US2106656A - Side seam for metal can bodies - Google Patents

Description

Jan. 25, 1938. w PUNTE I SIDE SEAM- FOR METAL CAN BObIES Filed Aug. 12, 1935 l mh Fl L rlL n EL L ff Patented Jan. 25, 1938 f 2,106,656

UNITED STATES PATENT OFFICE William F. Punte, Syracuse, N. Y., assignor to Continental Can Company Ina, New York, N. Y., a corporation of New York I Application August 12, 1935, Serial No. 35,864

1 Claim. (01. 220-76) I The invention relates to new and useful imnotched at l, l, and folded back along the line provements in metal can bodies and more parb-,b to form hooks 8, 8, and abutment members ticularly to the'interlocking parts of the side 9, 9. The hooks 8, 8 and members-'9, 9, are proseam. portioned the same as the hooks 5, and mem 5 An object of the invention is to provide a side bers 6, 6, respectively. When the edges of the 5 seam wherein the edges of the body blankare body blank arejoined, the hooks 5, 5 and 8, 8, united by alternately disposed hook section and interlock as shown in Figure 5, while the mem-. lap section so constructed that the raw edges of hers 6,' 6, and'9, 9, abut as shown in Figure 4. the metal in the lap sections are concealed within 'The bumping irons are preferably so shaped that 10 the side seam.. the body portion carrying the abutment members 10 A further object ofthe invention is toj provide 6, 6, is forced outwardly as indicated in Fig. 4 a side seam of the above type wherein he metal and by the shade lines in 'Fig. 3. This brings partsforming the side seam are so constructed the members 6, 6, and 9, 9, into alinement and that the seam as viewed from the outside is vuniabutting relation; while the body portion at the form throughout the entire length-thereof. outside of the seam is uniform and without de- 15 A still further object of the invention isto propression throughout its entire length. vide a side seam of the above type wherein the The side seam thus formed includes hook secedge portions of the lap section are so disposed tions which interlock in the ordinary way, and as to mechanically-resist the shearing Strain on lap sections wherein the metal is folded back to m the solder'bond in said lap sections. provide abutment members and to conceal the In the drawing raw edges of the metal. These hook sections Figure 1 is a plan view of a body blank embodyand lap sections are relatively short and alter-- ing the improvements; v nately arranged.

Figure 2 is a view from the inside of thecan of A solder bond is applied to the outside of the Figure '3 is a view similar to Fig. 2, with the capillary attraction to the uttermost parts of the hooks interlocked and the seam bumped and side seam. Any gases forming in advance of the solder bonded; flowing solder will escape between the abutted Figure 4 isa sectional view on the line 4-4 of ends of the lap sections and from said lap sec- 4 Fig. 3; tions. Likewise, the solder will flow between the 30 Figure 5 is a sectional view on the line-5-5 of ends of the abutted members and-find a shorter Fig. 3. path tothe inner extremity of the side seams.

In the carrying out of the invention a body The solder bond thus formed is indicated at IU blank of suitable size to form a single can body in the drawing.

.3 the body blank before the hooks are joined; seam and the molten solder will flow freely by 25 is cut from sheet metal after which it is notched Certain products when hermetically sealed in a 35- and the edges shaped for joining. In Figure 1 can and treated create an internal pressure which of the drawing such a body blank is indicated at is far above the atmospheric external P su I. At the right of this figure the edge portion onthe can. This differential in pressure tends is slit at 2, 2, adjacent each end to' provide the to bulge the can particularly in the central re- 40'1ap sections 3, 3 whi h are of the. usual ohargion; In the hooksections there is a tendency 40 acter. At spaced intervals the edge portion is of the interlocked hooksto unfold witharesultingcut away as indicatedat 4, 4. The ends of the rupture of the solder'bond, The folded back porcut-away portions are disposed at right angles to tions of the lap sections are integral with the inner the edge of the blank and the inner side is parallel half ofv each hook and will restrain and prevent to said edge. This edge portion is foldedback this unfolding of the hooks. This internal pres- 45 along the broken line aa to provide'hooks. 5, 5, sure produces a shearing strain on the lap secsee Figs. 1, 2, and 5. The portions of-the body tions. The abutted end of the folded back memblank between the books 5, 5 are also folded back bers mechanically resist this shearing strain.

and form abutment members indicated at 6, 6.. From the above it will be noted that the lap Figures 1, 2, and 5. These abutment members sections cooperate with the hook sections in re- 50 are substantially half the length 'of the hooks 5, sisting, the unfolding force on the side seamdue 5,.transversely of the side seam and-are preferably to internal pressure and the hook sections coopconsiderably wider than the hooks longitudinally erate with the abutted ends in .resisting the of the side seam. I r shearing strain imposed upon the lap section.

'The other edge portion of the body blank is It is obviousthat changes can be made in the proportions and shaping' of the parts and also in the arrangement thereof, without departing from the spirit 'of the invention as set forth in the appended claim. v

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

A metal can body having its edges joined by a side seam including interengaging folded back portions which are spaced from each other lengthwise of the seam and abutted back portions between the interengaging portions, the portions of the can body in the region of the abutted folded back portions being bumped so as to contact with the folded back portions and a solder bond uniting the contacting portion throughout the entire limits of the side seam.

' WILLIAM F. PUNTE.

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