These overspeed governors are set in motion when the levers open by centrifugal force, both in ascent and descent, when the cabin overspeeds. The locking device for overspeeding is created by the centrifugal forcé which opens the levers pushing them towards a roller in the centre of the pulley where a solid, fixed locking device connects with the axis of the pulley via a wedge.
The roller revolves in the same direction as the lift until it touches the disc of the locking device and is stopped between the disc and the wedge of th pulley, thus producing the mechanical locking of the oberspeed governor. This system allows infinite locking points as they can be produced in any part of the roller around the disc. These overspeed governor are valid for setting off instantaneous grip gears with rollers, which are instantaneous with a cushioning and progressive effect.