| 摘要 |
A pull cord mechanism for a self-opening umbrella mainly comprises a core tube rest to support the first and second sheaves on one side. The core tube rest links the core tube at the lower end. Both core tube rest and core tube are housed in the hollow of the center shaft where the core tube rest comes on top. A cord retainer is installed at bottom of the center shaft. The lower shaft provides the third and fourth sheaves. The pull cord has one end tied to the cord retainer and the other end runs through the core tube, winding on the first sheave on the core tube rest, turning to the third sheave of the lower shaft, the second sheave on the core tube rest and down to the fourth sheave of the lower shaft and finally fastened to the top of the core tube rest to form a complete loop. The winding arrangement of pull cord enables to shrink the length of the center shaft and reduce the volume of the closed umbrella.
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