1, winding tape measure

The main part of the tape measure is a round plastic frame. Seen from the front, a tape measure is wound around the frame. On the back and inside of the plastic frame, there are coils of springs. One end of the spring piece is bent into a hook and fixed in a small gap of the plastic frame, and the other end is bent into a ring and fixed in a small gap of the ruler box.

2. Fixed tape measure

There is a hollow column in the middle of the ruler box, and there is a small crack on the column. Put the plastic frame into the ruler box. Align the ring at one end of the spring leaf with the seam of the ruler box and fix it. The spring leaf is easy to fall off. If it falls off, it needs to be rolled up again and stuffed into a plastic frame.

3. Install the small spring. Put the small spring in the hollow column.

4. Stick the plastic frame with small buttons on the ruler box, so that the drawn tape can't be taken back. When installing, buckle it on the small spring, cover it and the tape measure will be installed.

Extended data:

principle

The tape measure can be rolled up because it has a spring. When measuring the length, the length of the ruler and the spring is actually lengthened. Once the measurement is completed, the spring in the tape measure will automatically shrink, and the ruler will also shrink under the action of the spring force, so the tape measure will be rolled up.

Tape measure is a common measuring tool in daily life. What we often see is a steel tape measure, which is often used in construction and decoration, and is also one of the necessary tools for families. Divided into fiber tape measure, tape measure, waist measure and so on. Lu Banchi, Feng Shui ruler and secretary also belong to steel tape measure.