Patent ID: 7581290

Claim:
A hinge structure, comprising a pivot having a linking portion disposed with a circular shaft axially and a smaller axle extending from a center of a front end of the circular shaft; a main frame having a connection portion which is formed axially to have a tube spring below for the insertion of the circular shaft, the tube spring being positioned to have a gap with the connection portion and a first end of a wall of the tube spring being formed to have an notch; a cam member having a rotation part and fixed part, the rotation part has a protruded portion and the fixed part has an indented portion, the protruded portion and the indented portion are located between the rotation part and the fixed part, the rotation part and the fixed part are installed inside the tube spring for the insertion of the smaller axle, the rotation part being axially disposed with a protruded tenon, which is connected with the notch of the tube spring, and the fixed part being secured with the smaller axle; and at least one resilient member insertingly connected with the smaller axle and secured with a connection segment of the smaller axle by an end enclosure, which presses and constrains the cam member and the at least one resilient member.