MANUAL OPERATING DEVICE FOR CRANE

摘要

PROBLEM TO BE SOLVED: To facilitate operability of raising and extending a boom only by performing similar operation to usual operation even under an over-hoisting condition. SOLUTION: This device automatically stops working of a crane toward a dangerous side thereof when a hook is over-hoisted, and provided with a control part to raise the boom as well as to lower the hook when the boom is operated to rise under the over-hoisting condition.