Peugeot 1982 bottle dynamo

[Brucey]

I would imagine that a pair of semi-captive bolts (with square heads) are used with a bracket similar to the one I showed earlier. The bolt heads slide up and down in the channel so that the bracket/dynamo can be adjusted, and nuts are used to secure the bracket.

cheers

[PAB855]

Now it's all beginning to make sense. Your bracket pic and the idea of captive bolts changes everything. I was looking at lots of SOUBITEZ dynamo on eBay yesterday and couldn't see why none would fit. Your bracket is an example of the missing link. It also reminds me of frames with a short straight brazed on plate with a tapped hole to do the same job.
So I've now enough information to know what I should be looking for a bottle dynamo, bracket and fittings plus a wheel lock.

I should manage to source a bottle dynamo, but a wheel lock of that design doesn't appeal to me, so I will probably not look for one.

Even knowing what these plates are there for is very satisfying.

Very many thanks to everyone who took the trouble to reply.

Cheers

[backnotes]

There's a picture here http://www.blackbeardbicycles.co.uk/bur ... =image14pg that almost shows the arrangement Brucey suggests, and on a Peugeot too. Annoyingly, there's a spoke exactly lined up with the seat stay, but with a bit of imagination and zoom I can see a channel on the back of the seat stay, with the bottle dynamo mounted fairly directly onto that channel rather than onto a brazed on plate that sticks out forwards from the stay.

[PAB855]

Thanks banknotes. Your photo is helpful. I too had difficulty trying to get a decent picture from the RHS of the bike with spokes and a carrier in the way. In the end I got one, but it wasn't helpful.

At last the mystery is solved.

Cheers

[Brucey]

FWIW I suspect the arrangement will work better with an intermediate bracket (rather than bolting the dynamo to the rail mount directly), since it takes a fair amount of torque to prevent the single bolt from being loose enough to allow the dynamo to rotate on its mount, and that amount might damage the rail mount. By comparison the bolt onto an intermediate bracket can be as tight as you like, up to the limit of the fastener. Between the intermediate bracket and the rail mount, the two bolts don't need to be as tight to do their job.

cheers

[PAB855]

I agree Brucey. Your photo example would be safe and secure and wouldn't put stress on the brazed on fitment. I really like these features unique to a particular brand and it would be barbaric to damage them, besides, repairing the damage would be totally impractical.

My 1956 George Elrick frame has such a unique feature, it is two pairs of short pieces of tubing brazed to the rear of the seat stays to take the four short lends of the legs of a customised saddlebag rack which simply drops into them, no bolts. It's great and does the same job as all the crazy bag supports on the planet.

I digress, but it may be one of the few things you haven't heard of, but I doubt it!

Cheers

[Brucey]

I have seen all kinds of saddlebag supports but that is a new one on me. Any pictures?

cheers

[PAB855]

No pictures at the moment, but I will make an attempt after the weekend.

Cheers

[PAB855]

Photo of rear bag rack as mentioned earlier.
Had you heard of George Elliott?
Cheers

[PAB855]

George ELRICK.
Sorry!