Non-seating plate/fastener assembly

Abstract

An improved plate/fastener assembly includes an elongated fastener having a first set of threads adjacent the tip and a second set of threads adjacent the head. The first set of threads has a diameter smaller than that of the second. The fastener is employed with a plate which includes a stress plate portion having a hub extending downwardly therefrom. The hub includes an opening extending therethrough which receives the fastener. The first set of threads will engage with a metal roof deck to hold the fastener in place, while the second set of threads engages with the plate to hold the plate in place. The lower face of the plate includes a plurality of ribs adapted to engage with an insulation material to prevent rotation of the plate. Each of the ribs presents a concave configuration in the direction of rotation of the plate to disengage same from the fastener. The ridges have a triangular cross-section, with a first face which will oppose this loosening rotation of the plate forming a smaller angle with respect to the bottom face of the plate than does the other face. The plate may also include a plurality of circumferentially spaced hub ribs which extend in the longitudinal direction of the hub on its outer face. These hub ribs also serve to resist rotation of the plate.

Dependencies are inferred from the claim text.