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extension springs

What is an extension spring?

Extension springs absorb and store energy as well as create a resistance to a pulling force.wrapped to meet various tension needs. These springs are normally attached at both ends to other components and when these components move apart, the spring tries to bring them back together again. It is the initial tension that determines how tightly together the spring is coiled. This initial tension can be manipulated to achieve the load requirements of a particular application. Designs normally have hooks, eyes, or other interface geometry at the ends which attach to the opposing components. They are frequently used to provide a return force to components that extend in an actuated position.

Common Applications of Extension Springs

Find extension springs in a variety of everyday items, from garage doors to tools to washing machines to toys. The variety in size makes extension springs versatile as they are used in small medical devices and off-road machinery. Common applications of extension springs include:
·Car interiors and exteriors
·Garage door assemblies
·Vise-grip pliers
·Carburetors
·Trampolines
·Washing devices
·Farm machinery
·Toys

Common Extension Spring Types and Designs

Extension springs use a variety of hook or loop end configurations to fit specific functions.
Extension spring ends include:

·Machine and Crossover Center Hooks
The two most common types of extension spring ends are machine and crossover center hooks. Machine hooks form directly off the extension spring. Then, they circle over and across the center of the spring end. The bend begins at three-fourths of a coil out. They’re stronger than crossover center hooks because the bend radius is less pronounced.
Crossover center hooks bend across the center and form a circle at the end. With a more pronounced bend radius, the hook is made by lifting the last coil and twisting it toward the middle of the extension spring end. As a result, they cross the center.

·Side and Extended Hooks
Although less popular, side and extended hook ends are useful for extension springs in certain situations. More economical than crossover center hooks, the side hook forms a circle on the same plane as the outside diameter of the extension spring. It’s made by bending the last coil out. As a result, the spring is offset, which is the perfect solution for providing tension that can’t interfere with your connecting component.
An extended hook is similar to a side hook in its use and function. The difference is that the final coil bends with a gap between the end of the wire and the other coils. Because of that, the spring has a shorter body but longer end hook to deliver more force.

·Double Loop and No Hooks
As the name sounds, a double loop end has two coils, and there’s no gap between the end of the wire and other coils. This extra loop provides more strength on the extension spring ends to prevent breakage.
On the other hand, an extension spring with no hooks has an advantage over those with hooks because there’s no fatigue or stress. You use it to thread a bolt into the inner diameter to secure the ends. It’s the most economical of the ends because it has a better life cycle, distance and pulling force.

·Customized Ends for Extension Springs
If one of these extension spring ends doesn’t work for you, you can always customize the ends according to your needs. An expert can help you create the right spring design and end.

Key Design Parameters

Dimensions
Outside Diameter, Inside Diameter, Wire Diameter, Free Length and Exte
nded Length
·The Free Length is the length of a spring in the unloaded position (measured from inside the end loops).
·The Extended Length is the length at full rated extension.
Spring Rate and Maximum Load
·The Spring Rate is the force per unit spring deflection, such as lbs per inch travel.
·The Maximum Load is the load at full rated extension.
·Unit of Measure
· Stock Springs are specified in both Imperial (inch and pound) and Metric units.

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