Glossary of Terms : U - Z


Variable Voltage

A method of controlling a lift machine, which produces many different speeds.

Worm

A shaft on which a spiral groove is cut.

Worm Gear

The gear wheel which engages the revolving worm. The rotating motion of the worm is transmitted through the worm gear to the drive sheave.

Zoning

The procedure which involves parking designated lifts to serve a specified floor or group of floors.