Let's get into table design for a second. If you look at your average dining table, you'll see most have aprons. The aprons prevent racking and, in the case of solid wood tops, help prevent the tops from warping.
Look underneath the average dining table and you'll see the aprons are often connected to some type of corner braces. These are to keep them square and provide a solid connection with the legs.
Aprons and braces, necessary though they may be, require more raw material, are extra things for a manufacturer to ship and extra things for a consumer to assemble, not to mention pay for. So Ikea has done away with both aprons and braces with their Lisabo line.
Here's how they did this. Remember the funky wedge dowels Ikea's prototype engineers came up with a couple of years ago?
Ikea designers Knut and Marianne Hagberg took the wedge dowel concept and applied it to the legs of the Lisabo series of tables and desks.
By CNC-milling striations into the top of the leg, and a corresponding shape into the underside of the tabletop at the four corners, the Hagbergs created a leg that simply slides into place and locks in with a single screw holding a wedge.
This wedged, striated joint provides enough registered contact area to preclude racking, meaning aprons aren't required. Since there's no need for aprons, there's no need for corner braces. And the consumer can pop the legs in quickly, which is a boon not only the first time they do it, but anytime they move.
And the table's pretty easy on the eyes, too. The Hagbergs used the old design trick of chamfering the underside; since the tabletop's got to be thick enough to accommodate the joint, chamfering the edges provides the illusion of thinness to the top, making the table look airy.
Anyways, this is just an example of how prototype engineers seeking a faster joint connector ended up influencing and advancing the design, both aesthetically and from a UX perspective, of a dining table. The Lisabo uses less material and looks, to my eye, prettier than its rectilinear, apron-and-corner-brace-saddled cousin.
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Seems the editor isn't aware that canting the legs is indeed integral to the design. The joint that they came up with is great for the flat pack design and simple assembly, but by angling the legs they are able to get rid of both the apron and the braces, because this does it by putting the legs in constant tension. Now if you go to IKea , you'll see that the legs still rack/ wobble - but far less.
I keep coming back to this article which illustrates evolution in table design quite well, because this concept (no substructure) is something I have spent a fair amount of effort on myself. I use a different technique (and a bit more complex) which uses tension and a broad stance against the underside of the top. The solution shown here captures the tenon in a tapered mortise giving a vise-like connection. The look is sleek but the result marginal and the volume of wood is a trade-off as a thick top is required.
RN, after posting that link, I had a flurry of studious views, received a bucket load of spam, and had one invitation to enter a pay-to-play European design competition. Ain't it grand?
So elegant The picture of the table with chairs Leaves me wondering when a complementary chair is forthcoming and Whether there would be a detail Wherein the rail of the chair back up from the topside Could be in line with chair leg from the underside As is and Wedged in only with the block from the underside Leaving the seat unsullied The bevel would be nice if curved
Very slick but I expect there's some transverse wiggle, probably could not dance on it.
Hi Chuck, please post a link to your work, I'm interested
You can see some here; www.chuckmackdesign.com though I have not upgrade the site for some time.
Scott, thanks for noticing. The concept with the colored legs is a true 'knockdown'. The connectors are spring steel clips from Modular systems - those together with the drop-in crossbar gives a sturdy result as does the 3-point single bolt system on the round table concept.
Nice prototype. What happens when the design changes? What happens when substrate qaulity changes? What happens with varied long-term addition stress (movement,usage, age)? Ikea furniture joints are NOT STABLE LONG TERM. You need flexible adhesive.
Is this really a material saving considering the tabletop has to be that thick?
It could if they constructed it the same as the tables in the link they provided
Really interesting and a great innovation. Question, I noticed the legs with the new joint aren't quite vertical. Do they have to be at an angle because they are not quite as strong as a apron and corner brace? Or was that an aesthetic choice?
I believe it's a bit of both. By splaying the legs, you set the physics up such that any weight on the table is driving the legs tight against the wedges, precluding wracking. And I think that aesthetically the table looks better with angled legs.
Angled legs would see a moment on the joint putting all kinds of stresses on the connection. Straight legs would only load the flange of the leg. This all assumes a vertical static load on the table. Bumping the sides of the table would put a moment on straight leg joints as well.
This is super cool. Hopefully we as consumers will be able to purchased router bits that enable the fabrication of this kind of joint soon!
*Hopefully was as fabricators will be able to purchase...
Not sure what happened when I typed this
Rain, you should get some kind of read-it-here-first award for positively linking the words "Ikea" and "boon... any time they move". Very neat.
That's a really nice looking table, so simple.