A solar panel rack may comprise a vertical support, a transverse support, brackets attaching hollow beams to the transverse support, and brackets configured to attach solar panels or solar panel assemblies to the hollow beams. Internal splices may couple collinearly arranged hollow beams in the sola
A solar panel rack may comprise a vertical support, a transverse support, brackets attaching hollow beams to the transverse support, and brackets configured to attach solar panels or solar panel assemblies to the hollow beams. Internal splices may couple collinearly arranged hollow beams in the solar panel rack. Some or all of these components may be formed from folded sheet metal blanks comprising bend lines predefined by bend-inducing features formed in the blanks. Preformed slots, holes, or other openings in the sheet metal blanks may predefine the relative positions of various components in the solar panel rack and predefine the positions of solar panels or solar panel assemblies to be supported by the solar panel rack. Individual components of the solar panel rack may be useful in other structures and applications apart from solar panel racks.
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1. A solar panel rack comprising: at least first and second hollow sheet metal beams arranged side by side and in parallel with each other to define a plane, each hollow sheet metal beam having a closed configuration of side walls along its longitudinal axis defining a hollow cross-section perpendic
1. A solar panel rack comprising: at least first and second hollow sheet metal beams arranged side by side and in parallel with each other to define a plane, each hollow sheet metal beam having a closed configuration of side walls along its longitudinal axis defining a hollow cross-section perpendicular to its longitudinal axis;a transverse support comprising two or more notches located in its upper edge;two or more first sheet metal brackets, each first sheet metal bracket having an outer cross-sectional shape substantially conforming to an inner cross-sectional shape of a corresponding notch in the transverse support, having an inner cross-sectional shape substantially conforming to the outer-cross sectional shape of a corresponding hollow sheet metal beam, positioned in the corresponding notch in the transverse support, and attached to and supporting the corresponding hollow sheet metal beam at least partially within the corresponding notch in the transverse support, each first sheet metal bracket formed from a single sheet of metal and comprising upper flanges configured to be closed around the corresponding hollow sheet metal beam to capture the hollow sheet metal beam within the first sheet metal bracket;one or more second sheet metal brackets, each second sheet metal bracket having an inner cross-sectional shape substantially conforming to the outer cross-sectional shape of a corresponding hollow sheet metal beam, positioned on and attached to the corresponding hollow sheet metal beam, and configured to couple to a solar panel or solar panel assembly to position and attach the solar panel or solar panel assembly to the solar panel rack in a desired location in the plane defined by the hollow sheet metal beams;a third hollow sheet metal beam arranged collinearly with the first or the second hollow sheet metal beam and having a closed configuration of side walls along its longitudinal axis defining a hollow cross-section perpendicular to its longitudinal axis; andan expandable and collapsible hollow sheet metal beam having a closed configuration of side walls along its longitudinal axis defining a hollow cross-section perpendicular to its longitudinal axis, the expandable and collapsible hollow sheet metal beam configured to be bent along predefined bend lines to assume a collapsed configuration, inserted while in the collapsed configuration into adjoining ends of the collinear hollow sheet metal beams, expanded to a configuration having an outer cross-sectional shape conforming to and tightly fitting an internal cross-sectional shape of the collinear hollow sheet metal beams, then attached to both of the collinear hollow sheet metal beams to couple the collinear hollow sheet metal beams to each other. 2. The solar panel rack of claim 1, wherein: each hollow sheet metal beam is formed by bending a sheet metal blank along bend lines predefined in the sheet metal blank by bend-inducing features; andthe bend-inducing features each have a length A and each have a radius of curvature R at each end, where R is approximately a minimum radius of curvature required to prevent cracking at ends of the bend-inducing features upon bending of the blank along the bend lines, and A is less than or equal to about 6R. 3. The solar panel rack of claim 2, wherein A is greater than or equal to about 2R. 4. The solar panel rack of claim 1, wherein each hollow sheet metal beam is formed by bending a single sheet metal blank comprising preformed tabs and slots configured to secure the sheet metal blank in a beam configuration upon bending of the blank into the beam configuration. 5. The solar panel rack of claim 1, wherein each hollow sheet metal beam is formed from a single sheet of metal and comprises preformed slots or other openings configured to predefine the locations at which solar panels or solar panel assemblies are to be attached to the solar panel rack. 6. The solar panel rack of claim 1, wherein the transverse support is formed from a single sheet of metal and comprises flanges forming side walls for the notches, and the side walls of each notch are attached to opposite sides of a first sheet metal bracket positioned in the notch. 7. The solar panel rack of claim 6, wherein the transverse support comprises one or more preformed tabs or slots configured to engage one or more corresponding slots or tabs in the first sheet metal bracket to at least partially secure the first sheet metal bracket in position on the transverse support. 8. The solar panel rack of claim 1, wherein each first sheet metal bracket comprises one or more tabs or slots configured to engage one or more corresponding slots or tabs in the transverse support to at least partially secure the first sheet metal bracket in position on the transverse support. 9. The solar panel rack of claim 1, wherein each first sheet metal bracket extends beyond the transverse support in both directions along its corresponding hollow sheet metal beam. 10. The solar panel rack of claim 1, wherein each second sheet metal bracket is formed from a single sheet of metal and comprises one or more upwardly pointing tabs configured to contact features on a solar panel or solar panel assembly to position the solar panel or solar panel assembly in a desired location. 11. The solar panel rack of claim 10, wherein the one or more upwardly pointing tabs on each second sheet metal bracket configured to contact features on a solar panel or solar panel assembly to position the solar panel or solar panel assembly in a desired location are located in a square or rectangular arrangement in a central portion of a top panel of the second sheet metal bracket and extend upward from the top panel. 12. The solar panel rack of claim 1, wherein each second sheet metal bracket is configured to position and attach adjacent corners of four solar panels or solar panel assemblies to the solar panel rack. 13. The solar panel rack of claim 1, wherein each second sheet metal bracket is formed from a single sheet of metal and comprises one or more upwardly pointing clinching tabs configured to be clinched to features on a solar panel or solar panel assembly to attach the solar panel or solar panel assembly to the solar panel rack. 14. The solar panel rack of claim 13, wherein a pair of two clinching tabs are configured to be simultaneously clinched to attach two solar panels or solar panel assemblies to the solar panel rack. 15. The solar panel rack of claim 1, wherein: each hollow sheet metal beam is formed by bending a sheet metal blank comprising preformed tabs and slots configured to secure the sheet metal blank in a beam configuration upon bending of the blank into the beam configuration and comprising preformed slots or other openings configured to predefine the locations at which solar panels or solar panel assemblies are to be attached to the solar panel rack;each first sheet metal bracket extends beyond the transverse support in both directions along its corresponding hollow sheet metal beam; andeach second sheet metal bracket is formed from a single sheet of metal and comprises one or more upwardly pointing tabs configured to contact features on a solar panel or solar panel assembly to position the solar panel or solar panel assembly in a desired location and one or more upwardly pointing tabs configured to be clinched to features on a solar panel or solar panel assembly to attach the solar panel or solar panel assembly to the solar panel rack. 16. The solar panel rack of claim 15, wherein the one or more upwardly pointing tabs on each second sheet metal bracket configured to contact features on a solar panel or solar panel assembly to position the solar panel or solar panel assembly in a desired location are located in a square or rectangular arrangement in a central portion of a top panel of the second sheet metal bracket and extend upward from the top panel. 17. The solar panel rack of claim 15, wherein each second sheet metal bracket is configured to position and attach adjacent corners of four solar panels or solar panel assemblies to the solar panel rack.
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