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Idea for mechanism in Nat. Treasure 2

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Project by DaveCarlson posted 05-26-2008 07:35 PM 2210 views 6 times favorited 5 comments Add to Favorites Watch
Idea for mechanism in Nat. Treasure 2
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Well, I have to say that the desk was intriguing. So, I spent some time devising a mechanism to allow a combination of drawer pulls to open another compartment. In the illustration, I only show one piece, but the strength of the magnets could allow for multiple drawers.

Here is an explanation:

The eye hook on the back of the drawer is attached to a length of twine or other similar material. The twine goes behind a metal rod, and into a groove in the back of the case. Along this groove will ride a small block of wood containing a neodymium magnet at a specified point. The other end of this is attached to a tensioning device in order to retract the string when the drawer closes.

When the magnet rides over the point, it will pull another magnet attached to a rod up, and out of a hole in the “secret compartment”, allowing it to open. This is similar to tumblers, and it could be adapted to either vertical or horizontal drawers easily.

Let me know what you think, and any suggestions to this device. Thanks, guys.

-- -- I can't make THAT, but I can make some damn fine sawdust!





5 comments so far

View pyromedic602's profile

pyromedic602

164 posts in 2501 days


#1 posted 05-26-2008 09:36 PM

Sounds like an interesting idea. Can’t wait to see you built something incorporting the mechanism.

-- Pyromedic602, free wood is always good wood

View Doug S.'s profile

Doug S.

295 posts in 2461 days


#2 posted 05-26-2008 11:02 PM

Interesting project. I think I’d try something like fine braided wire rather than twine. The tensioning device might be the trickier part. A spring pulling laterally would have to have just the right amount of pull vs extension. Anything too strong might make opening the eyebolt drawer stick. If the other end could just be weighted and pull downward, that might be simpler.

Edit:
Incidently, if you dont already know this, these guys are a good mag supplier.
http://www.kjmagnetics.com/

-- Use the fence Luke

View DaveCarlson's profile

DaveCarlson

10 posts in 2406 days


#3 posted 05-27-2008 01:55 AM

This is true. The hanging idea is good, but the things I’m trying to avoid are keeping the magnet in the groove, and having things knock around inside, tipping off the presence of this device. Hanging elements would bang around when the desk is moved. I’m actually thinking of another method of doing this that wouldn’t require eye hooks or string or any of that. I’m always trying to improve my ideas. I’ll post when it’s more concrete… BTW, I love the quote. “Use the fence, Luke…”

I was also thinking of using United Nuclear for the magnets. Something about a company that sells a magnet that is powerful enough that it will fly uncontrollably across a room that I love… :)

http://www.unitednuclear.com/magnets.htm

Look for Supermagnet #33. 800 lbs of pull. A little overkill for the desk, but what the hell, right? ” Uses include magnetic steering of nuclear particles in accelerators…” I love it!

-- -- I can't make THAT, but I can make some damn fine sawdust!

View Doug S.'s profile

Doug S.

295 posts in 2461 days


#4 posted 05-27-2008 02:46 AM

Here’s something that came to me after posting earlier, only because I was moving my jointer and got to thinking about the porkchop guard spring. Maybe there’s a way you could put a 2nd metal rod at the RH side and have it wind thru a spring like a jointer guard with the string or wire tied through a hole in the rod???

-- Use the fence Luke

View DaveCarlson's profile

DaveCarlson

10 posts in 2406 days


#5 posted 05-27-2008 02:54 AM

I like the idea, but I would be iffy about it, especially if the drawer is #9 or something. Then it would pull the spring, and over time it wouldn’t work right. That, and too much tension will alert the user to its presence. I’m thinking now along the lines of a rocker installed on the bottom that will work like a lever to lift the tumbler…

-- -- I can't make THAT, but I can make some damn fine sawdust!

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