Observing various electrical switches will find that one of the two contacts of the switch must be equipped with a spring to ensure that the two outgoing ends are in close contact and that the conduction is good. If the contact is poor, the resistance at the contact becomes large, and the heat generated when the current passes increases, and in the case of severe, the metal at the contact melts. The two metal posts of the bayonet cap are also equipped with springs for good contact; as for the central metal piece of the screw cap and the plug metal pieces of all the sockets are reeds, the function is to make the two sides close contact to maintain Same as good. In the cassette, there is a phosphor bronze reed that uses the elastic force generated when it is bent and deformed to bring the head into close contact with the tape. There is a long spiral spring in the stapler.
Its function is to tighten the staples on the one hand, and to push the rear nails to the front for the comfort of the nails when the front nails are pushed out. In this way, one nail can be automatically pushed to the front until the nail is fully pushed out. Many machines are automatically fed, and the bullets in the automatic rifle are automatically attached to the spring. In addition, clips like clothes, ballpoint pens, and clips on the pen cover are clipped on the clothes by the spring pressing function.