US2406911A - Method of closing sheet metal containers - Google Patents

Description

Sept. 3, 1946. H. SCHRADER 1 METHQJS OF CLOSING SHEET METAL CONTAINERS:

Original Filed May 28, 1940 WIIIII Patented Sept. 3, 1946 METHOD F CLOSING SHEET METAL CONTAINERS Herbert Schrader, Wheeling, W. Va., assignor to Continental Can Company, Inc., New York, N. Y., a corporation of New York Original application May 28, 1940, Serial No.

337,696, now Patent No. 2,338,013, dated December 28, 1943. Divided and this application December 2, 1943, Serial No. 512,606

1 Claim. 1

The invention relates to a sheet metal container of the type shown and described in my application Serial No. 337,696, filed May 28, 1940, now Patent No. 2,338,013, patented December 28, 1943, for Sheet metal containers, of which the present application is a division.

An object of the invention is to provide a method of attaching a closure end of a metal container to the container body so as to produce a tight seal connection between the body and the end.

A further object of the invention is to provide a method of connecting a closure end to a con tainer body wherein the closure end can be pried loose from the container body when it is desired to open the same.

In the drawing:

Figure 1 is a view showing in vertical section a container body and a closure member therefor which is to be attached to the container body by the improved method;

Figure 2 is a detail showing in vertical section th container body and the closure member assembled preparatory to the closing of the same;

Figure 3 is an enlarged detail showing the first step in the method of securing the closure end to the container body;

Figure 4 is a view similar to Fig. 3, but showing the curling roll as having formed a hollow bead in the flange of the closure end and as having placed said bead so as to secure the end to the closure body in sealed relation thereto;

Figure 5 is a detail in section showing the end attached to the body; and

Figure 6 is a similar view showing a tool applied for removing the end from the body without cutting or rupturing the metal parts.

The container which is closed with the improved method includes a body portion l to which a bottom end 2 is secured by a double seam 3. The body wall at the upper end thereof is rolled outwardly and downwardly into a hollow bead 4, the end of the body wall bein brought into contact with the outer wall of the body. The container is closed by a closure member 5 which has a depression formed therein surrounded by a vertical wall 6. The closure member has a depending skirt 1 which is spaced away from the vertical wall 6 so as to provide a channel 8 which fits over the bead 4 on the container body. The vertical wall 6 is of sufficient length so that when the closure member 5 is placed in the container body as shown in Fig. 2, said vertical wall will extend below the bead 4. Located inthe channel 8 is a sealing material 9. The closure end 5 has a flange l0 projecting outwardly from the skirt 1, which flange is-upturned as indicated at I I.

After the container end has been placed in the container body, then a chuck i2 is placed in the depression in the container end and this chuck will force the closure end 5 down into the container body so as to cause the sealing material to contact with the hollow bead 4 and provide a tight seal between the closure end and the body. After the container has been chucked, then a curling roll I3 is brought into contact with the flange Ill. Said curling roll has a groove M formed therein which contacts with the curled upper portion l f the flange of the closure member, and as this roll l3 moves around the chuck, it will progressively roll th flange l0 into a hollow bead l5 and force said hollow bead into contact with the bead 4, drawing the metal tightly around the bead 4. It will be noted in Fig. 4 that the end of the body wall forming the bead 4 contacts with the wall of the container and forms a rigid abutment so that during the form ,ing of the bead !5, the metal will be drawn around the bead 4 as noted, and this will cause the sealing material 9 to spread out and seal the joint between the closure and the container body. The tight seal is obtained by cooperative action of the chuck which presses the closure end into tight engagement with the sealing material and the curling roll which, as it forms the bead l5, draws the metal around the bead 4. This drawing of the metal by the curling roll is accomplished because of the fact that the curling roll moves in toward the body wall of the container in a plane which is at right angles to the body wall.

When the container end is finally secured in sealing relation to th container body, the bead I5 is still spaced away from the wall of the container body and therefore a tool which is shown at I6 in Fig. 6 may be inserted between the bead l5 and the body wall for prying the bead outward until it is completely released from the container. The closure end during the removal is slightly reformed, but is not cut or destroyed in any way so that it may be readily used as a reclosure for the container.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

A method of closing and sealing sheet metal containers consisting in rolling the body wall of the container outwardly, inwardly and upwardly into a hollow bead, forming a closure with a central depression surrounded by a vertical wall and a continuous unbroken depending skirt offset from the vertical wall to receive a gasket and the bead on the container body, said skirt being of greater length than the diameter of the bead and having a laterally projecting flange at the lower edge thereof, placing the closure member on the container body and while said gasket is 4 firmly pressed against the bead applying a curling roll to the flange of the closure and progressively rolling the flange into a bead and forcing a portion of said bead as it is formed beneath the 5 hollow bead on the body wall.

HERBERT SCI-IRADER.

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