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Publication numberUS2884176 A
Publication typeGrant
Publication dateApr 28, 1959
Filing dateNov 2, 1953
Priority dateNov 2, 1953
Publication numberUS 2884176 A, US 2884176A, US-A-2884176, US2884176 A, US2884176A
InventorsHerbert L Carpenter, Jr Herbert L Carpenter
Original AssigneeGreif Bros Cooperage Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Closure assembly for fibre containers and method of making the same
US 2884176 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

April 28, 1959 H. 1 CARPENTER ET AL 2,884,175

cLoSURE ASSEMBLY Foa FIBRE CONTAINERS AND l METHOD 0E MAKING THE SAME Filed Nov. 2. 1953 5 Sheets-Sheet 1 JNVENToRs /zref/Z. far/denier By//zrerilfarmieg/: KM vom M Km,

l] TTOR/VEYS April 28, 1959 H CARPENTER ErAL 2,884,176

. CLOSURE SEMBLY FOR FIBRE CONTAINERS AND THOD OF MAKING THE SAME v 'S'Sheets-Sheet 2 Filed Nov. 2. 1953 ATTORNEYS April 28, 1959 H. L. CARPENTER ETAL 2,884,176

CLOSURE ASSEMBLY FOR FIBRE CONTAINERS AND METHOD 0F MAKING THE SAME Filed Nov. '2. 195s s sheets-sheet a l v I l l 4 INVENToRs fererL.Carpener andllererfll. Carpen eygffr.'

ATTORNEYS A CLOSURE ASSEMBLY FOR FIBRE CONTAINERS AND1METHOD OF MAKING THE SAME Herbert L. Carpenter, Amityville, and Herbert L. Carpenter, Jr., Lindenhurst, N.Y., assignors to The Greif Bros. Cooper-age Corporation, Delaware, Ohio, a corporation of Delaware Application November 2, 1953, Serial No. 389,731

4 Claims. 4(Cl. .H9-5.6)

This invention -relates to improved fibre drums and containers and more Aspecifically to improved top and bottom closure lassemblies of -fibre containers and to the method of making 'the same.

Fibre drums are made from convolutely wound laminated layers of kraft board, bre board or the like. They are generally provided lwith top and bottom closures in which the top closure is removable and the bottom closure is permanently secured in place. Fibre drums and containers are commonly used for the shipment and storage of bulk materials, raw materials, chemicals and the like. In practice, they are frequently subjected `to rough treatment and mishandling and are often dropped from relatively great heights, such as from the tailboards of trucks, while fully loaded, Under those circumstances, of course, the containers are subject to unusual impacts, stresses and strains, particularly in the area of the chimes and closure assemblies.

It is an object of lthe present invention to provide a libre container of the above type having improved top and bottom closure assemblies which can withstand the impacts, loads, -stressesand strains to which fibre containers are subjected, which is relatively simple and economical to manufacture and in which the top closure can be readily applied to and removed from the container but will nevertheless be firmly held in place when locked- In carrying out our invention we mold the libre at the two ends of the drum, while it is still fresh, moist and workable, into interlocked relationship with a metal reinforcing chime 'member Vand simultaneously complete the formation of an external groove and inturned bead in the reinforced drum body. Also, while the fibre is still fresh, moist and workable we mold the lower end of the drum into an inturned, rolled bead having interlocking relationship ywith the bottom closure thereby permanently and securely holding it in place so that it can withstand substantial impacts, loads, stresses and strains. The libre in the bead is in the form of a tightly compressed, cohesive, unitary mass and is encased in and protected by the metal reinforcing chime, which, along with the closure, is interlocked with the bead.

Other objects of the invention include thevprovision of an improved libre container of increased strength-particularly increased resistance'to puncturing-and also one in which attachment of the fibre parts in the container to metal parts is `improved so 'as to increase the strength thereof and to minimize the formation of condensate on the metal.

In the accompanying drawings:

Fig. 1 is an elevational view partially in section and with the centralyportion omitted of a fibre drum having top and bottom closure assemblies embodying our present invention and illustrating one specific type of bottom closure;

Fig. 2 is a detailed, sectional vview of the top closure assembly showing Athe relationship between the closure,

nited States Patent O v"ice 2,884,176 Patented Apr. 28, 1959 2 the 'locking rim and the chime portion of the container body;'

Fig. 3 is a similar view of va modified structure yembodying a gasket between the cover and the top of the container;

Fig. 4 is a similar cross-sectional view of the modified structure with the rim in vopen position and with the gasket expanded so as to elevate `the cover;

Fig. 5 is a detailed view in Vperspective of the two -end portions of the locking rim with the interconnecting locking link and lever showing the lever in open position;

Fig. 6 is a perspective view partially fragmentary with the locking lever in closed position and with a seal applied thereto;

Fig. 7 is a detailed view in section of a pair of dies and the upper chime portion of a container body showing one step in the production of the upper closure assembly with the dies illustrated in open position;

Fig. 8 is a similar view showing the dies in the process of being closed;

Fig. 9 is a similar View with the dies completely closed showing the upper chime portion of the container body when completed;

Fig. l0 is a detailed sectional view showing a pair of dies, the lower chime portion of the container body in inverted position and also one form of bottom closure which is to be assembled with the container illustrating the dies in open position;

Fig. l1 is a similar view -to Fig. l0 with the dies in partially closed position;

Fig. l2 is a similar view with the dies in completely closed position showing the bottom closure assembly in completed condition;

Fig. 13 is a detailed sectional view similar to Fig. k10 but showing a modified type of bottom closure; and

Fig. 14 is a view similar to Fig. 12 showing the modied type of bottom closure assembly -in completed condition.

In the accompanying drawings we have shown a fibre drum having a tubular body portion 15 which may be of any cross-sectional shape and which lis made in the usual manner from convolutely wound, laminated layers of kraft board, fibre board or the like. The body portion of fibre drums are usually made by winding a sheet of kraft board around a mandrel with suitable adhesives coating the surfaces of the board and permeating the pores and libres thereof. To increase the strength of the body portion, and also its resistance to leakage and puncturing, one or more of the convolutely wound layers may be made of a sheet metal, plastic, reinforced plastic instead of libre. For this purpose we may use a glass libre fabric layer impregnated and coated with a plastic material or a synthetic resin such as phenolic resin. This layer may be incorporated on either the inner or outer surface of the body wall, or at an intermediate position between the two surfaces. Materials of this type are much stronger than libre and increase the strength of the container.

The lower end of the fibre container is provided with a permanently attached closure 16 and the upper end with a removable cover or closure 17 whichV is releasably locked in place by means of a locking rim v18.

So as to strengthen the end portions of lthe drum, we provide a metal reinforcing chime or band around both the upper and lower ends of the drum body. Thus, around the upper end we provide the metal reinforcing chime 19 in the form of a strip of sheet'metal such as steel, which is tted tightly around the container body andV extends from a spaced distance below the upper end -upwardly and overlapping the top and projecting downwardly fora short distance into the interior of the drum as shown most clearly in Figs. 1-4 and 9. A short distance from the lgroove and rib as shown in Fig. 7.

upper end of the drum, the fiber body and the metal reinforcing chime are deformed inwardly so as to provide an external groove 20 and an internal rib or bead 21. It should be noted that the upper surface...of the groove and of the rib in the completed drum are preferably disposed at a sharp angle to the plane of the body of the drum forming a right angle shoulder, whereas, the lower surface of the groove and rib taper or curve gradually and merge with the drum body. The lower end of the metal reinforcing chime is preferably bent inwardly as shown at 22 so as to be rmly anchored in the drum body, thereby strengthening the connection between the parts and eliminating any sharp edges. Also, the metal reinforcing band may be secured to the fibre body by an adhesive or preferably by one of the new synthetic sealing or bonding agents. Where the sealing or bonding agents are employed the metal and fibre are securely sealed or bonded together in integral fashion with the sealing or bonding agent permeating the fibres. This greatly increases the strength of the structure and prevents condensation on the attached surface of the metal.

As shown most clearly in Figs. 1-4 and 9 the upper end of the fibre drum body is formed into a rounded bead 23 and the fibrous material in this bead is in compressed, molded, cohesive, unitary form and is relatively more compact than in the main portion of the drum body. The

vmetal reinforcing chime extends upwardly around the bead encasing and protecting it and it extends downwardly over the inner surface of the drum to a point near the internal rib 21.

In making the upper chime portion of the drum the metal reinforcing chime strip is tightly extended around the drum shortly after the drum body has been wound and before the adhesive has set so that the fibrous material of the body is still moist and workable. In this connection, the lower end of the metal chime strip is preferably deformed inwardly as shown in the drawings at the time of application so that it is embedded in the fibre body and an adhesive or bonding agent may be applied between the attached surfaces. The upper end of the chime strip overlaps the top of the body as shown in Fig. 7 but does not extend downwardly into contact with the inner surface. Thereafter, the external groove and internal bead may be preformed in the reinforced upper end of the drum as by suitable means such as rollers (not shown) providing a rounded, partially formed This operation is performed while the fibrous material is still in moist and vworkable condition and yprior to the setting of the adhesive.

When the groove and rib have thus been preformed and while the fibre is still moist and workable it is placed in a split die 24 having an inwardly projecting rib or flange 25 which fits into the partially formed groove in the drum. Projecting ange 25 has an upper surface providing a sharp shoulder with respect to the body of the die and a curved lower surface. In other words, it is formed in the desired shape of the completed groove and rib. A movable die 26 is also provided and it is adapted to move downwardly inside of the split die 24. Movable die 26 has a tapered cylindrical portion 27 cooperable to move downwardly into engagement with the inner surface of the rib 21 when the drum is assembled in die 24 thereby assuring that the rib will present a sealing surface of uniform diameter. It also is provided with a sharp shoulder 28 which is adapted to engage the upper surface of rib 21 and a rounded or concave peripheral portion 29 which is adapted to engage the upper end of thev drum body. v

After the partially formed drum is disposed in the split die 24, movable die 26 is moved downwardly in the manner shown in Fig. 7, 8 and 9. The first result is that the concave peripheral portion ofthe die engages the upper end ,of the container body vas shown in Fig.` 8 forming it into a rounded bead and curving the metal-reinforcing chime downwardly inside the drum. As the die 26 moves further downwardly to the position shown in Fig. 9 the rounded bead 23 is completed with the fibrous material compressed into more compact form and when the adhesive sets the fibrous material in the bead is a compact, molded, cohesive unitary mass. In addition, the metal reinforcing chime is curved downwardly and inwardly so as to encase and protect the chime.

Simultaneously, with this action, the shoulder 28 of die 26 engages the upper surface of the rib and through the combined action of the shoulder and of the concave peripheral portion of the die, the, groove and rib of the reinforced drum body are formed into the final shape with a right angle shoulder at the upper portion thereof and a gradually curved taper at the lower portion thereof. The removable head or closure 17 may be made of any desired material. The illustrated head is made of sheet metal such as steel and is in the form of a central disc-like portion having concentric reinforcing ribs 30 extending therearound. Immediately surrounding the ribs 30 is a U-shaped channel 31 which is of a size and shape to project into the drum and to be spaced inwardly from rib 21, as shown in Figs. 2, 3 and 4. Due to the shape of channel 31 it provides for a degree of resilience and for better shock resistance for the closure. Around the outside of the channel 31 is an outwardly projecting shoulder 32 which rests upon the upper surface of rib 21 forming a tight seal therewith. The peripheral portion of the closure is provided with a concave, inverted, U-shaped lportion which overlaps and is spaced from the upper end of the container. The concave portion is provided with a depending apron extending downwardly around the outer surface of the drum as shown at 34 in Fig. 2.

When the upper head or closure is assembled with the drum, the horizontal sealing portion 32 engages and seals against the upper surface of ribv21 while the concave portion 33 overlaps and is spaced from the upper en'd of the container and U-shaped channel 31 is spaced Anwardly from rib 21.

The inner surface of the head may be coated with a protecting material or a seal made of paper, plastic, rubber or the like may be extended over the inner surface thereof in the usual manner. Where a seal made of paper, plastic, rubber or the like is employed it may be free from connection with the inner surface of the head, or it may be secured thereto by a suitable adhesive or preferably one of the new synthetic sealing or bonding agents in the manner and with the results heretofore described.

The locking rim 18 serves to releasably lock the removable head 17 in place. The rim is in the form of a split ring extending almost completely around the upper end of the container and having an inturned lip or flange 35 along its upper edge overlapping the top of the head and an inturned channel portion 36 around its lower edge for engaging with groove 20 so as to hold the assembly locked and sealed in place. The channel portion 36 is slightly larger in dimension than the flange 35 so that when the rim is assembled around the drum and tightened and locked the channel 36 will first engage in the groove 20 and thereafter the flange 35 will engage against the curved surface 33 of the head performing a camming function and forcing the head downwardly.

Pivotally connected to one end of the rim is a link 37 which is pivoted at its opposite end to locking lever 3S. The locking lever 38 is in turn pivoted to the opposite end of rim 18. The free end of the locking lever is provided with a pair of spaced, projecting fingers 39 and with a locking detent 60 having a convex outer surface for frictionally engaging with the concave inner surface of the strap or loop 40 pressed outwardly from the surface of the locking rim 18. The lever is provided with a recess 41 so as to permit engagement with the loop Without obstruction from the end of the loop. When the leveris shifted to horizontal position so that detent 60 .engages with loop 40 there is .a Adefinite audible 'click indicating to the operator that the .lever has -been locked. The frictional engagement is such, however, that .the operator -can manually release the lever when desired.

When locking lever 38 is pivoted upwardly to the `posi- ,tion shown in Fig. 5, link 37 is shifted to the right thereby expanding the diameter of the locking rim so .that it can be assembled around or removed from the .end of .the drum. In applying kthe .rim it ris first assembled .around ythe drum with the channel 36projecting into groove 20. The lever 3S is then pivoted downwardly causing flange 35 to engage and overlap the head and force it downwardly to sealing position. The lower finger 39 of ,lever 38 is projected through .loop 40 vand .detent 60 is engaged with the loop so as to hold the lever in horizontal position. In addition, the pivotal connections between lever 38, link 37 and the ends of the locking rim `are such as to resist accidental opening. When the lever is disposed in horizontal locked position the pivotal connection 4Z between the lever and the end of the rim is offset upwardly with respect to the pivotal connections 43 and 44 .between the link and the rim, and the link and .the lever -respectively. Thus, with the end of the lever engaged with loop 40 any force tending to expand the rim yonly serves to lock the lever more tightly. However, by a .simple manipulation, the free end of the lever may be pivoted upwardly in the manner shown in Fig. 5 to release the rim. When the rim has thus been released it can be removed from the top of the drum so as to permit the removal of the head 17. Lever 38 i-s preferably provided with `a small loop 61 for receiving a sealing wire when .the lever is in locked position. Thus, as shown in Fig. 6 the sealing wire 62 may be extended through strap 40 andloop 61 and then engaged with a metal seal 63. It will vthus be seen that the drum cannot be opened without breaking the .seal which will clearly indicate that someone has tampered with the rim and closure.

In Figs. 3 and 4 I have shown a modified structure in which a `sealing ygasket 64 is provided between the upper end of the container body and the closure. The ,sealing gasket is made of a resilient, compressible sealingmaterial such as natural or synthetic rubber, neoprene, polyethylene or some other suitable plastic material. Itis in the form of a cross-sectionally oval or round ring positioned in the concave portion 33 of the closure and it is secured in place in the closure by means of a suitable adhesive preferably a synthetic sealing or bonding agent. When the head is placed on the top of the container and before the rim is constricted and closed the Agasket 64 serves to hold the head in elevated position as shown in Fig. 4. However, when the rim is constricted by pivotinglever 38 downwardly to horizontal position channel 36 ,first engages in the groove 20 and flange 35 will then engage the peripheral portion 33 of the head performing a camming `function pulling the head downwardly 4to sealing position and compressing and sealing the gasket as shown in Fig. 3. In this connection the .depending apron 34 around the outside of the closure is of lesser width than the rim 18 so that when the head is pulled downwardly to yclosed position the lower end of the apron does ,not engage with the channel portion 36 of the rim.

Referring now to the lower end of the container, it is provided with a metal reinforcing chime 45 rnade of sheet metal 4such as steel. The `reinforcing chime tightly embraces the drum and extends from a point spaced a short distance from the lower end downwardly overlapping the lower end and thence inwardly around the inner surface of the drum as shown most clearly in Figs. 1 and 12. A short distance from the lower end the reinforced chime portion is provided with an external groove 46 and an internal rib 47 corresponding to groove .and rib 20 and 21. Fig. l2 shows -the lower end of the drum in inverted form and Fig. l shows the entire drum vin .upright position. The lower surface of ,the groove and rib is in the form of a sharp vright angle shoulder, whereas --the upper surface curves in a :gradual 4taper vor radius lmerging lwith the drum body.

The extreme lower end of the reinforced container -wall is formed into an inturned -rolled bead 48. The fibre material in the bead 48 is in tightly compressed, molded, cohesive, unitary form and is relatively more compact `than the fibre in the main body of the container. The metal reinforcing chime extends completely around the outer surface of the .bead vso ras to protect and Vencase the fibre Iand as shown most clearly in Fig. 12, the inner end of the reinforcing chime extends inwardly linto the bead and is anchored therein. As inthe case of the metal reinforcing chime at the upper end of the container .the upper edge of the metal reinforcing chime 45 may be deformed inwardly and anchored in the fibre wall body as shown at 49. Also, the metal reinforcing chime may be secured in place by a suitable adhesive preferably a synthetic sealing or `bonding agent so as to increase the strength ofthe assembly.

The fixed head or closure at the lower end of the container may be made of any desired material. In the form shown in Figs. 1 and l0 to 12 inclusive, the closure 16 is made of sheet metal such as steel and has a seal 50 made of paper, plastic material, rubber or the like extending across the .inner surface thereof. Seal 50 may likewise be .secured in place by a suitable adhesive, preferably a sealing or bonding agent which will weld the parts together in a unitary structure.

The head is in the form of a disc disposed inside the lower end of the container in engagement with the internal rib 47. It is provided with a peripheral portion 51 which extends downwardly and is rolled into the bead as shown and is frictionally and adhesively anchored therein.

In assembling the lower chime portion of the container, the metal reinforcing ychime is applied as in the case of the upper end of the container by tightly extend- 'ing the metal strip around the container body while it is still moist and workable and before the adhesive has set, with .the lower end of the chime overlapping the lower end of the container in the manner shown in Fig. 10. Also, while the fibre s still moist and workable the external rib and groove 46 and 47 are preformed or partially 'formed therein in the approximate shape shown in Fig. l10 by any suitable means such as rollers. Then as shown in Figs. 10, 11 and 12 the drum is placed in inverted form into a split die 52 somewhat similar to the die 24 and having an inwardly projecting rib or flange 53 formed in the desired, finished .shape of the groove and rib. Thereafter, the head 16 together with its seal or lining 50 are inserted into the open lower end of the container vuntil they lrest in engagement with the partially formed rib 47 as shown in Fig. 10. vBoth the head and its seal have a depending apron-like peripheral portion as shown at 54 `which rests against the inner surface of the container between the rib and the open end. An adhesive, preferably a synthetic sealing or bonding agent, is applied to the contacting surfaces of the ycontainer and the apron-like peripheral portion 54 of the head.

Thereafter, a movable die 55 is inserted into the split die 52 and is moved downwardly in the manner shown in Figs. 1 1 and 12. The movable die 55 has a concave peripheral portion 56 which is shifted downwardly into engagement with the end of the reinforced container wall. The first effect of this movement is shown in Fig. 1l. The movable die causes the reinforced container wall to fold downwardly and inwardly upon itself with the metal reinforcing chime completely surrounding the folded over wall and with the peripheral apron portion 54 of the 'closure disposed between the two folded over layers of the wall. Shifting of the die 55 downwardly to the position shown in Fig. 12 causes further rolling of the inturned lower end of the reinforced container wall and further .compression thereof into the lrolled 'bead 48 with the peripheral edge of the vvhead extending :into Land .em-

7. bedded in the bead, as shown, and with the inner end of the metal reinforcing chime extending inwardly into the bead-first in contact with the disc portion of the closure and then in contact with the peripheral portion thereof.

All of this molding, forming and rolling operation is performed while the fibre is still moist and workable and before the adhesive has set. The fibre is thus molded and compressed while the bead is thus rolled. After the adhesive has set, the fibre is in the form of a compressed, molded, cohesive, unitary mass which is more compact form than the bre in the main body of the container. In addition the metal chime portion completely encases and protects the fibre in the bead and both the end of the metal reinforcing chime and the peripheral edge of the closure are rolled into the bead being embedded therein and being frictionally and adhesively secured in place. In this connection, I have found that the adhesive connection or bonding is improved by first coating the inner surface of the container between the rib and the lower end thereof with a suitable adhesive or preferably a synthetic sealing or bonding agent before inserting the closure to the position shown in Fig. 10. The inturned rolled bead 48 tightly presses against the closure and in turn presses the closure against rib 47 and that it is the metal reinforcing chime which presses against the outer surface of the closure. This provides a strong, reinforced structure with the closure tightly and permanently embedded therein. Where a sealing or bonding agent is employed the fibre seal and metal are bonded or welded into a unitary structure of greater strength with the bonding agent penetrating and impregnating the fibres. Also, as pointed out above the bonding agent prevents the formation of a condensate along the attached surface of the metal.

As previously stated, the lower closure may be made of any desired material. The closure 16 described above is made of metal. In Figs. 13 and 14 we have shown a closure made of non-metallic material and it should be understood that the closure may be made of any desired material such as fibreboard, wood, plywood, plastic, reinforced Ilastic, or the like. If preferred, the closure may be made of laminated layers of different material such as one or more layers of fibre laminated to one or more layers of reinforced plastic material.

Referring to Fig. 13, we have shown the inverted lower end of the drum positioned in split die 52 which is similar to the die shown in Fig. 10. A closure 57 made of a plurality of layers of non-metallic material is shown as positioned in the open lower end of the container body and resting against the rib 47. The closure has a body portion in the form of a disc made of a plurality of layers of non-metallic material and also has a peripheral apron or flange portion 58 of reduced thickness which may be made of only one layer of non-metallic material. One or more of the layers may be made of fibre, such as kraft paper, and another of the layers may be made of a reinforced plastic, such as Woven glass bre impregnated and coated under pressure with a synthetic resin or plastic, for instance phenolic resin forming, in effect, a reinforced plastic tray. This greatly increases the strength of the closure, particularly its resistance to puncturing. The inner surface of the container between the rib and the lower end may be coated with an adhesive, preferably a synthetic sealing or bonding agent, before inserting the bre head. Under any circumstances, the operation of securing the head in place is performed while the fibre in the container body is still moist and workable and before the adhesive has set.

When the die is brought downwardly the same sequence of events take place as shown in Figs. 11 and 12, until finally as shown in Fig. 14 the movable die 55 has been shifted all the Way downwardly providing an inturned rolled bead 48, with the peripheral edge portion 58 of the closure and the inner end of the metal reinforcing chime extending into the bead and frictionally anchored therein and bonded thereto by the synthetic sealing or bonding agent to form a unitary structure. The fibre in the bead is molded and compressed in the forming operation and after the adhesive or sealing or bonding compound has set it is in the form of a compressed, molded, cohesive, unitary mass which is relatively more compact than the bre in the body portion of the drum. The sealing or bonding compound impregnates and permeates the fibres and bonds the closure to the body of the drum so as to provide, in effect, the welded or unitary lstructure. In addition, the bead is pressed downwardly against the periphery of the main portion of the closure 57 tightly engaging it and pressing it against the rib 47 and com.- pressing it in tapered form as shown at 59.

Our improved fibre container is used in the usual manner. It may be lined with any desired type of protective coating material. When it has been filled with the bulk material, chemicals, food products or the like, the removable closure 17 is applied thereto, the locking rim 18 assembled therearound and locking lever 38 pivoted downwardly until detent 60 is engaged with the loop 40 thereby releasably locking the assembled rim and closure in place. The cover will not now .accidentally open. However, it may be readily opened Iby manually releasing detent 60 from engagement with loop 40 and shifting the lever upwardly so as to cause link 37 to expand the rim. In this connection, the link can Ishift upwardly without interference from the reinforced chime portion of the drum since it has no anges projecting therefrom.

Our improved container is relatively simple to manufacture .and is of great strength due to the metal reinforcing chimes and due to the manner in which the fibre is beaded, molded and compressed at the two ends forming a compact, molded, cohesive, unitary fibre mass encased and protected by the metal reinforcing chime and with the peripheral edge of the lower closure embedded, therein. The strength is increased by the bonded connection between the parts, particularly between the metallic `and non-metallic parts resulting from the use of the sealing or bonding agent. This also eliminates undesirable sweating or condensating along the 'bound surface of the metal.

Modifications may be made in the illustrated and described embodiments of our invention without departing from the invention as set forth in the accompanying claims.

We claim:

1. A fibre container assembly comprising: .a tubular body made of convolutely wound, laminated layers of fibreboard; a metal reinforcing chime disposed around the tubular fibre body at one end thereof, said body and reinforcing metal chime being formed into an external groove and an internal shoulder extending completely around the container la short distance from the end thereof; a closure disposed in the reinforced end of the body and abutting against said internal shoulder; said tubular bre body and said reinforcing metal chime, beyond said shoulder, being curved inwardly and formed into an inturned rolled bead rolled inwardly upon itself for more than one complete turn, the curve of said inturned 'bead starting substantially at said shoulder, and being continuous such that the metal reinforcing chime forms a terminal bead at the end of the container the end portion of which is substantially 'semi-circular in cross-section, said closure having its peripheral edge interlocked with said inturned bead, the interlocking of said edge with said inturned bead being further secured by an adhesive bonding agent within said inturned bead, the fibre material in said inturned rolled bead being in the form of a tightly-compressed, molded, cohesive, unitary mass with the metal reinforcing chime being disposed completely around the outer surface of the inturned rolled bead so as to protect and encase the fibre material therein, and said metal reinforcing chime being in engagement with the closure and extending inwardly into said inturned' 9 rolled bead in contact with a portion of the peripheral edge of the closure.

2. The invention in accordance with claim 1 wherein said `body and said closure include at least one layer of reinforced plastic material laminated between 'layers of the iibreboard.

3. The method of making a fibre drum assembly which comprises rst, providing a tubular 'body made of convolutely wound adhesively laminated layers of breboard with the adhesive and libre still moist and workable and with a metal reinforcing chime surrounding the body ad* jacent one end thereof and overlapping said end, :said tubular body and said reinforcing chime being formed into an external groove and internal shoulder spaced inwardly from said end, that part of the metal reinforced tubular body outwardly of said shoulder being the bead forming portion of the body, further providing a closure having a periphenal apron adapted to be disposed in engaging relationship with the inner surface of the body immediately adjacent said end and spaced from the outer periphery of said end; applying an adhesive bonding agent to surfaces to be in engaging relationship of at least one of said inner surfaces of the tubular body and the peripheral apron of the closure, then inserting Vsaid closure into said end of the body with said closure resting upon said shoulder and with the peripheral apron disposed in engaging relationship with the inner surface of said bead forming portion of the ybody immediately adjacent said end, the length of said apron being not greater than one-half of the length of the bead forming portion, next while the fibre is still moist and workable folding the reinforced end of said body inwardly upon itself and over the inner surface of the apron and rolling the folded reinforced end of said -body with the peripheral apron disposed therebetween inwardly under compressive force into engagement with said closure so as to provide an inturned rolled bead rolled inwardly upon itself for more than one complete turn to interlock the apron of said closure with the reinforced end of said tubular body with the fibre material within said bead in compressed, molded, compact form and With the metal reinforcing chime encasing and protecting the fibre material in said rolled bead with closure secured within said bead by said bonding agent, with the peripheral end of the reinforcing chime anchored in the rolled bead, and with the roll of said bead starting substantailly at said shoulder land being continuous such that the metal reinforcing chime forms a terminal bead at the end of the container the end portion of which is substantially semicircular in cross-section, ,and finally drying the bre and adhesive so that the fibre is formed into a compact, molded, cohesive, unitary mass.

4. The invention in accordance with claim 3 wherein said body and said closure include at least one layer of reinforced plastic material laminated between layers of the ibreboard.

References Cited in the le of this patent UNITED STATES PATENTS 732,862 Jones July 7, 1903 1,597,889 Hulbert Aug. 31, 1926 2,023,937 Rollason Dec. 10, 1935 2,040,779 Norwood May 12, 1936 2,307,923 Eggerss lan. 12, 1943 2,334,041 Scott Nov. 9, 1943 2,336,540 Graves Dec. 14, 1943 2,349,730 Horning May 23, 1944 2,417,586 Crosley Mar. 18, 1947 2,461,539 Fletcher Feb. 15, 1949 2,547,395 Jansen Apr. 3, 1951 2,555,700 ONeil June 5, 1951 2,579,974 Scott et al Dec. 25, 1951 2,676,127 Hansen Apr. 20, 1954 2,696,340 Bergstrom Dec. 7, 1954 2,727,673 Bergstrom Dec. 20, 1955 FOREIGN PATENTS 151,677 Australia June 1, 1953

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AU151677B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2944714 *Nov 22, 1957Jul 12, 1960Mauser KgQuadrangular receptacle structures
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Classifications
U.S. Classification229/5.6, 493/103, 229/5.7, 292/256.69
International ClassificationB31B17/00
Cooperative ClassificationB65D15/06, B31B1/60, B31B17/00, B31B2217/082, B31B2201/60
European ClassificationB31B1/60, B31B17/00, B65D15/06