GB2327035A

GB2327035A - Cup lid with means to retain foldback portion in open position

Info

Publication number: GB2327035A
Application number: GB9823163A
Authority: GB
Inventors: Melle Hugh Van
Original assignee: Amhil Enterprises Ltd
Current assignee: Amhil Enterprises Ltd
Priority date: 1997-02-24
Filing date: 1997-02-24
Publication date: 1999-01-13
Anticipated expiration: 2017-02-24
Also published as: GB2327035B; GB9823163D0

Abstract

A disposable cup lid is provided for covering the open end of a beverage cup, especially a hot drinks cup. An opening is formed in the lid by lifting and tearing the material of the cup lid at a designated portion 30 of the rim thereof, then folding back the drink-through portion of the lid about a hinge 28, with the edges 37,39 of the drink-through portion being defined by an orientation grain in the lid caused by extrusion of the plastics sheet material from which it is formed. A pair of ridges 32 stand up from the cover and cooperate with a securing protrusion 34 to lock back the foldback portion. The protrusion 34 is in a recess 62 which accommodates part of the folded-back portion. Stiffening ribs 64,68 in the form of arrows are provided.

Description

FOLDBACK CUP LID HAVING COMFORTABLE DRINKING CHARACTERISTICS This invention relates to disposable cup lids, and particularly cup lids which are intended for use with hot beverages such as coffee and the like. The cup lids of the present invention are intended for placement over disposable hot drink cups, being the sort of single use cup in which hot drinks are vended from machines, from street vendors, from coffee and donut shops, and the like.

The use of disposable cup lids on disposable, single use hot drink cups, has been known for many years. The disposable cup lids are generally vacuum formed from thin sheets of extruded polystyrene plastic. Other thermoformed sheet plastics materials may also be used.

The lids are formed using thermo- and vacuum-forming machines, whereby the thin polystyrene sheet is pulled down over or into a male or female mold, respectively, cooled, stripped from the mold, and stamped or die cut so as to form discrete cup lids. In the North American markets alone, and in the European markets, literally millions of such disposable cup lids are manufactured for single use purposes, used in the respective hot drink markets, and then disposed of, every day.

It has been known for some time that, when the thin sheet of polystyrene plastic is extruded, an orientation grain is formed in the sheet of polystyrene material. The orientation grain acts in such a manner that the polystyrene material can be torn easily in a direction along the orientation grain, but is much more difficult to tear or fracture in a direction perpendicular to or otherwise at an angle to the orientation grain. This fact, in turn, in taken advantage of in manufacturing disposable cup lids especially for use with hot drinks, whereby a so-called "foldback cup lid" is formed. In this manner, a drink-through portion can be formed in the cup lid when the purchaser of the hot drink desires to consume that beverage.

The drink-through portion of the cup lid is generally a small portion formed at the periphery thereof and extending more or less radially but more generally along the extrusion lines formed in the material of the cup lid, into the interior cover or panel portion of the cup lid. This permits an opening to be formed in the lid, whereby the cup with that opening formed in its lid may be brought to the mouth of the user, and the beverage consumed.

Moreover, the configuration of a drink-through lid also permits the lid to otherwise remain in place over the major portion of its area, thereby retaining steam or warm vapour within the confines of the covered cup and thereby reducing the rate at which the beverage will cool.

However, whenever a drink-through portion of a cup is formed by peeling back or tearing out a small portion of the cup lid, such a step involves breaking or tearing the rim or skirt of the cup lid, across a small portion thereof, and then tearing or folding back the rim and the adjoining portion of the panel of the cup lid. This, in turn, results in sharp edges at each side of the opening or gap thereby formed in the rim or skirt of the cup lid. Very often, however, those sharp edges may be uncomfortable to the lips and/or the tongue of the user, This, in turn, may tend to negate the purpose for the foldback portion of the cup lid because if the user rejects the discomfort due to the sharp edges defining the drink-through portion, then the user may simply opt to discard the cup lid in its entirety. This, in turn, will lead to faster cooling of the hot drink, and prospectively as well to an increased risk of spillage.

Moreover, particularly with drink-through lid having a foldback portion, it is not uncommon for the foldback portion to be not well retained in its folded back configuration, due at least in part to the elastic memory characteristic of the material of the cup lid, so that that folded back portion may be awkwardly in place in such a manner that it may interfere with the upper lip or even the nose of the user as she or he attempts to drink a beverage from the cup.

This also may result in a decision by the user, therefore, simply to opt to discard the cup lid in its entirety.

The present inventor has discovered, quite unexpectedly, that an improved cup lid having a drink-through portion can be provided, presenting advantages over prior art cup lids which otherwise provide drink-through lids, by configuring the rim of the cup lid, and the central panel thereof, in manners to be described in greater detail hereafter.

Among prior art patents which describe drink-through lids, there are included the following: Canadian patent No. 1,236,426 shows a disposable lid which is specifically intended for friction fit over an open mouth container, such as those formed from expanded polystyrene beads. In any event, the disposable lid is formed such that it has an outer annular skirt whose lower end is outwardly flared into an annular flange. In that flange, there are formed two spaced apart ribs located within a single quadrant of the lid and which define a notch in the bottom surface of the outer peripheral edge of the lid. This provides a fracture control means within the one quadrant. However, the formation of the lid requires precise blanking and cutting; and it must not be overlooked that the purpose of the notches is merely to promote fracture or breakage of the material of the cup lid at the periphery thereof.

United States patent No. 5,111,961 teaches a thin plastic disposable cup lid having a small foldback portion that is partially removed from the remainder of the lid by being torn along tear lines that are coincident with the oriented fibres of the plastic material. According to that invention, there is no requirement for pre-formed score lines, slits, or notches, so as to facilitate proper tearing of the lid. The foldback portion is hinged, and means are provided to retain that foldback portion in an engaged position when it is folded back over the formed hinge in the lid. A tab is provided in one portion of the outer portion of the outer periphery of the lid, in an outwardly directed flange, to provide a portion thereof which can be gripped in the fingers of the hand so as to initiate the tearing and folding back operation. However, the overall configuration of the central panel of the lid is generally planar, so that the foldback portion is retained in a position above the plane of the lid.

United States patent No. 5,348,181 teaches a winged cup lid, whereby one or a pair of tabs that extend from the cover portion of the lid may be folded downwardly to provide a gripping area which is otherwise insulated from the cup. The cup lid may optionally include an openable flap which is defined at its outer circumference by a frangible line of weakness, and along its two sides by a pair of frangible lines of weakness. However, at least the circumferentially formed frangible line of weakness must be stamped or die cut in order to ensure that the material of the cup lid will fracture in the appropriate place. A recess is formed to receive the flap, after it is folded back over its hinge, to be retained within the recess. The principal feature is that, because the circumferential frangible line which defines the outside of the drink-through portion is interiorly located inside the inside rim of the beverage cup, hoop stress around the entire rim of the beverage cup is maintained. However, the drink-through portion is awkwardly located.

United States patent No. 5,197,624 teaches a cup lid having a peripheral flange and a central portion which contains a reclosable access closure flap which may be selectively moved between an open and a closed position. In this case, a horizontally directed pull tab is formed at the outer periphery of the lid, and an upstanding retainer element is formed in the central portion of the lid. When the foldback portion is folded back into place, at least the pull tab thereof is retained in a position which may be above the plane of the cup lid and which could interfere with the upper lip and/or nose of the user.

United States patent No. 5,183,172 drink-through container lid having a lift tab which is positioned above the bottom of the remainder of the skirt so that, when it is intended to fracture the lid to form the foldback portion, less force is required to initiate fracturing. This reduces the likelihood that the entire lid will become separated from the container.

United States patent No. 5,090,584 teaches a disposable container lid having an access strip which is provided with a pair of tear impressions extending from the rim to a hinge means located in the central portion of the lid.

The access strip is folded back and pushed against the central portion of the lid in such a manner that the deflection flap is intended to be deflected downwardly towards the contents of the container. Small retaining flaps spring past the sides of the access strip of the foldback portion and overlap those sides. Manufacture of the disposable container lid requires very precise vacuum forming and die cutting, to manufacture the lids.

The present invention will be described hereafter, in association with the accompanying drawings which describe the invention for purposes of illustration thereof, and in which: Figure 1 shows a portion of a cup lid according to the invention; and Figure 2 is a cross-sectional view taken along the line 2-2 in Figure 1.

In many respects, the general configuration of cup lids in keeping with the present invention is not unlike the configuration of cup lids shown in the inventor's prior United States Patent No. 5,111,961.

Thus, the cup lid 60 has a cover portion 12, and a lip portion 14. The cover portion 12 generally spans across the opening of a cup when the lid 10 is placed thereon, with the edges of rim of the cup surrounding its mouth being received in the lip portion 14. Thus, the lip portion defines a downwardly facing cavity 16 which is adapted to receive a corresponding rim on the beverage cup over the mouth of which the cup lid is placed.

There may be an area of the lip portion 14 which has a reduced diameter, as shown at 17. The reduced waist portion 17 may contribute to the manner in which the lip portion 14 and cavity 16 grip and accommodate the rim portion of the cup to which the disposable cup lid is fitted.

In general, the cover portion is generally planar, although it may have specifically formed features, as will be described hereafter, molded into it. In any event, there will be a foldback portion of the cup lid; not as the cup lid is manufactured, but as the disposable cup lid is fractured and torn when in use. That foldback portion is, however, to be formed in a between the broken lines 37 and 39 particular portion of the cup lid, shown generally # There is, as previously stated, an orientation grain which is caused by extrusion. The orientation grain, the direction of which is shown at 22, comes as a consequence of the extrusion in the polystyrene sheet material from which the disposable cup lid is formed. The edges 24 and 26, which will define the foldback portion 20 when it is formed, will generally be more or less in the same direction and therefore parallel to the orientation grain 22.

The foldback portion 20 will, however, be subtended by or terminate at a generally "U"shaped hinge portion 28 which is formed in the cover portion of the lid. This precludes the possibility that the foldback portion will tear too far into the interior region of the cup lid.

A grasp tab 30 is formed adjacent the lip portion 14, and the grasp tab 30 extends outwardly from the periphery of the lip portion 14 in a plane which is generally parallel to the plane of the cover portion 12. Thus, the grasp tab 30 extends more or less perpendicularly from the edge of the lip portion 14. It will be seen, therefore, that the foldback portion 20 is defined by sides 24 and 26, the "U"-shaped hinge portion 28, and the grasp tab 30.

As described in greater detail hereafter, disposable cup lids in keeping with the principals ofthis invention may incorporate certain features originally introduced in Applicant's United States patent No. 5,111,961. In particular, there may be provided a pair of ridges 32, which are adapted to co-operate with protrusion 34 to lock the foldback portion 20 in place when it is formed and folded back.

A pair of grasping ridges 32 are shown to be generally radially extending and upstanding with respect to the general plane of the cover portion 12. They are formed in the cover portion adjacent the lip portion 14, and extend radially inwardly from the lip portion 14 and from the grasp tab 30. The securing protrusion 34 is formed radially in line with the pair of grasping ridges 32; and the location of the securing protrusion is radially in line with the grasping ridges 32 and spaced away from the "U"-shaped hinge 28 at the side thereof remote from the grasping ridges 32. Obviously, the spacing between the grasping ridges 32 and the width of the securing protrusion 34 are such that, when the grasping ridges are placed over the securing protrusion, and are co-operative with each other, the foldback portion 20 of the cup lid 60 will be locked into its folded back configuration, as shown generally in Figure 2.

There is a recess 62 which is formed below the general plane of the cover portion 12 of the lid 60. Thus, as shown also in Figure 2 in dotted or ghost outline, when the foldback portion 20 is in its folded back configuration, the outer portion of the lip portion 14 extends downwardly into the recess, and is thereby more clearly out of the way and less likely to interfere with the upper lip and/or nose of the user.

There may also be a pair of arrows 64 which are molded into the recess 62, and also a pair of arrows 68 which are molded into the cover portion of the lid 60 in the region thereof which will form the foldback portion 20. Each of the pairs of ribs 64 and 68 has the added characteristic that they provide stiffening ribs for the recess 62 and for the foldback portion 20.

Claims

1. A disposable cup lid for covering the open end of a beverage cup, where the cup lid is vacuum formed from an extruded thermoplastic sheet material having an orientation grain caused by extrusion, comprising: a cover portion and a lip portion, the lip portion defining a downwardly facing cavity around the cover portion and adapted to receive a corresponding rim of a beverage cup, the cover portion being generally planar and having a foldback portion therein located near the periphery of the cover portion and extending into the lip portion, the foldback portion spanning a minor segment of the cover portion and the lip portion, a "U"-shaped hinge portion formed in the cover portion and subtending the foldback portion, a grasp tab formed adjacent the lip portion and extending outwardly from the periphery thereof in a plane which is generally parallel to the plane of the cover portion, the foldback portion having a first side, a second side, a first end, and a second end, the first end being coincident with the grasp tab, the second end being coincident with the "U"-shaped hinge, and the first and second sides being parallel one to the other and coincident with the orientation grain, a pair of generally radially extending and upstanding ridges formed in the cover portion adjacent the lip portion and radially inwardly from the grasp tab, and extending upwardly above the plane of the cover portion, a securing protrusion formed radially in line with the pair of ridges and spaced away from the "U"-shaped hinge at the side thereof remote from the ridges, and extending downwardly from the plane of the cover portion, and a recess is formed below the general plane of the lid, in which the spacing between the ridges and the width of the securing protrusion are such that the ridges and securing protrusion and co-operative with each other to lock the foldback portion in a folded back configuration, and in which the securing protrusion is located in eh recess so that the upper surface of the protrusion is generally in the plane of the lid, and so that the portion of the rim between said grasp tab and said ridges will extend downwardly into that recess when the foldback portion is folded back around the "U"-shaped hinge and the foldback portion is locked in its folded back configuration.

2. The disposable cup lid of Claim 1, wherein at least a pair of stiffening ribs is formed in the foldback portion of said cup in the general vicinity of said pair of grasping ridges.

3. The disposable cup lid of Claim 1, wherein at least a pair of stiffening ribs is formed in said recess, in the general vicinity of said securing protrusion.

4. A disposable cup lid for covering the open end of a beverage cup, substantially as herein described with reference to Figures 1 and 2 of the accompanying drawings.