Patent ID: 6698413
Filing Date: 2004-03-02
Classification: F41B

Abstract:
An archery bow comprising:a rigid frame having an upper limb, an opposite lower limb and a handle therebetween; an upper wheel rotatably mounted to a free end of the upper limb; a lower wheel rotatably mounted to a free end of the lower limb, the lower wheel having a sprocket attached thereto, the sprocket having a diameter which is smaller then the diameter of the lower wheel; a bowstring having one end attached to the upper wheel and another end attached to the lower wheel, the bowstring being windable about respective peripheries of the upper wheel and the lower wheel, and being moveable between an at-rest position and a drawn position; the lower limb having a cavity defined by wall structure threaded to receive a cooperably threaded, rotatable spring housing containing a compressible power coil spring having one end engaged against a bottom surface of the spring housing and an opposite end engaged by a holding member; a cable passing centrally through the power coil spring and having one end fastened to the holding member and an opposite end passing through- the spring housing and fixedly secured to the sprocket on the lower wheel; and a cam rotatably mounted to the lower limb between the lower wheel and the spring housing, the cam having a periphery engaged by the cable, wherein rotation of the spring housing relative to the lower limb will selectively change compression rate of the power coil spring without the need for dissassembly of the spring housing or requiring an adjustment tool to apply an adjustable torque transmitted through the cable to the lower wheel and thereby establish a variable draw weight required to move the bowstring to the drawn position.