| 摘要 |
<p>A control unit for rotationally driving, in a selected one of rotationally opposite directions, a mechanism for moving a covering for an architectural opening. The covering may be moved between extended and retracted positions. The control unit includes: a housing, a single operating element that enables operation by manually imparting a repetitive linear motion thereto, and a rotational input member for engagement by the single operating element. The input member being journalled with respect to a cylindrical cavity in the housing for rotation between first and second rotational end positions. A return mechanism returns the rotational input member from the second end position back to the first rotational end position. A sun gear is driven by the first rotational element and engages a planet carrier through a plurality of planet gears. A ring gear is engaged by the planet gears can be coupled to the planet carrier for rotation therewith and the planet carrier can be held stationary to cause the ring gear to rotate in an opposite direction to first rotational element. A rotational output member is adapted to be driven by the ring gear or to be kept stationary by a brake mechanism acting between the output member and the housing. A switch ring is operative in translating rotation of the sun gear in rotation of the ring gear in one or the other direction with respect to rotation of the sun gear. The direction of rotation is dictated by selective operation of the single operating element in a first position of angular deflection or in a second position of angular deflection. A covering for an architectural opening including at least one covering that is retractable and extendible by a mechanism for moving the at least one covering member between extended and retracted positions and provided with such a control unit is also disclosed.</p> |
