PURPOSE: To smoothly develop a folding base, by constituting a push-out device with a swing part installed at a specified position of the rear base side, a gas spring, a front roller and an intermediate roller equipped at the swing member. ;CONSTITUTION: When a stage 1 is unfolded from a folded state, if the wire W wound up is gradually wound off, the central frame 11 is pushed out to the developing direction by an intermediate roller 91 of the push-out device 81 by the actuation of a gas spring 87 and the front base 3 and the rear base 5 are unfloded. When the frame 11 is pushed by the distance L2 by the roller 91, the front end roller 89 of the second arm 97 gets into contact with the frame 11 and it is pushed to the develop direction M to accelerate the development. When the frame 11 is pressed by the length L1, the rod 105 of the spring 87 is fully elongated and the swinging motion of the swing member 85 is stopped. Thereafter, the stage is unflolded further by the own weight of stage and finally the stage 1 gets to the horizontal state.;COPYRIGHT: (C)1995,JPO
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