Spring Tube And A Spring Pack For Spring Mattresses

Abstract

A spring tube ( 1 ) encloses in known way a plurality of springs ( 2 ) arranged side by side, with facing parts of the wall ( 11 ) of the tube ( 10 ) joined, between one spring ( 2 ) and a subsequent spring, by welding lines ( 12 ), so that each spring ( 2 ) is contained in a portion ( 13 ) of tube ( 10 ), closed and separated from adjacent portions ( 13 ). The welding lines ( 12 ) have a predetermined minimum width (L) and are cut from one side of the tube inwards, so that each of the closed portions ( 13 ), containing a spring ( 2 ), can be compressed without any effect on the adjacent portions ( 13 ). this improves comfort while using a mattress manufactured with grouped spring packs (S) obtained from the spring tube ( 1 ). According to a second preferred embodiment, the spring tube ( 1 ) is cut along the welding lines at both sides.

1 . A spring tube for spring mattresses, including a continuous tube ( 10 ), and a plurality of springs ( 2 ) enclosed into the tube and arranged side by side, at a selected distance, with facing parts of the tube walls ( 11 ) between one spring ( 2 ) and a subsequent one, joined by welding lines ( 12 ), so that each spring ( 2 ) is contained in a respective portion ( 13 ) of said tube ( 10 ), closed and separated from the adjacent portions ( 13 ), with said spring tube ( 1 ) characterized in that longitudinal cuts ( 120 ) are made along said welding lines ( 12 ) starting from at least one side of the spring tube ( 10 ) and extending inwards, to form at least one tubular segment ( 130 ) for each portion ( 13 ) of said portions ( 13 ). 
   
   
       2 . A spring tube according to  claim 1 , wherein said welding lines ( 12 ) are made parallel to the axes (A) of the springs ( 2 ). 
   
   
       3 . A spring tube according to  claim 1 , wherein each cut of said cuts ( 120 ) is made in a central part of the relevant welding line ( 12 ). 
   
   
       4 . A spring tube according to  claim 1 , wherein said welding lines ( 12 ) have a predetermined minimum width (L) sufficient to keep the relevant portions ( 13 ) sealed after the cuts ( 120 ) are made. 
   
   
       5 . (canceled) 
   
   
       6 . A spring tube according to  claim 1 , wherein two opposite cuts ( 120 ) are made for each welding line ( 12 ) starting from opposite sides of the spring tube ( 1 ) and extending inwards. 
   
   
       7 . A spring tube according to  claim 6 , wherein said opposite cuts ( 120 ) have equal length. 
   
   
       8 . A spring tube according to  claim 1 , wherein said springs ( 2 ) have different elastic behavior, so as to define differentiated softness areas. 
   
   
       9 . A spring pack for spring mattresses, obtained by cutting the spring tube of  claim 1 . 
   
   
       10 . A spring tube according to  claim 2 , wherein each cut of said cuts ( 120 ) is made in a central part of the relevant welding line ( 12 ). 
   
   
       11 . A spring tube according to  claim 6  wherein said opposite cuts ( 120 ) extend inwards for a predetermined depths (H).