Is there a name for this sort of object? I need something like this, but don't know what to type into the webs

I’m going to convert my computer chair from pneumatic to static. I’m currently using plastic clasps that are held on with jubilee clips, but they’re not great and need replaced (I’m a heavy lad). A sturdy metal version would be better.

I’m assuming the plumbing world would have something like this, but the language of the plumber is arcane and inaccessible to regular goombas like me. What do I type into the search box?

Cheers!

BadMonkeyEdd,

I made my own. My piston kept sinking on my chair, so I got some 40mm waste pipe I had lying around, cut it to length, then slit it once lengthways.

I put it over the piston (pulled the pipe wide enough to slide over the piston, not easy, but doable) and wrapped it with duct tape to stop it pinging off.

It is still there 5 years later.

Leate_Wonceslace,

It looks like a shackle.

Warl0k3, (edited )

Clamshell clamps or Truss Clamps aren’t exactly what youre looking for, but they’ll work. Clamshell clamps are used in automotive and plumbing applications, truss clamps are used for mounting lights and speakers to stage trusses. You can get them cheap on amazon, and stacking several of them up works great for spacing shafts.

“Stroke Limiting Shaft Collars” are exactly what you’re looking for, since they’re designed to do exactly what you’re attempting here but for industrial pneumatic or hydraulic equipment. Unfortunately since they’re for industrial equipment, they can be stupid expensive and a royal PITA to find. But they do have a very silly name, even for hydrualic equipment (which is a field whose jargon is entirely made up of double entendre), which is a point in their favor. Also, many of them work very well as bearing surfaces!

PLEASE be careful messing with the cylinders in office chairs though. It doesnt sound like youre planning to, but just a blanket warning. Much like garage door springs, those cylinders store WAY more energy than you would believe, and fucking up trying to take apart a damaged cylinder can send the piston an impressive distance through your chest.

58008,

Thank you so much, those shaft collars look to be a much better design than the thing I drew (not much of a surprise to be honest!), I can stack a series of these instead of looking for one big solid one.

I didn’t know that the cylinders were so dangerous 😬 I must have lucked out; I’ve had to use extreme brute-force methods to dislodge the old ones when it was time to replacement them, pointing the thing directly at my guts and face while I work it loose with a hammer and spanner. Sounds like I was unwittingly playing Russian roulette with my chair. The difficulty I have in pulling out the cylinder is why I wanna just go with a “static” setup, it’s way too much work and effort for something so simple. Now I can also add “don’t want my cheekbones to get lodged in the ceiling” to the list of reasons to go static.

Thanks for the info and the warning!

Warl0k3,

No problem, I’m just glad all that time I spent memorizing the McMaster-Carr catalog finally came in handy!

The cylinders are sealed units, so they’re safe to handle even after beating the crap out of them. The danger happens when people decide to repair a failing seal or leak and try to open the cylinder itself to get at the piston head - usually with a hacksaw…

PM_Your_Nudes_Please,

PLEASE be careful messing with the cylinders in office chairs though. It doesnt sound like youre planning to, but just a blanket warning. Much like garage door springs, those cylinders store WAY more energy than you would believe, and fucking up trying to take apart a damaged cylinder can send the piston an impressive distance through your chest.

In fact, if you look at the bottom of your chair where it sits on top of the piston, there should be a solid metal plate just above that. That metal plate is specifically placed there to avoid any surprise butt-stuff from a piston failing and rocketing up through the seat cushion. Because if that plate isn’t there, you will end up with a piston lodged three inches into your ass/taint area.

invisiblegorilla,

Scaffolding sleeve clamp or Scaffolding sleeve coupler

misanthropy,

Shaft collars probably the closest to what you’re looking for that’s easy to search for

JackGreenEarth,

Where’d you get that image? Did you draw it yourself?

58008,

I did 🤣 My skillz are known across the land. They call me the Paint.NET Bastard.

edgemaster72,
@edgemaster72@lemmy.world avatar

So I found products like you’ve shown on Amazon while looking to do the same for my chair but the cylinder on my chair is bigger than I guess “normal” ones, so what I ended up doing instead was using something apparently called a pipe nipple, like this one, that fits over the cylinder. I got the idea/process from this video except substituted a metal nipple like I linked above instead of a plastic coupling like they show. Anyway, it’s been working fine for 9 months so far, just make sure you know how much height you want between the base and the seat for the length, and that the inner diameter (ID) of the nipple fits the outer diameter (OD) of your cylinder.

maculata,

What about those metal bands that can be tightened with a screw? ‘Hose clamps’ I think.

d00ery,

That’s a generic name for a Jubilee clip - www.jubileeclips.co.uk/products/original/

So a good idea, but OP is hoping to upgrade from this.

maculata,

Ah yes. OK, I missed that detail in the text.

Mind you they’re only Jubilee Clips when they’re used to hold a King’s or Queen’s Jubilee together.

Otherwise they’re just ‘hose clamps’.

Darkassassin07,
@Darkassassin07@lemmy.ca avatar

Eh, make your own: short bit of pipe cut to length, split down the length, then held on the chair column with hose clamps.

Anticorp,

Cable collar maybe?

jordanlund,
@jordanlund@lemmy.world avatar

“Manacle”?

RaoulDook,

Kozyrev Mirror, you sit inside it and hallucinate other dimensions or something like that

KingJalopy,

Shit dawg, you holdin? I’ll take 5 but I gotta pay you tomorrow.

bhmnscmm,
@bhmnscmm@lemmy.world avatar

This sounds like it would accomplish what you need. Look up two piece shaft collar, or shaft coupler.

www.mcmaster.com/search?q=hinged shaft collars

Use McMaster to find what you need. You should be able to find a cheaper supplier using McMaster’s terminology.

neidu2,

We used something similar in this job I once had. We usually referred to them as “collar” or “clamp”. In our procedures it was refered to as “clamping collar” to make it as little ambiguous as possible.

It was nicknamed “Dachs armor” as it was about the same length as the belly of a dachs hound, and roughly about the same diameter.

Nougat,

I have used something like this on a chair with a leaky piston, there are ones specifically made for this purpose. They are plastic, and useless.

I suspect that using a metal one would last longer, but still fail, either by breaking itself, or by embedding it into the plastic of the chair on the top or bottom. I bet you would be more successful replacing the entire piston assembly with a stout metal pipe, but even that could break the piston seats at the top or bottom.

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