主权项 |
1. A component of a flooring system comprising a tray substrate having:
a tray substrate surface which is an upward facing horizontal surface having a tray substrate surface perimeter, a tray substrate bottom, a plurality of vertical tray edges which protrude upward and extend along the tray substrate surface perimeter, a plurality of tray substrate edges defining an outside perimeter of the tray substrate,
the tray substrate edges having a plurality of upward tabs comprising a convex surface and a valley;the tray substrate edges further comprising a plurality of downward tabs comprising a concave surface and a lip, wherein at least a portion of the downward tabs is recessed under the upward facing horizontal tray surface, and wherein at least a portion of the lip of the downward tabs is directly beneath the tray substrate surface perimeter. |