Abstract: The automatic umbrella has an improved tube unit which contains a first tube, a second tube, and a third tube telescoping together. An inner plug is positioned inside the second tube. A reinforcing tube is housed in the second tube and capable of moving upward through the inner plug. The main spring has its top end against the reinforcing tube, and its bottom end in a lower part of the first tube. The secondary spring is inside the third tube with a top end against the inner plug of the top nest and a bottom end against the inner plug of the second tube. The tube unit enjoys enhanced resilience when the automatic umbrella is opened. When the umbrella is closed, two sets of springs are compressed at separate instants and their resilience cancels each other indirectly. The strength to close the umbrella is therefore reduced.

Abstract: The automatic umbrella has an improved tube unit which contains a first tube, a second tube, and a third tube telescoping together. An inner plug is positioned inside the second tube. A reinforcing tube is housed in the second tube and capable of moving upward through the inner plug. The main spring has its top end against the reinforcing tube, and its bottom end in a lower part of the first tube. The secondary spring is inside the third tube with a top end against the inner plug of the top nest and a bottom end against the inner plug of the second tube. The tube unit enjoys enhanced resilience when the automatic umbrella is opened. When the umbrella is closed, two sets of springs are compressed at separate instants and their resilience cancels each other indirectly. The strength to close the umbrella is therefore reduced.

Abstract: An improved automatic umbrella including a tube plug fixed to a top of a second tube of a telescopic tube assembly, an inner tube fixed to the tube plug within the second tube of the telescopic tube assembly, a control tube being movably fitted in the inner tube, wherein the control tube is provided with a lower control pulley at its inner bottom end and the inner tube is provided with an upper control pulley at its inner top end, and a control line being provided such that a first end of the control line is fixed to a bullet head in the telescopic tube assembly, whereas a second end of the control line is sequentially looped around the upper control pulley and the lower control pulley, and finally fixed to a top end of the control tube, whereby the umbrella can be easily folded into a fully compact form.