Safety arrangement for lifting device, has sensor unit to acquire relative motion of functional part of lift unit, where sensor unit activates support body to be in safeguard position when relative motion exceeds desired speed level

摘要

The arrangement has a sensor unit (108) for acquiring a relative motion of a functional part (102) of a lift unit. The sensor unit cooperates with a movable support body (107) to automatically activate the support unit to take place in a safeguard position when the relative motion exceeds a desired speed level. The sensor unit is provided with a transducer as signal generator, whose signal is used for controlling the support body.