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Lets get right to buisness. This device is installed to the doornob of your door and a place where it hits if pushed into the wall. both of these are magnetic, but the thing that makes this halfbaked idea is that the polarity on the place where the doornob hits the wall can be changed because it is an
electrig magnet. If you can have a magnet strong enough to do this, when charged positively, the doornob magnet would attract towards this spot, therefore, opening the door. The polarity can be charged negatively to repel the door closed. The doors magnet would have a power switch so bugulars would not use a powerful magnet to repel it. The doornob being two-sided, could have a positive flow on the outside and negative on the inside. or vica versa. And that's it!
Electromagnetic Door Release
http://www.sargentl...il.php?line_id=232&
Electromagnetic door releases are commonly installed on normally open fire doors in office and commercial buildings. You don't see many powerful enough to automatically pull a door open, though. [jurist, Jul 17 2005]
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Annotation:
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If we get started on spelling and
punctuation with this one, we'll be here
all night. At least this one has a few
capital letters, often in the right place. |
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It would be scarier to see magnetic objects flying from any peoples standing near the door, or indeed people with pacemakers apparently spontaneously collapsing. |
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This idea is knobtastic - |
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Mr. Google has just given me 312,000
hits for "automatic door opener" and
595,000 for "automatic door closer". So
I'm not sure that having a magnetic
knob is essential, interesting though it
would be. |
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Yeah yeah yeah. So what if I have trouble with spelling and punctuation. So maybe it's impractical, but you can put up a sign... |
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"GOOD CARDIAC ENTRANCE ONLY" |
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//So what if I have trouble with spelling
and punctuation.// You mean "So what
if I have trouble with spelling and
punctuation?", surely? |
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Magnetic fields do not operate over the distance you are implying here (2 feet minimum between closed door knob and wall) unless they are VERY strong. This error was also made in the Bond film "Live and Let Die" |
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I think the point that [po] was making was that, as you spelled it, it may mean something else entirely. |
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sorry, this wouldn't really work for 2 reasons #1- the magnets
would be too far away #2 every time you walked through this
door, if you had a cell phone or whatever all the phone book
contacts may be erased! (i doubt it would damage the
phone but that could cause problems-and then you may take
your frustration out on the door by kicking it really hard-and
then the door out of anger for unneccesary abuse, would fly
back at you quickly and strike you, repeating until you run
away screaming or are K-Od |
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Actually, it probably wouldn't erase anything. Phones store
data in memory or flash memory, not on disc, I think. And,
in any case, some of the most powerful magnets you're likely
to encounter in everyday use are already a part of your disc
drive. Still wouldn't work, though, for reasons that you and
Minimal pointed out. (Not such a bad idea, though, apart
from this.) |
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