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Historically, the first caps were made with a friction closure (those that are generically defined ''[[slip cap]]s''), with the cap that fits on the body. There are different variants of this type of choice, depending on the way in which the joint is made; the two main classes are the so-called ''[[cone cap]]'' (conical section cap) in which the interlocking surface is a truncated cone, and the so-called ''[[straight cap]]'' (cylindrical section cap) in which the interlocking surface is cylindrical, among the latter there are then the so-called ''[[tapered cap]]'' (conical or tapered cap) in vogue at the end of the 19th century.  

Historically, the first caps were made with a friction closure (those that are generically defined ''[[slip cap]]s''), with the cap that fits on the body. There are different variants of this type of choice, depending on the way in which the joint is made; the two main classes are the so-called ''[[cone cap]]'' (conical section cap) in which the interlocking surface is a truncated cone, and the so-called ''[[straight cap]]'' (cylindrical section cap) in which the interlocking surface is cylindrical, among the latter there are then the so-called ''[[tapered cap]]'' (conical or tapered cap) in vogue at the end of the 19th century.  

Ai cappucci ad incastro, che soffrono, specie nella versione ''conica'', di problemi di usura delle superfici con perdita di tenuta, sono seguiti, con una tendenza affermatasi a partire dagli inizi del '900, i cappucci con chiusura a vite (''threaded cap'') che ancora oggi sono fra i più diffusi. Un ritorno dei cappucci ad incastro si è avuto negli anni '40 con l'introduzione dei cappucci in metallo chiusi a frizione su appositi anellini (tendenza introdotta dalla [[Parker 51]]).  

The interlocking caps which suffer, especially in the ''conical'' version, from problems of wear on the surfaces with loss of tightness, have been followed, with a trend established since the beginning of the '900, by the caps with screw closure (''threaded cap''), which are still among the most common today. A return of the interlocking caps took place in the '40s with the introduction of metal caps closed with friction on special rings (trend introduced by the [[Parker 51]]).  

Verso la fine degli anni '40 è infine iniziata la diffusione dei primi cappucci con chiusura a scatto (una delle prime aziende ad averli utilizzati è stata la [[Matador]] con il modello [[Matador-Click]] del 1949) divenuti in seguito molto comuni e tutt'ora in ampia diffusione. In questo caso la qualità del meccanismo è essenziale per garantire nel lungo termine il mantenimento della chiusura del cappuccio.

Towards the end of the 1940s, the first snap-action caps began to spread (one of the first companies to use them was the [[Matador]] with the [[Matador-Click]] model of 1949), which later became very common and still widely used. In this case, the quality of the mechanism is essential to ensure the long-term maintenance of the cap closure.

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==Brevetti correlati==

==Related Patents===

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