Patent ID: 7814620

Claim:
A hinge applicable to a foldable electronic device, comprising: a hinge assembly adapted for producing and releasing an elastic force by rotating; and a damper assembly connected coaxially with the hinge assembly, the damper assembly including: a stationary housing defining a cavity with an opened end and a wall opposite the opened end, a damper body rotatablely installed in the cavity of the stationary housing, the damper body having a head, a cylindrical guiding portion axially protruding from the head and a pushing portion radially protruding from a portion of an outer periphery of the guiding portion, the pushing portion having two side ends apart from each other, at least one of the two side ends having a step-shaped profile to make the width of the pushing portion between the two side ends nonuniform, an outside surface of an outside step of the step-shaped side end being inclined inwardly from one end thereof away from other steps of the step-shaped side end towards the other end thereof adjacent to the other steps, outside surfaces of the other steps being in the same direction with the axis direction of the damper body, and a plurality of rotatable sheets and a plurality of stationary sheets respectively received in the cavity of the stationary housing and alternately disposed on the guiding portion and the pushing portion, the stationary sheets being fixed to the stationary housing, each of the rotatable sheets protruding inwardly to form a retaining portion, when the elastic force of the hinge assembly is released to drive the damper body to rotate to open the foldable electronic device, one side end of the pushing portion contacting one end of the retaining portions in succession because of change of the width of the pushing portion in order to open the foldable electronic device gently, when the elastic force of the hinge assembly is released to drive the damper body to rotate to close the foldable electronic device, the other side end of the pushing portion contacting the other end of the retaining portions in succession because of change of the width of the pushing portion in order to open the foldable electronic device gently, damper resin being filled between the adjacent stationary sheets and rotatable sheets for restraining the pushing portion rotating.