BeddyBye wrote:
I would say that almost all mattresses are made with Leggett & Platt coil systems, as well as other components. Sure, there are some like McRoskey who manufacture their own. But, most companies use those made by L&P. And, they also make the pocketed coils for Simmons. The mattress companies won't necessarily show the name Leggett & Platt. You can always ask the mattress salesperson (IF they even know!) Here is something I found online:
"Leggett & Platt makes innersprings for nearly all of the mattress companies, so essentially it is the same coil system in all of them. Leggett &
Platt is a diversified manufacturer that conceives, designs and produces a broad variety of engineered components and
products for customers worldwide. While Leggett & Platt may not be a familiar name to you, chances are you sleep on a bed
made with Leggett components - box spring, innerspring, fiber comfort layers; relax in a recliner that has an L&P motion
mechanism powering it; shop in stores that have products displayed on shelving made by L&P; barbeque on a grill that's
made up of Leggett cast aluminum - in short, Leggett products are all around you."
Types of coils
There are four different types of mattress coils:
Bonnell coils are the oldest and most common. First adapted from buggy seat springs of the 19th century, they are still prevalent in less expensive mattresses. Bonnell coils are hourglass-shaped, and the ends of the wire are knotted or wrapped around the top and bottom circular portion of the coil and self-tied.
Marshall coils, also called "pocketed coils," are each wrapped in a fabric encasement and usually are tempered, or in the case of the Simmons Beautyrest carbon magnesium is added. Some manufacturers pre-compress these coils, which makes the mattress firmer and allows for motion separation between the sides of the bed.
Offset coils are designed to hinge, thus conforming to body shape. They are very sturdy, stable innersprings that provide great support. (Open offset is called LuraFlex)
Continuous coils, or Mira-coils, work by a hinging effect, similar to that of offset coils. In a basic sense a continuous coil is simply that, one continuous coil in and up and down fashion forming one row (usually from head to toe) of what appear to be individual coils. The advantages of how firm a support the continuous coil provides it is somewhat tempered with the 'noise' associated from a typical mira coil unit. (Serta uses these)
The statement that Leggett makes coils for Simmons and Sealy is incorrect. I have personally been in 3 different Simmons factories and seen, with my own eyes, them making their own coils. Also, Sealy makes their own coils in their metal plant (I can't remember where it is at the moment). Those are the 2 major companies who make their own coils and, yes, Leggett makes most of the rest of the manufacturers coils for them.
The statement that all the coils are the same because they are made by the same company is akin to saying all Chevrolet cars are the same because they are made by the same company. Leggett makes coils, to spec, for most of the major companies in the US. "TO SPEC" being the most important phrase in this statement. Serta has their own coil made by Leggett, but Serta holds a patent on that particular coil system, so no other company can use it. Did you know that Leggett makes over 400 different coil systems? Additionally, you need to keep in mind that there may be multiple ways to make the exact same type of coil! Looking at a Marshall coil (pocketed coil). Simmons, in their factories, receives a huge spool of 15.5 gauge and 13.5 gauge wire. This wire has been electrically "tempered" before shipping. Once in their factory, they have this really cool machine that makes their "Power Pocketed" coil. Upside is that it is a "Power Pocketed" coil, which means a 12 coil is pocketed into a 9" pocket, making the coil a bit more responsive. Downside is that when you bent tempered metal, it re-arranges the molecules and eliminates the tempering effect. Let's look at the same type of coil made for the Restonic "Grand Palais" mattresses. These coils are made by Leggett. Basically the same steps are taken except for the "Power Pocketing", that is a patent currently held by Simmons. One major difference is that the coil made for Restonic is electronically tempered after it is formed into a coil. This makes for more consistent and more durable coils. Simmons will have a higher coil count with slightly weaker, more responsive coils and Restonic will have a lower coil count with slightly stronger coils. Your durability and support will roughly balance out, but the two beds will have completely different comfort levels, assuming everything else (foam layers) are the same.
Bonnell coils are the most common TYPE of coil, but there are literally 40 different sizes of Bonnell coils, that I am aware of, and each of those are available in a multitude of different coil counts.
What you are calling "Offset" coils, again, needs a bit more detail. First of all, it seems, by your statement, that you are slightly biased to this type of coil, without reason. There are quite a few different designs on the "Offset" coil and there are a few different ways these can be used in a bed. Looking at Sealy, they use a "Double Offset" coil, meaning it has a slightly better "hinging" action and they run the coils from head to toe with the helicoil lacing side to side. Now looking at Spring Air, using a completely different design on the "offset" coil, runs them side to side while the helicoils run from head to foot. Some people say the lacing running side to side makes for more body impressions (these are the people who run them head to foot) and some people say that running them head to foot makes for more sagging (these are the people who run them side to side).
Your continuous coil systems are simply a variation of the offset coil system and in the more than 15 years of selling mattresses, I have found neither benefit nor disadvantage this type of coil nor any other coil system.
Bottom line is there are many, many different kinds of coils, not all made by Leggett. Each coil system makes that mattress feel a bit different and react differently. If you were to line up all the coil systems, say 400, side by side and put the exact same amount of padding on each one of them, you would have 400 different comfort levels.
I tell my customers to buy a bed based on comfort and comfort alone and when they do this, they are usually successful. When my customers try to over think the process, that is when we usually have to exchange the mattress for them.
