Levelling spacer device

Abstract

A levelling spacer device ( 10 ) for the laying of slab-like products (P) for coating surfaces, comprising: at least one base ( 20 ) having a lower surface ( 21 ) and an opposite upper surface ( 22 ); a spacer bridge ( 30 ) perimetrically delimiting a through opening ( 40 ) adapted to be crossed by a pressure wedge ( 50 ) along a crossing direction (C), wherein the bridge ( 30 ) is provided with: two legs ( 31 ) mutually placed side by side along a flanking direction (D) orthogonal to the crossing direction (C) and each protruding from a respective portion of the upper base ( 20 ) surface ( 22 ), in an orthogonal direction with respect thereto; and a crosspiece ( 32 ), which joins the top of the two legs ( 31 ) along the flanking direction (D); each leg ( 31 ) of the bridge ( 30 ) being frangibly connected to the respective base portion by means of a respective predetermined fracture line ( 310 ), wherein the fracture line ( 310 ) comprises: a longitudinal cut ( 3100 ) developing for a predetermined section of the width of the respective leg ( 31 ) with a longitudinal axis (A) parallel to the flanking direction (D); and at least one trigger element ( 3101 ) of the fracture localized in a predetermined trigger zone of the longitudinal cut ( 3100 ) along the longitudinal axis thereof (A).

1 . A levelling spacer device for the laying of slab-shaped products for coating surfaces, comprising:
 at least one base having a lower surface and an opposite upper surface defining a bearing plane for two tiles placed side by side;   a spacer bridge perimetrically delimiting a through opening adapted to be crossed by a pressure wedge along a crossing direction, wherein the bridge is provided with:
 two legs mutually placed side by side along a flanking direction orthogonal to the crossing direction and each protruding from a respective portion of the upper base surface, in an orthogonal direction with respect thereto; and 
 a crosspiece, which joins the top of the two legs along the flanking direction; 
   
       each leg of the bridge being frangibly connected to the respective base portion by means of a respective predetermined fracture line, wherein the fracture line comprises:
 a longitudinal cut developing for a predetermined section of the width of the respective leg with a longitudinal axis parallel to the flanking direction; and 
 at least one trigger element of the fracture localized in a predetermined trigger zone of the longitudinal cut along the longitudinal axis thereof. 
 
     
     
         2 . A device according to  claim 1 , wherein the trigger element is localized close to at least one axial end of the longitudinal cut. 
     
     
         3 . A device according to  claim 2 , wherein the trigger element is placed at a predetermined non-zero distance from the proximal axial end of the longitudinal cut. 
     
     
         4 . A device according to  claim 1 , wherein the trigger element is a through hole in the thickness of the respective leg with transverse through axis with respect to the longitudinal axis of the longitudinal cut, which incises the longitudinal cut in the predetermined trigger zone. 
     
     
         5 . A device according to  claim 4 , wherein the through hole has a section transverse to the through axis surrounded by a closed perimeter. 
     
     
         6 . A device according to  claim 5 , wherein the closed perimeter is contained in the respective leg. 
     
     
         7 . A device according to  claim 1 , wherein the trigger element is a transverse cut, which incises the longitudinal cut in the predetermined trigger zone. 
     
     
         8 . A device according to  claim 1 , wherein the trigger element defines the trigger zone of the longitudinal cut having a minimum thickness of the entire leg smaller than the minimum section of the longitudinal cut outside the trigger zone. 
     
     
         9 . A device according to  claim 1 , wherein the longitudinal cut is placed at a predetermined distance from the lower surface of the base, which is such as to be arranged below the level of a surface, in view, of the tiles resting on the base with a support surface thereof opposite to the surface in view thereof. 
     
     
         10 . A device according to  claim 9 , wherein the predetermined distance of the longitudinal cut from the lower surface of the base is smaller than a distance between the upper surface and the lower surface of the base. 
     
     
         11 . A device according to  claim 1 , which comprises a pair of trigger elements, separated from each other along the longitudinal axis of the longitudinal cut. 
     
     
         12 . A device according to  claim 11 , wherein each trigger element of the pair of trigger elements is placed close to a respective axial end of the longitudinal cut. 
     
     
         13 . A device according to  claim 12 , wherein each trigger element of the pair of trigger elements is placed at a predetermined non-zero distance from the respective proximal axial end of the longitudinal cut.