Extension springs can be tailored for various loads, applications, or specific conditions by adjusting the coil size, wire size, or spring length. Typically made from round wire and close-wound with initial tension, these springs present a challenge for customization. Stock manufacturers can deliver large quantities quickly but may lack the customization needed for specific products or applications. Conversely, small custom manufacturers often struggle with turnaround times and consistent quality.
At Ace Wire Spring & Form Co., Inc., we bridge this gap by offering both specialty and stock springs with the design assistance and customization typical of a small shop, along with the quality and fast delivery of a larger company. Our state-of-the-art technology and in-house design expertise, backed by years of manufacturing experience, enable us to produce both small custom runs and large stock runs of extension springs. This is especially valuable in the custom gun springs industry, where precision and reliability are critical. As a certified member of the National Shooting Sports Foundation (NSSF), we are committed to meeting high-quality and industry standards.
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Extension Springs are springs which absorb and store energy by offering resistance to a pulling force. Typically, extension springs are made from round wire and are close wound with initial tension. Extension applications include tape cassette players, balance scales, garage doors, washing machines and applications which requiring various types of tensioning devices. Various types of ends are used to attach the extension spring to the source of the force.
Most extension springs are wound with initial tension. This is an internal force that holds the coils tightly together. The measure of the initial force and just start coil separation. Unlike a compression spring, which has zero load at zero deflection, an extension spring can have a prelude at zero deflection.
This build-in load, called initial tension, can be varied within limits, decreasing as the spring index increases. There is a range of stress (and, therefore, force) for any spring index that can be held without problems. If the designer needs an extension spring with no initial tension he should design the spring with space between the coils.
Unlike compression springs, extension springs don’t have a solid stop to prevent overloading. Because of this design stress levels are lower for extension springs than for compression. A special type of extension spring is called a Drawbar spring, it has a solid stop and is a type of compression spring with special hooks.
It is important to include specifications for extension springs in both spring design as well as in placing an order for extension springs. The following information is designed to provide assistance with building specifications for extension springs.
Frequency of Extension. Is Position of Ends important? (Making the ends of springs bear a definite relation to each other usually adds to the cost of manufacture.)
Note: Extension springs made from tempered or hard-drawn wires can be and usually are wound with initial tension. Such tension may average 20% of the total safe stress of the springs, but will not increase the elastic limit.
This video shows how Extension Springs are manufactured.
For more information about extension springs or to talk to one of our experts call 1-800-828-3353.
ACE specializes in custom precision springs and wire forms, offering a distinct advantage by utilizing the most advanced spring design software. ACE validates each existing and new design, notifying the customer with our recommendations.
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