The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2015
Filed:
Jun. 30, 2009
Uwe Schoenauer, Berlin, DE;
Andreas Belkner, Berlin, DE;
Uwe Schoenauer, Berlin, DE;
Andreas Belkner, Berlin, DE;
Otis GmbH & Co. OHG, , DE;
Abstract
When main power to an elevator systemis lost, an automatic rescue operation is performed using power from a backup power source. A rescue run for an elevator stopped between floors is initiated by lifting a brakeand allowing the elevator carto move by gravity. If the carmoves as a result of a weight imbalance between the carand a counterweight, operation of the hoist motoris synchronized with sensed movement of the carto generate electricity. If weight is balanced so that the cardoes not move, backup power is supplied to the hoist motorto apply a motor torque to drive the carin a selected direction during the rescue run.