Patent ID: 9581174
Date: 2017-02-28
CPC Classifications: F04D

Claim:
1. A fan frame capable of accommodating a fan for blowing air or cooling, the fan frame comprising: a tapping screw having a head and a shaft, the head having a maximum diameter; a hole in the fan frame for fixing the tapping screw, wherein the hole includes: wherein the first hole portion is formed to have a diameter larger than that of the second hole portion and continuously reduced in diameter toward the second hole portion, and at least a portion of the first hole portion is curved convexly inward an axis direction toward the second hole portion or curved concavely outward the axis direction toward the second hole portion; wherein the maximum diameter of the first hole portion is smaller than the maximum diameter of the head of the tapping screw, such that the head cannot fully enter the first hole portion; and wherein when the shaft of the tapping screw is fully inserted into the hole the first hole portion defines an air gap around the shaft.