Container wall with rupturable weakening line

A sheet metal container closure comprising an end wall for closing a container and having a score line therein and an integral substantially V-shaped hollow rib in the wall across the score line projecting from the plane of the wall toward the interior of the container a distance of at least seven times the metal thickness, said score line being adapted to be ruptured in response to digital force applied against said rib to form a vent opening in said end wall.

A container wall having a score line therein for forming an opening in the wall and an integral hollow rib in the container wall across the score line, said hollow rib having a projection measured perpendicular to the general plane of the container wall of at least five times the material thickness opposite the direction from which opening pressure is to be applied to stress the material in the score line across the rib in tension and fracture such material.

A container wall having a score line therein and an integral hollow rib in the wall across the score line projecting into the container at least five times the material thickness for locally stressing the material in the score line across the rib in tension to fracture such material when pressure is applied against the exterior surface of the wall.

An end wall for a container including a concavo-convex button projecting outwardly from the wall, a hollow rib projecting inwardly of the container across the center of the button and a score line across the rib which will be ruptured by pressure applied against the exterior surface of the wall.

A metal container wall having a score line therein for forming an opening in the wall and an integral hollow rib in the wall across the score line projecting into the container multiple times the metal thickness for locally stressing the metal in the score line across the rib in tension to fracture such metal when force is applied against the exterior surface of the wall at the score line.