"Spinal," Conoid Rocking Chair

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Project by Simeond posted 687 days ago 2154 views 16 times favorited 14 comments Add to Favorites Watch

Two-legged rocking chair with a “spine” back. I made this for a customer. It was also in a furniture show last night and had about 200 people sit in it. This one was a challenge. There is a discussion of the design stage here:

Comments, criticism definately welcome!

-- "...a band of small discoveries, strung like pearls on a thread of curiosity, lending richness to our work...." - James Krenov.......

14 comments so far

View D_Allen's profile


495 posts in 1385 days

#1 posted 687 days ago

Count me out…my recliner does just fine.
Real nice workmanship though.

-- Website is finally up and

View DaddyT's profile


267 posts in 2111 days

#2 posted 687 days ago

Thats one of the coolest chairs Ive ever seen!!

-- Jimi _ Measure twice, cut once.......@#%#$@!!!......measure twice, cut....

View redryder's profile


2106 posts in 1702 days

#3 posted 687 days ago

I’m always a fan of different. You’ve met that goal. I like the contrasting wood colors and the “legs”.

Comfort?? I’ll have to take your word for it….....................

-- mike...............

View Jamie Speirs's profile

Jamie Speirs

4089 posts in 1457 days

#4 posted 686 days ago

I love it

It is a tough challenge though

well worth the effort.


-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

View Kookaburra's profile


745 posts in 825 days

#5 posted 686 days ago

What a conversation piece! I would have been one of those 200 – I would no be able to resist sitting in it just to see if it really were comfortable.

The side view is especially spine-y. I am going off now to read through your blog to see how you ensured adequate strength in that backbone.

A work of art!

-- Kay - Just a girl who loves wood.

View Clint Searl's profile

Clint Searl

1389 posts in 962 days

#6 posted 686 days ago

Most imaginative.

-- Clint Searl.............We deserve what we tolerate

View Monte Pittman's profile

Monte Pittman

13294 posts in 939 days

#7 posted 686 days ago

Love how unique it is. Beautiful work.

-- Mother Nature created it, I just assemble it. - It's not ability that we often lack, but the patience to use our ability

View HalDougherty's profile


1820 posts in 1838 days

#8 posted 686 days ago

Beautiful chair! Very unique design. I’m impressed.

-- Hal, Tennessee

View Bluepine38's profile


2876 posts in 1686 days

#9 posted 686 days ago

Not quite my cup of tea, but it does look beautiful. You took the customer’s request and built her a chair that
was requested and made it look good as well as functioning as it was supposed to. You had fun and made
money, you can not beat that. Thank you for sharing with us.

-- As ever, Gus-the 75 yr young apprentice carpenter

View Simeond's profile


67 posts in 1005 days

#10 posted 686 days ago

Thanks all for your kind comments.

The spine back is attached to the seat by a 3/4” x 2” x 2” bridle joint, and then it continues underneath the chair to attach to the stretcher in a mortise/tenon joint. It is very sturdy in the front/back direction (which is the primary direction of pressure), but not at sturdy in the side/side direction. It don’t think it would break, but more stability might be good.

-- "...a band of small discoveries, strung like pearls on a thread of curiosity, lending richness to our work...." - James Krenov.......

View gfadvm's profile


10579 posts in 1291 days

#11 posted 686 days ago

That is soooo cool! Arms attached to the legs and back would probably stouten the lateral stability. Great job on the design and build.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View SPHinTampa's profile


548 posts in 2286 days

#12 posted 685 days ago

Cool rocker … I am curious as to the science behind the design … did you pick the curve in the back support based on fitting to a person or a set of measurements? Did you pick the graduation in the width of the back supports based on appearance or function?

-- Shawn, I ask in order to learn

View Fishinbo's profile


11216 posts in 776 days

#13 posted 685 days ago

I like the design.
Something rare and exceptional.
Keep making innovative designs.

View Simeond's profile


67 posts in 1005 days

#14 posted 685 days ago


I would call it pseudo-science. I made a full-scale MDF mock-up and tweaked the curve and angles of the back supports to my own back. On thing I will likely do with this mock-up is to make it adjustable, so that it can change from customer to customer.

Truly, the bigger engineering issue is the angle of the leg to the seat and the leg to the rocker – and then where along the rocker’s length to attach the leg. The combination of these three are what determine whether the rocker “takes you into the rocking motion” in a natural flow or whether you have to “work at” rocking the chair.

The graduation in width of the back supports are aesthetic. The graduation in height, however, was done to ensure solid support at lower and upper back (for me, at least – who’s 6’1”).

-- "...a band of small discoveries, strung like pearls on a thread of curiosity, lending richness to our work...." - James Krenov.......

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