Compound bow with rotational indicators for eccentric wheels on bow limbs

Abstract

An eccentric indicator in combination with a compound bow the compound bow has rotatable eccentric wheels at the ends of the bow limbs, around which cables forming part of the bowstring are trained. The indicator comprises a pair of rotatable indicator wheels mounted above and below a simulated arrow shaft, about three-quarters of the distance back from the front end thereof. Flexible cords pass around pulleys mounted on the sides of the indicator wheels, and one cord is attached at one end of the bowstring close to the upper eccentric wheel, while the other cord is attached at one end to the bowstring close to the lower eccentric wheel. The other ends of the cords are attached to elastic cords, which are fastened to the front end of the shaft. When the device is used in place of an arrow and the bow is drawn, the indicator wheels are turned by the cords as the latter are pulled by the elastic cords to take up slack due to rotation of the eccentric wheels. If the eccentric wheels are turning in synchronism, the indicator wheels will rotate as though geared together. If the indicator wheels rotate at different rates, it is an indication that adjustment of the bow is necessary. The two indicator wheels, being located close together and in the archer's line of sight, enable him to see simultaneously the relative rates of rotation of the eccentric wheels on the ends of the bow.