Patent ID: 8272155
Filing Date: 2012-09-25
Classification: G09F

Abstract:
1. An automatic banner roll-up mechanism, comprising a first tube, a second tube, a foldable material, a connecting rod, a plurality of ball bearings, a cylindrical spring, two plugs and a stopper, characterized in that: the foldable material is connected between the first tube and the second tube, one end of the first tube being covered by the plug having a positioning post, the other end of the first tube covered by the other plug in which the connecting rod, the cylindrical spring, the ball bearings and the stopper are disposed, one end of the connecting rod provided with a positioning post, a first retaining portion of the connecting portion including a notch, an inner edge of one of the plugs having a plurality of first troughs and second troughs; wherein when the plug rotates in one direction, the cylindrical spring is twisted tight and the ball bearings move into the second troughs to engage with the notch of the first retaining portion; and when the plug rotates in a reverse direction, the ball bearings move back into the first troughs, so that the cylindrical spring is released to cause the plug to rotate in the reverse direction to thereby roll up the foldable material into the first tube.