What does the internal structure of the tape measure look like?
The internal structure has only one axle, and the ruler is wound on the outside, and the ruler is wound on the axle. The ruler can also rotate, but its center is pulled by a spring. When you pull the ruler, the wheel will also rotate with it, and the spring will be squeezed again and again. When you loosen it, the spring will pull the wheel back into place, and then the ruler will follow it back.
Tape measure is a commonly used tool in daily life. What you often see is the steel tape measure, which is commonly used in construction and decoration, and is also one of the essential tools for the family. Divided into fiber tape measure, tape measure, waist measurement and so on. Luban ruler, Feng Shui ruler, and Wen Gong ruler are also steel tape measures.