Patent ID: 7640628

Claim:
A hinge assembly, comprising: a base seat, the base seat including a pivot flange, the pivot flange having a retaining hole formed therein, the pivot flange defining a protrusion therein, the protrusion extending into the retaining hole; a fixing seat including an extending portion, the extending portion defining an engaging hole; a resilient element residing between the base seat and the fixing seat; a pivotal shaft, the pivotal shaft having at least one flat surface, the pivotal shaft being positioned within the retaining hole of the pivot flange, one of the at least one flat surface pivotably engaging with the protrusion; and a plurality of washers; wherein the pivotal shaft extends beyond the retaining hole of the pivot flange and non-rotatably engages in the engaging hole of the fixing seat, the plurality of washers being are fastened together to the pivotal shaft, the washers includes a triplet of first washers, each of the first washers has a latching end, the pivot flange has a locking hole defined at two sides of the retaining hole, the fixing seat has a notch adjacent to one side of the engaging hole, each of two of the latching ends engages in a corresponding locking hole, another latching end engages in the notch.