A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
273/163
A63B 49/00 (2006.01) A63B 49/02 (2006.01) A63B 49/04 (2006.01) A63B 49/08 (2006.01) A63B 49/10 (2006.01) B29C 70/46 (2006.01) B29C 70/56 (2006.01)
Patent
CA 1231990
ADJUSTABLE RACKET FRAME AND THE PRODUCTION METHOD ABSTRACT OF THE DISCLOSURE The basic racket frame is comprised of an oval head, a yoke merging into a throat and a solid or a hollow shaft which is formed from a single length of collimated filaments preferably graphite fibers, known as a roving impregnated with a thermosetting resin. This roving is prewound onto a separable spool, transferred into a compression type of mold where it is subjected to a sustained balanced maximum tension and cured under heat and pressure. Alternatively, the roving is directly machine wound onto a machine-rotated combination mandrel mold device. The single length of roving is first wound into a first loop portion on the mandrel-mold defining the oval-shaped head portion. Rota- tion is stopped and a permanent cellular core encased by a resin impregnated fiber fabric together with a removable core rod are placed securely within the mandrel-mold. A pin is fixed in the mold spaced from the head portion. Winding is continued using the same length of fiber roving to form more elongated turns about the pin and further encompassing the head and the core materials. When the winding is completed, the finishing end is securely knotted to the starting end at the pin location to define a dual-portioned solidly closed loop which is tensioned throughout to a maximum degree. 22
470782
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