Replacement cap for vessel

Abstract

In a replacement cap for a vessel, in which a cap body 2 is mounted on a mouth portion 1 a of a vessel 1 so as to be replaceable so that a liquid in the vessel 1 can be drunk through a tube 5 provided on the cap body 2, the cap body 2 is provided with an air supply port 4 having cup-shaped valve means 10 which is closed normally and is opened to supply the outside air into the vessel 1 when the interior of the vessel 1 becomes at a negative pressure. Since the valve means 10 is opened to supply the outside air into the vessel 1 when the interior of the vessel 1 becomes at a negative pressure, a liquid in the vessel 1 can be drunk smoothly through the tube 5.

1 . A replacement cap for a vessel, in which a cap body is mounted on a mouth portion of said vessel so as to be replaceable so that a liquid in said vessel can be drunk through a tube provided on said cap body, wherein said cap body is provided with an air supply port having cup-shaped valve means which is closed normally and is opened to supply the outside air into said vessel when the interior of said vessel becomes at a negative pressure.  
     
     
         2 . The replacement cap for a vessel according to  claim 1 , wherein said valve means is composed of a valve element which has elasticity and is provided with an air hole in the top portion thereof and a protrusion which opens and closes said air hole.  
     
     
         3 . The replacement cap for a vessel according to  claim 1  or  2 , wherein said tube is composed of an internal tube and an external tube, and said internal and external tubes are connected to tube connecting portions projectingly provided on the inside and outside of said cap body, respectively.  
     
     
         4 . The replacement cap for a vessel according to any one of  claims 1  to  3 , wherein said tube is formed of elastomer or a silicone material.  
     
     
         5 . The replacement cap for a vessel according to any one of  claims 1  to  4 , wherein the length of said internal tube is set so that the tip end of said internal tube reaches a position near the inside bottom portion of said vessel, and a sucking member is installed at the tip end of said external tube.  
     
     
         6 . The replacement cap for a vessel according to  claim 5 , wherein said sucking member installed at the tip end of said external tube consists of a nipple.  
     
     
         7 . A replacement cap for a vessel, which is configured so that said replacement cap has a cap body mounted on a mouth portion of the vessel so as to be replaceable and a tube provided on said cap body, and said cap body has an air supply port penetrating the inside and outside faces of said cap body and valve means which is provided in said air supply port so as to be capable of opening and closing said air supply port according to the sucking operation of said tube.