Abstract:
A shelf support including a rod portion and a seating portion extending therefrom is provided. The rod portion is adapted for fixing to a support wall. The seating portion includes a spiral-shaped outer surface which constitutes a plurality of support surfaces for supporting a bottom portion of a shelf, where, when the rod portion is fixed to the support wall and the bottom portion of the shelf is disposed above the seating portion, rotation of the shelf support causes a portion of the spiral-shaped outer surface to engage the bottom portion of the shelf.

Description:
FIELD OF THE INVENTION 
       [0001]    This invention relates to shelf supports having more than one support surface adapted for seating a portion of a shelf thereon, and more specifically to shelf supports adapted to allow a user to select a support surface to engage the portion of the shelf. 
       BACKGROUND OF THE INVENTION 
       [0002]    Shelves are commonly supported by three or more shelf supports or support brackets. A shelf support may be fixed to a support wall of a building or a piece of furniture, after which a portion of a shelf is brought to rest or seated on a support surface of the shelf support. 
         [0003]    In cases where (four) or more shelf supports are used, it is sometimes found that due to poor manufacturing of the support wall, bores formed therein and/or of the shelf supports, a shelf does not rest on one, or more, of the shelf supports and is spaced vertically therefrom, and/or that the shelf rests on the shelf supports in a non-level manner, and/or that the shelf is distanced horizontally from adjacent walls between which it is disposed. The above scenarios are undesirable and may cause instability of the shelf which may lead to flipping thereof or instability of the items placed on the shelf. To overcome some of the above-described problems varying types of shelf supports are known. 
         [0004]    EP 0,455,609 discloses a concealed support device to fasten a shelf to a wall, characterized in that it comprises: a plate designed to be fastened to a wall; a supporting arm longitudinally insertable in a housing provided in a shelf and having a hooking end oscillatably fixed to an engagement recess offered by the plate; an adjusting member comprising a cam element rotatably engaged to the arm and designed to act against said plate to restrain the angular displacement of the arm about the hooking end; and a vertical set screw operatively engaged to the plate and acting against the cam element so as to give the desired vertical positioning to the supporting arm. 
         [0005]    GB 2,124,892 discloses a device, used in conjunction with three other similar devices, comprising two components: a cylinder with a flanged end, the cylinder having a hole throughout its length in a position off centre through which a fixing screw fits; and a housing shaped to fit the cylinder and having support face onto which a horizontal surface can be fixed. 
         [0006]    U.S. Pat. No. 3,759,191 discloses a bracket for supporting cabinet shelves which is secured to the cabinet side wall and is rotatable angularly through 180 degrees between two positions. In one position, a pin on the bracket extends upwardly and is insertable in a shelf socket for releasably interlocking the shelf to the cabinet side wall. In the other position, the pin extends downwardly in a disengaged condition, permitting free separation of the shelf from the cabinet side wall. 
         [0007]    FR 2,878,297 discloses a support device for tablet, comprising a fixation nozzle with a threaded rod on the one hand, and a support nozzle in periphery from which a tablet is expected to be leant on, the said support nozzle comprising a non round or approximately round section and delimiting, in periphery, at least two support areas for tablet or other located at different distances in relation to the axis of the threaded rod. 
       SUMMARY OF THE INVENTION 
       [0008]    The disclosed subject matter refers to a shelf support which may be adapted for:
       closing a vertical gap which exists between the shelf support and an adjacent shelf portion;   leveling an inclined shelf resting on the shelf support; and   closing a horizontal gap which exists between a shelf and an adjacent wall portion.       
 
         [0012]    As per standard design, the shelf may require additional shelf supports to maintain a stable position. The additional shelf supports may be known shelf supports or shelf supports of the present invention. 
         [0013]    In accordance with a first aspect of the present invention there is provided a shelf support adapted to be mounted to a support wall via a bore preformed therein and to support a portion of a shelf thereon, the shelf support comprising a rod portion adapted to be mounted to the bore and a seating portion extending from the rod portion and comprising a spiral-shaped outer surface which constitutes a plurality of support surfaces for supporting the shelf, said support surface having a varying radial distance from the center of rotation of the rod portion about its longitudinal axis. The arrangement is such that rotating the shelf support about the rod portion results in varying radial displacement of a portion of the support surface supporting the shelf so as to engage a bottom surface of the shelf and/or facilitate its leveling. 
         [0014]    Each portion of the spiral-shaped outer surface may constitute a support surface upon which a shelf may be seated, therefore the shelf support comprises a plurality of support surfaces at varying distances allowing a user to fine tune the position of the shelf support by rotating it, thus bringing one of the support surfaces into contact with an adjacent portion of a shelf. This also allows a user to level a shelf already engaging the shelf support, for example in a case where bores to which shelf supports of a structure are of differing heights. 
         [0015]    Furthermore, each support surface on the spiral-shaped outer surface is disposed at a different distance or diameter to the other support surfaces from the center of the seating portion, thus the same diameter is not present twice, allowing for a large range of fine tuning. 
         [0016]    The support surface may be a smooth spiral surface or it may have shavings to form discrete flat support surfaces, to extend substantially flush under the supported surface of the shelf. 
         [0017]    The rod portion and the seating portion may be integrally formed. Alternatively the seating portion may have a central aperture and the rod portion may be mounted thereto and extend therefrom. 
         [0018]    To allow a shelf support of the present invention a greater magnitude of varying distances from the rod to the support surfaces, the rod may be disposed off centre with respect to the seating portion. The rod portion may have a smooth outer surface, allowing it to be easily rotated within a bore. 
         [0019]    The spiral shaped outer surface decreases moment of the shelf on the shelf-support and thus reduces the need for a rod portion to protrude completely through a wall to which it is mounted. As the rod portion may remain concealed within the wall unsightly protrusions on the other side of the wall, and external securing elements such as pins, nuts, etc are unnecessary. Consequently the rod portion also need not be secured to the bore via threaded engagement therewith and may be smooth, facilitating easy rotation thereof. 
         [0020]    The spiral pattern of the support surface may be formed according to different equations e.g. helical, exponential, etc. 
         [0021]    To prevent undesired rotation of a shelf support in accordance with the present invention, the seating portion may further comprise an anti-rotation element. Such anti-rotation element may be in the form of unidirectional teeth or bulges on an outer surface of a shelf support which constitute support surfaces thereof. Optionally, the seating portion may comprise a projection member extending parallel with respect to the rod portion, adapted to contact and cause friction with or even be inserted into a portion of a wall to which such shelf support is mounted. In the latter case rotation of the shelf support is prevented when the seating portion is pressed adjacent to the wall to which the shelf support is mounted. In other cases the shelf support may be rotated even while the seating portion engages the wall. 
         [0022]    To provide a lighter and more material-efficient structure, the seating portion may be hollow, with the spiral-shaped outer surface being connected to the rod portion by spokes. 
         [0023]    The seating portion may further comprise an axially-projecting lip, disposed adjacent to the rod portion. The lip may also constitute a plurality of support surfaces wherein, when the rod portion is mounted in the horizontal bore of a first wall and a side portion of the shelf is placed adjacent the lip, rotation of the shelf support causes the lip to engage the side portion of the shelf thereby pushing the shelf in a direction away from the first wall and towards an opposing wall. 
         [0024]    In accordance with another aspect of the present invention there is provided a shelf support adapted to be mounted to a bore formed within a support wall and to seat a shelf having a lower portion and a side portion thereon, the shelf support comprising a rod portion adapted to be rotatably mounted within the bore, and a seating portion extending therefrom; and comprising an axially-projecting lip disposed adjacent to the rod portion, the lip comprising an axial surface constituting a plurality of support surfaces; and when the rod portion is mounted in the bore and the side portion of the shelf is placed adjacent the lip, rotation of the shelf support causes the axial surface to contact the side portion of the shelf. 
         [0025]    In accordance with either of the above aspects, the axial projection of the lip may have a uniform tapered shape or may follow a growth pattern such as helical, exponential or step growth, etc. 
         [0026]    A shelf support comprising the above-described axially-projecting lip can serve to secure a shelf mounted thereon in a horizontal plane by pushing it against an opposing wall, thereby preventing flipping and further securing the shelf in a desired position. Additionally, as a result of the above described pushing action, the axially-projecting lip acts as an anti-slip element, as will be explained hereinafter. 
         [0027]    Shelf supports in accordance with the above aspects which comprise a spiral-shaped seating portion may also be used in an alternative manner, by disposing a seating portion of the shelf support underneath a corner of a shelf, and allowing the shelf s corner to press down on a portion of the spiral-shaped outer surface thereby causing the shelf support to rotate until an edge of the spiral-shaped outer surface contacts a side-portion of the shelf. This motion may cause the shelf to be pushed towards an opposing wall, thus securing the shelf support and the shelf itself in position. 
         [0028]    In accordance with yet another aspect of the present invention there is provided a shelf support adapted to be mounted to a support wall via a bore preformed therein and to support a portion of a shelf thereon, the shelf support comprising: a seating portion and a rod portion extending therefrom; the seating portion comprising a symmetrically-shaped cross section having an outer surface which constitutes a plurality of support surfaces for supporting the shelf; the rod portion being disposed off-center relative to the symmetrically-shaped cross section and adapted to be mounted to the bore. The cross section may be in the shape of a circle, square, hexagon, etc. 
         [0029]    Rotation of such shelf support about the off-center rod portion results in varying radial displacement of a portion of the support surface supporting the shelf so as to engage a bottom surface of the shelf and facilitate its leveling. Thus fine-tuning is accomplished without such being visible to a casual onlooker. 
         [0030]    In accordance with any of the above aspects a seating portion of the shelf support may be formed with a tool engaging portion e.g. a recess adapted to allow insertion of a tool head therein such as a screw driver, spanner, key, etc, for ease of rotation thereof. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0031]    In order to understand the invention and to see how it may be carried out in practice, embodiments will now be described, by way of non-limiting examples only, with reference to the accompanying drawings, in which: 
           [0032]      FIG. 1A  is a schematic front view of a shelf support according to one embodiment of the present invention; 
           [0033]      FIG. 1B  is a schematic side view of the shelf support in  FIG. 1 ; 
           [0034]      FIG. 1C  is a schematic side view of the shelf support of  FIG. 1 , mounted to a wall and disposed beneath a shelf; 
           [0035]      FIG. 1D  is a schematic front view of the assembly of  FIG. 1C ; 
           [0036]      FIG. 1E  is a schematic front view of the shelf support, wall and shelf in  FIGS. 1C and 1D , with the shelf support rotated clockwise about 200 degrees; 
           [0037]      FIG. 1F  is a schematic front view of the shelf support of  FIG. 1 , mounted to a wall and disposed beneath a shelf which is resting thereon; 
           [0038]      FIGS. 2A and 2B  are a schematic front view of embodiments of a shelf support comprising an anti-rotation element; 
           [0039]      FIG. 2C  is a schematic side view of yet another embodiment of a shelf support comprising an anti-rotation element, partially mounted to a wall; 
           [0040]      FIG. 2D  is a schematic side view of the shelf support in  FIG. 2C , mounted to a wall; 
           [0041]      FIG. 3A  is a schematic front view of another embodiment of a shelf support comprising radial support spokes; 
           [0042]      FIG. 3B  is a schematic side view of an embodiment of a shelf support comprising an off-centre rod portion and having a circular-shaped seating portion; 
           [0043]      FIG. 3C  is a schematic front view of various example alternate shapes for the seating portion of the shelf support in  FIG. 3B ; 
           [0044]      FIG. 3D  is a schematic front view of an embodiment of a shelf support comprising an outer surface with a non-spiral shaped portion; 
           [0045]      FIG. 3E  is a schematic front view of another embodiment of a shelf support having an outer surface formed with discrete flat support surfaces; 
           [0046]      FIG. 4A  is a schematic front view of an embodiment of a shelf support comprising an axially-projecting lip; 
           [0047]      FIG. 4B  is a schematic side view of the shelf support of  FIG. 4A ; 
           [0048]      FIG. 4C  is a schematic side view of the shelf support of  FIG. 4B , mounted to a wall and disposed beneath a shelf; 
           [0049]      FIG. 4D  illustrates the shelf support of  FIG. 4C  rotated about 270 degrees in a counterclockwise direction; 
           [0050]      FIG. 4E  is a schematic front view of another embodiment of a shelf support comprising an axially-projecting lip; 
           [0051]      FIG. 5A  is a schematic front view of yet another embodiment of a shelf support comprising an axially-projecting lip; 
           [0052]      FIG. 5B  is a schematic side view of the shelf support of  FIG. 5A ; 
           [0053]      FIG. 5C  is a schematic front view of a shelf, side wall and back wall of a cupboard and the shelf support illustrated in  FIGS. 1A-1E ; 
           [0054]      FIG. 5D  is a schematic front view of the items in  FIG. 5C  and the shelf support illustrated in  FIGS. 5A and 5B ; and 
           [0055]      FIG. 5E  is a schematic front view of the items in  FIG. 5D  with the shelf support illustrated in  FIGS. 5A ,  5 B and  5 D, rotated counterclockwise. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0056]    Referring now to the drawings wherein like reference characters designate like or corresponding parts throughout several views, there is shown in  FIGS. 1A-1E , a shelf support generally designated  10  according to one embodiment of the present invention. 
         [0057]    Drawing attention first to  FIGS. 1A and 1B , the shelf support can be seen to have a substantially cylindrical shape and comprises a cylindrically-shaped rod portion  12  having a smooth outer surface and a central axis X, and a seating portion  14  extending from the rod portion  12 . Optionally, the rod portion  12  and the seating portion  14  are integrally formed with each other and are made of a plastic material, which is of sufficient strength to support a standard shelf  16  ( FIGS. 1C-1E ), when the shelf support  10  is mounted to a side-wall  18  (best seen in  FIG. 1C ). 
         [0058]    The seating portion  14  comprises a spiral-shaped outer surface  20 . 
         [0059]    Each point of the outer surface  20  along the spiraling portion thereof is disposed at a different distance from the central axis X. To elaborate, example points of the outer surface designated A, B and C are shown to constitute potential support surfaces of the shelf support, wherein diameter D 1 &lt;D 2 &lt;D 3 . 
         [0060]    It should be noted, however, that the outer surface  20 , further comprises a radially oriented straight portion  21  (seen in  FIGS. 1A ,  1 D and  1 E), which connects the support surface having the largest diameter to the support surface having the smallest diameter. 
         [0061]    For ease of rotation, the seating portion is optionally formed with a recess  22 , which, in this example, is shaped to allow insertion of a screw driver with a slotted tip (not shown). 
         [0062]    Turning attention to  FIGS. 1C and 1D , the shelf support  10  is shown to be rotatably mounted via the rod portion  12  thereof to a horizontal bore  24  ( FIG. 1C ) formed within the wall  18 . The seating portion  14  is disposed underneath a lower portion  26  of a shelf  16  which is supported in this position by other shelf supports (not shown). Notably, the shelf is level due to the presence of other shelf supports (not shown) but is unstable due to there being a gap or distance (designated as E) between the shelf and support surface A, which is the closest support surface to the lower portion  26  of the shelf  16 . Notably, distance E corresponds in magnitude to the difference of magnitude between diameters D 1  and D 2 , the importance of which will become clear hereinafter. 
         [0063]    In operation, to stabilize the shelf  16 , such that it is seated on the shelf support  10 , a user inserts a screw driver tip (not shown) into the recess  22  and rotates the shelf support thereby in the direction of arrow  28  ( FIG. 1D ) about the central axis X until the orientation of the shelf support is that shown in  FIG. 1E , at which point the lower portion  26  of the shelf  16  securely rests on support surface B. 
         [0064]    Drawing attention now to  FIG. 1F , the shelf support  10  is shown disposed underneath a lower portion. 26  of a shelf  16  which is supported in this position by other shelf supports (not shown). In contrast to  FIGS. 1C and 1D  the shelf  16  shown in  FIG. 1F  is not level and is resting on the shelf support  10 . To aid visualization only, a horizontal axis designated H and a vertical axis designated V are shown. 
         [0065]    The operational steps to level the shelf  16  are similar to those described above, with the shelf support  10  being rotated about 250 degrees in a clockwise direction. 
         [0066]    During rotation the shelf support  10  continuously contacts and pushes the shelf  16  until the shelf is acceptably leveled, for example until it is parallel with horizontal axis H, in a manner similar to that shown in  FIG. 1E . 
         [0067]    It should be noted that the above described scenarios are examples only and, for example, a shelf support may be at any orientation with respect to a shelf thereabove and may be rotated any appropriate amount, and to any point on the outer surface  20  to bring the shelf to a desired inclination. 
         [0068]    Turning to  FIGS. 2A-2D , examples of shelf supports having anti-rotation elements, for ensuring the prevention of undesired reverse rotation of a shelf support, are shown. 
         [0069]    In  FIG. 2A  a shelf support designated as  30  comprises an anti-rotation element in the form of unidirectional teeth  32  formed on an outer surface of the shelf support  30 . 
         [0070]    The teeth  32  act to prevent the shelf support, when in contact with a lower portion of a shelf (not shown), from rotating in the direction opposite to arrow  28 . 
         [0071]    Similarly,  FIG. 2B  shows a shelf support designated as  34  comprising an anti-rotation element in the form of bulges  36 . 
         [0072]      FIGS. 2C and 2D  show a shelf support designated as  42  comprising an anti-rotation element in the form of an axial projection member  44 , optionally made of a rubber material, extending from the seating portion  14  and parallel with respect to the rod portion  12 . 
         [0073]    In operation, to stabilize a shelf (not shown) disposed above the shelf support  42 , a user rotates the shelf support to an orientation where it engages the shelf, while the rod portion  12  of the shelf support  42  is not fully inserted into the bore  24 , as seen in  FIG. 2C . When the desired orientation is reached, the user fully pushes the shelf support  42  towards the wall  18 , as shown in  FIG. 2D , wherein further rotation of the shelf support  42  is arrested by the frictional contact of the axial projection member  44  with the wall  18 . As should be understood, there may be a plurality of axial projection members, which may have any desired shape and may be made of any material which can produce the desired frictional effect. 
         [0074]    Alternatively the axial projection member  44  may be made of a hard material, for example, steel and may be sharp enough to be inserted into a portion of a wall to which such shelf support is mounted, thereby preventing further rotation of the shelf support. 
         [0075]    It should be noted that in all cases a shelf support of the present invention is able to be freely rotatable in at least one direction whilst at least partially mounted to a bore formed within a wall. 
         [0076]    Referring to  FIGS. 3A-3E , other modifications of a shelf support in accordance with the present invention are shown. 
         [0077]      FIG. 3A  illustrates a shelf support  46  with a hollow seating portion, wherein the spiral-shaped outer surface  48  is supported to the rod portion  12  via radial support spokes  50  engaging both. 
         [0078]      FIG. 3B  illustrates a shelf support  52  comprising a circular shaped seating portion  14  and an off centre rod portion  12 , i.e. a rod portion that is not aligned with the central axis X. 
         [0079]      FIG. 3C  illustrates various schematic front views of example alternate shapes for the seating portion of the shelf support in  FIG. 3B . Notably the shape may be any symmetrical shape or perfected polygon. 
         [0080]      FIG. 3D  illustrates a shelf support  54  similar to that shown in  FIGS. 1A-1E , comprising an outer surface with a non-spiral shaped curved portion  56  instead the straight portion  21  of shelf support  10 . It should be understood that, due to manufacturing realities, small percentages of an outer surface of a shelf support such as the curved portion  56  and the straight portion  21  may have a non-spiral-shape, while not departing from the spirit of the invention. 
         [0081]      FIG. 3E  illustrates a shelf support designated as  38  comprising shavings to form discrete flat support surfaces  40 , to extend substantially flush under the supported surface of a shelf. Notably the shavings  40  function in a slightly different manner to the unidirectional teeth  32  and bulges  36  shown in  FIGS. 2A and 2B , respectively, in that the shavings provide a flat surface for a shelf to rest on thereby removing any incline for a shelf to slip on. Therefore, for slippage to occur a shelf resting on shelf rest  38  would need to overcome an edge or apex  41  by first distancing itself from the shelf rest  38 . 
         [0082]    Turning attention to  FIGS. 4A and 4B , there is illustrated a shelf support, generally designated as  60 . The shelf support  60  comprises a cylindrically-shaped rod portion  12  with a smooth outer surface and a seating portion  62  extending therefrom. 
         [0083]    The seating portion  62  comprises a cylindrical section  64 , and an axially-projecting lip  66  disposed between the cylindrical section  64  and the rod portion  12 . 
         [0084]    The lip  66  is of a roughly helical-shape lip and comprises a front axial surface  68 , a rear axial surface  70 , a side surface  72 , a first end  74  (best seen in  FIG. 4A ) and a second end  76  which extends from the first end  72  around approximately three quarters or 270 degrees of the cylindrical section  64 , along which it axially projects in a gradually growing pattern in a direction away from the rod portion  12 . The axial projection of the lip at the second end  76  has a magnitude denoted by the letter F ( FIG. 4D ), the significance of which will become clear hereinafter. 
         [0085]    One use of the shelf support  60  will now be described with reference to  FIGS. 4C and 4D . 
         [0086]    In  FIG. 4C  the rod portion  12  of shelf support  60  is mounted to a horizontal bore  24  formed within a first side-wall  80  of a cabinet (partially seen). Mounted on the cylindrical section  64  of the shelf support  60  is a portion of a shelf  82 . As can be understood, other portions of the shelf  82  may be supported by additional shelf supports (not shown). Notably a first side-face  84  of the shelf  82  is adjacent the first side-wall  80  of the cabinet with the first end  74  of the lip  66  wedged there between, and a second side-face  86  of the shelf  82  is adjacent a second side-wall  88  of the cabinet, spaced therefrom by a distance of magnitude F. 
         [0087]    Turning attention to  FIG. 4D , after a user rotates the shelf support  60  counterclockwise by about  270  degrees, the portion of the lip  66  wedged between the first side-face  84  of the shelf  82  and the first side-wall  80  grows, pushing the shelf  82  towards the second side-wall  88 , closing the gap therebetween and thus securing the position of the shelf  82 . 
         [0088]    A further result of the pushing motion is that the shelf support itself is thrust towards the adjacent wall to which it is mounted. Thus the axially-projecting lip also functions as an anti-slip element, preventing the shelf support from being rotated in an undesired direction by moment applied thereon from the adjacent shelf. Therefore there is no need for an anti-slip element, or any securing or locking element. Notably all components of a shelf support of this kind do not protrude and are not visible on the other side of a wall to which the shelf support is mounted. 
         [0089]    It should be noted that the axially projecting surface described above may follow any acceptable growth pattern, so as to accomplish the above described function. For example, such shape may also be comprised by an exponential or step growth, etc. It should also be noted that the first end and second end of such a lip may be disposed at different points and extend along different percentages of a seating portion, and also may axially extend in a clockwise direction, as opposed to the counterclockwise direction of growth shown in  FIGS. 4A-5E , as long as a growth pattern is present to provide the above described gap-closing function. 
         [0090]    Alternatively the axially projection of the lip may have a uniform tapered shape as illustrated in  FIG. 4E  by a shelf support, generally designated as  200 . 
         [0091]    The shelf support  200  comprises a cylindrically-shaped rod portion  12  with a smooth outer surface and a seating portion  202  extending therefrom. 
         [0092]    The seating portion  202  comprises a cylindrical section  204 , and an axially-projecting lip  206  disposed between the cylindrical section  204  and the rod portion  12 . 
         [0093]    The cylindrical section is formed with a radial recess  208  which is designed for engagement with a spanner (not shown) via which a user may turn the shelf support  200  to a desired orientation. 
         [0094]    The lip  206  does not follow a growth pattern but has a uniform tapered shape around the diameter of the shelf support  200 . The lip  206  is formed with an aperture  210  designed for insertion of a key (not shown) via which a user may turn the shelf support  200  to a desired orientation. 
         [0095]    Notably the sizes and positions of the radial recess  208  and aperture  210  may vary according to design preference. 
         [0096]    Referring now to  FIGS. 5A and 5B , a shelf support generally designated  90  is shown. The shelf support  90  is similar to the shelf support  60  except that the seating portion  92  comprises a first portion  93  having a spiral-shaped outer surface  94  with a straight portion  21 , and a second portion constituted by an axially-projecting lip  96  having a first end  98  (best seen in  FIG. 5A ) and a second end  100  which extends from the first end  98  around approximately half or  180  degrees of the spiral-shaped outer surface  94 . 
         [0097]    While the shelf support  90  may be used in the manner described above for the previous embodiments, an alternative use will now be described therefor, with reference to  FIGS. 5C-5E  which illustrate the assembly of a cabinet (partially shown) comprising a back wall  100 , a first side wall  102  disposed perpendicular to and adjacent the back wall  100 , a second side wall disposed opposite to the first side wall (not shown) and a shelf  104 . 
         [0098]      FIG. 5C  shows the shelf  104  partially mounted on a shelf support  10 , with the shelf  104  slanted upward slightly so that a bore  106 , formed with the first side wall  102 , is visible. 
         [0099]    In  FIG. 5D  the shelf support  90  has been mounted to the bore  106 , with the shelf  104 , still slightly non-level, being brought to rest on a portion of the spiral shaped outer surface  94  thereof. Notably a small portion of the first end  98  of the axially-projecting lip  96  is disposed between the first side wall  102  and the shelf  104 . 
         [0100]    In  FIG. 5E  the shelf support  90  has been rotated counterclockwise, i.e. in the direction of arrow  108 , until the straight portion  21  of the spiral-shaped outer surface  94  contacts an adjacent side-portion  110  of the shelf  104 . This single rotational movement of the shelf support  90  results in the following:
       leveling of the shelf  104 , as the shelf now rests on a portion of the spiral-shaped outer surface  94  having a smaller diameter than the portion which it was shown to rest on in  FIG. 5D ;   pushing/securing the shelf  104  against the back wall  100 , via the contact of the straight portion  21 ;   the combination of the downwards force of the shelf  104  on the outer surface  94  caused by gravity and the contact of the shelf  104  with the straight portion  21 , causes a self-locking motion, wherein the shelf  104  arrests the shelf support  90  from further rotation; and   pushing/securing the shelf  104  away from the first side wall  102  towards the opposing second side wall (not shown), via the lip  96  in a manner similar to that described with reference to  FIGS. 4B and 4D .       
 
         [0105]    Those skilled in the art to which this invention pertains will readily appreciate that numerous changes, variations and modifications can be made without departing from the scope of the invention mutatis mutandis.