US Patent 9328545 Blind hinge structure used for furniture

A blind hinge structure used for furniture, comprising a movable cup holder provided on the furniture door body, an adjusting base provided on the furniture body, a rotary arm connected between the movable cup holder and the adjusting base as well as an elastic element designed to generate opening/closing acting force on the movable cup holder; wherein the adjusting base is designed to realize three-dimensional or two-dimensional adjustment to the hinge; a convex step used to support the elastic member is integrally formed on the bottom wall of the movable cup holder; the elastic member is a torsion spring, with its section on at least one of its end parts being square or circular. The present utility model enables the structure among the rotary arm, the adjusting base and the adjusting components to have higher firmness and even compact assembly, improves strength and extends the service life.