It is said that he designed an innovative vehicle for his frail wife and that it was the first one called in Japanese jinrikisha, meaning a vehicle pulled by human power.
Teatavasti meisterdas ta uudse veoki oma nõdra naise tarbeks ning see oli esimene kaarik, mida jaapani keeles hakati kutsuma sõnaga jinrikisha, mis tähendab inimjõul veetavat sõidukit.