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:
Jul. 22, 2008
Filed:
Dec. 21, 2004
Josef Husmann, Luzern, CH;
Elena Cortona, Thalwil, CH;
Josef Husmann, Luzern, CH;
Elena Cortona, Thalwil, CH;
Inventio AG, Hergiswil, CH;
Abstract
The present invention automatically detects the onset of instability of an elevator active ride control system and activates a system shutdown if it occurs. As an elevator car is guided along rails by guide elements, a plurality of sensors mounted on the car measure vibration transverse to a direction of travel. The signals from the sensors are input to a controller which in turn produces a controller output signal. This signal is used to energize an actuator positioned between the car and the guide elements and thereby dampen the vibrations acting on the car. As instability sets in, a controller signal increases. The controller signal is monitored by a comparator such that the actuator is deactivated if the controller signal becomes greater than a predetermined value.