Hello there,

As the funny title suggests, this is about creating an Adult Cap from a Child Proof Cap.
Child proof caps typically require pushing down on the cap in order to open it, and often this is not needed because there are never any "childs" around.

Here is just one example of such a modification. The bolt is size 3mm and with a hex cap head. There is one hex nut on the underside of the cap, but it could also have a washer and maybe a lock washer, or some super glue to hold it fast.
The hole for the bolt is drilled off center so that the inner part of the cap can never rotate without the outer cap and thus it becomes mechanically just one cap instead of an inner and outer cap.

I also tried using super glue on the inside between the inner cap and outer cap, but because of the type of plastics used it does not hold for long. I decided one day that I was going to fix this problem once and for all. The bolt and nut are also high quality stainless steel. I suppose you could also just run a hot sewing pin through the top instead of the bolt and just bend the bottom part over so the pin cannot come out. It also has to be off center though.

I'd be very interested to hear other solutions also.

 

Many years ago my young niece was trying to open a medicine container (without success); I explained to her that it had a child-proof lid – she then studied the container for a short while and then asked ‘How does it know that I’m a child?’

 

Many years ago my young niece was trying to open a medicine container (without success); I explained to her that it had a child-proof lid – she then studied the container for a short while and then asked ‘How does it know that I’m a child?’

How does CAPTCHA prove that I am human?

 

With that type of lid (push down and turn) there's a much simpler solution. You can de-childproof it easily by prying the outer cap (the part that turns freely when not pressed) off the inner cap.

 

The child-proof caps we have, have a tab that you have to push-down before the cap will rotate, so I just cut off the tab with nippers.

 

The ones my pharmacy uses get can be inverted and are then not childproof. But I leave the original way because it is hard to line up the threads when inverted (it is treaded on the outside of the cap as opposed to the inside the original way.)

 

The child-proof caps we have, have a tab that you have to push-down before the cap will rotate, so I just cut off the tab with nippers.

I keep an old pair of cutoff pliers for this

 

With that type of lid (push down and turn) there's a much simpler solution. You can de-childproof it easily by prying the outer cap (the part that turns freely when not pressed) off the inner cap.

Yes I've done that, but it's kind of hard to do that and then it leaves a very unusual looking cap. Plus, I had a lot, a lot, a lot of 3mm stainless steel hex cap head bolts around and was not using all of them for anything useful

I've read now that some people use a thumb tack stuck into the top. That works sometimes. It might be hard to get it to stick into the harder plastic though. That too has to be off center.

 

My pharmacy was, for a while, using a very nice type of bottle that, in addition to being colored cobalt blue which is pretty, had a cap that could be set for either child proof or not by pulling up on the outer part. It took too much strength for a child to do, and because the problem for some people with the CP caps is hand strength, I am assuming it was intended to be set by the pharmacist before delivery.

It is one of the nicest bottles I‘ve seen.

 

Cobalt blue glass bottles (with vertically ridged glass so that blind people could identify them) were always used to indicate “poison” long before the days of the childproof cap.

 

My pharmacy was, for a while, using a very nice type of bottle that, in addition to being colored cobalt blue which is pretty, had a cap that could be set for either child proof or not by pulling up on the outer part. It took too much strength for a child to do, and because the problem for some people with the CP caps is hand strength, I am assuming it was intended to be set by the pharmacist before delivery.

It is one of the nicest bottles I‘ve seen.

That sounds pretty cool.
Our pharmacy uses the dual sided caps, child proof one way and screw on the other way (upside down).
It looks weird though when it is used with the screw on side because then the upper part of the cap looks like a little cup rather than a cap.
The other strange thing is this kind of cap has holes in the top and that seems like part of the simple construction not there on purpose. I would think they would make it "air proof" so nothing could drip into the bottle via the cap holes. It doesn't have to be air tight I don't think.