Semiautomatic spreaders are fixed to the hooks of gantry, bridge and portal cranes.
Twist lock control is carried out mechanically by means of wire rope pulling.
Hooking/unhooking is carried out without help of crane workers.
Simplicity and convenience of spreader installation allow converting from hook crane into container crane in a short time.
There is no necessity to arrange power supply for the spreader and to update the crane control circuit
