Patent ID: 7299525

Claim:
A self-locked hinge device, comprising: a hinge body having a first end and a second end; a first mounting plate hinged to the first end; a second mounting plate hinged to the second end; and a locking mechanism, driven by the second mounting plate when the second mounting plate is moved, for incapacitating the first mounting plate from moving relatively to the hinge body when the second mounting plate is rotated to a predetermined position relative to the hinge body, wherein; a first hinge shaft between the first mounting plate and the hinge body and a second hinge shaft between the second mounting plate and the hinge body are located on the same plane; the locking mechanism comprises: a follower link, which moves with a relative rotation between the second mounting plate and the hinge body, for selectively fixing the first hinge shaft; and a cam, which is mounted to the second mounting plate, for contacting and moving the follower link; the cam is a form-closed cam; and the follower link is formed with a first opening and a second opening in communication with the first opening, and the first hinge shaft is capable of rotating in the first opening but incapable of rotating in the second opening.