초록 ▼

A drawn and ironed can body has a cylindrical side wall and an integral end wall which closes one end of the side wall. The end wall includes a rim that generally curves inwardly from the side wall and a domed central section which closes the area circumscribed by the rim, all such that the rim form

A drawn and ironed can body has a cylindrical side wall and an integral end wall which closes one end of the side wall. The end wall includes a rim that generally curves inwardly from the side wall and a domed central section which closes the area circumscribed by the rim, all such that the rim forms the lowest portion of the can body. The rim is configured such that when the can body is subjected to elevated internal pressures, the rim deforms in a controlled manner, and this deformation causes the domed wall to move axially away from the opposite end of the can body without buckling, thereby increasing the volume of the can body.

대표청구항 ▼

A metal can body that is capable of undergoing a controlled deformation when subjected to elevated internal pressures, said can body comprising: a cylindrical side wall and an end wall connected to the side wall and closing one end of the can body, the end wall including an annular peripheral sectio

A metal can body that is capable of undergoing a controlled deformation when subjected to elevated internal pressures, said can body comprising: a cylindrical side wall and an end wall connected to the side wall and closing one end of the can body, the end wall including an annular peripheral section that extends downwardly from the side wall and inwardly toward the center axis of the can body, a circular, dome-shaped center section located inwardly from the peripheral section with its concave surface being presented downwardly, and at least two additional sections located between the peripheral section and the center section and serving to connect the peripheral section and the center section, one of the additional sections being connected to the peripheral section and extending generally inwardly therefrom, said one additional section being substantially the frustum of a shallow cone that is inclined upwardly away from the peripheral section, the width of said one additional section being substantially less than the radius of the dome-shaped center section, another of the additional sections being oriented in a generally upright disposition and being connected to the center section at a band in the metal of the end wall, with the bend being located substantially above said one additional section and the domed-shaped center section being located entirely above the two additional sections, said other additional section extending generally downwardly from the center section and being disposed at a steep angle with respect to said one additional section, the can body when the end wall is subjected to elevated internal pressures being adapted to permanently yield along the periphery of said one additional section such that the inclination of the one additional section changes and the one additional section becomes a downwardly and inwardly directed continuation of the peripheral section, whereby the other additional section and the dome-shaped center section shift downwardly to increase the volume of the can body.