Abstract:
A slope adjustable head for an adjustable pedestal ( 10 ) for supporting beams, panel members, typically pavers, in accurate edge aligned relation, in a level plane is disclosed. The pedestal ( 10 ) includes a base block ( 12 ) and a series of inter-engaging threaded annular elements ( 20, 30 ) which can be rotated relative to each other to adjust the height of the top of the pedestal in a screw jack fashion. A slope compensator is located at the top of the pedestal and comprises a slope compensation plate ( 100 ) and a head member ( 50 ). The head member ( 50 ) defines a concave surface having a defined radius of curvature. The slope compensation plate ( 100 ) defines a corresponding convex surface having the same radius of curvature and sits on top of the head member. The pedestal ( 10 ) is calibrated to allow adjustment for typically zero to five percent in one percent increments. The top member defines a central aperture ( 56 ) and a series of holes ( 72 ) arranged in a spiral around the central aperture. The adjustment member defines a depending central cylindrical portion ( 110 ) which locates in the central aperture ( 56 ) and two diametrically opposed depending pegs ( 132, 134 ) spaced either side of the central cylindrical portion which locate in the holes of the top member. Rotation of the slope compensation plate ( 100 ) about its centre of curvature causes the angle of the adjustment plate relative to the vertical axis to change thus allowing for compensation for the slope of the surface on which the pedestal is standing.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a continuation-in-part of PCT/AU2006/001613 which claims priority from Australian Provisional Patent Application No 2005905990 filed on 28 Oct. 2005, the contents of both applications being incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    This invention relates to a slope compensator for a pedestal for elevated floors. 
       BACKGROUND OF THE INVENTION 
       [0003]    It is known to provide elevated or raised floors, also known as pedestal floors. Elevated flooring incorporates a number of height adjustable pedestals which are uniformly distributed over a subsurface/sub floor such as a concrete floor of a multi-story building, a roof, terrace, or any other surface on top of which it is desired to locate an elevated floor. Other non-exhaustive applications of pedestal floors include technical floors for laboratories, fitting out old buildings, patios, balconies, swimming pool surrounds and decking. The pedestals cooperate in supporting floor panels, such as pavers, or other floor surfaces. The panel members provide a relatively flat high strength floor. 
         [0004]    Problems arise when forming a raised surface on a sub floor/subsurface which is not itself horizontal such as roof terrace which will typically slope at an angle of up to 5% in order to allow water run off. 
         [0005]    Although height adjustable pedestals with means for compensating for slope, are known to address the problem of slope, existing pedestals incorporating slope adjustment tend to be rather awkward to use and adjust. One common problem with existing systems is that where slope compensation is provided, it may not always be immediately apparent which direction the head of the pedestal should face, relative to the slope of the subsurface. 
         [0006]    One further problem with existing pedestal jacks is stability of the pedestals and this is a problem which is currently and somewhat unsatisfactorily addressed by tying wire to the pedestals which is awkward messy and does not work well. 
         [0007]    Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is solely for the purpose of providing a context for the present invention. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application. 
       SUMMARY OF THE INVENTION 
       [0008]    According to the present invention, there is provided an adjustable pedestal adapted to support panel members of an elevated floor structure comprising:
       a height adjustable support structure including a base and a head assembly, the base defining a plane on which the support structure stands in use, said head assembly including:   a head member; and   a slope adjustment plate,   wherein the head member defines a first part-spherical, typically concave, surface having a first radius of curvature, and the slope adjustment plate has a first face defining a planar area and an opposite face defining a second part-spherical, typically convex, surface having substantially the same radius of curvature as the first surface, and wherein the part spherical convex surface may be supported on the part spherical concave surface, with relative movement of the convex surface on the concave surface adjusting the angle of the planar portion of the adjustment plate relative to the plane of the base, the head member and slope adjustment plate defining co-operating fixing means for fixing the slope adjustment plate relative to the head member in two or more different relative orientations.       
 
         [0013]    The use of two spherical surfaces to provide slope compensation, allows for a relatively straightforward adjustment of the slope of the adjustment plate by rotation of the adjustment plate about the centre of curvature of its convex surface. 
         [0014]    In a particularly preferred embodiment, the slope adjustment plate defines at least one depending peg and the head member defines an array of holes for receiving the peg and which extend about the centre of the top surface of the head member. In this preferred embodiment, the holes are not equidistant from the centre of the head member but rather are located on a gentle spiral curve to account for relative movement of the adjustment plate on the head member. 
         [0015]    Most preferably, a relatively large circular aperture is defined in the centre of the head member and a semi-circular skirt portion depends from the circumference of the aperture. A relatively smaller circular aperture is also defined in the centre of the adjustment plate. A larger diameter circular skirt portion depends down from the convex (underside) of the slope adjustment plate encompassing the aperture and whose centre is offset from the centre of the aperture in the plate. A projecting tab extends outwardly from the base of the circular skirt. 
         [0016]    The apertures in the adjustment plate allows an installer of a pedestal floor to adjust the relative orientation of plate and head member by inserting their finger or thumb in the aperture, raising, rotating and lowering the plate. The projecting tab and semi-circular skirt assist in preventing mis-assembly and maladjustment of the head assembly. 
         [0017]    In order to provide a pedestal having sufficient strength and load bearing area, it is preferred that both the head member and the slope adjustment plate define further part spherical surfaces which bear against each other in use to distribute loads. In particular the edge area of the head member may define a further part spherical surface which extends in a ring around the perimeter of the head member. The further part-spherical surface is concentric with the centre of curvature of the first concave part-spherical surface but had a larger radius of curvature. Similarly the edge area of the slope adjustment plate defines a part spherical convex surface which extends in a ring around the perimeter of the plate, which is concentric with the centre of curvature of the second convex part-spherical surface but had a larger radius of curvature. This arrangement provides a second load bearing at the outer edges of the plate and head member, in addition to the first and second concave and convex surfaces which share any load carried by the pedestal. 
         [0018]    An annular flange and a series of radially extending support ribs may extend between the first concave surface of the head member and the concave outer ring and a series of through holes may be defined in the flange to prevent the build up of water in the head member. 
         [0019]    The adjustment plate is typically generally circular in plan view. Preferably, the top of the adjustment plate is marked with a cross passing through the centre of the plate, typically in the form of a relatively shallow groove. At each end of the cross a short arm may be defined which protrudes beyond the circumference of the top surface of the adjustment plate. The arm may define a hole for tying wire, string or the like to the pedestal. 
         [0020]    One line/arm of the cross is preferably clearly marked with an arrow and “UP SLOPE” or the like to indicate that, in use, the arrow/arm should point in the upward direction of the slope of the sub floor. 
         [0021]    In a preferred embodiment, a series of apertures typically six, are defined in the slope adjustment plate. The apertures may have particular shape, e.g. triangular, and a correspondingly shaped protrusion projects up from the head member and slots through into one of the six apertures. The degree of slope compensation (typically 0% to 5%, in one percent increments) provided by the head assembly is indicated by which aperture the protrusion is located in. The protrusion is most preferably in a contrasting colour to the colour of the slope compensation plate. The numbers zero to five are typically defined on the adjustment plate adjacent the aperture providing that percentage of slope compensation. 
         [0022]    To provide a combination of light weight and sufficient strength, the pedestal is typically injection moulded in a plastics material such as polypropylene, however other suitable materials or manufacturing methods could be used. 
         [0023]    In a related aspect, the present invention provides a slope adjustable head for an adjustable pedestal adapted to support panel members of an elevated floor structure the head comprising:
       a head member; and   a slope adjustment plate,   wherein the head member defines a first part-spherical, typically concave, surface having a first radius of curvature, and the slope adjustment plate has a first face defining a planar area and an opposite face defining a second part-spherical, typically convex, surface having substantially the same radius of curvature as the first surface, and wherein the part spherical convex surface may be supported on the part spherical concave surface, with relative movement of the convex surface on the concave surface adjusting the angle of the planar portion of the adjustment plate relative to the plane of the base, the head member and slope adjustment plate defining co-operating fixing means for fixing the slope adjustment plate relative to the head member in two or more different relative orientations.       
 
         [0027]    In a yet further aspect the present invention provides an adjustable pedestal adapted to support panel members of an elevated floor structure comprising:
       a height adjustable support structure including a base, a head assembly for supporting a panel member or the like, defining a plane on which the support structure stands in use, and at least one spacer element located between the base and the head assembly, wherein   the base defines an open top and is internally threaded to receive a lower part of the spacer element, which is externally threaded to engage with the internally threaded portion of the base such that relative rotation of the two adjust the height of the pedestal and characterised by a locking ring which is located on the externally threaded portion of the spacer element which may be rotated to move it into contact with the top of the base or another spacer element if more than one are present, to reduce or prevent relative movement of the base and spacer elements.       
 
         [0030]    The locking elements have the advantage of considerably increasing the stability of the pedestal. 
         [0031]    The head assembly may further include a head member; and a slope adjustment plate embodying previously described aspects of the invention. 
         [0032]    In order to provide further improvements in stability, in a yet further aspect the present invention provides an adjustable pedestal adapted to support panel members of an elevated floor structure comprising:
       a height adjustable support structure including a base, a head assembly for supporting a panel member or the like, defining a plane on which the support structure stands in use, and at least one spacer element located between the base and the head assembly, and wherein the base defines an open top and is internally threaded to receive a lower part of the spacer element, which is externally threaded to engage with the internally threaded portion of the base such that relative rotation of the two adjust the height of the pedestal and characterised by the base and interior of the spacer element being substantially open thereby allowing relatively large materials of a diameter of around 8 mm, typically 10 mm or 20 mm or more to pass unhindered from the top of the spacer element to its bottom and thereby allowing such materials to pass down the pedestal with the head assembly removed, to the base of the pedestal.       
 
         [0034]    The adjustable pedestal may be filled with ballast at least some of which has a diameter of 8 mm or more, or 1 cm or more, or 2 cm or more or larger up to the narrowest part of the internal diameter of the spacer portion which is about 80 mm. 
         [0035]    The adjustable pedestal may be filled with concrete to create a concrete pillar enclosed by the pedestal for improved strength and durability. 
         [0036]    Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0037]    A specific of the present invention will now be described, by way of example only, and with reference to the accompanying drawings in which: 
           [0038]      FIG. 1  shows a view of a height adjustable pedestal embodying the present invention; 
           [0039]      FIG. 2   a  is an exploded view seen from one side and above of the height adjustable pedestal of  FIG. 1 ; 
           [0040]      FIG. 2   b  is an exploded view seen from one side and below of the height adjustable pedestal shown in  FIG. 1 ; 
           [0041]      FIG. 3  is a isometric view of the top of a slope adjustment plate of the height adjustable pedestal; 
           [0042]      FIG. 4  is an isometric view of the underside of slope adjustment plate of  FIG. 3 ; 
           [0043]      FIG. 5  is a isometric view of the top of a head member of the pedestal shown in  FIG. 1 ; 
           [0044]      FIG. 6  is an isometric view seen from above of an assembly of the slope compensator plate of  FIG. 3  and the head member of  FIG. 5 ; 
           [0045]      FIG. 7  is a side view of the assembly of  FIG. 6  showing 0% compensation; 
           [0046]      FIG. 8  is a side view of the assembly of  FIG. 6  showing 5% slope compensation; 
           [0047]      FIG. 9  is an underneath plan view of the assembly shown in  FIGS. 6 to 8 ; 
           [0048]      FIG. 10  is a cross section through the assembly also showing a paver spacer; 
           [0049]      FIG. 11  is an exploded isometric sectional view of the slope adjustment plate and head member of  FIG. 10 ; 
           [0050]      FIG. 12  is a section through a pedestal embodying the invention; 
           [0051]      FIG. 12   a  shows the sectioned pedestal containing ballast; 
           [0052]      FIG. 12   b  shows the sectioned pedestal containing concrete; and 
           [0053]      FIG. 13  shows a cross-section through a variant of a paver separator; and 
           [0054]      FIG. 14  shows a cross-section through a variant of a slope adjuster plate. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0055]    Referring to the drawings,  FIG. 1  shows a height adjustable pedestal  10  incorporating slope adjustment, embodying the present invention comprising a number of components which can also be seen in the exploded views  2   a  and  2   b . The height adjustable pedestal comprises a base element  12  comprising a circular planar base plate  14  defining a plane on which the pedestal stand in use, and an annular cylindrical portion  16  extending upwards from the base. The base is rimless to minimise collection of water. A series of holes  17  are defined in the base for bolting, or otherwise fixing, the base to a substrate. The cylindrical portion  16  is internally threaded. A series of generally triangular buttresses/webs  18  extend from the base plate  14  to the outer face of the cylindrical portion  16 . Drainage holes  19   a  are also provided for drainage between the vertical webs to prevent build up of water, particularly when the base is inclined.  FIG. 2   b  also shows drainage channels  19   b  which extend from the holes  19   a  to the rim so that any water which collects on the underside of the base can run out. 
         [0056]    As shown in  FIG. 1  an externally threaded cylindrical first spacer element  20  is threadably engaged in the base element. As is best seen in  FIGS. 2   a  and  2   b , the first spacer element has an annular cross section and a generally open base  22 . The upper part of the interior of the spacer element is threaded. At the top of the spacer element there is an external flange  24  from which extend a series of projecting lugs  26  which define apertures to enable wire to be threaded therethrough. An annular locking ring  21  is threadably engaged on the external threading of first spacer element  20  and can be rotated to move up and down the threading. The locking ring  21  defines a number of protruding lugs  21   a  which can be grasped to turn the locking ring. When the locking is moved down so that it abuts the top of the base element  12 , the contact/interference between the two create stability and prevent wobble of the first spacer element  20  within the base element  12 . 
         [0057]    A locking ring  28  is provided to prevent unintentional rotation of the first spacer element relative to a further cylindrical spacer element  30  which is threadably engaged in the first spacer element  20 . The locking ring defines projecting lugs  28   a  which define holes through which wires or the like may be threaded, if desired. The locking ring may be rotated to move it up or down the external threading of the spacer element  30 . When it is moved down so that it abuts the flange  24  of the spacer element  20 , the contact/interference between the two create stability and prevent wobble of the spacer element  30  within the spacer element  20 . 
         [0058]    The further spacer element  30  has a generally annular cross section comprising a lower portion  32  which is externally threaded and configured to locate inside the spacer element  20  and an upper, larger diameter portion  34 , which is internally threaded. The base of the spacer element is substantially open. 
         [0059]    A further locking ring  28  is disposed between a head portion  50  which will be described in more detail below but includes an upper portion  52  and a depending externally threaded cylindrical portion  54  which is threadably engaged inside the threaded portion  34 . A slope compensator plate  100  locates on top of the upper portion of the head portion  50  which again will be described in greater detail below. A cruciform paver separator  150  snap fits into an aperture  110  in the upper portion of the slope adjuster plate. 
         [0060]    The pieces together form a telescopic height adjustable jack which can range in height from a minimum of around 60 mm up to approximately 1050 mm. For a pedestal having the lowest possible height the further spacer element  30  is omitted and the head member is threaded directly into the first spacer element  20 . Height adjustment is obtained by relative rotation of the head member  50  inside the first spacer element and of the first spacer element  20  inside the base. 
         [0061]    When greater height is required the spacer member  30  is used as shown in  FIG. 1 . Two or more spacer elements  30  could be used where yet further height is required. 
         [0062]    In use, a grid of intersecting parallel string lines may be set out on top of a subsurface/sub floor on which a pedestal floor is to be located. The spacing between the string lines will correspond to the width of the floor panel members, such as pavers allowing for any slight gaps between the panel members. A pedestal is placed at each intersection. The height of the pedestals is adjusted to compensate for any slope on the underlying sub floor so that the pedestal floor may be horizontal, if desired. However, it will be appreciated that if the head of the pedestal were perpendicular to the vertical axis of the pedestal, i.e. parallel to the base the pavers will not sit evenly on the pedestals. Accordingly, it is necessary to provide slope compensation as well as height adjustment for the pedestal to account for those circumstances in which the sub-floor is not horizontal but is sloping. 
         [0063]      FIGS. 3 to 11  illustrate the features of the slope compensating head assembly of the present invention. As discussed above, the assembly comprises two components, a slope compensation plate  100  shown in  FIGS. 3 and 4  and a head member  50  shown in  FIG. 5 . 
         [0064]    The head member, best seen in  FIG. 5 , comprises a head portion  52  from which depends an annular externally threaded cylindrical portion  54 . In the centre of the head portion  52  there is a circular aperture  56 . Extending around the circular aperture  56  is a first part spherical surface  58  which extends between the perimeter/circumference of the circular aperture  56  and a concentric circle  60 . A flange  62  extends from the perimeter of the convex surface to a circular inside perimeter of a further or outer part spherical concave surface  64  in the form of a band which extends in a band/ring around the head member. The flange is recessed slightly relative to the outer edge of the first part spherical surface  58 . A series of radially aligned strengthening ribs  66  extend across the flange from the perimeter/circumference of the circular aperture  56  to the further part spherical surface  64 . A series of drainage holes  67  are formed in the flange between adjacent pairs of ribs to prevent build up of water. 
         [0065]    A semi-circular skirt portion  68  (also seen in  FIG. 9 ) depends from the circumference of the aperture  56 . 
         [0066]    A post  70  having a generally triangular cross-section extends up from the head member approximately where the flange and outer part spherical surface meet. 
         [0067]    A series of twelve generally circular holes  72  extend through the first part spherical surface  58 . In use the apertures may receive one of two diametrically opposed pegs which depend from the slope adjuster plate described in more detail below. Although the circular holes are superficially similar in appearance, in fact the axes of the circular holes are slightly different and apart from a 0% compensation pair of opposed circular holes are offset relative to the vertical axis of the pedestal, to compensate for the different orientations of the slope adjuster plate on the head member. There are two pegs and the apertures are located so that diametrically opposed pairs are aligned at the same angle. Also the centre of the circular holes are not arranged equidistantly from the centre of the head member but are arranged on two part spiral curves each extending through 180°, to account for the differences in position of the slope adjuster plate on the head member. The holes corresponding to a particular percentage compensation is further from the centre of the aperture  56 , than the holes corresponding to a lesser degree of slope compensation. 
         [0068]    The slope adjuster plate is best shown in  FIGS. 3 and 4 . It is generally circular in plan view. The top surface  102  includes a central circular portion  104  which is recessed relative to an outer ring  106 . A circular aperture  108  is defined in the centre of the adjustment plate. As is best seen in  FIG. 4 , a larger diameter circular skirt portion  110  depends down from the convex underside of the slope adjustment plate encompassing the aperture. As is best seen in  FIG. 9 , the centre of the skirt portion is offset from the centre of the aperture in the plate. A tab  112  projects radially outwardly from the base of the circular skirt. 
         [0069]    In order to fix the slope compensation plate relative to the head  50  and prevent accidental dislodgement of the same due to wind, an impact or the like, screw holes  113  are provided in the top of the plate through which “tek” screws or the like may pass into receiving/pilot holes  115  in the head  50  (see  FIG. 5 ). Alternatively the screws may simply be screwed into the head portion  52 . 
         [0070]    The top surface of the adjustment plate is marked with a cross  114  passing through the centre of the plate and defined by intersecting relatively shallow grooves. At each end of the cross a short arm  116  is defined which protrudes beyond the circumference of the top surface of the adjustment plate and defines a hole  118  for tying wire, string or the like to the pedestal. The arms can also be used to lift the adjustment plate for adjusting the degree of slope compensation. 
         [0071]    One arm of the cross is marked with an arrow  120  and “UP SLOPE”. In use, the arrow/arm should point in the upward direction of the slope of the sub floor. 
         [0072]    A series of six spaced apertures  122  are defined in the top surface of the slope adjustment plate. The apertures are triangular, and are shaped to receive the triangular post  70  which projects up from the head member  50  and slots into one of the six apertures depending on the relative orientation of the plate  100  and head member  50 . In the described embodiment the degree of slope compensation is from 0% to 5%, in one percent increments and the apertures are numbered 0 to 5 to indicate the selected degree of slope compensation. The post  70  is most preferably in a contrasting colour to the colour of the slope compensation plate. 
         [0073]    The underside of the slope compensation plate defines a convex part spherical surface  130  extending in a band outside the skirt  110 . The surface is not continuous but is defined by the lower edges of an array of intersecting circular rings and radial ribs. This allows for drainage and for simpler manufacture. A flange  140  extends from the outer edge of the convex surface to a further part spherical convex surface  142  defined at the outer edge of the underside of the plate  100 . The centre of curvature of the further convex surface is the same at that of the convex surface, although its radius of curvature in greater. 
         [0074]    Two diametrically opposed cylindrical pegs  132  and  134  depend down from the convex surface spaced, one peg  134  being relatively wider than the other  132 . 
         [0075]      FIGS. 6 to 11  show the assembled head assembly and illustrate its use. With reference to  FIGS. 10 and 11  in particular, the depending skirt  110  of the slope compensator plate  100 , passes through the aperture  56  in the centre of the head member. The tab  112  and the semicircular skirt ensure that the device can only be assembled in the correct orientation allowing for 180° rotation of the slope compensator relative to the head member, as the tab  112  moves in a semicircular path between the ends of the skirt  68 . When the tab reaches the skirt, further rotation is prevented by the tab  112  abutting the skirt  110 . This is best seen in  FIG. 9 . 
         [0076]    In the described embodiment the head assembly may be positioned in six different orientations corresponding to the degree of slope compensation from 0% ( FIG. 7 ) to 5% ( FIG. 8 ), in one percent increments. The degree of slope compensation is determined by which pair of opposed holes  70  the depending pegs  132  and  134  are inserted in. As discussed above, the angle of the central axis of each pair of opposed holes relative to the vertical axis of the pedestal is slightly divergent from the axis to provide the required degree of slope compensation. One peg being wider than the other also helps prevent mis-assembly. The triangular apertures  122  indicate which degree of slope compensation is being provided as the protrusion  70  appears in the relevant aperture.  FIG. 7  illustrates 0% slope compensation.  FIG. 8  illustrates 5% slope compensation. To adjust the degree of slope compensation an operator inserts their finger or thumb in the aperture  108  in the plate, or lifts the short arms  116 , with the tab preventing accidental removal, and simply rotates the plate until the protrusion is located below the relevant aperture  122  indicating the desired degree of slope compensation, and lowers the plate at which time the pegs  132 ,  134  should slot into the correct pair of holes  70 . Advantageously, whatever degree of slope compensation is provided, the UP SLOPE arrow  120  is always pointed in the counter direction of the slope. 
         [0077]    Numerous variations to the described embodiment are possible. For example although 0 to 5% slope compensation is provided in the described example, it will be appreciated that it would be possible to create say 0 to 6% compensation, in which case  14  holes will be provided in the central concave area of the head member, or greater degrees of compensation such as 0 to 10% or more. 
         [0078]    Although the pedestal as described above is particularly suited to use on sloping sub floors and subsurfaces to create a level pedestal floor, it will be appreciated that it may also be used to create a level raised floor on a level/horizontal sub floor, in which case the slope adjustment plate is set to 0% slope compensation. Alternatively it could also be used to create a sloping pedestal floor on top of a horizontal sub floor/subsurface. 
         [0079]      FIG. 12  shows a section through the adjustable pedestal. With reference to that figure, it can be seen that if the slope compensator plate  100  and optionally also the head portion  50  are removed the pedestal is substantially hollow with a substantially free path for material to pass into the pedestal from its open top to the base  14 . This is made possible in part by the fact that the interior of the spacer portion is open and at its narrowest in still about 80 mm diameter. This allows the filling of the pedestal with ballast such as gravel, hard core rocks or other suitable materials. This is particularly advantageous where there is a need to increase the weight of the pedestals, for example where they are or may be immersed in water. It also allows for the possibility of filling the pedestal with concrete to increase the strength weight and durability of the pedestal.  FIG. 12   a  shows the pedestal containing ballast in the form of rocks  200 . A concrete  210  filled pedestal  10  is shown in  FIG. 12   b.    
         [0080]      FIG. 13  shows a variant  250  of the cruciform paver separator  150 . The only difference present in the variant  250  compared to paver separator  150  is in the form of the spigot  252  which depends from the paver separator  250 . Instead of the four depending legs of paver separator  150 , the depending spigot  252  of separator  250  is annular having a circular cross-section in a plane parallel to the plate  254  of the separator. 
         [0081]      FIG. 14  shows a slope compensator plate  300  which is a variant of the slope compensator plate  100  shown in  FIGS. 3 and 4 . The slope compensator plate  300  is identical to the compensator plate  100 , except that instead of having a through hole for receiving the depending legs of the separator, it defines an annular channel  302  having a circular cross-section for receiving the depending spigot  252  of the paver separator. The channel has a base  304  so that it is closed and any water that may pass into the channel  302  cannot pass into the pedestal below. The channel  302  is substantially the same size, shape and depth as the depending spigot  252  so that the spigot is a tight fit within the channel. 
         [0082]    It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.