Method of forming a pressure resistant end shell for a container

Details Method of forming a pressure resistant end shell for a container Method of forming a pressure resistant end shell for a container

1977-11-04

1978-08-29

Keenan, Michael J.

B21D 5144

Patent

active

041095995

ABSTRACT:
A method is disclosed for forming an end shell to allow a reduction of the gauge of the end shell without loss of pressure holding capabilities or, alternatively, to increase the pressure resistance of the container to which the end shell is secured. This method comprises the steps of providing a sheet metal end shell having a substantially planar central wall portion, a first curved portion around the periphery of the central wall portion connecting the central wall portion with an integral frustoconical wall portion, a peripheral flange projecting radially outwardly from and integral with the frustoconical wall portion, and exterior and interior surfaces respecting its intended use on a container; supporting the central wall portion with a first supporting means disposed against the interior surface thereof opposite said frustoconical wall portion substantially concentrically of the end shell to within less than approximately 97.5% of the diameter of the central wall portion; supporting the peripheral flange with a second supporting means disposed against at least a portion of the exterior surface thereof; and reducing the distance between the peripheral flange and the central wall portion by moving at least one of the supporting means toward the other to form the outer peripheral portion of the central wall portion downwardly and inwardly toward the first supporting means into the shape of a reinforcing channel around the central wall portion.

REFERENCES:
patent: 1385290 (1921-07-01), Welling
patent: 2017460 (1935-10-01), Hothersall
patent: 3417898 (1968-12-01), Bozek et al.
patent: 3537291 (1970-11-01), Hawkins
patent: 3843014 (1974-10-01), Cospen et al.
patent: 4031837 (1977-06-01), Jordan

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