Collapsible umbrella with a reliable and smooth self-opening mec

Details Collapsible umbrella with a reliable and smooth self-opening mec Collapsible umbrella with a reliable and smooth self-opening mec

1998-01-22

1999-02-02

Mai, Lanna

Tent, canopy, umbrella, or cane

Umbrella

Rib and stretcher joints

135 31, A45B 2500

Patent

active

058652000

ABSTRACT:
A collapsible umbrella with a self-opening mechanism is provided. The collapsible umbrella includes a stretchable multi-segment shaft having a top end and a bottom end; an upper fixed hub mounted axially on the top end of the shaft, the upper fixed hub being formed with a plurality of alignment slots and a threaded hole, the threaded hole allowing a finishing cap of either an inner-threaded type or an outer-threaded type to be mounted thereon; a running hub slidably mounted on the shaft; a collapsible frame of a plurality of ribs including a set of upper ribs, a set of inner branch ribs, a set of middle branch ribs, a set of linkage ribs, and a set of outer branch ribs, wherein each of the middle branch ribs is formed with a substantially U-shaped cross section to form a slot and integrally formed with a retaining piece; a fabric held on the collapsible frame; and elastic means which allows the collapsed umbrella to be thereafter expanded in a self-opening manner. The foregoing collapsible umbrella allows a more secured and reliable self-opening mechanism for the umbrella. Moreover, it allows either an inner-threaded type or an outer-threaded type of finishing cap to be mounted on the upper fixed hub of the umbrella for versatile utilization.

REFERENCES:
patent: 3672381 (1972-06-01), Kida et al.
patent: 4030515 (1977-06-01), Weber
patent: 4986294 (1991-01-01), Wu
patent: 5392799 (1995-02-01), Lai
patent: 5492140 (1996-02-01), Lin et al.
patent: 5551463 (1996-09-01), Wang

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