Patent ID: 7155780

Claim:
A hinge assembly for joining a body and a cover of a foldable electronic device, the hinge assembly comprising: an outer housing being a hollow cylinder for being coupled to the cover; an inner housing within said outer housing, said inner housing having two ends, one end being open, the other end being a head with a setting hole, wherein said head is coupled to the body; a can received in the inner housing, said can having two ends, one end being a protrusion defining a hole, the other end being a cylindrical acceptor; a torsion-bar spring received in said inner housing, said torsion-bar spring having opposite first and second ends, the second end of said torsion-bar spring being secured with said can; a slider comprising a first end having a block and a second end being a cylinder defining a cavity, said block being engaged in the hole of said can, wherein when said slider axially moves, said block is freed from the hole of said can and is able to rotate relative to said can; a securing portion coupled in said cavity of said slider and secured with said outer housing and the first end of said torsion-bar spring; and a key received in said setting hole of said inner housing to press said block of said slider.