Introduction and Plan
Child-proof maybe a bit too strong of a term to use for this gate as there will always be some kid who will figure out how to scarper over the top of it, so maybe child-resistant might be a more accurate description.
Anyway, the purpose of this project is to make a standard 900mm (36′) high picket gate a little bit harder for small kids to open and let themselves (as well as their dogs) into any area they may not be allowed into unsupervised.
The project basically involves incorporating an extended A vertical side member of a sash. (upright Piece of lumber that is part of a frame or structure.) into the gate frame, high enough to attach a gate The locking device on a door or window. which is out of reach of the kids.
Below is a plan drawing with instructions on the next page.