| 摘要 |
A telescopic tube structure for automatic umbrellas includes a tube assembly comprised of an outer tube, a middle tube, and an inner tube, which are telescopically interconnected; wherein a plug is fixedly fitted into a top portion of the middle tube, a bullet-shaped element is provided in the tube assembly, a runner string is connected to the bullet-shaped element at a first end thereof, and is sequentially looped around a first runner-string pulley at a top portion of the tube assembly and a second runner-string pulley of a runner and then connected to a cap at a second end thereof, an outer-tube string is connected to the bullet-shaped element at a first end thereof, and is looped around an outer-tube string pulley of the plug and connected to a bottom portion of the outer tube at a second end thereof The structure may allow umbrellas to be operated more conveniently.
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