| 摘要 |
A control and suspension system for a retractable covering mounted on a rotating element includes an apparatus for mechanically limiting over-extensions of the covering and an apparatus for mechanically limiting over-retractions of the covering. The apparatus for limiting over-retraction includes a threaded shaft and an internal, roll-bar-support wheel treaded on the threaded shaft. An intercepting ledge comprising part of the internal, roll-bar-support wheel, and a stopping ledge comprising part of the threaded shaft. Over retraction of the covering is prohibited when the intercepting ledge impacts the stopping ledge. The apparatus for limiting over-extension includes a roll-bar-end support wheel having a down limit stop pivotally mounted thereto. When the covering material is fully extended, the limit stop rotates away from the roll-bar-end support wheel and impacts a substantially annular channel wall associated with an end cap, thereby preventing further rotation of the roll bar and thus further extension of the covering. The control and suspension system also includes an apparatus to compensate for any undesirable skewing of the covering that might occur. The skew adjustment apparatus includes a skew adjustment plate that is slidably mounted in channels on an end cap. A threaded skew adjustment plug is threadingly engaged with the skew adjustment plate such that rotation of the skew adjustment plug moves the skew adjustment plate. Finally, the control and suspension system also includes a bottom rail that attaches to the bottom of the covering by trapping a portion of the covering between a compression plate and a bottom plate.
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