| 摘要 |
An umbrella mechanism (10) comprises a central post (12), eight ribs (14) that are pivotally connected to the post, a sliding hub (16) that is slideably retained on the post, eight struts (18) that each extend between a particular rib (14) and the sliding hub (16), eight tensioning cords (20) and a gas spring (22) that is disposed at an upper end of the central post for exerting a pulling force on the tensioning cords. The ribs are pivotally displaceable between a collapsed condition wherein the ribs (14) are disposed adjacent the post (12) and an open condition wherein the ribs extend radially from the central post. Each tensioning cord is connected at one end to an upper end of the gas spring and at the other end, to a distal end of a particular rib. The gas spring exerts a pulling force on the tensioning cords for assisting in lifting the ribs.
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