Energy storage system for a bow
An energy storage system for a bow, the system defined at least in part by a riser, a first and second limb each having a first end coupled to the riser, a first and second wheel disposed at a second end of respective first and second limbs, a first and second power cord each having a first end coupled to the riser and a second end coupled to respective first and second wheels, and a string extending between and coupled to the first and second wheels.
1. A bow, comprising:
a riser;
a first limb and a second limb, each limb comprising a first end and a second end, wherein the first end of each limb is coupled to the riser;
a first wheel rotatably coupled to the first limb proximate the second end thereof, the first wheel comprising:
an upper pulley and a lower pulley;
a spool extending between and affixed to the upper and lower pulleys;
a stud disposed between and affixed to at least one of the upper and lower pulleys; and
a post disposed between and affixed to at least one of the upper and lower pulleys;
a second wheel rotatably coupled to the second limb proximate the second end thereof, the second wheel comprising:
an upper pulley and a lower pulley;
a spool extending between and affixed to the upper and lower pulleys;
a stud disposed between and affixed to at least one of the upper and lower pulleys; and
a post disposed between and affixed to at least one of the upper and lower pulleys;
a first power cord, comprising:
a first end coupled to the riser; and
a second end coupled to the stud of the first wheel;
a second power cord, comprising:
a first end coupled to the riser; and
a second end coupled to the stud of the second wheel; and
a string, comprising:
a middle section comprising a first end and a second end;
a first section coupled to the middle section at the first end thereof, the first section comprising:
a first end coupled to the upper pulley of the first wheel; and
a second end coupled to the lower pulley of the first wheel; and
a second section coupled to the middle section at the second end thereof, the second section comprising:
a first end coupled to the upper pulley of the second wheel; and
a second end coupled to the lower pulley of the second wheel.
2. The bow of claim 1 , wherein
at least a portion of the first section of the string wraps around the upper and lower pulleys of the first wheel;
at least a portion of the second section of the string wraps around the upper and lower pulleys of the second wheel;
at least a portion of the first power cord wraps around the post of the first wheel and extends between the spool and the post of the first wheel; and
at least a portion of the second power cord wraps around the post of the second wheel and extends between the spool and the post of the second wheel.
3. The bow of claim 2 , wherein at least a portion of the first and second power cords wrap onto the spool of their respective first and second wheel when at least a portion of the middle section of the string is pulled in the proximal direction.
4. The bow of claim 3 , wherein at least a portion of the first and second power cords unwrap from the spool of their respective first and second wheel when the middle section of the string is released.
5. The bow of claim 3 , wherein the second ends of the first and second limbs displace towards each other.
6. The bow of claim 2 , wherein at least a portion of the first and second sections of the string unwrap from the upper and lower pulleys of their respective first and second wheel when at least a portion of the middle section of the string is pulled in the proximal direction.
7. The bow of claim 6 , wherein at least a portion of the first and second power cords wrap onto the spool of their respective first and second wheel.
8. The bow of claim 6 , wherein the second ends of the first and second limbs displace towards each other.
9. The bow of claim 6 , wherein at least a portion of the first and second sections of the string wrap onto the upper and lower pulleys of their respective first and second wheel when the middle section of the string is released.
10. The bow of claim 9 , wherein at least a portion of the first and second power cords unwrap from the spool of their respective first and second wheel.
11. The bow of claim 1 , comprising:
a first coupler for coupling the middle and first sections of the string to each other; and
a second coupler for coupling the middle and second sections of the string to each other.
12. The bow of claim 11 , wherein:
the first coupler is a first yoke splitter; and
the second coupler is a second yoke splitter.
13. The bow of claim 1 , wherein
the first section of the string extends through a loop at the first end of the middle section; and
the second section of the string extends through a loop at the second end of the middle section.
14. The bow of claim 1 , wherein
the first limb comprises an upper limb and a lower limb;
the first wheel is disposed between the upper and lower limbs of the first limb;
the second limb comprises an upper limb and a lower limb; and
the second wheel is disposed between the upper and lower limbs of the second limb.
15. The bow of claim 14 , comprising:
a first axle extending through the spool of the first wheel, the first axle rotatably coupling the first limb and the first wheel to each other; and
a second axle extending through the spool of the second wheel, the second axle rotatably coupling the second limb and the second wheel to each other.
16. The bow of claim 15 , wherein the string is distal of the first and second axles when the string is not drawn.
17. The bow of claim 15 , wherein the string is proximal of the first and second axles when the string is not drawn.
18. The bow of claim 1 , comprising a reverse draw crossbow.
19. The bow of claim 1 , configured to eliminate or minimize cam lean.
20. The bow of claim 1 , comprising:
a first tension rod for coupling the first power cord to the riser, the first tension rod comprising:
a first end coupled to the riser; and
a second end coupled to the first end of the first power cord; and
a second tension rod for coupling the second power cord to the riser, the second tension rod comprising:
a first end coupled to the riser; and
a second end coupled to the first end of the second power cord.
21. The bow of claim 20 , wherein:
a length of the first tension rod is adjustable; and
a length of the second tension rod is adjustable.
22. The bow of claim 20 , comprising a cable hanger comprising:
a first end coupled to the first tension rod proximate the second end thereof; and
a second end coupled to the second tension rod proximate the second end thereof.
23. The bow of claim 22 , wherein:
a length of the first tension rod is adjustable; and
a length of the second tension rod is adjustable.
24. The bow of claim 1 , comprising an energy storage system defined at least in part by:
the first and second limbs;
the first and second wheels;
the first and second power cords; and
the string.
25. The bow of claim 1 , wherein the first and the second wheels are configured as cams.
26. The bow of claim 1 , wherein the first and the second wheels are devoid of spiraling grooves.