Otis Elevator Company

Jose M Carballo

Daryl J Marvin

Harold Terry

Anthony Cooney

James M Draper

Greg A Schienda

An elevator system includes an electronic system capable of triggering a machine room brake and an electromagnetic safety trigger with low hysteresis and with minimal power requirements that can be released to engage safeties, when car over-speed and/or over-acceleration is detected. The electromagnetic trigger may be reset automatically and may be released to engage the safeties, during the reset procedure. The system includes a processing system that is configured to decrease response time and to reduce the occurrence of false triggers caused by conditions unrelated to passenger safety, such as passengers jumping inside the elevator car.

Elevator over-acceleration and over-speed protection system

An elevator systemincludes an over-acceleration and over-speed protection system capable of triggering a machine room brake and a safety trigger when over-speed or over-acceleration conditions are detected. The system includes a speed detectorand an acceleration detector. Based upon sensed speed and sensed acceleration, the controllercalculates a filtered speed of an elevator mass such as an elevator caror counterweight, and compares the filtered speed to the threshold speed to determine whether an over-speed condition has been reached. The controlleractivates a machine room brake when an over-speed condition exists, and engages an elevator safetyA,B when it determines that the elevator mass is still in an over-speed condition after the machine room brake has been activated.

Over-acceleration and over-speed detection and processing system

An electromagnetic safety triggerincludes a linkkinematically connected to a safetyA,B of an elevator system mass, such as an elevator car or counterweight. An electromagnetmounted on a linear actuatoris magnetically coupled to the link, and a springis connected between the linkand the elevator mass. The electromagnetcan be triggered to release the link, which allows the springto move the linkto engage the safetyA,B.

Growing community of inventors

Tampa, FL, United States of America

Jose M Carballo