Patent ID: 7568261

Claim:
A hinge assembly, comprising: a base body comprising a housing defining a cavity, the housing being in the form of a barrel, the cavity of the housing having a keyed shape, and an end of the housing defining an end hole smaller in diameter than and in communication with the cavity, an arm extending generally perpendicularly from an outer sidewall of the housing, a distal end of the arm defining a keyed hole; a bracket; a support board; a pivotal mechanism comprising a pivotal shaft fixed to the base body, an elastic member configured for providing axial force along an axis of the pivotal shaft, and a fixing member, the pivotal shaft extending through the bracket, the fixing member fixedly engaged with the pivotal shaft such that the elastic member and part of the bracket is held between the fixing member and the pivotal shaft, the base body being rotatable relative to the bracket around a first axis coinciding with the axis of the pivotal shaft; and a rotational mechanism comprising a rotational shaft, a rotary member, a steady member at least partially received in the cavity of the base body and held therein, and an elastic member received in the cavity of the base body, the rotational shaft extending through the support board, the rotary member, the steady member, the elastic member and the base body, the support board and the rotary member being rotatable in unison relative to a combination of the steady member and the base body around a second axis, each of the rotary member and the steady member defining an engaging surface, the engaging surfaces being movably engaged with each other, one of the engaging surfaces forming at least one peak, and the other of the engaging surfaces defining at least one valley corresponding to the at least one peak.