3 Simple Ways to
Share What You Make

With Instructables you can share what you make with the world — and tap into an ever-growing community of creative experts.

PhotosPhotos

Share one or more photos of a project, recipe, or whatever you've made, quickly and easily.

Step by StepStep-By-Step

Share your step-by-step photos with text instructions of what you made so others can do it too!

VideoVideo

Share your how-to video. You'll need your embed code from a video site such as YouTube.

Home Made U-Lock Bicycle Lock

Step 2Boston Massachusetts, 1974

Boston Massachusetts, 1974
Many patents for bike locks come from the Boston area.

That's because North Korean submarines loaded with ninja spies go there to steal bicycles.
There are about fifty colleges within ten miles of each other. All those students are
1) Easy to steal bikes from, and
2) Easy to sell stolen bikes to.

When I lived in Boston I had the lock made from these patent drawings. It was great. It was a bit unusual, so the North Korean training camps didn't bother teaching people how to break them open.

This excellent but simple lock is the inspiration for this whole project. The drawings shown here explain all you need to know about how it works. To keep boltcutters from reaching the hasp of the padlock, there is a sort of box around the padlock. The crossbar has lumps to keep it from pulling through the U.

« Previous StepDownload PDFView All StepsNext Step »

Pro

Get More Out of Instructables

Already have an Account?

close

All Steps Viewing
View all steps of an Instructable on the same page when you're a Pro Member.

Upgrade to Pro today!
1250
Followers
223
Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
more »