Dual-Zone Split-Spring Mattress with Removable Fabric Cover

The problem

When two people share a bed, they rarely agree on how firm the mattress should feel. Buying two separate twin mattresses creates a gap in the middle, while a single compromise mattress often leaves one sleeper uncomfortable. According to the patent, the goal is to build a single integrated mattress that provides two different support experiences side by side without sacrificing structural stability or hygiene.

The solution

1. A rigid bottom plate (4) serves as the foundation. Its outer edge is sleeved by a rectangular cloth bag.
2. A partition cloth is sewn down the middle of this bag, dividing the interior into an independent cylinder spring bag (7) on one side and a standard spring bag (11) on the other.
3. On the first side, independent cylinder springs (5) are screwed vertically to the bottom plate at equal intervals. Each spring slides into a non-woven tube bag (6), whose top touches the inner roof of the pocket zone.
4. On the second side, standard springs (8) are screwed to the plate and linked together in series using stainless steel wire. A rectangular non-woven block is glued to the top of each standard spring, touching the inner roof of its bag.
5. Open zippers (10) run along both sides of the spring bags.
6. A lower cotton pad (3) rests beneath the spring layer, and an upper cotton pad (9) sits directly on top.
7. The entire core drops into a mattress surface material bag (2). A mattress fabric zipper (1) connects this bag to a removable mattress fabric cover (12).

Who it is for

• Mattress brands targeting couples who want to market a “dual-firmness” or “split-feel” product without requiring buyers to purchase two separate beds.
• Hospitality and hotel procurement teams looking for a versatile mattress that accommodates guests with varying weight profiles and comfort preferences on a single bed frame.
• E-commerce private-label sellers on platforms like Amazon who need a distinct, easy-to-explain feature (two springs in one bed) to stand out in a crowded bedding category.
• Contract furniture manufacturers supplying dormitories or assisted-living facilities where standardized frames must serve occupants with different support needs.

How it works

The main parts

Assembly and use

1. Spring installation - The independent springs (5) are screwed into the bottom plate (4) on one side of the center line, and the standard springs (8) are screwed in on the other. The distribution area of both spring types is identical, and their tops align on the same horizontal plane.
2. Bagging - The springs slide into their respective zones inside the rectangular cloth bag, divided by the sewn partition cloth. Non-woven blocks on the standard springs and tube bags on the pocket springs press against the top inner walls of their compartments.
3. Padding - The lower cotton pad (3) is laid under the bag, and the upper cotton pad (9) is laid over it.
4. Covering - The padded core is placed inside the mattress surface material bag (2). The top inner edges of this bag attach to the outer wall of the rectangular cloth bag using concealed snaps, and the bag’s height is three-quarters of the cloth bag’s height.
5. Zipping - The quilted mattress fabric cover (12) is zipped onto the opening of bag (2) using the mattress fabric zipper (1). When the cover needs cleaning, the user simply unzips it.

Applications

Master bedrooms for couples

One partner sleeps on the pocket-spring side to minimize motion transfer when the other turns over, while the second partner sleeps on the interconnected-spring side. The single cover hides the split entirely.

Guest rooms and boutique hotels

Hotel operators can place this mattress on any standard queen or king frame. Guests who prefer one type of spring system gravitate to that side, reducing the need to stock multiple mattress types.

Online direct-to-consumer bedding

E-commerce brands struggle to differentiate heavy, expensive-to-ship mattresses. The visual story of two distinct spring systems inside one zip-off cover gives marketing teams a clear diagram to show on product pages, helping justify premium pricing.

Student housing and dormitories

Dorm beds take heavy abuse from occupants of widely varying weights. The interconnected spring side handles heavier loads through shared tension, while the pocket side offers lighter students pressure relief. The washable cover simplifies maintenance between semesters.

Where it is less suitable

• Adjustable bed bases - The rigid bottom plate (4) described in the patent prevents the mattress from bending at the hinges required for adjustable frames.
• Ultra-thin mattress profiles - Because the design relies on a base plate, two types of vertical springs, and dual cotton pads, it cannot be compressed into a low-profile roll-pack format.
• All-foam preference markets - Buyers specifically seeking memory foam or latex constructions will not be interested in a dual-spring mechanical core.