Gosh darn- Demultiplicateurs is the right spelling.
Joe
> I would say this comes down to the Simplex derailleurs (such as the
Prestige
> and Criterium) requiring less cable pull. The plastic Simplex levers had
a
> small "spool" diameter to the point where could not really work well with,
> for example, a Suntour (which required rather large cable travel). The
> demultiplacateur reduces the cable travel to allow a larger spool lever to
> interface with a derailleur requiring smaller cable travel. One data point
> is that the demultiplacateur came in the bag with NOS Simplex bar-cons
> (Cross-Commandes) I bought about a year ago from the seemingly endless
> supply of Ron Boi. I bet the bar-cons pull a fair amount of cable although
I
> can't get at the bike they (and a demultiplicator).are on to check right
> now.
>
> The relais demultiplacateur de transmission avec cable is Simplex Ref.
2343.
> As shown in the Cross-Commandes (Ref. 2615) instruction sheet, the middle
of
> the bellcrank travel would be at the roughly at the point of each cables
> tangency to the arc about the bellcranks center when set up properly- the
> ratio would change very little, if at all, since the changes in the length
> of "A" and "B" would be roughly proportional as the crank were rotated
away
> from the center position.
>
> Joe Bender-Zanoni
> Great Notch, NJ
>
> ----- Original Message -----
> From: "Mark Bulgier" <mark@bulgier.net>
> To: "'r cielec'" <teaat4p@yahoo.com>; <Classicrendezvous@bikelist.org>
> Sent: Wednesday, January 01, 2003 1:21 AM
> Subject: RE: [CR]Demultiplicators...
>
>
> > If you will kindly turn your attention to
> > http://bulgier.net/
> >
> > Please note that since radius "A" is larger than radius "B", point "1"
> will
> > move farther for a given amount of rotation than point "2"
> >
> > Since "1" is attached to the shift lever and "2" is attached to the rear
> > derailleur, you'll have to move the shift lever farther than normal to
> move
> > the rear derailleur a certain amount.
> >
> > Since "A" and "B" are changing at different rates through the range of
> > motion of the bellcrank, the ratio between the two isn't a constant and
> even
> > the average ratio can vary depending on initial conditions - where you
> > position the bellcrank to begin with. It probably doesn't change enough
> to
> > worry about though; and most people position it to start and end roughly
> > equal angles from the neutral angle between chainstay and downtube. I
> don't
> > see any advantage to setting it up substantially different from this.
> >
> > But the most important thing is...... Happy New Year!
> >
> > Mark Bulgier
> > Seattle, Wa
> > USA
> >
> >
> > > -----Original Message-----
> > > From: r cielec [mailto:teaat4p@yahoo.com]
> > > Sent: Tuesday, December 31, 2002 7:49 PM
> > > To: Classicrendezvous@bikelist.org
> > > Subject: Re: [CR]Demultiplicators...
> > >
> > >
> > >
> > > Is there a photograph or illustration of this device ?
> > > Richard Cielec
> > > Chicago, Illinois
> > > Philcycles@aol.com wrote:
> > > In a message dated 12/30/02 6:04:03 PM, sachs@erols.com writes:
> > >
> > > >This may just prove that logical arguments aren't the story,
> > > and that Phil
> > > >
> > > >is right.
> > >
> > > The "feel" thing comes direct from a Simplex ad.
> > > Phil Brown
> > > NoHo, Ca
> > > _______________________________________________
> > >
> > >
> > > ---------------------------------
> > > Do you Yahoo!?
> > > Yahoo! Mail Plus - Powerful. Affordable. Sign up now