Abstract:
A sturdy lightweight table support system offers advantages of self-squaring, sturdy design, a low unassembled volume combined with simple parts that enable easy assembly, a system that enables user specification of table size that will result in easily prepared components thus all but eliminating stocks of different sized components, and sturdy lockable height adjustments. The self-squaring is achieved with a corner bracket system that uses a corner bracket that is inset with respect to a cross member within which it is mounted so that bolted assembly will result in a large, even pressure about the butt end of the cross member against the post that is extremely resistive to angular displacement of the cross member with respect to the post in any direction.

Description:
FIELD OF THE INVENTION 
     The present invention relates to improvements in the field of inexpensive table support structures having high strength and high precision construction, a design approach amenable for just-in-time manufacturing that can be used for a wide variety of applications requiring stability and durability. 
     BACKGROUND OF THE INVENTION 
     Sturdy table base supports that have high load bearing capacity and deformation resistance are usually custom made, expensive, heavy, and dedicated to one fixed mode of use, configuration or size. Examples of sturdy, stable, and exacting table supports include optical benches, fixed height work benches, and table bases architecturally custom built into a building. Work benches require sufficient strength to support both the weight of work materials, tools and support structures as well as the working forces produced when the materials are processed while being supported. As a conventional example, a sturdy table base may have a height of 0.8 meters and a horizontal area of 1.0 meter by 3.0 meters and weigh 160 kilograms. These types of tables are usually welded and may require a set of holding fixtures during assembly to insure that they are consistently properly aligned. Production setups are generally fixed so that different sized tables will require a specific combination of sets of pre-specified parts and holding fixtures for each size of table to be produced. A required inventory of pre-specified parts for each one of a number of table sizes commercially offered can require a manufacturer to stock a sizeable inventory representing a sunk investment cost that will necessarily increase the cost to consumers. 
     Each different size or other aspect of configuration offered can easily multiply the numbers of sets of components and thus multiply total inventory cost. Conversely, an inability to make or offer different sizes of table supports and tables will reduce the market penetration for a type of table construction because it does not meet enough of a market segment customers&#39; needs. In this case users would likely, even though reluctantly, select other types of tables in order to meet their space and size requirements. What is therefore needed is a table support system which can give table purchasers the flexibility to specify a large number of table size attributes in order that table manufacturers be able to make hundreds of different sizes of tables without having to incur the sunk cost of stocks of different sized components for each combination that might be specified by a customer and thus enable a wide variety of table supports to be made available at a lower price. 
     SUMMARY OF THE INVENTION 
     A sturdy lightweight table support system offers advantages of (1) self-squaring, sturdy reliable design, (2) a low unassembled volume for reduced cost shipping, (3) simple parts that enable reliable, user friendly assembly, (4) a simplified assembly system that enables standardization of some components and enables dimensional variance of other components, especially extruded components, by simple length cutting to produce different table sizes without the need to stock different lengths of such extruded components. 
     A self-squaring attribute is achieved by focussing dimensional precision on the more easily controllable square cut ends of the lengths of horizontal members. The ability to isolate a major aspect of precision on the horizontal members with respect to the corner posts is achieved with a corner bracket system. The corner bracket system uses a corner bracket that is supported within and near the ends of the horizontal members. The individual corner brackets are inset with respect to the high precision square cut ends of the horizontal member. The fixed attachment of the bracket in a slightly inset position with respect to the square cut ends of the horizontal members enables bolting of the brackets to the corner posts with forces created in the direction of a square post so that the bolted assembly will result in a large, evenly distributed bearing pressure force about the butt end of the horizontal member. The precision square cut ends of the horizontal members are placed under high bearing pressure against their respective horizontal posts to orient the horizontal members at an exact, strong right angle relationship. The result is a structure with very strong resistance to angular deflection of the table support using this square cut system. The corner bracket undergoes forced displacement toward the post and creates a high force pulling tension of the horizontal member in the direction of the square post. 
     The stability of each end of each horizontal member with respect to the post to which it is attached is synergized and mutually enforced when four horizontal members are connected between four posts to form a closed rectangular cell structure. Any force applied to one of the four posts and against or away from a diagonally opposite post would require the other two diagonally oriented posts to experience an angular opening or closing force, in addition to the angular closing or opening forces of the two diagonally oriented posts being acted upon. As a result, an attempted deformation of a rectangular cell made up of four posts and four cross members that each have two ends strongly attached to the posts (such as those that may lie in a horizontal plane) would have the combined strength of eight horizontal-member-to-post connections opposing it. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention, its configuration, construction, and operation will be best further described in the following detailed description, taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a perspective view looking downward onto an assembled table that illustrates a sturdy lightweight table base having four casters for ease of movement, the table base supporting a plain planar top is but one example of any number of tops that can be stably supported by the table base; 
         FIG. 2 , an exploded view of the table seen in  FIG. 1  illustrates an overview of nearly all of the components that make up the table and the sturdy lightweight table base sufficient to lay an orientational foundation for further discussion; 
         FIG. 3  is an expanded lateral outside view of one corner of the sturdy lightweight table base seen in  FIGS. 1 &amp; 2  and has sufficient expanded scale for further illustration; 
         FIG. 4  is a plan view looking into the end of the horizontally oriented cross member taken along line  4 - 4  of  FIG. 3  and illustrating an overall “C” shape and including structures that effectively form, with the vertical common wall, two pair of oppositely oriented slots; 
         FIG. 5  is a plan view looking into the end of a vertically oriented post member taken along line  5 - 5  of  FIG. 3  and illustrating a vertical post seen in  FIGS. 1-3  having an overall square shape with four outer walls with curved corner transitions, each having a series of inwardly projecting supports engaging an inner tube, the inner tube having inwardly disposed ribs; 
         FIG. 6  is a perspective view of a load flank nut and illustrating internal threads within an internal bore, an outer upper diameter carrying grooves and overlying a lower diameter slightly larger than an upper diameter to limit the extent of travel into the post shown in  FIG. 5 ; 
         FIG. 7  is an upper perspective view of a stabilization guide plate having a series of four oppositely disposed guide slots each separated by an indentation, with the stabilization guide plate having a central surrounding through-opening to facilitate attachment; 
         FIG. 8  is an upper perspective view of a vertically oriented post as was seen in  FIGS. 1-3  and shown in an abbreviated fashion to emphasize the location and orientation of threaded bores used to attach brackets of horizontal cross members as well as the location of a threaded caster lock bore; 
         FIG. 9  is a side plan view taken along line  9 - 9  of  FIG. 4  and looking into the inside of a cross member such that a third planar member is seen beyond the outer slot end walls and illustrating a vertical alignment for square punched holes generally possible with larger vertical clearances of larger cross members; 
         FIG. 10  is a side plan view similar to that seen in  FIG. 9  and looking into the inside of a smaller, especially as to its vertical dimension, cross member than was seen in  FIG. 9  and illustrating a horizontal alignment, that may be vertically centered, for square punched holes in order to provide access clearance; 
         FIG. 11 , is a perspective a view of the corner bracket seen in  FIGS. 2 &amp; 3  which has first and second planar members carrying securing apertures for attachment to the cross member of  FIG. 9 ; 
         FIG. 12 , is a view taken along line  12 - 12  of  FIG. 11 , which is a plan view of the corner bracket looking into second planar member which will oppose, and be slightly spaced apart from, but urged toward the surface of the vertical post of  FIG. 8  when it is attached within and guided by structures of the cross member of  FIGS. 1-4 &amp; 9 ; 
         FIG. 13 , is a view taken along line  13 - 13  of  FIG. 12 , which is a plan view looking down on the top of the corner bracket and illustrating the right angled relationship of preferably integrally formed first, second and third planar members; 
         FIG. 14  is an expanded upper perspective view of a horizontally oriented cross member and bracket as was seen in  FIGS. 2, 3, 4, 9 , &amp;  11 - 13  and shown in a position which facilitates an explanation of a portion of the process of assembly; 
         FIG. 15  is an expanded upper perspective view of the horizontally oriented cross member and bracket as was seen in  FIGS. 2, 3, 4, 9 , &amp;  11 - 14  and similar to the orientation of  FIG. 14  except that the component parts seen in  FIG. 15  are assembled and without the presence of the vertical post of  FIG. 8  which is not shown in order to avoid obscuring details; 
         FIG. 16  is an end view of the assembled horizontally oriented cross member and corner bracket taken along line  16 - 16  of  FIG. 15  and seen generally as combining the view of the horizontally oriented cross member of  FIG. 4  with the view of the corner bracket similar to the view of  FIG. 12 ; 
         FIG. 17  is a side view looking into the inner side of a cross member just after the corner bracket is already attached with carriage bolts to the horizontal cross member and at the point in time when the horizontal cross member is brought into position with respect to the post so that the a butt end of the cross member contacts flat against a flat side of the post in anticipation of threaded flange head screws through the securing apertures for threaded engagement into threaded bores carried within the post; 
         FIG. 18  is a view similar to that seen in  FIG. 17  that illustrates a narrowing of the gap as the flange head screws urge the second planar member of the corner bracket and the horizontal member to which it is attached forward toward the flat side of the post; 
         FIG. 19  is a plan view looking down along line  19 - 19  of  FIG. 18  and illustrating the shape of the second planar member of the bracket after deformation due to tightening of the threaded flange head screws through the securing apertures of the second planar member of the bracket and into tightened threaded engagement into threaded bores carried within the post; 
         FIG. 20  is a perspective view into an inside corner of a post having two horizontal cross members attached to a vertical post at the same level; 
         FIG. 21  is an expanded perspective view of the exploded components of the wheel assembly shown in  FIG. 3 ; 
         FIG. 22  is a further expanded plan view of the partially assembled jacking thread member with the stabilization guide plate in place; 
         FIG. 23  is a view looking down upon the rectangular structure of the table support in an assembled condition similar to that shown in  FIG. 1 , but with the plain planar top not shown and with the wheel assemblies not shown in order to provide an unfettered expanded plan view of the resulting cell formed from the upper horizontal cross members which may or may not be identical in cross sectional dimension but the same length as any set of horizontal cross members lying below; 
         FIG. 24  is a side plan view looking into a rectangular structure of the upper and lower cross members and two attached square posts to form a closed vertical rectangular structure of the cell table support seen in an assembled condition similar to that shown in  FIG. 1 , but with the plain planar top not shown in order to provide an unfettered expanded plan view with cross members and square posts which may or may not be identical in cross sectional dimension but the same length as any set of horizontal cross members lying beyond; 
         FIG. 25  is a perspective view of one possible realization of an attachment bracket for securing the table top seen in  FIG. 1 , to an upper horizontal cross member; 
         FIG. 26  is a side view of the attachment bracket of  FIG. 25 , taken along line  26 - 26  of  FIG. 25 ; 
         FIG. 27  is top plan view of the attachment bracket of  FIGS. 25 and 26 , taken along line  27 - 27  of  FIG. 26 ; 
         FIG. 28  is an exploded view of an underside perspective arrangement illustrating a corner post with exploded views of an overhead tabletop, attachment brackets and threaded members in a position to attach the table top using the bracket of  FIGS. 25-27 ; 
         FIG. 29  is an underside perspective view similar to that seen in  FIG. 28 , but illustrating the final attachment bracket of  FIGS. 25-27  joining an upper horizontal cross member to a plain planar table top; 
         FIG. 30  is a perspective view of one example of commercially available extrusions shown in a vertical position and having four sides and four vertical slots, each at a center of the four vertical sides, as an example of how the principles used in the sturdy lightweight table base and method of the invention can be employed with many other structural components; 
         FIG. 31  is downward view looking into the commercially available extrusion taken along lines  31 - 31  shown in  FIG. 30  and showing the approach of the horizontally oriented cross member and bracket similar to that seen in  FIG. 13  but shown with the upper first wall removed to better illustrate the bracket with flange head screws engaging a adapter block; 
         FIG. 32  is an end view illustrating one of the threads in broken line format extending through the adapter block; 
         FIG. 33  is a perspective view illustrating the two, spaced apart threaded bores and the angled surfaces of the adapter block; 
         FIG. 34  is a top view looking down into the commercially available extrusion of  FIGS. 30 and 31  with one of the slots occupied by an adapter block of  FIGS. 31-33 ; 
         FIG. 35  is a side view looking into the open side of a cross member with the adapter block held loosely by the flange head bolts and in a position for the adapter block to be raised and lowered into a slot carried by the extrusion; and 
         FIG. 36  is a view similar to the view of  FIG. 35  after the cross member is brought level with the top of the extrusion and after the flange head bolts are finger tightened, but before further tightening causes deformation of the corner bracket. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIG. 1 , a perspective view looking downward onto a table  101  illustrates a sturdy lightweight table base  103  supporting an upper structure which is shown as a plain planar top  105 . Table base  103  has a rectangular cubic shape, but can be formed in any shape as well as multiples of the rectangular cubic shape shown. Top  105  can be of any shape and adapted to either be supported by or fixably attached to the base  103 . Some of the elements of the table base  103  that are most prominent and at least some of which may be seen in  FIG. 1  include a series of four wheeled casters  107  and four preferably identical vertically oriented predominantly square posts  111 . A pair of longer upper cross members  121 , a pair of longer lower cross members  125 , a pair of shorter upper cross members  131 , and a pair of shorter lower cross members  135  (to the extent that they can be seen in  FIG. 1 ) are each shown as having their two ends attached between two associated ones of the four preferably identical vertically oriented predominantly square posts  111 . For aesthetic and safety purposes the edges of the predominantly square posts  111  are rounded, but an important attribute of the square posts  111  is that they have four face surfaces, each at ninety degrees from an adjacent face surface to enable a square orientation of the cross members  121 ,  125 ,  131 , &amp;  135  which bear against those face surfaces. 
     Referring to  FIG. 2 , an exploded view of the table seen in  FIG. 1  which illustrates an overview of the bulk of the components that make up the table  101  and the sturdy lightweight table base  103  sufficient to lay an orientational foundation for further discussion. Additional smaller components in  FIG. 2  are associated with the cross members  121 ,  125 ,  131 , &amp;  135  and are identified as a cross member assembly  141  the additional components associated with the casters  107 , are seen as a caster assembly  145 . The collection of all the component parts seen in  FIG. 2  assists in orientation for explanations that follow, but may have a scale too small for complete identity in  FIG. 2  such as brackets and fasteners that will be shown in detail. 
     Referring to  FIG. 3 , a closeup view of one corner of the sturdy lightweight table base  103 , similar to that seen in  FIG. 2 , has sufficient scale for further illustration. The cross member assembly  141  for illustration is seen to contain one of the shorter lower cross members  135  as a central element. To one side of the cross member assembly  141  is seen a corner bracket  151 , and a pair of carriage bolts  155 . Carriage bolts  155  have a square-necked underside that prevents rotation in a square punched aperture. Corner bracket  151  is attached to respective associated cross members  121 ,  125 ,  131 , &amp;  135  at one side of corner bracket  151  for ease of access, but this need not be the case. A different shaped corner bracket  151  could be employed to engage the cross members  121 ,  125 ,  131 , &amp;  135  at different sides and locations. 
     Shown somewhat opposite each pair of carriage bolts  155  is a pair of serrated flange head nuts  157  which are engageable with the carriage bolts  155 . Shown aligned and directed toward the square post  111  is a pair of serrated locking flange head screws  161 . In  FIG. 3 , the outer facing surfaces of the pair of longer upper and lower cross members  121  &amp;  125  can be seen as having a pair of square punched holes  165  as the pair of shorter upper and lower cross members  131  &amp;  135  cannot be seen as well as they are facing away from the view of  FIG. 3 . Cross members  121 ,  125 ,  131 , &amp;  135  all have butt ends  169  which are used to bear against the square post  111  to form a sturdy, secure right angled support. Note that the shape of the corner bracket  151  follows the shape of the cross members  121 ,  125 ,  131 , &amp;  135 . Cross members  121 ,  125 ,  131 , &amp;  135  can have a shape other than sharply square. Many variations are possible. 
     Each of the corner brackets  151  has an overall “J” shape when viewed from a vertical vantage point and preferably a constant overall height. A first planar member  171  is used for inserting the corner bracket  151  into the cross members  121 ,  125 ,  131 , &amp;  135 . A second planar member  173  may generally be at a right angle to the first planar member  171  and lies opposite the square post  111 . A third planar member  175  is shown as having an abbreviated length, but it need not be so abbreviated. Third planar member  175  can also have a complex shape that provides greater length at its top and bottom combined with removed portions which still enable access to the carriage bolts  155 . Third planar member  175  extends from the second planar member  173 , may generally be at a right angle to the second planar member  173 , and may extend away from the second planar member  173  parallel to and in the same direction as the first planar member  171  extends from the second planar member  173 . 
     Securing apertures  177  are seen in first planar member  171  and securing apertures  179  are seen in second planar member  173 . As will be shown, the corner bracket  151  will be fixed to the cross members  121 ,  125 ,  131 , &amp;  135  and then bolted to threaded apertures within the square post  111  to cause the butt end  169  to be forced against a flat side  181  of the square post  111 . The term flat side means that a square cut end will fit flat across it and be supported so that any of the cross members  121 ,  125 ,  131 , &amp;  135  will be constrained to be angularly deflected in any direction. 
     A threaded caster lock bore  183  is seen at a position at the middle of the flat surfaces  181  about the periphery of a lower end of square post  111 . Square post  111  has an upper and lower opening  185  of which only upper opening  185  is seen in  FIG. 3 . As will be shown, several threaded caster lock bores  183  may be provided in a configuration so that two threaded caster lock bores  183  on two flat surfaces  181  can be used to separately to retain the caster assembly  145  and to lock the height of the caster assembly. Threaded caster lock bores  183  may appear on all four sides  181  and may be spaced farther from or closer to threaded cross member attachment bores  187  as desired. 
     The square post  111  is preferably an extrusion and is shown as having an opening  185  seen at the top of  FIG. 3  and which extends through the square post  111 . A set of upper and lower series of threaded cross member attachment bores  187 , seen externally in vertical pairs, are provided to engage and hold the corner brackets  151 . In most cases where the cross members  121 ,  125 ,  131 , &amp;  135  are of the same cross sectional size width and where their mounting is to occur at opposite ends of the square post  111 , or evenly spaced along the posts  111 , the posts  111  may be identical. Note that in describing sturdy lightweight table base  103 , only a single rectangular basic unit of support will be illustrated, for simplicity. 
     Multiples of this single rectangular cubic basic unit can be formed in a direction perpendicular to any side of the single rectangular basic unit by providing more square posts  111  and the upper and lower cross members  121 ,  125 ,  131 , &amp;  135  for connection to the added square posts  111 . In addition, even though only upper cross members  121  and  131  are shown as uppermost cross members and although lower cross members  125  and  135  are shown as lowermost cross members, other sets of cross members (not shown) can occur between any uppermost and lowermost cross members to provide further intermediate cross members for additional strength, where needed. The drawings show only upper and lower cross members  121 ,  125 ,  131 , &amp;  135  for ease of illustration. 
     Also seen in  FIG. 3 , below the bottom of the square posts  111  is an exploded view of caster assembly  145 . As will be seen in further expanded detail in a subsequent drawing, the opening  185  is a bore having a series of vertical ribs (not yet shown) that engage a vertical translation and stabilization guide plate  189  which can move vertically within the opening  185  of the square post  111  in order to help stabilize and keep centered the upper end of a jacking thread member  191  that will reside within its square post  111 . The vertical translation and stabilization guide plate  189  has an aperture (not clearly seen in  FIG. 3 ) and attaches over the top of the jacking thread member  191 , and is secured with a threaded member  193  and washer  195 . 
     The jacking thread member  191  is seen in  FIG. 3  to have a small upper threaded bore  197  partially within an small boss  199 . Below the small boss  199  a main load flanked thread  201  is seen throughout the largest diameter of the jacking thread member  191 , which may be an ACME thread. At the bottom of the jacking thread member  191 , a smaller diameter thread set  203  underlies the lower terminus of the extent of the main load flanked thread  201 , and occupies a medium diameter boss structure  199  that includes an internal threaded bore (not seen in  FIG. 3 ). Below and separated from the smaller diameter thread set  203 , is seen, a load flank nut  205  sized to engage the main load flanked thread  201  of the jacking thread member  191  to enable the jacking thread member  191  to turn and adjust its height with respect to the load flank nut  205  that will be captured and secured just inside of the bottom of the square post  111 . At the base of the jacking threaded member, within and opening below smaller diameter thread set  203 , and directly above the load flank nut  205 , a threaded caster bore  207  is indicated with an arrow. 
     The load flank nut  205  has a vertical upward limit stop flange  211  which limits its insertion into opening  185  of the square post  111 . Load flank nut  205  may have one or a number of lock apertures  217  and screw indents  218  for use in conjunction with one or more locking screws  219  (one is shown) that can be threaded into and through threaded caster lock bore  183  of the square post  111  to permit either passage through the load flank nut  205  via lock aperture  217  to lockably bear against and engage the main load flanked thread  201  to prevent its inadvertent turning, or to permit threading into and through threaded caster lock bore  183  of the square post  111  to engage against screw indent  218  to retain the caster assembly  145 , including jacking thread member  191  vertically within the square post  111  even if the table base  103  is lifted. The load flank nut  205  and locking screws  219  are used to enable precision setting, adjustment and maintenance of a desired height and proper leveling for the table  101 . In the load flank nut  205  shown, the provision of both lock apertures  217  and screw indents  218  enable retention to occur with one locking screw  219  independent of height adjustment which can be locked with another locking screw  219 . 
     A height adjustment nut  221  is preferably permanently attached to the lower end of the jacking thread member  191 , around the smaller diameter thread set  203  to provide a larger and manually accessible wrench engaging surface to enable an exacting height adjustment, under load, of an overall assembled table  101  without any need for support or disassembly. The same six sided hexagonal wrench engagement surface could be provided by an integrally formed surface, in lieu of the smaller diameter thread set  203  and fixed engaged height adjustment nut  221 , but the increased cost of manufacture would be prohibitive. Fixation of the height adjustment nut  221  with respect to the jacking thread member  191  can be accomplished with LOCTITE®, or by welding or other fixation method. Once the height adjustment nut  221  is attached over the smaller diameter thread set  203 , a threaded caster bore  207  opening to the underside of and within the smaller diameter thread set  203  has a set of internal threads  215  will be available below the load flank nut  205  and will be threadably engaged by other structures of the caster  107  (discussed below) to further provide support for structures below the smaller diameter thread set  203 . 
     Below the load flank nut  205  a height adjustment nut  221  will reside to enable wrench engagement and turning of the jacking thread member  191  and possibly set to maximum extent of travel through the load flank nut  205  which corresponds to a lowest height setting for the table  101 . Caster  107  has a threaded post  225  that fits into the downwardly opening threaded caster bore  207  concentrically within the smaller diameter thread set  203 . A threaded post swivel housing  227  supports the threaded post  225 . Swivel housing  227  is freely rotatable with respect to a wheel support member  229 , typically having internal ball bearings (not shown) between wheel support member  229  and swivel housing  227  for free motion and long life. Wheel support member  229  rotatably supports a wheel  231 . 
     Referring to  FIG. 4 , an end view of support cross member  131 , for example, taken along line  4 - 4  of  FIG. 3  may be identical to that for any of the support cross members  121 ,  125 ,  131 , &amp;  135  shown in  FIGS. 1-3  both as to size attributes and internal details. The cross member  131  has a first wall  251  attached to a common wall  253 , with common wall  253  further attached to a second wall  255 . Walls  251 ,  253 , &amp;  255  need not be perfectly planar and may have less sharp edges but are generally planar and are at right angles with respect to each other. Wall  251  is generally parallel and opposite wall  255 . First and second walls  251  and  255 , at their farthest point from common wall  253 , are attached to the abbreviated height first and second outer slot end walls  261  and  263 , respectively. 
     A first inner slot wall  265  extends from the first wall  251  and extends in the direction of second wall  255  parallel and spaced apart from the common wall  253  to form a first inner slot  267  between the first inner slot wall  265  and common wall  253 . A second inner slot wall  271  extends from the second wall  255  and extends in the direction of first wall  251  parallel and is spaced apart from the common wall  253  to form a second inner slot  273  between the second inner slot wall  271  and common wall  253 . Second inner slot  273  is opposite a first inner slot  267 . A first outer slot wall  275  extends from the first wall  251  and in the direction of second wall  255 . First outer slot wall  275  is parallel and spaced apart from the first outer slot end wall  261  to form a first outer slot  277  between first outer slot wall  275  and first outer slot end wall  261 . A second outer slot wall  281  extends from the second wall  255  and in the direction of first wall  251  parallel and spaced apart from the second outer slot end wall  263  to form a second outer slot  283  between second outer slot wall  281  and second outer slot end wall  263 , and opposite first outer slot  277 . 
     The first and second inner slots  267  &amp;  273  and the first and second outer slots  277  &amp;  283  provide guided support for the corner bracket  151  both between the first and second walls  251  and  255  and laterally between the common wall  253  and the between outer slot end walls  261  and  263  in each of the support cross members  121 ,  125 ,  131 , &amp;  135 . The use of cross members  121 ,  125 ,  131 , &amp;  135  which are the same shape and cross sectional size, and that can be cut from a single length of extrusion will further enable stocking a single long extrusion that can be quickly and easily cut to various length cross members  121 ,  125 ,  131 , &amp;  135  as needed for different lengths of horizontal support. 
     Referring to  FIG. 5 , a view taken along line  5 - 5  of  FIG. 3 , which is a plan view of the square post  111  looking into and through the square post  111  which may be an extrusion of constant cross sectional detail. An ability to use an extrusion for posts  111  further enables stocking a single long extrusion that can be quickly and easily cut to various lengths as needed for different length support as needed. As can be seen square post  111  has a constant cross section and is divided into five main spaces. 
     There are a series of four corner spaces  311 . Each of the corner spaces  311  are bound by an outer wall  315  of the square post  111  that supports the flat side  181 . Each of the corner spaces  311  is also bound by a pair of a series of four supports  317  that connect an inner tube  321  to the outer wall  315 . Each corner space  311  is also bound by a portion of the inner tube  321  not adjacent the outer wall  315 . The material of the four supports  317  is also used as a solid volume support structure that can be tapped to create threads, bores or apertures as needed, such as threaded cross member attachment bore  187 , and the threaded caster lock bore  183 . 
     The interior of inner tube  321  includes a series of circumferentially inwardly disposed axial ribs  323  which are used for stability and provision of anti-rotational engagement. Since  FIG. 5  is an end view, the ribs  323  can be used to stabilize anti-rotational engagement throughout the length of the opening  185  at any vertical level inside the inner tube  321 . The use of four ribs  323  helps to register external entry of load flank nut  323  as well as the vertical translation and stabilization guide plate  189 , as will be shown in greater detail. 
     Referring to  FIG. 6 , a perspective view of the load flank nut  205  illustrates expanded details. About the general upper cylindrical shape, a series of grooves  325  defines the quarter radial extent of a series of quarter radial rib sections  327  that substantially form an outer cylindrical body shape. The lower flange  211  can be seen as having a diameter slightly larger than the inner diameter of the opening  185  of the square posts  111 . Lower flange  311  prevents entry of the load flank nut  205  into the opening  185  at the level of the lower flange  211 . The rib sections  327  are slightly less in diameter than the internal diameter of the inner tube  321  sufficient to permit entry of the inwardly disposed axial ribs  323  of the inner tube  321  of the square post  111  which was seen in  FIG. 5 . The series of grooves  325  will accommodate the series of circumferentially inwardly disposed ribs  323  during axial entry the load flank nut  205  into the inner tube  321  and also register the load flank nut  205  such that one of the lock apertures  217  and one of the screw indents  218  can each align with adjacent located single threaded caster lock bores  183 . 
     The screw indents  218  enable selective retention and locking of the caster assembly  145  and height locking by engagement with the main load flanked thread  201 , when the load flank nut  205  is brought within opening  185  of the inner tube  321 . The screw indents  218  are oriented opposite each other, and the lock apertures  217  are also located opposite each other. Thus, the user can insert one locking screw  219  into one threaded caster lock bore  183  of one flat surface  181  and insert another locking screw  219  into a threaded caster lock bore  183  of a next most adjacent flat surface  181  to be assured that one locks the height adjustment and the other secures the caster assembly  145  into its associated square posts  111 . 
     This configuration ultimately enables the square post  111  to have a load bearing relationship with the caster assembly  145  and also enables the inner tube  321  of square post  111  to accept the portion of the main load flanked thread  201  above the load flank nut  205  within the inner tube  321  depending upon a given height adjustment of the table  101 . Partially seen inside an opening  335  at the top of the load flank nut  205 , are the internal threads  215 . The main load flanked thread  201  will engage the internal threads  215  jacking thread member  191  to pass completely through the load flank nut  205 . 
     Referring to  FIG. 7 , an expanded upper perspective view of the vertical translation and stabilization guide plate  189  seen in  FIG. 3  illustrates a series of four oppositely disposed repeating structures which provide lateral stability to the top of the jacking thread member  191  when it is within the opening  185  within the inner tube  321  of square post  111 . A series of radial end pairs have curved ends  339  and are each interrupted by a guide slot  341 . Guide slots  341  will also accommodate the series of circumferentially inwardly disposed ribs  323  during axial entry of the vertical translation and stabilization guide plate  189  into the inner tube  321 . Guide slots  341  will also register the vertical translation and stabilization guide plate  189  when it is brought within opening  185  of the inner tube  321 . A series of indentations  343  is provided between each subsequent set of radial end pairs to help an assembler to more easily manipulate the vertical translation and stabilization guide plate  189  to position it for insertion. A central aperture  345  is provided to accommodate and fit around the small boss  199 . 
     Referring to  FIG. 8 , an upper perspective view of a square post  111  as was seen in  FIGS. 1-3  is shown in a broken fashion to emphasize the location and orientation of threaded cross member attachment bores  187  and threaded caster lock bore  183 . It is understood that for a rectangular single support cell not having connection with other cross members  121 ,  125 ,  131 , &amp;  135 , that each square post  111  may then be a corner post and will have its two adjacent flat sides  181  fitted with threaded cross member attachment bores  187 . When a given square post  111  is part of more than one rectangular cell, it may carry threaded cross member attachment bores  187  on three or perhaps upon every one of its flat surfaces  181 . In addition, it may carry more than one threaded caster lock bore  183 , although only one is needed to secure a given caster assembly  145  within a single square post  111 . Providing single square posts  111  with the ability for multiple intermediate levels of cross members in addition as cross members  121 ,  125 ,  131 , &amp;  135  simply means that more sets of threaded cross member attachment bores  187  would need to be provided a different levels. This is not to say that any cross member, such as cross members  121 ,  125 ,  131 , &amp;  135  must necessarily occupy a given level, but the attachment of any additional cross members  121 ,  125 ,  131 , &amp;  135  will contribute to the strength of any configuration of the table base  103 . 
     In  FIG. 8 , a broken swath separates an upper portion of square post  111  having two pairs of threaded cross member attachment bores  187  on two adjacent flat sides  181 . Flat sides  181  are separated by a brief curved surface as a curved transition  351  to help lessen injury from any inadvertent human contact with an otherwise sharp transition with a right angle corner that might otherwise exist between flat sides  181 . The two pairs of threaded cross member attachment bores  187  on the upper portion of square post  111  are positioned high enough, as will be shown, to enable upper cross members  121  &amp;  131  be generally even with the top of the square post  111  to provide more surface support area to a planar structure gathering support from the table base  103 , such as top  105 . 
     Conversely, in  FIG. 8 , the lower portion of square post  111  below the broken swath is also shown as having two pairs of threaded cross member attachment bores  187  on two adjacent flat sides  181 , but the threaded bores shown below the broken swath represent the lowermost pairs of threaded cross member attachment bores  187  which would be expected to support the lower cross members  125  &amp;  135 . In the embodiment shown, some additional dimension is provided between the lowermost threaded cross member attachment bore  187  and the threaded caster lock bore  183  but there need not be significant spacing unless a square post  111  had threaded cross member attachment bores  187  on all four sides such that one of four threaded cross member attachment bores  187  might physically conflict with a threaded caster lock bore  183  due to a potential common proximity. Note that because bores  183  and  187  are at the center of any flat side  181 , so that entry into the square post  111  will be at least partially into the material of the four supports  317  located between the outer wall  315  and the inner tube  321 . Note that table  101  can be produced with a table base  103  without casters in a cubic shape, such as by using feet (not shown) attached to the end of the jacking thread member  191 . 
     Referring to  FIG. 9 , is a side plan view taken along line  9 - 9  of  FIG. 4  is a view looking into the inside and near the end of cross member  131 , but in the embodiment of the sturdy lightweight table base  103  shown in the Figures with even sized cross members  121 ,  125 ,  131 , &amp;  135 , the details of one end of cross member  131  will be the same as the details of all ends of the other cross members shown in  FIGS. 1-9 . The pair of square punched holes  165  are more clearly seen and arranged vertically with respect to the cross member  131 , and parallel to the square-cut butt end  169 . From the plan view looking into the open end between first and second outer slot end walls  261  and  263 , the common wall  253  can be seen, but few other details. 
     Referring to  FIG. 10 , as an alternate example is a side plan view similar to that seen in  FIG. 9  but illustrating a cross member  355  which may be smaller in width, but particularly in height, with respect to the dimensioning seen for cross member  131 . A pair of square punched holes  165  is seen to be arranged horizontally with respect to the cross member  355 , and parallel to the linear extent of the cross member  355 . Where the vertical height of cross member, such as one of cross members  121 ,  125 ,  131 , &amp;  135 , begins to be vertically reduced, a vertical alignment of square punched holes  165  would force a closer spacing of square punched holes  165  which is undesirable from an assembly tool interference standpoint. The arrangement of cross member  355  is simply one alternative embodiment that may be of advantage as cross member  355  size becomes smaller. 
     Referring to  FIG. 11 , a perspective view of the corner bracket  151  seen in  FIGS. 2 &amp; 3  is shown. Each of the corner brackets  151  has an overall “J” shape when viewed vertically and may preferably have a constant overall height. A first planar member  171  is used for inserting the corner bracket  151  into and adjacent the common wall  253  of the cross members  121 ,  125 ,  131 , &amp;  135 . First planar member  171  is guided by first and second inner slot  267  &amp;  273  of horizontal member  131  seen in  FIG. 4 . A second planar member  173  may generally be at a right angle to the first planar member  171  and may ultimately be located adjacent to the butt end  169  to lie opposite the square post  111  when cross member  121  is brought adjacent square post  111 . Second planar member  173  is guided by inside portions of first and second walls  251  &amp;  255  of horizontal member  131  seen in  FIG. 4 . 
     An abbreviated third planar member  175  extends from the second planar member  173 , may generally be at a right angle to the second planar member  173  and may extend away from the second planar member  173  parallel to and in the same direction that the first planar member  171  extends from the second planar member  173 . Abbreviated third planar member  175  is guided by first and second outer slot  277  &amp;  283  of horizontal member  131  seen in  FIG. 4 . 
     First, second and third planar members  171 ,  173  &amp;  175  may preferably be of the same height with each having an upper edge  357  and a lower edge  359 . Even height enables all of the upper and lower edges  357  and  359  to fit within the cross members  121 ,  125 ,  131 , &amp;  135  with better and more extended support. The second planar member  173  upper and lower edges  357  and  359  are separate from the upper and lower edges  357  and  359  of planar members  171  and  175 . A series of four notches that result from material removed predominantly considered from a face of second planar member  173 , including a pair of notches  361  adjacent first planar member  171  and a pair of notches  363  adjacent third planar member  175 . All of the notches  361  &amp;  363  are of sufficient width to enable first and second inner slot walls  265  and  271  and first and second outer slot wall  275  and  281  to slide past when the corner bracket  151  is guidably inserted past its respective butt end  169  of one of the cross members  121 ,  125 ,  131 , &amp;  135 . 
     Referring to  FIG. 12 , a view taken along line  12 - 12  of  FIG. 11 , which is a plan view of the corner bracket  151  facing second planar member  173 , illustrates a profile oriented to be inserted into one end of one of the cross members  121 ,  125 ,  131 , &amp;  135 . The view of  FIG. 12  best illustrates the openness of the notches  361  and  363  to provide clearances for the first and second outer slot walls  265 ,  271 ,  275  and  281  to be accommodated upon insertion of the corner bracket  151  into one end of one of the cross members  121 ,  125 ,  131 , &amp;  135 . 
     Referring to  FIG. 13 , a view taken along line  13 - 13  of  FIG. 12 , is a plan view looking down on the top of the corner bracket  151  and illustrates the right angled relationship of preferably integrally formed first, second and third planar members  171 ,  173  and  175 . However, the main concern for easy insertion into the cross members  121 ,  125 ,  131 , &amp;  135  is that the first, and third planar members  171  and  175  are parallel to each other so that they will facilitate insertion into and sliding translation and guided support within slots  267 ,  273 ,  277  and  283 . First and second oppositely oriented inner slots  267  &amp;  273  will guide portions of the first planar member  171  adjacent its supper and lower edges  357  &amp;  359 , while first and second oppositely oriented outer slots  277  and  283  guide portions of the third planar member  175  adjacent its supper and lower edges  357  &amp;  359 . First and Third planar members  171  and  175  are sufficiently parallel to be inserted within one end of one of the cross members  121 ,  125 ,  131 , &amp;  135  and guided to a position where the securing apertures  177  of corner bracket  151  align with the pair of square punched holes  165  to enable corner bracket  151  to be joined to its associated cross members  121 ,  125 ,  131 , or  135 . 
     Referring to  FIG. 14 , an expanded upper perspective view of a horizontally oriented cross member  131  and corner bracket  151  as was seen in  FIGS. 2, 3, 4, 9 , &amp;  11 - 13  is shown in a position which facilitates an explanation of a portion of the process of assembly. A preferred order of assembly involves an initial attachment of the corner bracket  151  to the cross member  131 . First, the corner bracket  151  is oriented for movement toward one of the butt ends  169  of the cross member  131 . First planar member  171  will enter the space between the first wall  251  and second wall  255  closest to the common wall  253 , with the upper edge  357  and lower edge  359  of the first planar member  171  fitting within first and second oppositely oriented inner slots  267  and  273 . 
     Further movement will then cause the third planar member  175  to enter the cross member  131 . The upper and lower edges  357  &amp;  359  of the third planar member  175  then lie closely adjacent the first and second walls  251  &amp;  255 , respectively. The upper edge  357  and lower edge  359  of the third planar member  175  will be guided into and fitting within first and second oppositely oriented outer slots  277  and  283 . 
     Further movement of the corner bracket  151  into the cross member  131  will eventually cause the first and second inner slot walls  265  &amp;  271 , and the first and second outer slot walls  275  &amp;  281  to move through the notches  361  and  363  respectively as the second planar member  173  passes the butt end  169  and enters within the cross member  131 . The upper edge  357  and lower edge  359  of second planar member  173  then lies closely adjacent first and second walls  251  &amp;  255 , respectively. Further movement of the corner bracket  151  into the cross member  131  will cause the third planar member  175  to pass through and clear the butt end  169  fitting completely within the cross member  131 . When the corner bracket  151  is only a short distance into the cross member  131 , the securing apertures  177  of the first planar member  171  are set to align with the pair of square punched holes  165 . Such alignment creates a slight inward displacement of the second planar member  173  with regard to the butt end  169  of the cross member  131  which may also be known as an inset. 
     After alignment of the securing apertures  177  and square punched holes  165 , a pair of carriage bolts  155  is inserted through their respective square punched holes  165 . The carriage bolts  155  by their design are rotationally locked with respect to the square punched holes  165  to eliminate the requirement to hold a wrench onto the outside of the common wall  253  when they are being secured by their respective flange nuts  157 . Carriage bolts  155  have a smoother outer profile that tends to reduce the chances unwanted engagements with cords and any other objects that might be encountered around the table base  103 . 
     The preferably locking pair of serrated flange nuts  157  are then tightened into place on their respective carriage bolts  155 . It may be preferable to attach both of the brackets  151  to both ends of all of the cross members  121 ,  125 ,  131 , &amp;  135  before beginning further assembly of the table base  103 . Once a corner bracket  151  is secured with respect to the cross member  131 , that butt end  169  of the cross member  131  is ready to be attached to the square posts  111 . 
     The insertion of the serrated locking flange head screws  161  into the cross member attachment bores  187  carried by one of the square posts  111  seen in  FIG. 8 , will be performed by manual or linear drive tool insertion into the area between outer slot end walls  261  and  263  of the cross member  131 . A special flex drive tool may enable construction to proceed more rapidly. Serrated locking flange head screws  161  may preferably be inserted through the securing apertures  179  of the second planar member  173  of corner bracket  151  before the cross member  131  is brought into approach to a square post  111  for better visual and more controlled threaded start of the serrated locking flange head screws  161 . 
     Referring to  FIG. 15 , an expanded upper perspective view of the horizontally oriented cross member  131  and corner bracket  151  (as was seen in  FIGS. 2, 3, 4, 9 , &amp;  11 - 14 ) is similar in orientation as  FIG. 14  except that the component parts now seen in  FIG. 15  are assembled. The vertical square post  111  of  FIG. 8  which is not shown in order to avoid obscuring details.  FIG. 15  also has a portion of the first wall  251  of the cross member  131  removed to give a more complete view of the attachment details in  FIG. 15 . The pair of flange nuts  157  are seen fastened onto the pair of carriage bolts  155 . Note the limited access space between the outer slot end walls  261  and  263 , and the closeness of the flange nuts  157  and carriage bolts  155  to the corner bracket  151 . 
     Thus,  FIG. 15  illustrates the position and extent of the manual insertion to a point of manual elimination of looseness that would be present if square post  111  (not shown in  FIG. 15 ) were present. This view best illustrates an inset dimension  365  (shown by the a distance between oppositely oriented arrows) and which is the length to which the outside of the second planar member  173  is distanced from the a planar cut outer surface or edge of the butt end  169  of cross member  131 . The magnitude of the inset dimension  365  that has been shown to work well with either a nominally sized three inch by two inch cross member  131  is about thirty to forty one-thousandths of an inch (approximately one millimeter). The choice of materials, dimensions and thickness for the corner bracket  151  may dictate a different inset dimension  365 . 
     It is reminded that the butt end  169  is prepared by cutting in a plane orthogonal to an axis of the cross member  131  and that the end edges of the first and second walls  251  &amp;  253 , common wall  253 , and inner and outer slot walls  265 ,  267 ,  271  &amp;  273  and outer slot end walls  261  and  263  at butt end  169  are in the same plane, and provide surface area of contact with the flat surfaces  181  of the square post  111  (not shown in  FIG. 15 ). The butt end  169  is the result of an easily formed right angled cut to a longer extrusion. Thus right angled accuracy can be obtained with the simplest of tools for cutting an extrusion to form the cross members  121 ,  125 ,  131 , &amp;  135  from a longer extrusion. The plane of the butt end  169  and the plane of the second planar member  173  is shown as having a parallel lateral orientation with respect to the lower edge of the second wall  255  of cross member  131 . 
     Referring to  FIG. 16 , an end view of the assembled horizontally oriented cross member  131  and corner bracket  151  taken along line  16 - 16  of  FIG. 15  is seen generally as combining the view of the horizontally oriented cross member  131  of  FIG. 4  with the view of the corner bracket  151  similar to the view seen in  FIG. 12 . To the left, the carriage bolts  155  have a low profile with respect to the common wall  253 . In the middle of the cross member  131 , the relatively close fit and close guidance between the corner bracket  151  and the cross member  131  is readily observable, with any clearances seen being provided for illustrative purposes only. Force exerted on the back side of the second planar member  173  by the pair of serrated locking flange head screws  161  and toward the viewer observing  FIG. 16  will be laterally controlled and guided depending upon the thicknesses, tolerances and materials provided for the corner bracket  151  and cross member  131 . 
       FIG. 16  is a view which facilitates a further discussion of sizes. It is clear that the component parts of the table  101  and table base  103  can be made of any dimension from a miniature structure to an oversized structure. The dimensions that have been shown to work well for a table  101  that can be used as a work bench or utility table include a cross member  131  having sizes that may be conveniently based upon the 1924 American Lumber Standard (ALS) sizes to help increase the probability of interfitting with accessory structures that may also have been designed for compatibility with lumber. 
     Referring to  FIG. 17  is a side view looking into the inner side of a cross member  131  just after the corner bracket  151  is already attached with carriage bolts  155  to the horizontal cross member using the flange nuts  157  and at the point in time when the horizontal cross member  131  is brought into an aligned position with respect to the square post  111 . Bringing the horizontal cross member  131  into position so that the butt end  169  of the cross member  131  is near or contacts flat against the flat side  181  of the square post  111  in anticipation of threaded serrated locking flange head screws  161  (not seen in  FIG. 17 ) being guided through the securing apertures  179  into attachment bores  187  of posts  111  will enable careful visualization of the threaded start. 
     Where a vantage point of  FIG. 17  is possible, the threaded cross member attachment bores  187  and serrated locking flange head screws  161  can be in the space between second planar member  173  and the square post  111 . Other advantages will have a narrower view between the butt end  169  of the cross member  131  and the square post  111 . The serrated locking flange head screws  161  are not seen in  FIG. 17  for clarity, which configuration may also be consistent with guiding the horizontal member  131  and its corner bracket  151  threaded engagement with the square post  111  before insertion of the serrated locking flange head screws  161  through the securing apertures  179 , another sequential possibility for steps of assembly. 
     Hand tightening, and without further tightening, the second planar member  173  would be in a position as seen in  FIG. 17  and still include an open inset dimension  365 . The purpose of such inset dimension  365  is to provide a space within which the second planar member  173  may be urged in a direction toward an associated square post  111  to which the second planar member  173  is to be attached. The strength of connection may be obtained by urged force displacement of the second planar member  173 , with or without various forms of deformation and bending of second planar member  173 . If pairs of serrated locking flange head screws  161  were to be present in  FIG. 17 , they could be seen in the view of  FIG. 17  crossing the inset dimension  365 . The view of  FIG. 17  is that of an uppermost cross member  131  that is engaged even and flush with the top of square post  111 . This enables an extended area structural support surface available to an upper structure, such as planar top  105  or other structure. 
     Referring to  FIG. 18 , a view similar to that seen in  FIG. 17  illustrates the presence of serrated locking flange head screws  161  and their being tightened to urge a portion of second planar member  173 , typically on the side most closely adjacent third planar member  175  to a position where it appears to visually eliminate the inset dimension  365  when seen from the viewpoint of  FIG. 18 . In practice, and depending upon the choice of materials for the corner bracket  151 , and also depending upon recommended torque for the serrated locking flange head screws  161  within the threaded cross member attachment bores  187 , the displacement of the second planar member  173  toward the square post  111  may sometimes occur to a lesser extent than that shown in  FIG. 18 . 
     In any event, a springing force pulls the upper cross member  131  toward the square post  111  once the serrated locking flange head screws  161  are tightened beyond the force created with simple unaided finger tightening. Beyond finger tightening, each turn of the serrated locking flange head screws  161  urges the second planar member  173  toward the square post  111  perhaps until the side of the second planar member  173  on the side most closely adjacent third planar member  175  makes contact with the square post  111 . Up to this tightness, the force is expected to be obtained by springing force perhaps little or no significant force by deformation. 
     Once the corner between the second and third planar members  173  &amp;  175  makes contact with the square post  111 , Further tightening may begin deformation, and thus may begin to fold a portion of the second planar member  173  at an area between its initial contact with the square post  111  and the portion of the planar member  173  adjacent the securing apertures  179 . This may continue until the side of the second planar member  173  most closely adjacent third planar member  175  makes flat contact with the square post  111 . It is during the aforementioned deformation action that further tightening may also begin to pull and slightly stretch the portion of the second planar member  173  on the side most closely adjacent first planar member  171 . Such pulled stretching also operates against the first and second inner slot walls  265  &amp;  267  as the second inner slot wall  271  makes an angular shape between the securing apertures  179 , and the first planar member  171 . 
     Referring to  FIG. 19 , a plan view looking down along line  19 - 19  of  FIG. 18  illustrates the shape of the second planar member  173  of the corner bracket  151  after deformation due to tightening of the threaded serrated locking flange head screws  161  through the securing apertures  179  (not shown in  FIG. 19 ). The second planar member  173  is more clearly shown as having a flat portion adjacent the third planar member  175  and an angled, possibly stretch or tension portion adjacent the first planar member  171 . 
     The mechanisms of deformation of the of the second planar member  173  may vary widely depending upon materials and their thicknesses. The tension action may also depend upon the ability of the first and second inner slot walls  265  &amp;  267  to constrain the first planar member  171 . 
     Note that along the width of the area of the second planar member  173  between the serrated locking flange head screws  161  and the corner between first and second planar member  171  &amp;  173  that there is very little room for deformative “give”, assuming that the first and second inner slots  267  &amp;  273  are able to continue to guide and constrain the first planar member  171 . What may occur is a combination of a tension and a clamping pull by the serrated locking flange head screws  161 . The angular bend between the first and second planar member  171  &amp;  173  may also contribute to the force of pull of the horizontal cross member  131  toward the square post  111 . To the extent that it may be characterized based upon some of the dimensions disclosed, an angle  371  as seen in  FIG. 19  may be between about five and ten degrees. However, much will depend on the size of the cross member  131 , the thickness and materials of the corner bracket  151 , and the inset dimension  365 , to name a few. 
     Referring to  FIG. 20 , a perspective view into an inside corner of a square post  111  having longer upper cross member  121  and the shorter upper cross member  131  attached to a vertical square post  111  at a same vertical height is shown. As can be seen, access to the serrated locking flange head screws  161  for either of the cross members  121  or  131  is facilitated despite the close proximity of the cross members  121  and  131 .  FIG. 20  is a first partial illustration giving an appreciation of the symmetry of components that make up table base  103 .  FIG. 20  also provides a visual emphasis of the independence and non-interference that any two of the cross members  121 ,  125 ,  131 ,  135  have with respect to each other upon their attachment to square post  111 . Although only one additional level of support for cross members  121  &amp;  131  is shown, several heights of horizontal cross member support can exist on a given square post  111  and the cross members  121 ,  125 ,  131 , &amp;  135  and more need not be at the same height as each other, especially where other accessories could benefit from different heights of a number of cross members such as cross members  121 ,  125 ,  131 , &amp;  135 . 
     Referring to  FIG. 21 , a further expanded perspective view of the exploded components of the wheel assembly  145  shown in  FIG. 3  is seen. In addition to the structures identified in  FIG. 3 , an aperture  375  is seen in washer  195 . Washer  195  enables the threaded member  193  to project a larger diameter securing force to hold the vertical translation and stabilization guide plate  189  around the small boss  199  through a bore  377  that accepts the small boss  199 . The height adjustment nut  221  is shown adjacent the smaller diameter thread set  203 . It will facilitate visualization of interfit with the smaller diameter thread set  203 , even though upon assembly the fixed operation of the height adjustment nut  221  and the smaller diameter thread set  203  from which it depends will be below the load flank nut  205 . The larger diameter height adjustment nut  221  will also help to limit the extent to which the main load flanked thread  201  can pass upwardly through the load flank nut  205 . 
     Referring to  FIG. 22 , a further expanded plan view of the partially assembled jacking thread member  191  with the threaded member  193  is shown in a position to engage washer  195  and to be threadably inserted into the small upper threaded bore  197  (not seen in  FIG. 22 ). The threaded member  193  will bring the washer  195  in place against the vertical translation and stabilization guide plate  189  to hold it in place. The height adjustment nut  221  is shown in phantom to better illustrate the smaller diameter thread set  203 . 
     Referring to  FIG. 23 , a view looking down upon the rectangular structure of the assembled table supports in an assembled condition similar to that shown in  FIG. 1 , but with the plain planar top  105  not shown and with the wheel assemblies  145  not shown in order to provide an unfettered expanded plan view of a basic resulting cell. The longer upper cross members  121  and shorter upper cross members  131  are each shown as having a pair of ends connected to the vertical posts  111 . Any pressure diagonally from one square post  111  to its diagonal opposite will create an opening or widening force that will be resisted by a resistance to widening of the two diagonally located posts. The other set of diagonal posts will simultaneously resist closing or narrowing. These two sets of stable resistive forces will make a resulting horizontal rectangular cell structure  381  very strong. 
     It is understood that the horizontal rectangular cell structure  381  shown is only a top view illustrating the upper cross members  121  &amp;  131 . Other cross members  125  &amp;  135  and other possible cross members at a lower level (not shown) can be placed to further strengthen other rectangular cell structures  381 . A given closed rectangular cell structure  381  may be able to provide greater strength of all the members  121  and  131  if located at the same level, but as before, location at a same vertical level need not be required. Where different levels of the cross members  121  and  131  occur, the strength of the posts  111  should be sufficient to withstand any torsional effects from their availability to act at different vertical levels through vertical lengths of the posts  111  through which they act. In the table base  103  shown in the figures, two such given closed rectangular cell structures  381  occur. 
     Referring to  FIG. 24 , a side plan view looking into a closed vertical rectangular structure  383  formed by upper and lower cross members  121  &amp;  125  and two attached square posts  111  is shown. For an upper and lower closed horizontal rectangular cell structure  381  (one of which was seen in  FIG. 23 ) four closed vertical rectangular structures  383  will be present (only one of which is seen in  FIG. 24 ). Thus, the combination of the two, vertically separated, horizontal closed rectangular cell structures  381  and the four closed vertical rectangular structures  383 , formed by a given single table base  103 , synergize to form a very strong structure that can provide exacting support that can be used in a high precision environment and enables production of an extremely sturdy table  101 . 
     Referring to  FIG. 25 , a perspective view of one possible realization of an attachment bracket  401  for securing the table top  105  to a table base  103  both seen in  FIG. 1 , is shown. More directly, the attachment bracket  401  will attach the table top  105  to an uppermost, adjacent horizontal cross member  121 ,  131 . Attachment bracket  401  has a cross member engagement portion  405 , and a table top engagement portion  407 . The table top engagement portion  407  that includes a plate  411  that may be integrally formed with a pair of spaced apart inclined structural supports  413  that strengthen the support between the cross member engagement portion  405  and table top engagement portion  407 . The plate  411  may have one or more apertures  415  to facilitate threaded engagement of the plate  411  to another structure such as the underside of the plain planar top  105 . 
     The table top engagement portion  407  as viewed laterally includes a first wall  421  that may be formed integrally with the plate  411  and is further enforced with the connectivity of the spaced apart inclined structural supports  413 . A second wall  423  may be formed integrally with first wall  421 . A third wall  425  may be formed integrally with the second wall  423 . As can be seen, plate  411  and the first, second and third walls  421 ,  423 , &amp;  425  may or may not have a relative similar thickness. When formed integrally, the structures extend from a first end  427  at a non-attached end of plate  411  opposite the first wall  421 , and extending to a second end  429  at the non attached end of the third wall  425  opposite attachment to the second wall  423 . 
     First, second and third walls  421 ,  423 , &amp;  425  laterally viewed, may have an unbalanced “U” shape, with the third wall  425  having a shorter extent, terminating at second end  429  in order to accommodate the thickness of the first wall  251  of the uppermost cross members  121  &amp;  131 , as seen in  FIG. 4 . The space within the First, second and third walls  421 ,  423 , &amp;  425  should also provide clearance for fitting around the outer slot end wall  261  and second outer slot wall  275 . In order that the planar top  105  fit securely and to be the least moveable with respect to the table base  103 , the structures of engagement on the attachment bracket  401  may vary. 
     For example, an attachment bracket  401  may be sized to interfit with any structural details of the upper opening of the upper cross members  121  and  131  for stabilization by the upper cross members  121  and  131  as well as a pre-selected bearing engagement. Second end  429  may be set to bear against the first wall  251  of the uppermost cross members  121  &amp;  131  or to simply provide clearance. Second wall  423  can be set to bear against the lowermost ends of the outer slot end wall  261  and first outer slot wall  275  of the cross members  121  &amp;  131  for a snug fit. Further the plane of the plate  411  may have an angle slightly greater than a right angle with respect to the plane of first wall  421  so that some tension may be applied by second wall  423  and/or the second end  429  to any structure of the cross members  121  &amp;  131  once the plate  411  has a strength attachment to the bottom of the plain planar top  105 . Many other variations in the design and formation of the attachment bracket  401  are possible. 
     Referring to  FIG. 26 , a side view of the attachment bracket  401  of  FIG. 25 , taken along line  26 - 26  of  FIG. 25  illustrates the overall lateral shape of the attachment bracket  401 . Referring to  FIG. 27 , a top plan view of the attachment bracket  401  of  FIGS. 25 and 26 , taken along line  27 - 27  of  FIG. 26  illustrates the simplicity of the basic structure of bracket  401  and contemplates that larger brackets made of a greater extent with longer lateral width with multiple apertures  415  and additional structure. A multiple attachment, longer plate (not shown) which may be possibly made of repeating units of the attachment bracket  401  can be employed where it is known that a greater holding strength is needed with less handling of the individual units of attachment bracket  401  of  FIGS. 24-26 . 
     Referring to  FIG. 28 , an exploded view of an underside perspective arrangement illustrating a square post  111  with exploded views of an overhead tabletop  105 , attachment brackets  401  and threaded members  431  in a position to attach the table top  105 . One possible advantage in facilitated quick attachment might provide for table top  105  to be inverted and laid flat while the table base  103  rests upon it. In this orientation, the attachment brackets  401  distributed and easily attached to the table base  103  using power tools to rapidly engage the threaded members  431 . 
     The table base  103  can be used with any top that has a flat or otherwise compatible underside. Other top structures, such as table top  101  can achieve attachment both with the attachment bracket  401  as well as other structures. Table  101  provides significant advantage for use with a plain top, including an expanse of plywood, metal plate material, sheet wood or individual lengths lumber having a significant flat underside surface. In  FIG. 28 , a top  105  is seen as having a flat underside surface  441 . An adjacent upper cross member  121  has been removed for clarity and focus. Once the positions of the table top  105  and table base  103  are located with respect to each other as desired, an attachment bracket  401  is brought to a position over the outer slot end wall  261  and second outer slot wall  275 . The threaded member  431  can be inserted through the aperture  415  and into the underside surface  441  of the top  105 . As many of the attachment brackets  401  as desired can be used as needed, but it may be recommended to have a sufficient number to enable lifting of the table  101  as may normally happen for moving it over obstacles, up or down stairs, etc. 
     Referring to  FIG. 29 , an underside perspective view similar to that seen in  FIG. 28  is shown illustrating a position of final attachment and assembly of the component parts. There will likewise be easy access to the threaded members  431  in cases where the table top  105  needs to be removed. The attachment brackets  401  work well with single or multiple rectangular cell structures and can thus provide table top  105  holding attachment not only around a periphery of a large table  101 , but also anywhere an upper cross member  121 ,  131  is made to lie adjacent an underside surface  441  of a table top  105  or the like. 
     Referring to  FIG. 30  a perspective view of one example of a commercially available extrusion  451  is seen as a vertical length of structure having a number of features that enable multi utilization. At the bottom of the section of extrusion  451  shown, sides  453  are shown as divided by a central slot opening  455 . Central slot opening  455  leads to a laterally wider inside space  457  to facilitate engagement by a structure that might be restricted by the size of the central slot opening  455 . 
     The details of the cross section of the extrusion  451  are best seen at the top of  FIG. 30 . A generally square core  457  has a circular cross section bore  459 , and from what would otherwise be the four corners of the square core  457 , a set of four extensions  461  lead to what might be referred to as arrow shaped structures each having a pair of abbreviated exterior surfaces  463  that are oriented ninety degrees from each other and that are located across an adjacent curved transition as a curved corner  465 . Immediately behind the curved corner  465  is a bore  467 . Many other configurations of commercially available extrusion having other features are available and the extrusion  451  is an example. 
     Referring to  FIG. 31 , a downward view looking into the commercially available extrusion taken along lines  31 - 31  of  FIG. 30 , is shown with a lateral approach of the horizontally oriented cross member  131  illustrated by a pair of parallel arrows. The upper first wall  251  of the cross member  131  is removed to better illustrate a position corner bracket  151  and serrated locking flange head screws  161  engaging an adapter block  475 . The position and orientation of the cross member  131 , corner bracket  151  and adapter block  475  is such that an approach as shown by the arrows, and a lift over or lowering under the extrusion  451  will allow the adapter block  475  to enter the central slot opening  455  from an end of the extrusion  451 . Pre-attachment of the adapter block  475  to the serrated locking flange head screws  161  will enable more control than would be the case if the adapter block  475  enters slot opening  455  before insertion of the serrated locking flange head screws  161  through securing apertures  179  of the corner bracket at the time of initial threading into the adapter block  475 . 
     Referring to  FIG. 32 , an end view illustrates more fully the shape of the adapter block  475 . Although adapter block  475  could be of any shape that would allow it to be captured within the extrusion  451 , it is important that sufficient material be available for engaging the threads of the pair of serrated locking flange head screws  161 . Threaded bores  481 , of which one is seen in  FIG. 32 , substantially occupy the volume of the adapter block  475  for strength and ability to hold significant force. Other shapes are possible for the adapter block  475 , as well as the laterally wider inside space  457  of the commercially available extrusion  451 . 
     Adapter block  475  has a main side  485 , a pair of parallel lateral sides  487 , a pair of rear angled sides  489 . Referring to  FIG. 33  is a perspective view of the adapter block  475  enables a rear end side  491  two be seen along with the two, spaced apart threaded bores  481  can be seen. A first end  493  is seen, and a partial upper extent of second end  495  is seen at the uppermost part of  FIG. 33 . Referring to  FIG. 34 , a view of the extrusion  451  is seen with adapter block  475  shown in position within the laterally wider inside space  457 . The outer portions of main side  485  of the adapter block  475  engage the inside rear portions of the pair of abbreviated exterior surfaces  463  to keep the adapter block  475  stably retained within the inside space  457 . 
     Referring to  FIG. 35 , a side view in a position similar to that illustrating the positions of the structures in  FIG. 31 , an advantageous manner of assembly is suggested. If the adapter block  475  is engaged and threaded a short distance onto the threaded ends of the serrated locking flange head screws  161 , the cross member  131 , corner bracket  151  and adapter block  475  assembly of  FIGS. 31 and 35  is formed. Further, making-up this assembly before engagement with the extrusion  451  enables easier manual manipulation and access of the components. Once the assembly seen in  FIG. 35  is made up, the translation of this assembly around an end, including an upper end  497  or lower end  499  of the extrusion  451 , enables the adapter block  475  to be slidably inserted into the laterally wider inside space  457  of the extrusion  451 . The advantage of this technique is that less tightening and thread-start activity is required. Conversely, where multiple members  131  are to be fitted into one extrusion  451 , they may need to be loaded into the central slot opening  455  and later serially brought to their proper level before the serrated locking flange head screws  161  are further tightened to attach members  131  to fix their height with respect to the extrusion  451 . 
     Referring to  FIG. 36 , a view similar to the view of  FIG. 35  after the cross member  131  is brought level with the top of the extrusion and after the serrated locking flange head screws  161  are only partially tightened, but before further tightening causes deformation of the corner bracket  151 . Other surface enhancements and coatings (neither of which are shown) can be employed to further the ability of cross member  131  and adapter block  475  to resist vertical movement with respect to the and extrusion  451 . Other commercially available extrusions, like extrusion  451 , may require different accommodation structures that enable effective use of the cross member  131 . 
     While the present invention has been described in terms of a system for producing a wide range of sizes for a sturdy, square table support, the structures techniques employed herein are applicable to a wide range of devices and methods to provide easily producible and constructable components. Although the invention has been derived with reference to particular illustrative embodiments thereof, many changes and modifications of the invention may become apparent to those skilled in the art without departing from the spirit and scope of the invention. Therefore, included within the patent warranted are all such changes and modifications as may reasonably and properly be included within the scope of this contribution to the art.