Editorial Note For 2010101155 There are 5 pages of description AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION INNOVATION PATENT RAPID ASSEMBLY RIGID FLAT-PACKED NINETEEN INCH EQUIPMENT OR SIMILAR CABINET The invention is described in the following statement 1 RAPID ASSEMBLY RIGID FLAT-PACKED NINETEEN INCH OR SIMILAR CABINET This invention relates to a cabinet which may be used to house 19" equipment, but may also be used in other cabinet configurations or applications. This invention has several unique innovations that are described in the following text. These innovations are; a unique frame consisting of a novel corner construction with welded frame ends which allow the use of snap-in fasteners, a frame transversal with an integrated mounting arm and, a mounting rail with a full length support brace. There are numerous construction methods used to manufacture cabinet frames. Fully 10 welded frames provide the greatest rigidity. The disadvantage of using a fully welded frame lies in the volume of the resulting product which is required to be stored and shipped as such. Other cabinet frames are built so that they can be assembled out of separate parts and fasteners at the installation location. These are widely referred to as 'flat-packed'. The advantage of this approach is that the cabinet frame is packaged unassembled and thus requires a lower volumetric space for storage and transport. Most flat-packed cabinet frames are assembled using traditional fasteners such as screws, bolts, tapped threads and other integrated fasteners such as pressed inserts or nutserts. The use of these fastening systems is time consuming in manufacture and in assembly. Additionally, the assembled product is distinctly less rigid in the three axes of movement (seen in Figure 1) than a fully 20 welded cabinet frame unless extra supports and braces are installed which compromise the usability of the cabinet and increase the direct cost of manufacture. Common problems encountered in previously mentioned cabinet frame constructions include; an inefficient use of space for shipping and storage for fully welded frames; a lack of rigidity and; time consuming methods of assembly in flat-packed units. It is the principal object of the present invention to provide a cabinet frame that is rigid in the three axes of movement as seen in Figure 1 while using a construction method that does not require a fully welded frame. This is achieved through the use of a novel corner construction that is described in Figure 2, Figure 4, Figure 5 and Figure 6. 1 This invention addresses the problems of rigidity, ease of assembly and the required volumetric space required for storage in cabinet frames with the use of a novel corner construction. A cabinet generally deforms in six ways. These are shown in Figure 1. The invention is a cabinet frame that is constructed from two frame ends and four frame transversals. A simplified representation of this can be seen in Figure 2. Figure 1 shows that the deformations D and E are resisted by having a stiff frame end construction. This is easily achieved using well established techniques in engineering. Deformations A, B , C and F are resisted entirely by the strength of the attachment of the frame transversal to the frame end. It is the method by which this is achieved that is defined as the novel corner 10 construction in this invention. Figure 3 and Figure 4 depict the snap-in fastener attachment features in both the frame end and the frame transversals, Each of the eight corners of the frame consists of a frame end and a frame transversal. The frame transversal is made from two pieces of formed and folded sheet metal that are welded together. A cross section of the frame transversal can be seen in Figure 9. At the end of the frame transversal is a feature through which a snap-in fastener is used to fix the frame transversal to the frame end. There is an additional feature on the top of the frame transversal that fixes the frame transversal in a second point to the frame end. These two features and how the separate parts are assembled can be seen in Figure 5. Snap-in fasteners are inserted through the two shaded sections of the frame 20 transversal. It is the result of the frame transversal construction and fixing method that the frame transversal becomes rigidly fixed to the frame end. Firstly the frame transversal is rigid in the direction of positive rotation in the X-plane. This is because the fixing at the front of the frame end acts as a pivot point and the frame transversal makes contact with the top edge thus no movement is possible. This contact edge is depicted with an arrow in Figure 6. The frame transversal is also fixed rigidly so that there is no rotational movement in the negative direction in the Y-plane due to contact along the side edge. This contact edge is depicted with an arrow in Figure 7. 9 While the frame transversal is not fixed rigidly in all directions to the frame end when used as a corner in isolation, when forming part of a frame, the kinematic relationships of the frame as a whole yield a stiff frame. Viewing each side of the frame as a rectangle, it is evident by analysing the kinematic relationship that the frame is always stiff because it always requires two of the four frame corners to deform in the direction that it is most stiff. A summary of how these frame corners combine to create a rigid frame is shown in Figure 8. As such this invention of a cabinet frame results in a rigid frame that is not fully-welded and thus can be flat packed to save in volumetric space when shipped and stored. In addition to the cabinet frame, side panels, doors, top and bottom covers and other accessories may 10 also be provided. Although this invention would primarily be used in situations where the final product is shipped flat packed, there are additional advantages that make it more economical to produce than a fully welded frame. Notably the use of smaller pieces of material means that the yield from a sheet improves when compared to frames made from fewer larger pieces of material. As an added advantage to the frame transversal construction, a mounting arm becomes available without any extra material or parts. Most cabinets that are used to mount nineteen inch equipment have a mounting arm that runs in the direction along the length of the cabinet to allow vertical mounting rails to be placed at different locations. Generally this 20 is a separate part of the frame construction. An additional benefit of the invention presented allows a mounting arm to integrate into the frame transversal as seen in Figure 9. There are numerous methods of constructing a nineteen inch equipment mounting rail however many suffer from a lack of stiffness resulting in twisting along the length of the rail. This is often countered through the use of a horizontal brace that is used to provide additional resistance to twisting along the axis of the length of the rail. The horizontal braces are a hindrance when installing and maintaining equipment. In addition to the cabinet frame described earlier in the text, a novel mounting rail design provides improved stiffness without the use of horizontal braces. This mounting rail is constructed from two piece of folded formed sheet metal that are welded together to create a hollow section. A 30 cross sectional representation of this can be seen in Figure 10. The hollow section that runs 10 the length of the mounting rail results in a mounting rail that resists twisting more effectively than a mounting rail that is made from a single piece of sheet metal. 11