Patent ID: 8939262
Filing Date: 2015-01-27
Classification: B66B

Abstract:
1. An elevator safety system comprising: a speed detector configured to sense a speed of an elevator system mass; an acceleration detector configured to sense an acceleration of the mass; a mechanical safety configured to be connected to the mass; an electromagnetic trigger connected to the safety; and a controller configured to release the trigger to engage the mechanical safety when (a) the speed detector senses an over-speed condition or (b) acceleration detector senses an over-acceleration condition for the mass, and to automatically reset the trigger; wherein the trigger comprises a link to the mechanical safety, an actuator, and an electromagnet, wherein resetting the trigger includes activating the actuator to impart linear motion to the electromagnet in a first direction to bring the electromagnet in contact with the link and then activating the actuator to impart linear motion to the electromagnet in a second direction opposite the first direction to reset the trigger.