Archery bow with circular string track

Patent metadata

Field	Value
Publication number	US-9958231-B2
Application number	US-201615230270-A
Country	US
Kind code	B2
Filing date	Aug 5, 2016
Priority date	May 30, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

In some embodiments, an archery bow comprises a riser, a first limb supported by the riser and a second limb supported by the riser. A first rotatable member is supported by the first limb and arranged to rotate on a first axis and a second rotatable member is supported by the second limb and arranged to rotate on a second axis. The first rotatable member comprises a first bowstring track comprising a first portion and a second portion, the first portion having a constant radius and a center located on the first axis, the second portion having a varying radius. A bowstring comprises a first end attached to the first rotatable member and a second end attached to the second rotatable member.

First claim

The invention claimed is:

1. An archery bow comprising:
riser;
a first limb supported by said riser;
a second limb supported by said riser;
a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a bowstring track;
a second rotatable member supported by said second limb and arranged to rotate on a second axis; and
a bowstring comprising a first end attached to said first rotatable member, the bowstring extending to said second rotatable member;
wherein said bowstring track comprises a first portion and a second portion, said first portion comprising a circular arc having a constant radius from the first axis, said circular arc extending at least 90 degrees about said first axis, said second portion comprising a non-circular arc having a varying radius from said first axis, said non-circular arc extending at least 90 degrees about said first axis, said constant radius being greater than any portion of said varying radius.

2. The archery bow of claim 1 , said bowstring track comprising a working portion that feeds out said bowstring as the bow is drawn, the working portion comprising said first portion and said second portion.

3. The archery bow of claim 2 , said working portion consisting of said first portion and said second portion.

4. The archery bow of claim 2 , said circular arc comprising at least half of a length of said working portion.

5. The archery bow of claim 1 , wherein an outer periphery of said first rotatable member comprises a circular portion and a non-circular portion.

6. The archery bow of claim 1 , said second rotatable member comprising a second bowstring track, said second bowstring track comprising a circular arc having a constant radius from the second axis.

7. The archery bow of claim 6 , wherein a shape of said first rotatable member comprises a mirror image of a shape of said second rotatable member.

8. The archery bow of claim 1 , wherein said circular arc extends at least 180 degrees.

9. The archery bow of claim 1 , said bowstring track being a first bowstring track, said second rotatable member comprising a second bowstring track, a shape of the second bowstring track being a mirror image of a shape of the first bowstring track.

10. An archery bow comprising:
a riser;
a first limb supported by said riser;
a second limb supported by said riser;
a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a bowstring track and a first cam track;
a second rotatable member supported by said second limb and arranged to rotate on a second axis, said second rotatable member comprising a bowstring track and a second cam track;
a first power cable comprising a segment in contact with said first cam track; and
a second power cable comprising a segment in contact with said second cam track; and
a bowstring extending between said first rotatable member and said second rotatable member;
wherein an outer periphery of the first rotatable member comprises a first portion and a second portion, said first portion comprising a circular arc having a constant radius from the first axis, said circular arc extending at least 90 degrees about the first axis, said second portion comprising an arc having a varying radius from the first axis, said outer periphery being continuously concave with respect to the first axis.

11. The archery bow of claim 10 , wherein said outer periphery consists of said first portion and said second portion.

12. The archery bow of claim 10 , wherein a radial distance from said first axis to said second portion is less than said constant radius.

13. The archery bow of claim 10 , wherein said bowstring track comprises said first portion and said second portion.

14. The archery bow of claim 10 , said bowstring track comprising a working portion that feeds out said bowstring as the bow is drawn, the working portion comprising said first portion and said second portion.

15. The archery bow of claim 14 , said circular arc comprising at least half of a length of said working portion.

16. The archery bow of claim 10 , wherein said circular arc extends at least 180 degrees.

17. The archery bow of claim 10 , said first power cable comprising a first end and a second end, the first end attached to the first rotatable member, the second end attached to the second rotatable member.

18. An archery bow comprising:
a riser;
a first limb supported by said riser;
a second limb supported by said riser;
a bowstring;
a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a bowstring track having a working portion, said working portion arranged to feed out said bowstring as the bow is drawn; and
a second rotatable member supported by said second limb and arranged to rotate on a second axis, said second rotatable member comprising a second bowstring track;
said working portion comprising a first portion and a second portion, said first portion comprising a circular arc having a constant radius from the first axis, said circular arc comprising approximately 50% of said working portion, said second portion comprising an arc having a varying radius from the first axis, said second portion occupying the remainder of said working portion, said constant radius being greater than any portion of said varying radius.

19. The archery bow of claim 18 , wherein an entire length of said second portion comprises curvature.

20. The archery bow of claim 18 , a shape of said second bowstring track being a mirror image of a shape of said bowstring track.

Assignees

• Mcp Ip Llc

Inventors

• Mcpherson Mathew A
• Simonds Gary L

Classifications

• F41B5/1403

  Details of bows; (camera's on bows F41B5/1492) · CPC title

• F41B5/105 Primary

  Cams or pulleys for compound bows · CPC title

• F41B5/10

  Compound bows {(compound crossbows F41B5/123)} · CPC title

• F41B5/1469

  Bow-string drawing or releasing devices (F41B5/1473 takes precedence) · CPC title