Patent ID: 7490729

Claim:
Center buffer coupling for railroad cars with a coupling head and a coupling shaft that holds the coupling head on its front end and the rear end which is flange-mounted on the frame of the railroad car so that it can swivel horizontally, wherein: one section of the coupling shaft is formed of a first partial piece and a second partial piece that are connected to each other by way of both a first bolt and at least one second bolt, the first bolt and the at least one second bolt constituting an overload safety device; the at least one second bolt of said overload safety device is designed to break and/or shear off when a specific force is exceeded in the longitudinal or transverse direction of the coupling shaft; the first bolt of said overload safety device is designed to serve as a pivot pin for swiveling the first partial piece and the second partial piece of said one section of the coupling shaft relatively to each other after the at least one second bolt is broken and/or sheared off; the first bolt and the at least one second bolt are arranged in succession in axial direction of the coupling shaft; the at least one second bolt is inserted in the vertical round hole running through the two partial pieces; a slotted hole is provided in the first partial piece and the second partial piece, said slotted hole having a slot length which extends in the direction of the coupling shaft; and the first bolt is inserted in said slotted hole in such a way that, after response of the at least one second bolt, the two partial pieces can swivel with respect to each other in a horizontal plane around the first bolt and also can be slid in a linear manner in the direction of the slot length of the slotted hole.