Trolley hoist with a rack and pinion drive system

Modification in a trolley hoist, implementing a rack and pinion system.

This system allows the trolley movements to be very precise, avoiding the possibility of the wheels slipping.

The two bronze gears are driven by the trolley motor and the two steel gears are rolling on the rack.

The idle trolley wheels remain the same as before. The only change to be made is placing a spacer in the wheels rolling path in order to compensate the rack's height.