Looking for plans of moving device

I am looking for plans for a device I have seen before but don't know what it is called. It is a collection of small rollers which would go under 1 corner of "something" very heavy so the "something" could be rolled across the floor. The one I saw had a side profile of a rounded D, and reminded me of the treads of a tank. I would think at least 4 of these would usually be used to move anything. Does anyone here know what the name of the device is, and whare I can get plans (preferrably free) for it?

which would go

"something" could be

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get plans

Searched for hilman rollers. This came up....

Machinery skates? Machinery moving rollers? Try this (from my site):

search for load skates

machine skates or machinery skates.

smaller machines you can roll on pipes.

There are plans here for a much simpler design:

Just a tip. Because of the flood of spam in Usenet, I'm going through and filtering mail from hotmail.com that appears in the newsgroup. And others as they appear. Others are setting their filters, too. I suggest you munge your e mail a little, and then in the message if you want to be contacted explain how to unmunge it. I know I'm going to lose some people's posts, but the spam has reached intolerance levels, and those who don't understand how to set up a newsgroup account will be filtered out.

Like snipped-for-privacy@Xhotmail.com .......... if you want to e mail me, remove the X

Steve

What is the "munging" process? I would liked to have emailed you privately on this, but you didn't leave me a way way to email you (just teasing). I noticed that less than a day after I posted this, that there are 5 pages of new postings, of which roughly 5 are valid desires for communication. All others seem to be advertisements or nonsense postings. This is rediculous.

I want to thank those who did respond to my inquiry, and I really appreciate what a great wealth of knowledge we have here.