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Two triangular flat magnets in opposing directions (the point
on
the first opposite the base of the other) pull each other, one
is
flat on the floor, the other the bottom of the door portruding
inward. When the door is left open it is slowly pulled back by
the
magnets. As the door closes
the strength of the pull grows
finally
closing the door.
On the doorpost and the door lip another magnet silently
pulls it
and keeps it shut. (That part is an old invention, not mine).
The shape of the thinning triangles may be spiralling and the
door
magnet may fold up onto the door as the door closes.
Designer N S arranged magnets
http://www.polymagnet.com/polymagnets/
Spring capability is a feature [wjt, Nov 14 2020]
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Annotation:
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Conventional door closers - the hydraulic damped sort used on fire doors - ate designed not to "slam". The last part of the travel is slow. |
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How does this magnetic system achieve that ? |
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(Not being snarky, genuine question - how about extra "buffer " magnets near the closure position ? ) |
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The inherent "slam" is to keep everyone awake thus assuring
mental alertness, shirley? |
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How do people wearing metallic items, like, say,
steel-toed boots, avoid stumbling as the magnet
attracts their footwear? |
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Look on the bright side, at least if you get a user equipped with Rosa Klebb-style weaponised footwear, it'll slow them up a bit ... of course, the innocent will suffer too, but you can write that down to the cost of "security" ... |
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Since when do people step on the 10 cm circle near the
hinges side of the door? |
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ohh polymagnets! Thanks wjt! looking for an idea of yours so
I can [+] |
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// Since when do people step on the 10 cm circle near the hinges side of the door? // |
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Whenever they suspect that said door might be booby-trapped, and wish to inspect it closely from numerous angles before risking opening it ? |
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