The pinyin of thumbtack: tú, dīng.
The American push pin was first invented by Edwin Moore (also the founder of the Moore Push-Pin Company) around 1900.
The pushpin, as it is still widely known today, was invented in 1903 by a German watchmaker, Johann Kirsten. On January 8, 1904, John sold the patent rights of the thumbtack to businessman Otto Lindstedt; it is worth mentioning that later, while the inventor John Kirsten was still poor, Otto Lindstedt De Stette became a rich man. Other sources indicate that the thumbtack may have been invented by Austrian factory owner Heinrich Sykes in 1888.
Physical principle:
Most people can nail push pins to specific locations with bare hands, which is related to the larger round cover and tip on the upper part. When the hand exerts small pressure on the round cover of the upper part of the thumbtack, the tip of the thumbtack gets greater pressure due to its extremely small area, so that it can be easily nailed into a specific position. The smaller pressure of the hand means that the upper part of the thumbtack is not Can prick your fingers.
Products used for fixing drawings, calligraphy and paintings, generally for temporary fixation, easy to use, and labor-saving installation and disassembly. It is a daily necessities for nailing paper or cloth to a wooden board or wall.