserted into and engaged with the shaft through a square hole defined at the center thereof; and a second bush inserted into and engaged with the shaft through a square hole defined at the center thereof, wherein the first bush, the stopper and the second bush are contained in the stopper receiver. With this arrangement, there is provided a compact turning mechanism for a chair seat which is lingt in weight and small in size and can reduce an assemblying job.

Abstract: To assure that each spectator sitting on his seat enjoys a performance in a theater or the like at his desired height, a floor height adjusting mechanism is mounted on each of a plurality of movable platforms constituting a variable floor height telescopic multi-staged spectator seating system. Usually, the floor height adjusting mechanism is constructed in the form of a threaded shaft driving unit which is composed of a motor, a threaded shaft adapted to be rotationally driven by the motor, and a support column fixedly secured to each movable platform. The lowermost end of the support column is operatively connected to the lowermost end of the threaded shaft for rotatably holding the threaded shaft.

Abstract: An apparatus for setting an operative attitude to be assumed by each furniture such as a chair, a table or the like in a furniture accommodating chamber of a furniture raising/lowering type floor equipment is disclosed. The apparatus includes as essential components a raising/lowering unit vertically displaceably accommodated in the furniture accommodating chamber and having an array of furnitures mounted thereon so as to allow the furnitures to assume a raised-up attitude or an accommodated attitude, first and second cam guide rails arranged in the furniture accommodating chamber while standing upright therein so as to assure that the furnitures firmly maintain a raised-up attitude or an accommodated attitude, and a triangular link mechanism operatively associated with the raising/lowering unit and operatively connected to the furnitures so as to enable the furnitures to assume a raised-up attitude or an accommodated attitude.

Abstract: An apparatus for opening and closing covering means for a furniture raising/lowering type floor equipment employable for a building such as a hall, a theater, a gymnasium or the like wherein the covering means in the form of a rigid cover plate is accommodated in a cover plate accommodating gap with the aid of a link mechanism when a plurality of furniture accommodated in a furniture accommodating chamber in an inoperative state are to be raised up to stand upright above the floor surface of the building thereby to assume an operative state is disclosed. The link mechanism comprises an opposing pair of links each having cutouts formed at the opposite ends thereof and an opposing pair of slide links pivotally connected to one end of the cover plate. A flexible cover plate adapted to be laid across the furniture accommodating chamber may be substituted for the solid cover plate.

Abstract: An apparatus for opening and closing covering means for a furniture raising/lowering type floor equipment employable for a building such as a hall, a theater, a gymnasium or the like wherein the covering means in the form of a rigid cover plate is accommodated in a cover plate accommodating gap with the aid of a link mechanism when a plurality of furniture accommodated in a furniture accommodating chamber in an inoperative state are to be raised up to stand upright above the floor surface of the building thereby to assume an operative state is disclosed. The link mechanism comprises an opposing pair of links each having cutouts formed at the opposite ends thereof and an opposing pair of slide links pivotally connected to one end of the cover plate. A flexible cover plate adapted to be laid across the furniture accommodating chamber may be substituted for the solid cover plate.

Abstract: An apparatus for locking an operative position of each furniture such as a chair or the like on a furniture raising/lowering floor equipment wherein the furniture is mounted on a raising/lowering unit vertically displaceably arranged in the furniture accommodating chamber and the operative position of the furniture is reached when the raising/lowering unit is fully raised up and the furniture is then tilted is disclosed. The apparatus includes as essential components a triangular link plate turnably supported on a rotational shaft transversely projecting from the raising/-lowering unit, a support shaft for the furniture turnably arranged on the rotational shaft, an opposing pair of substantially inverted U-shaped turnable engagement pieces, and a pair of joint links bridged between the link plate and the engagement pieces. The raising/lowering unit is provided with engagement projections on the opposite sides at the upper end thereof and a stopper pin at the intermediate position at the lower end thereof.

Abstract: An apparatus for turning up and down seats for a telescopic seating system includes as essential components a foot on which a single seat is fixedly mounted, a base frame having a support shaft inserted therethrough in the transverse direction so as to allow the foot to be turned up and down about the support shaft, a center shaft extending through the base frame in parallel with the support shaft and including an extension outside of the housing, a guide arm turnably mounted on the extension of the center shaft, a pair of first coil springs mounted on the support shaft within the interior of the base frame so as to allow the foot to be normally biased in the turning-up direction, a second coil spring mounted on the extension of the center shaft so as to allow the guide arm to be normally turnably biased in the forward direction, and a pair of tongue-shaped projections fixedly mounted on the center shaft within the interior of the base frame, a link plate bridged between a front shaft on the foot and a rear s

Abstract: An unique apparatus for displacing an extensible/contractible board for a chair in case of an occurrence of emergency is disclosed. The apparatus includes a board support, an engagement piece, a turn guide plate, a stationary guide plate and an opposing pair of base members. The board assumes a horizontal attitude during normal use. In case of emergency, an excessive magnitude of outer force in excess of resilient force derived from Belleville springs is imparted to the board by an user's hand so that the engagement piece is disengaged from the turn guide plate via operative engagement of an eccentric projection on the board shaft with an engagement recess on the engagement piece. This causes the board to be displaced from the horizontal attitude to a vertical attitude, whereby a sufficiently wide space is provided in front of the user so as to enable him to quickly escape from his chair.

Abstract: An apparatus for turning up and down a spectator's seats includes a foot member which is turnably supported within a base frame fixedly mounted on the movable platform. A pair of Y-shaped lock links are supported turnable about a support shaft which extends throught the fore end thereof. The upper portions of the lock links rotatably support a locking and unlocking roller therebetween and this roller serves as a weight. On the other hand, the lower portions of the lock links are formed with a hook respectively. A locking angle is fixedly secured to both the side walls of the base frame at the position located behind foot member in such a manner that the hooks are engaged to the locking angle to firmly hold the foot member in the upright standing posture when the roller is lowered by turning movement. Engagement of the hooks to the locking angle can be released by abutment of the roller against the front nose on the upper movable platform during backward movement of the first-mentioned movable platform.

Abstract: A new apparatus for turning up and down spectators' seats for a telescopic seating system of the type including a plurality of movable platforms which are arranged in tiers is disclosed. The apparatus essentially comprises a frame fixedly mounted on a movable platform, a foot member fixedly secured to the housing of a seat, a stopper link turnably supported on the foot member, an unlocking member turnably supported on the frame and a leaf spring operatively connected to the rear end of the stopper link. The foot member is formed with projections at the rear end part thereof which are adapted to abut against a front nose of the adjacent upper movable platform as the first-mentioned movable platform is displaced forwardly to the extended position. The foot member assumes the upright standing position by turning up on the frame together with the housing of the seat.