Electric fan for outdoor use

Abstract

An electric fan includes a base, a drive unit, a fan blade, and a direct current power source. The drive unit is mounted on the base, and includes a direct current fan motor and an electrical socket connected to the fan motor. The fan blade is coupled to and is driven rotatably by the fan motor. The direct current power source is coupled electrically to the fan motor, and includes a storage battery and an electrical plug connected to the storage battery. When the electrical socket and the electrical plug are interconnected, the storage battery provides power to the fan motor for operation of the electric fan.

I claim:  
     
         1 . An electric fan comprising: 
 a base;    a drive unit mounted on said base and including a direct current fan motor;    a fan blade coupled to and driven rotatably by said fan motor; and    a direct current power source coupled electrically to said fan motor.    
     
     
         2 . The electric fan as claimed in  claim 1 , wherein said drive unit further includes a speed control unit coupled electrically to said fan motor and having a control knob that is manually operable so as to adjust output speed of said fan motor.  
     
     
         3 . The electric fan as claimed in  claim 1 , wherein said drive unit further includes a first cable connected electrically to said fan motor and terminated by an electrical socket, and said power source includes a second cable terminated by an electrical plug that is connected removably to said electrical socket.  
     
     
         4 . The electric fan as claimed in  claim 3 , wherein said power source further includes a storage battery connected electrically to said second cable.  
     
     
         5 . The electric fan as claimed in  claim 1 , wherein said power source includes a storage battery.