| 摘要 |
A cable tensioner (20) for a sectional overhead door (D) having a motor-driv en counterbalance system (30) including, a spring-loaded axle (3 1), cable drum s (24) carried by the axle, cables (C) attached to and interconnecting the cab le drums and the door and forming and releasing cable wraps (29) on the cable drums upon raising and lowering of the door, the cable tensioner having, a tension spring (31) adapted to be mounted on the sectional door having a fir st end (34) and a second end (35), the first end being adapted to engage the do or and the second end being adapted to slidingly engage the cable, wherein the tension spring urges the second end to take up any slack in the cable.</SDOA B> |
