| 摘要 |
A three-stage collapsible umbrella of the type which has rib assemblies each comprising a main rib, support rib, roof rib and auxiliary support rib, which are arranged and mutually related so that the ribs are stretched and closed automatically in response to umbrella opening and closing operations, additional tip ribs pivotally connected to the ends of roof ribs which form, when the umbrella is opened, extensions of roof ribs and is folded, when the umbrella is closed, alongside the roof ribs, and elongate sliding means which are operatively connected to the rib assemblies and tip ribs so that the tip ribs are stretched automatically by the pulling action of the sliding means when the rib assemblies are stretched. Each of the elongated sliding means is supported so that the sliding means is independently movable by a small distance along the lengthwise direction thereof. The umbrella is particularly provided with spring means each of which forces each of the elongated sliding means associated therewith to slide toward a direction of folding each of the tip ribs during the umbrella closing operation until such tip rib has been folded. The tip ribs are thus folded automatically in response to the umbrella closing operation. The spring means further act as spring means for automatically closing the umbrella.
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