Intro pic shows the cord lock in locked position.
Step 1: How It Works
Small power tools like drills and saws often need an extension cord which tends to unplug when dragging it around. You could just tie the connected cords in a knot, but that tends to catch on things and it also fatigues the wire in the cords which leads to early failure of extension cord sockets and tool plugs. I have replaced countless sockets and plugs because the wire in the foot next to the connection has gone bad from too much bending.
24 to 28 inches of Paracord are all you need to solidly connect any tool with an AC plug to an extension cord. Once set up, it can be easily connected or disconnected. The lock is streamlined, so it allows you to move the tool around without catching on things and accidentally disconnecting the extension cord.
Step 1 pic shows the way the cord lock is released.
Step 2: Make a Simple Loop
Take 28 inches of paracord or braided cord and slightly melt the ends with a lighter to prevent unraveling. This will be a little long, but it can be shortened later to accommodate the size of your extension cord and tool plugs.
Use a fisherman's knot to make a continuous loop-step 2 pic.
The thumbnail pics show the knot tightened and the finished loop.
Step 3: Make a Prusik Knot
Pass the loop around the socket of the extension cord and then through itself. Go through again and you will end up with a Prusik knot.
The Prusik knot has the unique ability to slide up a rope or cord easily but when it is weighted it tightens and stays in place. It is sometimes used in rock climbing to ascend a rope or for rescue work.
The Prusik knot stays permanently attached to the socket of the cord and can be slid up or down to tighten the cord lock.
Lock The Lock
Make a double loop on the end opposite the Prusik. Slide this over the tool plug and tighten. Plug the cords together. Then slide the Prusik until the extension cord has a slight bend and your cord is locked. To unlock, loosen the middle of the Prusik by pushing where the loop comes out and then slide it towards the socket. This will give you enough slack to unplug the tool plug and remove the loop around it.