High energy compound bow

Details High energy compound bow High energy compound bow

1987-02-06

1988-07-12

Reese, Randolph A.

Mechanical guns and projectors

Spring

Bow

124 23R, 124DIG1, F41B 500

Patent

active

047562960

ABSTRACT:
A high energy compound bow having multiple pulley sheaves eccentrically mounted on a common axis at each bifurcate distal end of the respective bow limbs. The bowstring is extended at each end over the pulley sheaves to a return cable, the ends of which are looped over anchor sheaves at the respective axles. The anchor sheaves are clustered centrally of the space between the bifurcate sections of the bow limbs with the bowstring pulley and a transition pulley which is positioned between the bowstring pulley and the anchor sheave. The transition sheave has a curved path which originates laterally of the bow limb essentially at the lateral position of the anchor sheave in the at-rest position of the bowstring. This sheave path shifts laterally as the bow is drawn to a position central to the bowstring pulley and the anchor sheave thereby centralizing the tension stress on the bow limbs to eliminate torque on the limbs at the high tension phase of the draw and release. The composite pulley may be formed of two molded parts to permit varying draw lengths to be utilized on a particular bow. The secondary pulley section is formed with a minimal lateral dimension and radial clearance at the axle to provide space for location of an anchor sheave close to the center of the axle without interference during rotation. The secondary pulley then sweeps laterally outward to provide the secondary pulley sheaves spaced from the primary pulley. Outer cam surfaces on the pulley sheaves insure positive tracking of the return cables as they move toward the center.

REFERENCES:
patent: 3486495 (1969-12-01), Allen
patent: 4338910 (1982-07-01), Darlington
patent: 4340025 (1982-07-01), Caldwell
patent: 4515142 (1985-05-01), Nurney
patent: 4686955 (1987-08-01), Larson
Bow and Arrow, Oct. 1985, p. 4.

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