Tent – canopy – umbrella – or cane – Umbrella – Cover or lining feature
Reexamination Certificate
2001-03-26
2003-02-18
Wilkens, Janet M. (Department: 3637)
Tent, canopy, umbrella, or cane
Umbrella
Cover or lining feature
C135S033400
Reexamination Certificate
active
06520193
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an umbrella with vents on the umbrella cloth for venting wind, wherein by changing the shape of the umbrella cloth and adding a portion formed by a plurality of suspending cambered-elements, the wind within the umbrella can vent out rapidly and thus the wind pressure within the umbrella is released.
BACKGROUND OF THE INVENTION
The umbrella is a tool for shielding sunlight or raindrops. In general, an umbrella mainly comprises an umbrella frame and umbrella cloths for shielding sunlight and rain. The umbrella frame has a shaft and a plurality of main ribs and a plurality of supporting ribs. The umbrella cloth covers the umbrella frame so that as the umbrella is expanded, it can be used to shield raindrops or sunlight. After the umbrella is folded, it can be carried and stored conveniently.
As described hereinabove, the umbrella cloth is formed by a single layer of opaque cloth. In general, the structure of the umbrella cloth is dense for achieving the object of shielding sunlight and rain. Therefore, it is not preferred in air ventilation. Therefore, as the user walks with holding an umbrella in sunlight or rains, since air under the umbrella cloth can not be ventilated effectively, and further since a high temperature will be induced from the radiation of sunlight so that the space in the umbrella will be dull and thus, the user will feel uneasy. Furthermore, in typhoon, the wind pressure within the umbrella can not be released effectively and thus it is often the umbrella will turn upside down.
In order to increment the effect of ventilation, the prior art umbrella provides to structures. One is illustrated in
FIG. 9
, wherein the umbrella cloth
3
is formed by a lower cloth
30
and an upper cloth
31
. In order to match the expansion of the main ribs
41
, a plurality of openings
301
are formed between the lower cloth
30
and the main ribs
41
. The upper cloth
31
is slightly smaller than the lower cloth. When the umbrella is assembled, the upper cloth
31
covers concentrically on the lower cloth
30
and then they are firmly secured to each main rib
41
of the umbrella frame
40
. The plurality of openings
301
of the lower cloth
30
is shielded by the upper cloth
31
. By this compound type umbrella cloth, when the umbrella is expanded, air may flow into gaps between the periphery
311
of the upper cloth
31
and the lower cloth
30
. Then, the air flows to the space of the umbrella from the openings
301
in the upper cloth
30
so as to increase the flowing of the air under the umbrella or to prevent the umbrella from turning upside down as a large wind applies thereon.
Another structure of the umbrella is illustrated in
FIG. 10
, in that the umbrella
5
has a lower cloth
50
and an upper cloth
51
. The lower cloth
50
is formed to be matched to the configuration of a complete expanding main ribs. The center of the lower cloth
50
is installed with a round web
501
. As the umbrella is expanded for use, air flows into the gap between the periphery
511
of the upper cloth
51
and the web cloth
501
of the lower cloth
50
so as to increase the air convection in the umbrella, or the air may flow in the reverse direction so as to release the air pressure in the umbrella.
However, there are many defects in the aforesaid two compound umbrella cloth structure so that the use and manufacturing of the umbrella can not achieve an optimum effect. The reasons will be described in the following:
1. The effects of air convection and venting of wind pressure are not good: in the aforesaid two structures, the upper and lower umbrella cloths are concentrically overlapped on the umbrella ribs. When the umbrella is expanded, the upper and lower umbrella cloths are expanded by the main ribs. The outer periphery of the upper cloth almost adhered to the surface of the lower cloth so that the gap between the upper cloth and the lower cloth is too small, and thus air can not flow into the space in the umbrella successfully, or the wind pressure in the umbrella can not be smoothly released out. As a result, the effects of air convection and venting of wind pressure is not preferred.
2. Too much material is necessary for the umbrella cloths: in the aforesaid to prior art compound umbrella cloth, the upper cloth and lower cloth have a larger area so that overlapping area between the upper cloth and lower cloth are too large to be suitable. Especially, the outer periphery of the upper cloth shown in
FIG. 9
is expanded by expensive elastic strips and then is fixed to the periphery of the lower cloth so that the cost for the material of the umbrella cloth is high.
3. The process for manufacturing the umbrella is complex: in the aforesaid prior art compound type structure, other than using umbrella cloth with a larger area, the lower cloth is formed with a plurality of openings or is connected to web cloth for air convection or venting of wind pressure. Therefore, the process for manufacturing the lower cloth is complex.
With reference to
FIGS. 11 and 12
, the U.S. Pat. No. 6,155,278 discloses a further prior art umbrella. The umbrellas can be used to improve the defects in the aforesaid two prior art umbrellas. In this prior art, the inner periphery of the lower cloth
21
has two sides which are formed with extension portions
212
on the main ribs
11
. After it is stitched with the main ribs, a triangular overlapping portion
214
is formed, which is formed with a wind outlet
202
between the lower edge
201
of the upper cloth
20
and the upper edge
211
of the lower cloth
21
(see FIG.
12
). Since the wind outlet
202
is confined to the tension force at two end points as the extension portion
212
is firmly stitched to the main ribs
11
. Therefore, a large wind outlet
202
can not be achieved. Furthermore, an angle of almost 90 degrees is formed between the extension portion
212
and the upper edge
211
of each unit cloth of the lower cloth
21
, it is very difficult in stitching the umbrella cloth. The stitching speed will be reduced greatly so that the manufacturing cost is high. Moreover, each unit cloth in the lower edge
201
of the upper cloth
20
is stitched to its respective unit cloth of the lower cloth
21
in a tension condition. Therefore, the wind outlet
202
is narrow and thus, the effect of venting wind pressure is very slight.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide an umbrella with vents on the umbrella cloth for venting wind pressure and increasing the convection of air under the umbrella cloth so that the manufacturing process is simplified and the cost is down.
To achieve above objects, the present invention provides an umbrella with vents on the umbrella cloth for venting wind. The umbrella comprises an umbrella frame and an umbrella cloth. The umbrella cloth comprises an upper cloth and a lower cloth. The upper cloth occupies most space of a surface of the umbrella; and the lower cloth is installed at a lower periphery. A lower periphery of the upper cloth covers upon the upper periphery of the lower cloth. An upper periphery of each unit of the lower cloth is a non-linear cambered portion. A suspending element is combined to the cambered upper portion of the lower cloth so as to be formed as a continuous multiple-lobe element having a plurality of cambered-recess portions at the upper periphery of the lower cloth. Therefore, an upper periphery of each unit of the lower cloth is loosely connected to each respective unit of upper cloth so that a plurality of vents are formed between the upper periphery of the lower cloth and the lower periphery of the upper cloth. As a result, the convection of air under the umbrella cloth is increased and the wind pressure is released.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
REFERENCES:
patent: 3456661 (1969-07-01), Farley
patent: 5482069 (1996-01-
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