EP1061230B1 - Metal ladder for scaffolding with crimped connection between rungs and stile - Google Patents

Metal ladder for scaffolding with crimped connection between rungs and stile Download PDF

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Publication number
EP1061230B1
EP1061230B1 EP00401613A EP00401613A EP1061230B1 EP 1061230 B1 EP1061230 B1 EP 1061230B1 EP 00401613 A EP00401613 A EP 00401613A EP 00401613 A EP00401613 A EP 00401613A EP 1061230 B1 EP1061230 B1 EP 1061230B1
Authority
EP
European Patent Office
Prior art keywords
rung
section
uprights
rungs
upright
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.)
Expired - Lifetime
Application number
EP00401613A
Other languages
German (de)
French (fr)
Other versions
EP1061230A1 (en
Inventor
Francis Manier
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.)
Tubesca SA
Tubesca SA France
Original Assignee
Tubesca SA
Tubesca SA France
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 Tubesca SA, Tubesca SA France filed Critical Tubesca SA
Publication of EP1061230A1 publication Critical patent/EP1061230A1/en
Application granted granted Critical
Publication of EP1061230B1 publication Critical patent/EP1061230B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/08—Special construction of longitudinal members, or rungs or other treads
    • E06C7/082—Connections between rungs or treads and longitudinal members
    • E06C7/085—Connections between rungs or treads and longitudinal members achieved by deforming the rung or the stile

Definitions

  • the invention relates to a metal scaffolding ladder rungs crimped on the uprights as described in part preamble of claim 1.
  • scaffolding ladders have, for the most part, amounts and steps of circular section, the steps being welded directly to the uprights or attached to them by means of screw. These bindings of the steps to the amounts are relatively delicate to achieve, costly in labor and subject to risks of fractures at the weld, or at the unscrewing with loss of link.
  • the invention aims to remedy these drawbacks and proposes a metal scaffold ladder including the characteristics of the claim 1.
  • the step is rigidly fixed at amount, being stuck from the inside to the amount by the connection of its section oval to the body section, stuck in the hole of the amount and tightened integrally with the amount by the external crimping whose crimped edge is supported on the outer wall of the amount.
  • the ends of the rungs are deformed in an oblong section, rounded at the ends, and whose portion length is parallel to the axis of the uprights, so do not weaken the transverse rigidity of the latter.
  • the scale according to the invention as represented in FIG. conventionally comprises two lateral uprights 1 of section circular and transverse rungs 3 attached to the uprights and also of circular section.
  • Amounts 1 and 3 are tubular sections and may be of steel, aluminum or alloy aluminum.
  • the steps 3 are each fixed to the two uprights 1 by their opposite ends. These ends are ovalized (Figure 2) by deformation of the tube in press according to a section in regular oblong 5 to two dishes connected by a circular surface at the ends.
  • the length of the oblong section is substantially equal to the diameter of the amount, to the width of the outer crimping flange 7 near. of the 9 additional oblong drilling holes are formed in the uprights 1, arranged regularly in height on each of them for height fixing of rungs 3.
  • connection 11 of the oblong section 5 of the end step to the circular section 13 of the tubular body of the step is made on a short distance, about 1 to 3 cm according to the flattened of the oblong, so that when fitting the end of the step in the corresponding hole 9 of the amount, this connection relies firmly on the thickness of the post inside, crimping the outer end on the upright.
  • step 3 being blocked by its oval connection 11 on the upright 1 and rigidly tightened on the opposite side by its rim of external crimping 7, it is then rigidly attached to the amount.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

The scaffolding ladder has rounded section tubular rungs (13) and uprights (1). The ends (11) of the rungs (3) are oval over a length slightly greater than the width of the uprights. They are each fitted into a complementary drilled hole in each of the uprights and crimped (7) on the outside of the upright.

Description

L'invention concerne une échelle d'échafaudage métallique à échelons sertis sur les montantstelle que décrite dans la partie préambule de la revendication 1.The invention relates to a metal scaffolding ladder rungs crimped on the uprights as described in part preamble of claim 1.

Une échelle comportant ces caractéristiques est connue par l'enseignement des documents FR 1 564 015 et FR 2 576 965 de l'état de la technique proche. Néanmoins, la liaison de l'échelon au montant est sujette à un jeu à l'usage, préjudiciable à la sécurité des personnes. Il en est de même de la liaison selon FR 2 576 965 obtenu plus spécialement par des plis de l'échelon en prise sur le bord du trou de montant.A scale with these characteristics is known by teaching documents FR 1 564 015 and FR 2 576 965 of the state of the near technique. Nevertheless, the link between the step and the amount is subject to a game for use, detrimental to the safety of people. It is the same for the connection according to FR 2 576 965 obtained more specially by folds of the echelon engaged on the edge of the hole of amount.

En outre, les échelles d'échafaudage comportent pour la plupart, des montants et des échelons de section circulaire, les échelons étant soudés directement sur les montants ou fixés à ceux-ci au moyen de vis. Ces fixations des échelons aux montants sont relativement délicates à réaliser, coûteuses en main-d'oeuvre et sujettes à des risques de fractures au niveau de la soudure, ou au dévissage avec perte de la liaison.In addition, scaffolding ladders have, for the most part, amounts and steps of circular section, the steps being welded directly to the uprights or attached to them by means of screw. These bindings of the steps to the amounts are relatively delicate to achieve, costly in labor and subject to risks of fractures at the weld, or at the unscrewing with loss of link.

L'invention vise à remédier à ces inconvénients et propose une échelle d'échafaudage métallique comprenant les caractéristiques de la revendication 1.The invention aims to remedy these drawbacks and proposes a metal scaffold ladder including the characteristics of the claim 1.

Il résulte de cette disposition que l'échelon est rigidement fixé au montant, étant coincé par l'intérieur au montant par le raccordement de sa section ovalisée à la section de corps, bloqué dans le trou du montant et serré solidairement au montant par le sertissage externe dont le rebord serti est en appui sur la paroi externe du montant.It follows from this provision that the step is rigidly fixed at amount, being stuck from the inside to the amount by the connection of its section oval to the body section, stuck in the hole of the amount and tightened integrally with the amount by the external crimping whose crimped edge is supported on the outer wall of the amount.

L'ovalisation de l'extrémité des échelons empêche notamment que ceux-ci ne tournent dans les montants.The ovalization of the end of the rungs prevents in particular that these do not turn in the amounts.

De façon avantageuse, les extrémités des échelons sont déformées selon une section oblongue, arrondie aux extrémités, et dont la portion de longueur est parallèle à l'axe des montants, en sorte de ne pas affaiblir la rigidité transversale de ces derniers.Advantageously, the ends of the rungs are deformed in an oblong section, rounded at the ends, and whose portion length is parallel to the axis of the uprights, so do not weaken the transverse rigidity of the latter.

L'invention est illustrée ci-après à l'aide d'un exemple de réalisation et en référence au dessin annexé, sur lequel :

  • la figure 1 est une vue partielle en perspective d'une échelle pour échafaudage selon l'invention, et
  • la figure 2 est une vue agrandie montrant la fixation d'un échelon à un montant d'échelle pour échafaudage selon l'invention.
The invention is illustrated below with the aid of an exemplary embodiment and with reference to the appended drawing, in which:
  • FIG. 1 is a partial perspective view of a ladder for scaffolding according to the invention, and
  • Figure 2 is an enlarged view showing the attachment of a step to a scaffold ladder amount according to the invention.

L'échelle selon l'invention, telle que représentée en figure 1, comporte de façon classique deux montants latéraux 1 de section circulaire et des échelons transversaux 3 fixés aux montants et également de section circulaire. Les montants 1 et échelons 3 sont des profilés tubulaires et peuvent être en acier, en aluminium ou en alliage d'aluminium.The scale according to the invention, as represented in FIG. conventionally comprises two lateral uprights 1 of section circular and transverse rungs 3 attached to the uprights and also of circular section. Amounts 1 and 3 are tubular sections and may be of steel, aluminum or alloy aluminum.

Les échelons 3 sont fixés chacun aux deux montants 1 par leurs extrémités opposées. Ces extrémités sont ovalisées (figure 2) par déformation du tube sous presse selon une section en oblong régulière 5 à deux plats reliés par une surface circulaire aux extrémités. La longueur de la section oblongue est sensiblement égale au diamètre du montant, à la largeur du rebord de sertissage extérieur 7 près. Des trous de perçage en oblong 9 complémentaires sont formés dans les montants 1, disposés de façon régulière en hauteur sur chacun d'eux pour la fixation en hauteur des échelons 3.The steps 3 are each fixed to the two uprights 1 by their opposite ends. These ends are ovalized (Figure 2) by deformation of the tube in press according to a section in regular oblong 5 to two dishes connected by a circular surface at the ends. The length of the oblong section is substantially equal to the diameter of the amount, to the width of the outer crimping flange 7 near. of the 9 additional oblong drilling holes are formed in the uprights 1, arranged regularly in height on each of them for height fixing of rungs 3.

Le raccordement 11 de la section en oblong 5 de l'extrémité d'échelon à la section circulaire 13 du corps tubulaire de l'échelon est réalisé sur une faible distance, 1 à 3 cm environ selon l'aplati de l'oblong, en sorte que lors de l'emmanchement de l'extrémité de l'échelon dans le trou 9 correspondant du montant, ce raccordement s'appuie fermement en coincement sur l'épaisseur du montant, côté intérieur, au sertissage de l'extrémité extérieure sur le montant.The connection 11 of the oblong section 5 of the end step to the circular section 13 of the tubular body of the step is made on a short distance, about 1 to 3 cm according to the flattened of the oblong, so that when fitting the end of the step in the corresponding hole 9 of the amount, this connection relies firmly on the thickness of the post inside, crimping the outer end on the upright.

En effet, au sertissage on tire sur cette extrémité de l'échelon et vers l'extérieur de façon à former le rebord de sertissage oblong 7 s'appliquant serré sur le montant 1 et ainsi en tirant le raccordement vers le montant on le coince dans le trou 9. Le coincement de ce raccordement dans le trou 9 élimine tout jeu dans la liaison et il est intéressant de prévoir la meilleure pente de déformation du raccordement pour assurer un bon coincement et éviter la formation de tout jeu ultérieur. A la limite, un simple épaulement conviendrait, mais on perdrait en capacité d'éviter le jeu ultérieur.Indeed, at crimping we pull on this end of the rung and outward to form the oblong crimping rim 7 applying tight on the amount 1 and so pulling the connection to the amount we stuck it in the hole 9. The jamming of that connection in hole 9 eliminates any play in the bond and it is interesting to predict the best deformation slope of the connection to ensure a good jamming and avoid the formation of any subsequent game. At the limit, a simple shoulder would be appropriate, but we would lose the ability to avoid the subsequent game.

Dès lors, l'échelon 3 étant bloqué par son raccordement ovalisé 11 sur le montant 1 et rigidement serré du côté opposé par son rebord de sertissage externe 7, il est alors rigidement fixé au montant.Therefore, step 3 being blocked by its oval connection 11 on the upright 1 and rigidly tightened on the opposite side by its rim of external crimping 7, it is then rigidly attached to the amount.

La même fixation est réalisée pour chacun des échelons sur les montants.The same fixation is carried out for each of the steps on the amounts.

Toutes ces opérations d'ovalisation, d'emmanchement et sertissage des échelons sur les montants sont effectués rapidement sous presse. All these operations of ovalization, fitting and crimping steps on the amounts are made quickly in press.

Naturellement, et à titre de variante, ce principe de fixation des échelons, pourrait être obtenu sur des montants et/ou échelons d'une autre section que circulaire et par exemple, en ellipse.Naturally, and as an alternative, this principle of fixation of steps, could be obtained on amounts and / or steps of a other section than circular and for example, in ellipse.

Claims (7)

  1. A metal scaffolding ladder with tubular rungs and uprights of rounded section, comprising rungs (3) with out-of-round ends along a length slightly greater than the width of the section of the uprights (1), and each fixed in a complementary drilled hole formed in each of the uprights (1) at the required height, characterised in that said rung (3) ends are crimped from the outside on the upright (1), the out-of-round connection (11) of the end of the rung being pulled into the hole (9) so as to be wedged therein, for the fastening of the rung on the upright, so as to prevent the formation of subsequent play in the connection of the rung to the upright.
  2. A scaffolding ladder according to claim 1, characterised in that said ends of the rungs (3) have an oblong section (5).
  3. A scaffolding ladder according to claim 2, characterised in that said oblong section (5) is rounded at the ends.
  4. A scaffolding ladder according to claim 2 or claim 3, characterised in that the lengthwise portion of the oblong section (5) of the rung end is parallel to the uprights (1).
  5. A scaffolding ladder according to any one of claims 2 to 4, characterised in that the connection (11) of the oblong section (5) of the rung end to the section (13) of the rung body is effected at a small distance, approximately 1 to 3 cm depending on the flatness of the oblong, so that during the fixing of the end of the rung (3) in the corresponding hole (9) of the upright said connection (11) is firmly wedged on to the thickness of the upright (1) on the inner side for the crimping of the outer end on the upright (1).
  6. A scaffolding ladder according to any one of the preceding claims, characterised in that the uprights (1) and/or the rungs (3) have an elliptical section.
  7. A scaffolding ladder according to any one of claims 1 to 4 and 6, characterised in that the connection (11) is a simple shoulder.
EP00401613A 1999-06-16 2000-06-08 Metal ladder for scaffolding with crimped connection between rungs and stile Expired - Lifetime EP1061230B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9907616 1999-06-16
FR9907616A FR2795127B1 (en) 1999-06-16 1999-06-16 METALLIC SCAFFOLDING LADDER WITH STEPS CRIMPED ON THE UPRIGHTS

Publications (2)

Publication Number Publication Date
EP1061230A1 EP1061230A1 (en) 2000-12-20
EP1061230B1 true EP1061230B1 (en) 2005-08-17

Family

ID=9546868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401613A Expired - Lifetime EP1061230B1 (en) 1999-06-16 2000-06-08 Metal ladder for scaffolding with crimped connection between rungs and stile

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EP (1) EP1061230B1 (en)
AT (1) ATE302328T1 (en)
DE (1) DE60021957T2 (en)
ES (1) ES2246218T3 (en)
FR (1) FR2795127B1 (en)
PT (1) PT1061230E (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102373878A (en) * 2010-08-27 2012-03-14 新疆金成美工贸有限公司 Steel pipe-cutting and riveting straight ladder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2890682B1 (en) * 2005-09-13 2009-02-20 Centaure Sa METAL SCALE AND METHOD OF MANUFACTURING SUCH SCALE

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1422654A (en) * 1921-05-20 1922-07-11 American Pulley Co Ladder and process of manufacturing the same
GB442729A (en) * 1931-11-05 1936-02-13 Anders Wikstrand Improvements in ladders
GB667843A (en) * 1950-03-31 1952-03-05 W A Lloyd S Cycles Ltd Improvements relating to ladders
CH324149A (en) * 1953-10-05 1957-09-15 Fougerolles Andre Marie Rene E Metal ladder
FR1163204A (en) * 1956-12-06 1958-09-23 metal ladder and method for manufacturing such a ladder
FR1207288A (en) * 1958-11-06 1960-02-16 metal ladder
FR1564015A (en) * 1968-03-04 1969-04-18
US3861499A (en) * 1972-05-16 1975-01-21 Jr John O Follett Folding ladder
AU3100977A (en) * 1977-11-28 1979-06-07 Dixon N B Ladder rung
NL8600203A (en) * 1985-02-02 1986-09-01 Dieterle Philipp LADDER.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102373878A (en) * 2010-08-27 2012-03-14 新疆金成美工贸有限公司 Steel pipe-cutting and riveting straight ladder

Also Published As

Publication number Publication date
FR2795127B1 (en) 2001-09-14
FR2795127A1 (en) 2000-12-22
EP1061230A1 (en) 2000-12-20
PT1061230E (en) 2005-10-31
ES2246218T3 (en) 2006-02-16
DE60021957T2 (en) 2006-02-09
ATE302328T1 (en) 2005-09-15
DE60021957D1 (en) 2005-09-22

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