coil cords - cable geometry and performance

Whether you call it a coil line, a coil line, or a retraction line, we see the Helix used in many applications.
From garage doors to mobile phone chargers to medical devices, these cables are critical to achieving many design goals.
Regardless of the design objectives, the main reason for using this solution is to put a large number of cables or wires into confined space and extend if necessary.
Coil wires are a good way to achieve this.
All coil lines have the same general shape, a straight part, then a spiral or curled part, and then another straight part.
The extension capability of the coil line comes from the coil or the curled part.
When the wire is pulled, the spiral part is stretched like a spring.
For many applications, it is critical to retract the time required from its entire length of work.
There are many factors that affect the retraction speed of the coil line, but an important consideration is the geometry of the original cable.
This geometry is a typical circle, but in particular, it can be rectangular or even Oval.
The advantages of each shape and the corresponding \"bean effect\" are discussed below.
Each coil wire needs strength to extend it.
This force comes from the expansion of the coil itself, and also from the bending of the original cable along its length.
If from the perspective of a single coil, what is happening is best described as a beam bending.
In circular geometry, the force required for any given direction is equal.
Using metal hangers is a simple way to visualize.
If the straight section is kept tight at one end, while the other side is pushed from the side, pushing from the side, the force required to bend it in any direction will be very similar.
While other factors, such as manufacturing stress, molecular orientation, or particles, do have an effect to some extent, this effect is very small in this application.
This design creates a product with a typical retraction speed.
In order to achieve a faster retraction speed, rectangular cables should be used.
The rectangular shape increases the force that can be best visualized using a ruler or a normal 2x4 board.
When these things are placed flat with things that support both ends, the middle can be bent freely, and it can be easily bent depending on the length.
However, if the directions change and the directions are placed on the edges, they do not bend at all.
When making a disc winding using a cable with a rectangular crossover
This bending resistance or \"beam effect\" enhances the spring effect of the coil and creates a higher rate of shrinkage.
Sometimes the circular geometry is too slow and the rectangular geometry is too fast.
In these cases, cables with oval geometry can be used.
Since this cable is not circular, it has a higher beam effect, but the beam effect will be smaller because the cable is not completely rectangular.
As you can imagine, there are many changes between the circle and the rectangle.
When designing custom coil lines to maximize retraction speed, many design opportunities are presented with all options.