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bslayton

Ninja Lock - Indoor Child Door Lock

by bslayton Sep 24, 2015
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What a great design built from a necessity to address a very real issue.

Excellent idea & design.
To late for my not so little ones, but if I were insane enough to have more, these would be everywhere.
As for the damage they may do to the paintwork.. compared with the damage a child can do (fingers intact) to an entire house/garden/car/pet/sibling is minimal.
One of ours felt tipped an entire room, a couple of scuff marks would have been far more preferable. LOL

Nice work! One idea for making it more durable might be to print it in PETG. It's more flexible than ABS and will bend more before it breaks.

I just made one of these today, because we have a new baby. We didn't want to shut the door, so we could hear him crying, but the cats kept trying to get into the room. This worked excellently for holding the door open just a crack, without letting the cats in!

Printed one a few days ago and I love it! Works perfectly for my 2 and 3 year olds but makes the room immediately available for the wife and I.

The scratching on the soft pine and latex paint on the frame is a small issue but as long as you use it correctly, it shouldn't be an issue.

Only thing I noticed is that when it is mounted on a slab (door) and you put on the ring, the leg that attaches to the door on the opposite side of the ring comes out a little. I worry about that loosening up over time but other than that, this is an awesome design! I seriously don't know why you don't sell these.

Printed one a few days ago and I love it! Works perfectly for my 2 and 3 year olds but makes the room immediately available for the wife and I.

The scratching on the soft pine and latex paint on the frame is a small issue but as long as you use it correctly, it shouldn't be an issue.

Only thing I noticed is that when it is mounted on a slab (door) and you put on the ring, the leg that attaches to the door on the opposite side of the ring comes out a little. I worry about that loosening up over time but other than that, this is an awesome design! I seriously don't know why you don't sell these.

Coincidentally, I did something very similar, but to control my dogs! I needed to keep them out of some rooms but keep the doors open enough for ventilation.

The second version I made kept the door open wide enough for them to have access without having the doors accidentally closed, or to keep noise down [like a washing machine]. I will post pics of mine in the "I made one" section.

I like your design better with the loop for pulling it off the door frame.

Thinking the addition of some thin foam tape on the contact edges could prevent scratching or the plastics colour rubbing off on the white paint on door/jamb.

Hoping the device will be strong enough to keep the gf's cats from a room (with guitars/music equipment), but also leave enough of a gap for some cross flow through the house in summer.

This thing works surprisingly well, though the boys (6yo) at our birthday party were too rough and were able to shove the door open. Thing didn't even break.

Great for stopping pets entering your bedroom when they've figured out they can force the dodgy door handle door!

I printed one of these out of ABS, and I"m already loving it!

This only works if you have a beam that far from your door.

a door frame is a door frame, pretty much a standard thing in the construction industry. Of course there are custom frames and metal frames, but for 90% of home owners I'm certain this will work just fine.

(source) 8 years of building houses, then on to designing them ;)

That's the door frame...

Printed this with PLA, at 40% infill. The PLA was a little too brittle for this build. Either that, or my kids were way too rough on it... Anyway, great build and a lot of fun. Made things comfortable for a few nights.

My print was ok with PLA. 20% fill.

I like the idea, but isn't that triangle part just going to snap off when somebody forgets its there and yanks on the door? Not trying to be a naysayer - honest question.

The triangle pet actually works great this far. Haven't had any issue out of it other than the tip scratches the door frame.

Interesting. I'll have to give it a try. ;)

This reminds me of the Wedge-IT

http://smile.amazon.com/Wedge--WEDGE--Ultimate-Door-Green/dp/B00N4M2UCM/ref=sr_1_6?ie=UTF8&qid=1445476979&sr=8-6&keywords=door+wedge

which I own (and is awesome) and now I'm realizing... I could just print more of

Very nice design. It looks like a lot of thought went into it.

My only concern in using it would be the inevitable tracks that will be gouged into the wood - especially when the door is closed and the latch rides up the wood door stop and snaps into place. Have you considered a two-piece design? Perhaps a plastic-on-plastic ratcheting mechanism...

Robert

Thanks! Scratching the door frame is definitely an issue and one that I'm working on.

I have considered a 2 part design but this is my first model ever. I'm new to modeling and wanted to make something useful but simple in design. I would totally like to expand on my skills in that area.

i have an dea.. what if you printed a cover for the door fram which can be taped into place with sided tape? then the friction is only on the 2 3d printed parts.. this could also give opporutnity to provide more of a hooking connection on the door fram?

My door opens inwards. thus not so easy to release it.

Great idea, my only concern would be in the case of an emergency, how much could this hinder trying to get to the child, or, and I hope it never happens, but if a fire starts in the children's room and they're stuck in there.

The part is strong enough to keep small children contained but not so strong that it won't break in case of emergency. It doesn't take much force at all to get it to come off but definitely more force than what my kids exert on it, at least.

I don't think it's strong enough to hinder anybody opening that door in an emergency

Given my experience with ABS's strength:

A slightly thicker clip can almost hold 100 lbs (tested as a hammock clip--my dad broke them). For everyday use, kids are unlikely to break these. In an emergency, though, it should be fairly easy to break the clip in the case you can't get it off. A kid ramming the door will likely break the clip.

They will burn and die. But if you get them out because they are crying and screaming they will be safe.

Comments deleted.

Really Cool hold open also the door for cats or dogs!
Some Little changes!

---- 3ddruckmag.ch
Martin

This was exactly my thought!

Cool design! I like this concept a lot. Have you had a chance to see whether the ABS/PLA material that you may be using is making marks on the paint after more than just a handful of uses?

Thanks!

With the black ABS filament, i've noticed the black does, indeed rub off a little bit onto the door frame (You can see this in the picture where I did have the lock ~2 inches lower previously. I printed some locks out using clear ABS filament and that works a lot better in regards to the color rubbing off as there is no color to rub off. Depending on the exact dimensions of the door, it can dig into the wood and leave more of a scuff mark on the door frame. I've noticed some of the door frames in my house end up being a tighter fit for the Ninja Lock that others. I'm trying to think of a way to remedy this so the door frame is protected. One thing that might help is if I round off the pointy tip a bit where the lock latches onto the door frame, however, I've yet to try this.

As far as PLA goes, I haven't printed much with it as it gets stuck in my Da Vinci printer. I need to make some printer mods before I print in PLA. I would assume similar results with PLA that I got with ABS.

Would applying felt to the part that scuffs the frame help?
I have had good luck with that approach on some things I have made that come in contact with my hardwood floors.
You can buy blocks of felt that is sticky on one side from most hardware stores.

i suggested printing an l shaped piece to cover point of friction and using double sided taped to adher to door frame.

Looks great! We are going to need a couple of these. On one room we have, there is a kitty litter box. A modified version that provides enough room for a cat to transgress, but keep the Ninja's out, might be a useful extension to the design. I love the design though. Thanks for contributing it!

Thanks! I appreciate that. This is my first design. Good idea about allowing enough room for small animals! I wouldn't have thought of that as I don't have animals. Let me see if I can whip up something that will allow for pets to get through.

Thanks again!