Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/102—Woven scrim
  • Y10T442/109—Metal or metal-coated fiber-containing scrim

Definitions

• the present invention relates to a net structure formed by knitting metallic cables, a protective net against the fall of one or more heavy bodies, such as stone blocks, formed from said structure, and a protective device against the fall of such heavy bodies.
• each mesh that this net structure comprises is connected to the laterally adjacent mesh by a breakable junction piece, this junction piece having a rupture threshold significantly lower than that of the cables constituting the structure of the net.
• the rupture threshold of the junction piece can in particular be of the order of a quarter of the rupture threshold of these cables.
• the junction pieces make it possible to normally maintain the meshes in a position close to one another, so that, for a given number of meshes, the surface of the net according to the invention is smaller than the surface of a net of the same type. knitting structure, for the same number of stitches without joining pieces.
• the rupture of the junction pieces is interrupted when the energy transmitted by the fall of the body becomes insufficient to cause these ruptures.
• the net structure according to the invention allows greater energy absorption without breaking the cables, therefore without breaking the integrity of the structure of the net.
• the knitting of the cables is of the "Jersey" type.
• Junction pieces may include open metal sleeves crimped onto cables or pieces of the chain link type.
• each cable or portion of cable constituting a row of meshes forms successive "S" defining inverted loops of circular shape, and the connecting pieces bring together the adjacent cable strands of the adjacent meshes ; each cable or portion of cable constituting the row of meshes immediately adjacent to that mentioned above has a structure identical to that of this first row of meshes, and the portion of cable forming a mesh of this second row of meshes fits into a corresponding mesh of said first row of stitches, goes behind the strands of the two adjacent stitches of this first row of stitches and emerges from the adjacent stitch.
• each cable or portion of cable constituting a row of meshes forms successive piriform loops, in "lowercase e", and the connecting pieces bring together the strands of adjacent cables of the adjacent meshes; each cable or portion of cable constituting the row of meshes immediately adjacent to that mentioned above has a structure identical to that of this first row of meshes, the portion of cable forming a mesh of this second row of meshes entering a corresponding mesh of said first row of stitches, passing behind the two strands of the two adjacent stitches of this first row of stitches and emerging from the adjacent stitch.
• the net according to the invention is formed from the structure described above. When it has a length and a width, in particular when it has a rectangular shape, the length of the meshes can be oriented parallel or perpendicular to the length of the net.
• the net has a length of 10 m and a width of 6 m;
• the diameter of the cables used is 12 mm;
• the elasticity of the cables is at most 1.15% before breaking; - the cable breaking threshold is 84 kN;
• the protection device according to the invention comprises a net as defined above.
• Figure 1 is a plan view of a portion of cable which it comprises according to a first embodiment, constituting a series of successive loops intended to form meshes;
• Figure 2 is a plan view of the net structure including a series of cable portions of the same conformation as that shown in Figure 1, knitted together;
• Figure 3 is a plan view of a similar structure, with an alternative embodiment in knitting;
• Figure 4 is a plan view of a portion of cable that includes the net structure according to a second embodiment, constituting a series of successive loops intended to form meshes;
• Figure 5 is a plan view of the net structure including a series of cable portions of the same conformation as that shown in Figure 4, knitted together;
• FIG. 6 is a plan view of a net formed from the structure shown in FIG. 2
• FIG. 7 is a plan view of another net formed from the structure shown in FIG. 2.
• FIG. 1 represents a portion of cable 1 forming successive "S" s which define inverted loops 2 of circular shape.
• the adjacent cable strands 2a of two adjacent loops 2 are brought together by junction pieces 3 formed by metal sleeves crimped onto these strands 2a.
• junction pieces 3 are breakable and have a rupture threshold clearly lower than that of the cable 1, in particular of the order of a quarter of the rupture threshold of this cable 1.
• the diameter of the circular part that forms each loop 2 is 350 mm
• the diameter of the cable 1 used is 12 mm
• the elasticity of this cable 1 is at most 1.15% before breaking
• the breaking point of cable 1 is 84 kN
• the threshold breaking point of the junction pieces 3 is around 20 kN.
• FIG. 2 represents a structure of net 5 including a series of six portions of cables 1a to 1f of the same conformation as that shown in FIG. 1, knitted together, each loop 2 forming a stitch of this knitted fabric.
• each mesh of a portion of cable considered enters a corresponding mesh of the portion of cable immediately adjacent, passes behind the strands 2a of the two adjacent meshes of this portion of cable and emerges from the adjacent mesh.
• FIG. 3 represents a similar structure 5, in which the knitting of the portion 1b to the portion 1a, of the portion 1d to the portion 1c and of the portion 1f to the portion 1e differs, however: each stitch of a portion 1b, 1d or 1f leaves a corresponding mesh of the portion 1a, 1c or 1e respectively, passes in front of the strands 2a of the two adjacent meshes of this portion of cable 1a, 1c or 1e and enters the adjacent mesh.
• FIG. 4 represents a portion of cable 10 forming successive piriform loops 12, in "lowercase e".
• the adjacent cable strands 12a of two adjacent loops 12 are brought together by junction pieces 3 identical to those described above.
• FIG. 5 represents a net structure 50 including a series of six portions of cables 10a to 10f of the same conformation as that shown in FIG. 4, knitted together, each loop 12 forming a stitch of this knitted fabric.
• each mesh of a portion of cable considered enters a corresponding mesh of the immediately adjacent portion of cable, passes behind the strands 12a of the two adjacent meshes of this portion of cable and emerges from the adjacent mesh.
• Figures 6 and 7 show rectangular nets 100, 101 formed from the structure 5.
• the length of the meshes 2 is oriented parallel to the length of the net, while in in the case of the net 101 shown in FIG. 7, the length of the meshes 2 is oriented perpendicular to the length of the net.
• the invention brings a decisive improvement to the prior art, by providing a net structure 5, 50 having a high power of dissipation of the energy transmitted by the fall of a body.
• the junction pieces make it possible to normally maintain the meshes in a position close to one another, so that, for a given number of meshes, the surface of the net according to the invention is smaller than the surface of a net of the same knitting structure, for the same number of stitches.
• the junction pieces 3 break successively, starting from the point of impact and radiating from this one, releasing the assembly of meshes. These successive ruptures allow part of the energy transmitted by the body to be absorbed and also allow the possibility of additional deformation of the net to be released. This additional deformation generates, when it occurs, friction between the cables, which contributes to the absorption of the energy transmitted by the fall of the body.
• the rupture of the junction pieces 3 is interrupted when the energy transmitted by the fall of the body becomes insufficient to cause these ruptures.
• the net structure according to the invention allows absorption of the energy transmitted by said body without breaking the cables, therefore without breaking the integrity of the net structure.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Wire Processing (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Knitting Of Fabric (AREA)
• Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
• Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
• Ropes Or Cables (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
• Laminated Bodies (AREA)
• Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29226223

Family Applications (1)

Country Status (10)

Families Citing this family (5)

Family Cites Families (11)

• 2002
  • 2002-05-06 FR FR0205651A patent/FR2839322B1/fr not_active Expired - Fee Related
• 2003
  • 2003-04-30 US US10/513,513 patent/US20050148251A1/en not_active Abandoned
  • 2003-04-30 AU AU2003265532A patent/AU2003265532A1/en not_active Abandoned
  • 2003-04-30 WO PCT/FR2003/001366 patent/WO2003093553A1/fr not_active Ceased
  • 2003-04-30 EP EP03740689A patent/EP1501971B1/de not_active Expired - Lifetime
  • 2003-04-30 DE DE60319359T patent/DE60319359D1/de not_active Expired - Lifetime
  • 2003-04-30 AT AT03740689T patent/ATE387529T1/de active
  • 2003-04-30 ES ES03740689T patent/ES2300596T3/es not_active Expired - Lifetime
  • 2003-04-30 CA CA2483962A patent/CA2483962C/fr not_active Expired - Lifetime
• 2004
  • 2004-01-06 NO NO20040038A patent/NO323399B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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