FRONTAGE WIDENING TYPE HINGE

PROBLEM TO BE SOLVED: To minimize the thickness dimension of a door projected to a frontage. SOLUTION: Hinges 1 and 2 are provided respectively with first and second stationary blades 11, 21 attached to a frame 100, first and second rotary blades 12, 22 attached to a door 200, first and second intermediate blades 13, 23 located between the first and second stationary blades 11, 23 and the first and second rotary blades 12, 22, first and second frame side shafts 14, 24 rotatably coupling between the first and second stationary blades and the first and second intermediate blades, and first and second door side shafts 15, 25 coupling between the first and second intermediate blades 13, 23 and the first and second rotary blades 12, 22. With this arrangement, when the door is opened, the first and second door side shafts 15, 25 are turned along predetermined loci having centers aligned with the centers O1 , O2 of the frame side shafts 14, 24 through the intermediary of the rotary blades 12, 22 so that the door is turned by an angle of 90 deg., and accordingly, the door is fully opened along a wall surface, thereby it is possible to minimize the thicknesswise dimension of the door projected into the frontage.