One piece plastic molded structural unit and door knocker constructed therefrom

An integrally connected one piece molded synthetic organic resin structure, for easy assembly into a door knocker capable of producing a predetermined audible sound, comprising a synthetic organic resin base having at least a portion of the rear surface thereof flat, a synthetic organic resin arm connected to said base at spaced apart points by at least two relatively thin struts, each of the struts being easily severed to separate said arm from said base, at least one boss receiving means on one of said arm and the front surface of said base and integral therewith, at least one boss on the other of said arm and the front surface of said base and integral therewith extending therefrom sized to snap fit within said boss receiving means and to be frictionally engaged and maintained thereby, said arm having a size such that when said boss and said boss receiving means are frictionally engaged said arm has a free end thereof overlying a portion of said base which is normally urged toward said base, said arm being flexible to permit the free end thereof when said boss is frictionally engaged and maintained by said boss receiving means to be bent away from said base without breaking said arm, said boss and boss receiving means cooperating with said arm thus mounted on said base to cause said arm to snap back toward and against said base upon release of said arm from the bent away position thereof, thereby striking said base with a predetermined force to make an audible sound.