Automatic Twist Lock

grabcad

In this innovative design, the twist lock on a crane/spreader controls the container's bottom twist lock elimination, reducing human intervention. The crane's twist lock needs minor modifications while no changes are required for corner fittings. Top corner fitting features a pump/actuator; when lowered, the crane's twist lock engages it and the modified clamp couples with the pump's arm. As the lock turns 90 degrees, the pump's arm rotates, pumping hydraulic oil into the bottom lock, unhooking it from the container below. When reloading, the bottom lock locks again as the crane is withdrawn. Although complex and potentially impractical, this design concept warrants consideration.