Patent ID: 8291549

Claim:
A hinge, comprising: a pivot shaft comprising an engaging portion, a cross-section of the engaging portion being bounded by at least one curved surface and at least one non-rotatable surface; a first bracket non-rotatably sleeved on the pivot shaft; a second bracket rotatably sleeved on the pivot shaft; a cam non-rotatably sleeved on the engaging portion of the pivot shaft and defines a noncircular hole according to a cross-section of the engaging portion, the noncircular hole bound by at least one first contact surface and at least one second contact surface; a cam follower rotatably sleeved on the engaging portion of the pivot shaft and resisting the cam, the cam follower being fixed to the second bracket; and a resilient assembly rotatably sleeved on the pivot shaft and resisting the cam toward the cam follower; wherein the at least one second contact surface is tangent to the at least one curved surface of the engaging portion of the pivot shaft; one of the cam and the cam follower defines at least one cutout and the other one of the cam and the cam follower forms at least one peak engaging with the at least one cutout.