| 摘要 |
PROBLEM TO BE SOLVED: To provide a door system having an automatic return hinge accurately returning to the return position of a door set at an arbitrary position. SOLUTION: The folding type door system 1 has a support mechanism 18 and a hinge unit 22. An upper pivot 15 includes an automatic return hinge mechanism having a double angular cam 60, a return spring part 40 and a multi-stage polygonal shaft 48 penetrating and fitted in both the members. The cam 60 includes an upper cam 61 rotating together with a casing 33 rotating upon opening and closing the door, and a lower cam 65 externally fitted to the multi-stage polygonal shaft 48 so as to be vertically movable and incapable of rotating, connected to the upper cam 61 and sliding downward in accordance with the rotation of the upper cam 61. The multi-stage polygonal shaft 48 has a cylindrical head 48a protruding on the upper part of the casing 33 fixed to a shaft adjusting fitting 51 provided in a door frame 11 at an arbitrary rotary position. COPYRIGHT: (C)2004,JPO
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