Numbering device for molded or cast parts

A marking device for a molded part comprising:

• a main body having a first end and a second end, the first end having indicia disposed thereon;
• a marking assembly disposed in said main body, said marking assembly including a plurality of concentric rotatable cylinders, each of the cylinders having a marker formed thereon for marking the molded part, whereby a rotation of the cylinders causes a corresponding movement of the markers and a rotation of at least one of the cylinders is caused by a rotation of another of the cylinders, the markers of the cylinders cooperating with the indicia of said main body to provide identifying information for the molded part;
• an indexing assembly disposed in said main body adjacent said marking assembly, said indexing assembly including a piston and an indexing member, said indexing assembly being operatively engaged with said marking assembly whereby a movement of said indexing assembly causes a movement of at least one of the cylinders of said marking assembly;
• and
• a cap adapted to be in selective communication with a source of pressure fluid which causes the piston to be reciprocated to cause the indexing member to rotate the at least one of the cylinders wherein the piston includes a pair of diametrically opposed tabs having a camming slot formed therein, the camming slots cooperating with a pair of radially outwardly extending arms of the indexing member to cause the indexing member to rotate the at least one of the cylinders.