Patent ID: 6076512
Filing Date: 2000-06-20
Classification: F41B

Abstract:
In an archery bow for launching an arrow, having an upper cam pulley means attached to a distal end of an upper flexible limb, for providing a let-off of force to a draw string in a full drawn position, and having a handle-riser with an upper and a lower end, the upper end being attached to a proximal end of the upper flexible limb, and having a lower flexible limb with a proximal end and a distal end, the proximal end of the lower flexible limb being attached to the lower end of the handler-riser, and the distal end of the flexible limb being attached to a lower cam pulley means, the lower cam pulley means providing additional let-off of force to the draw string in a full drawn position, and the archery bow having an upper power string having passage along the upper cam pulley means, and the archery bow having a lower power string having a passage along the lower cam pulley means, and the archery bow having an upper limb string attached to the distal end of the upper limb, and having a lower limb string attached to the distal end of the lower limb, and having a draw string with an upper end and a lower end, the upper end having passage along the upper cam pulley means, and the lower end having passage along the lower cam pulley means, the archery bow improvement comprising;A. a synchronizing pulley means attached to the handle-riser, said synchronizing pulley means comprising one or more axisymmetric synchronizing pulleys that provide passage for the upper power string, the lower power string, the upper limb string, and the lower limb string, and the power and limb strings do not slip with respect to each other;B. the upper and lower flexible limbs being coupled to said synchronizing pulley means via the upper and lower limb strings such that take-up and pay-out of the upper and lower limb strings are equal, requiring that both limbs move equal amounts in a synchronous manner.