Mr. Scoops is a toy project that I've worked on for a "Production Materials and Techniques" design class.  The basis of the project was to design and build a working prototype of a mechanical toy along with the expectation of craftsmanship and functionality.

The ideation of the toy spurs originally from the Fisher Price Corn Popper toy, which uses a pushing technique that causes a popping motion of the plastic balls inside the clear dome.  I took the working mechanism from the original toy and switched up the dome shape design of the Corn Popper by adding a more personable and kid-friendly 'ice cream truck man' character to it. 

Step 1: Popping Mechanism

1. Linkage
2. Spring
3. Platform
4. Plastic Shaft
5. Axle
6. Wheel

The corn popper toy has a very basic “popping mechanism”. It consists of a linkage, spring, platform, plastic shaft, an axle which is attached to the wheel. The spring and linkage would be placed inside the indented housing on the platform then enclosed in place with the plastic shaft (through the key-hole shape on the linkage). 

The wheel axle has a slight indentation in the center that when turned, would catch a small, spring loaded linkage at the center of the body. Therefore, when the toy is activated, or pushed on ground, it would cause the indentation of the axle to rotate and catch onto the hook of the linkage as shown in the image. Once the axle makes its way around 180 degrees opposite, the linkage would release from the indentation of the axle, causing it in reaction to make the popping motion.
<p>Does the shaft have to be plastic, i think i only have metal</p>
Why didn't you 3D print the form for the vacuum forming as well? Would have saved a lot of time and effort shaping foam, and since it already exists in the CAD world it should have been easy to do. You can always shrink the dimensions a few mm and coat it if you're worried about the form overheating, or make the final form by casting a resin one from the 3D print.
I would've loved to! You're right it would've saved me a lot of time and effort but printing out the main housing along with the other parts alone cost me around $300 already and I wasn't able to afford to pay anymore than that. If I had more time and money I definitely would've explored and tested out the vacuum forming process a bit more but I was on a time constraint and a budget. And surprisingly the foam wasn't all that hard to work with or take as much time to build as I expected!
This looks commercially made, that is amazing. Well done
Haha awesome that was my initial intention, thank you! :)

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