Subject:
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Re: Pneumatic Linear-to-cyclical Converter
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 11 Jul 2003 12:19:02 GMT
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Viewed:
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662 times
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In lugnet.robotics, Mike Thorn <buachaille@neo.rr.com> wrote:
> Yesterday I was helping my mother clean out part of the basement and I
> saw the excersize bike that's been down there for years and years and
> years and years and it occurred to me then that it had the perfect
> mechanism for converting linear to cyclical in a pneumatic application.
> It has two pedals connected by ("Technic-ally" speaking) beams to
> vertical beams that serve as upper-body workout. When you pedal this
> contraption, the handles alternate back and forth. They don't move up or
> down hardly at all and it struck me (okay, so to me it was a flash of
> inspiration. You veteran pneumaniacs probably are sighing at yet another
> rehash of a truly elementary principle) that this horizontal motion
> would be perfect for a pneumatic vehicle. So today I threw together a
> rough CAD of it to give y'all the idea. ('rough' is the operative word
> here) It's located at http://www.lmsm.info/lineartocyclical.ldr if you'd
> like to take a look.
>
> As Kevin so familiarly says, PLMTWYK. ;-)
Hi Bauchaille,
I'd guess that you envision hooking the pistons to the top of each handlebar,
along with switches that make the pistons altername from open to closed and
back. This would indeed make the pulleys turn. The trick here is the fact that
the pistons effectively attach to the large pulley offset by 90 degrees (the
role of the blue cams).
If you were to replace the cams with large pulleys, and hook the pistons
direcly to the then you would have the same mechanism but in a more compact
form. This is the key to pneumatic engines/motors as can be seen:
http://www.brickshelf.com/gallery/kclague/Pneumotors/reversible-motor_s_0_02.jpg
Good job recognizing this fundamentally important mechanism.
Kevin
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Message has 1 Reply:
 | | Re: Pneumatic Linear-to-cyclical Converter
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| (...) Yep, that's it. Actually, the switches could perhaps be located somewhere else? I'm not familiar enough with pneumatic engines to know how the switch reversal mechanism works. (...) Right. Actually, in the model of this I'm working on, I did (...) (21 years ago, 11-Jul-03, to lugnet.robotics)
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Message is in Reply To:
| | Pneumatic Linear-to-cyclical Converter
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| Yesterday I was helping my mother clean out part of the basement and I saw the excersize bike that's been down there for years and years and years and years and it occurred to me then that it had the perfect mechanism for converting linear to (...) (21 years ago, 11-Jul-03, to lugnet.robotics)
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