METHOD AND DEVICE FOR RAIL FASTENING TO RAIL CHAIR Russian patent published in 2007 - IPC E01B9/48 

FIELD: rail road building, particularly for releasable fixed rail connection with sleepers.

SUBSTANCE: method involves inserting clamp projection in ledge groove and arranging working section on upper surface of rail base. Before clamp insertion working section, which may be installed in two stable positions and central unstable one, is brought into the first stable position in which working station is spaced maximal distance from rail base surface. After clamp projection insertion in the ledge groove, working section is moved into the second stable position through central unstable position. In the second stable position working section rests upon upper surface of rail base. Device for rail fastening to rail chair comprises working section to provide resilient contact with upper surface of rail base and projection extending along axis of outline symmetry. Device also has intermediate sections, which connect working section with projection. Clamp has closed outline. The working section is bent and defines arch in plane transversal to axis of clamp outline symmetry. The working section may pass from the first stable position, in which working station is spaced maximal distance from rail base surface, into the second stable position, in which the working section abuts against upper surface of rail base, through central unstable position.

EFFECT: reduced time and labor inputs for clamp assemblage due to possibility of applying force considerably lesser than force, which presses rail to chair.

8 cl, 4 dwg