Sounds like a bicycle automatic transmission if I'm understand your
description.
Charlie
On Tue, Aug 2, 2016 at 9:21 AM, Chris Trask <christrask@xxxxxxxxxxxxx>
wrote:
> Every so often we have a bicycle show up in our shop that stands out
> for one reason or another. On Sunday a fellow showed up with an almost
> pristine 64cm 1980 Motobecane Grand Jubile, the only blemish being the rear
> wheel, which was not original. He had picked it up for $160 in a
> non-profit shop in Tucson. I was deep green with envy.
>
> But yesterday a bike arrived that towered above anything else I have
> seen in terms of uniqueness: A CSA Autobike. This ingenious contraption
> has an automatic rear wheel shifter that operates by way of three weights
> that slide along the spokes, which operate a trio of clevises, which
> operate a trio of pistons, and which then push a shifting ring outwards
> against the chain as the wheel goes faster, shifting the chain to a smaller
> sprocket. A conventional rear derailleur provides chain tensioning and
> jockying for down-shifting. The crankset is also a freewheel so that the
> chain can move while coasting so as to allow the wheel mechanism to shift
> down as speed decreases. Here are some photos:
>
>
> https://www.flickr.com/photos/64004640@N03/28642433541/in/dateposted-public/
>
>
> https://www.flickr.com/photos/64004640@N03/28720219755/in/dateposted-public/
>
>
> https://www.flickr.com/photos/64004640@N03/28720219715/in/dateposted-public/
>
>
> Chris the Moto(bécane)maniac
> ~~~ __o
> ~~~ _ <_
> ~~ (_)/(_)
> --
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