The hinges comprise of our daily life. It is impossible nowadays, to think about doors and windows without relating them to the common hinges. Nevertheless, almost we do not pause to think about them. Mainly in that they are not so common, but that there are been present from time immemorial, for example, in the history of music, like the hinge of piano. Without this, the history of music would have been very different.
This is only a small example of which so important they are these tiny objects (some times not as much), that often they are invisible for us. The principle of the hinge is very simple; to make possible the turn of doors, windows or panels without needing disassembling and mounting the pieces. This must to that a circular motion unites two pieces by means of a leaf allowing. The hinges are used in almost all the places where there is a ceiling and four walls of by means. There is home or no business that does not count on at least one. The materials for their manufacture consist, mainly of plastics and metals.
According to the weight and to the material of the two parts that it is wanted to rotate, will depend the material on the hinge to use. For example, of metal for the hinge of piano or plastic for the hinge of certain toys. Besides the materials used for their manufacture, the hinges also are different as far as their degree of opening, for example of 180, 90, among others, their visibility and its system of positioning. The piano hinge is more of the hinges used and than less we noticed. This must mainly to that it is done, indeed, so that it is not seen, she is one of the calls invisible hinges. Its aperture angle never exceeds 90 and it is always made in metal. At present there are many distributors of this type of hinge, mainly the companies that are dedicated to the musical article manufacture. Of this form, the sale of piano hinges is carried out through different channels. It is possible to emphasize, that there are differences between this type of hinges. It can have with or without perforation, of different lengths and weights. The difference between both it is in the type of finished piano and that is desired; this way, it will not be the same hinge for a tail piano that stops one short.