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Re: Portable Unicycle

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rec.sport.unicycling
Published
26 January 2006
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13 February 2006
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  1. Keeping the idea of splitting at the crown (having two plates in contact
    with other) how about:

    The upper crown plate has pegs which locate into matching holes in the
    top of the fork legs. The two halves are kept together by a sturdy
    version of that over-centring snap clamp/closure (one at the top of
    each fork leg) that's used on cases and so forth - it probably has a
    technical name, but I don't know it. They're also used for making
    machining jigs and fixtures, and with the right geometry they can exert
    a huge force, but come undone with a flip of the finger (a split ring
    could stop that happening at an awkward moment).

    If you make a fortune, remember yer old mates, hey?

    John

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  2. PACO! Good to see you're still alive.
    Interesting idea. So far I'm with JC on the foldable joint idea.
    The tech exists in foldable b*cycles to make these joints easy to
    operate and not sacrifice the integrity of the frame in the process.
    If you can get this concept to work on raffies, let me know.

    As for the picture issue.
    If you attach only one pic per post, it will show up in your post.
    As soon as you attach two pics, they will be shown as links (as in your
    first post).
    A short-cut past this (that I picked up from Joe Marshall) is to attach
    as per normal and then to use the addy where the forum stores them in
    an IMG link in your post. That way you can have the pics where you want
    them in the text of your post and you won't only have to have the
    single pic at the end of your post.

    --
    GILD

    'three short gs and a long e-flat™'
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  3. Although the split crown would probably work, it might be much weaker
    since it's not a solid structure?? Maybe not..... Anyways, I like
    Obieone's idea on having like a 1-2 inch post coming out of the crown
    with a seat clamp on it. It will be 2-3 inches longer than the split
    crown idea but think it's a better idea.... One bolt vs. two bolts so
    it's quicker and easier. One drawback is that the seat clamp was down
    by the crown might get in the way for some tricks...

    Guess it also depends on how tall your seat post is. Cause if I split
    mine in half at the crown, my seat and seat post would be much higher
    than the wheel/fork assembly. But if it were split in half an inch or
    two above the crown, it'd be much closer in height to the wheel/fork
    assembly.

    Those are my opinions on this....

    --
    unicycle6869

    Jamey (formerly known as tuna6869)

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  4. I'm going to try thinking outside the box here...

    I think you need a bigger apartment.

    When I moved out of my parents house many years ago, I already had too
    many unicycles to fit into a closet. In the first place I lived (one of
    many bachelor pads), we parked some unicycles in the living room. It
    didn't help that two of my roomates also had multiple unicycles,
    including big wheels up to 56".

    Any room under the bed, or in other alternate locations? In an apt.
    with such limited space, it might be useful to raise your bed, creating
    a larger storage area underneath. Useful, even if not for the
    unicycles.

    Taking off pedals isn't such a bad thng, and can be done in 1-2 minutes
    with a single tool. Also it will make the unis much easier to stack
    than splitting the frame with the pedals still on. I know this from
    years of flying, and fitting lots of unicycles into cars. The key thing
    with the pedals is to thread them on carefully, so you don't damage the
    threads. Your fingers will get greasy every time you do this though.

    The split frame idea is fascinating. If you don't want to design and
    build your own, consider getting some Pichler unicycle frames. I found
    this picture with a little Google search:
    http://tinyurl.com/994kh

    These are essentially modular frames that clamp together. Seems like a
    great way to use multiple fork/wheel sizes, but so far nobody else uses
    it.

    Another approach could be quick-release bearing holders. Design a
    quick-release system to take the wheels off, and your resulting
    seat+frame can fit almost anywhere. But wheels with pedals on will
    still be space hogs. The easiest way to fit them together is to start
    by removing the pedals.

    --
    johnfoss

    John Foss
    "jfoss" at "unicycling.com" -- www.unicycling.com
    -----------------------------------------------

    "Idiot America—where fact is merely that which enough people believe,
    and truth is measured only by how fervently they believe it." --
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  5. Yeah I agree with John. The best way to go is to just remove your
    peadles and then possibly seat and seat post with a good quality quick
    realease. the folding crown or removable crown will only gain you a few
    inches at best and will require building new frames for all of your
    unicycles.

    See you at Moab!

    Dan )--(X)

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    Tellurider

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  6. Didn't a guy post on here quite recently about QR bearing holders he had
    invented?
    As far as I recall he had a list of the components he used and how much
    it cost, and photos of the finished article.
    I tried searching for the thread but can't find it, does anyone else
    remember it? (Or is it all in my head?😕 )

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  7. The problem with using quick release bearing holders is that there is
    grease down there. It's a dirty area of the unicycle. If you removed
    the wheel like that to be able to store the unicycle more compactly
    indoors you'd end up with grease and greasy dirt getting smeared on the
    floor, walls, and other objects in the closet. Not to mention getting
    grease on your hands and possibly your clothes.

    Same problem with removing the pedals, or removing the seatpost.
    There's grease in all those areas.

    The folding joint as used on folding bicycles makes a nice clean (clean
    as in not greasy) way to make the frame smaller.

    --
    john_childs

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  8. john_childs said:

    Same problem with removing the pedals, or removing the seatpost.
    There's grease in all those areas.

    True. The next "easy" thing to do is pull the seats. Assuming they're
    not Schwinns (I know you had one before), use quick-releases and pull
    the seats out. This may help a little, but doesn't do much with the
    pedal/width problem.

    --
    johnfoss

    John Foss
    "jfoss" at "unicycling.com" -- www.unicycling.com
    -----------------------------------------------

    "Idiot America—where fact is merely that which enough people believe,
    and truth is measured only by how fervently they believe it." --
    Charles Pierce, in Esquire Magazine
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  9. john_childs said:

    The folding joint as used on folding bicycles makes a nice clean (clean
    as in not greasy) way to make the frame smaller.

    My first thought was to make a folding crown, and it pretty much would
    serve as far as I can tell. I'm just wondering how well the folding
    systems would hold up to the forces unicycling would put on the joints
    (I really am wondering, as I have no experience with them). Also, does
    anyone know if I could buy the joint separately and then weld it into a
    frame?

    I also noticed on a folding bike website that they have 'folding
    pedals.' (http://www.dahon.com/d-pedals.htm) That would take care of
    the width problem (if they are strong enough to withstand uni forces).
    I still want to do something at the crown area, to shorten the thing
    overall without dealing with a lot of grease.

    Thanks for everyone's input. If I come up with a working
    design/prototype, I'll be glad to share the information as I have no
    interest in manufacturing these things; I just want to be able to stick
    a unicycle in my trunk, in a suitcase, or in a closet without much
    effort!

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  10. get the top part for the frame to fold like this:

    http://tinyurl.com/9sfat

    --
    carsonpalooza

    I just wear bike shorts...* the tight kind*
    That site is making me drool.
    -Dave aka fcwegnm0b
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  11. If u had the split crown, would it be used on all types of Unis, or just
    joyrides, as i call them, as i can see the break-away mechanism being a
    pain for Trials, etc.

    --
    silverfridge

    GOD SPEED!
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  12. I highly doubt folding pedals would be a problem at all, if you are
    hellbent on using 'unicycle pedals' miyata makes some folding pedals as
    well. I don't think the technology is any different so I would say go
    with whatever folding pedals you can find.

    --
    ntappin
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  13. silverfridge said:

    If u had the split crown, would it be used on all types of Unis, or just
    joyrides, as i call them, as i can see the break-away mechanism being a
    pain for Trials, etc.

    I'm thinking of building a 20" for freestyle, as I've never had one and
    always wanted one. And I wouldn't be using it on any high end trials
    frame, as structural integrity is actually necessary for that. But it
    would be nice to figure something out that would hold up to "joy
    riding" or even light offroading. I doubt the foldable pedals would
    hold up to 8 foot drops, so the frame wouldn't necessarily be the first
    thing to go!

    One of the nice things about the double crown design is that the
    downward vertical pressure would be distributed between two larger
    pieces, as would side to side movement. What I'm worried about is the
    different upward forces from jumps, pulling on the seat while
    descending steep hills, etc.

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  14. Paco,
    Hows married life? How did your trip to Canada go? Sounds like
    everything is in working order if your riding.😉
    Whats wrong with using unicycles as wall art? Solves two problems.
    Where to store the unicycle, and how to fill the empty space on the
    wall with little expence.

    --
    bugman

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  15. So here's the latest design ideas. I thought the hinge idea was a good
    one as then there's no pieces to lose. I kept with the dual crown idea
    as most force would be a downward force, and the only upward forces
    exerted would be from lifting while jumping or pulling up while going
    down a steep section.
    I put the hinge on the front as I think that's where most of the force
    would be applied while jumping. There's a latch of some sort on the
    back to keep the unicycle from folding while riding (although it might
    be fun to do some sort of seat out trick where the frame folds...).
    I think this design is simple enough to be realistic and should hold up
    against most normal unicycling forces. I need to build a prototype of
    the hinge section first to see if it even makes sense. Then I might
    build myself a frame. Does anyone know how I could go about doing
    that? Could a machine shop machine the hinge and weld the frame
    together?

    +-------------------------------------------------------------------+
    |Filename: 2DHingeSmall.jpg |
    |Download: http://www.unicyclist.com/attachment/11778 |
    +-------------------------------------------------------------------+

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  16. So here's the latest design ideas. I thought the hinge idea was a good
    one as then there's no pieces to lose. I kept with the dual crown idea
    as most force would be a downward force, and the only upward forces
    exerted would be from lifting while jumping or pulling up while going
    down a steep section.
    I put the hinge on the front as I think that's where most of the force
    would be applied while jumping. There's a latch of some sort on the
    back to keep the unicycle from folding while riding (although it might
    be fun to do some sort of seat out trick where the frame folds...).
    I think this design is simple enough to be realistic and should hold up
    against most normal unicycling forces. I need to build a prototype of
    the hinge section first to see if it even makes sense. Then I might
    build myself a frame. Does anyone know how I could go about doing
    that? Could a machine shop machine the hinge and weld the frame
    together?

    +-------------------------------------------------------------------+
    |Filename: 2DHingeSmall.jpg |
    |Download: http://www.unicyclist.com/attachment/11778 |
    +-------------------------------------------------------------------+

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  17. And here's how it would look with a wheel. My apologies for the
    simplicity of the designs. I'm doing them in Open Office, which isn't
    exactly the same as using a CAD program!

    +-------------------------------------------------------------------+
    |Filename: 2DHingeOpenSmall.jpg |
    |Download: http://www.unicyclist.com/attachment/11779 |
    +-------------------------------------------------------------------+

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  18. And here's how it would look with a wheel. My apologies for the
    simplicity of the designs. I'm doing them in Open Office, which isn't
    exactly the same as using a CAD program!

    +-------------------------------------------------------------------+
    |Filename: 2DHingeOpenSmall.jpg |
    |Download: http://www.unicyclist.com/attachment/11779 |
    +-------------------------------------------------------------------+

    --
    paco

    Every time I see this thread I wonder what happened to Paco's back.
    -John Childs
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  19. That does look like a neat concept. One thing to note is that when you
    fold it, the seat post will hit the tire so it's not going to fold
    completely in half. So I don't know how much space it will really save
    you??

    --
    unicycle6869

    Jamey (formerly known as tuna6869)

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  20. Why dont you just hang your unis on the roof with big hooks (look at the
    pics)

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