| 摘要 |
PROBLEM TO BE SOLVED: To provide a buffer function attached automatic door closing mechanism and a hinge thereof capable of more smoothly carrying out opening operation of a door on the closing operation while being buffered. SOLUTION: The automatic closing door mechanism is so constituted, that a piston 7 is stored and set in a cylinder 4 provided to one of a pair of vane plates 2 and 3, the approximately lower part of an operating rod 8 fixing the approximately upper part to the other vane plate 3 is set inside of the cylinder 4; spherical bodies 74 and 75 projected on the inside circumference placed to a predetermined position of a piston 7 in a rollable manner are engaged with a cam groove 9 having a slope section 91 formed on the circumference of the approximately lower part of the operating rod 8; the piston 7 moves back and forth in accordance with the movement of the spherical bodies 74 and 75 to the slope section 91 of the cam mechanism 9 and that a hinge 1 buffers impact by an air action effect inside of the cylinder 4 by a returning action of the piston 7, when the door is closed. |
