Conveying along chain

[ollien]

I've been googling around about this for the past couple of hours, but I can't seem to wrap my head around how teams are utilizing chains for linear motion. Currently, the best item I can find to do something like this would be something like this, but my gut tells me that these would be rather fragile for anything more than a few pounds. If I wanted to move a load along a chain, how would I best accomplish this?