Paracord Easy-Release Extension Cord Lock




Introduction: Paracord Easy-Release Extension Cord Lock

About: I believe that the purpose of life is to learn how to do our best and not give in to the weaker way.

Make an extension cord lock that releases easily. This is handy when connecting hand held portable tools that require an extension cord. It will keep the tool plug and cord socket tightly connected as you drag the extension cord and tool around.

Intro pic shows the cord lock in locked position.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: How It Works

The Problem
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.

The Solution
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.

Paracord Contest

Participated in the
Paracord Contest

Be the First to Share


    • Trash to Treasure Contest

      Trash to Treasure Contest
    • Raspberry Pi Contest 2020

      Raspberry Pi Contest 2020
    • Wearables Contest

      Wearables Contest

    7 Discussions


    8 years ago on Step 3

    You are a GENIUS! Simple, easy, and effective! BRAVO! Thank you, thank you, thank you!

    Honda Enoch
    Honda Enoch

    8 years ago on Introduction

    Or you can just tie the cords together then plug them into each other.

    Sweet! That's an awesome idea, I'm so going to be doing that trick at work from now on. Thanks a bunch!!


    8 years ago on Introduction

    Pretty cool idea. Prusik knots are pretty awesome things to know about and are very versatile. (Just a heads up, in step 3 you say 'robe' instead of 'rope.')

    Cool instructable!


    8 years ago on Introduction

    Not to mention that when you coil the cord you can use this to tie up the coil. Great Idea.