Patent ID: 7478506

Claim:
An adaptor for mounting rectangular ceiling panels on a suspended ceiling grid of inverted tee shaped grid members with generally horizontal flanges and vertical webs, the adaptor having gripping elements engaging upper surfaces of the grid tee flanges and panel support elements disposed below the gripping elements carrying the ceiling panels, the panel support elements engaging re-entrant surface portions on peripheral upstanding flanges of the ceiling panels and thereby transfer the weight of the panels through the adaptor to the suspended grid, the adaptor having four sections, each section having a cantilevered gripping element, each gripping element being spaced relative to the other gripping elements in a cruciform pattern, the gripping elements lying in a common horizontal plane and arranged to grip a separate one of four grid sections forming an intersection, the gripping elements all being cantilevered in the same direction in an angular sense about a center of the adaptor, said gripping elements being arranged to slip horizontally over a respective grid section when the adaptor, positioned from below the grid in an intermediate assembly position with the common horizontal plane of the gripping elements above a plane of the grid flanges, is rotated about a vertical axis coincident with a center of an intersection of grid sections, the gripping elements being cantilevered a distance substantially equal to the horizontal width of a grid flange from its web, the adaptor being devoid of structure, including any gripping element opposing each of said first mentioned gripping elements which could overlie the grid flange to the degree that said first mentioned gripping elements overlie the grid flange, in said common horizontal plane apart from said gripping elements which would prevent easy positioning of said adaptor in said intermediate assembly position, one set of the gripping elements being engaged with two grid sections lying along a common straight line and another set of gripping elements being engaged with two grid sections lying along a common straight line perpendicular to said first mentioned straight line, the panel support elements being arranged in oppositely facing pairs, two of said support element pairs straddling a line parallel to and directly vertically underlying said first mentioned straight line and another two of said support element pairs straddling a line parallel to and directly vertically underlying said perpendicular line.