Folding table with planar cross-brace

Abstract

A planar crossbrace for reinforcing the tabletop of a foldable table that folds in half, the planar crossbrace comprising an elongated rectangular planar portion having elongated opposite side edges and narrow opposite end edges, the opposite end edges being perpendicular to the side edges. A pair of opposite tabs extend from the opposite end edges in a direction perpendicular to the rectangular planar portion. A pair of opposite ribs extend from the opposite side edges in a direction perpendicular to the rectangular planar portion, forming an elongated channel having a U-shaped cross-section. The planar crossbrace reinforces the inner edges of the tabletop portion to which it is attached, and the reinforcement is independent of any connection to the inner edges of other tabletop portions. This eliminates any need for interlocking features on the inner edges of the tabletop portions, such as those required by prior art tables.

Description

Technical Field

[0001] This invention relates to the field of furniture. More particularly, this invention relates to a table having a folding tabletop, foldable legs, and a planar cross brace for supporting the central area of ​​the tabletop. Background Technology

[0002] Banquet tables and utility tables with foldable legs and bi-fold tabletops are well-known. Traditionally, a bi-fold tabletop comprises two tabletop halves formed from plastic by blow molding or injection molding, or from honeycomb panels, medium-density fiberboard (MDF), or other materials. When the table is unfolded to a usable position where the tabletop halves are aligned, the inner edges of the tabletop halves converge at the center of the tabletop. In some designs, such as those described in U.S. Patent No. 7,096,799 and... Figure 11 As described, the inner edges of the desktop half have interlocking and overlapping features, which are integrally formed into the molded desktop half. When the desktop half is aligned in the use position, the interlocking features 234 and overlapping features 236 of the two halves will interconnect to form a more rigid desktop.

[0003] While a rigid tabletop is desirable, incorporating fully interlocking and overlapping features within the tabletop half introduces further complexity and cost to the mold in which the tabletop half is formed. Furthermore, because these features are located at or near the mold parting line where the two mold halves converge, removing any plastic burrs at the mold parting line becomes more difficult. Burrs are easier to remove if the mold parting line coincides with a straight edge surface from which the features do not protrude. Therefore, eliminating the interlocking features would make the manufacturing process more efficient.

[0004] Therefore, what is needed is a folding desktop that is sufficiently rigid and has a flat surface along the inner edge of the desktop half, without molded interlocking features. Summary of the Invention

[0005] The aforementioned and other requirements are met by a foldable table having a tabletop, side rails, leg assemblies, hinge assemblies, a central support bracket, tubular cross brackets, and planar cross brackets. The table includes a first tabletop portion having a top surface, a bottom surface, a first inner edge, and a first outer edge, the first outer edge being parallel to the first inner edge. The table also includes a second tabletop portion having a top surface, a bottom surface, a second inner edge, and a second outer edge, the second outer edge being parallel to the second inner edge. The first and second inner edges are adjacent to each other when the table is in use and separated when the table is in a storage position.

[0006] The side rails include a pair of opposing first side rails and a pair of opposing second side rails. The first side rails are attached to the bottom surface of the first desktop portion between a first inner edge and a first outer edge, and the second side rails are attached to the bottom surface of the second desktop portion between a second inner edge and a second outer edge.

[0007] The table includes a first leg assembly and a second leg assembly. The first leg assembly is pivotally connected between first side rails to the bottom surface of a first tabletop portion, and the second leg assembly is pivotally connected between second side rails to the bottom surface of a second tabletop portion. The two leg assemblies extend downward from their respective tabletop portions when the table is in use and are positioned adjacent to their respective tabletop portions when the table is in storage.

[0008] The hinge assembly includes a pair of opposing hinge assemblies disposed on a hinge axis parallel to a second inner edge of the second desktop portion. Each hinge assembly connects one of the first side rails to one of the second side rails, such that the first desktop portion and the second desktop portion are operable to pivot relative to each other about the hinge axis.

[0009] A tubular cross bracket is positioned on the hinge axis between paired hinge assemblies and fixed to the bottom surface of the second desktop portion. A planar cross bracket is fixed to the bottom surface of the first desktop portion, adjacent to and parallel to its first inner edge.

[0010] A first central support bracket has a first end and a second end, the first end being pivotally attached to a first leg assembly and the second end being pivotally attached to a tubular cross bracket. A second central support bracket has a first end and a second end, the first end being pivotally attached to a second leg assembly and the second end being pivotally attached to a tubular cross bracket.

[0011] In some embodiments, the tubular cross brace includes opposing ends that are secured to opposing hinge assemblies.

[0012] In some embodiments, each hinge assembly includes a first hinge portion and a second hinge portion that are rotatably attached to each other. The first hinge portion of each hinge assembly is attached to one of a first side rail, and the second hinge portion of each hinge assembly is attached to one of a second side rail.

[0013] In some embodiments, the planar cross bracket includes a pair of opposing tabs disposed at opposite ends thereof. Each tab extends from the planar cross bracket in a direction perpendicular to the bottom surface of the first desktop portion, wherein each tab is secured to a corresponding portion of the first hinge portion. In some embodiments, each tab is welded to a corresponding portion of the first hinge portion.

[0014] In some embodiments, the planar cross bracket includes a pair of opposing ribs disposed along the outer edge of the central channel portion of the planar cross bracket. These ribs are configured to extend from the planar cross bracket in a direction parallel to the first inner edge of the first tabletop portion and perpendicular to the bottom surface of the first tabletop portion, thereby forming a U-shaped cross section within the central channel portion of the planar cross bracket.

[0015] In some embodiments, the planar cross bracket includes a plurality of holes disposed within a central channel portion, through which fasteners pass to secure the planar cross bracket to the bottom surface of the first desktop portion.

[0016] In some embodiments, the tubular cross bracket includes a plurality of holes through which fasteners pass to secure the tubular cross bracket to the bottom surface of the second desktop portion.

[0017] In some embodiments, the planar cross bracket includes an elongated rectangular planar portion having elongated opposing side edges and narrow opposing end edges perpendicular to the side edges. The planar cross bracket includes a pair of opposing tabs extending from one of the opposing end edges in a direction perpendicular to the rectangular planar portion. A pair of opposing ribs are disposed along the opposing side edges in a central region of the rectangular planar portion. These ribs are parallel to the opposing side edges and extend from the rectangular planar portion in a direction perpendicular to the rectangular planar portion, thereby forming a central channel with a U-shaped cross-section. The rectangular planar portion includes multiple pairs of opposing arcuate cutouts, each pair being disposed adjacent to a corresponding tab at one of the opposing end edges. The cutouts receive opposing legs of a first leg assembly, thereby allowing the first leg assembly to lie flat against the bottom surface of a first tabletop portion when the first leg assembly is in a folded position.

[0018] In some embodiments, the first desktop portion and the second desktop portion are formed of blow-molded plastic.

[0019] In some embodiments, the first inner edge and the second inner edge of the first desktop portion and the second desktop portion are linear and parallel to the hinge axis.

[0020] In some embodiments, a first leg assembly is pivotally connected to a first side track and a second leg assembly is pivotally connected to a second side track.

[0021] In some embodiments, a planar cross bracket is disposed between a first inner edge and a first outer edge of a first desktop portion, and a tubular cross bracket is disposed between a second inner edge and a second outer edge of a second desktop portion.

[0022] On the other hand, the embodiments described herein relate to a cross brace for reinforcing the desktop of a folding table. The cross brace includes an elongated rectangular planar portion having elongated opposing side edges and narrow opposing end edges, the opposing end edges being perpendicular to the side edges. A pair of opposing tabs extend from the opposing end edges in a direction perpendicular to the rectangular planar portion. A pair of opposing ribs extend from the opposing side edges in a direction perpendicular to the rectangular planar portion, thereby forming an elongated channel with a U-shaped cross-section.

[0023] In some embodiments, a plurality of holes are provided in the rectangular planar portion of the cross bracket. These holes are operable to receive fasteners for securing the cross bracket to a desktop.

[0024] In some embodiments, the cross brace further includes multiple pairs of opposing arcuate cuts. Each pair of cuts is positioned adjacent to a corresponding tab. Attached Figure Description

[0025] Other embodiments of the invention will become apparent from the detailed description taken in conjunction with the accompanying drawings, wherein elements are not drawn to scale to show details more clearly, wherein the same reference numerals indicate the same elements in several views, and wherein: Figure 1 A top perspective view of a foldable table in its use position according to a preferred embodiment is shown; Figure 2 A bottom perspective view of a foldable table in its use position according to a preferred embodiment is shown; Figure 3 A bottom perspective view of a foldable table with its legs folded according to a preferred embodiment is shown. Figure 4 The inner edge of one half of the tabletop of a foldable table according to a preferred embodiment is shown; Figure 5 The inner edge of the other half of the tabletop of the foldable table according to a preferred embodiment is shown; Figure 6 The junction of the inner edges of the two tabletop halves of a folding table in the use position according to a preferred embodiment is shown. Figure 7 A planar cross bracket and a tubular cross bracket are shown at the junction of the two tabletop halves of a folding table in the use position according to a preferred embodiment; Figures 8A to 8D A planar cross support for a folding table according to a preferred embodiment is shown; Figure 9 and Figure 10A foldable table in a partially folded position, according to a preferred embodiment, is shown; and Figure 11 A prior art folding table is shown. Detailed Implementation

[0026] like Figures 1 to 10 As shown, the folding table 10 has a tabletop 12, which includes a first tabletop portion 12a and a second tabletop portion 12b. Figure 1 and Figure 2 In the usage position shown, the tabletop 12 is supported by a first leg assembly 16 and a second leg assembly 14 extending downward from the tabletop 12. The first leg assembly 16 includes legs 24a and 24b and a first cross member 28, the upper ends of which are attached to the first cross member 28. The first cross member 28 is pivotally attached at one end to a first side rail 30a and at the other end to an opposing first side rail 32a. The second leg assembly 14 includes legs 22a and 22b and a second cross member 26, the upper ends of which are attached to the second cross member 26. The second cross member 26 is pivotally attached at one end to a second side rail 30b and at the other end to an opposing second side rail 32b. The first leg assembly 16 includes hinged supports 20a and 20b, which are pivotally connected to legs 24a and 24b, respectively, and pivotally connected to a first end of a central support bracket 40a to hold the first leg assembly 16 in a use position. The second leg assembly 14 includes hinged supports 18a and 18b, which are pivotally connected to legs 22a and 22b, respectively, and pivotally connected to a first end of a central support bracket 40b to hold the second leg assembly 14 in a use position. The second ends of the central support brackets 40a and 40b are pivotally connected to a tubular cross bracket 38, which spans the width of the second tabletop portion 12b.

[0027] Using screws or other fasteners, the first side rails 30a, 32a and the second side rails 30b, 32b are preferably attached to the first desktop portion 12a and the second desktop portion 12b, respectively. The first side rail 30a is pivotally connected to the second side rail 30b via a hinge assembly 36. Figure 6As shown, hinge assembly 36 includes a first hinge portion 36a and a second hinge portion 36b, the first hinge portion 36a being fixed to a first side rail 30a, and the second hinge portion 36b being fixed to a second side rail 30b. Similarly, the first side rail 32a is pivotally connected to the second side rail 32b via hinge assembly 34. Hinge assembly 34 includes a first hinge portion 34a and a second hinge portion 34b, the first hinge portion 34a being fixed to the first side rail 32a, and the second hinge portion 34b being fixed to the second side rail 32b. When leg assemblies 14 and 16 are retracted to... Figure 3 , Figure 9 and Figure 10 When in the storage position shown, hinge assemblies 34 and 36 allow desktop portion 12a to pivot relative to desktop portion 12b along hinge axis 44.

[0028] The tubular cross bracket 38 is centered on the hinge axis 44 formed by the hinge assemblies 34-36, with one end attached to the hinge assembly 34 and the other end attached to the hinge assembly 36. In a preferred embodiment, the cross bracket 38 is a cylindrical tube with a circular cross-section. In some embodiments, these ends of the tubular cross bracket 38 are attached to the hinge assemblies 34 and 36 by welded joints. The tubular cross bracket 38 preferably includes holes through which fasteners pass to attach the tubular cross bracket 38 to a molded support 50 extending from the bottom surface of the second desktop portion 12b.

[0029] like Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, an elongated planar cross bracket 39 is attached to the bottom surface of the first desktop portion 12a to provide lateral support. The bracket 39 reinforces the inner edge 42a of the first desktop portion 12a independently of any connection to the inner edge 42b of the second desktop portion 12b. This eliminates the need for any interlocking features, such as those required in existing technical tables. Figure 11 ).

[0030] like Figure 8A and Figure 8B As shown, a preferred embodiment of the cross brace 39 includes a rectangular planar portion 60, each end of which has a tab 54 perpendicular to the planar portion 60. To enhance its rigidity, the central region of the brace 39 includes ribs 56 along its outer edge, also perpendicular to the rectangular planar portion 60. Multiple pairs of arcuate cutouts 52 are provided in the ribs 56 and located near the tabs 54 at each end of the cross brace 39. Figure 3 and Figure 7As shown, the cutout 52 accommodates the lower ends of the legs 24a-24b, thereby allowing the legs 24a-24b to lie flat against the bottom surface of the tabletop portion 12a when the leg assembly 16 is in the folded position.

[0031] like Figure 8B As shown, rib 56 and planar portion 60 form a channel 64 with a U-shaped cross-section, which provides greater rigidity to the cross bracket 39. Pairs of holes 58 are provided through which fasteners can pass to secure the bracket 39 to the bottom surface of the first tabletop portion 12a. The bracket 39 is preferably formed from a single piece of steel, wherein the tabs 54 and ribs 56 are integrally formed by bending.

[0032] like Figures 8C to 8D As shown, the bracket 39 has a width W and a length L1. Its central region has a length L2. The tab 54 has a height H1 and the rib has a height H2. All components of the bracket 39 preferably have the same thickness T. The holes 58 are spaced apart by a distance D and each has a radius R. In a preferred embodiment, W is 20 mm, L1 is 683.4 mm, L2 is 495 mm, H1 is 18 mm, H2 is 10 mm, D is 220 mm, T is 2.3 mm, and R is 6.5 mm. In another preferred embodiment, W is 20 mm, L1 is 643.5 mm, L2 is 483.5 mm, H1 is 18 mm, H2 is 10 mm, D is 250 mm, T is 2.3 mm, and R is 6.5 mm.

[0033] The tab 54 is secured to the first hinge portion 34a at one end of the bracket 39, and the tab 54 is secured to the first hinge portion 36a at the other end of the bracket 39. In a preferred embodiment, the tab 54 is attached to the hinge portions 34a-36a by welding. In another embodiment, attachment is performed using fasteners such as screws or rivets.

[0034] In a preferred embodiment, the desktop portion is formed of blow-molded plastic, while the side rails, leg assembly, central support bracket, tubular cross bracket, planar cross bracket, and hinge assembly are formed of steel. In another embodiment, the metal components may be formed of other materials, such as aluminum extrusions, and components formed of other materials may have a greater thickness compared to components formed of steel.

[0035] Using a planar cross brace with a U-shaped channel to reinforce the inner edge of the desktop portion 12a has several advantages over using a tubular cross brace, including: —Tests have shown that U-shaped steel channels are more robust than tubular steel supports; —U-shaped steel channels are less expensive than tubular steel supports; —U-shaped steel channels are lighter than tubular steel supports; —Because U-shaped steel channels are more robust than tubular steel supports, less plastic material is needed to form the tabletop, resulting in lower costs; and Attaching a flat support to the bottom surface of a desktop is less complicated than attaching a tubular support.

[0036] The foregoing description of preferred embodiments of the invention has been presented for purposes of illustration and description. These descriptions are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Based on the foregoing teachings, obvious modifications or variations are possible. The embodiments have been chosen and described to provide the best illustration of the principles of the invention and its practical application, and to enable those skilled in the art to utilize the invention in various embodiments and to utilize various modifications suitable for the particular purpose contemplated. All such modifications and variations fall within the scope of the invention as defined by the appended claims when interpreted according to the breadth to which they are fairly, legally, and justly enjoyed.

Claims

1. A foldable table with a use position and a storage position, the foldable table comprising: Desktop, the desktop comprising: A first desktop portion, formed of blow-molded plastic, has a top surface, a bottom surface, a first inner edge, and a first outer edge, the first outer edge being parallel to the first inner edge; and The second desktop portion is formed of blow-molded plastic and has a top surface, a bottom surface, a second inner edge, and a second outer edge, the second outer edge being parallel to the second inner edge; The first inner edge and the second inner edge are adjacent to each other when the table is in the use position, and are separated from each other when the table is in the storage position; A pair of opposing first side rails, the first side rails being attached to the bottom surface of the first desktop portion between the first inner edge and the first outer edge; A pair of opposing second side rails, the second side rails being attached to the bottom surface of the second desktop portion between the second inner edge and the second outer edge; A first leg assembly is pivotally connected between the first side rails to the bottom surface of the first desktop portion, the first leg assembly extending downward from the first desktop portion when the table is in the use position, and the first leg assembly being positioned adjacent to the first desktop portion when the table is in the storage position; A second leg assembly is pivotally connected between the second side rails to the bottom surface of the second desktop portion, the second leg assembly extending downward from the second desktop portion when the table is in the use position, and the second leg assembly being positioned adjacent to the second desktop portion when the table is in the storage position; A pair of opposing hinge assemblies are disposed on a hinge axis parallel to the second inner edge of the second desktop portion. Each hinge assembly includes a first hinge portion and a second hinge portion rotatably attached to each other, wherein the first hinge portion of each hinge assembly is attached to one of the first side rails, and the second hinge portion of each hinge assembly is attached to one of the second side rails, thereby enabling the first desktop portion and the second desktop portion to pivot relative to each other about the hinge axis. A tubular cross bracket, which is disposed on the hinge axis between the pair of hinge assemblies and fixed to the bottom surface of the second desktop portion; A first central support bracket has a first end and a second end, the first end being pivotally attached to the first leg assembly and the second end being pivotally attached to the tubular cross bracket. A second central support bracket, having a first end and a second end, the first end being pivotally attached to the second leg assembly, and the second end being pivotally attached to the tubular cross bracket; and A planar cross bracket, the planar cross bracket being fixed to the bottom surface of the first desktop portion and configured adjacent to and parallel to the first inner edge of the first desktop portion, wherein the planar cross bracket includes a pair of opposing tabs disposed at opposite ends thereof, each tab being fixed to the first hinge portion of a corresponding one of the pair of hinge assemblies; the planar cross bracket includes a pair of opposing ribs disposed along the outer edge of a central channel portion of the planar cross bracket, wherein the ribs are configured parallel to the first inner edge of the first desktop portion and extend from the planar cross bracket in a direction perpendicular to the bottom surface of the first desktop portion to form a U-shaped cross section within the central channel portion of the planar cross bracket.

2. The folding table of claim 1, wherein the tubular cross bracket includes opposing ends, the opposing ends being fixed to the opposing hinge assembly.

3. The folding table of claim 1, wherein each hinge assembly includes a first hinge portion and a second hinge portion rotatably attached to each other, wherein the first hinge portion of each hinge assembly is attached to one of the first side rails, and the second hinge portion of each hinge assembly is attached to one of the second side rails.

4. The folding table of claim 3, wherein the planar cross bracket includes a pair of opposing tabs disposed at opposite ends of the planar cross bracket, each tab extending from the planar cross bracket in a direction perpendicular to the bottom surface of the first tabletop portion, wherein each tab is fixed to a corresponding one of the first hinge portions.

5. The folding table of claim 4, wherein each tab is welded to the corresponding one of the first hinge portions.

6. The foldable table according to claim 1, wherein the planar cross bracket includes a plurality of holes disposed in the central channel portion, and fasteners pass through the holes to secure the planar cross bracket to the bottom surface of the first desktop portion.

7. The foldable table of claim 1, wherein the tubular cross bracket includes a plurality of holes through which fasteners pass to secure the tubular cross bracket to the bottom surface of the second desktop portion.

8. The folding table according to claim 1, wherein the planar cross support comprises: An elongated rectangular planar portion having elongated opposing side edges and narrow opposing end edges, the opposing end edges being perpendicular to the side edges; A pair of opposing tabs, the pair of opposing tabs including one of the tabs extending from the opposing end edges in a direction perpendicular to the rectangular planar portion; A pair of opposing ribs are disposed along the opposing side edges in the central region of the rectangular planar portion, wherein the ribs are parallel to the opposing side edges and extend from the rectangular planar portion in a direction perpendicular to the rectangular planar portion, thereby forming a central channel with a U-shaped cross-section. and Multiple pairs of opposing arcuate cuts in the opposing ribs, the cuts being configured to be adjacent to a corresponding tab at one of the opposing end edges, the cuts being used to receive opposing legs of the first leg assembly, thereby allowing the first leg assembly to lie flat against the bottom surface of the first tabletop portion when the first leg assembly is in a folded position.

9. The foldable table according to claim 1, wherein the first inner edge and the second inner edge of the first desktop portion and the second desktop portion are linear and parallel to the hinge axis.

10. The folding table of claim 1, wherein the first leg assembly is pivotally connected to the first side rail and the second leg assembly is pivotally connected to the second side rail.

11. The folding table according to claim 1, wherein: The planar cross bracket is disposed between the first inner edge and the first outer edge of the first desktop portion; and The tubular cross bracket is disposed between the second inner edge and the second outer edge of the second desktop portion.

12. A cross bracket for reinforcing the tabletop of a folding table, the cross bracket comprising: An elongated rectangular planar portion having elongated opposing side edges and narrow opposing end edges, the opposing end edges being perpendicular to the side edges; A pair of opposing tabs, the tabs extending from the opposing end edges in a direction perpendicular to the rectangular planar portion; and A pair of opposing ribs extending from the opposing side edges in a direction perpendicular to the rectangular planar portion, thereby forming an elongated channel with a U-shaped cross-section.

13. The cross bracket of claim 12, further comprising a plurality of holes disposed in the rectangular planar portion, the holes being operable to receive fasteners for securing the cross bracket to the desktop.

14. The cross brace according to claim 12, further comprising a plurality of pairs of opposing arcuate cuts in the opposing ribs, each pair of opposing cuts being configured to be adjacent to one of the corresponding tabs.

15. A foldable table with a use position and a storage position, the foldable table comprising: Desktop, the desktop comprising: A first desktop portion, the first desktop portion having a top surface, a bottom surface, a first inner edge, and a first outer edge, the first outer edge being parallel to the first inner edge; and The second desktop portion has a top surface, a bottom surface, a second inner edge, and a second outer edge, the second outer edge being parallel to the second inner edge; The first inner edge and the second inner edge are adjacent to each other when the table is in the use position, and are separated from each other when the table is in the storage position; A pair of opposing first side rails, the first side rails being attached to the bottom surface of the first desktop portion between the first inner edge and the first outer edge; A pair of opposing second side rails, the second side rails being attached to the bottom surface of the second desktop portion between the second inner edge and the second outer edge; A first leg assembly is pivotally connected between the first side rails to the bottom surface of the first desktop portion, the first leg assembly extending downward from the first desktop portion when the table is in the use position, and the first leg assembly being positioned adjacent to the first desktop portion when the table is in the storage position; A second leg assembly is pivotally connected between the second side rails to the bottom surface of the second desktop portion, the second leg assembly extending downward from the second desktop portion when the table is in the use position, and the second leg assembly being positioned adjacent to the second desktop portion when the table is in the storage position; A pair of opposing hinge assemblies are disposed on a hinge axis parallel to the second inner edge of the second desktop portion. Each hinge assembly includes a first hinge portion and a second hinge portion rotatably attached to each other, wherein the first hinge portion of each hinge assembly is attached to one of the first side rails, and the second hinge portion of each hinge assembly is attached to one of the second side rails, thereby enabling the first desktop portion and the second desktop portion to pivot relative to each other about the hinge axis. A tubular cross bracket, the tubular cross bracket being disposed on the hinge axis between the hinge assembly pairs and fixed to the bottom surface of the second desktop portion, wherein the tubular cross bracket includes opposite ends fixed to the opposite hinge assemblies; A first central support bracket has a first end and a second end, the first end being pivotally attached to the first leg assembly and the second end being pivotally attached to the tubular cross bracket. A second central support bracket, having a first end and a second end, the first end being pivotally attached to the second leg assembly, and the second end being pivotally attached to the tubular cross bracket; and A planar cross bracket, the planar cross bracket being fixed to the bottom surface of the first desktop portion and configured to be adjacent to and parallel to the first inner edge of the first desktop portion, the planar cross bracket comprising: A pair of opposing tabs, each tab being disposed at opposite ends of the planar cross bracket, each tab extending from the planar cross bracket in a direction perpendicular to the bottom surface of the first desktop portion, wherein each tab is fixed to a corresponding one of the first hinge portions; and A pair of opposing ribs are provided along the outer edge of the planar cross bracket, wherein the ribs are configured to be parallel to the first inner edge of the first desktop portion and extend from the planar cross bracket in a direction perpendicular to the bottom surface of the first desktop portion to form a central channel with a U-shaped cross section.

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