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04-05-2009, 09:42

Post: 161730

auerbach

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Join Date: Sep 2007
Location: West of Toronto
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

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Electric Compact Equipment

David, for decades there've been forklifts powered by batteries or propane. I bought a small tractor powered by six golf-cart batteries in 1972, and it's worked hard for me since with just new batteries every 5-7 yrs. Similar units work in barns and greenhouses. I've heard of battery compact tractors but haven't seen one. Other heavy battery-run industrial equipment is rare, but I'm sure will increase as battery technology improves over lead-acid. There are sites devoted to this topic.

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04-05-2009, 16:30

Post: 161746

auerbach

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Electric Compact Equipment

Shalom, Avishay, thank you and I'll try to help.

I saw a video on your wheel-track mechanism, and can now respond better to David Levin's original question. You use a clever and unique flexible wheel-cover that can be automatically expanded to include a pair of bogey wheels, increasing the ground contact and therefore the traction, and allow it to climb stairs. That works on small, light applications like wheelchairs and robots, but I do not see any flexible material having the strength needed for agricultural or construction equipment.

As for batteries, yes they can provide plenty of clean, quiet power (think of World-War II submarines) but they are so heavy (the 24V ones used in many forklifts must be installed/removed by machinery) that the first step has to be more power-dense batteries. And that problem (for the desperate car industry) always seems to be next year's solution. But there are companies selling small tractors like mine, as well as low-speed "city cars," powered by lead-acid batteries.

NEW: on Reuters UK, see the clip called "China's Walking Chair." It's an equally elegant but mechanically different approach to a stair-climbing chair.

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