Composite high strength to weight structure having shell and sle

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

1976-07-07

1978-01-24

Apley, Richard J.

Amusement devices: games

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

Target

273DIG23, 264 453, 428377, A63B 4910

Patent

active

040700216

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, with a seamless sleeve made of a thin, flexible cellulosic film between the core and the shell.
The structural member is prepared by arranging within a mold cavity an outer shell comprising at least one sheet of resin-coated unidirectionally oriented graphite fibers and a core comprising a foamable resin composition while the core is maintained within a seamless sleeve made of a thin, flexible cellulosic film, 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.

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