The etymological root of the term key It is found in the Italian word chiavetta. The concept has different uses according to the context.

The notion of key can be used in the colloquial language to allude to whom has gone mad. Who is key, therefore, lost his mind.

Fury

It can be said that someone who gets angry loses the key.

Chaveta, synonym of crazy and head

When it is claimed that someone turned a key, it is referring to having irrational thoughts. Therefore the key manifests a erratic or crazy behavior, or at least not in accordance with the social mandates and the conventions of a community.

Also called key to head of a person. In this way, linking this meaning with the previously mentioned meaning, it is usually indicated that an individual lose the key (that is, the head) when it goes crazy.

In a similar way it can be alluded to being bad key. Anyone who is wrong with the key has a mental disorder or imbalance, either diagnosed by a professional or noticed by those around him from his behaviour.

Suppose a young man is walking down the street when he suddenly begins to insult others persons for no reason. Against this background, it can be pointed out that the boy is in a bad way.

Gear

A key is a mechanical part.

The concept in mechanics

A key is called a mechanical part that allows joining two elements in a specific way. The key is inserted between the parts to be linked, generally to allow a transfer of power.

It is important that the key fits well, without slippage. Otherwise, it may be broken or a wear premature.

Typically, the key has a semi-cylindrical or prismatic design. Its most frequent use consists of the union of a axis with another item.

Its installation is carried out in a slot known as keyway, which works together with the mated parts. These pieces have to be in solidarity with each other, which allows the transmission of power.

Key types

According to their shape, the keys can be tabs or longitudinal. A tongue key has parallelism between its lower face and its upper face. A longitudinal key, on the other hand, exhibits a inclination on one of their faces.

Another classification of the keys is given by their way of working. There are keys that work for cut and others, for friction.

Different uses

Keys are used in various contexts. In the pulleys and in the axles Of electric motors, for example, keys can be installed.

In the case of automobiles, a key connects the flywheel to the transmission shaft. This prevents the relative rotation of the gears or pulleys around the shaft.

Key as a nickname

It should be noted that key is also used as Nickname, resuming the sense linked to madness that we mentioned above. In this framework we can name the Mexican soccer player Jesus Chavez Guzman.

“The key” Chávez Guzmán played in almost a dozen clubs in his country, both of First like Second division. The teams where the most matches played are Puebla FC (today Club Puebla), Chiapas Jaguars and Dorados of Sinaloa.