Windproof umbrella

Abstract

A windproof umbrella includes a shank (10); a runner (12) on the shank (10); ribs (20); a canopy (101); stretchers (30); U-shaped first joints (51) each secured onto the rib (20); U-shaped second joints (61) each slidably put on the rib (20); U-shaped third joints (71) each secured onto the stretcher (30); auxiliary rods (40); and sets of first, second, and third pivotal members (52, 62, and 72). The first pivotal member (52) is formed at the other end of the stretcher (30) and is pivotably connected to the first joint (51). The second pivotal member (62) is formed at one end of the auxiliary rod (40) and is pivotably connected to the second joint (61). The third pivotal member (72) is formed at the other end of the auxiliary rod (40) and is pivotably connected to the third joint (71). In response to strong wind, the second joint (61) slides to change an angle between the rib (20) and the stretcher at the first joint (51). Therefore, the wind escape capability of windproof umbrella (1) of the invention is greatly increased.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The invention relates to umbrellas and more particularly to a windproof umbrella with improved characteristics.[0003]2. Description of Related Art[0004]Conventionally, umbrellas are classified as symmetrical ones having a circular canopy with a shank extending downward from a center of the canopy and non-symmetrical ones having a non-circular canopy with a shank extending downward from a non-central position of the canopy as shown in FIG. 1. As shown in FIG. 2, canopy area to the left of the shank has a length S and canopy area to the right of the shank has a length L greater than length S.[0005]Typical symmetrical umbrellas are not capable of withstanding strong wind which exerts a force against the inner surface of canopy. Thus, it is often that the canopy inverts from its normal operable position to an outwardly convex or bowed position. For typical non-symmetrical umbrellas, they even provide little resistance to invers...

AI Technical Summary

Benefits of technology

[0009]It is therefore one object of the invention to provide a improved windproof umbrella comprising a shank; a runner on the shank; a plurality of ribs; a canopy; a plurality of stretchers; a plurality of U-shaped first joints each secured onto the rib; a plurality of U-shaped second joints each slidably put on the rib; a plurality of U-shaped third joints each secured onto the stretcher; a plurality of auxiliary rods; and a plurality of sets of first, second, and third pivotal members. The first pivotal member is formed at the other end of the stretcher and is pivotably connected to the first joint. The second pivotal member is formed at one end of the auxiliary rod and is pivotably connected to the second joint. The third pivotal member is formed at the other end of the auxiliary rod and is pivotably connected to the third joint. In response to strong wind, the second joint slides to change an angle between the rib and the stretcher at the first joint with the frame being flexibly deformed. By utilizing the invention, the following advantages including sufficient wind escape and durability can be obtained.

Problems solved by technology

Typical symmetrical umbrellas are not capable of withstanding strong wind which exerts a force against the inner surface of canopy.

For typical non-symmetrical umbrellas, they even provide little resistance to inversion due to high wind.

However, this umbrella holding manner has the danger of blocking view while walking as shown in FIG. 3.

This is not desirable.

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