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Here's a device I made a while back that works in a very similar way, has a strong spring to make sure the rod retracts as the ice melts, and contains the resulting water. It wasn't intended to be used directly with a restraint as you are showing, but rather as a very overbuilt key release. That sai...

I'm looking into what it would take to make a slightly simplified version without any corrosion-prone materials. Right now, the bolt, nut, and springs are all zinc-coated steel, which will eventually rust and/or corrode when exposed to moisture. Especially the ends of the bolt shaft, where I sawed i...

I really like Lifer's idea of being required to drink your own recently-produced urine through a straw to take weight off of something sensitive. I can imagine myself drinking a bunch of water and recirculating it a few times over the course of several hours before being freed. Mmmmm... Might have t...

I can't quite picture how one would be positioned in the frame. Are you kneeling with your legs extended back under the lower bar towards the ankle cuffs? And then how exactly do your arms get routed? It looks like fun!

I know this is an older topic, but in case anyone else could benefit from it, I have something to add. An outdoor equipment shop near where I live offers repair of fabric gear, and also sells materials for DIYers. They have Cordura, packcloth, and no-see-um netting by the yard for reasonable prices,...

Thanks! Here's a cross-sectional view showing the basic concept. The spring is not shown, but acts to ensure that the plunger always wants to move downwards instead of just trusting gravity. rel_diagram.png I have another creation (still a fairly crude prototype, but functional) that this works in c...

I forgot to mention... Sesamee (and some other good-looking) combo locks are available from McMaster-Carr industrial supply. (they also have damn near anything else you could need for any project!) http://www.mcmaster.com/ Search for part number 1160A1 for the lock you see in my photos. 1160A6 is th...

The original maker of the lock described above (four wheels on the bottom face; push the shackle down to release) is Sesamee. No amount of pushing or pulling on the shackle while turning the wheels will provide any feedback about the correct combination, requiring a systematic trial-and-error approa...

Hello all, Sorry to revive such a buried thread, but I recently finished the prototype described in my first post. Why it was abandoned on my workbench for so long, I'm not certain. Anyways... rel_1.jpg rel_2.jpg rel_3.jpg rel_4.jpg The release system consists of two main parts, the "plunger&qu...

I love the idea of an ice release as a quite foolproof release method, especially as a backup. What I'm not so thrilled about is the ice melting and dripping water in places I don't want it. The other day I stewed up an idea for a contained system made from a few PVC pipe fittings and some hardware ...

My apologies for resurrecting a buried thread. I was searching for something unrelated, and happened upon it. I figured I would toss in my contribution and you can flog me if you wish. :P I made two different butt plugs from wood years ago. I was still living with my parents, and shopping for "...