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Extension springs are very important parts of modern machinery and appliances. They are used in the interiors and exteriors of automobiles, vise-grip pliers, trampolines, farm machinery, toys and countless other devices. They are attached at both ends of both ends of other components so that when the two ends are moved apart, the spring tries to bring them together. Their main functions are to oppose tension, absorb and store energy, and provide a return force. Many machines we use in everyday life wouldn't exist without extension springs.

What is an extension spring?

An extension spring is a tightly coiled spring designed to resist a tensile force. When pulled outward, the spring resists the force and tries to pull back into the coil. The more it is pulled outward, the more the resistance it offers. Extension springs come in several designs. Some of the most common designs include ends with straight-cut loop, hook, and double-twisted full. The main body is a tightly would coil of varying length and diameter. The exact shape and size of a spring depends upon its application.

What are the different designs?

While most extension springs, such Lee Spring’s stock extension spring, have similar design, the drawbar extension spring has a very different design. It has two elongated steel loops that are pushed through a normal compression spring. (A compression spring is the opposite of extension spring). The effect of this design is a loop on each side, which draws the compression spring together when pulled. This drawbar extension spring is stronger than other types of extension springs and has many industrial uses.

What are the dimensions?

The dimensions of an extension string that are used to measure its strength are free length, body length, extended length, loop length, hook length, maximum load, gap, initial tension and active coils. Extended length is the length when of the spring when it is fully extended. Initial tension is the resistance that the spring offers when it is pulled. The tighter the coils, the higher will be the initial tension. Maximum load is the load that the spring can bear.

What are they made from?

A wide range of materials can be used to make extension springs. These include stainless steel, titanium, silicon and chrome. In fact, any strong and ductile material can be used. Also, the material must be resistant to rust because extension springs are usually meant for long-term use. Regardless of whether they are made of industrial, commercial or home use, they are made to last many years.

What are their applications?

As stated above, extension springs have countless applications. If you look around, you will see them everywhere. You can see them in the interior and exterior of your car. For example, the mechanism that opens and shuts your car’s doors is an extension spring. The toy gun that your child plays with usually has an extension spring. Garage door assemblies have extension springs. Rocking horses have extension springs and screen doors have extension screen. In fact, any device that needs an automatic ‘inward-pull force’ when we pull it outward has extension springs.

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