Worms 1 and 2 rotate about fixed axes B and A, and are driven by handwheels 4 and 5. Worms 1 and 2 mesh with worm wheels 6 and 7 which rotate about fixed axes D and E. Flexible link 9 runs over pulley 8 and its ends are wound on pulleys 10 and 11 which are rigidly attached to (or integral with) wheels 6 and 7. Pulley 8 is connected by turning pair C to slide 3 which moves in fixed guide b. Spring 12 tensions flexible link 9, eliminating slack in the mechanism. The linear travel of slide 3 can be the sum of two rotary motions accomplished by handwheels 4 and 5.
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