| 摘要 |
<p>PURPOSE:To stably support even a heary door by actuating a gear line in association with the action of a door to make a turning movement, and a pair of upper and lower arms in synchronous turning movements together with a shaft connecting the arms. CONSTITUTION:A line 8 of gears for associating the turning movement of a door 7 with that of an upper arm 6 are arranged on the side of the upper arm 6. When a turning movement control force exerted in the direction in which the door 7 is opened is applied to the door 7 an externally rotating gear 9 is rotated and an intermittent gear 11 is driven and tends to rotate in the direction opposite to the turning movement of the door 7. But the intermittent gear 11 meshes with also a fixed guide gear member 10 and therefore does not rotate.</p> |
