Device for forming expansion joints between fields of floor covering laid on a raw floor

Abstract

A device for forming expansion joints between the fields of a floor covering laid on a raw floor, comprises limiting sections that are tied to the edges of the floor covering limiting the joint, as well as to the corresponding fastening mortar. The two limiting sections are joined with each other in a sliding manner parallel with the fields of the floor covering. The two limiting sections have approximately U-shaped cross sections. In their sliding connection, in which the two limiting sections are directed against each other, they jointly have a cross section in the form of a double “T”.

What is claimed is:  
     
         1 . A device for forming expansion joints between fields of floor covering laid on a raw floor with fastening mortar, comprising: 
 at least two limiting sections adapted to be tied to each of the edges of the floor covering defining the joints, and in the corresponding fastening mortar, each section being identical to the other and having an approximately U-shaped cross section with two lateral legs and a middle bridge section,    wherein when one section is turned by 180° against the other, one of the legs of each section engages an open pocket formed in an opposite leg of the other section to slidingly join the two sections together.    
     
     
         2 . The device according to    claim 1   , wherein the two limiting sections jointly form a cross section in the form of a double “T” when the sections are turned 180° against the other.  
     
     
         3 . The device according to    claim 2   , wherein the bridge sections and the legs-of the limiting sections form at least one chamber for receiving fastening mortar, said chambers being open toward a fastening side.  
     
     
         4 . The device according to    claim 1   , wherein the pockets are formed in an area between the bridge section and the lateral legs on at least one side of each limiting section, said pockets each being engaged in a sliding manner by the legs of the other limiting section.  
     
     
         5 . The device according to    claim 1   , wherein each of the legs engaging the pockets is formed by two layers on an end side.  
     
     
         6 . The device according to    claim 5   , wherein a section of each lateral leg that engages one of the pockets is shaped curved inwards by the thickness of the corresponding opposite leg.