Electromagnetic Sheath

This invention is a knife sheath that holds the knife inside the sheath with a permanent magnet. To temporarily deactivate the magnet, simply neutralize it with an electromagnet. All you have to do is press your index finger to a small heat sensor on the side of the sheath, which activates an electromagnet and neutralizes the permanent. The electromagnet is powered by several watch batteries. This arrangement makes removal an incredibly swift and ergonomic movement. Grip the hilt with your pinkie, ring, and middle fingers, and your thumb, touch your index finger to the heat sensor, and pull it out with no resistance. The heat sensor is my preferred off-switch because it prevents anything else bumping against it from dislodging the knife.

This invention is intended as an improvement over sheaths which use a button snap to hold the knife in place, because those damned buttons can be unsnapped by catching on your coat, or on part of a chair when you stand up after sitting. I also dislike friction sheaths because you have to pull against resistance, which I really dislike. Perhaps, instead of battery power, it would best be rechargeable. Or both. I'd probably sell a few different versions for more market vesatility.