B - Operations – Transporting – 60 – B
Patent
B - Operations, Transporting
60
B
18/1131, 301/73
B60B 5/00 (2006.01) B29C 43/56 (2006.01) B60B 1/00 (2006.01) B60B 5/02 (2006.01)
Patent
CA 2000652
21 HOLLOW SHELL FIBER REINFORCED RESIN IMPREGNATED BICYCLE WHEEL CONSTRUCTION AND METHOD THEREFOR ABSTRACT OF THE DISCLOSURE A bicycle wheel is disclosed having no more than five airfoil shaped spokes linking a central hub to a peripheral rim in a blown and hollow fiber reinforced construction with resulting improvements of wheel spoke windage, overall wheel weight and rim inertia. A heated two-part hollow mold is utilized to form and cure the bicycle wheel, the parts of the mold coming together to form a hollow concavity having an interior dimension complementary to the finished exterior dimension of the finely fabricated bicycle wheel. The bicycle wheel includes a central hub and preferably three or four radially extending spokes. The radially extending spokes all have airfoil shapes, the leading and trailing edges of the airfoil shapes extending in the plane of wheel rotation to reduce spoke windage. Adjacent spokes extend from the central hub and with the central hub form a spoke arch with each spoke forming one end of the spoke arch and the hub forming a central portion of the spoke arch. The distal ends of this spoke arch form the base support points for segments of the rim extending between the spokes. The segments of the rim extending between the spokes form an opposed rim arch to the spoke arch between the spoke ends. This opposed rim arch of each rim segment includes a central portion reinforced for the resistance of high tension and compression in the middle of each rim arch and is joined to the spokes at the end of each rim arch so that the central spoke arch and the peripheral rim arch oppose one another at each arch base. All rim segments together between all spokes define a conventional exteriorly open U-shaped pneumatic tire holding slot of conventional circular dimension. At one of the rim arches, a point of arch stress reversal is chosen for the placement of the necessary singular pneumatic tire valve. The process of construction includes laying up resin impregnated fiber on the 22 mold surfaces. placing a central bladder, closing the mold so as to trap the bladder between the resin impregnated fibers, inflating the bladder to expand the fibers to the outer surface concavity of the mold, and curing the finally constructed hollow bicycle wheel against the mold periphery.
Fetherstonhaugh & Co.
Hamilton-Sattui
Lewis Ralph H.
LandOfFree
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