Industrial hinges
Introduction
A door (from the Latin porta), sometimes also called a portal when it is a main door in some sense (for example, a door that connects a building with the outside),[1] is a complementary element in construction with very diverse applications, uses and locations, which is industrially manufactured in basic materials (wood, aluminum, glass, plastic). In the architectural space it serves to separate rooms, facilitating both their isolation and access between them. It has several types of metal fittings of the hinge or "bibel" type, and can have locks, padlocks, bolts and complementary latches, to close or open them more easily.[2].
The door can move in various ways (at angles away from the door/portal, sliding in a plane parallel to the frame, folding at angles in a parallel plane, or rotating along an axis in the center of the frame) to allow or prevent entry or exit. In most cases, the interior of a door matches its exterior side. But in other cases (for example, a vehicle door) the two sides are radically different.
Many doors incorporate locking or lock mechanisms to ensure that only certain people can open them (such as with a key). Doors may have devices such as knockers or bells by which people outside announce their presence. (In some countries, such as Brazil, it is customary to clap from the sidewalk to announce someone's presence.) In addition to providing access into and out of a space, doors can have the secondary functions of ensuring privacy by preventing unwanted attention from strangers. of separating areas with different functions, of allowing light to enter and exit a space, of controlling ventilation "Ventilation (architecture)") or air flow so that interiors can be more effectively heated or cooled, deadening noise and blocking the spread of fire.
Doors can have aesthetic, symbolic or ritual purposes. Receiving the key in a door can signify a change of status from outsider to insider.[3] Doors and portals frequently appear in literature and the arts with metaphorical or allegory significance as a harbinger of change.
Word origin
In times of the Roman Empire, when an old city was founded, its perimeter was laid out using a furrow made with a plow according to an old Etruscan rite.
The marked furrow should not be crossed given its sacred nature. In Spain, King Alfonso VIII decided that in order to protect a house there must be doors. The sacrilege of the founding furrow of Rome was the cause of the life that Romulus gave to his brother Remus.