Electric elevator car driving device

Abstract From the Canadian patent

An electric elevator car drive has a sheave having grooves lines with non-metallic linings and a controller, which stops the elevator car when the linings are damaged. The grooves of the sheave have a plurality of metallic projections projecting thereinto which are normally covered by the non-metallic layers but which come into secure engagement with the cable when the layers are damaged. A fault detector detects the damage done to the layers, and, when damage to the layers are detected the, controller stops the elevator car at the nearest floor at which it can be stopped safely without damage to the cables suspending the elevator car.