Patent ID: 7406747

Claim:
A hinge apparatus to open and close a cover of an image forming apparatus, which pivotably connects the cover to a main body of the image forming apparatus, to expose and cover a document glass, the hinge apparatus comprising: a hinge body movably inserted in a first direction into a coupling hole positioned in the main body of the image forming apparatus, and having supporting brackets; a hinge cam, connected to the cover, and pivotably connected to the supporting brackets; and a pressure device disposed at the hinge body to press the hinge cam; the hinge body is provided with a housing chamber; and the pressure device comprises a pusher disposed in the housing chamber, that protrudes from the housing chamber, and a spring disposed within the housing chamber to press the pusher; the pusher comprises a locking protrusion; the hinge body is provided with a guide slot; and the locking protrusion is inserted into the guide slot, and prevents the release of the pusher from the hinge body; wherein the pusher moves upward and downward within the guide slot.