| 摘要 |
An apparatus is provided which facilitates the controlled rotative positioning of a suspended planter. The apparatus is comprised of a cylindrical outer member and an internal member in sliding engagement with said outer member and coaxially positioned therewith. The internal member is provided with two spaced arrays of teeth so arranged that, when one member is upwardly displaced with respect to the other member, bearing means associated with said outer member induce rotative motion of one of said members. Restoring means acting between said members causes said upward displacement when downward force is removed therefrom. Attachment means associated with each member facilitates suspension of the apparatus from an overhead support and suspension of a planter from that member which undergoes rotative motion.
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