Tilt-preventing fan

Abstract

The present invention provides a tilt-preventing fan having a blade device, a motor, a magnet device, a frame and a ball bearing. The blade device has a blade shaft. The blade shaft has an outer surface and a ring attached the outer surface. The motor is mounted around the blade shaft. The magnet device is mounted around the motor. The frame has a receiving device mounted in the central hole of the motor from the second opening and has an inner flange positioned around the blade shaft. The receiving device has a base, a resilient member and an abrasion-resistant pad abutting the blade shaft. The resilient member is mounted between the base and the abrasion-resistant pad. The ball bearing is mounted between the ring and inner flange. The ball bearing is firmly held between the ring and inner flange and capable of preventing the blade shaft from tilting.

1 . A tilt-preventing fan comprising
 a blade device comprising
 a blade shaft comprising
 an outer surface; 
 a first end; 
 a second end; and 
 a ring formed on the outer surface between the first end and second end; and 
 
 multiple blades radially mounted between the first end and the ring or radially mounted to the first end; 
   a motor for rotating the blade shaft mounted around the blade shaft and comprising
 a central hole receiving the blade shaft and comprising
 an inner surface; 
 a first opening; and 
 a second opening; 
 
 a magnet device providing the motor a magnetic field and mounted around the motor; 
 a frame holding the blade device, the motor and the magnet device and comprising
 a receiving device mounted into the central hole of the motor from the second opening and comprising
 a base comprising a first surface; 
 a resilient member attached to the first surface of the base and comprising 
  a first end; and 
  a second end attached to the first surface of the base; and 
 an abrasion-resistant pad attached to the first end of the resilient member and abutting to the second end of the blade shaft; and 
 
 an inner flange positioned around the blade shaft between the blades and the ring; and 
 
 a ball bearing holding the blade shaft and mounted between the ring and inner flange and comprising
 an annular outer rail pushed by the inner flange towards the ring and comprising
 a semicircular outer groove comprising 
  a first outer portion; and 
  a second outer portion; 
 
 an annular inner rail pushed by the ring towards the inner flange and comprising
 a semicircular inner groove comprising 
  a first inner portion; and 
  a second inner portion; and 
 
 multiple balls movably mounted between the outer groove of the outer rail and the inner groove of the inner rail. 
 
   
     
     
         2 . The tilt-preventing fan as claimed in  claim 1 , wherein
 the blade shaft further comprises an annular slot formed on the outer surface between the first end and second end of the blade shaft; and   the ring is mounted around the annular slot.   
     
     
         3 . The tilt-preventing fan as claimed in  claim 3 , wherein
 the receiving device further comprises an adapter mounted between the abrasion-resistant pad and the first end of the resilient member.   
     
     
         4 . The tilt-preventing fan as claimed in  claim 4 , wherein
 the receiving device further comprises an annular pad mounted between the adapter and the outer rail of the ball bearing.   
     
     
         5 . The tilt-preventing fan as claimed in  claim 1 , wherein
 the inner flange is attached to the inner surface of the central hole between the first opening and the second opening of the central hole.   
     
     
         6 . The tilt-preventing fan as claimed in  claim 1 , wherein
 the frame further comprises
 a tube comprising
 an inner surface; 
 a first opening and 
 a second opening attached to the base; and 
 
 the inner flange is attached to the inner surface of the tube between the first opening and the second opening of the tube. 
   
     
     
         7 . The tilt-preventing fan as claimed in  claim 1 , wherein
 the resilient member is a spring.   
     
     
         8 . The tilt-preventing fan as claimed in  claim 1 , wherein
 the resilient member is a resilient ring.