Bogie trucks for rail vehicles

Claim 1

FRICTIONAL DAMPING MEANS FOR THE BOLSTER OF A BOGIE TRUCK, COMPRISING A FRICTIONAL SHOE FOR CONTACT WITH A SIDE WEARING SURFACE ON THE BOLSTER, COLLECT-LIKE MEMBERS BETWEEN WHICH SAID SHOE IS MOUNTED, EACH OF SAID COLLET-LIKE MEMBERS BEING FORMED WITH AN INCLINED PRESSURE SURFACE, SAID PRESSURE SURFACES BEING OPPOSITELY INCLINED WITH RESPECT TO ONE ANOTHER AND ENGAGING PRESSURE SURFACES ON SAID SHOE, A HOUSING FOR SAID SHOE AND COLLECT-LIKE MEMBERS, BEARING SURFACES IN SAID HOUSING ON WHICH SAID COLLET-LIKE MEMBERS ARE SLIDABLY MOUNTED, SPRING MEANS ACTING ON SAID COLLET-LIKE MEMBERS TO URGE THE PRESSURE SURFACES THEREON INTO ENGAGEMENT WITH THE PRESSURE SURFACES ON SAID SHOE AND TO URGE SAID SHOE INTO FRICTIONAL CONTACT WITH SAID BOLSTER SIDE WEARING SURFACE, THE COLLETLIKE MEMBERS HAVING FURTHER SURFACES WHICH ENGAGE EACH OTHER TO PREVENT SAID MEMBERS TWISTING IN THE HOUSING OR TILTING THEREIN TO ANY MARKED EXTENT IN A LONGITUDINAL PLANE.