Shelf mounting support arrangement

Abstract

A shelf mounting support includes an annular flange portion having a side surface from which projects a cavity defining body portion. The mounting support is adapted to extend through an aperture formed in a liner of an appliance with the body portion of the mounting support being inserted in a respective aperture from an outer insulation zone side of the liner. Each mounting support is held in the aperture through the use of one or more retainer elements in the form of an adhesive element or flexible grip members. Thereafter, the liner is positioned within an outer shell of the appliance and foamed insulation is then injected into the insulation zone and into the internal cavity of the mounting support to anchor the mounting support in position.

Description

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention pertains to an appliance having an outer shell within which is positioned a liner having walls which are spaced from the outer shell so as to define an insulation zone therebetween and, more particularly, to a support arrangement used to mount a shelf extending across the liner walls in such an appliance, as well as a method of supporting the shelf in the appliance.

[0004] 2. Discussion of the Prior Art

[0005] In various types of appliances, it is common to provide some structure which will enable one or more shelves to be mounted within a given appliance compartment. For example, in a common household refrigerator, numerous shelves will be provided in order to enable various items to be supported at different vertical storage positions. In the prior art, these shelves are typically supported through specific mounting structure within the refrigerator. Such known mounting structure includes: integrally forming shelf supporting rails with a molded liner that defines the interior walls of a given refrigerator compartment; securing mounting brackets to opposing side walls of the liner through the use of threaded fasteners; and positioning mounting supports or grommets within apertures formed in the liner. Since it is highly desirable to permit the shelves to be vertically adjusted to selectively configure the overall shelving arrangement so as to accommodate varying sized items to be supported, multiple levels of these known mounting structures are generally provided in refrigerators.

[0006] When forming the liner of a refrigerator or other appliance, it is desirable to minimize the required thickness of the liner to reduce manufacturing costs. When the liner is integrally formed with the shelf supporting rails, the liner must be inherently thickened at the rails to some extent in order to assure that the rails will not fail under load conditions. Therefore, forming the shelf supporting structure in this manner generally adds to the manufacturing cost of the liner. In addition, if such a support rail were to fail or become damaged during use, serviceability is greatly limited.

[0007] Forming the mounting structure by attaching threaded fastener secured brackets to opposing side-walls of the liner provides for enhanced servicing in the case of part failure since a new bracket can be readily installed in place of the damaged bracket. However, since any given shelf will generally require four or more mounting brackets and numerous shelves will be provided in each appliance, the original appliance assembly can be quite cumbersome and time consuming. In addition, this type of mounting structure has several parts which itself can add to the cost associated with the manufacturing of the appliance.

[0008] Attaching mounting supports or grommets in the liner walls in order to support shelves therefrom advantageously reduces the number of supporting components and can simplify the assembly process. With most known arrangements, the mounting supports are, for the most part, retained in a desired position due to an in situ foaming process. More specifically, body portions of the mounting supports are generally inserted, from a refrigerated compartment side, within apertures provided in the opposing side walls of the liner after the liner has been placed in an outer cabinet shell of the refrigerator or other appliance. Thereafter, the space between the liner and the cabinet shell is injected with foamed insulation which will inherently flow about the body portions of the mounting supports. Once solidified, the insulation will securely retain the mounting structure in the desired position.

[0009] Of course, such an arrangement requires that the mounting supports be held in the desired position during the insulation injection process. Since the mounting support is inserted in the aperture from the refrigerated side of the liner, the mounting support can be undesirably pushed back through the aperture during the foaming operation as the insulation bears against a wall of the support. To this end, it has been proposed to provide the mounting support with an annular flange at one end and locating structure on the body portion of the support at a position spaced from the annular flange a distance equal to the thickness of the liner. With this arrangement, the support can be inserted into a respective aperture until the liner is arranged between the annular flange and the locating structure to hold the support in the desired position for the foaming operation. Unfortunately, this mounting support arrangement requires a rather fine degree of tolerance between the thickness of the liner and the distance between the annular flange and the locating structure in order to assure that the mounting support will be retained in the desired position and the foamed insulation will not leak into the cabinet compartment.

[0010] In view of the above, there exists a need in the art for a shelf mounting support arrangement that can be readily installed within apertures of an appliance liner with minimal effort, time and associated cost, and which can be easily retained in a desired position before and during the insulating process, while avoiding the need for high manufacturing tolerances but assuring that the foamed insulation will not leak into the interior of the liner or undesirably displace the mounting support.

SUMMARY OF THE INVENTION

[0011] A support arrangement is provided for mounting a shelf in a compartment of an appliance having an outer shell within which is positioned a compartment defining liner having walls spaced from the outer shell so as to define an insulation zone therebetween. The mounting support includes an annular flange portion and a body portion that projects from the annular flange. The body portion, upon which a shelf is to be supported, is adapted to be placed into an aperture formed in a side wall of the liner from the insulation zone side of the liner, while the annular flange portion is positioned against an outer wall surface of the liner.

[0012] In order to retain the mounting support in a desired position prior to injecting foamed insulation into the insulation zone in accordance with a first embodiment of the invention, an adhesive element is used to secure the annular flange portion to the liner. With this arrangement, the mounting support can be easily attached to an outer side wall surface of the liner in a desired position and retained in this position by the adhesive element. Thereafter, foamed insulation can be injected into the insulation zone in order to further anchor the mounting support.

[0013] In accordance with a further embodiment of the invention, instead of utilizing the adhesive element, the body portion of the mounting support is provided with a plurality of annularly spaced, deflectable grip fingers. The fingers function to engage an inner surface of the liner upon insertion. In order to account for variations in differing thermoformed liner thicknesses, the annular flange includes an outermost radial portion which is thin and flexible so as to deflect due to abutment with the liner upon insertion of the mounting support in order to provide an enhanced seal between the flange and the liner. Furthermore, to enhance the defecting of the flange in accordance with the most preferred form of this embodiment of the invention, the flange has a diameter which is at least three times the diameter of the body portion. In addition, the outermost radial tip of the flange, prior to insertion of the mounting support, is located in a plane that extends through at least a portion of the grip fingers.

[0014] To aid in the interengagement between the liner and the mounting support in accordance with each of the disclosed embodiments, while also structurally reinforcing the overall support arrangement, the body portion is advantageously provided with an internal cavity into which the insulation flows. In accordance with certain embodiments of the invention which is particularly adapted to use in mounting certain types of shelving units in a refrigerator, a terminal end of the body portion is formed with an annular groove adapted to receive a portion of a shelf to maintain a desired positioning of the shelf regardless of any shrinkage of the liner upon cooling of the enclosure. A method of mounting a shelf utilizing such a support arrangement is also provided in accordance with the invention.

[0015] Additional features and advantages of the present invention will become more readily apparent from the following detailed description of preferred embodiments of the invention when taken in conjunction with the drawings wherein like reference numerals refer to corresponding parts in the several views.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a front view of a refrigerator illustrating the positioning of various shelf mounting supports, constructed in accordance with the present invention, in a freezer compartment of the refrigerator;

[0017] FIG. 2 is a cross-sectional view illustrating the construction and mounting of a shelf support formed in accordance with a first preferred embodiment of the invention;

[0018] FIG. 3 is a front view of the shelf mounting support constructed in accordance with the first embodiment;

[0019] FIG. 4 is a side view of the shelf mounting support of the first embodiment;

[0020] FIG. 5 is a side view of a shelf adapted to be used with the mounting support arrangement of the invention;

[0021] FIG. 6 is a cross-sectional view, similar to that of FIG. 2, but depicting a shelf mounting support constructed in accordance with a second embodiment of the invention;

[0022] FIG. 7 is a front view of the shelf mounting support of FIG. 6;

[0023] FIG. 8 is a cross-sectional view generally taken along line VIII-VIII in FIG. 7;

[0024] FIG. 9 is a cross-sectional view, similar to that of FIG. 8, but of a third shelf mounting support embodiment of the invention;

[0025] FIG. 10 is a perspective view of a fourth shelf mounting support embodiment of the invention;

[0026] FIG. 11 is a cross-sectional side view of the shelf mounting support of FIG. 10;

[0027] FIG. 12 is an enlarged, cross-sectional side view of a portion of the shelf mounting support of FIGS. 10 and 11;

[0028] FIG. 13 is an elevational end view of the fourth shelf mounting support embodiment; and

[0029] FIG. 14 is a cross-sectional view illustrating the mounting of the fourth shelf mounting support to an appliance liner in accordance to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] With initial reference to FIG. 1, the shelf mounting support arrangement of the present invention is shown for use in connection with a refrigerator 2 which comprises a cabinet shell 6 including a top wall 8 and side walls 10 and 11. As is known in the art, cabinet shell 6 of refrigerator 2 also includes a rear wall (not shown) that is secured to each of the top and side walls 8, 10 and 11, with each of the walls being typically formed of sheet metal. In the embodiment depicted for descriptive purposes, refrigerator 2 constitutes a top-mount style refrigerator and therefore includes a mullion 13 which separates the interior of refrigerator 2 into an upper freezer compartment 16, that is defined by a liner 17 positioned within cabinet shell 6, and a fresh food compartment (not shown), that is located below mullion 13 and which has an access door 20 positioned thereacross. As is well known in the art, door 20 can be opened by means of a handle 22 and is pivotally mounted through a central hinge unit 24, as well as a lower hinge unit (not shown). Of course, freezer compartment 16 would also be provided with a door that could be selectively opened and closed and which would pivot upon central hinge unit 24, as well as an upper hinge unit 27. However, in order to better illustrate the aspects of the present invention, such a freezer door has not been shown in FIG. 1.

[0031] With reference to FIGS. 1 and 2, liner 17 is shown spaced from side wall 10 so as to define a zone 30 therebetween. In a similar manner, liner 17 is also spaced from top wall 8 and side wall 11. Zone 30 is adapted to receive insulation 32 which, in the preferred embodiment, is constituted by foamed insulation that is injected between liner 17 and cabinet shell 6 during a latter stage in the assembly of refrigerator 2.

[0032] Of course, the basic structure described above is found in numerous refrigerators readily available in the marketplace. In fact, in order to permit better stacking of items placed within refrigerator 2, it is known to provide various shelves which can be selectively positioned at varying vertical heights. The present invention is actually directed to the particular manner in which shelves can be supported at a selected height within refrigerator 2. In accordance with the present invention, one or more shelves are adapted to be supported by particularly constructed mounting supports indicated at 41. Each mounting support 41 is actually part of a set of mounting supports, with each set being arranged in a different horizontal plane to enable a shelf to be placed at a desired height. Each mounting support 41 is adapted to be inserted and retained within a respective aperture 44 formed in liner 17. Prior to describing the particular manner in which each mounting support 41 is retained and anchored in a desired position, reference will be made to FIGS. 2-4 in describing the structure of a first preferred embodiment of mounting support 41.

[0033] As shown in FIGS. 2-4, mounting support 41 includes an annular flange portion 52 that has first and second opposing sides 54 and 55. Projecting from second side 55 of annular flange portion 52 is a body portion 63 of mounting support 41. Body portion 63 includes a first portion 65 and a second portion 68 which is interconnected to first portion 65 by an annular grooved portion 71. As clearly shown in FIGS. 2 and 4, mounting support 41 has a central opening 73 formed in flange portion 52 that leads to an internal cavity 77 defined within first portion 65. In addition, an internal passageway 80, leading from cavity 77, is preferably formed through both grooved portion 71 and second portion 68 of body portion 63 for the reason which will become fully apparent.

[0034] FIG. 2 will now be particularly referenced in describing the manner in which mounting support 41 is initially retained in a desired position and then anchored in place. Prior to interconnecting the basic structure of refrigerator 2, including cabinet shell 6, mullion 13 and liner 17, body portion 63 of each mounting support 41 is inserted within a respective aperture 44 formed in liner 17 from the to-be-insulated side of liner 17, i.e., on the outer side of liner 17 which aids in defining zone 30, such that body portion 63 projects into compartment 16. The insertion of the mounting supports 41 in apertures 44 can be performed manually or through a robotic operation. Apertures 44 can be formed either during the molding stage of liner 17 or, if vacuum formed, can be subsequently drilled or pierced therein. When body portion 63 is fully inserted, an adhesive element 85 is advantageously used to attach flange portion 52 to liner 17. In the embodiment of FIG. 2, adhesive element 85 constitutes a strip of tape that adheres to both flange portion 52 and liner 17. A central hole (not labeled) is either pre-formed in the strip of tape or the strip of tape is punctured to create an opening leading into cavity 77. Of course, each mounting support 41 is similarly attached to liner 17. Once this interengagement occurs, each mounting support 41 will be retained in its desired position and liner 17 can be positioned within cabinet shell 6.

[0035] As indicated above and shown in FIG. 1, various vertically spaced sets of mounting supports 41 can be provided to enable adjustability of a given shelf. Once each of the mounting supports 41 is installed in the manner described above, the foamed insulation 32 can be injected between liner 17 and cabinet shell 6. The foamed insulation 32 will inherently flow into cavity 77 of each mounting support 41. With this arrangement, after the foamed insulation solidifies, each mounting support 41 will not only be securely anchored in position but the solidified insulation within cavity 77 will structurally reinforce body portion 63. As clearly shown in FIG. 2, passageway 80 tapers and opens at second portion 68. This opening will permit air to bleed out of cavity 77 to assure that cavity 77 is completely filled with the foamed insulation.

[0036] Once the mounting supports 41 are securely anchored in position, a shelf 90, such as that shown in FIG. 5, can be readily supported on a given set of mounting supports 41. More specifically, with each set of mounting supports 41 constituting, in accordance with the preferred embodiment, two pairs of mounting supports positioned in a common plane along opposing side walls (not labeled) of liner 17, shelf 90 includes a pair of fore-to-aft spaced slots 92 and 93 on each side thereof which receive respective body portions 63. As shown, slots 92 and 93 preferably slope forwardly and upwardly to facilitate positioning and retaining of shelf 90 on the selected set of mounting supports 41 in a generally horizontal plane.

[0037] As additional specifics of shelf 90 are not considered part of the present invention, they will not be discussed herein. In fact, it should be understood that mounting supports 41 can be used in connection with various types of shelves, including molded plastic, combination plastic/glass and wire shelves without departing from the invention. However, utilizing a shelf with at least a molded plastic frame, such as shelf 90, is preferred, particularly when mounting supports 41 are utilized in the fresh food compartment of a refrigerator. In this case, such as when mounting a crisper shelf, it has been found advantageous to have a portion of the shelf frame extend within the grooved portion 71 of each mounting support 41 in order to enhance the retention of the shelf in case the liner shrinks during use. Therefore, from the above discussion, it should be apparent that the presence of groove portion 71 is optional, depending on the particular type of shelf being supported.

[0038] With this in mind, reference will now be made to FIGS. 6-9 in describing additional mounting support embodiments of the invention. As shown in FIGS. 6-8, a mounting support 141 constructed in accordance with another embodiment of the invention includes an annular flange portion 152 that has first and second opposing sides 154 and 155. Projecting from second side 155 of annular flange portion 152 is a body portion 163 of mounting support 141. Body portion 163 includes a first diametric portion 165 and an integrally formed, second diametric portion 168 that has a terminal end wall 174. In a manner similar to mounting support 41, body portion 163 of mounting support 141 defines an internal cavity 177 that is adapted to receive a flow of foamed insulation or the like following retaining of mounting support 141 in a corresponding aperture 44 and completing the assembly of liner 17 to shell 6.

[0039] Mounting support 141 is also adapted to be initially attached to liner 17 through the use of an adhesive element 185 which, in this illustrated embodiment, is secured to second side 155 of annular flange portion 152 adjacent body portion 163. Although adhesive element 185 can constitute various adhesive substances known in the art, in the preferred embodiment, adhesive element 185 constitutes double-sided adhesive tape. Based on the above and as shown in FIG. 6, mounting support 141 is retained in aperture 44 in a manner generally commensurate with mounting support 41 described above, except that adhesive element 185 is interposed between flange portion 152 and liner 17.

[0040] Although in this embodiment first diametric portion 165 and aperture 44 are sized to have a minimum gap therebetween, even if manufacturing tolerances are expanded, the positioning of adhesive element 85 from first diametric portion 165 outward towards outer end 160 of annular flange portion 162 will advantageously provide a seal that will prevent the undesired ingress of the injected foamed insulation 132 from entering freezer compartment 16. Since the adhesive element 185 is annular as clearly shown in FIG. 7, positioning adhesive element 185 along any portion of second side 155 of annular flange portion 152 will effectively provide a complete annular seal about aperture 44. Of course, although adhesive element 185 is only shown to extend from directly adjacent body portion 163 towards outer end 160 in these figures, adhesive element 185 can extend entirely to outer end 160 to prevent the flow of foamed insulation 32 between annular flange portion 152 and liner 17 to minimize the development of axial forces tending to push mounting support 141 away from liner 17.

[0041] Based on the description provided above, it should be readily apparent that each of the embodiments employs an adhesive-type retainer element as a temporary mounting arrangement prior to the foamed insulation 32 solidifying. FIG. 9 illustrates an embodiment of a mounting support 141a which differs only from mounting support 141 in basically the length of first body portion 163a and, more particularly, in the length of first portion of 165a and therefore cavity 177a. Other portions of mounting support 141a have been identified with corresponding reference numerals and will not be discussed in detail. In any event, it should be recognized that other retainer arrangements could be employed without departing from the invention, while still overcoming deficiencies in the known prior art. The embodiment of FIGS. 10-14 represents a still further arrangement for carrying out this invention. Specifically a mounting support 241 includes an annular flange portion 252 that has opposing sides 254 and 255. Projecting from second side 255 is a body portion 263 which has a first portion 265 and a terminal, second portion 268. First and second portions 265 and 268 are spaced by a grooved portion 271. In addition, body portion 263 has an associated internal cavity 277 which terminates in an end wall 279. With this construction, body portion 263 can be used to support a shelf in a manner corresponding to that described above with reference to the embodiment of FIG. 2-4.

[0042] However, mounting support 241 differs from each of the prior discussed embodiments with respect to the particular manner in which body portion 263 is maintained in position in a corresponding aperture 44 prior to the insulation curing process. As clearly shown in these figures, body portion 263 is formed with retainer elements in the form of a plurality of resilient finger grip members 280. Although the number of finger grip members 280 can vary in accordance with the invention, body portion 263 is shown to include three finger grip members 280 at sixty degree intervals. Each finger grip member 280 includes an enlarged, outwardly diverging camming element 284 having a sloping portion 286 and a face portion 288, which is interconnected to flange portion 252 through a thin membrane 290.

[0043] Flange portion 252 is formed with a flexible outermost radial portion 292 which tapers radially outwardly. As illustrated, flange portion 252 preferably has a diameter which is at least three times the diameter of body portion 263. In addition, outermost radial portion 292 terminates in an annular tip 296 which, prior to insertion of mounting support 241 in a respective aperture 44, is arranged in a plane which extends through at least a portion of each finger grip member 280. More specifically, the plane extends through camming element 284 between face portion 288 and second portion 268 of body portion 263.

[0044] With this construction, body portion 263 can be placed through a respective aperture 44 until sloping portion 286 of each camming element 284 engage liner 17. At this point, sloping portion 286 will be progressively depressed, i.e. shift radially inwardly, as enhanced by the resiliency of thin membrane 290. At some point, outermost radial portion 292 of flange portion 252 will also abut liner 17. As outermost radial portion 292 is resilient and tapers, it can easily deflect, while simultaneously being biased against liner 17 so as to create a desirable seal. As mounting support 241 is continually pushed into aperture 44, outermost radial portion 292 will continue to deflect, with the full amount of deflection depending on the exact thickness of liner 17 which can fluctuate due to inherent tolerances in thermoforming procedures. In accordance with the most preferred form of the invention, each grip finger member 280 interferes with an edge of liner 17 in the order of 0.035-0.040 inches (0.09-0.10 cm). This flexing continues until face portion 288 directly abuts liner 17, at which point, the tapering and resilient outermost radial portion 292 is tightly sealed against liner 17.

[0045] Once each of mounting supports 241 is positioned in a corresponding aperture 44 in the manner described, liner 17 can be fully mounted inside cabinet shell 6 and the foamed insulation 32 can be injected and cured so as to solidify. As with the prior described embodiments, the foamed insulation 32 will actually extend into internal cavity 277 to rigidify and provide the necessary structural integrity for the overall shelf support arrangement. To this end, it should be realized that the insulation cannot enter freezer compartment 16 about mounting support 241 due to the sealing at outermost radial portion 292. In addition, it should be noted that each thin membrane 290 extends about three sides of a respective camming element 284 such that insulation 32 is also prevented from leaking into freezer compartment 16 through internal cavity 277.

[0046] From the above description, it should be readily apparent that each mounting support 41, 141 and 241 can be readily attached to liner 17 and retained in a desired position with a minimal amount of time and effort through the use of various types of adhesive or finger grip-type retainer elements. In the preferred embodiments, each mounting support 41, 141 and 241 is injection molded of plastic. Of course, various changes and/or modifications can be made to the structure and mounting of supports 41, 141 and 241 without departing from the spirit of the invention. In any event, the invention is only intended to be limited by the scope of the following claims.

Claims

1. In an appliance having an outer shell within which is positioned a compartment defining liner having at least opposing side walls spaced from the outer shell by an insulation zone and an aperture formed in one of the opposing side walls, a shelf mounting support arrangement comprising: a flange portion having first and second opposing sides and an outermost radial portion; a body portion projecting from the second side of said flange portion at a location spaced inwardly of the outermost radial portion, said body portion extending into the compartment, from the insulation zone, through the aperture formed in the liner; a plurality of retainer elements formed integral with the body portion, each of said retainer elements including a sloping portion and a face portion, wherein the sloping portion defines a camming surface which abuts the liner at the aperture to radially deflect the sloping portion during insertion of the body portion through the aperture, and wherein the liner is positioned between and engaged with both the face portion and the outermost radial portion of the flange portion; and insulation provided in said insulation zone, said insulation extending between the outer shell and the first side of the flange portion for retaining the mounting support in a shelf supporting position wherein the body portion projects into the compartment.

2. The shelf mounting support according to claim 1, wherein said body portion is formed with an internal cavity which opens into said insulation zone through said flange portion and is filled with the insulation which solidifies within the internal cavity.

3. The shelf mounting support according to claim 2, wherein said body portion includes an end wall, remote from said flange portion, which prevents the insulation from entering the compartment through the internal cavity.

4. The shelf mounting support according to claim 3, wherein said body portion includes an annular grooved portion, at a position spaced from the end wall in a direction opposite the flange portion.

5. The shelf mounting support according to claim 1, wherein each of said retainer elements further includes a thin membrane interconnecting the sloping portion to the flange portion.

6. The shelf mounting support according to claim 5, wherein the thin membrane extends about three sides of the sloping portion.

7. The shelf mounting support according to claim 6, wherein the thin membrane creates a seal between the sloping portion and each of the body portion and flange portion.

8. The shelf mounting support according to claim 1, wherein the outermost radial portion is resilient so as to deflect upon engagement with the liner following insertion of the body portion in the aperture.

9. The shelf mounting support according to claim 8, wherein the outermost radial portion is tapered relative to the remainder of the flange portion.

10. The shelf mounting support according to claim 1, wherein the outermost radial portion terminates in an annular tip which, prior to insertion of the body portion within the aperture, is arranged in a plane which extends through at least a portion of the plurality of retainer elements.

11. The shelf mounting support according to claim 10, wherein the plane extends through the sloping portion of each of the plurality of retainer elements.

12. The shelf mounting support according to claim 1, wherein the flange portion has a diameter which is at least three times an outer diameter of the body portion.

13. A method of providing a support for a shelf that extends between opposing side walls of a compartment defining liner positioned within an outer shell of an appliance with the side walls being spaced from the outer shell so as to define an insulation zone therebetween, said method comprising: forming a plurality of spaced apertures in each of the side walls of the liner; inserting a body portion of a shelf mounting support into a respective one of said plurality of spaced apertures until retainer elements provided on the body portion project through the liner and deflect radially outwardly on one side of the liner, while a flange portion of the shelf mounting support abuts an opposing side of the liner; and retaining the shelf mounting support in a desired position by providing insulation against the flange portion, between the liner and the outer shell.

14. The method according to claim 13, further comprising: forming the body portion with a grooved portion at a position spaced from the flange portion, with the grooved portion being adapted to receive a portion of the shelf.

15. The method according to claim 13, further comprising: foaming the shelf mounting supports in situ by injecting foamed insulation into the insulation zone, with the insulation flowing into the internal cavity.

16. The method according to claim 13, further comprising: deflecting a sloping portion of each retainer element through a camming operation with the liner upon inserting the body portion of the shelf mounting support into the aperture.

17. The method according to claim 16, further comprising: deflecting a thin membrane interconnecting the sloping portion to the flange portion as the body portion of the shelf mounting support is inserted into the aperture.

18. The method according to claim 13, further comprising: deflecting an outermost radial portion of the flange portion upon inserting the body portion of the shelf mounting support into the aperture.

19. The method according to claim 18, further comprising: creating a seal between the outermost radial portion and the flange portion when the shelf mounting support is attached to the liner.

20. The method according to claim 19, further comprising: locating an annular tip of the outermost radial portion in a plane which extends through the retainer elements prior to insertion of the body portion of the shelf mounting support into the aperture.