Barrel having tumbler plates for a cylindrical lock

A barrel having tumbler plates for a cylindrical lock, said barrel comprisng a cylindrical body having a center cavity communicating laterally of the axis of the body with two diametrically opposed cylindrical surfaces of the body to form openings in said surfaces, and a core of plastic material insertable at one end of said center cavity and passing thereinto to occupy said cavity, and having a plurality of radial slots said slots registering with said openings, a plurality of tumbler plates each tumbler plate being received within a corresponding one of said slots and a plurality of return springs each one of which is associated with a corresponding one of said plates, each of said springs extending between an opposed shoulder of its associated tumbler plate and a shoulder within the slot within which the plate is located to bias the plate outwardly of the slot, a substantially rigid second shoulder on the plate facing in the direction in which the plate is biased by said spring, an elastically deflectable boss formed on a surface of said slot and defining a shoulder confronting said rigid shoulder of said plate whereby said plate is insertable into said slot only from that end towards which the plate is biased by the spring and only upon deflection of said boss and after insertion into slot is prevented from being removed by interengagement of said second shoulder of the plate and said shoulder of the boss, said center cavity of the body comprising at least one ramp extending from said one end of said cavity and which terminates in a shoulder and said core comprising a complementary profile which terminates in a projection which clips onto the shoulder of said ramp at the end of the introduction of said core into said body to prevent the removal of said core from said one end, a stop means within the cavity against which the core abuts when inserted to limit the extent to which said core can be inserted into said cavity from said one end.