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I am really taken by the "Safe-T" design embellished fire extinguishers, but not the price. There are no reviews online that I can find to give me insight into what the product is like, not that I'd be in a position to buy one anyway.. so I would like to make one. ref: https://safe-t.us Now, I...

LionelHutz : Hi Lionel, and thank you for contributing to keeping this topic alive. My primary concern was with the technical feasibility of the concept design, rather than mass market potential. After reading that the concept was technically flawed I was intrigued to better understand why as I...

I can't say that anything these days is taken seriously if it's considered "green" any more, that fad has been and gone. However, money is and will always be king, so people interested in this are looking at the potential of the product, not the cost, and so long as it doesn't cost too much...

VE1BLL : "Using AC magnet (with an iron 'target') would be noisy, buzzing away with 50 or 60 Hz. Nobody would want that." - I recall when magnetic doors are secure that they don't make any noise, possibly only when used to open them, so the plug could be attached all of the time without audible...

Recent concept art for induction powered plugs to replace fixed plugs like the BS1363 proposed a feature which would lock the plug in place by passing a current through the socket area to create a magnetic field to keep it in place (much like a door lock) - I would like to know how feasible this...

IRstuff: I was looking for a system with no moving parts. I just want to know if polarities can be switched with a currents passed through a magnet. The idea being that the opposing poles repeal the two materials and then when the electricity switched off then once again naturally attract, But...

handleman: yes, it seems so, but I'm trying to find out if it's possible in the first place? Issues like proximity of the magnets need to be addressed, as they will be touching and I only need one set to flip their polarity, but in essence they should repeal, then on a rail like system the top...

IRstuff: Only having just looked into electromagnetic locks I didn't realise that there were fail-safe and fail-secure types, I see now how both exist. However, it seems that the constant electrical field option with the fail-safe system will give added ability to the magnets so that they have...

I see what you mean about magnetic door locks. But that would require constant power, and if interrupted then the two surfaces would float freely, which is the opposite of what I need. I would like to disengage the two (reverse the polarity of one set so that both push away from each other)...

If two touching planks of wood are kept in place with opposing magnets in each plank, can one set have their polarity changed by passing an electrical current through them, allowing the other plank to move easily, and when the electricity switched off the plank now remain firmly in a new...