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Innovative brake in old magazine.

Old 03-10-22, 04:44 AM
  #1  
EZgears
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Innovative brake in old magazine.

Anyone remember reading an article about a new kind of break? This was back in the 90's I think. Might have been in popular science or popular mechanics. Someone came up with basically a groove like a pulley that went around the circumference of a rim. In this groove there was a Kevlar cord that went clear around and when you pulled the break lever it tightened the cord in the groove causing friction to stop the bike. It never did catch on but it was supposed to stop a bike very quickly.
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Old 03-10-22, 05:37 AM
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Give me a break. I can't see how a brake like that would be a breakthrough in brake design over the brakes of that era. But it would be interesting to see the article to break it down. But that brake discussion would be a welcome break from the rim brake vs. disc brake debates.
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Old 03-10-22, 05:59 AM
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Sounds like a failure and more trouble than it's worth, just like an AWD bicycle.
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Old 03-10-22, 06:31 AM
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I remember seeing an article about it. It was a kevlar band brake. The big problem was, it required a special rim, one with an extra track for the band. It's not hard to figure why it never caught on.
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Old 03-10-22, 06:35 AM
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Hmm, I’m surprised it didn’t catch. I wonder why the innovations slowed down.
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Old 03-10-22, 06:37 AM
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Someone should start an "innovations that flopped" thread. Then we can link it whenever someone posts the "they laughed at the Wright Brothers" cliche.
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Old 03-10-22, 06:38 AM
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Originally Posted by Ghazmh View Post
Hmm, I’m surprised it didn’t catch. I wonder why the innovations slowed down.
IKR
A Kevlar brake sounds like such a bulletproof idea.
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Old 03-10-22, 07:08 AM
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Originally Posted by livedarklions View Post
IKR
A Kevlar brake sounds like such a bulletproof idea.
I see what you did there.
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Old 03-10-22, 07:18 AM
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I've waited all my life for a big break and I give up
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Old 03-10-22, 07:54 AM
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Thread title fixed.
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Old 03-10-22, 07:59 AM
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Band brakes (and clutches) are hardly innovative. They've been used for various applications since the start of the industrial revolution.
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Old 03-10-22, 08:23 AM
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Originally Posted by livedarklions View Post
IKR
A Kevlar brake sounds like such a bulletproof idea.
If it would have been made of Nomex it probably would have spread like a wildfire.
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Old 03-10-22, 09:06 AM
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Here's the article:
https://books.google.com/books?id=l3...icycle&f=false
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Old 03-10-22, 09:49 AM
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Maybe the publication should have been called Unpopular Science.

John
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Old 03-10-22, 01:35 PM
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Originally Posted by EZgears View Post
Anyone remember reading an article about a new kind of break? This was back in the 90's I think. Might have been in popular science or popular mechanics. Someone came up with basically a groove like a pulley that went around the circumference of a rim. In this groove there was a Kevlar cord that went clear around and when you pulled the break lever it tightened the cord in the groove causing friction to stop the bike. It never did catch on but it was supposed to stop a bike very quickly.
Is this a rest break or bike brake?
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Old 03-10-22, 07:13 PM
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Probably wouldn't work very well in wet conditions.
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Old 03-10-22, 07:48 PM
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Tesla needs to start making self-braking and self-shifting bicycles. All you need to do is just hold the handlebars and pedal ....and the software will decide when to apply the brakes and when to shift your gears.
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Old 03-10-22, 08:19 PM
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It’s just a larger version of the strap brake found on most shopping bikes in the Asian market. It works like a drum brake, but compresses the drum from the outside instead of expanding brake shoes on the inside. It’s simple and inexpensive to manufacture.
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Old 03-10-22, 08:27 PM
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I agree with other posts that the special rim was probably a deterrent. That and I imagine that the Kevlar cord caused a lot of friction, which causes heat, which causes tire pressure fluctuations. The same can be said for rim brakes but they only touch a 2 inch section of the rim. They don't go around the whole rim.
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Old 03-11-22, 09:46 AM
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Originally Posted by 50PlusCycling View Post
It’s just a larger version of the strap brake found on most shopping bikes in the Asian market. It works like a drum brake, but compresses the drum from the outside instead of expanding brake shoes on the inside. It’s simple and inexpensive to manufacture.
Yup. Came here to say this. I can't post links yet but Saint Sheldon has a page about this design: sheldonbrown.com/band-brakes.html
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Old 03-11-22, 11:18 AM
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"Innovative brake in old magazine."

Maybe if compared with dragging your feet on the ground or having a wood block rub on the tire.
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Old 03-11-22, 11:38 AM
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Originally Posted by Velogoth View Post
Yup. Came here to say this. I can't post links yet but Saint Sheldon has a page about this design: sheldonbrown.com/band-brakes.html
That's interesting, it should be more impervious to weather than a band brake on the outside of the rim. Band brakes are commonly used on exercise bikes and have been for many decades, so it was hardly a ground-breaking innovation in any case.
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Old 03-11-22, 01:51 PM
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Originally Posted by surveyor6 View Post
Probably wouldn't work very well in wet conditions.
Article posted upthread says it works better in the wet.
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Old 03-11-22, 02:46 PM
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Originally Posted by chaadster View Post
Article posted upthread says it works better in the wet.

Must say, I don't have enough experience with wet straps of kevlar to know if that's credible.
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Old 03-11-22, 02:52 PM
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Originally Posted by drlogik View Post
I agree with other posts that the special rim was probably a deterrent. That and I imagine that the Kevlar cord caused a lot of friction, which causes heat, which causes tire pressure fluctuations. The same can be said for rim brakes but they only touch a 2 inch section of the rim. They don't go around the whole rim.
All brakes cause a lot of friction if they're any good, that's the point. Wouldn't spreading all this friction over the entire circumference actually allow for more heat loss due to radiation?
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