Cap body of beverage container

Abstract

There is provided a cap body of a beverage container where a large amount of beverage in a container body doesn't flow out, and a lid member is not vigorously released even if hot beverage is put in the container, and where a degree of freedom to select a spring is improved by alleviating impact force in an opening operation, the cap body of the beverage container comprising: a cylindrically-shaped drinking mouth member releasably provided in a mouth portion of a container body; a lid member connected to the drinking mouth member via a hinge axis; a spring for urging the lid member to the opening direction; and a lock member provided in a position against the hinge axis of the drinking mouth member for maintaining the lid member in a closing state, wherein the drinking mouth member comprises a drinking mouth formed in the lock member side of a peripheral wall of the upper opening; a bottom wall where hinge axis side is made higher than the drinking mouth side; a liquid hole formed in the drinking mouth side and an air hole formed in a hinge axis side on a connection line between the hinge axis side and the lock member side, and the lid member comprises an inner cap provided with a seal member for sealing the liquid hole and the air hole, and furthermore, a shoulder member provided in the container body is connected to the lid member and the hinge axis, and the hinge axis supporting portion of the shoulder member is provided with a protrusion portion to which the lid member slidably contacts in an opening operation of the lid member.

What is claimed is:  
     
         1 . A cap body of a beverage container comprising: 
 a cylindrically-shaped drinking mouth member releasably provided in a mouth portion of a container body;    a lid member connected to said drinking mouth member via a hinge axis for opening and closing an upper opening of said drinking mouth member;    a spring for urging said lid member to the opening direction; and    a lock member provided in a position diametrically against said hinge axis of said drinking mouth member for maintaining said lid member in a closing state,    wherein said drinking mouth member comprises a drinking mouth formed in said lock member side of a peripheral wall of said upper opening; a bottom wall where said drinking mouth side thereof is made lower and said hinge axis side thereof is made higher; a liquid hole formed in said drinking mouth side and an air hole formed in a hinge axis side on a connection line between said hinge axis side of said bottom wall and said lock member side, and said lid member comprises an inner cap provided with a seal member for sealing said liquid hole and said air hole.    
     
     
         2 . The cap body of the beverage container of  claim 1 , wherein an uppermost margin of said drinking mouth is formed in an uppermost position of an upper peripheral wall of said drinking mouth member.  
     
     
         3 . A cap body of a beverage container comprising: 
 a cylindrically-shaped shoulder member releasably provided in a mouth portion of a container body;    a lid member for opening and closing an opening portion of said shoulder member;    a hinge axis being inserted into a hinge axis supporting portion of said shoulder member and a hinge axis receiving portion of said lid member;    a spring provided in said hinge axis for urging said lid member to the opening direction; and    a lock member provided in a position diametrically against said hinge axis for maintaining said lid member in a closing state,    wherein at least one of said hinge axis supporting portion or said hinge axis receiving portion is provided with a protrusion portion to which said lid member or said shoulder member slidably contacts, in an opening operation of said lid member.    
     
     
         4 . The cap body of the beverage container of  claim 3 , wherein said protrusion portion is such formed that a radial dimension thereof becomes gradually larger toward the opening direction of said lid member.  
     
     
         5 . The cap body of the beverage container of  claim 3  or  4 , wherein slidable contact between said protrusion portion and said lid member or said shoulder member is linear contact.  
     
     
         6 . The cap body of the beverage container of  claim 3  or  4 , slidable contact area between said protrusion portion and said lid member or said shoulder member increases according to an opening operation of said lid member.  
     
     
         7 . The cap body of the beverage container of  claim 5 , slidable contact area between said protrusion portion and said lid member or said shoulder member increases according to an opening operation of said lid member.