US2171714A - Solderless side seam for sheet metal containers - Google Patents

Description

Sept. 5, 1939. H. SCHRADER 2,171,714

SOLDERLESS SIDE SEA FOR SHEET METAL CONTAINERS Filed April 8, 1938 Mama/1 5 Patented Sept. 5, 1939 UNITED STATES PATENT OFFICE SOLDERLESS SIDE SEAM FOR SHEET METAL CONTAINERS Application April 8, 1938, Serial-No. 200,987

2 Claims.

The invention relates generally to metal receptacles, particularly those in which the can bodies include side seams of the well known lock and lap type, and has for an object to provide 5 a container embodying a liquid tight side seam devoid of solder.

Many efiorts have been made to produce a.

sheet metal can body wherein the side seam is made liquid tight without the use of a solder l bond. In order to accomplish this, sealing compounds, seam dopes, or packing strips have been incorporated in the side seams. These efforts have been only partially successful because ithas been impossible effectively to seal the considerable length of lap portions of the seams lying between the end closures and the hook termini.

In its more detailed nature therefore, the invention resides in the provision of a container comprising a body, and end closures seam-secured thereon, said body including a side seam of the lock and lap type in which the lap portions are sufliciently short so that during the rolling of the closure securing seams the lap portions will be wholly rolled into the seams and the interlocked hooks brought into the clamping range of the rolled parts of the double seam and gripped thereby so as to form an eflective end seal at the juncture of the hook and 30 lap portions.

Another object of the invention is to provide in a container of the character stated a novel form of solderless lock and lap seam embodying seam sealing means and means for preventing both longitudinal and lateral movement freedom of the seam components.

With the above and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and

the several views illustrated in the accompany-' ing drawing.

In the drawing- Fig. l is a face view of the notched blank from which the can body is to be formed;

, Fig. 2 is a face view of the blank shown i Fig. 1 with the hooks bent into position;

Fig. 3 is an edge view of the blank shown in Fig. 7 is an enlarged detail horizontal section taken on the line l-'| of Fig.

Fig. 8 is an enlarged detail horizontal section taken on the line 8-8 of Fig. 5;

Fig. 9 is an enlarged detail vertical section taken through the sideseam, the edge portion of the can body being turned out to receive the end closure, and an end closure being loosely applied thereon.

Fig. 10 is an enlarged detail vertical section of the completed seam.

Container side seams of the lock and lap type are well known, and examples of this seam and apparatus for forming it are to be found in the patent to Troyer, 1,772,820, issued August 12, 1930.

In the practical development of the invention the blank 5 is suitably notched to form portions from which inner and outer hooks 6 and I are bent as shown, in Figs. 1 and 2 of the drawing, and blank portions 8 which extend beyond the hooks and form the lap portions of the seam.

It will be noted by reference to Figures 3 and ,4 of the drawing that the lap'portions 8 extendingbeyond the hooks 6 and I are made sufliciently short in length so that they will be wholly rolled into the double roll seams by which the end closures are secured upon the can body, thus causing the ends of the hook portion of the seam to be brought into the clamping range of the rolled parts of the double seam and gripped thereby was to form an effective end seal at the juncture of the hook and lap portions. See I also Fig. 10.

A suitable dope, sealing compound or packing material 9 is applied to the portions of the blank which engage to form the side seam so as to fill and effectively seal the interstices between the lock and lap portions of the seam. I am aware that compound sealed, solderless seams have heretofore been, proposed, but in all such seams of which I am aware it has been impossible to form a perfect liquid seal at the ends of the hook portions, or rather the juncture of the hook and lap portions of the seam. By clamping these portions with the rolled parts of the double seam as shown in Fig. 8 a perfect liquid seal can be formed without the use of solder. It is to be understood that the end portions of the side seamed can bodies are outwardly turned in the usual manner as indicated at ID to receive the end closure members. In Fig. 9 of the draw- .ing I have shown an end closure loosely applied to a can body preparatory to being seam-secured thereon. The end closure includes the usual body portion ll countersunk to receive the chuck and to provide a heel portion I 2 which fits snugly within the can body and which is gripped, together with the flange portions l3 of the end closure and 8 of the body which make up the double roll seam, between the chuck and the first and second operation seaming rollers in the well known manner during the formation of the double roll seam. The completed double roll seam is designated l4.

During the bumping of the interlocked hooks 5, I, an abutment rib I5 is thrown up from the metal bordering the inner hook 6 in position for lying snugly behind the return bend juncture of the outer hood 1 and the can body portion which supports it as shown in Figs. '7 and 8 of the drawing. The rib extends substantially the full length of the hook portion of the seam but terminates at its ends as at "5 just short of each lap portion of the seam thus avoiding the presentation of any crevices which might render difiicult the formation of a perfect liquid seal.

The abutment rib l5 effectively locks the side .seam against strains of compression tending to cause the hooks 6 and 1 to slip or creep relatively laterally, and the clamping of the hook portions of the side seam by the end closure seams serves not only to perfectly seal the side seam at the juncture of the hook and lap portions of the seam but also to secure the hooks against, any strains set up through the ends of the can and tending to cause the hooks to move relatively longitudinally.

What I claim is:

1. A sheet metal container comprising a body portion having its edges joined by a solderless side seam including interlocking hooks and lap portions at the ends thereof, a sealing material between the engaging hooks and the lap portions, a closure member for each end of the can. each closure member having a depression forming a vertical wall adapted to contact with the inner wall of the can body, and a projecting flange adapted to be rolled downwardly and inwardly into an end seam, said interlocking hooks being extended into the end seam between said vertical wall of the depression and downwardly and inwardly rolled parts of the end seam whereby said interlocking hooksare gripped therebetween and a tight 'seal formed in the region adjacent the ends of the hooks.

2. A sheet metal container comprising a body portion having its edges joined by a solderless side seam including interlocking hooks and lap portions at the ends thereof, the metal of the can body adjacent the interlocking hooks being shaped so that the inner side of the inner hook is in alinement with the'inner wall of the can body, and the metal in the body wall adjacent the base of the outer hook being bent outwardly to form a rib for holding the hooks interlocked until the end seams are formed, a sealing material between the engaging hooks and the lap portions, a closure member for each end of the can, each closure member' having a-depression forming a vertical wall adapted to contact with the inner wall of the can body, and la projecting flange adapted to be rolled downwardly and in-- wardly into an end seam, said interlocking hooks being extended into the end seam between said vertical wall of the depression and the downwardly and inwardly rolled partsof the end seam whereby said interlocking hooks are gripped therebetween and a tight seal formed in the region adjacent the ends of the hooks.

HERBERT SCHRADER.

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