Patent ID: 8585407

Claim:
A backlash vibration mechanism used in a toy gun having a forwardly returnable piston-cylinder mechanism and a disarm mechanism and arranged above said piston-cylinder mechanism, wherein said backlash vibration mechanism comprises: a weight inserted through said disarm mechanism, wherein said weight comprises a retaining portion; a reaction spring connected between a rear side of said weight and a part of said toy gun and adapted for returning said weight after said weight having been moved backwards; and a brake unit arranged at a front side relative to said disarm mechanism, wherein said brake unit comprises a retaining member and a braking block, wherein said retaining member is adapted for retaining said retaining portion of said weight for synchronously movement with said weight when said weight is moved forwards by said reaction spring upon each operation of said toy gun, wherein said braking block is moved backwards to push said disarm mechanism backwards to simulate a disarm operation of a real gun when said retaining member is moved forwards, wherein said toy gun comprises a front shell located on a front side thereof adjacent to said weight and said retaining member, wherein said front shell comprises a protruding portion, wherein when said weight and said retaining member are moved to a front limit position, said retaining member is forced downwardly away from said retaining portion of said weight by said protruding portion, and said weight is released from the constrain of said retaining member and forced back by said reaction spring, and said braking block is moved forwards and said disarm mechanism is forced back to finish one operation cycle.