US2475107A - Shipping box - Google Patents

Description

K. K. NEWSOM SHIPPING BOX Filed March 6, 1945 7 Sheets-Sheet l IN V EN TOR.

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/ SHIPPING 301! Filed Harsh 6, 1945 7 Sheets-Sheet 5 IN VEN TOR. lrncuswsk K. Nswsom 4 4, m mg,

HTTOKNE VJ .inly 5 19490 K. K. NEWSOM 2,475,107

SHIPPING BOX Filed Harsh 6, 1945 7 Sheets-Sheet 7 INVENTOR.

Kncnsuse If. Ngwram UNITED STATES PATENT OFFICE 6 Claims. 1

This invention relates to a box of fiberboard, and the word "fiberboard is intended to include sheet material such as plain or corrugated cardboard of semi-rigid sheet material to be creased and folded.

Heretofore fiberboard shipping boxes, such as egg cases, fruit cases and commodity cases generally, will bulge outwardly on their bottoms, particularly'when the load they carry is fairly heavy. This tendency to bulge is just as prevalent in fiberboard boxes having one or more partitions therein, and it may be even worse in such boxes inasmuch as they are ordinarily larger. This bulging is detrimental to both the box itself during handling and to the contents and it adds to the difficulties in properly stacking the boxes. Also, in horizontally elongated fiberboard boxes the elongated sides will bulge outwardly. In certain instances this tendency has been corrected to a degree by connecting a central partition in the box with an inner liner or layer of material of the box, as in my copending application, Serial No. 532,245, filed April 22, 1944, now abandoned.

One of the objects of this invention is the provision of an improved fiberboard box construction that includes means for preventing objectionable bulging of the bottom of the box.

Another object of the invention is the provision of a fiberboard box and partition therein that are constructed and assembled in a manner whereby the partition will function for its intended purpose and will also prevent the bulging of the bottom of the box.

A still further object of the invention is the provision of a fiberboard box and partition therein that are so constructed and assembled that the partition will function to prevent the bulging of the sides and bottom of the box.

Another object of the invention is the provision of a fiberboard box and partition that are adapted for quick assembly and which partition is adapted to take the load of the contents of the box that would normally cause bulging of the bottom and so distribute it as to eliminate said bulging, and which box and partition are formed to coact for holding the partition in the box and against its bottom without the use of staples, cement, tape, clips, etc.

Other objects and advantages will appear in the description and in the drawings.

In the drawings, Fig. 1 is a plan view of a blank from which the preferred box is formed.

Fig. 2 is an enlarged plan view of the blank for forming a partition.

. 2 i Fig. 3 is a perspective view'oi the partition folded preparatory to insertion in a box, such as formed from the blank of Fig. 1.

Fig. 4 is a reduced perspective view of a partition that is slightly diflerent than the one shown in Figs. 2, 3 but which is adapted to be fitted in the box that is to be formed from the blank of Fig. 1.

Fig. 5 is an enlarged perspective view, partly broken away and in section, showing theblank of Fig. 1 folded to form the box and the partition of Fig. 3 secured therein.

Fig. 6 is a reduced perspective view illustrati r iig o5ne of initial steps of setting up the box of Figs. '7, 8 are perspective views showing two successive steps (after that of Fig. 6) in setting up the box.

Fig. 9 is a perspective view illustrating the method of positioning the partition of Fig. 3 in the box preparatory to so folding part of the box as to secure the partition therein.

Fig. 9a is a part sectional part elevational view of the box of Fig. 5 loaded with fillers or cartons, the sectioned portion of the box being taken along line Bet-9a of Fig. 9b but the load of fillers or cartons being shown in elevation.

Fig. 9b is a sectional view taken along line 912-911 of Fi 90.

Fi 10 is a plan view of a blank for forming a box that is slightly different from the box formed from the blank of Fig. 1.

Fig. 11 is an enlarged plan view of a partition adapted to be used in the box to be formed from the blank of Fig. 10 and which'partition includes portions that are adapted to extend fully over the inner opposed sides of said box.

Fig. 12 is a reduced perspective view showing one of the initial steps in setting up the box from the blank of Fig. 10.

Fig. 13 is a perspective view showing another step in setting up the box from the blank 01 Fig. 10 and which step follows the one shown in Fig. 12.

Fig. 14 is a perspective view showing the partition of Fig. 11 in folded position but separate from the box.

Fig. 15 is an enlarged perspective view, partly broken away and in section, showing the blanks of Figs. 10, 11 folded and in assembled relationship.

Fig. 16 is a plan view of a different form of blank than is shown in Fig. 11 but which blank is adapted to be folded to form a partition for insertion in the box formed from the blank of Fig. 10.

Fig. 17 is a reduced plan view of the box folded from the blank of Fig. 1 with the partition of Fig. 16 folded and secured therein, part .of the bottom of said box being broken away and in section.

Fig. 18 is a plan view of a blank of slightly different form than is shown in Fig. 16.

Fig. 19 is a reduced perspectivev view of the blank of Fig. 18 in folded position separate from the box in which it is to fit.

Fig. 20 is a reduced perspective view of the box in which the folded blank of Fig. 19 is adapted to be fitted, but which box is shown extended preparatory to folding over the bottom flaps to form the bottom.

Fig. 21 is an enlarged perspective view, partly broken away and in section, showing the partition of Fig. 19 assembled in the box of Fig. 20 after the bottom flaps of the latter are folded over to form the bottom wall of the box.

Figs. 1 to 91), inclusive In detail, the blank of Fig. 1 is elongated and is substantially rectangular. The dot-dash lines shown on the blank indicate folding creases or scores. In so far as structure is concerned, this blank and the box formed therefrom, independently of the partition, are identical with the blank and box disclosed in my copending application hereinbefore mentioned, said blank being longitudinally creased along parallel spaced lines I, 2, 3, 4, reading from top to bottom in Fig. 1. From left to right are folding creases 5, 6, 1, 8. The left hand crease defines the juncture between a tab 9 that projects from the body of the box, and which tab is adapted to be secured to the opposite end of the blank when the blank is folded into substantially tubular form along creases 6, 1, 8 as seen in Fig. 8.

When the blank is folded into said tubular form along lines 6, 1, 8, the rectangular portions I0, I I that are respectively defined by creases 2, 5, 6 and I, 2, I, 8 constitute the outer layers of the opposed end walls of the box to be formed, while the rectangular portions l2, l3 that are respectively defined by creases I, 2, 5, 1 and I, 2, 8 and the free edge H of the blank opposite tab 9 constitute the outer layers of the opposed side walls of the box to be formed.

The creases 6, 1, 8 terminate at one of their ends at crease and from said crease upwardly the blank is slit or slotted in upward extension of said creases to the upper free edge of the blank. The slots in such upward extension of creases 6, 1. 8 respectively, are designated |5, |6, l1 and they constitute divisions between flaps l8, I9, 20, 2|, reading from left to right, which flaps are adapted to be folded at right angles t the portions I0, I 2, l3 respectively, carrying them for forming the top closure of the box.

Transverse creases 5, 1, 8 terminate at their opposite ends at crease 2, and the blank is slotted at 22, 23, 24 in downward extension of said creases to the free edge of the blank that is opposite the flaps l8 to 2|.

The creases 2, 3, 4 are substantially equally spaced from each other, and the space between each adjacent pair is substantially the same as the width of the flaps |3 to 2| from crease I upwardly to the free edge of the blank, while the distance from crease 4 to the lower free edge of the blank is about equal to the distance between creases I, 2. This structure enables the provision of double layered bottom folding flaps and furnishes an inner layer for the sides and ends of the box at the same time.

The portions of the blank below each outer end wall portion III, II and between creases 2, 4 are slotted at 25, 26 exactly centrally of their horizontal widths from crease 2 to crease 4 and which slots extend transversely across crease 3 and which latter crease divides said slotted portions respectively into outer and inner flap layers or portions 21, 28 and 29, 30, which layers are intended to come together in approved relation upon folding the portions outwardly and downwardly of crease 3 (as seen in Fig. 1) or above crease 3 (as seen in Fig. 6) into the box.

The portions of the blank of Fig. 1 below crease 2 and between said crease and crease 4 are respectively divided by crease 3 into outer and inner flap layers or portions 3|, 32 and 33, 34, and the portions 35, 38, 31, 38 that are respectively below inner flap portions 26, 32, 2'1, 34 are respectively adapted to lie against the portions l0, l2, |3 when the box is folded to form the inner layers of the end and side walls of the box. The inner wall portions 36, 31 and inner flap layers 32, 34 are respectively 'divided horizontally by slots 39, 40 that extend from crease 4 to the lower free edge of the blank of Fig. 1.

The partition for the box, when folded or set up, is a substantially rectangular blank formed with a central folding crease 4| (Fig. 2) to enable folding the blank on itself for forming a double layer of material. Folding creases 42, 43 are parallel with crease 4| and are equally spaced from the ends of the blank to provide marginal strips 44, 45 alon said opposite ends. Folding creases 46, 41 at right angles to crease 4| are equally spaced from the lateral edges, or top and bottom edges of the blank as seen in Fig. 2, thus providing marginal strips 48, 49 outwardly of said creases 46, 41. The marginal strips 44, 45 are respectively divided in their length by slots 50, 5| and the marginal strips 48, 49 are respectively divided by slits or slots 52, 53 that are in extension of crease 4|. Strips 44, 45 and 48, 49 terminate at their ends at the intersections of creases 42, 43 with- creases 46, 41.

In preparing the partition blank for insertion into the box, said blank may first be folded on itself along crease 4| as seen in Fig. 3, after which the strips 48, 49 which are in lateral extension of the main body portions 55, 56 of the partition, are folded to project oppositely outwardly of the partition. The marginal portions 44. 45 are now folded oppositely outwardly to provide opposite outward projections at the lower edge of the partition.

A convenient method of setting up the box is to fold the blank of Fig. 1 into tubular form and to then connect the tab 9 with the opposite end of the blank in any suitable manner, as already stated. This tubular form may then be inverted as seen in Fig. 6 so as to position the top folding flaps I8 to 2| at the bottom of the tube. The upward extensions of the outer end portions In, H above crease 2 are folded into the box along crease 3 thus bringing the inner layers 35, 31 against the inner sides of the portions IO, N and also bringing the outer and inner flap portions 21, 28 and 29, 30 together to form double layered folding flaps for part of the bottom of the box. These double layered flaps are then bent toward each other from opposite ends of the box (Fig. 2) and the upward extensions of the sides l2, l3 above crease 2 are inserted through slots 25,

26 into the box as seen in Fig. 7, until the portions 3i, 36 are horizontal and lie flat against the outer end flap layers 21. 29 (Fig. 8)'.

As soon as the box is completed to the point shown in Fig. 8 it may be set upright as seen in Fig. 9 and then the partition is placed in the box so that the body portions 66, 66 of the partition is in slots 39, 46 while said portions 36, 36 extend through slots 66, ii in projections 44, 46 of the partition. The projections or extensions 46, 46 will be in engagement with the inwardly facing sides of the portions l2, l3 as the partition is inserted into the box, and as soon as the projections 44-, 46 reach the upper sidesof the outer flap layers 3|, 36 the inner flap layers 32, 34 are folding outwardly to overlie the projections 44, 46 that are at opposite sides of slots 66, 5| and to also overlie the double layered end flap portions 21, 26, at one end of the box and 29, 36 at the other end, while the inner side walls 36, 36 will be against the outer side walls l2, 13. Thus it will be seen that the partition is releasably locked to the bottom of the box and to the side walls.

The partition of Fig. 4 differs from that of Fig. 3 in providing longer projections 61, 66 than the projections 44, 46 oi. Fig. 3. Otherwise the partition of Fig. 4 is the same as that of'Fig. 3 and the parts that are similar to those in Fig. 3 bear the same numbers. The projections 44-, 45 of the partition in Fig. 4 may extend to the end'walls oi! the box or to the inner and edges of the double layered end flaps 21, 26 and 29, 66, as desired, and such extension may be preferred where the contents oi the box is loose material, such as fruit or the like. Where, as in egg cases, fillers such as indicated at 59 in Figs. 9a and 9b are loaded into the box at opposite sides of the partition and extend between the partition and the end walls, the projections 44, 45 may be relatively short.

The projections 44, 45 indicated in Figs. 9a,, 9b are considerably exaggerated in thickness, but the thickness of the fiberboard is exaggerated for clarity.

It will be seen in Fig. 90. that the load of fillers '99 at the center of the box rests on the projections 44, 49 and as the partition carrying said pro jectioris extends from side to side of the box, the said load is transferred from the said projections to the partition and from thence to the points where the double layered bottom flaps 3|, 32 and it, 64 join the side walls of thebox. As this strain .on' the partition is in the plane of the latter, there can be no possible bulging of the bottom of the box outwardly along the center of the bottom. The load of the fillers at the ends of the box is taken by the double layered end flaps 21!, 26 and 29, 36 as well as by the double layered side flaps ii, 32 and 33, 34. As the fillers themselves are relatively rigid in the planes of their side walls, which are vertical, it will be apparent that the bottom of the box, at no point, will bulge outwardly. The fillers from a bridge between the end flap portions and the projections 44, 46, with the flap portions 3|, 32 and 33, 34 hold the end flap portions and the said projections in place "and also contribute to supporting the load.

Figs. 16 to 14 inclusive The form of invention shown in Figs. to 14 7 includes the construction whereby the partition this form, the blank for forming the box itself is somewhat abbreviated so as to eliminate the portions that form the inner side and end walls. Insltead, the partition provides the inner side w ls.

In detail, the blank of Fig. 10 from which the box is formed is provided witha tab 66 for securing the blank in-tubular form as seen in Fig. 12. glhis tab corresponds with tab 9 of the blank of The blank is elongated and formed with spaced parallel creases 6|, 62, 63, reading down in Fig. 10, while creases 64, 66, 66, 61 extend transversely of the length of the blank, reading from left to right in Fig. 1. Crease 61 merely extends along the juncture of the tab 66 and the blank.

The opposite end walls of the box to be formed are designated 66, 69, the former being outlined by creases 6|, 62, 64, 66 while the latter are outlined by creases 6|, 62, 66, 61. The opposite side walls of the box to be formed are numbered 16, 1| and are respectively outlined by creases 6|, 62, 65, 66 and 6|, 62, 61 and the'free edge 12 of the blank opposite tab 66.

The top closure flaps for closing the top of the box are along the upper edge of the blank of Fig. 10, and from left to right are designated 13, 14, 15, 16. Flaps 13, 15 are connected with the ends 66, 69 of the box and are separated from the flaps 1 4, 16 that are on the sides 16, 1| by slots 11, 18, 19. Said slots are in extension of creases 65, 66.

The top flaps 13 to 16 are along crease 6|, while long crease 62 that is along the opposite edges of i the end walls 66, 69, are bottom closure flaps 66, 6| respectively divided by slots 82, 63 that are at right angles to crease 62. These and flaps terminate at their outer ends along a line that is coincident with crease 63.

Along the edges of side walls 16, 1| that are defined by crease 62 are portions 64, 65 of bottom flaps, whichportions form the outer layer of these flaps when the box is formed inasmuch as they carry portions 66, 31 that are along the opposite side of crease 63, which latter portions form the inner layer when folded against or over thebuter layers 64, 66. Said flap portions 66, 61 are respectively divided intermediate their ends by slots 66, 69 that extend at right'angles from crease 63 outwardly to the free edges of said portions 66, 61. When flap portions 66, 61 are folded over on portions 64, 65 they provide double layer bottom closure'flaps secured to side walls 16, 1| but these portions do not have extensions that extendover the side walls as in the case of the blank of Fig. 1 nor do the end closure flaps 86, 6| carry such extensions.

The partition for the box to be formed from the blank of Fig. I0 is shown in Fig. 11 and comprises a blank that has elements corresponding with those of the blank shown on Fig. 2 except that the marginal portions in the blank of Fig. 11 are appreciably longer. Said blank of Fig. 1 is symmetrical and formed with a central crease 96 for folding on itself. Parallel creases 9|, 92 equally spaced from the upper and lower edges of the blank provide pairs of projections 93, 94 and 95, 96 above and below creases 9|, 92 respectively. The projections 93, 94 are separated from each other by a, slit or slot 91 that is in extension of crease 96, while the projections 95, 96 that are below crease 92 are separated by a similar slit or slot 66 in downward extension of crease 96. as viewed in Fig. 11.

The body 96 of the blank of Fig. 11 adjoining crease 96 and at the left side thereof and between creases 9i, 92 is formed with a pair of projections I66, I61 along its left hand edge (and divided from said body portion 99 by a folding crease I02 that is parallel with crease 90. A slot I03 separates said projections, which slot is at right angles to crease I02.

The body I04 of the blank 01' Fig. 11 adjoining crease 90 and at the side thereof opposite portion 99 is formed with projections I05, I08, crease I01 and slot I08 that are identical in every respect with the projections I00, IOI and crease I02 and slot I03, except that they are on portion I04 which in itself is identical with portion 99. When portions 99, I04 are folded along crease 90 to come together, these portions form the partition for the box.

In Fig. 14, the blank of Fig. l is shown in folded position preparatory to insertion into the box.

The projections 93, 94 and 95, 96 are bent to extend oppositely outwardly of the partition at right angles to the latter, and the projections IOI, I02 and I05, I06 are also bent to extend oppositely outwardly of the partition.

In Fig. 12, the blank of Fig. 10, the tab 60 has been connected to the opposite end of the blank and the blank is bent to tubular shape with the top closure flaps I3 to I6 lowermost. The next step in setting up the box is to fold the split end fiaps 80, 8I inwardly toward each other and to then insert the inner layers 86, 81 of the side fiap portions through the slots 82, 83 that divide said end flaps (Fig. 13) After this step and when the outer layers 84, 85 of the side flaps are flat against the end flaps 80, 8|, the box is inverted andthe partition of Fig. 14 is slid into the box from the open upper side thereof. The double layered partition slips into slots 88, 89 of the inner fiap layers 89, 81 and said layers themselves extend through slots I03, I08 that space the projections I00, IOI at one side of the partition and I05, I06 at the other side. The inner flap layers 86, 81 are then folded oppositely outwardly and over the projections I00, I and IIII, I 06 and over the halves of the end flaps, thereby locking the partition. These portions lie between crease H2 and creases III and lit respectively.

Above portions H5, H8 are projections III, III separated from each other by a slot II9 that is in upward extension of crease II2, while below portions III, II6 are similar projections I20, I2I that are separated from each other by slot I22 that is in downward extension of crease II2. Parallel creases I23, I24 define the junctures between projections II'I, H8 and the portions III, H8 and between projections I20, I2I and said portions.

These projections correspond to projections 93 to 96 in Fig. 14 in both structure and function, as they extend oppositely from the partition to the opposite end walls of the box when the partition is in the box.

Adjoining the creases III and II 3 respectively at the opposite sides thereof from portions 5,

H8 are projections I25, I26 that are divided by slots I21, I28 respectively. These projections are adapted to extend from the partition to opposite ends of the box and over the closure flaps-88, 8| that are carried by the ends of the the partition and end fiaps between the inner layers 86, 81 and outer layers 84, 85 of the bottom closure flaps that are in extension of sides I0, I I. V

The projections I00, IOI at one side of the partition, and projections I05, I06 at the other side are preferably of sufiicient length to extend to substantially meeting relation with the end flaps 80, 8|, while the side projections 93, 94 and 95, 96 are of sufiicient length to extend to the end walls of the box, thereby providing the inner layer of double thickness side walls (Fig. 15).

The weight of the contents of the box is transferred to the partition and from thence to the junctures between the bottom closure fiaps 84, 85 with side walls 10, II in substantially the same manner as already described with reference to the box of Figs. 1 to 9b.

Figs. 1a, 17

The form of the invention as illustrated in Figs. 16, 17 employs the same box as is formed from the blank of Fig. 10 but the partition formed box, while the closure flaps 86, 81 are adapted to be extended through slots I21, I28 and to then be folded over the portions of the projections I25, I26 that are at opposite sides of said slots.

The extensions I29, I30 that respectively adjoin creases H0, H4 and that form the end por- 'tions of the blank of Fig. 16, are adapted to lie against and to cover the inner sides of the end walls 68, 69 of the box formed from the blank of Fig. 10, when the projections I25, I28 are held against the bottom closure flaps.

Thus it will be seen that a double walled box is formed in which the load adjoining the partition is taken by the latter in the same manner as described for the preceding figures, but the partition provides the inner layers for both the end and side walls and also forms an additional layer for the bottom.

Figs. 18 to 21 inclusive The invention thus far described employs a, box in, which the bottom closure flaps are provided with means cooperating with the partition for holding the latter in the box. In the invention of Figs. 18 to 21 a conventional box, such as indicated in tubular, outfolded condition in Fig. 20 is used. Suchbox merely provides similar closure flaps at the top and bottom, there being similar end fiaps I3I, I32 on each end I33 of the box, top and bottom, and similar side flaps I34, I35 on each side I36, of the box, top and bottom. The end bottom flaps are first folded inwardly toward each other at right angles to the ends and then the bottom closure flaps I35 are folded over and below the flaps I32 and are either glued or stapled to the flaps I32, or are taped in closed position or are secured closed in any suitable manner.

The partition for this box may be formed from the blank of Fig. 18 that corresponds in every respect with the blank of Fig. 16 except that the slots I21, I28 are not required inasmuchas each of the bottom flaps I35 is single. Similar numbers are used to identify the elements that are identical with those of Fig. 16 and the unslotted projections I31, I38 in the blank of Fig. 18 correspond with projections I25, I26 of the blank of Fig. 16 except for the slots.

In this form of the invention the projections I31, I38 are imperforate thus providing an unbroken, smooth bottom in the box and a substantial portion of the load in the box will be taken by the partition and transferred to the 'side walls and bottom flaps atthe juncture between said side walls and flaps 135. The partition is not locked in the box, as in the case of the other forms of the invention, but it is clear that the bottom of the box will not bulge outwardly nor will the side walls.

It is to be understood that the invention as disclosed in the drawings and as described herein is merely illustrative of the invention and is not intended to be restrictive thereof.

I claim:

1. A box comprising a pair of spaced opposed side walls and spaced opposed end walls, a bottom comprising a pair of flaps respectively formed integrally with said side walls, a partition extending between said side walls, a pair of spaced projections on said partition extending outwardly from each side thereof toward the end wall facing each such side arranged to provide a pair of oppositely outwardly extending projections in engagement with each of said flaps and a pairof extensions on each of said flaps overlying each flap and overlying the said projections in engagement with each flap.

2. A rectangular box folded from a single blank comprising a pair of opposed side walls and a pair of opposed end walls and a bottom, each of said side walls and end walls being a double layer of the material of said blank and said bottom comprising extensions of the layers of material forming each of said side walls and end walls forming a folding flap on each side wall and end wall, said extensions being integrally connected at their edges that are remote from the said side walls and end walls, a partition extending between said side walls having means therein secured between the said extensions formed on said side walls.

3. A rectangular box folded from a single blank comprising a pair of opposed side walls and a pair of opposed end walls and a bottom, each of said side walls and end walls being a double layer of the material of said blank and said bottom comprising extensions of the layers of material forming each of said side walls and end walls forming a folding flap on each side wall and end wall, said extensions being integrally connected at their edges that are remote from the said side walls and end walls, a partition extending between said side walls having oppositely outwardly extending projections therein disposed between the said extensions formed on said side walls.

4. A rectangular box folded from a single blank comprising a pair of opposed side walls and a pair of opposed end walls and a bottom, each of said side walls and end walls being a double layer of the material of said blank and said bottom comprising extensions of the layers of material forming each of said side walls and end walls forming a folding flap on each side wall and end wall, said extensions being integrally connected at their edges that are remote from the said side walls and end walls, a partition extending between said side walls having oppositely outwardly extending projections thereon disposed between the said extensions formed on said side walls and the said folding flaps on, said end walls being also positioned between said last mentioned extensions.

5. A rectangular box folded from a single blank comprising a pair of opposed side walls and a pair of opposed end walls and a bottom, each of said side walls and end walls being a double layer of the material of said blank and said bottom comprising extensions of the layers of material forming each of said side walls and end walls forming a folding flap on each side wall and end wall, said extensions being integrally connected at their edges that are remote from the said side walls and end walls, a partition extendin between said side walls having projections thereon secured between the said extensions formed on said side walls, said partition comprising a single sheet of fiberboard folded on itself along a central fold line and said projections being extensions of said sheet along the edges thereof that are remote from said fold line.

6. A rectangular box folded from a single blank comprising a pair of opposed side walls and a pair of opposed end walls and a bottom, each of said s de walls and end walls being a double layer of the material of said blank and said bottom comprising extensions of the layers of material forming each of said side walls and end walls forming a folding flap on each side wall and end wall, said extensions being integrally connected at their edges that are remote from the said side walls and end walls, a partition extending between said side walls having oppositely outwardly extending projections thereon disposed between the said extensions that are formed on said side walls and said partition having other oppositely outwardly extending projections disposed between the layers forming each of said side walls.

KITCHENER K. NEWSOM.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,782,915 Weidner Nov. 25, 1930 1,799,656 Tinsley Apr. 7, 1931 1,815,565 Hill et al. July 21, 1931 1,962,492 Fallert June 12, 1934 2,007,697 Usher July 9, 1935 2,012,132 Koppelman et al. Aug. 20, 1935 2,297,982 Potts Oct. 8, 1942 2,342,564 Van Saun Feb. 22, 1944 2,344,999 Newsom Mar. 28, 1944

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