Patent ID: 7698784

Claim:
A hinge assembly, comprising: a rotational base including a fixing board and a side board disposed at an end of the fixing board, the side board defining an engaging hole in middle portion thereof and forming an inwardly bent portion at a distal end edge thereof; a support member including an extending seat defining a round pivoting hole, and a retaining portion extending from a side of the extending seat, the retaining portion configured for blocking the inwardly bent portion of the side board so that a range of rotation of the rotational base relative to the support member is between a first utmost position and a second utmost position; and a pivot mechanism for rotatably connecting the rotational base to the support member, the pivot mechanism comprising: a torsion spring configured for providing torsion force; a pivotal shaft running through the engaging hole, the torsion spring and the round pivoting hole so as to be non-rotatably connected to the rotational base and rotatably connected to the extending seat; and a fixing piece engaged on the pivotal shaft to prevent the torsion spring from disengaging from the pivotal shaft.