Follis beborex brakes

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Brucey
Posts: 41529
Joined: 4 Jan 2012, 6:25pm

Follis beborex brakes

Postby Brucey » 31 Jul 2018, 10:42am

came across these whilst looking for something else, and thought they looked interesting. I don't think they have been mentioned here before, either. They are a kind of modified side-pull brake that has a 'rising rate' linkage, i.e. an increasing mechanical advantage through the stroke.

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First shown in 1948, they were apparently sold by Ron Kitching for many years, still being advertised as an 'innovation' as late as 1970 (see p15 of the 1970 catalogue, available via the VCC library, for a higher resolution version)
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also
http://www.classiclightweights.co.uk/components/beborex.html
http://velobase.com/ViewComponent.aspx?ID=7c4c9909-02d7-47c4-ac60-b8c73594d1f3&Enum=117
in French but well worth a look;
https://anciensveloslyonnais.weebly.com/follis---joseph-follis---marcel-follis.html

The brake works by the extra link coming closer to the horizontal as the brake is applied, increasing the lengthwise thrust in the link, which bears against the caliper (via pivot at one end and a little wheel at the other) in such a way as to increase the brake power.

It wasn't the only brake invented and patented by the Follis brothers; there is (presumably later?) version with a more complex articulated linkage in the last of the links above.

Many such rising rate linkages in brakes (campag deltas being a case in point) tend to abruptly stop working in your favour as the brake wears. Indeed the brake may stop working altogether; these brakes may be no exception. However I note that in this design, if the extra link could have a hard stop built into it (I don't know if it does or does not in fact) then at least you might be left with basic sidepull brake action if the extra link goes near to horizontal, i.e. some brake rather than none....

The brake also has a fairly nifty QR action, although it seems likely that the QR could be knocked 'on' if the steering swings rightwards so that the caliper hits the frame.

I have never seen a set in the flesh; anyone have any comments about how they worked in practice? I wonder if it is an idea that still has some value today?

I note that because the arms rotate about a common pivot, the brake is centred by a spring (like a normal SP brake, i.e. not very well with short cable runs) but that the same linkage could work with a DP brake design instead, and that whilst the centring wouldn't be 100% stable (as per DP brakes) it would at least be predictable.

cheers
Last edited by Brucey on 5 Aug 2018, 4:20pm, edited 1 time in total.
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Brucey
Posts: 41529
Joined: 4 Jan 2012, 6:25pm

Re: Follis beborex brakes

Postby Brucey » 5 Aug 2018, 4:16pm

no-one seen or used these, then?

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

reohn2
Posts: 40208
Joined: 26 Jun 2009, 8:21pm

Re: Follis beborex brakes

Postby reohn2 » 5 Aug 2018, 5:40pm

Are they better than discs :wink:


PS,sorry couldn't resisc :)

PPS,I read the title as Zaphod Beablbrox :?
Last edited by reohn2 on 5 Aug 2018, 6:19pm, edited 1 time in total.
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NetworkMan
Posts: 715
Joined: 25 Aug 2014, 11:13am
Location: South Devon

Re: Follis beborex brakes

Postby NetworkMan » 5 Aug 2018, 5:48pm

reohn2 wrote:
............ PPS,I read the title as Zaphod Beablbrox :?

No, he's his semi-cousin. :wink:
... If I remember the terminology correctly.

rjb
Posts: 4146
Joined: 11 Jan 2007, 10:25am
Location: Somerset (originally 60/70's Plymouth)

Re: Follis beborex brakes

Postby rjb » 5 Aug 2018, 5:50pm

They look a little homemade. Come on Brucey bolt a guide onto your brake shoe and add a link to the arm with a roller. Report back if you are not hospitalised. :lol:
At the last count:- Peugeot 531 pro, Dawes Discovery Tandem, Dawes Kingpin, Raleigh 20, Falcon K2 MTB dropped bar tourer, Longstaff trike conversion on a Falcon corsa. :D

reohn2
Posts: 40208
Joined: 26 Jun 2009, 8:21pm

Re: Follis beborex brakes

Postby reohn2 » 5 Aug 2018, 6:11pm

We must stop this pivot it gets to two(dual)pages,get a grip folks and lever it out before we cause anymore friction,and things get heated :shock:
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reohn2
Posts: 40208
Joined: 26 Jun 2009, 8:21pm

Re: Follis beborex brakes

Postby reohn2 » 5 Aug 2018, 6:16pm

NetworkMan wrote:
reohn2 wrote:
............ PPS,I read the title as Zaphod Beablbrox :?

No, he's his semi-cousin. :wink:
... If I remember the terminology correctly.

From "Tour bikers ride on a Galaxy" perhaps? :wink:
Last edited by reohn2 on 6 Aug 2018, 8:34pm, edited 1 time in total.
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Colin Stanley
Posts: 315
Joined: 12 May 2007, 7:05pm
Location: Somewhere in Kent

Re: Follis beborex brakes

Postby Colin Stanley » 5 Aug 2018, 9:09pm

It was a long time ago (1956 ish) when I went to look at a secondhand bike. It had Beborex brakes. I thought it looked like a strange mechanism for a side pull. In the end I settled for a s/h 21inch Witcomb with pecil thin rear stays.

brumster
Posts: 314
Joined: 8 Sep 2009, 7:50pm

Re: Follis beborex brakes

Postby brumster » 8 Nov 2019, 8:32pm

Good old Brucey ! - I've never heard of these brakes, but have one on a recently purchased Jack Taylor.
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Brucey
Posts: 41529
Joined: 4 Jan 2012, 6:25pm

Re: Follis beborex brakes

Postby Brucey » 9 Nov 2019, 11:50am

rjb wrote:They look a little homemade. Come on Brucey bolt a guide onto your brake shoe and add a link to the arm with a roller. Report back if you are not hospitalised. :lol:


I did think about such a modification but it isn't quite as simple as that; for the whole arrangement to work the top arm needs to be slightly less offset (from the bike centreline) than normal and the lower arm slightly more offset. If not the cable run would have to be angled and possibly the link would have to be shorter than ideal, and/or the brake would only work on fairly narrow rims. But I would anticipate that is exactly how prototypes were first made.

cheers
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NATURAL ANKLING
Posts: 12358
Joined: 24 Oct 2012, 10:43pm
Location: English Riviera

Re: Follis beborex brakes

Postby NATURAL ANKLING » 9 Nov 2019, 12:28pm

Hi,
interesting, on the failsafe stop.
I see the cable is in front of the arm, so it will lock onto the underneath of the arm, when out of adjustment so defaults to normal.

Keep em coming :)
NA Thinks Just End 2 End Return + Bivvy
You'll Still Find Me At The Top Of A Hill
Please forgive the poor Grammar I blame it on my mobile and phat thinkers.

brumster
Posts: 314
Joined: 8 Sep 2009, 7:50pm

Re: Follis beborex brakes

Postby brumster » 10 Nov 2019, 8:25pm

I guess the chances of me finding a matching rear Beborex caliper for my Jack Taylor will be rather slim?

brumster
Posts: 314
Joined: 8 Sep 2009, 7:50pm

Re: Follis beborex brakes

Postby brumster » 29 Nov 2019, 8:03pm

Now on eBay should anyone fancy a bid.
https://www.ebay.co.uk/itm/254437821866#shpCntId