Creepy Dragon Wind-up Toy Dissection

Made by Ruben Markowitz, Joseph Paetz and Christine Amin

Explore the inner workings of a creepy dragon.

Created: January 14th, 2016



We figured that attached to the main drive shaft was a spring that wound up. After that was a gear turned a gear behind that. The second gear was then attached to an axle. At either end were two disks with off-center pegs that, as they went around, shook the dragon's booty, thus providing a forward vector. The head, we figured, was attached to a vertical axle, which  had a flat disk with a universal joint off to one side. This U-joint had a rod, connecting to the drive gear with another off-center U-joint.

The Real Mechanism

The real mechanism for the legs was exactly how we had guessed. The head was close; there was a plastic piece with a peg pointing up that connected to the flat wheel, off-center. The man gear drove a small gear on an axle containing a little wheel with an off-center peg. That peg slid in a little slot in the plastic piece, pushing it back and forth, and then turning the head.
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39-245 Rapid Design through Virtual and Physical Prototyping

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Introduction to rapid design through virtual and physical prototyping. The class will cover the design process, problem solving methods, interdisciplinary team work, current industrial practice, an...more


Explore the inner workings of a creepy dragon.