A wing door opening/closing apparatus including a link mechanism and a spring for swinging up a wing door 1. This wing door opening/closing apparatus is made up by plural wing door opening/closing devices A and B. The disparity of the moments generated by ...

A wing opening and closing device stored inside a guard frame (2) in the closed state of a wing (1) supported on the body of a vehicle such as a truck, comprising a first arm (4) supported on the body and moved according to the opening and closing of the w...