Today we perceive dorma door closer as something habitual, ordinary that has always existed. But, as is easy to guess, it was not always like that. The first mention of door closers has been found in ancient times. The ancient Greeks tried to close the door of a primitive arm – a rope tied to a rock. Loop In the nineteenth century, which was invented suddenly, is intended for swing doors, giving the opportunity to open the doors to both parties and its automatic closing in the spring.
Unfortunately, in a short time it became clear that those doors are highly specialized and dorma door closer gave no control. Taking into account all these drawbacks, the American inventor Blount developed for the first time a prototype known and spread today in all the closest to the door. This mounted narrower in its upper part and has acted with the piston and connecting rod mechanism.
The change in the speed of the dorma door closer regulates by means of oil. The principle is still used, even large and well-known manufacturers. Along with the development of scientific and technological progress in recent decades has been the discovery of new ideas allowed to carry out systems solutions in absolutely all areas, even now conventional can is a high-tech device.Tag : door closer, dorma door closer