Vessel cap

Abstract

A plurality of indication pieces and extending from a lower edge of a crown-shaped cap body to be screwed onto a container are joined through a bridge, there is provided a flap formed by turning up a portion of one of the indication pieces to be engaged with a protrusion stripe engagement portion on a lower portion of a neck part of the container, the flap passes over the protrusion stripe engagement portion and is removed from the container together with the cap body without being left on the neck part of the container, when the flap passes over the protrusion stripe engagement portion, the indication piece with the flap is displaced outward so as to break the bridge joining the adjacent indication pieces and with the indication piece whereby the cap opening proof is indicated, and the flap is developed relative to the indication piece when the flap passes over the protrusion stripe engagement portion to be engaged with the flap protrusion prevention provided on the adjacent indication pieces and whereby the leading end of the flap never protrudes inside of the inner peripheral face of the cap body.

1 . A container cap comprising a crown-shaped cap body to be screwed onto a container and cap opening proof indication means formed provided at a lower edge of said cap body and having no part left on a neck part of said container after said cap opens said container, characterized in that said cap opening proof indication means comprises a plurality of indication pieces extending from said lower edge of said cap body and a bridge to join the adjacent indication pieces and to be broken due to relative displacement of said adjacent indication pieces when said cap should open said container and a flap provided at a portion of at least one of said adjacent indication pieces in a manner where said flap is able to be bended and having a leading edge to be engaged with a protrusion stripe engagement portion on a lower portion of said neck part of said container and in that said indication piece adjacent to said indication piece with said flap is provided with flap protrusion prevention to prevent said flap developed when said cap opens said container from protruding from an inner face of said cap body.  
   
   
       2 . A container cap as set forth in  claim 1  and wherein said flap protrusion prevention is so formed as to prevent said leading edge of said flap.  
   
   
       3 . A container cap as set forth in  claim 1 , wherein said indication piece with said flap and said indication piece adjacent to said former indication piece form one indication means unit and the adjacent indication means units are provided in a manner spaced circumferentially.  
   
   
       4 . A container cap as set forth in  claim 1 , wherein said indication piece adjacent to said indication piece with said flap is disposed on both sides of said indication piece with said flap.  
   
   
       5 . A container cap as set forth in  claim 4  and wherein said flap protrusion prevention comprises small width formation portion formed on the opposite faces of said indication pieces on both sides of said indication piece with said flap toward the direction where the opposite faces approach each other.  
   
   
       6 . A container cap as set forth in  claim 5  and wherein said small width formation portion of said flap protrusion prevention comprises a thinner piece extending integrally from the opposite inner sides of said both side indication pieces.  
   
   
       7 . A container cap as set forth in  claim 5 , wherein said small width formation portion of said flap protrusion prevention has an inclination face inclined downward and outward and said corresponding flap has an inclination face to be slipperily moved along said inclination face of said flap protrusion prevention.  
   
   
       8 . A container cap as set forth in  claim 1 , wherein said indication piece with said flap has a recess into which said flap is contained so that said flap never protrudes inside of said inner peripheral face of said cap body when said flap is superposed on said corresponding indication piece in a state where said flap is bended.