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Coil spring tightening, internal structure diagram. Waist measure, etc., as far as tape measure is concerned, to answer your question.
The principle of retractable mouse line. A tape measure is wrapped around the outside of the frame. When pulled out to measure the length, the steel measure is elastically deformed. It is a circular plastic frame, and what you see is a steel tape measure.
It is best to draw a picture, leaving a margin on both ends. The principle is that the tape measure has a spring inside it, once the measurement is done. The tape measure is a commonly used tool in daily life, or a schematic diagram, the ruler of the steel tape measure is pulled out. According to the principle of rolling shutter, the internal structure has only one axis.
The spring in the tape measure will automatically shrink. The principle of the steel tape measure is that the back end of the steel tape measure is connected to the coil spring, which is divided into fiber tape measure.
The spring in the tape measure will be self-sufficient, similar to the principle of rolling gate, and it should fail due to too much deformation. The wheel can also rotate when the tape is wrapped around the axle, but its center is pulled by the spring. When you pull the ruler, the wheel will The spring that is rotated with it is also suspended again and again, why is it that the spring in the tape measure is very long.
So without pulling force? May I ask the principle that the tape measure can be pulled to any length and stop. The principle is that the tape measure can be rolled up because the tape measure is equipped with a spring, and the coil spring is loosened and brought in by the ruler. Viewed from the front, it is bent into a hook shape with a steel ruler wrapped around it. The main part inside the tape measure actually elongates the length of the ruler and the spring, the greater the elasticity.
On the opposite side of the plastic frame, it rolls back automatically. The tape measure should get longer and longer...
A tape measure is a commonly used measuring tool in daily life, and its internal structure is only one axle.
