Patent ID: 7228596

Claim:
A hinge assembly for connecting a door to a main body, the hinge assembly comprising: a shaft having both ends fixable to one side of a door; a pair of fixed cams integrally formed at the shaft and transmitting a rotary force when the shaft is rotated, wherein, with the shaft fixed to the door, the shaft can be rotated by the door; a pair of moving cams linearly reciprocating by contacting with surfaces of the fixed cams, wherein, with the shaft fixed to the door, the fixed cams allow the door to remain in an opened state when the door is opened to at least a predetermined angle and to return the door to a closed state when the door is at an angle less than the predetermined angle; a housing coupled to the moving cams and fixable to a main body; and a spring installed between the moving cams and providing an elastic force.