| 摘要 |
PURPOSE: A supporting structure of an automatic foldable type is provided to automatically fold and unfold the supporting structure. CONSTITUTION: A first member(10) contains an opened lower end. A second member(20) is inserted to the first member for operating corresponding to the first member. In case of lifting the first member, the second member is protruded toward a lower end of the first member by self-weight of the second member. A third member(30) is rotated for first and second member centering upon a rotating shaft(32) at the second member. A first groove(11) is formed on the first member in lengthwise direction for operating the second member. A rack-gear apparatus fixes the third member in a triangular shape. Herein, in case of a lower end of the second member inserted to the first member while being pushed by ground, the third member is rotated from the first member for a specific supporting angle. Moreover, the rack-gear apparatus is formed by a rack(12) in the first member; a gear for being engaged with the rack for rotating the third member; a second groove(22) on the second member for rotating the gear; a shaft install unit near the second groove for stopping the second member; and a third groove(23) on the second member for the second member to operate according to the rack on the first member. |
