Net structure formed by the knitting metal wires

Abstract

The invention concerns a net structure ( 5, 50 ) wherein each mesh comprised therein is linked to the laterally adjacent mesh by a breakable junction piece ( 3 ), said junction piece ( 3 ) having a rupture threshold markedly lower than that of the wires constituting the net structure.

1 . A net structure formed by the knitting of metal ropes, characterized in that each mesh which this net structure comprises is connected to the laterally adjacent mesh by means of a breakable junction piece, this junction piece having a breaking threshold markedly lower than that of the ropes forming the net structure.  
   
   
       2 . The net structure as claimed in  claim 1 , characterized in that the breaking threshold of the junction piece is of the order of a quarter of the breaking threshold of these ropes.  
   
   
       3 . The net structure as claimed in  claim 1 , characterized in that the knitting of the ropes is of the Jersey type.  
   
   
       4 . The net structure as claimed in  claim 1 , characterized in that the junction pieces comprise open metal sleeves crimped on the ropes.  
   
   
       5 . The net structure as claimed in  claim 1 , characterized in that the junction pieces comprise pieces of the type consisting of make-up links for a chain.  
   
   
       6 . The net structure as claimed in  claim 1 , characterized in that each rope or rope portion constituting a row of meshes forms successive “S”s defining inverted loops of circular shape, and in that the junction pieces gather together the strands of adjacent ropes of the adjacent meshes; each rope or rope portion constituting the row of meshes which is directly adjacent to that mentioned above has a structure identical to that of this first row of meshes, and the rope portion forming a mesh of this second row of meshes reenters a corresponding mesh of said first row of meshes, passes behind the strands of the two adjacent meshes of this first row of meshes and reemerges from the adjacent mesh.  
   
   
       7 . The net structure as claimed in  claim 1 , characterized in that each rope or rope portion constituting a row of meshes forms successive “S”s defining inverted loops of circular shape, and in that the junction pieces gather together the strands of adjacent ropes of the adjacent meshes; alternately from one row of meshes to the other a rope portion forming a mesh of a row of meshes in question reenters a corresponding mesh of one of the adjacent rows of meshes, passes behind the strands of the two adjacent meshes of this row of meshes and reemerges from the adjacent mesh, and a rope portion forming a mesh of the same row of meshes in question emerges from a corresponding mesh of the other of the adjacent rows of meshes, passes in front of the strands of the two adjacent meshes of this row of meshes and reenters the adjacent mesh.  
   
   
       8 . The net structure as claimed in  claim 1 , characterized in that each rope or rope portion constituting a row of meshes forms successive pear-shaped loops in the form of an e, and in that the junction pieces gather together the strands of adjacent ropes of the adjacent meshes; each rope or rope portion constituting the row of meshes which is directly adjacent to that mentioned above has a structure identical to that of this first row of meshes, the rope portion which forms a mesh of the second row of meshes reentering a corresponding mesh of said first row of meshes, passing behind the two strands of the two adjacent meshes of this first row of meshes and reemerging from the adjacent mesh.  
   
   
       9 . A net for protection against the fall of one or more heavy bodies, such as stone blocks, which is formed from said structure as claimed in  claim 1 .  
   
   
       10 . The net as claimed in  claim 1 , characterized in that it has a length and a width, and in that the length of the meshes is oriented parallel to the length of the net.  
   
   
       11 . The net as claimed in  claim 1 , characterized in that it has a length and a width, and in that the length of the meshes is oriented perpendicularly to the length of the net.  
   
   
       12 . A device for protection against the falls of one or more heavy bodies, such as stone blocks, comprising a net as claimed in  claim 9.