| 摘要 |
A door hinge fitted to the upper end part of a door enabling the easy and safe mounting and dismounting of the door on and from a door frame. A pivot (20) is stored in a tubular guide member (70), and a pivot drive means (80) is installed adjacent to the side part of the guide member. The pivot drive means comprises first and second shaft members (100, 110) having cross screwdriver tip engagement grooves (140, 150) formed in the end faces thereof, a link (160) fixed to the first shaft member and connected to a pin (180) at the lower end part of the pivot, a ratchet mechanism formed of a ratchet wheel (220) rotating together with the first shaft member and a claw member (230) rotating together with the second shaft member, a torsion coil spring (200) energizing a pivot pin through the link (160) to the pivot receiver (40) of a building side member (30) by energizing the first shaft member clockwise, and a torsion coil spring (250) energizing the claw member (230) to engage with the ratchet wheel by energizing the second shaft member counterclockwise. |
