Subject:
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Re:Derailer ( Building a bicycle wheel)
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 26 Sep 2000 06:23:23 GMT
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Viewed:
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914 times
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I tried to make a derailer transmission a few years ago, but pushing the chain
off of the gears just wasn't working. Since you brought it up, I had a new
idea. I don't think this would work for anything much smaller than a 2:1 scale
bicycle, but it could be turned into a new type of Lego transmission that I
don't think anyone has pulled off yet.
My new approach is a double chain lifter. It opens up the chain into a wide
enough triangle that the sprocket stack can slide to different sizes of gears.
I don't have it worked into an actual transmission, but I think the concept is
viable. The gears turn at least.
Big sprocket:
http://www.best.com/~amnon/Homepage/Games/Lego/Derail1.jpg
Opened up:
http://www.best.com/~amnon/Homepage/Games/Lego/Derail2.jpg
Small sprocket:
http://www.best.com/~amnon/Homepage/Games/Lego/Derail3.jpg
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Message is in Reply To:
 | | Building a bicycle wheel
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| Dunno if anyone remembers a couple weeks ago-- someone came up with the challenge of building a working bicycle from Lego bricks (working gear shift w/ chain, derailler, coasting ability, etc), but I think I've determined that no actual prefab Lego (...) (24 years ago, 25-Sep-00, to lugnet.build)
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