초록 ▼

A corrosion-resistant door constituted by a one-piece integrated structure of high strength, free of assembly joints and seams. The door includes a rectangular core formed by a slab of rigid closed-cell foam plastic or other material having an array of holes therein extending between the opposing fa

A corrosion-resistant door constituted by a one-piece integrated structure of high strength, free of assembly joints and seams. The door includes a rectangular core formed by a slab of rigid closed-cell foam plastic or other material having an array of holes therein extending between the opposing faces of the slab. The core is encapsulated within a rigid plastic shell formed by resin-impregnated fiberglass having a smooth, non-porous resin outer skin. The structure is reinforced by resin dowels which extend through the holes in the core to bridge the opposing faces of the shell. The door is fabricated by a resin transfer molding technique in which a core wrapped in dry fiberglass or other reinforcing material is placed in the mold and a liquid catalyzed resin is injected therein, which then cures to define the shell.

대표청구항 ▼

A door constituted by a onepiece integrated structure of high strength free of assembly joints and seams, the door comprising: A a rectangular slab-shaped core of rigid foam plastic material having a rectangular array of holes therein which extend between opposing faces of the core and are distribut

A door constituted by a onepiece integrated structure of high strength free of assembly joints and seams, the door comprising: A a rectangular slab-shaped core of rigid foam plastic material having a rectangular array of holes therein which extend between opposing faces of the core and are distributed in the transverse and longitudinal directions; B a rectangular plastic shell encapsulating said core and including opposing faces, said shell being formed by polyester resin-impregnated reinforcing fibers; and C polyester resin dowels extending through the holes in the core to bridge the opposing faces of the shell to reinforce the structure of the door.