In this twisty non-puzzle, three gears mesh together in pairs, and yet they can turn!
If you take three ordinary gears and put them together so that each gear meshes with the other two, then none of the gears can turn because neighbouring gears must turn in opposite directions. Triple gear avoids this problem by having the three "gears" arranged like linked rings - the gears then rotate along skew axes, and the opposite direction rule no longer applies (although see also Oskar van Deventer's Magic Gears
for another possible solution).
This is joint work with Saul Schleimer. We were inspired by another of Oskar's designs, his Knotted Gear
, which consists of two linked rings that gear with each other, and of course we wondered if it would be possible to do three linked rings!
I've made Triple Gear in two sizes, both of which work well.
Large version:Youtube video
Small version:Youtube video
File comment: Large Triple Gear
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File comment: Small Triple Gear
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