A worm gear is a spiral thread simial to a thread on a bolt. The worm gear engages a bevel gear, as the worm gear turns its threads push the teeth of the bevel gear cauing the bevel gear to rotate.
The thread angle is such that only the worm gear may be truned to drive th larger gear. If the larger gear is attempted to be turned the teeth of teh bevel gear just jame against the worm gear keeping the larger gear locked in position.
This means that a worm gear only lets power flow in one direction from the worm to the gear but not the other way around.
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