h a l f b a k e r y"Look on my works, ye Mighty, and despair!"
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Lazarus was dead but rose again, and this is why his name has been appropriated to these new automated glasses.
When you take off a pair of Lazarus's Legs Glasses, the legs automatically fold over into the storage position. This process reverses itself when you pick them up again, with the legs fully
unfolding ready for wear.
This is possible because of the presence of a pair of micro electric motors at the two hinge points. These are activated due to a set of sensors by the action of taking the glasses away from the face.
When you set the glasses down, the legs slowly fold over into their inactive mode, and unfold again like Lazarus rising up when they detect the action of them being picked up by a finger and thumb grip at two specific points on the frame.
Small motor torque
https://www.robotpa...-Motor-20500-Rpm-3V
[bs0u0155, Jan 13 2023]
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[+] as royalty payment for flabby car skin I added multiple color waves to. |
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[+] but I think it could be done passively through springs and levers instead of electric motors. |
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//electric motors//
Batteries & all that guff? Nah.
I reckon you could do it with micro-fluidics; a couple of pressure points at the "normal hold" positions on the frame (or possibly even everywhere on the rims), some small "balloon" type actuators on the hinges. Squeeze -> open, squeeze again -> close. |
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My original idea from many years ago was to have 3 legs on either side that folded over in sequence like that of a dying bluebottle fly, a process that has always filled with me with great sadness to see. |
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Oh I LIKE this. It would definitely not be cheap, but neither were my prescription Ray-Bans! [+] |
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Might it be possible with memory metals, activated by the heat and/or conductivity of your skin? |
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Has to be motors, gears and levers to make it fully halfbaked. |
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The motors and gears etc would have to be quite hefty, it's a very small hinge and you're moving quite a large lever while actuating it from very close to the pivot. Presumably you want this to happen on a relatively quick time scale? It probably isn't possible, but lets run the numbers. |
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For a ball park, small motors turn at 20,000-50,000 rpm, you're looking for a 1/4 rotation in ~1second. So that's 15rpm. Call it a 20,000:1 gear reduction. The most space efficient way of getting big torque multiplication in one step is a worm gear. You can get ~300:1 out of a worm drive so two steps: 300x300 = 90,000 is in the right range. 150x150 gets us where we need to be. The smallest motor I can find a torque value for <link> (which is way too large) is 1.9g/cm. Now multiplying the tourque gets us 40kg/cm. We will have losses in the gearing however ~15%/step so we lose ~30% = 28kg/cm. That gives us 2.8kg at the end of a 10cm glasses arm. That's respectable, actually. Maybe a motor ~1/4 the size, say 12x5mm could work. I'm guessing efficiency trends downward with small sizes, but still I think it's workable if you're willing to put up with the weight. There's still somewhere to find for the battery of course. Something like a CR2032 coin cell should be OK. |
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The down side of work gears is they can't be back-driven. So if your battery dies, the glasses are staying open/folded until you replace it. Also, if you sit on them etc. they won't fold, they'll just bend/break. |
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I leave all of that malarkey to my technical assistants. If they build it, I will come. (and pay them) |
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