Vacuum seal cover of circular container

Abstract

A vacuum seal cover of a circular container has a circular tabular seal ring, so that the container no longer needs a fixing protrusion, and the cover includes a sheathing hole, a plurality of air holes disposed around the cover, and an umbrella valve installed at the sheathing hole and provided for vacuuming the container or releasing the pressure through the umbrella valve. The cover is installed at an opening of the container, and the air in the container can be extracted by an air extracting device to define a vacuum and maintain the interior of the container at a vacuum condition, so as to extend the expiration of the contents stored in the container.

1 . A vacuum seal cover of a circular container, applied as a cover of said container having a circular opening, and said cover comprising:
 a protruding circular wall, disposed at the bottom of said cover, and sheathed to said opening of said container, and an external side of said circular wall forming a circular top connecting portion;   a groove, disposed around an external sidewall of said circular wall;   a tabular seal ring, installed at said groove and having a portion exposed to the outside;   a sheathing hole, disposed on the surface of said cover, and having at least one air hole disposed around the periphery of said sheathing hole; and   an umbrella valve, installed to said sheathing hole, and having a patch with a width sufficient to cover said air hole, a press button disposed above said patch, and a stopping portion disposed under said patch for inserting said umbrella valve into said sheathing hole.   
   
   
       2 . The vacuum seal cover of  claim 1 , wherein said circular wall has a diameter slightly smaller than an opening of said container, such that after said circular wall is plugged into said opening, said exposed seal ring is pressed between said circular wall and an internal wall of said container. 
   
   
       3 . The vacuum seal cover of  claim 1 , wherein said top connecting portion forms a pulling portion at an extended and expanded position of said top connecting portion, such that said pulling portion is provided for users to lift and separate said cover from the opening of said container easily. 
   
   
       4 . The vacuum seal cover of  claim 1 , further comprising a folded edge disposed concavely and downwardly from the connecting position of said press button and said patch. 
   
   
       5 . The vacuum seal cover of  claim 1 , wherein said cover has an indent downwardly extended from and concavely disposed on a surface of said top cover, and said sheathing hole is disposed at said indent.