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犬の貯金箱("doggy" piggy bank)


AkubiCot

小学校中学年の自由研究でつくった犬の貯金箱が、初めての設計プロジェクトでした(設計プロジェクトと言えるほどのものではないかもしれませんが(笑))。犬の舌に硬貨をのせると、硬貨の重みでスイッチが入り、喜んでお金を食べてくれる、といったものです。仕組みは単純で、尻尾に見立てた消しゴムをDCモータにとりつけ、それを回転させることで、本体が震え、だんだんと硬貨が飲み込まれていくようなものでした。目には豆電球をつけ、モータとあえて直列に接続することで、豆電球の明暗を常に変化させ、ご飯をもらえて喜んでいるワンちゃんのように見える工夫なんかもしていましたね。

 

My first design project was a "doggy" piggy bank that I made as a summer science project(summer homework at Japanese elementary school) in the middle grades of elementary school (although it may not have been much of a design project). When you put a coin on the dog's tongue, the weight of the coin triggers a switch and the dog happily eats the money. The mechanism is very simple: a rubber eraser which look like a tail is attached to a DC motor and when the motor is rotated, the dog's body tremble and the coin is gradually swallowed. The bank also have two light bulbs as dog's eyes. By connecting the light bulbs in series with the motor, the light and darkness of the light bulbs would constantly change so it looks like a dog that was happy to receive food.

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