Starting switch with mobile core comprising a directly mounted closure cup

A contractor (30) for a starter (10) of a combustion engine, comprising an annular fixed coil (34) which surrounds a cylindrical magnetic core (32) mounted for axial sliding movement in a bore of the fixed coil (34), in which a rear portion of the movable magnetic core (32) projects axially outside the fixed coil (34), in which an external return spring (58) for the movable magnetic core is in axial engagement against an external radial flange (56) carried by the rear portion of the movable magnetic core (32), in which the movable magnetic core (32) has an internal bore (36) which is open at a rear end (52), disposed in front of the flange (56), and in which a rear end of a coupling rod (26) having a front end passes through, the rear end of the coupling rod being coupled to a lever (20) for actuating an actuator pinion (14) which is urged elastically towards the front of the bore (36) by an internal spring (38) mounted in axial compression against a front shoulder surface of the coupling rod (26) and a rear shoulder surface (42) of the movable magnetic core (32), the front end of the coupling rod being arranged to engage on a base element (48) at the front of the bore so as to be driven in straight line movement by the movable magnetic core (32) of the starter, characterized in that the base element (48) of the bore (36) is formed integrally with the body of the movable magnetic core (32), in that a capping piece (54) attached to the rear end (52) of the movable magnetic core (32) includes the rear shoulder surface (42) of the bore (36) of the movable magnetic core (32) and the external flange (56) and in that external flange (56) is arranged at the rear end of the capping piece (54), and in that the shoulder surface (42) of the bore of the movable magnetic core (32) constitutes a front base element (62) of the capping piece (54), which is pierced for passage of the coupling rod (26) through it, and which is in axial forward abutment against the rear end face of the body of the core.