Tent – canopy – umbrella – or cane – Umbrella – Collapsible in length
Patent
1992-12-14
1993-08-17
Chilcot, Jr., Richard E.
Tent, canopy, umbrella, or cane
Umbrella
Collapsible in length
135 29, 135 31, 403206, 403119, A45B 1900
Patent
active
052359980
ABSTRACT:
A rib structure of multiple-fold umbrella having enchanced strength and allowing to be opened and closed more smoothly characterized essentially in that the outermost end of the inner intermediate main rib is formed into a bifurcated portion within which a back-up joint in U-shaped cross section is pivotally connected for fitting thereinto and the inner end of the outer intermediate main rib is pivotally connected to the back-up joint and the outermost end of the inner intermediate main rib, thereby to increase the strength of the umbrella ribs, and that a back-up resilient part is provided between the inner intermediate main rib and the intermediate linking rib or between the outer intermediate main rib and the outer linking rib such that when opening the umbrella, the ribs are straightened and stretched for smooth unfolding by means of the acting force of the back-up resilient part and linkage of the ribs before the umbrella cloth is subject to external force and, when closing, the ribs can be folded intrinsically also by means of the resilient force of the back-up resilient part.
REFERENCES:
patent: 1474821 (1923-11-01), Hartzell
patent: 1490924 (1924-04-01), Hartzell
patent: 3705593 (1972-12-01), Weber
patent: 4658844 (1987-04-01), Ping
patent: 4984599 (1991-01-01), Hwang
patent: 5063953 (1991-11-01), Wu
patent: 5073060 (1991-12-01), Pethers
patent: 5121764 (1992-06-01), Wu
patent: 5144971 (1992-09-01), Seidel et al.
Chilcot Jr. Richard E.
Mai Lan M.
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