Automatic doors could been seen much easily nowadays in many different places, like hotels, airports, banks, hospitals, office buildings or even the transport stations where you can go through a door without pushing or pulling .

Automatic doors had already became a widely used products, and do you know when did they first come about and who invented the first automatic door? The answer is a mathematician.

Go back to the first century AD in Roma ,the mathematician Heron of Alexandria invented the first known automatic door. The writers of the day said that he used heat from fire to pump water from one receptacle to several containers using pressure, these containers were able to open the doors to a temple.Heron of Alexandria soon applied his door opening technique to other places, such as the entrances to the city.

Despite being well ahead of his time, Heron of Alexandria was unable to set up his system in many more places. His contemporaries and subsequent generations believed that it was easier and more effective to open a door using human strength or pack animals.

It was dozens of centuries later, in 1931, when engineers Roby and Raymond designed the first model of a device that automatically activated the opening of a door. The invention was patented and installed in a restaurant in Connecticut, in the United States. It was welcomed by the waiters of the restaurant, as they could move around with their hands full of dishes and glasses without having to use them to open the door.

Years later, the first automatic sliding door was launched onto the market....