Patent ID: 8066133
Filing Date: 2011-11-29
Classification: B65D

Abstract:
1. A synthetic resin cap comprising: a cap body having a top plate portion and a cylinder portion hanging from a circumferential edge portion thereof; an annular inside seal projection to be fitted into a container mouth portion formed on an inner surface of the top plate portion; a connector portion that connects the top plate portion and the inside seal projection formed between the inner surface of the top plate portion and an inner surface of the inside seal projection; an outside thin wall portion which is thinner than the circumferential edge portion formed on the top plate portion at any position between a portion where the inside seal projection is formed and the circumferential edge portion; wherein the top plate portion at the portion corresponding to the inside of the inside seal projection has an outer circumferential side portion where the connector portion is formed, and an inside thin wall portion that is formed on the inside of the outer circumferential side portion; and wherein the cap further comprises a first transition section that transitions from the annular inside seal projection to the outer circumferential side portion in a radially inward direction and a second transition section that transitions from the outer circumferential side portion to the inside thin wall portion in a radially inward direction, wherein the inside thin wall portion is thinner than the outer circumferential side portion, which is thinner than the annular inside seal projection in a direction perpendicular to the top plate.