Cover structure

Abstract

A cover structure is disclosed. When an annular sealing portion of a cover body is engaged with a container, a sealing section of the annular sealing portion abuts against an annular inner surface of the container, and then, a folding section of the annular sealing portion is folded to a sealing state, so that part of the folding section abuts against the annular outer surface of the container to form a dual leak-proof sealing structure. The folding section of the annular sealing portion is an annular elastic and full-peripheral tightening structure. Therefore, the sealing between the container and the cover may be strengthened for a good sealing effect, and preventing liquid in the container from being splashed on surrounding articles. When the folding section is in the unsealing state, the cover can be separated from the container, which is convenient to carry and use.

What is claimed is: 
     
         1 . A cover structure suitable for use with a container, the container including an annular inner surface and an annular outer surface opposite the annular inner surface, and the cover structure comprising:
 a cover body configured for covering the container, wherein an annular sealing portion that is capable of airtightly engaging with a top edge of the container is arranged along a peripheral edge of the cover body, the annular sealing portion is elastically arranged around a periphery of an opening of the container, and includes a sealing section capable of abutting against the annular inner surface, and a folding section connected to the sealing section, the folding section is capable of being switched between a sealing state and an unsealing state, when the folding section is folded to the sealing state, part of the folding section is abutted against the annular outer surface, and when the folding section is folded to the unsealing state, the folding section stops abutting against the annular outer surface.   
     
     
         2 . The cover structure as claimed in  claim 1 , wherein when the folding section is folded to the sealing state, a thickness of the sealing section is greater than a thickness of the folding section. 
     
     
         3 . The cover structure as claimed in  claim 1 , wherein the annular outer surface includes a concave area, and when the folding section is folded to the sealing state, the folding section forms a sealing area to press against the concave area and to airtightly match with the concave area in a convex-and-concave manner. 
     
     
         4 . The cover structure as claimed in  claim 1 , wherein the cover body is made of silicone material. 
     
     
         5 . The cover structure as claimed in  claim 1 , wherein the cover structure has a centerline, the folding section includes a first end connected to the sealing section, and a second end opposite the first end, when the folding section is folded to the sealing state, a distance from the centerline to the first end is L 0 , a distance from the centerline to the second end is L 1 , and the distances L 0  and L 1  meet the following condition: L 0 >L 1 , when the folding section is folded to the unsealing state, a distance from the centerline to the first end is L 2 , a distance from the centerline to the second end is L 3 , and the distances L 2  and L 3  meet the following condition: L 3 >L 2 .