| 摘要 |
A remote control, ceiling mounted lifting device is provided for concealing, supporting and providing floor level access to audio visual objects such as color video/data projectors. The overall height of the lifting device is extremely shallow to allow the device to be mounted and concealed within the ceiling clearance area. The device has an outer frame with an open inner section. A support carriage is provided which is sized to fit and nest with the open inner section of the support framework. The carriage has an inverted U-shaped structure which allows the projector to be recessed upwardly within the confines of the carriage. A scissor-like stabilizer mechanism is mounted on each side of the carriage and support structure. These stabilizer mechanisms are located on the outer edges of the device to minimize the overall height of the device. This double linkage mechanism stabilizes the carriage during movement and use and yet allows the projector to be recessed within the ceiling structure when the carriage is retracted. Cable supports on either side of the carriage are mounted to a motor driven cable drum assembly which is laterally positioned at the top of the support structure. The drum mechanism is positioned to substantially align with the center of gravity of the loaded carriage. An emergency locking brake assembly is provided in conjunction with the cable drum to prevent the carriage from dropping in an emergency situation. A low voltage remote control system which can use infra-red sensors for signal transmission is used for controlling the operation of the lifting device.
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