| 摘要 |
The present invention relates to archery, and more specifically relates to a compound bow of reduced size and weight comprising short limbs (Li), small pulleys and small cams while maintaining the performance of the prior art by linking a differential motion cam and a differential motion pulley of a novel design. The present invention has devised a method for dispensing with large cams and decreasing the scale of compound bows by using three different stratagems. The compound bow is decreased in scale through 1. the use of an idler pulley (IP) and a differential motion cam which rotates by a large extent as shown in FIG. 3, 2. the use of both a Y-cam (YC) which rotates by a large extent and a differential motion cam as shown in FIG. 11, and 3. the use of a combination of Y-cams (YC) which rotate by a large extent as shown in FIG. 16; and this compound bow can be used, by way of example, for hunting and sports and for shooting ropes for life saving purposes. |
