Patent search

When I came home today my wife had shown me a sketch of an invention she made today. I did a quick patent search, and found that the thing was already patented in US more than 20 years before we were born.

She does not like wearing high heels, but sometimes does, and she thought it would be handy if there was a way to adjust. Looks like the idea was not implemented, or just market did not react positively.