| 摘要 |
Expansible type triangular umbrella ribs and the related collapsing mechanism, wherein the expansible first main rib is arranged to penetrate through the second main rib which is connected with the linking rib, the rear end of the first main rib being directly connected with the front end of the first support rib by pivotal joint, the rear end of the linking rib being pivotally connected to the first support rib, such that the first main rib is expansible to slip along the pivotal connecton between the second main rib and the linking rib; the first main rib, the linking rib and the first support rib being to form a triangular rib structure, the front U-channel of the first support rib being to provide an prolonged flange for receiving the rear portion of the linking rib; the first main rib, the linking rib and the first support rib being arranged in a straight line at the time the umbrella being fully opened; at the time the pivotal connection of the first main rib and the first support rib being attached to the linking rib on a slant, no gap being left between the first main rib, the first support rib and the linking rib, and the torsional force being minimized and the stability of the rib strcuture being improved; by means of the arrangement of the protruding circular tail at the send step of the central shaft to stop the gap between the lower nest plate and the first step of the central shaft at the time the umbrella being opened, the lower nest plate being stabilized to prevent the umbrella rib strcuture from sudden collapsing.
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