| 摘要 |
A compound bow having a handle, upper and lower limbs, and a bowstring. Upper and lower pulleys are mounted on the bow. Each pulley has a helical groove of three turns, one turn having a different diameter from the other two. Tension cables travel around two of the three turns of the pulleys. As the bowstring is drawn, the pulleys rotate 360 degrees, and the cables unwind from one turn and wind onto a different turn.
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