| 摘要 |
<p>A hinge pin extends through the overlapping knuckles of a door hinge and has an exposed end portion projecting from one of them. The pin is stationary in one of the knuckles during opening and closing of the hinge. A closing coil spring encircles the projecting end portion of the pin with one end anchored to the pin and the other end anchored in fixed position relative to the other knuckle. The spring is coiled in the direction that will cause it to be wound more tightly during opening of the hinge. An adjustment coil spring tightly encircles the pin inside the knuckle in which the pin is stationary. One end of this spring is free and the other end is anchored to the surrounding knuckle. The adjustment spring is coiled in the direction that will permit the pin to be turned manually in it to wind the closing spring more tightly.</p> |
