Method of producing an annular foam product

Details Method of producing an annular foam product Method of producing an annular foam product

1988-05-20

1990-03-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264 467, 264 469, B29C 6722

Patent

active

049081705

ABSTRACT:
A method of producing an annular foam product having a foam filler covered by a tubular skin. A core embedded in the filler includes a connecting portion and a U-shaped portion which form an annular frame. Opposite edges of each of at least one skin member are joined together to form a U-shaped skin tube surrounding the U-shaped portion, such that the joined edges are located inside of the U-shaped skin tube. A skin sheet is jointed at opposite ends to corresponding opposite ends of the U-shaped skin tube so as to surround the connecting portion, while the end portions of the skin sheet are turned outside in. The end portions of the skin sheet are then turned over to expose its nominal outside outwardly, and opposite edges of the skin sheet along the connecting portion are joined together to form a connecting skin tube which surrounds the connecting portion of the annular frame. The U-shaped skin tube and the connecting skin tube constitute the tubular skin which encloses the annular frame. A foamable material is injected into the cavity formed between the tubular skin and the annular frame.

REFERENCES:
patent: 3389519 (1968-06-01), Williams et al.
patent: 3971112 (1976-07-01), Amato et al.

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