System for Fastening a Rail to a fixed Bottom Support, and Fastener for a Rail

Abstract

The invention provides a system for fastening a rail in place and a rail fastener which, while being simple to install, allow a large measure of freedom in the production of the components required and at the same time have great practical utility. To this end a system according to the invention for fastening a rail to a fixed bottom support: a base plate produced from a plastics material, an intermediate layer which is arranged between the base plate and the fixed bottom support, a carrier plate which is arranged between the intermediate layer and the bottom support, a resilient member to hold down the rail which is to be fastened in place, a clamping bolt to brace the resilient member against the base plate, and a fastening member for fastening the base plate to the fixed bottom support.

1 . A system for fastening a rail to a fixed bottom support, comprising:
 a base plate produced from a plastics material,   an intermediate layer which is arranged between the base plate and the fixed bottom support,   a carrier plate which is arranged between the intermediate layer and the bottom support,   a resilient member to hold down the rail which is to be fastened in place,   a clamping bolt to brace the resilient member against the base plate, and   a fastening member for fastening the base plate to the fixed bottom support.   
     
     
         2 . The according to  claim 1 , wherein there is formed or moulded in the base plate at least one opening for a sleeve, in which the opening for a sleeve and a hold-down sleeve are put in a sliding fit, the height of which hold-down sleeve is greater than the thickness of the base plate in the region of the opening for a sleeve associated with it and which hold-down sleeve has a projection protruding from its circumferential surface which bears against than upper side of the base plate in a fully installed state, and in that the fastening member is intended to be inserted through an opening of the hold-down sleeve. 
     
     
         3 . The system according to  claim 2 , wherein the hold-down sleeve takes the form of an eccentric sleeve, in that there are formed, in the opening for the sleeve, markers for indexing which are arranged at a spacing from one another such that, allowing for the eccentricity of an axis of rotation of the eccentric sleeve from a central longitudinal axis of the opening for the sleeve, the markers for indexing define positions in rotation of the eccentric sleeve if the eccentric sleeve is adjusted in rotation about its axis of rotation in the opening for the sleeve, which positions in rotation correspond to a step-by-step change in the position of the base plate by a defined amount, and in that the eccentric sleeve has a shaped member corresponding to the markers for indexing in the opening for the sleeve by means of which shaped member the eccentric sleeve inserted in the opening for a sleeve associated with the said eccentric sleeve is coupled by positive-fit to a given one of the markers for indexing in the opening for the sleeve. 
     
     
         4 . The system according to  claim 1 , wherein a stiffening structure formed by ribs and by depressions present between the ribs is formed or moulded in an underside of the base plate, which underside is associated with the fixed bottom support, and, wherein depressions of the stiffening structure are closed off with a filling material. 
     
     
         5 . The according to  claim 1 , wherein the intermediate layer is elastic and, wherein there is formed on an underside of the base plate at least one projection which points away from the underside and by which, when the system is fully installed, a limit is set for the travel by which the base plate sinks, as a result of elasticity of the elastic intermediate layer, when a railway vehicle travels over the rail. 
     
     
         6 . The system according to  claim 1 , wherein the intermediate layer is elastic and, wherein there is formed on the carrier plate a projection which, when the carrier plate is in an installed state, points towards the base plate and by which, when the system is fully installed, a limit is set for the travel by which the base plate sinks, as a result of elasticity of the elastic intermediate layer, when a railway vehicle travels over the rail. 
     
     
         7 . The system according to  claim 6 , wherein the projection on the carrier plate forms a receptacle for the elastic intermediate layer. 
     
     
         8 . The system according to  claim 1 , wherein:
 there is formed or moulded in the base plate a through-opening which runs from an upper side of the base plate to an underside of the base plate and through which the clamping bolt can be inserted from the underside,   a receptacle is formed or moulded in the underside of the base plate in the region of the mouth of the through-opening, in which receptacle a polygonal head of the clamping bolt is seated in a fully installed state, the polygonal head comprising side faces, and   each side-face of the bolt head has associated with it a face for contact which is formed on a circumferential wall of the receptacle and which extends for part of the length of whichever is the associated side-face of the bolt head and against which the relevant side-face of the bolt head has, in the installed state, planar support, the faces for contact on the circumferential wall being arranged to be spaced apart from one another and there being formed or moulded in the circumferential wall of the receptacle, between each pair of adjacent faces for contact, a recess in a region of which there is no contact between the bolt head and the circumferential wall of the receptacle in the fully installed state.   
     
     
         9 . The system according to  claim 1 , wherein the base plate has on an upper side a supporting surface for the rail which is to be fastened in place, which supporting surface is bounded by respective supporting shoulders at its longitudinal sides of the supporting surface which are aligned in a longitudinal direction of the rail which is to be fastened in place. 
     
     
         10 . The system according to  claim 9 , wherein at least one adapter piece is provided to bridge a gap which exists in an installed state between a foot of the rail which is to be fastened in place and the given supporting shoulder. 
     
     
         11 . The system according to  claim 10 , wherein the adapter piece can be detachably coupled by positive-fit to the supporting shoulder which is associated with it in the given case. 
     
     
         12 . The system according to  claim 9 , wherein an elastic layer on which the rail stands in the fully installed state is applied to the supporting surface. 
     
     
         13 . The system according to  claim 1 , wherein at least one clip is provided which, for installation, holds together in a pre-assembled position a pack made up of the base plate, the intermediate layer situated below it and the carrier plate situated below the intermediate layer. 
     
     
         14 . A fastener for a rail, formed by a system designed in accordance with  claim 1 .