Claims
- 1. A compound archery bow, comprising:
- a handle;
- a pair of resilient bow limbs each with a mounting portion opposing a tip portion, said mounting portion of each of said bow limbs being fastened to said handle opposite the other;
- a pulley system for providing let-off, including a bowstring, a take-up string, and a pair of cam wheels, said wheels each being pivotally mounted to said tip portion of each of said bow limbs with said bowstring and said take-up string being mounted under tension therebetween, said wheels each including:
- a peripheral bowstring track engaged by said bowstring and having a first working length,
- a peripheral take-up string track engaged by said take-up string and having a second working length; and
- wherein a working length ratio of said first working length to said second working length is at least about 2.5; and
- wherein said handle includes a hand grip positioned between a pair of bow limb pockets, said mounting portion of each of said bow limbs being received in a corresponding one of said pockets, and each of said pockets has a rake angle of less than about 15 degrees.
- 2. The bow of claim 1, wherein said working length ratio is at least about 3.
- 3. The bow of claim 1, wherein said bowstring track has a maximum bowstring track radius, said take-up string track has a maximum take-up string radius, and a maximum radius ratio of said maximum bowstring track radius to said maximum take-up string radius is at least about 1.75.
- 4. The bow of claim 1, wherein said pulley system has a cam ratio of at least about 5 for a drawn position of the bow.
- 5. The bow of claim 1, wherein said bow limbs each have a pre-curved portion between said mounting portion and said tip portion.
- 6. The bow of claim 1, wherein said tip portion of each of said bow limbs defines a slot with a pair of arms, and said arms define an axle passage therethrough for correspondingly mounting said wheels thereto.
- 7. A compound archery bow assembly, comprising:
- a riser with a pair of limb pockets each having a rake angle of less than about 15 degrees;
- a first resilient bow limb and a second resilient bow limb each mounted to a corresponding one of said pockets, said first limb having a mounting portion fastened to said riser, and having a free end portion defining a slot between a pair of arms;
- a pulley system for providing let-off including a bowstring, a take-up string, a first cam wheel received at least partially within said slot and being journaled to said free end portion to rotate about a first rotational axis, and a second cam wheel journaled to said second limb to rotate about a second rotational axis; and
- wherein said first limb is configured to position said first rotational axis a rearward distance and an outward distance from a point of departure of said first limb from said riser relative to an axle-to-axle axis intersecting said first and second rotational axes, and a ratio of said rearward distance to said outward distance is in a range of about 0.2 to 2 when the bow assembly is unstrung.
- 8. The bow assembly of claim 7, wherein said ratio is in a range of about 0.25 to 0.050.
- 9. The bow assembly of claim 7, wherein said ratio is in a range of about 0.30 to 0.35.
- 10. The bow assembly of claim 7, wherein said first bow limb includes a pre-curved portion having a curvature with a bend radius sweeping an angle of at least about 35 degrees when the bow assembly is unstrung.
- 11. The few assembly of claim 7, wherein said first limb has a generally planar mounting portion defining a mounting opening for fastening to said riser and a pre-curved portion intergrally connecting said mounting portion and said free end portion, and said pre-curved portion has a radius of curvature between about 15 to 25 inches when the bow is unstrung and between about 6 and 12 inches when the bow is strung.
- 12. The bow assembly of claim 7, wherein said wheel includes a first track having a first tack maximum radius, a second track having a second track maximum radius, and a maximum radius ratio of said first track maximum radius to said second track maximum radius of at least about 1.75.
- 13. The bow assembly of claim 7, wherein said wheel includes a peripheral bowstring track having a first working length, a peripheral take-up string track having a second working length, and a working ratio of said first working length to said second working length of at least about 2.5.
- 14. The bow of claim 7, wherein said rearward distance is at least about 2 inches.
- 15. A compound archery bow, comprising:
- a riser;
- a first resilient bow limb and a second resilient bow limb each mounted to said riser opposite one another, said first limb having a mounting portion fastened to said riser and a tip portion defining a slot between a pair of arms;
- a pulley system for providing let-off including a bowstring, a take-up string, a first cam wheel received at least partially within said slot and being journaled to said tip portion to rotate about a rotational axis, a second cam wheel journaled to said second limb, said bowstring and said take-up string being mounted under tension between said first and second limbs and each engaging said first and second wheels; and
- wherein said first limb follows a curved path to provide an outward and rearward position of said rotational axis relative to a point of departure of said first limb from said riser, and said position corresponds to an angle of at least about 30 degrees between a first axis tangent to said path and intersecting said point and a second axis intersecting said point and said rotational axis.
- 16. The bow of claim 15, wherein said angle is at least about 35 degrees.
- 17. The bow of claim 15, wherein said first and second wheels each include a first track having a first track maximum radius, a second track having a second track maximum radius, and a maximum radius ratio of said first track maximum radius to said second track maximum radius of at least about 1.75.
- 18. The bow of claim 15, wherein said first and second wheels each include a peripheral bowstring track having a first working length, a peripheral take-up string track having a second working length, and a working length ratio of said first working length to said second working length of at least about 2.5.
- 19. The bow of claim 15, wherein said riser includes a pair of oppositely disposed limb pockets each having a rake angle of less than about 10 degrees.
- 20. A compound archery bow, comprising:
- a riser defining a first limb pocket opposite a second limb pocket;
- a first bow limb with a first mounting portion opposite a first tip portion, said first mounting portion being mounted in said first limb pocket;
- a second bow limb with a second mounting portion opposite a second tip portion, said second mounting portion being mounted in said second limb pocket;
- a pulley system for providing let-off, including a bowstring, a cable, a first cam wheel, and a second cam wheel, said first cam wheel being mounted to said first tip portion to rotate about a first rotational axis, said second cam wheel being mounted to said second tip portion to rotate about a second rotational axis, said bowstring and said cable being strung between said first and second cam wheels; and
- wherein said first and second limb pockets each have a rake angle of no more than about 15 degrees relative to a longitudinal axis parallel to said bowstring when undrawn, said first and second rotational axes are each displaced a first distance along said longitudinal axis when said bowstring is drawn, said first and second rotational axes are each displaced a second distance along an arrow path axis generally perpendicular to said longitudinal axis when said bowstring is drawn, and a displacement ratio of said first distance to said second distance is at least about 2.0.
- 21. The bow of claim 20, wherein said first and second cam wheels each include:
- a peripheral bowstring track engaged by said bowstring and having a first working length,
- a peripheral take-up string track engaged by said cable and having a second working length; and
- wherein a working length ratio of said first working length to said second working length is at least about 2.5.
- 22. The bow of claim 21, wherein said bowstring track has a maximum bowstring track radius, said take-up string track has a maximum take-up string radius, and a maximum radius ratio of said maximum bowstring track radius to said maximum take-up string radius is at least about 1.75.
- 23. The bow of claim 20, wherein said displacement ratio is at least about 3.0.
- 24. The bow of claim 20, further comprising a first axle and a second axle, and wherein:
- said first and second bow limbs each have a pre-curved portion between said mounting portion and said tip portion with a bend radius sweeping an angle of at least about 35 degrees when the bow is unstrung;
- said first tip portion defines a first slot intersecting a first axle passage;
- said second tip portion defines a second slot intersecting a second axle passage;
- said first cam wheel is rotatably mounted in said first slot by receiving said first axle in said first axle passage; and
- said second cam wheel is rotatably mounted in said second slot by receiving said second axle in said second axle passage.
- 25. A compound archery bow for shooting an arrow comprising:
- a rigid handle;
- a precurved bow limb means connected to said handle for storing and releasing energy to propel an arrow; and
- a pulley system to providing let-off, said pulley system including a pair of wheels each pivotably mounted to said precurved bow limb means, and a bowstring mounted under tension between said pair of wheels, said bowstring being configured to engage said arrow;
- wherein said precurved bow limb means has no reverse curvature between said handle and said wheels.
- 26. The bow of claim 25, wherein said wheels are each displaced a first distance along a first axis generally parallel to an arrow path axis defined by the bow when said bowstring is drawn, said wheels are each displaced a second distance along a second axis generally perpendicular to said first axis when said bowstring is drawn, and said second distance is greater than said first distance.
- 27. The bow of claim 25, wherein said bow limb means includes a first precurved bow limb and a second precurved bow limb.
- 28. The bow of claim 25, wherein said pulley system includes a take-up string and said wheels each include:
- a peripheral bowstring track engaged by said bowstring and having a first working length;
- a peripheral take-up string track engaged by said take-up string and having a second working length; and
- a working length ratio of said first working length to said second working length of at least about 2.5.
- 29. The bow of claim 25, wherein said pulley system includes a cable and said wheels each have:
- a first track engaged by a portion of said bowstring and having a first track maximum radius;
- a second track engaged by a portion of said cable and having a second track maximum radius; and
- a maximum radius ratio of said first track maximum radius to said second track maximum radius of at least about 1.75.
Parent Case Info
The present application is a continuation-in-part of application Ser. No. 08/572,510 filed Dec. 14, 1995 now U. S. Pat. No. 5,749,351
US Referenced Citations (27)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
572510 |
Dec 1995 |
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