Patent attributes
A wafer-type tumbler cylinder comprises a sleeve, a cylinder, a plurality of first and second wafers, some springs and some U-shaped fixtures. The wafer-type tumbler cylinder is an integral cylindrical shaft having indentations, fixing slots and riveting plates made in a consistent operation. After the placement of every pair of first and second wafers and one shared spring into the cylindrical shaft, the riveting plates are pressed into a horizontal position to secure the wafers and spring; furthermore, all the indentations, first and second wafers, springs and riveting plates are installed on one side, or on both sides of the cylindrical shaft. The improved structure of riveting plates, U-shaped fixtures and shared spring for every pair of first and second wafers enables the key to move forward and backward smoothly, and also enables the users to lock and unlock easily and successfully.
