Blueprints for free?

Is there an online site for blueprints like Wikipedia except donated blueprints/drafts? Maybe with a load of expired patents and such. It might be helpful for developing nations to be able to download a draft of the Wheel instead of reinvent it.
I don't real care much, I was just wondering around the internet thinking about Air cooled single cylinder motorcycle engines and stuff.

 

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IIRC, you can get any expired us patent directly from the us patent office, usually online. That was the original intent, to make inventions widely available to the general public to use for free after the patents expire.

 

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Yes, you must see US patent # 6,293,874 :
User-Operated Amusement Apparatus for Kicking the User's Buttocks.

 

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Thanks Kevinalm I'll give that a look.
Spidergoat according to a friend of mine there's some early female masterbation devices on www.vintage-reprints.com if you want a good laugh or an insane hobby. They *should* leave leave less bruises than buttocks kickers.

 

For patent illustrations you can always try www.patentroom.com - a site devoted to 1920s to 1960s patent art, including some rather amusing architectural designs including the "portable gasoline filling station booth".
http://www.patentroom.com/architecture/patents/airplane-gas-station.html