Abstract: Disclosed is an opening/closing of a mobile terminal, which comprises: a housing having a polygonal section and being non-rotatably inserted into a hinge of a cover constituting the mobile terminal; elastic means inserted into the housing; a rotary cam shaft provided at one end with an insertion shaft which is inserted into the elastic means in a close contacting manner and non-rotatably contained within the housing, and at the other end with opposed cam faces, each of the cam faces being unintermittently constituted of an escarpment a, a top b and an inclination c; a shaft penetrating the rotary cam shaft, the elastic means and the housing in sequence, the shaft being provided at one end with a stepped recess into which a snap ring is fastened to prevent the shaft from being released from the housing.

Abstract: Disclosed is an opening/closing device of a mobile terminal, which comprises: a housing 20 having a polygonal section and being non-rotatably inserted into a hinge 7 of a cover 6 constituting the mobile terminal 1; elastic means 30 inserted into the housing 20; a rotary cam shaft 40 provided at one end with an insertion shaft 41 which is inserted into the elastic means 30 in a close contacting manner and non-rotatably contained within the housing 20, and at the other end with opposed cam faces 42, each of the cam faces 42 being unintermittently constituted of an escarpment a, a top b and an inclination c; a shaft 50 penetrating the rotary cam shaft 40, the elastic means 30 and the housing 20 in sequence, the shaft 50 being provided at one end with a stepped recess 54 into which a snap ring 23 is fastened to prevent the shaft from being released from the housing 20, and at the other end with a hinge piece 51 fixedly inserted into a hinge 3 of a body of the mobile terminal 1; and a follower protrusion 53 projec