I have seen many chairs that lack one feature. A device much like the one that you use to increase or lower your chair, but this one would work on the back of the chair where you can increase the angle to a straight 90% to help your posture while sitting in the chair. Is there such a device in any chair, and if so, could you please point me towards such a chair?
Thank you.
There are more chairs now a days that focus on posture, AND some have recline locks that actually lock at any position usually in a 90-135 degree range, and lock tight with no wiggle. What I'm saying is, if you want a true 90 degree angle chair, don't trust those cheap locks that merely have a rod that slides in a hole, because they tend to have play in them, and the amount of play can increase over time.
A lot of posture chairs are also mesh type and have lumbar sections that adjust up and down, and some even in and out. Be careful with mesh chairs that are modular and tout themselves as fitting a wide range of body heights though, as the upper back section is often at a fixed height and the lower edge of it's frame can dig into your back if you like the lumbar low.
Lastly, don't forget the lumbar shape and position are as important as the sitting angle. Avoid chairs that have a flat lumbar, as it can cause you to slump over time, even at a 90 degree angle.
In summary, what you're describing is more overall chair design as far as sitting angles go, and not a single feature. Basically search for "ergo" or "posture" chairs to narrow your search for chairs designed to reduce back pain. I also recommend narrowing your search to chairs that have a lot of positive comments on customer service of the manufacturer. Some will even send out parts like shorter or longer gas cylinders to accommodate shorter or taller customers.
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