US 1771765 A
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July 29, 192.0. E, BENg N 1,771,765
WATERPROOF PAPER RECEPTACLE Filed Jail. 24, 1925 h iilliazaEfla'uou a lie/newly! Patented July 29, 1930 g UNITED STATES PATENT OFFICE WILLIAM E. BENSON, or W LMINGTON, MASSACHUSETTS, essreNoR 'roixa'mx our COMPANY, or BOSTON, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS WATERPROQF PAPER RECEPTACLE Application filed January 24, 1925. Serial N6. 4,485.
one and cups otherwise reasonably satisface tory for handling cold liquid are usually found utterly useless from a practical, point of view when used with a hot liquid. This is duein part to the action of the heat in softening the cement or parafiin or other material used in the manufacture of the cup, and in part to the thinness of the paper wall both in the action of the heat on the paper itself and on the conductivity of the wall which makes it diflicult to directly contact with the wall when filled with a hot beverage.
Various attempts have been made to overcome these difliculties and to produce a satisfactory commercial article which would be available at a price consistent with the class of usage to which such article is put. One of the attempted solutions of this problem has been the provision of a sheath or external reinforcement which added to'the strength of .so the wall and provided insulation. Such cups, however, have never, as far as I have been advised, been so constructed that then seams, and particularly their bottom seams" would withstand the high temperatures inci- 5 dent to the problem.
Whereparafiin was used the effects of'the temperature were immediately to soften up theseams and cause leakage. Even the usual cemented seams gave way after being sub- 40 jected to heat for a short time.
In accordance with my invention I provide by a simple combination of elements, involving in part the principles of my previous in- "vention' set'forth in application Serial No. 748,516, filed November 8, 1924, by which I secure an additional efl'ect along the lines indicated as desired.
Such a structure I have illustrated in the accompanying drawings a cup in accordance with my invention, to which reference being employed throughout to indicate corresponding parts. In these drawings ig. 1 is a side elevation of a cup in accordance with my inventiomthe outer sleeve being partly broken away to how the bottom of the cup above the bottom of the sleeve.
Fig. 2 a central vertical section through a modified form of cup.
Fig. 3 a transverse section looking into the cup, and i Fig. 4 a vertical Section of a modified form.
In accordance with my invention I provide for a cup as in my previous invention, formed wit-h a side wall member 1, of general ly flaring character, having the bottom edge of its wall upturnable inwardly to form an inwardly flaring flange 1' on which to maintain a bottom. piece 2 having a correspondingly downturned flange 2 surrounding a central portion. The downturned flange of the bottom portion 2 is cemented to the upturned flange 1' of the wall portion, the two being disposed at an angle to the vertical axis of the cup as' discussed in my prior application. As set forth therein this-leaves an annular channel about the bottom portion of the cup surrounding the slightly raised bottom which is of the form of a truncated cone, the wall of which flares inwardly at substantially the same angle of flare as the outer wall. The seam formed between the flange 2 and the flange 1 being a glued or cemented seam is one of'the most critical features in paper cups of this type. In accordance with my invention this seam is formed under pressure so that a very complete union of the two flanges is obtained. The character of this union under pressure makes the seam capable of withstanding hot liquids against which the ordinary uncompressed seam has formed only walls of the cup while at the same time pro-- a slight barrier. This matter of compression of this scam is therefore while not in itself the subject matter of an independent claim in the present invention, isa deciding factor in the insulated cup as adapted to hot liquids.
Surrounding the outer wall I provide a sleeve member 3 of paper stock preferably of somewhat heavier .and unsized material which may be of greater diameter than the wall of the cup itself and'crimped vertically to form a series of corrugations. The corrugating of such sheath or insulating member reduces it to the diameter of the containing member of the cup which is then externally coated with adhesive and the sleeve slipped about it. 4
These corrugations greatly stiffen the viding insulating spaces and affording vertical ventilation between the Walls of the container and the sheath. Such an external sleeve whether of the corrugated type shown in Fig. 1, or the plain types shown in Fig. 2 and Fig. 4 may be extended beyond the bottom of the cup proper. In Fig. 2 the sleeve 3 is shown extended below the bottom of the cup as at 3 In actual practice the sleeve member 3 may be made substantially cylindrical as from a straight strip of corrugated stock. When the sleeve 3 is slipped over the cup wall 1 in view of the comparatively slight taper of the cup and the large area of the corrugations, the upper portion of the corrugated sleeve will expand to conform to the cup; This sleeve need not be of very heavy stock as the air spaces aflord suflicient insulation and because the preferable cementing of the inner folds of the corrugation to the outside of the cup wall 1 makes of the assembly a reinforced corrugated structure of very considerable rigidity.
Where the corrugated form of my invention is not desired, the cup may be formed as in Fig. 2 with the outer casing 3* made of a .somewhat thicker and more porous stock.
In this form I preferably, although not necessarily, carry the wall up to the rolled lip at the top of the wall 1 thereby affording additional support.
In the form shown in Fig. 2, I have indicated the bottom of the enclosing sleeve 3' as extended below the bottom of the inside cup as indicated at 3 so that it will act as an insulating guard for the cup bottom.
' As illustrating a further variant of my invention I have shown in Fig. 4 a form of cup in which the outer sleeve member 3 is provided with an inturned roll or bead at its 'upper edge whereby it is spaced from the inner cup Wall 1. In this. form I preferably, although not necessarily, turn back the bottom of the outer sleeve 3 as at 3 to assist in spacing the wall 3 and to further protect and support the cup bottom 2.
In Fig. 4 I have also shown another feature which may be included in any of the other forms of my invention although it enters into a particularly advantageous combination in connection with the form shown in Fig. 4. In this form I form the cup bottom 2 of a transparent paper stock and msert beneath it a disc D upon which, may be printed anyadvertising matter, so that the same will be visible through the transparent cup bottom 2. This disc D may be supported ;by the upturned portion'3 of the-outer sleeve 3*. This same structure maybe applied to the corrugated form shown in Fig.
1 or'may. be otherwise formed or embodied either as an independent disc D or as an additional or auxiliary bottom. The essential feature is that its printed matter be covered by the transparent inner bottom which protects it from the action of the liquid and protects the contained liquid from, contam1nation with the imprinted matter.
I have explained several embodiments of my invention as indicating varied types because of the varied demands of the trade for special cups for special purposes. It will be understood that while these cups are primari ly intended for hot beverages, that they are useful for cold beverages or even beverages at normal temperatures where the insulating feature is not necessary. In all these forms the strength of the cup and its rigidity and resistance to deformation by unintentional lodesire to sea tapered walled container having an upturned bottom and a tapered corrugated insulating sleeve having integral corrugations frictionally engaging said Walled container,
' said sleeve extending underneath said raised bottom'of said container.
3. An insulating holder for a paper cup comprising a corrugated outwardly flaring tapered wall having an inwardly disposed flange upon which the bottom of the paper cup is adapted tobear.
4. An. insulating holder for a paper cup comprising a corrugated wall having an inwardly disposed lip-turned flange adaptedto receive the bottom of the paper cup.
5. As a new article of manufacture, a tapered paper drinking cup adapted to receive hot liquids and a paper sleeve having verticall disposed integral corrugations frictiona 1y engaging said paper cup whereb insulation is provided between the cup an the hand of the user, said sleeve extending downwardly beyond the bottom of the paper drinking cup and providing insulation for the bottom of the cup.
In testimony whereof I afiix my signature.
WILLIAM E. BENSON.