| 摘要 |
A device for a vertically displaceable installation support comprising a profile such as a pole, having an internal passage for electric conductors and for carriage entrainment means; a slide rail fixed alongside the profile; a pole head fixed with adjusting means relative to the slide rail at the top of the profile; a movable carriage; a mobile locking, stabilizing and unlocking system fixed to the carriage and corresponding stationary parts on the pole head; electric connections comprising male elements on the carriage and female ones on the pole head; a position and operation monitoring flag on the pole head, and a support for the installation such as a lighting bar. The carriage is slidingly mounted on the slide rail. A spring operated emergency brake may be fitted on the carriage to slow it down and lock it on the slide rail should the entrainment means break or unduly loosen.
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