Glass fiber tennis racket frame

A racket frame of the character described comprising:

• a. an elongated hollow tubular member having the central portion thereof curved to define the generally oval head portion of said frame and having the end portions thereof extending in close parallel relation from said head portion to define the handle portion of said frame,
• b. the wall of said tubular member consisting essentially of a plurality of contiguous concentric annular layers of high tensile strength fibers impregnated and bonded together in tension by binder resin,
• c. each of said layers consisting of unidirectional essentially continuous fibers as distinguished from woven or braided fiber layers,
• d. the innermost and the outermost of said layers each being a helical winding of predetermined unidirectional hand with respect to the longitudinal axis of said tubular member and extending substantially the full length of said tubular member,
• e. at least one intermediate one of said layers also being a helical winding of unidirectional hand extending substantially the full length of said tubular member,
• f. another intermediate one of said layers extending lengthwise of said tubular member substantially the full length thereof,
• g. at least one additional intermediate one of said layers being a helical winding of unidirectional hand extending along only said head-defining portion of said tubular member,
• h. adjacent said helically wound layers being of opposite unidirectional hands, and
• i. means cooperating with said end portions of said tubular member to form the handle of said frame.