Patent ID: 8640307

Claim:
A hinge comprising: a central element formed integratedly, and having a mounting segment, a neck segment and a fastening segment formed axially in sequence, wherein the neck segment and the mounting segment are both circular in cross section, and an outer diameter of the neck segment is smaller than a width of the mounting segment and a width of the fastening segment; and a surrounding element mounted rotatably around the central element, formed integratedly, and having a limit segment mounted around and flush with the neck segment of the central element, wherein two ends of the limit segment respectively abut the mounting segment and the fastening segment of the central element; and a positioning segment formed on one of the two ends of the limit segment, and mounted around and flush with the mounting segment; wherein the mounting segment has multiple positioning protrusions formed on an outside wall of the mounting segment, and arranged annularly; and the positioning segment has multiple positioning recesses formed in an inside wall of the positioning segment, arranged annularly, and selectively engaging with the positioning protrusions.