Hinge switch a bevel, everyday people used to call it from the mouth, is a section of making processing, but practice often meet because of this section, cause the switch is not flexible and oversized phenomenon to seaming. It if the words is a word: the main points of the switch side of oral confession, the thickness of the fan is the same distance between two edges from the hinge axis, the bevel is correct. Is another way of saying that a hinge axis centre point, the radius is door leaf width of arbitrary point, opposite to the arc, then the intersection curves and two edge into a straight line, is the right bevel line.
In the practical application, every single open door and ask don't hi-lo split in fan, can be directly to do according to the requirement of the above said. But split between fan to hi-lo, which cover do the mouth fan made according to the requirements of oblique mouth first. Such as fan made excessive penetration to adapt to the mouth, again by the created on the basis of fault, is fan is easy to switch to smaller, cover, with open and mutual supporting force small reasonable for fan fault.