Method for manufacturing ribbed archery bow limb portions and the ribbed archery bow limb portions produced thereby
View Patent ↗Typically a limb for an archery bow has a butt section or end attachable to a bow riser, a middle or hinge section and an opposing tip section or end. In a preferred embodiment, the present method and limb includes a rib section formed in the middle or hinge portion of the limb. This allows a narrowed front-profile to be presented in the hinge section, while maintaining the total cross-sectional area. In one preferred method, at least one half of a mold is formed to define a rib section in the hinge section of the limb. Preferably the rib section runs longitudinally along the length of the hinge section, and may include a tapered profile along the edges and ends of the rib.
1. An archery bow, comprising:
a. a riser portion with an upper end and a lower end;
b. a pair of bow limb members wherein each bow limb member is formed from fibers and resin, and has a longitudinal length, a butt section, a hinge section and a tip section;
c. wherein the butt section of one bow limb member is attached to said upper and lower ends of said riser respectively;
d. upper and lower rotational members mounted respectively to said tip sections of said upper and lower bow limb members;
e. a bowstring extending between said upper and lower rotational members; and,
f. a substantially longitudinal protruding rib portion defined in a face of the hinge section of each bow limb member.
2. The archery bow of claim 1 , wherein each bow limb member is formed with a substantially constant glass fiber to resin ratio in said butt section, said hinge section with said rib portion and said tip section.
3. The archery bow of claim 1 , wherein each said rib portion has a substantially elliptical profile.
4. The archery bow of claim 1 , wherein each said rib portion has a substantially rectangular profile.
5. An archery bow limb, comprising, a longitudinal bow limb member for an archery bow having a length, a butt section attachable to an archery bow riser, a hinge section and a tip section arranged to mount a rotational member, and a protruding rib portion wherein said rib portion protrudes from the front face of said limb.
6. The bow limb of claim 5 , wherein said rib portion is defined in said hinge section.
7. The bow limb of claim 6 , wherein said rib portion is substantially longitudinal.
8. The bow limb of claim 7 , wherein said rib portion is integrally formed with said limb.
9. The bow limb of claim 8 , wherein said rib portion has a substantially elliptical profile.
10. The bow limb of claim 8 , wherein said rib portion has a substantially rectangular profile.
11. The bow limb of claim 5 , wherein said rib portion has tapered edges from the rib portion into said limb.
12. The bow limb of claim 11 , wherein said rib portion is convex outward from said limb.
13. The bow limb of claim 12 , wherein said rib portion has a middle apex area.
14. The bow limb of claim 5 , wherein said limb defines front corner edges radiused along their length.
15. An archery bow limb, comprising, a bow limb member for an archery bow, having a longitudinal length, a butt section attachable to an archery bow riser, a hinge section and a tip section for supporting a rotational member; a protruding rib portion defined in said hinge section; and wherein said bow limb member is formed with a substantially constant cross-sectional area in said butt section, said hinge section and said tip section.
16. The archery bow limb of claim 15 , wherein said tip section is formed with a partial height area defining an area to be ground to form tip portions for supporting the axle of a rotational member.
17. The archery bow limb of claim 15 , wherein said bow limb is formed from glass fibers and resin.
18. The bow limb of claim 17 , wherein said rib portion is substantially longitudinal.
19. The bow limb of claim 18 , wherein said rib portion has tapered edges from the rib portion into said limb.
20. The bow limb of claim 19 , wherein said rib portion has a substantially elliptical profile.
21. The bow limb of claim 19 , wherein said rib portion has a substantially rectangular profile.
22. The bow limb of claim 18 , wherein said rib portion increases the sectional modulus of said hinge portion of said limb.