F - Mech Eng,Light,Heat,Weapons – 41 – B
Patent
F - Mech Eng,Light,Heat,Weapons
41
B
124/8
F41B 5/00 (2006.01)
Patent
CA 1287280
Abstract of the Disclosure: A bow limb which is totally molded essentially filled with unbroken longitudinal strands of fiberglass oriented in the central configuration in parallel strands, but as approaching the exterior of the bow, the strands conform to the exterior configuration of the limb. The bow limb is also characterized by a substantially constant cross-section even though width and thickness may vary longitudinally. This maintains a constant ratio of resin to fiberglass which is important to insure uniform strength characteristics. If the concentration of resin to fiberglass becomes too great, a brittle or weak point which invites breakage can occur. If the fiberglass to resin ratio is too great, inadequate bonding can result in bending failure. The method comprises the steps of wrapping impregnated fiberglass strands around a frame to create a fiberglass and resin blank or package. The wet blank or package is then placed in the mold to be shaped and cured. The package has a calculated predetermined number of fiberglass strands, and also a calculated predetermined volume and weight of plastic resin. The mold, has two parts, a male and female. The volume of the mold may be simultaneously thinned and widened in forming the mold in such a manner that the cross-section is constant at any given point. The thickness of the limb can be varried in accordance with the depth of penetration of the male member of the mold into the female. A tail of the excess fiberglass and resin extends from both ends of the mold, and after the formed unit or paddle is first cured and then removed from the mold; these are removed with a saw cut. The paddle is removed from the mold as soon as cured to the handling point, and then finish cured in an oven. When totally cured the paddle is severed into two limbs.
520665
Johnson Douglas S. Q.c.
Precision Shooting Equipment Company
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