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Saw-tooth drives
Everyone is familiar with normal chain and sprocket drives:
http://bulgier.net/pics/bike/Antique...ed_Russian.jpg And most of us have seen ordinary shaft drives: http://www.nostalgic.net/bicycle399.htm There are also treadle drives of various kinds: http://i9.tinypic.com/4taqys4.jpg http://www.automag.be/IMG/jpg/Levocyclette.jpg Some bikes connect the front and rear sprockets with an intermediate sprocket: http://i12.tinypic.com/49j06bk.jpg *** But I haven't seen the following two oddball drives in Sharp's "Bicycles & Tricycles" or the early part of Berto's "Dancing Chain." Nor could I turn them up in a quick look through some old photo galleries. Probably they can be found in some more obscure books. *** For lack of a better term, I think of this first design as a sawtooth drive. Here's a single sawtooth drive: http://www.google.com/patents?id=uSk...=PP1&dq=618691 And here's a pair of double sawtooth drives, both from the same unsung genius: http://www.google.com/patents?id=fHN...=PP1&dq=609498 http://www.google.com/patents?id=thF...=PP1&dq=610157 And another double sawtooth: http://www.google.com/patents?id=tgx...=PA1&dq=642013 The eqquivalent of a chain guard seems like a good idea. *** I think of this related saw-tooth design as a bottle-opener drive: http://www.google.com/patents?id=GBB...=PP1&dq=512538 *** I'd love to find photos of such beasts, or even a modern bicycle that uses a long row of saw-teeth. Cheers, Carl Fogel |
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