Linkage structure of key switch

A linkage structure of a key switch, comprising a bottom shell, a surface shell clamped to the top of the bottom shell, five push rods successively inserted onto the surface shell and five keys clamped to the top of the push rods, respectively, wherein the linkage structure of the key switch further comprises:

• a self-locking assembly, capable of self-locking the second push rod and the third push rod;
• a linkage assembly, comprising a first connecting rod connected between the second push rod and the fourth push rod and a second connecting rod connected between the third push rod and the fifth push rod;
• an input assembly, comprising an input terminal, a common contact piece arranged opposite the input terminal and a fuse connected between the input terminal and the common contact piece;
• and
• an output assembly, comprising a first bridge metal dome arranged on one side of the first connecting rod, a second bridge metal dome arranged on one side of the second connecting rod, an output terminal fixed to the second bridge metal dome and a diode connected between the first bridge metal dome and the second bridge metal dome;
• and
• wherein the other ends of the input terminal and the output terminal both stretch out of the bottom shell, and the first bridge metal dome and the second bridge metal dome are oppositely arranged on one side of the common contact piece.