Patent ID: 7065928

Claim:
A roof curb, comprising: a plurality of exterior planar panels connected together to form a rectangular box, each of said panels having a top edge, a bottom edge, an interior surface, an exterior surface, and first and second ends, and defining an elongated direction extending from said first end to said second end; said plurality of exterior planar panels including first and second adjacent exterior planar panels; said first adjacent exterior panel having a bent portion at its first end at right angles to its elongated direction; one of said bent portion and said second panel defining a tab having a first end secured to its respective panel and a second end that is free, said tab also including a projection extending parallel to the elongated direction of said first adjacent exterior planar panel; the other of said bent portion and said second adjacent exterior planar panel defining a strap having first and second ends secured to the respective panel and an intermediate portion offset from its respective panel, said intermediate portion defining first and second edges and an opening sized to receive the projection of said tab; wherein said first and second adjacent exterior planar panels are assembled together by aligning the tab with the strap and sliding the free end of the tab into the offset intermediate portion of said strap until the projection from said tab is received in the opening in said strap, wherein the receipt of said projection in the opening of said strap limits the movement of said projection relative to said strap upwardly, downwardly, and in the longitudinal direction, thereby locking together said first and second adjacent exterior planar panels and forming a corner of said rectangular box.