Dispenser for cups and like containers

Abstract: An apparatus for storing a supply of cup-shaped elements such as containers in a stacked, telescopically interfitted relationship comprises a tubular housing (12") with a resilient diaphragm (14") across the lower end. The diaphragm (14") has a centre opening (22") through which the lowermost container extends. The diaphragm (14") acts to retain the stack in the housing while permitting the lowermost container to be withdrawn. The diaphragm (14") includes integral fingers (50) which extend radially inwardly of the opening (22"). The fingers (50) each decrease in width and thickness in the radially inward direction and may include a transverse rib (52) on their inner surface (50a) to engage the lowermost container in the stack.

Description: The invention relates to container dispensers and, more particularly, to a diaphragm type container dispenser assembly and to an improved diaphragm therefor which is capable of handling an extremely large range of cup sizes. Cup dispensers of the type under consideration are commonly used in the fast food or convenience industry to maintain a supply of cups adjacent the beverage dispensing equipment for use as required. The dispensers typically comprise a storage tube or cylinder which holds a telescopically interfitted stack of cups. Across the lower end of the tube, there is a resilient diaphragm having a central opening through which the bottom portion of the lowermost cup in the stack extends. The diaphragm resiliently grips and holds the lowermost cup and thereby supports it and the telescopically interfitted stack thereabove. As the lowermost cup is pulled through the diaphragm opening, the diaphragm grips the next superjacent cup in the stack to hold it and the stack as the lowermost cup is removed. GB-A-2214499 discloses a cup dispenser of this general type in which the diaphragm is comprised of a continuous integral sheet of resilient highly elastic material having a central opening in it. The periphery of the opening is continuous. Document US 3315842 discloses a dispensing apparatus as defined in the preamble of claim 1 wherein the diaphragm comprises a plurality of fingers extending radially inwardly of the opening. The resiliency of the diaphragm and the diameter of the central opening generally act as the limiting factors with respect to the range of cup diameters that can be handled by any single diaphragm. Typically, a large number of different diaphragms must generally be provided in order to properly hold the usual range of cup sizes. Similarly, different diaphragms must be used for fragile cups or ice cream cones. Alternative designs using mechanical spring fingers and the like have been proposed. These have also been limited in the range of sizes which they can dispense. One object of the invention is the provision of a cup or container dispensing apparatus of the general type described which is capable of readily handling a wide variety of sizes and types of containers or cup members without changing the diaphragm dimensions and construction. Another object of the invention is the provision of an apparatus for dispensing cups or containers in which the diaphragm which retains the cups in their stacked relationship exhibits an ability to engage and retain cups ranging from small and delicate cones to relatively large and rigid plastic containers. A further object is the provision of a diaphragm structure which can be moulded as a single unitary element and which does not require any special springs, levers, or associated structure. A still further object is the provision of a cup or container dispensing apparatus wherein a single diaphragm is all that is required to perform the dispensing function. The invention provides a dispensing apparatus of the general type described wherein the diaphragm member has an improved design which allows it to function with a greater range of cup sizes and configurations. In addition, the same diaphragm member can suitably dispense relatively rigid plastic cups as well as delicate and fragile containers, such as ice cream cones. Because of the wider range of cup types and sizes which any one size of diaphragm member can handle, the number of different sizes of diaphragms which must be manufactured and stocked is greatly reduced. This greatly simplifies both manufacture and use. In accordance with the invention, there is provided an apparatus for storing and dispensing a supply of containers in a telescopically interfitted stacked relationship. The apparatus comprises an elongated tubular housing for maintaining the containers vertically aligned in their stacked telescopically interfitted relationship. The housing includes a resilient diaphragm extending across its lower end with an opening through which the lowermost containr of the stack can extend. The diaphragm acts to retain the stack in the housing while permitting the lowermost container to be withdrawn. The present invention provides the improvement wherein the diaphragm comprises a unitary body of resilient elastomeric material with the periphery of the opening defined by a plurality of integral fingers extending radially inwardly of the opening and having width and thickness which progressively decreases proceeding in a radially inward direction. Preferably, and in accordance with a more limited aspect of the invention, each finger has a surface facing the stack of containers which is provided with a transverse rib for engaging the lowermost container. Each rib is closely adjacent the radially innermost end of its respective finger. In the form of the invention using the integral fingers, the diaphragm can be formed from somewhat stiffer and slightly less resilient elastomeric materials as compared with those used in forming the diaphragm which is the subject of European Patent Application No. 92308037.8 (Publication No. 0531147) from which the present application has been divided. Since the fingers constitute discrete portions which are not interconnected along their radial side edges, their engagement force with the stack of cups or containers is controlled by their relative stiffness as opposed to resistance to elongation. The decreasing width and thickness in the radially inward direction produces the desired variation in engagement forces to facilitate removal of the lowermost container while retaining the next superjacent container. The addition of the transvers ribs further enhances this funtioning by applying a line of higher pressure to the lip or end flange area of the next superjacent container as the lowermost is removed. When the apparatus is formed in the manner described, it is capable of handling devices or elements of cup-like form throughout a wide range of diameters. It is believed that the greatly improved ability to function throughout a wide range of cup diameters results from the increasing resistance to elongation exhibited by the diaphragm progessively radially outwardly. This results in increased pressure at radially outward spaced locations. As a consequence, as the lowermost cup in the stack is pulled downwardly, the diaphragm places an increased pressure on the rim of the next superposed cup to grip and hold it as the lowermost cup is withdrawn. Additionally, the increase in pressure progressively radially outwardly assures that there is a differing low pressure for the smaller, delicate cups as compared with the larger and more rigid cups. It has also been found that, with the above arrangement of the diaphragm, the system can be used to dispense cups having an asymmetrical upper lip. This type of cup is sometimes used for serving French fries and similar food products. The arrangement of the diaphragm results in an increased pressure and transfer of the pressure from the lip of the withdrawn cup to the next cup in line as the asymmetrical edge is pulled through the diaphragm centre opening. The invention is further described, by way of example, with reference to the accompanying drawings, wherein:- Fig. 1 is a detailed vertical section through a cup dispenser in accordance with the present invention; Fig. 2 is a plan of the diaphragm of the Fig. 1 embodiment; Fig. 3 is an enlarged view of the circled area of Fig. 1 (the engagement of the diaphragm with the container stack is shown in phantom); and Figs. 4 and 5 are respectively a vertical section and a plan of the Figs. 1 to 3 cup dispenser. Fig. 1 shows the overall arrangement of a cup storage and dispensing apparatus which comprises a main housing 12'' having a diaphragm 14'' extending across the lower end thereof and retained thereon in any convenient manner. The housing 12'' could have a variety of constructions but is shown as a simple, open-ended tubular member 18'' formed from stainless steel, plastic or the like and having a substantially cylindrical shape. As is known, the tubular member 18'' could be adjustable in diameter if desired. In any event, its diameter is sufficient to allow it to store a supply of containers or cups in a stacked, telescopically interfitted or nested relationship. The cups are maintained in the stacked and interfitted relationship with the lowermost cup of the stack extending outwardly of the bottom of the housing 12'' through a centre opening in the diaphragm 14''. The general overall arrangement is well known and is shown, for example, in US-A-4925058; US-A-1155562; US-A-1808284; and US-A-3211329. As discussed earlier, problems with the apparatus of the general type under consideration have been concerned with the inability of the diaphragms to handle a wide range of cup sizes. That is, a relatively large range of diaphragms with differing centre hole diameters were required in order to handle the typical range of cup sizes ordinarily encountered. In accordance with the subject invention, the diaphragm has a particular improved design and arrangement such that it can readily adapt and function with cups having widely differing overall shapes and diameters. As illustrated in Fig. 1, the diaphragm 14'' is fitted to the lower end of the tubular housing 18'' by an axially directed cylindrical flange 20'' which is formed integrally with the main body of the diaphragm. The flange 20'' is relatively heavy in this embodiment and is provided with an inwardly extending groove 20a about its lower inner end to receive an outwardly extending flange on the housing 18''. By forming the flange relatively heavy and with the configuration shown, it is possible to dispense with the use of an outer peripheral mounting clamp. However, a clamp could be used if desired. Of particular importance to the Figs. 1 to 3 embodiment is the arrangement of the central opening 22''. The central opening 22'' is defined by a plurality of discrete, inwardly extending fingers 50 which are located in circumferentially spaced relationship about the opening 22'' and extend radially inwardly from the outer peripheral portion of the diaphragm. The fingers 50 are integral with the remaining peripheral edge and flange 20'' of the diaphragm 14''. Each individual finger 50 tapers to a narrower, inner end portion from a wider, outer peripheral portion. Each finger thus has somewhat of a triangular shape in plan view as best seen in Fig. 2. The inward extent of each finger 50 is such that it extends well within an imaginary circle which corresponds to the maximum diameter of the cups or containers to be dispensed from the assembly. This is shown by the dotted line of Fig. 2. Referring to Fig. 3, each individual finger 50 also tapers in its radial thickness. It is thinnest at the inner end and gradually increases in thickness to the outer peripheral area. This provides a variation in stiffness and resistance to deflection for each finger. The actual size and spacing of the individual fingers could vary, but they should preferably be relatively equally spaced circumferentially about the opening 22'' and should further have relatively equal resistance to defection so that they act to centre and locate the stack of cups within the housing 18''. In addition to the radial and circumferential tapering of the fingers 50, it is preferable that their upper surface 50a which engages the cups as shown in phantom in Fig. 3 be provided with a relatively rigid, upwardly extending rib 52 as shown. Each of the ribs 52 extends in a generally transverse direction as seen in Fig. 2. The ribs terminate in a point which, when deflected to the cup-retaining position shown in phantom in Fig. 3 engage the surface of the stack of cups with relatively heavy line contact. With the ribs in engagement with the surface of the cup in the manner shown, the act of pulling the lowermost cup downwardly from the stack causes the rib 52 to move over the upper end of the lowermost cup and engage the superjacent cup with a relatively high level of force. The lowermost cup can then be pulled further downwardly while the superjacent cup and the stack supported thereby are retained in position. This functions in this manner even on those cups which do not have a radially extending lip or circumferential top end bead. Since the diaphragm of the Figs. 1 to 3 embodiment does not rely on an increasing radial resistance to elongation, but rather on a variation in radial deflection, the material from which the diaphragm is formed can be somewhat less resilient and more stiff than the material used for forming the diaphragam which is the subject of European Patent Application No. 92308037.8 (Publication No. 0531147) from which the present application has been divided. In this regard the elastomeric material sold under the trade name Kraton by Shell has been used satisfactorily for forming this embodiment. In addition, the diameter and various dimensions of the diaphragm could vary widely; however, Figs. 4 and 5 show preferred dimensions for a diaphragm formed from Kraton and intended to dispense cups in a diameter range from 38.1mm to 63.5mm (1-1/2" to 2-1/2"). The invention has been described sufficiently for one of ordinary skill in the art to make and use the same.

Claims: An apparatus for storing and dispensing a supply of containers having an open upper end and a substantially conical side wall tapering to a smaller bottom end, the apparatus comprising a housing (12'') for maintaining the containers in a stacked telescopically interfitted relationship and including a diaphragm (14'') with an opening (22'') through which the lowermost container of the stack extends and which diaphragm acts to retain the stack in the housing while permitting the lowermost container to be withdrawn, the diaphragm (14'') comprising a unitary body of resilient elastomeric material with the periphery of the opening (22'') defined by a plurality of integral fingers (50) extending radially inwardly of the opening (22'') and having width and thickness which progressively decreases proceeding in a radially inward direction, characterized in that a surface (50a) of the fingers (50) facing the stack of containers has narrow ribs (52) extending from the said surface (50a) for engaging the containers as they are pulled through the opening (22''). Apparatus as claimed in claim 1, wherein each finger (50) carries at least one rib (50a). Apparatus as claimed in claim 1 or 2 wherein the fingers (50) are of increasing stiffness in a direction radially outwardly of the opening. Apparatus as claimed in claim 1, 2 or 3, wherein each of the fingers (50) terminates at a radial location inward of the innermost rib (52). Apparatus as claimed in any of claims 1 to 4, wherein the fingers (50) are uniformly spaced circumferentially of the opening (22'') and wherein the ribs (52) are located adjacent the radially innermost ends of the fingers (50).

Inventors: ROETHEL HENRY G, ROETHEL, HENRY G.
Applicants: MEYER CO, THE MEYER COMPANY
Application year: 1992
Main classification: A47F1
IPC codes: A47F1