When the traditional electric fan moves up and down, it will be affected by gravity. When it falls, it will quickly drop to the bottom point, and when it rises, it will be very heavy, which will greatly affect the user experience.
The constant force spring is a kind of strip that can be stretched, retracted automatically and maintains a constant force.
When the weight and size are matched and designed, the constant force spring will not make the fan drop rapidly when it is pulled down; it will not be too difficult to pulled up. The constant force spring can make the fan go up and down more easily; The fan can be easily moved up and down by hand. It can be positioned at will, and the time can be used more freely.
Compared with the traditional manual adjustment, it is easier to use and more convenient to operate after adding a mainspring.
More info：https://www.qianyespring.com/
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