Interconnecting means for modular closed louver panel system

Claim 1

A construction planar panel interlockable with a plurality of substantially identical panels to form a planar panel system, comprising: a continuous planar backing sheet having at least two edges in a first plane; a plurality of first cells in a fixed pattern having peripheral closed walls and opposed ends, said first cells extending generally perpendicularly from said backing sheet intermediate said edges and in a second plane, with said backing sheet completely closing one end of each of said first cells; a plurality of second cells having opposed open ends, substantially identical in shape to, in the same pattern as and parallel to said first cells being along one of said backing sheet edges, and said second cells extending laterally beyond said backing sheet one edge in said second plane; said backing sheet having a plurality of planar extensions forming the other of said backing sheet edges and extending beyond said first cells generally as far as said second cells extend beyond said first edge in the direction of said plane, and said planar extensions conforming to the pattern to completely overlie and close the corresponding one end of the second cells of a second substantially identical panel; all of said first and second cells and said backing sheet being integrally connected together; a plurality of flange means generally perpendicularly extending from said backing sheet planar extensions in the same plane as said cells and being shaped to engage the peripheral walls of the second cells of a second panel for positively preventing relative movement between said planar extensions and the second cells of the second panel in the plane of their backing sheets when the panels are assembled with their backing sheets coextensive and one edge of one backing sheet being immediately adjacent the other edge of the other backing sheet.