Lift and method of monitoring a lift
AssigneeInventio AG
InventorPHILIPPE HENNEAU
Life of this patent
Estimating the term…
Abstract
A lift drive unit has at least one monitoring device for monitoring unallowed raising of a lift cage. The drive unit has a motor unit and a deflecting unit. If a counterweight supported by the deflecting unit, for example rests on a shaft pit buffer, the deflecting unit is unloaded and is raised by means of a spring element of the monitoring device. A sensor of the monitoring device detects the movement of the deflecting unit and switches off the motor of the motor unit via a safety circuit.
Claims6
A lift with a lift cage and a counterweight movable in a lift shaft, wherein support means connect and support the lift cage and the counterweight and a drive unit drives the support means, characterized in that at least one spring element acting as a force store and for raising the drive unit when the support means is unloaded is provided at the drive unit and that at least one sensor for detecting the raising of the drive unit and for switching off the motor of the drive unit is provided.
A method of monitoring a lift with a lift cage and a counterweight movable in a lift shaft, wherein support means connect and support the lift cage and the counterweight and a drive unit drives the support means, characterized in that a raising of the drive unit caused by a reduction in support means load is monitored and the drive unit is switched off when the drive unit is raised.
Dependencies are inferred from the claim text.