| CPC A47L 15/50 (2013.01) [A47L 15/501 (2013.01); A47L 15/502 (2013.01); A47L 15/505 (2013.01)] | 16 Claims |

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1. A rack assembly comprising:
a frame; and
a fixing rack coupleable to a top of the frame, and including
a housing forming an outer contour of the fixing rack,
a plurality of horizontal ribs forming a bottom surface of the housing, and each horizontal rib of the plurality of horizontal ribs is spaced apart from another horizontal rib of the plurality of horizontal ribs, and
a plurality of vertical ribs forming the bottom surface of the housing perpendicular to the plurality of horizontal ribs, and each vertical rib of the plurality of vertical ribs is spaced apart from another vertical rib of the plurality of vertical ribs, and
wherein the plurality of horizontal ribs include:
at least one curved region formed by a descending portion and a rising portion.
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