something old
04-15-14, 08:02 PM
#6
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Chain tensioner for a particular kind of braze on, works with a front derailler and ss rear?
04-15-14, 09:11 PM
#7
What??? Only 2 wheels?
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Looks like a Cyclo or early Simplex RD.
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04-15-14, 10:03 PM
#8
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got yourself a ~1930's TriVelox derailleur there, don't see them very often. the cogs, that is the gears, on this kind of bike slid back and forth on the axle with this device holding the chain in position making it jump from one gear to the next.
04-16-14, 08:51 AM
#9
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Fascinating how many ways were devised to skin this particular cat!
Am I correct that there is a free-floating plate between the first and second cogs that moved the cogs back and forth on the large axle?
Brent
Am I correct that there is a free-floating plate between the first and second cogs that moved the cogs back and forth on the large axle?
Brent
04-16-14, 11:36 AM
#10
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Burnfingers is correct.
I've seen 6 ways to add/change gears (counting the 100s of different derailleurs as one way and not counting changing sprockets/cogs/wheel size etc).
I've seen 6 ways to add/change gears (counting the 100s of different derailleurs as one way and not counting changing sprockets/cogs/wheel size etc).
04-16-14, 11:51 AM
#11
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Very cool!
I thought I had bought one of those a couple months ago (very terse ebay sale, I made a lowball last minute bid and won it, much to my surprise) but when it arrived, it turned out to be a TriVelox Model B, which is more conventional.
In the mean time, however, I'd already spent some time thinking about how to make this Tivelox derailleur work. I believe you could weld together a stack of 10 or 11 speed cassette cogs and have them slide back and forth on the appropriate freehub; you could have five or six speeds. You'd have to rig up a secondary mechanism to move the cassette, of course. Get creative!
I thought I had bought one of those a couple months ago (very terse ebay sale, I made a lowball last minute bid and won it, much to my surprise) but when it arrived, it turned out to be a TriVelox Model B, which is more conventional.
In the mean time, however, I'd already spent some time thinking about how to make this Tivelox derailleur work. I believe you could weld together a stack of 10 or 11 speed cassette cogs and have them slide back and forth on the appropriate freehub; you could have five or six speeds. You'd have to rig up a secondary mechanism to move the cassette, of course. Get creative!
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04-16-14, 04:55 PM
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If anyone's curious I found scans of the actual patent for this derailleur design;
https://www.disraeligears.co.uk/Site/...ox_scan_5.html
04-16-14, 08:37 PM
#14
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While it's way too heavy for modern use--the advantage at the time(1931) was it didn't wear out the chain as in other derailleur designs of the same time. Chains were very expensive at that time BTW. trivelox was used mostly on tandems---this one will be used on a 1935 Sun tandem--that was made for this set up.
04-17-14, 07:33 AM
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Pretty good! I made this quadrant shifter for it, extremely primitive, it only has two positions. Works very nicely. 
It is a bit heavy, but I'm amazed how well the TriVelox shifts. I need to get a better tension spring, as you can see.
I'm trying to get proper decals for it so I can have a more durable paint job done. The existing paint and graphics, a temporary job I did three years ago, has not held up. But that's okay; it shows how much I like to ride this bike.
It is a bit heavy, but I'm amazed how well the TriVelox shifts. I need to get a better tension spring, as you can see.
I'm trying to get proper decals for it so I can have a more durable paint job done. The existing paint and graphics, a temporary job I did three years ago, has not held up. But that's okay; it shows how much I like to ride this bike.
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04-17-14, 10:33 AM
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Well done on the Fothergill!
Obrentharris, you're right about the "plate", what I would call a shifting fork, borrowing from motorcycle transmission terminology and method of sliding gears inside an MC gearbox.
It's too bad that the fork somewhat rubs against the rotating cogs all of the time, and the cable exit is pretty un-graceful, but I see potential here.
Shimano actually used this sliding-cassette technology inside of their fully-enclosed, bb-mounted downhill transmission units about 10-15 years ago!
Obrentharris, you're right about the "plate", what I would call a shifting fork, borrowing from motorcycle transmission terminology and method of sliding gears inside an MC gearbox.
It's too bad that the fork somewhat rubs against the rotating cogs all of the time, and the cable exit is pretty un-graceful, but I see potential here.
Shimano actually used this sliding-cassette technology inside of their fully-enclosed, bb-mounted downhill transmission units about 10-15 years ago!
04-17-14, 12:39 PM
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1. Standard FD/RD "dancing chain"
2. Cambio Corsa
3. Flip-flop hub (different gearing on each side)
4. The above-mentioned TriVelox setup
5. IGH
6. Wasn't there a crazy one where pedaling backwards made a different ratio?
7. I bet there's more, depending on how you count.
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04-17-14, 01:21 PM
#19
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I wasn't counting changing wheel size or changing sprockets/cogs but counting those as 1&2
3--all derailleurs that move the chain from cog to cog
3 Trivelox--move the cogs under the chain
4 Early 'mountain" gear---used a motorcycle type tran ahead of the rear wheel
5---IGH---sturmey archers types
6 internal geared bottom brackets
7 retro-direct---back pedal for second gear
8devenci ball and cone IGH (no gears)
also something caller the Bricklin hand gear that rocked the handle bar and drove the front wheel---I don't really count that as changing a gear---more like a way of drive--levers also fall in this category
3--all derailleurs that move the chain from cog to cog
3 Trivelox--move the cogs under the chain
4 Early 'mountain" gear---used a motorcycle type tran ahead of the rear wheel
5---IGH---sturmey archers types
6 internal geared bottom brackets
7 retro-direct---back pedal for second gear
8devenci ball and cone IGH (no gears)
also something caller the Bricklin hand gear that rocked the handle bar and drove the front wheel---I don't really count that as changing a gear---more like a way of drive--levers also fall in this category
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