Tumbler plate cylinder lock

A tumbler plate clylinder lock comprising:

• a housing having a first center b ore and being provided with a plurality of longitudinal slots around the inner peripheral wall thereof;
• a cylinder rotatably mounted into said first center bore and being provided with a second center bore;
• a plurality of locking members snugly mounted within said second center bore, each of said locking members having a center opening and two extensions extending longitudinally and outwardly from said center opening, one side wall of each of said center openings being provided with a projection extending along the longitudinal axis thereof and having a length corresponding to the depth of a depression formed on the outer periphery surface of a shank of a key adapted to lock and open said cylinder lock;
• guide means for spacing and guiding said locking members;
• and
• a plurality of arciform shaped spring members, each spring member being interconnected between each two of said locking members to urge said pair of locking members in opposite directions to move along said guide means and cause one extension of a corresponding locking member to engage with a respective one of said longitudinal slots to prevent said cylinder from turning relative to said housing.