| 摘要 |
An archery bow includes a rigid frame having an upper limb, an opposite lower limb and a handle therebetween. A bowstring has one end attached to an upper wheel rotatably mounted to the upper limb and another end attached to a lower wheel rotatably mounted to the lower limb. The lower limb screwthreadedly receives an adjustable, rotatable self-contained tensioning unit having a variably compressible power coil spring therein. A cam is rotatably mounted to the lower limb between the lower wheel and the tensioning unit and is engaged by a cable which connects the spring with the lower wheel so as to provide a resilient pull to establish a draw weight required to move the bowstring from an at-rest position to a drawn position. A pin is variably positioned on the lower wheel for movement towards an engagement with a stop member fixed on the lower limb so as to establish a desired draw length for the bow. An independently adjustable let-off mechanism is mounted on the lower limb and is engageable with the let-off pin for selectively reducing the draw weight on the bowstring once the bowstring reaches the drawn position.
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