EP0802274A1 - Verfahren zur Herstellung einer Seilschlinge sowie danach hergestellte Seilschlinge - Google Patents

Verfahren zur Herstellung einer Seilschlinge sowie danach hergestellte Seilschlinge Download PDF

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Publication number
EP0802274A1
EP0802274A1 EP97450006A EP97450006A EP0802274A1 EP 0802274 A1 EP0802274 A1 EP 0802274A1 EP 97450006 A EP97450006 A EP 97450006A EP 97450006 A EP97450006 A EP 97450006A EP 0802274 A1 EP0802274 A1 EP 0802274A1
Authority
EP
European Patent Office
Prior art keywords
diameter
rope
strop
core
end portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97450006A
Other languages
English (en)
French (fr)
Other versions
EP0802274B1 (de
Inventor
Guy Fargamel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
G. FARGAMEL, S.A.
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0802274A1 publication Critical patent/EP0802274A1/de
Application granted granted Critical
Publication of EP0802274B1 publication Critical patent/EP0802274B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/16—Auxiliary apparatus
    • D07B7/165—Auxiliary apparatus for making slings

Definitions

  • the present invention relates to a method of manufacturing a rope strop and the strop thus obtained.
  • a finished strop is thus obtained, that is to say a loop comprising five strands of the same rope on a core formed by the ends of this rope.
  • Known strops have only five strands, so that the resistance is decreased compared to a strop comprising six strands which is mechanically logical but also because of the tight stranding pitch which leads to more pronounced angles which makes lose resistance to the whole.
  • the number five is determined by the geometric rules which make it possible to accommodate six circles of a given diameter around and tangent to a central circle of the same diameter, but that it is impossible to accommodate six oval sections whose large diameter is substantially parallel to a tangent to the central circle.
  • the present invention provides a method of manufacturing a strand with six strands which is of a resistance of the order of 20% greater because on the one hand, a sixth strand is provided and on the other hand, The stranding angle is reduced to reduce the large diameter of the oval cross section of each strand so that it also contributes to the increase in final strength. Indeed, the pitch is much larger and it is no longer necessary to fill the clearances between the strands.
  • the method according to the invention is economical, especially in its main embodiment, and it does not require any investment for a company in the environment in question, manufacturing such products.
  • the subject of the invention is also the strand with six strands thus obtained.
  • FIG. 1 there is shown a strop 10 with, externally, strands on a core 12, symbolized in broken lines in this figure, with a point of penetration 14 of the free end portions 16 and 18 of the stranding cord 20 , forming said core, with a junction point 19.
  • the method according to the invention makes it possible to produce a strop whose cross section is shown in FIG. 3.
  • This strop comprises six strands I , II , III , IV , V and VI of a diameter D2 around a core 12 of a diameter D1 .
  • Each strand is an ellipse whose minor axis d1, equal to D2 , is of a dimension smaller than that of the major axis d2 .
  • the major axis d2 is very slightly less than or equal to D1 , since only six circles can be accommodated with a point of tangency at the periphery of a circle of the same diameter.
  • the diameter D2 must be less than D1 .
  • FIG. 4A Prior to the realization of the strop itself, a special treatment of the rope is provided, FIG. 4A, in order to reduce the diameter of this rope in a given area.
  • the rope is chosen from among the ropes made of a material which allows them to have a certain capacity to contract and therefore to restrict their diameter when they are stretched and which retains this reduced diameter even after traction has ceased.
  • the method consists in preparing a length of rope necessary for the realization of the strop, that is to say approximately 7.5 times the average perimeter C of this strop. Account must be taken of the elongation that this rope will undergo during the implementation of the method as will be explained later.
  • This rope has a nominal nominal diameter.
  • the rope is then immobilized in clamping means 20, symbolized in this FIG. 4A, at precise points located, in the case of a symmetrical core of a length C , at a minimum of 1/2 C of the free end.
  • a traction is then exerted between these two tightening means to ensure the stretching of the cord, in the only middle part, comprised between the tightening means, the diameter of the cord passing from D1 to D2 , with D2 ⁇ D1 .
  • the rope After loosening the tensile force, the rope retains this diameter D2 , in its middle part.
  • the middle part of the strop of the strop at diameter D2 is stranded on a mold 22 which is for example a steel wire, at diameter D1 .
  • the mold is then withdrawn through the strands to the right of the point of introduction 14 and, simultaneously, the end portions of the rope, of diameter D1 , are made to enter the free volume left by the progressive withdrawal of the mold, this with methods known to those skilled in the art.

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  • Ropes Or Cables (AREA)
EP19970450006 1996-04-19 1997-04-18 Verfahren zur Herstellung einer Seilschlinge sowie danach hergestellte Seilschlinge Expired - Lifetime EP0802274B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605185 1996-04-19
FR9605185A FR2747696B1 (fr) 1996-04-19 1996-04-19 Procede de fabrication d'une estrope en cordage et estrope ainsi obtenue

Publications (2)

Publication Number Publication Date
EP0802274A1 true EP0802274A1 (de) 1997-10-22
EP0802274B1 EP0802274B1 (de) 2001-09-05

Family

ID=9491556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970450006 Expired - Lifetime EP0802274B1 (de) 1996-04-19 1997-04-18 Verfahren zur Herstellung einer Seilschlinge sowie danach hergestellte Seilschlinge

Country Status (3)

Country Link
EP (1) EP0802274B1 (de)
DE (1) DE69706465T2 (de)
FR (1) FR2747696B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20170954A1 (en) * 2017-06-13 2018-12-14 Van Beest Norway As A chain formed of linked flexible loops, and an apparatus and a method of manufacture of said loops
DE202018105723U1 (de) * 2018-10-05 2018-11-09 Westdeutscher Drahtseil-Verkauf Dolezych Gmbh & Co. Kg Kette, insbesondere Schwerlastkette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216922A (en) * 1939-05-19 1940-10-08 Macwhyte Company Method of making grommets
DE948040C (de) * 1951-07-10 1956-08-23 Hans Baur Jun Verfahren und Vorrichtung zur Herstellung von endlosen Seilen mit Seele
DE2755605A1 (de) * 1977-12-14 1979-06-21 Guenter Dipl Ing Scheffler Endloses seil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216922A (en) * 1939-05-19 1940-10-08 Macwhyte Company Method of making grommets
DE948040C (de) * 1951-07-10 1956-08-23 Hans Baur Jun Verfahren und Vorrichtung zur Herstellung von endlosen Seilen mit Seele
DE2755605A1 (de) * 1977-12-14 1979-06-21 Guenter Dipl Ing Scheffler Endloses seil

Also Published As

Publication number Publication date
DE69706465D1 (de) 2001-10-11
DE69706465T2 (de) 2003-01-16
EP0802274B1 (de) 2001-09-05
FR2747696A1 (fr) 1997-10-24
FR2747696B1 (fr) 1998-07-17

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