US 5,558,398 · Granted 1996-09-24
The Self-Inflating Seat Back That Learns Your Spine
Imagine a seat back made of tiny air-filled pockets that automatically puff up or deflate to match the exact curve of your spine as you sit down. The system uses compressed air and clever tubing to gently reshape itself within seconds, so whether you're tall, short, or shift around, your back gets custom support.
The plain-English version
What it protects
The claim covers a seat back containing interconnected air chambers that respond to an occupant's weight and position by adjusting their inflation level. What's protected here is the specific arrangement of these chambers in vertical pairs, the use of restrictors in the tubing to slow air flow and create time delays, and the automatic pressure-regulating system that keeps chambers fully inflated when the seat is empty but allows them to compress and reshape when someone sits down.
Why it matters
This patent solves a genuine problem in seat design: one-size-fits-all back support fails for different body types and postures. By automating lumbar support through air pressure rather than fixed foam or springs, the design adapts in real time without manual adjustment. This approach could reduce back strain during long sitting periods, which matters for office chairs, vehicles, and medical seating where comfort directly affects productivity and health.
Real-world use
You'd experience this in an office chair or luxury car seat that seems to mold itself to your back as soon as you sit down, without needing to manually adjust lumbar support dials or buttons.
Original USPTO abstract
A seat back for a seating system wherein the contour of the seat back is automatically adjusted to the spinal curvature of an occupant by a multiplicity of compressible interconnected plenum chambers which project horizontally forward from the seat back and are connected to a source of air under sufficient pressure to inflate and maintain the plenum chambers fully extended when the seat is unoccupied. The plenum chambers are interconnected by either very small-diameter tubing, or tubing having small-orificed restrictors therein for reducing the rate of flow of air from one chamber to another for introducing a time delay between movement of the occupant and inflation and deflation of the chambers affected by such movement. The plenum chambers are arranged in one or more arrays each consisting of vertically-separated pairs, the chamber of each pair being equally spaced from a vertical center-line. When an occupant is seated, or shifts position while seated, air is automatically distributed among the plenums, at a controlled rate, so as to alter the horizontal extension of the plenum chambers and, accordingly, the contour of the array(s) to the spinal contour of the occupant.
Patent details
- Publication number
- US 5,558,398
- Filing date
- 1993-11-08
- Grant date
- 1996-09-24
- Assignee
- Santos; James P.
- Inventor(s)
- SANTOS; JAMES P.
- CPC class
- A47C4/54
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