Patent ID: 11873613
Assignee: HUBBELL INCORPORATED
Field: Surface technology, coating (Chemistry)
Classification: CPC E  B  Y | IPC B  E

Claim 0:
1. A vault cover comprising:
a bottom reinforcement layer extending, at least partially along a first horizontal plane;
at least one edge reinforcement layer, a middle portion of the edge reinforcement layer disposed proximate to an edge of the vault cover, wherein a first fold connects a first portion of the edge reinforcement layer with the middle portion and wherein a second fold connects a second portion of the edge reinforcement layer with the middle portion;
a core, wherein the core comprises balsa wood, wherein the bottom reinforcing layer extends along a first major surface of the core and terminates within edges of the first major surface;
a top reinforcement layer extending, at least partially along a second horizontal plane substantially parallel with the first horizontal plane, wherein the top reinforcing layer extends along a second major surface of the core and terminates within edges of the second major surface, and wherein the core is positioned between the bottom reinforcement layer and the top reinforcement layer; and
a polymer resin matrix, wherein the polymer resin matrix comprises a polymer resin and a filler, wherein the filler comprises expanded glass beads, and wherein the polymer resin matrix comprises about 20% to about 80% by weight of expanded glass beads,, wherein an edge portion of the top reinforcement layer is positioned adjacent to the core, wherein the first portion of the edge reinforcement layer overlaps the edge portion of the top reinforcement layer on a side of the edge portion of the top reinforcement layer opposite from the core, wherein the second portion of the edge reinforcement layer extends from the middle portion inward from the edge of the vault cover along the first horizontal plane and wherein an edge portion of the bottom reinforcement layer is positioned adjacent to the core, wherein the second portion of the edge reinforcement layer overlaps the edge portion of the bottom reinforcement layer on a side of the edge portion of the bottom reinforcement layer opposite from the core, wherein the edge reinforcement layer is continuous from the first portion, through the middle portion to the second portion.