AIRTIGHT COVER
An airtight cover aims to cover an opening edge of a container and includes an upper rigid lid and an airtight flexible plate located below the upper rigid lid. The airtight flexible plate includes a sealing rim in contact with the opening edge and a central portion and a peripheral portion located respectively on an inner side and an outer side of the sealing rim. The sealing rim and upper rigid lid are interposed by a gap. When the airtight flexible plate contacts with the opening edge through the sealing rim to make the central portion continuously move downward, the peripheral portion is forced to warp upward, and the upper rigid lid presses the peripheral portion to bend downward. Hence the contact area between the sealing rim and opening edge increases, which can securely seal the container to meet requirements of usage.
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The present invention relates to an airtight cover and particularly to an airtight structure for the airtight cover,
BACKGROUND OF THE INVENTIONPlease referring to
The aforesaid conventional airtight cover 1 is simple in operation and adaptable to containers 2 in different sizes, hence is widely used as a temporary lid. However, when the airtight cover 1 is used to seal the container 2, due to its center is pressed to sink slightly into the container 2, the rim of the airtight cover I Warps upward. This makes the contact area between the airtight cover 1 and opening 3 become smaller. As a result, the air isolation effect becomes worse and a small gap is easily generated. Moreover, the upward warping rim of the airtight cover 1 causes users inconveniences when in use. For instance, users could incidentally hit the airtight cover 1 when they move the container 2 and result in loosening and dropping of the airtight cover 1 to lose the air isolation effect thereof.
SUMMARY OF THE INVENTIONTherefore the primary object of the present invention is to provide an airtight cover that is adaptable to various types of containers and provides satisfactory airtight effect to meet requirements of usage.
Another object of the present invention is to provide an airtight cover that is adaptable to various types of containers and provides function of vacuum pumping for preservation.
The airtight cover of the invention aims to cover an opening edge of a container and includes an airtight flexible plate and an upper rigid lid. The airtight flexible plate is located below the upper rigid lid and includes a sealing rim in contact with the opening edge and a central portion and a peripheral portion that are located respectively on an inner side and an outer side of the sealing rim. The upper rigid lid includes an installation hole, and the airtight flexible plate includes an air vent which corresponds to the installation hole and holds a check valve. The upper rigid lid and a distal end of the upper rigid lid are interposed by a gap.
By means of the structure mentioned above, when the airtight flexible plate contacts with the opening edge through the sealing rim to make the central portion sink continuously downward, the peripheral portion is forced to warp upward. Meanwhile, the upper rigid lid compresses the peripheral portion and sealing rim downward to increase the contact area between the sealing rim and opening edge, so as to form secure sealing of the container. In addition, after the check valve has been installed on the upper rigid lid the interior of the container can be vacuumed via an air extraction duct. When vacuum is formed inside the container, a pressure difference between an inside and an outside of the container is formed, therefore the airtight flexible plate and the upper rigid lid are pressed downward by the atmospheric pressure. Hence the peripheral portion is securely pressed downward and the central portion sinks severely downwards to further increase the contact area between the sealing rim and the opening edge, thus the vacuum airtight effect of the container can be maintained longer to preserve the goods and meet requirements of usage.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
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The upper rigid lid 30 also includes an annular grasp portion 31 which is extended upward from the upper rigid lid and includes an installation hole 32 formed therein. The airtight flexible plate 20 includes an annular flange 24 corresponding to and latched on the installation hole 32 to allow the airtight flexible plate 20 and upper rigid lid 30 to couple together.
The airtight flexible plate 20 further includes a groove 25 formed on the peripheral portion 23 and an inverse flange 26 extended from the groove 25, and the upper rigid lid 30 includes a flange 33. The flange 33 can be held in the groove 25 and encased by the inverse flange 26 so that the upper rigid lid 30 and airtight flexible plate 20 can be in contact with each other closely and smoothly to press the peripheral portion 23 downward.
The airtight flexible plate 20 further includes an air vent 27 formed in the annular flange 24 to hold a check valve 40 for an unidirectional evacuation. The check valve 40 is made of flexible material and gradually shrunk to form a duck-beak end 41 with a crevice 42 formed therein. When the check valve 40 forms a positive pressure inside, the check valve 40 is pushed to open the crevice 42 and discharge air. When the positive pressure is absent, the duck-beak end 41 generates naturally a compression force due to its geometric shapes to close the crevice 42 to form an airtight structure.
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As a conclusion, through the structure that the upper rigid lid compresses the airtight flexible plate downward, the contact area between the airtight flexible plate and opening edge increases, therefore the airtight effect can be enhanced. In addition, the invention can provide vacuuming effect through disposing the check valve. When the container is vacuumed inside, the pressure difference between the inner side and the outer side of the container is formed, and the airtight flexible plate and the upper rigid lid are pressed downward by the atmospheric pressure. Thus, the peripheral portion of the airtight flexible plate is further compressed to bend downward, and the central portion sinks more to further increase the contact area between the sealing rim and opening edge, thus can keep the container in a vacuumed airtight condition even longer to meet requirements of usage.
Claims
1. An airtight cover for covering an opening edge of a container, comprising:
- an airtight flexible plate including a sealing rim in contact with the opening edge and a central portion and a peripheral portion located respectively on an inner side and an outer side of the sealing rim; and
- an upper rigid lid which is located above the airtight flexible plate, and includes an annular grasp portion which is extended upward from the upper rigid lid and includes an installation hole, wherein the airtight flexible plate includes an annular flange corresponding to and latching on the installation hole, and wherein the sealing rim and a distal end of the upper rigid lid are interposed by a gap.
2. The airtight cover of claim 1, wherein the airtight flexible plate includes a groove formed on the peripheral portion, and the upper rigid lid includes a flange corresponding to the groove.
3. The airtight cover of claim 2, wherein the airtight flexible plate includes an inverse flange extended from the groove.
4. The airtight cover of claim 1, wherein the airtight flexible plate includes an air vent formed in the annular flange to hold a check valve.
5. The airtight cover of claim 4, wherein the check valve is gradually shrunk to form a duck-beak end with a crevice formed therein.
Type: Application
Filed: Nov 19, 2013
Publication Date: Mar 20, 2014
Applicant: KATTOE CO., LTD. (Taichung)
Inventor: Wei Ling CHEN (Taichung)
Application Number: 14/083,964
International Classification: B65D 51/16 (20060101); B65D 45/02 (20060101);