Umbrella frame

Details Umbrella frame Umbrella frame

1999-07-06

2001-01-02

Chin-Shue, Alvin (Department: 3634)

Tent, canopy, umbrella, or cane

Umbrella

Utility Patent

active

06167894

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved umbrella, especially to an umbrella frame that is strengthened by providing a secondary rib with each main rib of the frame, so that the umbrella frame will not invert as easily.
2. Description of Related Art
As shown in
FIGS. 1 and 2
, a typical conventional umbrella has a frame (
10
) and a panel (
14
) attached to the top of the frame (
10
). The frame (
10
) normally comprises a shaft (
11
), an upper nest (
111
), a runner (
112
), a plurality of ribs (
12
) and a plurality of stretchers (
13
).
The upper nest (
111
) is securely fixed on the top end of the shaft (
11
) by a cap (
113
) screwed onto the end of the shaft (
11
). The ribs (
12
) have one end pivotally attached to the upper nest (
111
). The stretchers (
13
) have one end pivotally attached to the runner (
112
) and the other end pivotally attached to the corresponding rib (
12
) by a joint positioned in the upper middle region of the rib (
12
). The runner (
112
) is movable along the shaft (
11
). To open the umbrella, a user pushes the runner (
112
) upward so the stretchers (
13
) extend the corresponding ribs (
12
) up and out to stretch the panel (
14
) on the ribs (
12
) of the frame (
10
).
However, since the structure of the frame (
10
) is relatively simple and the strength of the frame (
10
) is limited, the panel (
14
) of an opened conventional umbrella is easily blown into an inverted shape by a very strong wind, which will may result in damage to the ribs (
12
) of the frame (
10
).
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a strengthened umbrella frame that has a secondary rib provided in conjunction with the normal main rib to strengthen the structure of the umbrella against the wind.
The features, benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 1628539 (1927-05-01), Grey
patent: 2788792 (1957-04-01), Koller
patent: 3156249 (1964-11-01), Biderman
patent: 5640984 (1997-06-01), Dubunsky
patent: 5655557 (1997-08-01), Martin

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