Patent ID: 8251431

Claim:
An opening and closing device for an automobile trunk lid, comprising: a trunk lid mounted so as to be opened and closed freely on a trunk compartment and having a mechanism for locking the opening of the trunk lid when the trunk compartment is closed, the truck compartment being mounted in a vehicle body; a hinge arm, the hinge arm having one end and having another end, the one end fixed to the trunk lid and the other end turnably attached to the side of vehicle body panel; a hinge link, the hinge link having one end and having another end, the one end turnably attached to an intermediate portion of the hinge arm; a torsion bar that imparts a torsional torque to the other end of the hinge link, the torsional torque imparting a restoring force in the open direction to the trunk lid; and an elastic springing means mounted in the hinge link, the elastic springing means being elastically deformed when the trunk lid is locked and holding the trunk lid in a popped-up state by means of a restoring force when the trunk lid is unlocked, wherein a pop-up spring is used as the elastic springing means, the pop-up spring having a reversing part reversed by folding an intermediate portion, a supporting part attached to the side of the hinge link at one end part thereof, and an arcuate curved part at the other end part thereof; and wherein the opening and closing device is configured so that when the trunk lid is locked, the reversing part of the pop-up spring is brought into contact with the hinge arm and is elastically deformed, and when the trunk lid is unlocked, the trunk lid is held in a popped-up state by the restoring force of the pop-up spring together with the restoring force of the torsion bar, and is also configured so that when the trunk lid is fully opened, the reversing part of the pop-up spring is located in a region held between the hinge arm and the hinge link, and the reversing part of the pop-up spring comes into contact with the hinge arm and the hinge link, whereby an elastic force is imparted to between the hinge arm and the hinge link.