I love safety pins. I find them incredibly practice on a variety of levels. You probably are grateful too for this little invention but did you know they were invented in 1849 by Walter Hunt. He patented it in 1849. It was one wire coiled at one end with a clasped at the other. Sounds very similar to what we use now. Walter Hunt also built the first sewing machine in 1832.
Here's a link to a page on Walter Hunt that also has an image of the first safety pin designed.
Walter Hunt The Forgotten Genius
Unfortunately as smart as Walter was with his ability to invent, he wasn't very prudent with his financial abilities and sold his patent for $400 to a man he owed the same sum for.