Mechanical guns and projectors – Spring – Bow
Patent
1995-08-21
1997-07-22
Ricci, John A.
Mechanical guns and projectors
Spring
Bow
124900, F41B 510
Patent
active
056495226
ABSTRACT:
The adjustable combination pulley and cam wheel device is used on the compound archery bow of the present invention. The wheel device includes a circular disc-shaped round wheel which has an elongated slot extending transversly therethrough from one side to the other and intersecting the transverse center axis of the wheel. Supplemental slots may also be provided. A pair of brackets releasably secure an axle sleeve to the wheel through the slot in any desired location, so that it can be used as a simple pulley or cam. A transverse axle is secured to the upper bow limb through the axle sleeve. The wheel has a pair of spaced peripheral string grooves, in one of which is trained the upper end of a bowstring and in the other of which is trained the upper end of a return string. The string upper ends are releasably secured in hooks on opposite sides of the wheel, while the string lower ends are releasably secured to a cam which includes a bowstring-receiving hatchet-shaped disc along the longidutinal centerline of the bow, a return string ear-shaped disc rigidly connected to the hatchet-shaped disc on one side thereof, and a harness string-receiving C-shaped removeable module rigidly connected to the opposite side of the hatchet-shaped disc. The upper end of the harness string is bifurcated and connected to opposite sides of upper axle. The cam is eccentrically connected to a transverse axle connected to the lower bow limb. The cam is balanced against limb torque.
REFERENCES:
patent: 4337749 (1982-07-01), Barna
patent: 4515142 (1985-05-01), Nurney
patent: 4519374 (1985-05-01), Miller
patent: 4967721 (1990-11-01), Larson
patent: 5040520 (1991-08-01), Nurney
patent: 5301651 (1994-04-01), LaBorde et al.
patent: 5368006 (1994-11-01), McPherson
Nist Donald E.
Ricci John A.
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