Stackable metal cup

Abstract

A stackable metal cup including: a body portion having a hollow shape with an open upper portion and having a shape inclined from the upper portion toward a lower portion such that an upper end inner diameter is larger than a lower end outer diameter; and a bottom portion including a grounding portion, the grounding portion being continuous with a lower end of the body portion via a curvature portion. When a height from the grounding portion to the upper end is 100%, an upper region having a height of 70% to 100% includes at least one inflection point portion at which an inclination angle of the body portion with respect to a vertical plane changes.

1 . A stackable metal cup comprising:
 a body portion having a hollow shape with an open upper portion and having a shape inclined from the upper portion toward a lower portion such that an upper end inner diameter is larger than a lower end outer diameter; and   a bottom portion including a grounding portion, the grounding portion being continuous with a lower end of the body portion via a curvature portion, wherein   when a height H from the grounding portion to the upper end is 100%, an upper region A1 having a height of 70% to 100% includes at least one inflection point portion α at which an inclination angle of the body portion with respect to a vertical plane changes.   
     
     
         2 . The stackable metal cup according to  claim 1 , wherein
 the at least one inflection point portion α at which the inclination angle of the body portion changes is formed in a lower region A2 having a height of 40% or less.   
     
     
         3 . The stackable metal cup according to  claim 1 , wherein
 an inclination angle difference Δθ defining the inflection point portion α is 25 degrees or less.   
     
     
         4 . The stackable metal cup according to  claim 1 , wherein
 at least four of the inflection point portions α at which the inclination angle of the body portion changes are formed in an intermediate region A3 between the upper region A1 and the lower region A2.   
     
     
         5 . The stackable metal cup according to  claim 1 , wherein
 the inflection point portion α is an intersection between a reference vertical wall having an inclination angle of 2 degrees or less with respect to a vertical plane and an inclined wall having an inclination angle difference Δθ with respect to the reference vertical wall.   
     
     
         6 . The stackable metal cup according to  claim 4 , wherein
 inclination angle differences Δθ defining the inflection point portions α formed in the intermediate region A3 are all smaller than inclination angle differences Δθ defining the inflection point portions α existing in the upper region A1 and the lower region A2.   
     
     
         7 . The stackable metal cup according to  claim 6 , wherein
 each of the inclination angle differences Δθ defining the inflection point portions α formed in the intermediate region A3 is 10 degrees or less.   
     
     
         8 . The stackable metal cup according to  claim 1 , wherein
 the height H from the grounding portion to the upper end is in a range of 90 to 150 mm, and the upper end inner diameter of the opening is in a range of 65 to 95 mm.