The lifting mechanism that loads tires into presses was subject to occasional drive system failures. This resulted in a 700 to 3000 lb. (318 to 1361 kg.) device failing. Several safety brakes were tried but did not work satisfactorily. Equipment damage and safety concerns necessitated a better solution.


The key turned out to be in controlling very closely the preset spring forces and the use of very stable friction material. This design also include a one-way clutch so that the drive is used to pull the loader down. The brake offers no resistance in the up direction.

The reduced wear rate significantly extended the life of all of the drive components including the overload device. This resulted in increased production and safety.