We all know that, the elongation (or shrinkage) of the spring is proportional with the external force within the elastic limit. The special springs of this nature is made of spring balance.
Second, the pressed function of spring
If we observe a variety of electrical switches, we will find there must be a spring at one end of the spring, to ensure two switches contact closely, and the two switches succeed in close contact, conduction. If the contact is poor, the contact resistance will be larger, the heat generated when current is passed through becomes large, which may also cause the melt in the metal of the contact. There is a long spring in the stapler, and its role is on the one hand to tight the staples, on the other hand is when the top of the nail was launched, the next nail can be sent to the front to prepare for nailing and In this way, it can automatically pushes a nail to the front, until all the nails are launched. Many machine feed automatically, the automatic loading of the bullets in the automatic rifle depends on this function of wire spring. In addition, the spring in the clothes clip, ballpoint pen and pen clip sleeve are all for the tight pressing in the clothes.
Third, the reset function of the spring
The spring is deformed by the external force, and the spring will be able to restore the state after removing the external force. A lot of tools and equipment are reset by using the nature of spring. For example, many of the hinge of the door of the building are installed the return spring, the door will automatically reset. People also take advantage of this feature to produce automatic umbrella, pencil and other supplies, which is very convenient. In addition, a variety of buttons and keys can leave with the return spring.
Fourth, the spring's driven function
Mechanical clocks, clockwork toys are relying on the on tight winding drive. When the mainspring is tightened then it will produce a bending deformation, and store some elastic potential energy. After release, the elastic potential energy is converted to kinetic energy to rotate driven by the transmission means.
Buffer of the spring
Spring is mounted between the frame and wheels of locomotive car, the elasticity of the spring is used to slow the vehicle bumps.
Sixth, vibrating vocal function
When the air flow from the spring hole harmonica and accordion, and impacting the reed, and the sound will be produced by the vibration of reed.
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