Regulation 3.2 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Invention Title: Table assembly The following statement is a full description of this invention, including the best method of performing it known to us: 1000616604.1 2 Table assembly Field of the invention The present invention relates to table assemblies, particularly those that can be easily assembled for use and disassembled for storage. The table assemblies find particular application in a function or hospitality environment. Background of the invention There are many situations, particularly in the function or hospitality environment, where a large number of tables are required to be temporarily set up for use and then packed away for storage. There is a requirement to be able to do this as quickly as possible with a minimum number of staff. The traditional tables used in these situations are known as trestle tables. Trestle tables have a flat table top with depending legs that are permanently attached to the bottom surface of the table top. The legs are pivotable and when folded lie flat against the bottom surface so that the trestle tables can be stacked together when not in use. One of the main problems with trestle tables is that they can accidentally fold when knocked from one end. However, providing complicated means for locking the legs contributes substantially to set up and disassembly time. Another problem with trestle tables is that their appearance is quite unattractive in formal or professional settings. It is therefore standard practice to drape the tables with table cloths. This of course adds to the time required to set up a room full of tables and to clear the room. Additional cost is incurred for laundering the table cloths. It is therefore an object of the present invention to provide an improved table assembly that alleviates some of the problems with current tables for this purpose and achieves a balance between efficiency of set up and disassembly time, stability and 5 appearance. Reference to any prior art in the specification is not, and should not be taken as, an acknowledgment, or any form of suggestion, that this prior art forms part of the common general knowledge in Australia or any other jurisdiction or that this prior art 1000616604.1 3 could reasonably be expected to be ascertained, understood and regarded as relevant by a person skilled in the art. Summary of the invention According to an aspect of the invention, there is provided a table assembly, including: a removable table top having respective generally flat main surfaces; and at least one supporting structure for the table top, the supporting structure including at least two frames each having two upright legs connected by at least one substantially horizontal member; wherein the frames are mutually articulated about a vertical axis by coupling the horizontal members at a position intermediate their respective ends, such that the frames pivot about the vertical axis with respect to each other between an expanded position for supporting the table top and a collapsed position for storage, wherein the table top includes four circular recesses housed in four circular fixtures respectively, the four circular fixtures arranged to form a rectangle, and wherein the circular recesses and circular fixtures are recessed into a main surface of the table top, such that the circular fixtures are flush with the main surface of the table top; and wherein the circular recesses are engaged by the upright legs to stabilise the supporting structure in the expanded position. ) Preferably the supporting structure does not extend laterally past the perimeter of the main surfaces of the table top. According to a second disclosure of the invention, there is provided a table assembly, including: a removable table top having respective generally flat main surfaces; and 5 a supporting structure for the table top, the supporting structure including at least two frames each having two upright legs connected by at least one substantially horizontal member, whereby the table top rests on the upright legs; 1000616604.1 4 wherein the frames are mutually articulated about a vertical axis by coupling the horizontal members at a position intermediate their respective ends, such that the frames pivot about the vertical axis with respect to each other between an expanded position for supporting the table top and a collapsed position for storage. According to a third disclosure of the invention, there is provided a table assembly, including: a removable table top having respective generally flat main surfaces; and at least two supporting structures for the table top, each supporting structure including: at least two frames each having two upright legs connected by at least one substantially horizontal member, whereby the table top rests on the upright legs, the frames being mutually articulated about a vertical axis by coupling the horizontal members at a position intermediate their respective ends, such that the frames pivot about the vertical axis with respect to each other between an expanded position for supporting the table top and a collapsed position for storage. In the above second or third disclosures, preferably the supporting structure does not extend laterally past the perimeter of the main surfaces of the table top. Either main surface of the table top can be the upper surface and preferably the main surfaces have different finishes such that the appearance of the table can be changed by flipping the table top. According to a fourth disclosure of the invention, there is provided a table assembly, including: a removable table top having respective generally flat main surfaces; and 1000616604.1 5 at least one supporting structure for the table top, the supporting structure including at least two frames each having two upright legs connected by at least one substantially horizontal member; wherein the frames are articulated about a vertical axis by coupling the horizontal members at a position intermediate their respective ends, such that the frames pivot about the vertical axis with respect to each other between an expanded position for supporting the table top and a collapsed position for storage, and wherein each upright leg includes a seat on which the table top rests thereby stabilising the supporting structure in the expanded position. In the fourth disclosure, preferably the supporting structure does not extend laterally past the perimeter of the main surfaces. Advantageously, the edges of table top engage the seat. The upper end of the upright legs preferably has a corner removed to provide the seat. It is preferably that the table top is square and the supporting structure has two frames, such that one upright leg engages each edge of the table top. In each of the aforesaid aspect or disclosures of the invention, the table top is advantageously rectangular, although it will be appreciated that it may be any shape, such as circular. The upright legs and horizontal members may have a circular cross section or a rectangular cross-section. Alternatively, the upright legs have a tubular cross-section and the horizontal members have a rectangular cross-section. ) In each of the aforesaid aspect or disclosures of the invention, it is preferable that the frames include at least one horizontal member adjacent the top of the upright legs. However, the frames may include two horizontal members adjacent respective ends of the upright legs. In this embodiment, the supporting structures can be positioned with either of the respective ends of the upright legs engaged with the ground. A vertical pin 5 may be used to couple the horizontal member of one frame to the horizontal member of another frame. When two horizontal members are provided, respective vertical pins can couple the upper and lower horizontal members of one frame to those of another frame. A vertical member may extend between the upper and lower pins to provide stability to the 6 supporting structure. A projection may be provided on one horizontal member to limit the angular expansion of the supporting structure. Brief description of the drawings The invention will now be described, by way of example only, with reference to 5 the accompanying drawings, in which: Figure 1 is a perspective view of a table assembly according to a first aspect of the invention; Figure 2 is a perspective view of a table assembly according to a second aspect of the invention; 10 Figure 3 is a perspective view of a table assembly according to a third aspect of the invention; Figure 4 is a perspective view of the table assembly of Figure 3 with the supporting structure in the collapsed position; Figure 5 is a fragmentary cross-sectional view of the table assembly of Figures 3 15 and 4; Figure 6 is a perspective view of a table assembly according to a fourth aspect of the invention; Figure 7 is a fragmentary cross-sectional view of a table assembly of Figure 6; and 20 Figure 8 is a partial perspective view of the table assembly of Figure 6.
7 Detailed description of the embodiments A number of different embodiments of the invention can be found in Figures 1 to 8. Like numerals have been used where similar features are present in the drawings. A table assembly 10 is provided that includes a removable table top 12 having 5 respective generally flat main surfaces 14, 16. In the embodiments shown in Figures 1, 2, 6, 7 and 8, the main surfaces 14, 16 may have different finishes such that the appearance of the table assembly 10 can be changed by flipping the table top 12. In another form, table top 12 may be glass or otherwise transparent. A supporting structure 18 is used to support the table top 12 when in the assembled position, as best 10 shown in Figures 1, 2 and 6. As shown in Figure 2, two supporting structures 18 may be used to support a single table top 12 of greater length. The supporting structure 18 includes at least two frames 20a, 20b, each frame 20 has two upright legs 22 connected by horizontal members 24, 26 adjacent the respective ends 28, 30 of the upright legs 22. It can be seen from the Figures, that ends 15 28 engage the ground and the table top 12 rests on the ends 30 of upright legs 22. However, it will be appreciated that the supporting structures 18 shown are symmetrical about a horizontal central plane and therefore may be orientated with either ends 28 or ends 30 engaged with the ground. This allow the set up of the table assemblies to be accomplished quickly, as ensuring correct orientation of the support structures 18 is not 20 required. The frames 20a, 20b are mutually articulated about a vertical axis 32, best shown in Figure 4. The two frames 20a, 20b are coupled, at a position intermediate the respective ends 34, 36 of the horizontal members 24, 26, by vertical pins 38. As can be seen in Figures 3 and 4, the frames 20a, 20b pivot about the vertical axis 32 with 25 respect to each other between an expanded position (Figure 3) for supporting the table top 12 and a collapsed position (Figure 4) for storage. The table tops 12 are removable, such that they can be stacked separately to the supporting structures 18. The table assemblies 10 can be stored on trolleys, with the 8 supporting structures 18 hanging on racks, with the horizontal members 26 hooking over arms on the trolley so as to be suspended. In the embodiments shown in Figures 1 to 5, the supporting structure 18 does not extend past the perimeter 40 of the main surfaces 14, 16 and is therefore neatly hidden 5 beneath the table top 12. As can be seen from the different embodiments shown in the drawings, the supporting structures may have relatively short horizontal members 24, 26 as shown in Figures 1 and 2 creating a substantially square arrangement of the upright legs 22. In this case, two supporting structures 18 are used to support a long table top 12. 10 Alternatively, the horizontal members 24, 26 may be long, as shown in Figure 3, such that one supporting structure 18 is used to support a long table top 12. For ease of manufacture and aesthetic reasons, the upright legs 22 typically have a circular cross section and may be made from tubular steel. The horizontal members 24, 26 typically have a rectangular cross-section and may be box section steel. 15 To set up the table assembly 10 shown in Figure 1, the supporting structure 12 is stored in the collapsed position and is lifted off the trolley and set on the ground with ends 28 of the upright legs 22 on the ground. One of the frames 20a is then pivoted with respect to the other frame 20b, until a projection 42 on horizontal member 26a abuts against horizontal member 26b to limit the angular expansion of the supporting structure 20 18. The table top 12 is then lifted and sat on top of the ends 30 of the upright legs 22. In the embodiment shown in Figure 3 to 5, the table top 12 includes four recesses 44 contained within fixtures 46. The fixtures are preferably stainless steel and are inserted into pre-drilled hollows 48 in main surface 16 so as to be flush. The ends 30 of the upright legs 22 positively engage in the recesses 44 to stabilise the supporting 25 structure 18 in the expanded position. The table cannot be accidentally knocked over, as the table top 12 must be lifted to disengage the ends 30 of the upright legs 22. In the embodiment shown in Figures 6 to 8, each upright leg 22 includes a seat 50 in end 30. The upright legs 22 have a rectangular cross-section and a corner is cut 9 away to create a horizontal surface 52 and a vertical surface 54. The table top 12 rests on the seat 50, with the main surface 14 engaged with horizontal surface 52 and the perimeter, or edge, 40 of the table top 12 engaging with the vertical surface 54, thereby stabilising the supporting structure 18 in the expanded position. Similar to above, the 5 table cannot be knocked over accidentally, as the table top 12 must be lifted to disengage the ends 30 of the upright legs 22. The advantage of the embodiment shown in Figures 6 to 8 is that the supporting structure 18 can be expanded by pivoting the frames 20a, 20b to where the horizontal members 24, 26 lie perpendicular to one another. The table top 12 can then simply be 10 dropped into place on the seats 50. The table top 12 can have different finishes on the main surfaces 14, 16 to create two different aesthetically appealing looks. The different finishes may be two different colours, so that all tables in a room are the same colour or may alternate. A table assembly 10 made according to any of the aspects of the present 15 invention is easily and quickly assembled by a single person. The simplicity of the appearance makes it suitable for any function, without the table top being draped. In some forms of the invention positive engagement between the supporting structure and table top prevents accidental collapsing of the table assembly, whilst providing easy and simple engagement and disengagement for setting up and storage. 20 It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text or drawings. All of these different combinations constitute various alternative aspects of the invention.