Lock mechanism

A lock mechanism, comprising:

• a first mounting plate;
• a second mounting plate;
• a restricting plate coupled to the first mounting plate and located between the first and second mounting plates;
• a fixing base disposed on the second mounting plate;
• at least one first fixing element having a first end and a second end, the at least one first fixing element is penetrated through the restricting plate in a direction from the restricting plate toward the second mounting plate, wherein the first end is restricted on the restricting plate and the second end is coupled to the second mounting plate such that a clamping space is formed between the restricting plate and the second mounting plate;
• and
• at least one second fixing element having a third end and a fourth end, the at least one second fixing element is penetrated through the fixing base in a direction from the fixing base toward the first mounting plate, wherein the third end is restricted on the fixing base and the fourth end is coupled to the first mounting plate.