Childproof Lever Doorknob

We have lever doorknobs throughout our house, partially for accessibility reasons. While they're easier for me to open, they're also easier for our clever toddler (and apparently [cats](https://www.youtube.com/watch?v=blSl487coFg)) to open. I looked around, and commercial systems try to prevent use of the doorknob completely and, if youtube videos are to be believed, they're ineffective at that. I didn't want something that could lock an occupant inside the room. This simple device blocks the lever from being pulled down, while still leaving it free to move up. Our short little toddler isn't big enough to push the lever up, so he's kept out, while us giants are free to pass.

This model is designed to fit a [Schlage Flair](http://consumer.schlage.com/products/pages/productdetails.aspx?ModelNumber=F10%20FLA%20619) with a round plate, but it'll likely fit many other models and brands. You may have to scale up a small percent if your doorknob backing plate is a different size.

Critic