| 摘要 |
PROBLEM TO BE SOLVED: To provide a door hinge allowing a rotated door to positively return to the original angle without moving in a vertical direction. SOLUTION: This door hinge is provided with a first constitutive part 11 fitted to a door support body, and a second constitutive-part 13 fitted to the door. The second constitutive part is rotatable relative to the first constitutive part but out of advance/retreat. An operating shaft 21 is supported to the first constitutive part irrotationally but in a freely advancing/retreating manner. One end 21a of the operating shaft is placed to face the inside of the second constitutive part, and an external screw 27 is provided at one end of the operating shaft. An internal screw 29 corresponding to the external screw is provided inside the second constitutive part, and the external screw of the operating shaft is screwed with the internal screw of the second constitutive part. Further, an elastic body 31 exerting the force of moving the operating shaft from the second constitutive part toward the first constitutive part is disposed between the other end 21b of the operating shaft and the first constitutive part.
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