This section provides an overview for extensionsprings as well as their applications and principles. Also, please take a look at the list of 9 extensionspring manufacturers and their company rankings.
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An extension spring (pull spring) is a coil spring that acts when a force is applied in a tensile direction.
Unlike compression coil springs, the direction in which force is applied is the opposite. Since an extension spring is tightly wound with no gap between the coils, the space required can be reduced.
Unlike compression coil springs, extension springs have hooks at both ends that function as springs when parts are attached to the hooks and force is applied in the pulling direction. The hooks come in various shapes and can be used for different purposes.
Extension springs are used in machinery such as ramps at airfields, and in motorcycle and bicycle stands in everyday life. Since extension springs are often subjected to strong force, the hooks are especially vulnerable to breakage, and many trampolines are made with high-strength hooks. Trampoline stands are covered with extension springs, which allow people to jump high.
Extension springs are the second most commonly used type of spring after compression coil springs. Extension springs deform when a force is applied, and returns to its original shape when the force is removed. This force is also called restoring force. Extension springs have an initial tensile force. Initial tensile force is defined as the internal force of extension springs that is in close contact with the spring when no force is applied to it, and it has the features of saving space by taking advantage of the initial tensile force. The stronger the initial tensile force is, the more space can be saved.
The characteristics of a spring are determined by the spring constant. The larger the value of the spring constant, the smaller the deformation of the spring itself and the stronger the restoring force that tries to return to the original state when a force is applied to the extension springs. If the shape of the hook is round, the force applied is distributed, and the strength is high, but if it is a special shape, the load is applied to one part and it may cause damage, so it is not suitable for machines that are subject to large forces.
*Including some distributors, etc.
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