Adjustable pedestal for elevated floors

An elevated floor structure comprising:

• a plurality of individual pedestals supported on a generally horizontal subfloor and a plurality of panel members, said pedestals being disposed in a uniform geometric pattern over said subfloor, each of said pedestals an upstanding support rod having an upper end, and a head assembly supported by said upper end, each said head assembly comprising a head member receiving said upper end and having a generally flat upper surface which is adjustable vertically, rotationally and laterally of said upper end, abutment means adjustable along said upper end and engageable by said head member, establishing a position of said head member wherein said upper surface resides in a horizontal plane vertically spaced from said subfloor, and clamping means clamping said head member to said upper end;
• each said head member including radially extending lugs extending above said upper surface, each of said lugs being aligned with a similar lug of an adjacent one of said pedestals, whereby an adajcent pair of said lugs of one pedestal cooperates with adjacent pairs of said lugs from adjacent pedestals to define a panel member supporting surface which is horizontal and coincides with said horizontal plane.