Looking for a specific type of shop stool

[Troubleshooter]

As the title says, I'm looking for a specific type of stool for the shop, but not having much luck.

Some years ago, I remember one of the shops had a stool with both solid metal feet (I think four of them) and casters. The stool had springs so that the solid feet only touched the shop floor when you were sitting on it; otherwise the spring caused the feet to rise an inch or so off the floor so that only the casters remained in contact. So it would roll when you stood up but was solid when you sat down.

Having a heck of a time finding these, or even trying to remember what they called them.

Anybody else remember these and know where they can still be purchased?

Thanks in advance for any help.

 

[Bob V]

There is a "kick stool" that works like you describe, but it is a step stool, could always bolt a chair seat to it. Or just glue some foam on it
http://www.wibeladders.com/products/trestles-stools/step-stools/step-stool-kick-step/

 

[Troubleshooter]

Thanks, that's the right idea. The one that I remember was a tall stool (like a drafting stool).