Patent ID: 7445398

Claim:
A coupling spring pin comprising: (a) a base spring element made of a plastic material and comprising a flange and at least two bent spring tongues extending downwards from the flange; and (b) a bolt connected to the spring element extending upwardly perpendicularly from the flange opposite the spring tongues and comprising an inner core unitarily formed of the plastic material and an outer cylindrical bolt case made of metal abutting the flange, wherein the bolt case has an opening at each of its longitudinal end regions and the plastic material of the inner core protrudes from the openings at the longitudinal end regions, and wherein the bolt case is provided with an annular groove in its lower region abutting the flange and the plastic material of the flange extends upwardly and annularly wraps around the longitudinal end of the bolt case abutting the flange and fills the annular groove, thereby connecting the bolt case to the spring element in an undetachable and stable manner.