OT? strut in desk chair or kitchen chair

OT?
A lot of desk chairs and kitchen chairs have a center strut, that compresses when one sits down.
What is the point of it?
Is it supposed to spring back, so everyone sits at the same height wrt his arms and the desk or table?
Does it mean a height adjustment is no longer necessary on the chair?
Is it just supposed to accept the jolt when one sits down, so it's comfy to sit down? And does that mean a height adjustment is still needed?
I need as many as 3 new desk chairs, for the work bench, the office, and the kitchen. I've only shopped a little.
One webpage says there should be adjustable lumbar support. I've had some nice comfortable chairs but I never remember having that**. Not really important right? **The best chairs wore out over 8 months ago, so they're not here ot remind me.
Seems to me I need a height adjustment, a reclining resistance adjustment, so it will recline but not before I'm ready, and I know there is a third but I can't remember what it was.
Thanks.
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On 03/16/2014 08:52 AM, micky wrote:

<snip>
A few years ago my wife bought me a new chair for my office and of course yelled at me for not looking at the assembly instructions.
Of course I put it together backwards and the seat, instead of leaning back, leaned forward. She really had a good laugh.
I told her that if a good engineer designed it, the holes would only line up in one way, making a reversed assembly impossible.
Anyway,,,the need for a strut should be intuitively obvious.
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There is a story that Abraham Lincoln had the front legs of his office guest chairs shortened slightly so that the "guests" would be sublimily urged on their way. No idea if it is true or not.
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dadiOH
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On 03/16/2014 11:11 AM, dadiOH wrote:

I think I may have heard that...who knows if that's true?
I do recall though, back in those days, Lincoln would actually spend some time talking to people who just walked up the the White House and ask to see him.
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So if it is obvious, you should be able to explain it.
It's not obvious to me or I wouldn't have asked, right? I don't seen any need for a strut. One of my best chairs just had a center post. the seat height was adjustible on the post. and the seat swiveled on the post, amd that was all that was needed.
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On 03/17/2014 02:23 AM, micky wrote:

I often say that when something is not obvious to me.
Maybe if you posted a link to a photo, I'd know what you are talking about.
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LOL

I wrote what follows before I thought to google the particular part, and way before I found out you could buy a universal replacment. http://www.officereplacementparts.com/universal-gas-cylinder-and-mechanism-combination/
The explanation is good but doesn't actually answr any of my qustions!
My strut was broken but other things, upholstery parts, were broken too. Too hard to repair.
I disassembled the chair and threw it away, but it's not too hard to describe. By strut, I mean the definition used in a car that has struts, not a fixed length support but like a shock absorber that spends most of its time almost fully extended,, with a shiny metal shaft that goes into a hydraulic cylinder. Probably not as big as the strut that holds up the car, but bigger than one of those hydraulic struts that hold up a trunk lid or hood.
You can tell the chair has one when you sit down, if you're heavy enough at least. The chair seat goes down after it's sat on. (Maybe comes part way up, esp. if you stand up a little. Definitely comes up the rest of the way when you get off the chair.)
If you weigh 150 or less, I'm not sure how you would notice except by looking. and then there is a cover in the way. This chair had 3 black plastic tubes, about 5 inches each, one inside the other. They telescoped in and out, were attached so whatever the height of the seat, they surrounded the strut.
One time I sat on the chair and the seat exhaled some gas, psss, went way down,and didnt' try to go back up. I'm not complaining, just describing. It was old enough to have given good service for quite a few years.
The chair without the strut was an older heavier chair in general and it had a heavy post holding the seat up. I'm sure there is more than one way this style could work, but my very fancy desk chair, that had a little damage and I got out of the trash on Wall St. NYC, and which lasted for 20 more years, had "threads" but only on 45 degrees of its circumerence, for raising and lowering the seat, using some big bolt iirc that screwed up and down the seat post.
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wrote:

It says " Universal Gas Cylinder and Mechanism Combination
If your chair underside looks like the image above and you purchased your chair from an office supply superstore, then our Universal Gas Cylinder and Seat Mechanism Combo will very likely match up. "
It sounds like if you bought your chair at a better office supply store, it wouldn't be made this way.
If "better" isn't the alternatitve to "superstore", what is?

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On 03/17/2014 08:23 AM, micky wrote:

Ok . The chair I am sitting on now has a center strut. As far as I can tell, it's like a car's shock absorber. This chair is pretty comfortable and the cat sleeps on the other such chair at night.
Since most of the people I've seen have built-in shock absorbers ...I imagine they put those struts in the chairs mostly for cat comfort.
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I don't have a cat, and I've always had an adequate shock absorber. . I wonder if the salesman will tell me I don't need a strut.
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On 03/17/2014 01:00 PM, micky wrote:

<snip>

My cat did not sleep so well last night. Fortunately I have a fully equipped workbench and will be recalibrating the strut later
https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-frc3/t31.0-8/1501407_758254487535256_1958505492_o.jpg
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I have a HP audio generator too.
Greg
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You appear to be talking about the gas (hydraulic?) height adjustment COLUMN (not "strut"). If it goes down when you sit on it, it is broken.
--

dadiOH
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Yeah, that's it! So it's to adjust the height of the chair! Never had a new chair, so I didn't know that.

And other parts were too.
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