Knex Automated Door Closing Device


Introduction: Knex Automated Door Closing Device

About: I have moved on to better things...aka YouTube. So I will most likely not reply to any comments, sorry for any inconvienience. If you have important questions, you can go to my youtube channel (MagmaRhino) a...

This is the one and only Knex door closer. I admit it is not the best but it works fine. You can even close the door from far away by adding a string to the pin.

Step 1: The Body

This is the main part. It holds the counterweight. It is possible to make the tower 1 gray rod higher to shut the door even farther.
I Know a lot of the pictures are out of order but please try your best. If you have questions feel free to ask.

Step 2: The Counterweight

You need 2 D batteries for this. Duracell are the heaviest.

Step 3: That Other Part

It is the pulley that closes the door. To see how to set it up watch the video or look at the next step.

Step 4: Setup

It is hard to explain and I have no pictures, but I'll try my best. Place the door closer on the back side of the door near the hinges. the open part on the frame should be facing the door. the other part goes on the opposite side with a weight on it. Please watch the video and refrain from asking too many confusing questions. Mods:place this wheel to make the door close faster.

Step 5: More Pics and Vidoes

Wow. even more marvelous things to look at. Sorry I don't have anything yet.



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    We have a be nice policy.
    Please be positive and constructive.




    you could add a trip wire and make your room pitch black so when someone walks in the door closes on them!!!

    As soon as I finish building it, the door slams open and it goes SMASH!!

    1 reply

    Please take more picture

    Hmm. "Why would you want a door closer?" PROBABLY TO CLOSE THE DOOR! Not meaning to be rude, just pointing out a "duh" answer to your question.

    he meant to say 'why would you need a door closer when you could do it yourself' your so dumb,you think you know your so immature...

    Dude, does be nice policy mean nothing to you. Plus, I said it was a "duh answer".

    Oops, I meant "Dude, does BE NICE POLICY mean nothing to you?".

    A: Why do you have to be so critical. I was bored so I built it.

    I was sorta kidding, I kind of thought it was pointless.

    Well, it closes doors, and doors are there for opening and closing, so no. No it is not pointless. Not in the least. I think what you mean, is its only value is hack value. I'd agree with that.

    well mybe everyone who is saying that it has a purpose r jst fat lards who sit around n play xbox all day n cantt get up n close a friken door.

    Way to generalise there. Millionaires who have their own gyms, and are in the peak of physical fitness have automatically closing doors. Gonna call them fat? If you don't like the model, don't build it, and don't judge others. You don't have the right.

    They hav money n work out. Oh ya i didnt mean to offend u when i said FAT!

    A: I think it is for people that are too lazy to get out of their chairs and close the door.