| 摘要 |
A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The check mechanism includes an idler arm assembly attached to a door hanger with an idler roller attached to the idler arm assembly. The check mechanism further includes a pivotable spring biased lever arm having two inclined ramp sections. As the door slides, the idler roller contacts the lever arm. The inclination of the ramp causes an increasing retardation force to be applied to the idler roller, thereby retarding the speed of the door. After the idler roller passes a point of maximum retarding force, the door becomes free wheeling until a second idler roller contacts the lever arm of a second checking mechanism which in turn slows the speed of the door. |
