Abstract: Two small diameter fiberglass tubes are rolled on silicone rubber slugs and inserted into a larger cylinder which is then pinched into a figure-8 shape. This is put in the curing mold. When heated the silicone rubber expands to push the fiberglass into contact with mold surfaces. After cooling the slugs can be pulled lengthwise, which reduces their diameter so they are self freeing from within the cured frame.

Abstract: A one-piece molded tennis racket or similar article constructed of resin-impregnated fabric consisting essentially of a plurality of substantially continuous fibers some of which extend from the butt of the handle, around the head frame and back down the handle, and other continuous fibers which extend just around the head frame. In one embodiment of the invention, the unique laminating technique provides a hollow tubular handle. In another embodiment of the invention, a flat handle is formed consisting of a pair of hollow-rectangular channels. The principal advantage of the racket in its finished form is that it has a high-strength-to-weight ratio.

Abstract: The vaulting pole has at least three layers, two of the layers comprising fiberglass tape helically wound along the pole into a succession of butt-jointed turns with the fibers thereof extending primarily lengthwise of the tape but the turns of the two layers being crossed with respect to each other, and the third layer comprising a plurality of turns of fiberglass cloth sandwiched between the two tape layers, the fibers of the cloth extending primarily lengthwise of the pole.