HOW IT WORKS?

This object is as simple as effective and maybe that's why earlier in 1300 or 1250 b.C. in ancient Greece and Rome, were used very similar objects called "Fibula" for various utility functions.

Is normally one piece of metal with two parts very fine and long that in one of the extremities is folded with two turns, causing a spring effect and at the other end has a slot in which a pointed part fits.  This slot serves two purposes: to form a closed loop thereby properly fastening the pin to whatever it is applied to, and to cover the end of the pin to protect the user from the sharp point.                 

 

The safety pin runs through the elastic capacity of the material it is made​​, typically metal, utilizing a spring effect that allows one end peaked has space to engage and disengage so that when closed it remains so without the loose risk.

With a material that does not have enough elasticity is not possible that this object works, it is indispensable that there is a movement of the pointed end so as to open and close.