In case that a cable installed in a spring balancer is cut or a suspended tool is disengaged, the cable will snap back due to the tension of spring involved in a spring balancer, causing the dangerous situation such as the injury to personnel etc. This new device has developed to protect personnel from such the danger.
Description of the device
As soon as a cable is cut, a drum revolves rapidly winding a cable up.
Rapid revolution of the drum generates centrifugal force. The centrifugal force makes a Ratchet on a spring case pushed out and the ratchet sticks in a wheel fixed on a cover, stopping the revolution of the drum.