Coupling head housing of a central buffer coupling

A coupling head housing of a central buffer coupling for rail vehicles, the coupling head housing having a coupling lock and an articulated coupling ring, the coupling head housing comprising:

• a vertical front surface;
• a centering projection, located on one side of said front surface, said centering projection having an inner lateral surface facing a vertical central longitudinal plane of the coupling head housing and having an outer lateral surface, said outer lateral surface defining an oblique inner guide surface, said inner guide surface vertical central longitudinal plane as well as said outer lateral surface taper into an elongated, vertically extending, cam-like cone tip;
• a funnel extending into an inside of said coupling head housing, said funnel being symmetrical to said centering projection, said funnel being provided on another side of said front surface for receiving a centering projection of an opposite coupling head of a same design, so that guides are formed by said inner guide surface of said projecting centering projection for coupling an opposite coupling head housing, said cone tip and a corresponding deepening portion of said funnel being displaced toward a vertical central longitudinal plane a of the coupling head housing, so that a distance A from said cone tip to said vertical central longitudinal plane a and a distance A from said deepening portion to said vertical central longitudinal plane a is approximately 2/5of a horizontal distance B between said vertical central longitudinal plane a and an opposite side of said centering projection and a horizontal distance B between said vertical central longitudinal plane a and an opposite side of said funnel deepening portion;
• a height C of said centering projection and a height of an opening of said funnel corresponding to said height C are less than 1 cm smaller than said horizontal distance B;
• an amount of projection D of said centering projection in front of said front surface is approximately 0.65 times said height C, and a fulcrum point of the coupling lock is located at a distance E, which is approximately 0.47 times said height C, from said front surface in said vertical central longitudinal plane a of said coupling head.