Four-button principle

Using the characteristics of button beads, there are big and small. The traditional snap button realizes the locking function through the cooperation between the ball head and the slingshot cup. Its principle is that the button ball is buckled between the springs of the slingshot cup, and a large part of the button ball passes through the deformation of the springs. After the button ball is buckled into the slingshot cup, the spring recovers its deformation and gets stuck in a smaller position on the button ball, thus realizing the locking of the buckle.