US3001683A - Paper container - Google Patents

Description

p 26, 1961 c. w. GOODWIN ETAL 3,001,683

PAPER CONTAINER 4 Sheets-Sheet 1 Filed Jan. 23, 1959 [Illllllllllill- INVENTORS CARL 01/. oaaw/M JDH/V R CA/fP/l/Vf-LL/ Sept. 26, 1961 c. w. GOODWIN ETAL 3,001,683

PAPER CONTAINER Filed Jan. 23, 1959 4 Sheets-Sheet 2 5W N A 4 R 1 h I AN Sept. 26, 1961 c. w. GOODWIN ETAL 3,001,683

PAPER CONTAINER Filed Jan. 25, 1959 4 Sheets-Sheet 3 nu l W W I I INVENTORS CARL 14/ GOUDWM/ JaHA/ (Ar/PANEL p 1961 c. w. GOODWIN ETAL 3,001,683

PAPER CONTAINER 4 Sheets-Sheet 4 Filed Jan. 23, 1959 INVENTORS CARL 14/ 6000140 CAMPA/VELL/ g y Em Patented Sept. 26, 1961 1 ice 3,001,683 PAPER CONTAINER Carl W. Goodwin, North Plainfield, N.J., and John P.

Campanelli, Levittown, N.Y., asignors to American Seal-Kap Corporation of Delaware, New York, N.Y.,

a corporation of Delaware Filed Jan. 23, 1959, Ser. No. 788,568 2 Claims. (Cl. 229-25) This invention relates to what is generally known as a paper receptacle or container and to the method of producing the same from a single blank.

In accordance with the present invention the receptacle is formed from a single blank and comprises a bottom wall and an upwardly and slightly outwardly flaring annular side wall, integral with the bottom wall, which is of uniform thickness circumferentially and progressively increases in thickness upwardly from the bottom wall to the upper end of the side wall. The upper end of the side wall terminates in an enlarged annular head which is also integral with the bottom and side walls.

in producing the receptacle a blank of predetermined size and shape, depending on the side and shape of the receptacle to be formed, is first stamped from a sheet of paper stock. The stamped blank is then suitably treated in accordance with the intended use of the receptacle. One such method of treating the blank is disclosed in the patent to Baum, No. 1,668,349, issued May 1, 1928. Another method of treating the blank is to laminate it with suitable ductile metal or plastic material.

The treated blank is then drawn down into a cup shaped die member by a complementary plunger. As the blank is drawn down into the die member the wall forming portion thereof is gathered into contiguous pleats of corrugations having hill and dale sections which progressively increase in width and depth from the bottom wall section to the upper end of the side wall section. After the blwk has been drawn down and gathered into the die member by the plunger, continued downward movement of the plunger exerts a lateral pressure in the order of 8,000 to 10,000 pounds per square inch upon the side wall section which reduces it to a substantially homogeneous, dense structure with the fibrous material of the pleats or corrugations felted together. A heavy downward pressure is then applied to the upper end of the wall section which further compacts it and forms the annular bead about the upper end of the side wall section. The progressive greater amount of gathered stock in the skirt section, upwardly from the bottom section, which is compacted during the forming operation causes the wall section of a finished receptacle to progressively increase in thickness from the bottom wall section upwardly to the upper end of the side wall section.

An apparatus by which the receptacle may be formed consists of a lower die mechanism, which is adapted to be secured in stationary fixed position on the bed of a stamping press, and an upper die mechanism which is adapted to be secured to the ram of the press for vertical reciprocation therewith. The lower die mechanism comprises an upwardly and outwardly flowing cup shaped die having a draw ring disposed in fixed position about the upper end thereof. The upper surface of the draw ring is provided with radially extending contiguous grooves which progressively decrease in depth and width from the inner edge of the draw ring to the outer edge thereof. The upper die mechanism comprises a spring loaded blank holder by which the skirt section of a blank to be for-med into a receptacle is yieldingly clamped between the draw ring and the blank holder, and a complementary cooperating plunger by which a blank is withdrawn from b w n t e awn t ns and t e bla hslds an d awn down into the cup shaped die and is initially compressed and compacted therein. The grooved draw ring and the cooperating blank holder are operative to gather the skirt section of the blank into contiguous corrugations which progressively increase in depth and width outwardly of the blank from the central section to the periphery of the skirt section as the skirt section is being withdrawn from between the draw ring and the cooperating blank holder by the plunger, down into said cup shaped die. The final downward movement of the plunger, as previously stated, compresses and compacts the corrugated skirt section of the blank.

A tubular plunger is disposed about the main plunger, which after the main plunger bottoms in the die, continues on downwardly into engagement with the upper end of the skirt section and further compresses and compacts it and interfelts the fibers thereof into a homogeneous, dense structure, and forms the enlarged annular bead about the skirt section.

The principal object of the invention is to provide a new and improved receptacle, having a bottom wall and an integral upwardly extending side wall, which is formed from a single suitably treated paper blank.

Another object of the invention is to provide a single and efficient method of producing receptacles of the aforesaid character.

Another object of the invention is to provide a receptacle of the aforesaid character is which a printed legend appearing on the side wall of the finished receptacle is printed on the skirt section of the blank from which the receptacle is formed in such distorted form that it appear in proper form on the side wall of the receptacle after the receptacle has been completely formed in accordance with the method described and claimed herein.

Having stated the principal objects of the invention other and more limited objects thereof will be apparent from the following specification and the accompanying drawing forming a part thereof, in which:

FIG. 1 is a perspective view of a paper receptacle constructed in accordance with the present invention;

FIG. 2 is an enlarged central vertical section through the receptacle shown in FIG. 1;

FIG. 3 is a plan view of the blank from which the receptacle shown in FIGS. 1 and 2 is formed;

Fig. 4 is a central vertical section through the receptacle forming apparatus showing the plunger and blank holder being moved downwardly, and just prior to their" engagement with a blank to be formed which is disposed on the draw ring;

FIG. 5 is a view similar to FIG. 4 showing the various parts of the apparatus in the relative positions they assume at the end of the forming stroke, and showing a completely formed receptacle therein;

FIG. 6 is a fragmentary top plan view of the cup shaped die and the associated draw ring, showing the contiguous radially extending V-shaped grooves, in the upper surface of the draw ring, which progressively decrease in depth and width from the inner edge of the draw ring to the FIG, 10 is a view similar to FIGS. 8 and 9 showing the 3 blank still further withdrawn from between the draw ring and the blank holder down into the die;

FIG. 11 is a view similar to FIGS. 8 to 10 showing the blank completely withdrawn from between the draw ring and blank holder down into the die, and the corrugations in the skirt section partially compressed and compacted between the main plunger and the die;

FIG. 12is a view similar to FIGS. 8 to 11 showing the main and bead forming plungers at the limit of their downward strokes after having completely formed the reeep tacle, as shown therein and in FIGS. 1 and 2;

FIGS. 13 and 14 are fragmentary detail sectional views, taken respectively on the lines 1313 and I414' onFIG. 9', showing the manner in which the skirt section of the blank is gathered into contiguous corrugations as it is withdrawn from between the draw ring and blank holder;

FIG. 15 is a detail sectional view taken on the line 15- 15 of FIG. 10 showing the maximum depth and width of V the skirt corrugations at the periphery of the skirt, just as the skirt leaves the draw ring and blank holder;

FIG. 16 is a fragmentary side elevation of the skirt sec tion in the condition shown in FIG. 10; 7

FIGS. 17 and 18 are fragmentary horizontal detail sections through the skirt section as shown in FIGS. 10 and 16 showing the manner in which the corrugations progressively increase in depth and width from the bottom section outwardly, the planes of the sections being indicated respectively by the lines 1717 and 1818. on FIG. 16; and

FIG. 19 is a detail horizontal section taken on the line 19- 19 on FIG. 12 showing the skirt section compressed and compacted, and the fibers thereof interfelted intoa homogeneous, dense structure.

Referring now to the drawings in detail by reference characters, the numeral 1 indicates a cup shaped receptacle, embodying my invention, which is produced in accordance with the method disclosed and claimed. herein. The receptacle 1 comprises a bottom wall 2 and an integral upwardly. extending outwardly flaring annular side wall 3 which terminates in: an enlarged annular integral compacted polished bead 4' about the upper end thereof, and progressively increases in thickness from the bottom wall 2 upwardly to the bead 4. as clearly shown in FIGS. 2, 5 and 12. The receptacle 1 is formed from a single blank 5. having a central section 6, from which the bottom Wall 2 is formed, and an annular skirtsection 7, from which the annular side wall 3 and bead 4; are formed. The blank, which is stamped from a sheet of suitable stock, is first suitably treated in accordance with the intended use-of the receptacle, after which it is formed into the receptacle.

The apparatus by which the treated blank 5 is formed into the receptacle 1 comprises a lower die mechanism 10, which is secured in fixed stationary position in the bed 11 of a conventional stamping press, and a cooperating upper die mechanism 12, which is secured to the rarn 14 of the press, for vertical reciprocation therewith.

The lower die mechanism 1% comprises a cup shaped die 23 having an upwardly extending outwardly flaring lower inner wall 24 which terminates in an offset straight cylindrical wall 25. A draw ring 27 is suitably secured about the upper endpof the die' 23' with the inner edge 28 thereof disposed in substantial alignment with the upper cylindrical wall 25 of the die member 23. The upper surface of the draw ring 27 is provided with contiguous V-shaped radially extending grooves 29. which progressively decrease in depth and width from the inner edge 28 thereof to the outer edge'3i) thereof-1 A sleeve-like compression and bead forming plunger 65 which is disposed about the straight cylindrical section 53' of the main plunger 51 is removably secured to the lower end of the holder 40 by a retaining ring 66 and cap screws 67. A ring shaped blank holder 68 is secured to the lower ends ofaplurality of rods 69 having heads 70 which are slidably mounted in complementary vertical bores-71 in the, holder 40;. Springs 72 in the bores 71 yieldingly hold the blank holder 68 in its lowermost position, as shown in FIG. 4, the heads 70 onthe rods 69 serving to limit the downward movement of the blank holder 68 under the influence of the springs 72. The inner edge 73 of the blank holder 68 is disposed in verti cal alignment with the inner edge 23- of the draw ring ring 27, coaxially therewith, while the press ram 14 and the upper die mechanism 12 carried thereby are in their uppermost position. On the downward movement of the ram the central section 6 of the blank will first be engaged by the plunger 51 and skirt section 7- of the blank will be yieldingly gripped between the draw ring 27 and the blank holder 68 as shown in FIG. 8. As the main plunger 51 is moved on down, by the ram, through the positions shown in FIGS. 8 to 11, the blank holder will remain stationary, gripping the skirt 7 between it and the drawn ring with a predetermined pressure as determined by the springs 72. During this downward movement of the plunger 51 the central section 6- of the blank willbe moved straight downwardly into the die 23 and compressed against the bottom wall 34 thereof, thus forming the bottom 2 of the receptacle. At the same time the skirt section 7 of the blank will be withdrawn from between the draw ring 27 and the blank holder 68 down into the die 23 between the inner wall 24 thereof and the outer wall 52 of the plunger 51', thus forming the annular side wall 3 of the receptacle.

Asthe skirtsection 7 of the blank 5' is drawn from between the draw ring 27 and blank holder 68 down into. the die 23, the grooves 29 of the draw ring 27 gather the skirt section into radially extending contiguous corrugations 75 which progressively increase in depth and width, as clearly shown in FIGS. 13 to 18, from the bot tom section 6 outwardly to the periphery of the skirt section, 7. This. increase in depth and width of the corrugations 75. is due to the fact that the closer to the periphery' of the skirt 7 the greater the amount of skirt stock that must be gathered as the skirt section 7 of the blank 5 is formed upwardly about the. central section 6 thereof. This also accounts for the annular side wall 30f the receptacle 1 progressively increasing in thickness upwardly from the bottom wall 2 thereof. As the plunger 51 is. moved on down from the position shown in FIG. 10 to the position shown in FIG. 11, the corrugations 75 are initially compressed and compacted between the tapered outer wall 52 of the plunger 51* and the tapered inner wall 24 of the die 23. I

After the main plunger 51 bottoms, asshown in FiG.

, 11-, it will remain stationary while the ram-'14 continues to move the holder 4% and the sleeve-like compression and bead forming plunger 65 secured thereto ondown from the position shown in FIG. 11 to the position shown in FIGS. 5 and 12. During this further downward movement' of the-plunger 65 it engages the upper edge of the skirt secti'on7 and compresses and. compacts it from the position. shown in FIG. 11 to the. position-shown in FIG. 12, thus' forming the compacted polishedbead 4 of the receptacle 1. 7 At the same time it furthercompressesand compactsthe corrugated section of the skirt between the plunger and diewalls 52 and 24 respectively into a homogeneous, dense structurewith the fibers thereof interfeltedtogether.

As-the plunger 51 is moved upwardly from the position.

5 shown in FIG. 12 to the position shown in FIG. 8, the finished receptacle is stripped from the plunger 52 and ejected from the cup shaped die 23.

When it is desired to have a legend printed on the side wall 3 of the container, as indicated at 80 in FIG. 1, the legend is printed on the skirt section 7 of the blank 5, before the container is formed, in such distorted form as shown at 81 in FIG. 3, that it appears in proper form on the side of the container after the container has been formed.

Having thus described my invention, it will be evident to those skilled in the art, that various changes and modifications may be made therein within the spirit of the invention and the scope of the appended claims.

We claim:

1. A paper receptacle formed from a single treated blank and comprising a bottom wall, an upwardly extending annular side wall integral with said bottom wall, said side wall comprising upwardly extending contiguous corrugations which progressively increase in depth upwardly from said bottom wall, said corrugations being in the compressed, compacted and interfelted state and forming an annular wall having a dense, rigid structure which progressively increases in thickness upwardly from said bottom wall and terminates in an integral outwardly extending annular flange having an integral upwardly extending annular bead disposed about the outer rim thereof thereby providing a smooth flat annular shoulder between the upper end of said side wall and said up wardly extending annular head.

2. A paper receptacle as set forth in claim 1 in which said blank is impregnated with wax and in which said wax constitutes a bonding agent for bonding said interfelted corrugations into a substantially uniform wall structure.

References Cited in the file of this patent UNITED STATES PATENTS 1,435,149 Carle NOV. 14, 1922 1,966,469 7 Taylor July 17, 1934 2,393,347 Stuart Ian. 22, 1946 2,629,533 Chaplin Feb. 24, 1953 2,814,427 Emery Nov. 26, 1957 FOREIGN PATENTS 7,305 Denmark Feb. 20, 1905

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