| 摘要 |
A LIFT IS MOUNTED INTO A HOLLOW CEILING OR THE LIKE FOR A MULTIMEDIA PROJECTOR (5). THE LIFT HAS A FRAME-SHAPED BASE PLATE (10) TO BE FASTENED AT THE ORIGINAL CEILING (1) AND SUPPORTED BY FOUR MAON SHAFTS (12) BEING SYNCHRONOUSLY DRIVEN. A PLATFORM (20) FOR THE RECEPTION OF THE PROJECTOR (5) IS CONNECTED WITH NUTS (22) DRIVING AT THE MAIN SHAFTS (12) UP AND DOWN IN RELATION TO THE BASE PLATE (10). FOR THE ROTATION DRIVING OF THESE MAIN SHAFTS (12), THERE ARE ATTACHED CHAIN-OR GEARWHEELS (13). THE SHAFT BEARINGS (11) AND CHAIN- OR GEARWHEELS (13), EACH ARE NEIGHBOURED ONE ON THE TOP OF THE OTHER, ARE ARRANGED ON THE SIDE OF THE BASE PLATE (10) TURNED AWAY FROM THE ORIGINAL CEILING (1). THE PLATFORM (20) HAS A DEPTH (24,25), WHICH IS DIRECTED TOWARD TO THE BASE PLATE (10) AND HAS A BOTTOM (25) FOR THE RECEPTION OF THE PROJECTOR (5).(FIG 1)
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