| 摘要 |
Apparatus is disclosed for releaseably and mechanically attaching an electric-motor-driven device (22), such as a ceiling fan, to an overhead support, such as a ceiling (10). The apparatus comprises a generally vertically disposed downrod (24) having an upper portion (25), a lower portion (46) and a wall (37) defining a hollow interior (36) extending longitudinally therethrough, with the downrod adapted to be non-rotatably secured at the upper end of the upper portion to the overhead support; first electrical contacts (52, 52') preferably recessed in the end of the lower portion of the downrod; a hub (68) on the top of the device; one of the lower portion of the downrod or the hub having a recess to enclose the other in a mating connection; second electrical contacts (76, 76') in the recess aligned with the first electrical contacts and forming a mating connection therewith when the lower portion of the downrod and the hub are connected; a locking pin (54) to releasably secure the hub and the lower portion of the downrod in rigid and non-rotation connection when the one is enclosed in the recess in the other; a first electrical conductor (38, 38') passing through the hollow interior of the downrod to the first electrical contacts and electrically connecting the first electrical contacts to a source of electrical current; and a second electrical conductor (84, 84') electrically connecting the second electrical contacts to the electric motor (21).
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