Patent ID: 7434295

Claim:
A spring hinge using a clutch structure for eyeglasses comprising: a hinge bracket, an end of a linking section of the hinge bracket comprising an axial groove therein, another end of the hinge bracket connecting to a frame or temples, an upper wall and a lower wall of the groove comprising an upper through hole and a lower through hole therein respectively perpendicular to the two walls and a sidewall of the groove being a hinge stop component; an end-meshing element comprising an end with teeth thereon and another flat end, the end with teeth being fixed in the through hole of the hinge bracket; a central-meshing element received in a through hole of a hinge cannula, an end of an inserting end of the central-meshing element comprising meshing-teeth and another end comprising a hole, the central-meshing element comprising a hinge stop component; a hinge cannula, which has a through hole therein, perpendicularly connecting to the temples or frame, the outside of the hinge cannula comprising a stop component to work cooperatively with the hinge bracket; a resilient element received in the hole of the central-meshing element; a fixing element, which presses the bottom of the resilient element, screwing in a screw hole of the hinge bracket or a screw hole of the end-meshing element; and a slide bushing, which is a columnar casing has a stepped through hole inside, a bigger hole of the slide bushing being used to mount a spring and a smaller hole being used to received a long screw, the outside of the columnar casing sliding between the central-meshing element and the through hole of the hinge bracket, and the inside bottom of the smaller hole of the slide bushing pressing the bottom of the spring and the outside bottom pressing the inside surface of the long screw head.