Subject:
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Re: Pneumatic Questions
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 20 Nov 2005 19:13:53 GMT
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Viewed:
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4817 times
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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Chio Siong Soh wrote:
> > In lugnet.technic, Kevin L. Clague wrote:
> > > It is possible to combine multiple switches into a release-free switch,
> >
> > Ahhh, I would love to see it done :-)
> >
> > CS
>
> I'm not at home, so I can't lookup the history on this in my LEGO notebooks. I
> think Doug Carlson invented this.
>
> I rederived it today, because I knew it wasn't too complicated.
>
> It involves four switches and four T's. The four switches form two pairs.
>
> The two switches are mechanically linked in a way that the used ports never
> release. By hooking together the center ports of the pair, pressure can go
> through one and only one switch at a time.
>
> By hooking two of these pairs together, you can allow a contained release.
>
> http://www.brickshelf.com/gallery/kclague/Computing/4port.jpg
>
> Ports 1 and 4 are identical in function. One serves as the input, the other the
> release port. Ports 2 and 3 control the piston.
>
> Kevin
I found this picture on my brickshelf account. It shows the lego geometry
needed to implement the four port switch. The hoses are not right, but the
switch positions and lever linkages are correct.
http://www.brickshelf.com/gallery/kclague/Computing/p6050069.jpg
Kevin
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Message is in Reply To:
 | | Re: Pneumatic Questions
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| (...) I'm not at home, so I can't lookup the history on this in my LEGO notebooks. I think Doug Carlson invented this. I rederived it today, because I knew it wasn't too complicated. It involves four switches and four T's. The four switches form two (...) (19 years ago, 20-Nov-05, to lugnet.technic)
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