Composite high strength to weight structure having shell and wei

Details Composite high strength to weight structure having shell and wei Composite high strength to weight structure having shell and wei

1978-07-10

1980-07-15

Apley, Richard J.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

A63B 4910

Patent

active

042124611

ABSTRACT:
A novel structural member, such as a tennis racket frame, having an unusually high strength to weight ratio is provided comprising an expanded foamed plastic core integrally bonded to a shell comprising at least one layer of resin-coated unidirectionally oriented graphite fibers, the shell completely encasing the core at any transverse cross section of the structural member, said core comprising from about 25 to about 75 volume percent of a low density cellular filler material, such as chopped cork, and from zero to about 60 weight percent of a high density weight control material, such as barium sulfate.
The structural member is prepared by preparing a foamable resin composition comprising a resin component, a blowing agent, from about 7 to about 50 weight percent of a low density cellular filler material and from zero to about 60 weight percent of a high density weight control material, forming said composition into an elongated core strip, wrapping said core strip with at least one sheet of resin-coated unidirectionally oriented graphite fibers, arranging said wrapped core within a mold cavity, sealing the mold cavity and activating the foamable resin composition to cause expansion and generate pressure within the mold cavity and thereby provide intimate bonding of the core to the shell.

REFERENCES:
patent: 2583198 (1952-01-01), Axton
patent: 3206201 (1965-09-01), Hendricks
patent: 3644168 (1972-02-01), Bonk et al.
patent: 3856614 (1974-12-01), Susuki et al.
patent: 4061520 (1977-12-01), Cecka et al.
"Handbook of Reinforced Plastics"; 1964, pp. 194-196, 216, 217.

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