Tent – canopy – umbrella – or cane – Umbrella – Ribs and stretchers
Reexamination Certificate
2000-02-22
2001-10-02
Friedman, Carl D. (Department: 3635)
Tent, canopy, umbrella, or cane
Umbrella
Ribs and stretchers
C135S025100
Reexamination Certificate
active
06296001
ABSTRACT:
BACKGROUND OF THE INVENTION
For making multiple-fold umbrella, the weight of the rib assembly is expected to be decreased as much as possible. If all ribs of the rib assembly are made of aluminum alloy, the umbrella weight can be greatly reduced. However, the aluminum rib may be easily deformed or broken when subjected to strong wind.
U.S. Pat. No. 5,931,175 to the same inventors of this application disclosed a top rib (1) made of light materials including aluminum alloy and an outer rib (2) made of composite or plastic materials for forming a rib assembly especially adapted for making a single-fold umbrella. However, it did not disclose a rib assembly for making triple fold or multiple-fold umbrella.
The present inventor has found the drawbacks of the prior arts and invented the present rib assembly for multiple-fold umbrella having a plastic intermediate rib interconnected among other light ribs.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a rib assembly for multiple-fold umbrella including: an aluminum top rib pivotally secured to an upper notch formed on a top portion of a central shaft, an aluminum stretcher rib pivotally connected between the top rib and a lower runner slidably held on the central shaft, a plastic intermediate rib interconnected between the top rib and an aluminum or plastic outer rib, an aluminum connecting rib pivotally connected between the stretcher rib and the intermediate rib, and a spring rib slidably coupled to the intermediate rib by a ring member fastened on the intermediate rib; with the plastic intermediate rib interconnected among those light ribs for strengthening the rib assembly substantially made of light-weight materials.
REFERENCES:
patent: 5931175 (1999-08-01), Lin et al.
patent: 6035873 (2000-03-01), Lin et al.
Chang Jung-Jen
Lin Chung-Kuang
Dougherty & Troxell
Friedman Carl D.
Fu Tai Umbrella Works Ltd.
Varner Steve
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