US 4,599,841 · Granted 1986-07-15
The T-Shaped Connector That Made IKEA Floors Click Together
This patent describes a simple clip-and-groove system that holds wooden boards together to form floors or panels. Instead of nails or screws, a soft plastic T-shaped connector wedges into grooves in the boards' edges, letting them shift slightly as wood naturally expands and contracts with humidity and temperature changes.
The plain-English version
What it protects
The claim covers a panel assembly where boards are joined edge-to-edge using a T-shaped moulding that slides into grooves carved into the boards' sides. What's protected here is the specific geometry: the transverse web of the T has holding teeth on both sides, and each half projects into a deep, smooth groove in the adjacent board. The groove width is calibrated to be slightly smaller than the web's thickness, creating a snug fit. The moulding itself is made from soft materials like plastic or rubber, not rigid metal.
Why it matters
This patent reflects a pivotal shift in flat-pack furniture assembly: moving away from skilled carpentry toward systems that unskilled people could install at home. By using a soft T-shaped connector instead of nails or permanent joints, the design also solved a real engineering problem—wood naturally expands and contracts with moisture and temperature, which would crack rigid joints. This allowed boards to move slightly relative to each other without damage, making the floor or panel more durable and easier to assemble without tools or expertise.
Real-world use
When you assemble an IKEA laminate or wood floor in your living room, you're likely snapping boards together using a connector very similar to the one this patent describes—no hammer required.
Original USPTO abstract
A panel structure comprising boards and for instance serving as a floor or a panel, the boards being arranged on the same plane edge to edge. The boards are held together two by two by means of a joining moulding of a substantially T-shaped cross section. The transverse web of the joining moulding is provided with a plurality of holding teeth to both sides of the vertical web of said moulding. Each half of the transverse web projects into its longitudinal locking, relatively deep, and substantially smooth groove in a board. The width of the groove is slightly smaller than the thickness of said transverse web. The joining moulding is of a relatively soft material such as plastics or rubber. In this manner the panel structure is so simple to mount that the mounting can be carried out by unskilled persons. Without damaging the panel structure, the boards may work relative to each other when exposed to variations in air moisture and/or temperature.
Patent details
- Publication number
- US 4,599,841
- Filing date
- 1984-04-06
- Grant date
- 1986-07-15
- Assignee
- Inter-Ikea Ag
- Inventor(s)
- HAID; PETER
- CPC class
- F16B5/0004
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