Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Philippe Henneau0
Date of Patent
April 19, 2011
0Patent Application Number
120241850
Date Filed
February 1, 2008
0Patent Primary Examiner
Patent 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 way 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 drive unit via a safety circuit.
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