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U- Joint for trailer

Old 06-15-13, 12:37 PM
  #1  
jawnn
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U- Joint for trailer

can any one tell me where to get a 1.125" thread steer tube?

This may need to be held together by threaded rod on the out side. But it could be done on the inside if there is a slot for the smaller steer tube to turn.

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Old 06-16-13, 10:14 AM
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Even enlarged (not enough) it was difficult to "read" the drawing. From what I could tell, it appears there may be some design issues with the hitch system. Maybe a better/larger pic?

I couldn't really tell how it attached to the bike, but appears as there's no accommodation for side swing, as well as the tongue being too short.
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Old 06-16-13, 11:12 AM
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can any one tell me where to get a 1.125" thread steer tube?
You dont need a thin wall Tubing for this project,
.. thicker is going to leave more wall thickness after cutting the threads into it.

Thread the tubing on the lathe.. If you don't have one Hire the work done.

Last edited by fietsbob; 06-16-13 at 11:16 AM.
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Old 06-17-13, 07:40 AM
  #4  
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Ceeway has 1.125 threaded tubes on their site. Can't comment on the drawing, it's too small.
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Old 06-17-13, 11:56 AM
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the horizontal steer tube will rotate the vertical one also the atachment to the axle will move up and down like the BOB trailers.

it will use head set bearings.

try this link to the scaned image


http://nhojyesdnil.files.wordpress.c...6/u-joint2.jpg
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Old 06-17-13, 12:42 PM
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You could use Nylon /Teflon Bushings rather than actual headsets Of course ..

Even a Grease layer between rotating tube surfaces would do if you keep up the maintenance.
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Old 06-17-13, 02:31 PM
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Is the drawing in a plane parallel to the ground? Is the trailer one or two wheels?

Last edited by tuz; 06-17-13 at 02:37 PM.
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Old 06-17-13, 04:24 PM
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So this will be like the trailer IraRyan did for NAHBS a few years back?
Pretty sure he used threadless headsets with the bearing preload set with spacers, like a Jones fork.
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Old 06-17-13, 04:39 PM
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Originally Posted by tuz View Post
Is the drawing in a plane parallel to the ground? Is the trailer one or two wheels?
has to be 2 wheels or it would fall over. I think I would just use 1 1/8" threadless. I'm trying to think why you couldn't use the top half of a headset on both ends and failing to see a problem.
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Old 06-19-13, 01:31 PM
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star nuts?

I need something to hold the top and bottom together. Threaed rod inside would require a slot int he horzontal steer tube so it can still rotate.

I have decided that it needs a star nut in the top half of the verticle head tube. But that means using a head tube made of a 1.25 inch steer tube.

Will the one and one 8th inch steer tube fit inside a 1.25" steer tube and still use the head set for it.??

Last edited by jawnn; 06-19-13 at 01:34 PM.
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Old 06-19-13, 01:35 PM
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I need a photo of that one.

Originally Posted by Live Wire View Post
So this will be like the trailer IraRyan did for NAHBS a few years back?
Pretty sure he used threadless headsets with the bearing preload set with spacers, like a Jones fork.
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Old 06-19-13, 02:00 PM
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Old 06-19-13, 03:18 PM
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Originally Posted by jawnn View Post
Will the one and one 8th inch steer tube fit inside a 1.25" steer tube and still use the head set for it.??
no, 1 1/8" steerers and headsets require 1 3/8" tubing. Because of the advent of tapered steerers, it is now possible to buy the top half of a 1 1/8" headset by itself. I would use a star nut on both ends. That's what the Ira Ryan setup uses. The steerer is a separate piece that slides in, is bolted by collars, and has star nuts securing it while preloading the bearings.

On edit: It looks like I was wrong and he has a crown race on the bottom. You could do it either way

Last edited by unterhausen; 06-19-13 at 04:14 PM.
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Old 06-19-13, 04:55 PM
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Originally Posted by Cynikal View Post
Lets see, how can I spend the most $ possible on my little trailer without including precious metals or gems? Oh wait, I have an idea!
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Old 06-19-13, 05:07 PM
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It was a show bike from Portland. I think it's in the Portland City Code to use CK headsets for everything.
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Old 06-19-13, 06:25 PM
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ya, the headset was the least expensive part in that picture. You can use the cheapest possible headset for this application and it will work fine
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Old 06-20-13, 10:35 AM
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the way I read the OP's diagram...please correct if I am misreading. is that his design is similar to the nahbs bike pic but not the same.

It looks like the long tube will be parallel to the ground, not perpendicular.

the single tube is connected to the trailer and the connection to the bike is stays from both ends of the long tube

What is the benefit of such a complex design? it seems like there are a lot of proven simpler designs out there http://www.bikesatwork.com/bike-trailers/features

and it seems like it needs another axis to handle full range of motion (like sway?)

what am i missing?

wh
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Old 06-20-13, 10:59 AM
  #18  
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+1 on the rod-end bearing hitches. They offer all the needed rotational freedom in a small neat unit.
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Old 06-20-13, 03:00 PM
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This is the one, but how does the lateral tube hold the trailer?

Just a star nut? or a threaded rod welded inside that sticks out through the head set?
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Old 06-28-13, 01:38 PM
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I just welded a 1/2" or 3/4" socket u-joint to make my hitch welded to a plate that bolted to the frame with appropriate sized u-bolts. I think I spent upwards of ten bucks on the hardware and it worked brilliantly... the rest of my trailer kinda looked like this re-cycle.org one.
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Old 06-28-13, 03:05 PM
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I probably would do something similar to what the OP wants to do, but use standard parts. If I were going to use a u-joint, I think the ones for rear wheel drive cars are pretty cheap.
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