RAIL JOINT EXPANDER Russian patent published in 2007 - IPC E01B29/20 E01B29/46 B66F19/00 

FIELD: railway transport; track instruments.

SUBSTANCE: invention relates to mechanized track instruments with hydromechanical drive to act onto rail length or track skeleton, particularly, to instruments for longitudinal shifting of rails or rail tracks. Proposed expander contains two housing with four wedges whose side contact surface is provided with skew teeth and with lever wedge shifting mechanisms, two hydraulic cylinders, whose sleeves and rods are connected with housing by cylindrical pins on end faces by means of vertical axles. Hydraulic drive to provide relative displacement of rods and sleeves is mounted on one of housing. Four liable bushings are located between bores of housing and pins of sleeves and rods. Holes in pins for vertical axles are made with X-shaped double-cone groove. Each housing is provided with two additional bores to accommodate spherical washers. Sleeves and rods of each hydraulic cylinder are provided with bores to accommodate conical washers with possibility of contacting of their cones with spheres of spherical washers.

EFFECT: improved efficiency of operation of rail expander owing to better self-alignment of housing on rails in any planes and to more reliable adhesion of side contact surfaces of wedges with side surfaces of heads of worn-out rails.

3 cl, 8 dwg