US 5,518,294 · Granted 1996-05-21
The Shape-Shifting Backrest That Molds to Your Spine
Imagine a back support that isn't rigid—it's flexible and smart enough to shift its curve depending on where your back pushes against it. This patent describes a one-piece cushioned support with finger-like extensions that create a movable arch, so whether you're slouching, sitting upright, or leaning back, it automatically adjusts to support your spine in the best way possible.
The plain-English version
What it protects
The claim covers a single-piece back support made of flexible material with a central body and outward-extending support fingers that form an arch. What's protected is the specific design where the arch's peak (apex) shifts position based on how hard and where a person's back presses against it. The claim includes the method of how this variable arch shape responds dynamically to load, meaning competitors can't copy this exact mechanism of self-adjusting support without licensing or designing around the patent.
Why it matters
Back support is a huge market—cars, office chairs, and wheelchairs all use them—and most traditional supports are static, meaning they have a fixed curve that works poorly for different body types and postures. By patenting a support that automatically adapts its shape to the wearer's spine, Ligon Brothers created a commercial advantage in designing more comfortable seats. The flexibility to fit many users without custom molding reduces manufacturing complexity and expands the product's appeal across vehicle and furniture makers.
Real-world use
Every time you sit in a car seat or office chair with a contoured back panel, you might be using technology derived from this adaptive support concept—the backrest shifts slightly as you move, trying to maintain comfort across different postures.
Original USPTO abstract
A single-piece strong, flexible back support for use in seats such as automobile seats or office chairs, includes a central body portion with outwardly extending support fingers such that an arch having a variable apex is formed when the back support is subtended longitudinally. The longitudinal location of an apex and the shape of the arch formed on the back support changes responsively to a load imposed by a person's back. The inventive back support is capable of taking a variety of shapes thereby providing maximum comfort and support regardless of the user's spinal curvature or posture and position relative to the back support.
Patent details
- Publication number
- US 5,518,294
- Filing date
- 1994-05-23
- Grant date
- 1996-05-21
- Assignee
- Ligon Brothers Manufacturing Company
- Inventor(s)
- LIGON, SR.; JAMES T., PORTER; STEPHEN P., PATRIAS, JR.; ANDREW L.
- CPC class
- A47C7/46
Want to file your own patent?
Before you design your own ergonomic seat or chair back, check our free scanner to see what support innovations are already staked out in the furniture space.
Free patentability scan