Helical Extension Springs
These springs are typically made from round wire and are closed coil wound, however, various cross-section material may be utilized. Helical extension springs store energy and are used to counteract a pulling force of a mechanism. These types of springs usually have loop ends, but extension springs can have various hook configurations based on the design requirement. Most helical extension springs are coiled with initial tension, this is the force required to separate the adjacent coils. Common applications of extension springs include farm equipment, automotive mechanisms, trampolines, and many other applications.
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Extension Spring Design
Below are some of the parameters for the body of the extension spring that are similar to those of compression springs.