Shafts with reinforcing layer for sporting goods and methods of manufacture
Reinforcement is used in the manufacture of shafts having multiple layers with multiple types of material in various combinations for the arrows, crossbow bolts, and sporting goods of the present invention. The reinforced shaft is a cylindrical tube made of a base material with a reinforcing layer applied to the cylindrical tube. In one embodiment, the reinforced shaft is a carbon fiber blank with a steel mesh used as the reinforcing layer. The reinforcing layer applied over the carbon fiber blank increases the overall strength of the shaft.
1. A reinforced arrow shaft for an archery arrow or a crossbow bolt, the arrow shaft formed from materials consisting essentially of a carbon fiber blank, a sheet of metal mesh, and a glass scrim material, and prepared by a method comprising:
wrapping a carbon fiber material pre-impregnated with a resin round a mandrel to form a carbon fiber blank, wherein the carbon fiber blank consists of a cylindrical tube having a longitudinal axis; an inside diameter spanning the longitudinal axis; and an outside diameter spanning the longitudinal axis;
rolling a sheet of metal mesh around the carbon fiber blank to form at least one reinforcing layer having a length substantially equal to the length of the cylindrical tube and a width substantially equal to the circumference of the cylindrical tube;
rolling a glass scrim material around the carbon blank having the reinforcing layer;
curing the carbon fiber blank having the reinforcing layer and the glass scrim material under pressure;
removing the mandrel from inside the arrow shaft; and
grinding the glass scrim material to provide the arrow shaft with a predetermined static spine and exterior diameter, the static spine defining the stiffness of the arrow shaft and its resistance to bending,
wherein the diameter of the mandrel defines the interior diameter of the arrow shaft, and the amount of carbon fiber material wrapped around the mandrel in conjunction with the thickness of the reinforcing layer defines the exterior diameter of the arrow shaft, and
wherein the metal mesh has at least 80×80 wires per square inch and adds about 1.2 grains/inch to the arrow shaft's weight.
2. The arrow shaft of claim 1 wherein the sheet of metal mesh comprises at least one of aluminum, steel, stainless steel, brass, titanium, nickel, silver, and nitinol.
3. The arrow shaft of claim 1 wherein the sheet of metal mesh comprises wire having a diameter less than 0.0032 inches.
4. The arrow shaft of claim 1 wherein the sheet of metal mesh comprises wire having a diameter from 0.001 inches to 0.0032 inches.
5. The arrow shaft of claim 1 wherein the sheet of metal mesh comprises wire having a diameter from 0.001 inches to 0.002 inches.
6. The arrow shaft of claim 1 wherein the sheet of metal mesh is woven.
7. The arrow shaft of claim 1 wherein the sheet of metal mesh is knitted.
8. The arrow shaft of claim 1 wherein the sheet of metal mesh is an alloy.
9. The arrow shaft of claim 1 wherein the method further comprises wrapping a cellophane-like film around the finishing layer; performing the curing; and removing the cellophane-like film.
10. The arrow shaft of claim 1 wherein the method further comprises applying a contracting sleeve around the finishing layer; performing the curing; and removing the contracting sleeve.
11. The arrow shaft of claim 1 wherein the method further comprises performing the curing in a pressure vessel.