US 6,386,634 · Granted 2002-05-14
The Herman Miller Patent That Reinvented How Office Chairs Tilt
This is a patent for an office chair that tilts and pivots in a smarter way than regular chairs. The seat and backrest work together to lean back while the seat itself can rotate around a point that lines up with your hips, so you move more naturally instead of staying stuck in one position.
The plain-English version
What it protects
The claim covers a tiltable chair where the seat and backrest tilt downward and rearward together as a unit, combined with a separate pivot point in the seat itself that aligns with the user's hip joints. What's protected here is that specific linkage assembly and the geometry that lets both tilting and hip-centered rotation happen simultaneously. The patent also covers the vertically adjustable support column, the elastic membrane system in the seat frame, and the articulated armrests.
Why it matters
This patent represents a significant engineering approach to ergonomic office seating. By aligning the pivot axis with the user's actual hip joints rather than using a fixed tilt point, the chair allows more natural body movement and potentially reduces strain during long work sessions. The combination of features—the dual-motion mechanism, elastic support membrane, and adjustable components—creates a system that competes on comfort and biomechanics rather than just basic recline.
Real-world use
When you lean back in an office chair at work and feel the seat pivot smoothly while the backrest tilts with you, that coordinated movement is the mechanism this patent describes.
Original USPTO abstract
A tiltable chair including a base member ( 44 ), a seat ( 32 ), a back ( 34 ), and a linkage assembly ( 40 ) adapted to allow the seat and back to tilt downwardly and rearwardly and to allow pivotal movement of the seat about a pivot axis ( 52 ) in substantial alignment with the hip joints of a user. Other aspects of the invention are to provide a vertically adjustable column ( 42 ) for supporting the seat of the chair, a support assembly including a frame member ( 33 ) having a central opening therethrough and a receptacle formed around the perimeter thereof, a carrier member adapted to fit inside the receptacle, and a membrane of elastic material ( 210 ) covering the central opening, and a pair of armrests ( 36 ) adapted to be mounted to the chair to allow pivotal movement thereof.
Patent details
- Publication number
- US 6,386,634
- Filing date
- 1993-06-15
- Grant date
- 2002-05-14
- Assignee
- Herman Miller, Inc.
- Inventor(s)
- STUMPF WILLIAM E., SCHOENFELDER RODNEY C., CHADWICK DONALD, KELLER CAROLYN, COFFIELD TIMOTHY P., SAYERS RANDY J., BRUNER JEFFREY W., MILES GEORGE A., CAMMENGA ERIC, CROSSMAN PHILIP
- CPC class
- A47C7/02
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