Three position lock mechanism for a vending machine

A key operated lock having at least three locked positions, comprising:

• a barrel having a bore therethrough, said barrel including an inner wall defining said bore, said inner wall having at least three elongated slots formed longitudinally therein, said elongated slots being in parallel relationship with and spaced circumferentially from each other about said inner wall, said slots corresponding to said locked positions, said barrel having an arcuate channel formed in one end of said barrel and first and second stop means defining the ends of said channel, said first and second stop means being formed next to non-adjacent elongated slots;
• a cylinder mounted for rotation in the bore of said barrel, said cylinder being formed to receive a key and comprising a stop lug adjacent one end of said cylinder for travel within said channel between said first and second stop means when said cylinder is rotated in said barrel, said stop lug being positioned on said cylinder at an angle from said retractable means corresponding to the angle between the elongated slots;
• key-responsive retractable means associated with said cylinder and formed to engage with each one of said elongated slots when said cylinder is rotated to said locked position corresponding thereto and said key is removed therefrom.