| 摘要 |
A self-opening umbrella utilizing tension springs for self-opening operation is disclosed and comprises a rod or stick with a crown secured on the top thereof, a plurality of roof ribs having their respective base ends thereof pivotably mounted to the periphery of the crown, a slider member roof rib, each slider member being slidable along its associated roof rib, a lower sliding sleeve slidably mounted around the rod or stick and including connection means for connecting the end of an associated tension spring, an upper sliding sleeve slidably mounted around the rod or stick and above the lower sliding sleeve, a brace member associated with each roof rib and pivotably connected at one end thereof to the slider member and having its otherwise free end pivotably connected to the upper sliding sleeve, and an axial compression spring disposed between the upper sliding sleeve and the connection means of the lower sliding member, the tension spring being connected at its otherwise free end to an associated brace and at a point near the associated slider member, whereby maintaining the umbrella in an open condition is attained utilizing little force and, hence, the force necessary for closing the umbrella is reduced.
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