"Spinal," Conoid Rocking Chair

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Project by Simeond posted 09-09-2012 01:50 AM 3881 views 17 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 3861 days

#1 posted 09-09-2012 02:32 AM

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

-- Website is finally up and

View DaddyT's profile


267 posts in 4587 days

#2 posted 09-09-2012 03:05 AM

Thats one of the coolest chairs Ive ever seen!!

-- Jimi _ Measure twice, cut [email protected]#%#[email protected]!!!......measure twice, cut....

View redryder's profile


2393 posts in 4178 days

#3 posted 09-09-2012 07:13 AM

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

4168 posts in 3933 days

#4 posted 09-09-2012 09:12 AM

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


749 posts in 3301 days

#5 posted 09-09-2012 12:30 PM

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

1533 posts in 3438 days

#6 posted 09-09-2012 12:34 PM

Most imaginative.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

View Monte Pittman's profile

Monte Pittman

30615 posts in 3415 days

#7 posted 09-09-2012 01:43 PM

Love how unique it is. Beautiful work.

-- Nature created it, I just assemble it.

View HalDougherty's profile


1820 posts in 4314 days

#8 posted 09-09-2012 02:59 PM

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

-- Hal, Tennessee

View Bluepine38's profile


3391 posts in 4162 days

#9 posted 09-09-2012 03:37 PM

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 80 yr young apprentice carpenter

View Simeond's profile


101 posts in 3481 days

#10 posted 09-09-2012 09:41 PM

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


14940 posts in 3767 days

#11 posted 09-10-2012 12:49 AM

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


567 posts in 4762 days

#12 posted 09-10-2012 12:21 PM

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


11362 posts in 3252 days

#13 posted 09-10-2012 08:42 PM

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

View Simeond's profile


101 posts in 3481 days

#14 posted 09-11-2012 03:00 AM


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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