| 摘要 |
A multiple lamp shade system for a light bulb in which one of the lamp shades is rotatable and powered by heat given off by the light bulb. A multiply apertured base is held against a light bulb socket by surface contact with the light bulb. A light transmissible stationary inner lamp shade is attached at one end to the base. The other end of the inner lamp shade is partially occluded by a thrust plate on which is located an axially positioned upstanding pointed member. A peripheral annular gap is provided between the wall of the inner lamp shade and the thrust plate. A light transmissible rotatable lamp shade is co-axially mounted over the inner lamp shade and is bearingly supported via a bearing plate, at one end on the upstanding pointed member. A plurality of air vent chutes are annularly arranged adjacent the bearing plate. In operation, the light bulb heats the air within the lamp shades, causing an air convection current which upwells within the lamp shades. The air convection current inside the inner lamp shade is throttled through the annular gap, causing its flow rate to speed up considerably. The air convention current then enters the air vent chutes and exits therefrom in a substantially horizontal direction to cause the outer lamp shade to rotate as a reaction thereto.
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