Two-piece can construction

Details

Inventors: Jones, Walter C.;
Assignee: United Can Company (Fullerton, CA)
Primary Examiner: Price; William
Assistant Examiner: Marcus; Stephen
Attorney, Agent or Firm: Knobbe, Martens, Olson, Hubbard & Bear

A two-piece can and method for making the same wherein the cup portion has a bottom panel integral with the sidewall. The interface of the bottom panel with the sidewall in the cup has a wall bead which is of the same outside configuration as the connection of the upper rim of the cup to the separate top panel. The bottom panel in the cup portion has a specific profile to withstand the internal pressures within the can during the recooking phase of the substance sealed within the can. The profile has a bottom bead which is closely adjacent the interface of the bottom panel with the sidewall and has a very tight radius between the sidewall and the bead to provide a strengthening rib for the prevention of buckling during the reheating phase.

DETAILED DESCRIPTION The present invention utilizes the cup portion wherein one end of the can is integral with the sidewall and wherein the interface of this one end with the sidewall is designed to produce a wall bead of similar configuration as the double seam produced by the connection of the top panel to the upper flange of the sidewall.
Consequently, the two-piece can of this invention results in an outward appearance similar to the typical three-piece can.
This allows the canners to utilize the two-piece can with their present machinery designed for three-piece cans, eliminating the concern for the orientation of the can as was the case with prior art two-piece cans, because either end of the two-piece can is able to accommodate a typical household can opener, such as the electric type which is used to remove either end panel.
The present two-piece can invention utilizes a specific bottom profile on the bottom panel of the cup portion in order that the can will withstand the internal pressures caused in the recooking phase of the canning process.
Since the gauge of metal used in the bottom of the cup portion will be the same as the lesser gauge metal used in the sidewall, it is necessary that the design of the bottom panel be such to provide strength to withstand the pressures associated with internal cooking.
This profile utilizes a bottom bead closely adjacent the wall bead at the interface of the bottom panel and the sidewall.
Between the bottom bead and the wall bead of the bottom panel is a tight radius or semicircular turn which represents a strengthening rib around the bottom panel to prevent possible buckling of the bottom panel as its bulges during the recooking phase.
This enables the two-piece can to utilize in the bottom panel the thinner gauge metal as is used in the sidewall panel.
The configuration of the two-piece can shown herein allows the canners presently using three-piece cans to also incorporate the use of two-piece cans in their present machinery.
There is the ability to interchange the use of three-piece cans with the use of two-piece cans

Related patents

	Process for secondary recovery OF THE INVENTION Prior to practicing the process of this invention it is sometimes desirable to open up a communication path through the formation by a hydraulic ...
	Composition of a conductive ceramic glaze and improved method of forming same OF THE PREFERRED EMBODIMENTS While the invention is particularly pointed out and distinctly claimed in the concluding portions herein, a preferred embodiment is set ...

0.024
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved