The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.

A careless mistake is being blamed for the death of 2 mainland tourists in a crane crash accident in Taipei Friday. Three others were injured, one critically, in the incident.

With structural design of the hoist jib, analysis and calculation are made in such aspects as material, type of the box type section, and the local stability of the web plate.