A PROJECTOR LIFTING DEVICE FOR A CEILING
(19)AUSTRALIAN PATENT OFFICE (54) Title A PROJECTOR LIFTING DEVICE FOR A CEILING (51)6 International Patent Classification(s) G03B 021/54 E04B 009/00 (21) Application No: 2003275752 (22) Application Date: 2003.10.29 (87) WIPONo: WO04/046810 (30) Priority Data (31) Number (32) Date 0203406-4 2002.11.19 (33) Country SE (43) Publication Date : 2004.06.15 (43) Publication Journal Date : 2004.07.15 (71) Applicant(s) OVERHEADPRODUKTER AB (72) Inventor(s) HAMMARGREN, Lars (H) Application NoAU2003275752 A1(19)AUSTRALIAN PATENT OFFICE (54) Title A PROJECTOR LIFTING DEVICE FOR A CEILING (51)6 International Patent Classification(s) G03B 021/54 E04B 009/00 (21) Application No: 2003275752 (22) Application Date: 2003.10.29 (87) WIPONo: WO04/046810 (30) Priority Data (31) Number (32) Date 0203406-4 2002.11.19 (33) Country SE (43) Publication Date : 2004.06.15 (43) Publication Journal Date : 2004.07.15 (71) Applicant(s) OVERHEADPRODUKTER AB (72) Inventor(s) HAMMARGREN, Lars 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). A projection lifting device for a ceiling structure, said ceiling structure comprising a framework (3) suspended from a load-bearing ceiling structure (2) and a plurality of ceiling panels (4) which are supported at the edges by supporting flanges on the framework, in order to cover corresponding openings in the framework, the device comprising a lifting device (10, 20, 21) being carried by the load-bearing ceiling structure (2) and comprising a support element (21) for a projector vertically displaceable, wherein the support element (21) can be moved by the lifting device through an opening in the framework between a lowered position below the ceiling panels (4) and a raised position in which a ceiling panel (4') of said plurality, cooperating with the lifting device covers a corresponding opening of the framework, the ceiling panel having edges that overlap the edges of the framework, characterised in that the ceiling panel (4') is pre-stressed upwardly towards a closed position covering said corresponding opening in the framework by pre-stressing springs (60), and in that the support element (21) of the lifting device, upon lowering, is arranged to move the ceiling panel (4') against the action of the pre-stressing springs (60). A device as claimed in claim 1, characterised in that, on its upper side the ceiling panel (4') has an edge element to screen off the gap appearing between the ceiling and the opening edge when the ceiling panel is lowered, at least along the rear part of the panel in projection direction. A device as claimed in claim 1 or claim 2, characterised in that the rear edge of the ceiling panel (4) is connected to the edge of the opening via a first hinge (44) and in that the ceiling panel (4) has a second hinge (50) that is parallel with the first hinge (44) and articulately joins two rectangular sections (14', 14) of the ceiling panel (4'), wherein the length of the first section (14'), situated between the hinges (44, 50), is greater than the vertical displacement of the ceiling panel (4') and wherein the surface of support element (21) of the lifting device presses against the other section (14) of the ceiling panel (4) in order to keep this substantially parallel to the plane of the ceiling structure when the ceiling panel (4') in open state, and in that the first section of the ceiling panel forms a screening edge between the second part (14) of the ceiling panel and the ceiling structure. A device as claimed in any one of claims 1-3, characterised in that the ceiling panel is provided with screening edges (42) along its side edges. A device as claimed in claim 4, characterised in that the ceiling panel is provided with a screening edge along the front edge of the ceiling panel (4'), the front screening edge having an opening for the beam path of the projector.