Patent ID: 6061970
Filing Date: 2000-05-16
Classification: E04H

Abstract:
An electrically-operated multiple folding stage system comprising:first and second stage systems connected in series in a front/back direction, each of said first and second stage systems having a front stage component and a rear stage component connected with one another in a manner to be freely folded or unfolded in such a way that a connection point between the front and rear stage components moves in a vertical direction;a first link bar provided at the rear stage component of the first stage system;a second link bar provided at the front stage component of the second stage system;a stay integrally formed with a rear end of the first link bar in a direction inclined relative to a direction of the first link bar; anda link member pivotally connected to a front end of the second link bar at one end thereof and connected to the stay at another end thereof;wherein the stay and the link member are pivotally connected with one another and forming an angle of connection which is substantially smaller than 180 degree when the first and second stage systems are unfolded and laying flat on a floor; andwherein the angle of connection is increased when either the first stage system or second stage system starts folding by rotation of the stay and the link member, thereby increasing a distance between the first stage system and the second stage system.