Projektorhissanordning för ett innertak

摘要

A projector lifting device for a ceiling structure comprises a projector lift suspended from a load-bearing construction (2) and which can displace a support element (21) carrying a projector (30) down through a rectangular opening in a ceiling structure (1) with ceiling panel (4') that is pre-stressed upwardly towards the ceiling structure by springs (60) so that its edge parts rest against the edges of the opening. The ceiling panel is opening by being displaced by the support element of the projector lifting device against the action of the springs (60) which automatically close the ceiling panel when the lifting device lifts the support element through the opening to above the level of the ceiling (1).