Compound archery bow
DCFirst Claim
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.
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Accused Products
Abstract
Disclosed is a compound archery bow having a handle, a pair of resilient bow limbs, and a pulley system for providing let off. Each of the bow limbs has a mounting portion opposing a tip portion. The mounting portion of each of the bow limbs is fastened to the handle opposite the other. The pulley system includeds a bowstring, a take-up string, and a pair of cam wheels. The wheels are each pivotally mounted to a corresponding bow limb tip portion with the bowstring and take-up string being mounting under tension therebetween. Each of the wheels includes a peripheral bowstring track with a first working length and a peripheral take-up string track with a second working length. A ratio of the first working length to the second working length is at least about 2.5. Additional or alternative cam wheel features include a maximum radius ratio of the first track maximum radius to the second track maximum radius of at least about l.75, in a cam ratio of at least 5 for a drawn position of the bow. An uniquely pre-curved bow limb and related compound bow assemblies are also disclosed.
78 Citations
29 Claims
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1. A compound archery bow, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A compound archery bow assembly, comprising:
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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. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A compound archery bow, comprising:
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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. - View Dependent Claims (16, 17, 18, 19)
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20. A compound archery bow, comprising:
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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. - View Dependent Claims (21, 22, 23, 24)
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25. A compound archery bow for shooting an arrow comprising:
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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. - View Dependent Claims (26, 27, 28, 29)
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Specification