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US 8,281,775 B1Granted
Synchronized compound archery bow
AssigneeLarson Archery Company
InventorMarlow W. Larson
Life of this patent
Estimating the term…
Abstract
A rigging structure for a compound archery bow includes first and second pulley assemblies, pivotally mounted on axles at tips of corresponding first and second limbs of a compound bow and interconnected by cables. Each pulley assembly includes a dynamic synchronizing component, and the rigging preferably also includes structure adapted to avoid the usual leaning moment imposed upon the pulley assemblies by the cables of conventional riggings.
Claims18
A compound archery bow that includes:
- a handle having projecting limbs, a first pulley mounted on a first of said limbs for rotation around a first axis, a second pulley mounted on a second of said limbs for rotation around a second axis, and bow cable means including a bowstring cable extending from bowstring let-out grooves on said first and second pulleys, a first cable extending from a cable take-up groove on said first pulley to second cable let-out means on said second pulley, and a second cable extending from a cable take-up groove in said second pulley to first cable let-out means on said first pulley such that draw of said bowstring cable away from said handle lets out bowstring cable from said let-out grooves on said first and second pulleys, rotates said first and second pulleys around said axes, and lets out portions of said first and second cables from said first and second cable let-out means on said first and second pulleys, wherein at least one of said bowstring let-out grooves and/or at least one of said cable take-up grooves is non-circular and wherein at least one of said first and said second cable let out means comprises a non circular spooling surface.
Rigging for a compound archery bow comprising:
- first and second pulley assemblies, mounted to pivot on respective axles at tips of corresponding first and second limbs of a compound bow;
- each assembly including:
- a non-circular peripheral string groove;
- a non-circular peripheral cable take-up groove;
- and
- a dynamic synchronizing component with a non-circular let out structure;
- a bowstring with opposite ends connected to said first and second pulley assemblies such that, at rest condition of the bow, the peripheral string grooves are substantially occupied by wrapped bowstring;
- a first cable segment, extending from the entry of the peripheral cable take-up groove of said first pulley assembly to the dynamic synchronizing component of said second pulley assembly;
- and
- a second cable segment, extending from the entry of the peripheral cable take-up groove of said second pulley assembly to the dynamic synchronizing component of said first pulley assembly;
- said first and second pulley assemblies being structured and arranged such that as said bowstring is pulled from its said rest position towards its drawn position, respective first ends of said first and second cable segments wrap onto the peripheral cable take-up grooves of said first and second pulley assemblies, respectively, and respective second ends of said first and second cable segments operably interact with the dynamic synchronizing components of said second and first pulley assemblies, respectively.
8 more elements
Rigging for a compound archery bow comprising:
- first and second pulley assemblies, mountable to pivot under cross-coupled condition on respective axles at tips of corresponding first and second limbs of a compound bow;
- each assembly including:
- a peripheral string groove;
- a peripheral cable take-up groove;
- and
- a dynamic synchronizing component comprising a non-circular spooling surface.
3 more elements
A pulley assembly mounted to pivot on an axle at a limb tip of a compound bow;
- said assembly including:
- a non-circular peripheral string groove;
- a non-circular peripheral cable take-up groove;
- a dynamic synchronizing component with a non-circular let out structure;
- and
- anchor structure for a synchronizing cable, said anchor structure being disposed to hold an end of a synchronizing cable for letting out and taking up said synchronizing cable with respect to said non-circular let out structure, wherein:
- said peripheral cable take-up groove and said synchronizing component are disposed on the same side of a plane containing said string groove.
4 more elements
Rigging for a compound archery bow comprising:
- a pulley assembly adapted to pivot about an axis of rotation transverse a tip of a limb of said bow, said pulley assembly including:
- a bowstring pulley sheave with a peripheral bowstring groove that is substantially occupied by bowstring at brace position;
- a take-up pulley sheave portion with a peripheral cable take-up groove;
- and
- a dynamic synchronizer sheave portion;
- said pulley assembly being structured to permit installation of said pulley assembly on said limb such that draw of an installed bowstring, away from said brace position and toward a full-draw position:
- unwinds a portion of bowstring from said bowstring groove;
- unwinds a synchronizing end portion associated with a first power cable from said dynamic synchronizer sheave portion;
- and
- winds a take up portion associated with a second power cable onto said cable take-up groove;
- wherein:
- a bowstring plane, in which the centerline of said bowstring travels during draw of an arrow from said brace position, intersects said axis of rotation;
- and
- at said brace position before effect of a cable guard is applied, a first normal distance between said bowstring plane and a tension vector in a central stretch of said first power cable near said synchronizing end portion is no larger than a second normal distance between said bowstring plane and a tension vector in a central stretch of said second power cable near said take-up portion, said first distance and said second distance being measured in the same direction from said bowstring plane.
11 more elements
Dependencies are inferred from the claim text.