Structure of circulation fan

Abstract

A fan includes a casing that is composed of a front cover and a rear cover, a base mounted under the casing, and blades rotatably mounted in the casing. The base includes support frames symmetrically mounted thereto. The front and rear covers are each composed of a plurality of circular frames of different diameters. The rear cover has a lower portion that forms slots corresponding to the support frames so that the support frames are movably received through the slots respectively. A connection bar is connected to the rear cover so that the casing may undergo vertical and horizontal rotations through the arrangement of the slots for adjusting direction of airstream generated by the fan, thereby realizing an effect of indoor air circulation. Further, due to the arrangement of the rotation structure inside the casing, the outside appearance of the fan shows a sense of completeness of aesthetics.

1 . A fan comprising a casing that is composed of a front cover and a rear cover, a base mounted under the casing and having a top surface comprising support frames symmetrically mounted thereto, the rear cover having a lower portion that forms slots corresponding to the support frames so that the support frames are movably received through the slots respectively, a connection bar connecting between opposite sides of the rear cover and rotatably carrying blades and a motor coupled to the blades, whereby, the casing selectively undergo vertical and horizontal rotations through movement of the slots along the support frames; wherein the fan is operable so that the vertical and horizontal rotations of the casing are selectively performed to adjust direction of airstream generated by the fan to realize an effect of indoor air circulation or an effect of drying clothes and wherein the arrangement of the rotation structure inside the casing, the outside appearance of the fan shows a sense of completeness of aesthetics. 
     
     
         2 . The fan according to  claim 1 , wherein the base comprises a control circuit received therein and the control circuit comprises a temperature detector, which automatically starts operation of the fan when a surrounding temperature rises to a first predetermined level and shuts down the operation of the fan when the surrounding temperature lowers to a second predetermined level. 
     
     
         3 . The fan according to  claim 1 , wherein the front and rear covers of the casing are each composed of a plurality of circular frames of different diameters.