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In the interest of saving space, I'd like to have a stool that can double as a table. I'd like the height to be adjustable from 16 inches to 32 inches.

But I can't find any pneumatic/spring piston with such a long travel (10" at most). It seems the problem with long travel pistons is that the amount of weight that can be held when fully extended is low due to piston bore volume being so big, allowing the air to be easily compressed. Likewise, an unreasonably large force will be needed to completely compress the spring when you want to retract the piston all the way. While it would be nice to have an extra tall stool to sit on, most of the time it will only be used as a table when extended that high.

I don't want this to be another shopping list question, so please also discuss any principles and about why this is or isn't practical, or propose alternate solutions

hazzey
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Yale Zhang
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  • Consider this question obsolete since a much better solution is to use linear actuators. But given the effort spent, I should extend my original goal to a combination stool, table, and freight elevator that can go up 2m high! There's a very brilliant telescoping linear actuator that can make this compact solution possible: the Paco ILS-75 Spiralift. I've also been looking on Alibaba for similar solutions and found Lunyee's LY-DJ813 for adjustable height desks (go from sitting to standing) but the desk types are limited to 800mm stroke. 1500mm is possible but will be bigger. – Yale Zhang Feb 14 '16 at 04:47

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