| 摘要 |
The present invention discloses the novel placement of two pairs of vertical track disposed adjacent to each other together with a pair of radiused horizontal tracks being attached to the outer pair of vertical tracks allowing the use of a flexible lift and reverse cable system to open, close and reverse multi-paneled garage doors. Use of an inner and outer pair of vertical tracks disposed adjacent to each other allows the lowermost rollers to be guided on the inner vertical tracks and the remaining rollers to be guided on the outer vertical tracks and, ultimately, the horizontal tracks as the garage door opens. This configuration allows the lift cable a clear pathway to travel from the drum down the center of the inner vertical tracks to the connection with the shaft journal mounted near the bottom of the garage door. The reverse cable also has a free pathway from its connection to the shaft journal at the lower portion of the garage door, down around the pulley located adjacent to the bottom of the garage door and then upwardly toward the back side of the cable drum and, ultimately, connection with the lift cable to form a continuous loop without interfering with the rollers. This configuration ensures that the lift and reverse cables move simultaneously, thus maintaining the constant tension in the continuous loop of cable necessary to provide the required safety feedback mechanism case an obstruction is encountered during the closing operation.
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