Patent ID: 7124472

Claim:
A hinge mechanism for joining a flip cover to a main body of a foldable mobile phone, comprising: a shaft having an outer screw thread; a rotating cam having an inner screw thread; a driven cam defining two symmetrical latching grooves in an inner wall thereof; a first elastic element; a sleeve including at least one latching block; a second elastic element; an anchoring block defining a first hole and at least one second hole; and a button having at least one post; wherein the shaft extends through the rotating cam, the driven cam, the first elastic element, the sleeve, the second elastic element and the first hole of the anchoring block, the outer screw thread of the shaft engages with the inner screw thread of the rotating cam, opposite ends of the first elastic element respectively abut against the shaft at the outer screw thread thereof and one end of the sleeve at said latching block, opposite ends of the second elastic element respectively abut against the driven cam and the anchoring block, said latching block of the sleeve is slidably received in the latching grooves of the driven cam, and said post of the button extends through said second hole of the anchoring block and abuts against an opposite end of the sleeve.