Toggle cam brakes?
 

[cross-posted from Mechanics when I realized I'm more likely to get an answer here.]

I was writing up the section on Roller cam brakes in Wikipedia and while looking for a good picture I ran across a thing called a "toggle cam" brake. I've never seen one - and Sheldon makes no mention - but from the few pics it looks like a one-sided roller cam design with a slaved arm (how?).

Anyone know how these operate? How common they were? Good or bad?


I also found a reference to a "sabre cam" design. I believe the front brake on this bike (click on the thumb of the front brake for a pic) is a sabre cam. Anyone know anything about them?

Thanks for the link! I've actually seen the site before yet lost track of it.



Just to help them along, here is what the webmasters need:

"im looking for pics of:

scott superbrakes
shimano dura-ace/600 ax calipers
jeay brakes (france, 1940s)
lefol calipers (france, 1940s/50s)
hooker tt brakes
and anything else unusual"

Toggle cam are kinda like Rollarcam, but with a modification so the brake cable doesn't has to come from the middle. Makes them ideal for small MTBs with a short seatstays where there is not much room. You easily recognize Toggle Cam as opposed to Roller Cam, because of one wheel instead of two and a half, modified cam.

My WTB Phoenix has a Toggle in front and a Roller hidden under the chainstays.

Tech explanation incl drawings >> http://www.retrobike.co.uk/forum/gal...2_itemId=45594


Pic of 600AX calliper >>

http://farm1.static.flickr.com/185/4...16f65b10c8.jpg

In fact AX brakes are very much like a Roller Cam.

So what about these odd calipers made by DiaComp?

http://i125.photobucket.com/albums/p...erLever2LR.jpg

Are they "Roller Levers"?

http://i125.photobucket.com/albums/p...Compdetail.jpg

Don't they automatically adjust for brake pad wear?

Bicycle Quarterly recently had an issue devoted to brakes, including Rebour illustrations of some of these models.