| 摘要 |
A first member is pivotally connected to a base for rotation about a first axis, and a second member is pivotally connected to the first member for rotation about a second axis. One end of a cable is attached to the base at a point spaced from the first axis, and the other end of the cable is attached to the second member at a point spaced from the second axis. The cable is slidingly engaged by a portion of the first member. As the first member is driven to rotate with respect to the base, the second member is forced to rotate with respect to the first member due to the inextensibility of the cable.
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