US Patent 7299525 Self-locked hinge device

A self-locked hinge device includes a hinge body, a first mounting plate, a second mounting plate and a locking mechanism, The first mounting plate is hinged to a first end of the hinge body, and the second mounting plate is hinged to a second end of the hinge body. The locking mechanism is driven by the second mounting plate when the second mounting plate is moved and incapacitates 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. A multi-function peripheral using the self-locked hinge device is also provided.