Over the years we've looked at multiple designs for stair-climbing handtrucks. The UpCart uses a triangular configuration of wheels:
The TechLift design used mechanical advantage in a clever way, but the product didn't last in the market:
Dutch company Matador seemed to give up on making it easy, and simply installed protective glides on this unit that the user was meant to schlep up the stairs.
That last one is an older design, and Matador has since updated it with their battery-powered M-Stairs design:
Here's how it works, if you couldn't guess:
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The M-Stairs can haul 150kg (331 lbs).
I don't doubt it does the job, but it will require quite the enlightened employer to pony up for one of these: The asking price is €5,484 (USD $5,876).
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Price aside, that thing looks heavy with batteries, electronics, motors etc. Most delivery destinations where this might be useful will not have a high dock. Is there an easy way to load and unload that thing from a truck or van?
How does that last one go down the stairs? I'd think it'd be pretty frightening to edge it over the step with something heavy and/or expensive.