Carriage for grinding undulations in railway track rails

Claim 1

A carriage for grinding undulations in railway track rails, said carriage being provided with a plurality of motorized rotary grinding wheels and means for Relieving the loads of said grinding wheels on the rails, comprising a support linked to the carriage main body so as to be displaced together with the main body along the railway track; a rail grinding apparatus comprising a rigid assembly of at least three grinding units, each comprising a grinding wheel fixed on a shaft, a motor for rotation of the shaft, and a shaft bearing; a weight relieving means comprising a plurality of jacks operatively connected to said apparatus for relieving loads being positioned between said support and the rigid assembly; and complementary links mounted on said support between said assembly and said support and operatively connected to said jacks to enable the assembly to execute slight movements which are imparted to it by the passage of the grinding wheels over the crests of the undulations of the rail, the distance between the peripheries of the grinding wheels and the distance between the edges of the extreme grinding wheels are such as to prevent the penetration by any grinding wheel of a trough of the undulation over which the grinding wheel is crossing, the distance between the edges of the extreme grinding wheels being approximately equal to the amplitude of two wave lengths of the undulations in the rail, said distance between the edges of the extreme grinding wheels being controllable by core means positionable on or between the units.