EP0357525B1 - Metal step-ladder - Google Patents

Metal step-ladder Download PDF

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Publication number
EP0357525B1
EP0357525B1 EP89420310A EP89420310A EP0357525B1 EP 0357525 B1 EP0357525 B1 EP 0357525B1 EP 89420310 A EP89420310 A EP 89420310A EP 89420310 A EP89420310 A EP 89420310A EP 0357525 B1 EP0357525 B1 EP 0357525B1
Authority
EP
European Patent Office
Prior art keywords
upright
notch
tread
question
flanges
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
EP89420310A
Other languages
German (de)
French (fr)
Other versions
EP0357525A1 (en
Inventor
Denis Ducros
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.)
Individual
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
Priority to AT89420310T priority Critical patent/ATE77128T1/en
Publication of EP0357525A1 publication Critical patent/EP0357525A1/en
Application granted granted Critical
Publication of EP0357525B1 publication Critical patent/EP0357525B1/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
    • E06C7/084—Rungs comprising projecting tabs or flanges

Definitions

  • the present invention relates to a metal stepladder but, here, the term stepladder should not be interpreted in a restrictive manner because the invention also applies to running boards, miller's ladders and any similar device making it possible to go up and down without having to use your hands to keep your balance.
  • the metal stepladder covered by the present invention is of the type in which the uprights supporting the steps are constituted by metal tubular profiles of any cross section and in which the steps are made from an extruded aluminum profile or the like. or in sheet metal folded approximately to the profile of an inverted U, the core of which has, at each end, a notch capable of being engaged on the corresponding upright and the free edges of the wings, parallel to each other, having, with respect to to their core, the same inclination as the uprights relative to the horizontal when the stepladder is in the position of use and are at a distance from each other equal to the width of the aforementioned notch so as to be able to be applied to the front and rear faces of the upright on which this notch is engaged, means being provided for mechanically linking the extrusions to the uprights emitted from the edges of the wings applied against them.
  • each edge of a step wing is fixed to the adjacent wall of the upright by a blind rivet so that each step is fixed to the two uprights by four rivets whose installation requires four drilling and riveting operations.
  • this method of attachment does absolutely nothing to strengthen or improve the rigidity of the assembly.
  • the present invention aims to simplify the fixing of the steps to the uprights while improving the rigidity of the mounting and the mechanical strength of the uprights of the stepladder.
  • the means for fixing each step end to the corresponding upright are constituted by a single connecting member passing right through the two ends of the edges of the wings of the step considered and the two opposite wall portions of the upright and making an angle with the axis of the upright considered different from 90 °.
  • each step end requires only a single drilling operation and only one installation of a connecting member.
  • the latter is a member working in traction, such as a bolt or a rivet, which creates, in each upright and at each step, a transverse compression stress which increases both the rigidity of the assemblies and those of the uprights.
  • the invention relates to a stepladder of the type comprising two tubular uprights 2, articulated with two support legs 3 and supporting steps 4.
  • the tubular uprights 2 are of rectangular cross section and the steps 4 have a cross section substantially in inverted U whose free edges of the wings 4a and 4b, parallel to each other, have, with respect to their core 4c, an inclination of angle A equal to the inclination of the uprights 2 relative to the horizontal and are at a distance from each other D equal to the distance separating the external faces of the front walls 2a and rear 2b of the corresponding amount 2.
  • the core 4c of each step 4 has a notch 5 whose width and length correspond substantially to the cross section of the uprights 2 of the stepladder so as to allow it to be engaged on this amount.
  • the steps 4 are made of folded sheet metal but they could just as easily be cut from an aluminum profile or other similar extruded.
  • each end of a step 4 is fixed by a single connecting member 6 passing right through the edge of the wing 4a, the front wall 2a, the rear wall 2b and the other wing 4b.
  • each step 4 to the two uprights 2 of the step ladder requires only two holes, one for each end of the step 4, and the installation of only two connecting members 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Inorganic Insulating Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Steps, Ramps, And Handrails (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

This step-ladder is of the type in which the uprights (2) supporting the treads (4) consist of tubular profiles with any transverse section and in which the treads (4) are made from a profile in aluminium or another similar material, extruded or as a metal sheet folded approximately into the shape of an inverted U whose web (4c) has, at each end, a notch (5) capable of being engaged on the corresponding upright (2) and whose free edges of the flanges (4a,4b) are parallel to one another, have, relative to their web (4c), the same slope (A) as the uprights (2) relative to the horizontal when the step-ladder is in a position of use, and are at a distance from one another which is equal to that of the notch or to that separating the outer faces of the front (2a) and rear (2b) walls of the upright (2) in question so as to be able to be applied on the abovementioned faces of the upright (2) on which the notch (5) is engaged, means being provided for mechanically connecting the ends of the free edges of the flanges (4a, 4b) applied against them to the upright (2). The means for fastening each end of a tread (4) to the corresponding upright (2) consist of a single connection member (6) passing right through the two ends of the free edges of the flanges (4a, 4b) of the tread (4) in question and the two opposite wall portions (2a, 2b) of this upright (2). <IMAGE>

Description

La présente invention concerne un escabeau métallique mais, ici, le terme escabeau ne doit pas être interprété de façon limitative car l'invention s'applique aussi aux marchepieds, échelles de meunier et à tout appareil similaire permettant de monter et de descendre sans avoir à s'aider des mains pour conserver son équilibre.The present invention relates to a metal stepladder but, here, the term stepladder should not be interpreted in a restrictive manner because the invention also applies to running boards, miller's ladders and any similar device making it possible to go up and down without having to use your hands to keep your balance.

L'escabeau métallique visé par la présente invention est du type dans lequel les montants supportant les marches 'sont constitués par des profilés tubulaires métalliques de section transversale quelconque et dans lequel les marches sont réalisées à partir d'un profilé en aluminium ou autre similaire extrudé ou en tôle métallique pliée approximativement au profil d'un U renversé, dont l'âme présente, à chaque extrémité, une encoche apte à être engagée sur le montant correspondant et dont les bords libres des ailes, parallèles entre eux, présentent, par rapport à leur âme, la même inclinaison que les montants par rapport à l'horizontale lorsque l'escabeau est en position d'utilisation et sont à une distance l'un de l'autre égale à la largeur de l'encoche précitée de manière à pouvoir être appliqués sur les faces avant et arrière du montant sur lequel est engagée cette encoche, des moyens étant prévus pour lier mécaniquement aux montants les extrémités des bords des ailes appliquées contre eux.The metal stepladder covered by the present invention is of the type in which the uprights supporting the steps are constituted by metal tubular profiles of any cross section and in which the steps are made from an extruded aluminum profile or the like. or in sheet metal folded approximately to the profile of an inverted U, the core of which has, at each end, a notch capable of being engaged on the corresponding upright and the free edges of the wings, parallel to each other, having, with respect to to their core, the same inclination as the uprights relative to the horizontal when the stepladder is in the position of use and are at a distance from each other equal to the width of the aforementioned notch so as to be able to be applied to the front and rear faces of the upright on which this notch is engaged, means being provided for mechanically linking the extrusions to the uprights emitted from the edges of the wings applied against them.

Dans les escabeaux actuels (FR-A- 2098112), chaque bord d'une aile de marche est fixée à la paroi adjacente du montant par un rivet aveugle de sorte que chaque marche est fixée aux deux montants par quatre rivets dont la pose nécessite quatre opérations de perçage et rivetage. En outre, ce mode de fixation ne contribue absolument pas à renforcer ou améliorer la rigidité de l'ensemble.In current stepladders (FR-A- 2098112), each edge of a step wing is fixed to the adjacent wall of the upright by a blind rivet so that each step is fixed to the two uprights by four rivets whose installation requires four drilling and riveting operations. In addition, this method of attachment does absolutely nothing to strengthen or improve the rigidity of the assembly.

La présente invention vise à simplifier la fixation des marches aux montants tout en améliorant la rigidité du montage et la résistance mécanique des montants de l'escabeau. A cet effet, dans l'escabeau qu'elle concerne et qui est du type précité, les moyens de fixation de chaque extrémité de marche au montant correspondant sont constitués par un organe de liaison unique traversant de part en part les deux extrémités des bords des ailes de la marche considérée et les deux parties de parois opposées du montant et faisant avec l'axe du montant considéré un angle différent de 90°.The present invention aims to simplify the fixing of the steps to the uprights while improving the rigidity of the mounting and the mechanical strength of the uprights of the stepladder. To this end, in the stepladder which it concerns and which is of the aforementioned type, the means for fixing each step end to the corresponding upright are constituted by a single connecting member passing right through the two ends of the edges of the wings of the step considered and the two opposite wall portions of the upright and making an angle with the axis of the upright considered different from 90 °.

Ainsi, la fixation de chaque extrémité de marche ne nécessite qu'une seule opération de perçage et qu'une seule mise en place d'un organe de liaison.Thus, the fixing of each step end requires only a single drilling operation and only one installation of a connecting member.

Selon l'invention, ce dernier est un organe travaillant à la traction, tel qu'un boulon ou un rivet, ce qui permet de créer, dans chaque montant et au niveau de chaque marche, une contrainte de compression transversale qui augmente à la fois la rigidité des assemblages et celles des montants.According to the invention, the latter is a member working in traction, such as a bolt or a rivet, which creates, in each upright and at each step, a transverse compression stress which increases both the rigidity of the assemblies and those of the uprights.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de cet escabeau :

  • Figure 1 en est une vue en perspective ;
  • Figure 2 est, a échelle agrandie, une vue partielle en coupe axiale d'un montant montrant l'assemblage de l'extrémité correspondante d'une marche à ce montant.
In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the appended schematic drawing representing, by way of nonlimiting example, an embodiment of this stepladder:
  • Figure 1 is a perspective view;
  • Figure 2 is, on an enlarged scale, a partial view in axial section of an amount showing the assembly of the corresponding end of a step to this amount.

Comme le montre la figure 1, l'invention concerne un escabeau du type comportant deux montants tubulaires 2, articulés à deux jambes d'appui 3 et supportant des marches 4.As shown in FIG. 1, the invention relates to a stepladder of the type comprising two tubular uprights 2, articulated with two support legs 3 and supporting steps 4.

Dans l'exemple illustré sur le dessin, les montants tubulaires 2 sont de section transversale rectangulaires et les marches 4 présentent une section transversale sensiblement en U renversé dont les bords libres des ailes 4a et 4b, parallèles entre eux, présentent, par rapport à leur âme 4c, une inclinaison d'angle A égale à l'inclinaison des montants 2 par rapport à l'horizontale et sont à une distance l'un de l'autre D égale à la distance séparant les faces externes des parois avant 2a et arrière 2b du montant 2 correspondant. En outre, à chacune de ses extrémités, l'âme 4c de chaque marche 4 présente une encoche 5 dont la largeur et la longueur correspondent sensiblement à la section transversale des montants 2 de l'escabeau de manière à lui permettre d'être engagée sur ce montant. Dans l'exemple illustré sur le dessin, les marches 4 sont réalisées en tôle pliée mais elles pourraient tout aussi bien être découpées dans un profilé en aluminium ou autre similaire extrudé.In the example illustrated in the drawing, the tubular uprights 2 are of rectangular cross section and the steps 4 have a cross section substantially in inverted U whose free edges of the wings 4a and 4b, parallel to each other, have, with respect to their core 4c, an inclination of angle A equal to the inclination of the uprights 2 relative to the horizontal and are at a distance from each other D equal to the distance separating the external faces of the front walls 2a and rear 2b of the corresponding amount 2. In addition, at each of its ends, the core 4c of each step 4 has a notch 5 whose width and length correspond substantially to the cross section of the uprights 2 of the stepladder so as to allow it to be engaged on this amount. In the example illustrated in the drawing, the steps 4 are made of folded sheet metal but they could just as easily be cut from an aluminum profile or other similar extruded.

Ainsi, lors de la mise en place de chaque marche 4 par engagement de ses encoches 5 sur les montants 2, les bords libres de ses branches 4a, 4b se trouvent en contact intime avec les faces externes des parois avant 2a et arrière 2b du montant 2 considéré.Thus, when each step 4 is put in place by engaging its notches 5 on the uprights 2, the free edges of its branches 4a, 4b are in intimate contact with the external faces of the front 2a and rear 2b walls of the upright. 2 considered.

Selon l'invention, au lieu de fixer chaque extrémité d'une aile 4a, 4b d'une marche 4 au montant 2 correspondant par un rivet aveugle, ce qui impliquerait, pour chaque marche 4, quatre perçages et quatre poses de rivet aveugle, chaque extrémité d'une marche 4 est fixée par un seul organe de liaison 6 traversant de part en part le bord de l'aile 4a, la paroi avant 2a, la paroi arrière 2b et l'autre aile 4b.According to the invention, instead of fixing each end of a wing 4a, 4b of a step 4 to the corresponding upright 2 by a blind rivet, which would imply, for each step 4, four holes and four poses of blind rivet, each end of a step 4 is fixed by a single connecting member 6 passing right through the edge of the wing 4a, the front wall 2a, the rear wall 2b and the other wing 4b.

Ainsi, la fixation de chaque marche 4 aux deux montants 2 de l'escabeau ne nécessite que deux perçages, un pour chaque extrémité de la marche 4, et la mise en place de seulement deux organes de liaison 6.Thus, the fixing of each step 4 to the two uprights 2 of the step ladder requires only two holes, one for each end of the step 4, and the installation of only two connecting members 6.

Naturellement, l'exemple qui vient d'être décrit concerne un escabeau mais l'invention s'applique tout aussi bien aux marchepieds, échelles de meunier et autres similaires.Naturally, the example which has just been described relates to a stepladder but the invention applies equally well to running boards, sucker ladders and the like.

Claims (3)

1. Metal stepladder of the type in which the uprights (2) supporting the treads (4) are formed by tubular extrusions of any cross section and in which the treads (4) are produced from a section made from extruded aluminium or similar or from folded sheet metal approximately in the shape of an inverted U, on which the web (4c) has, at each end, a notch (5) suitable for being engaged on the corresponding upright (2) and on which the free edges of the flanges (4a, 4b), parallel to each other, have, with respect to their web (4c), the same inclination (A) as the uprights (2) with respect to the horizontal when the stepladder is in its position of use and are at a distance from each other equal to that of the edges of the notch or the one separating the external faces of the front (2a) and rear (2b) walls of the upright (2) in question so as to be able to be pressed against the aforesaid faces of the upright (2) on which the notch (5) is engaged, means being provided to connect mechanically to the upright (2) the ends of the free edges of the flanges (4a, 4b) pressed against them, characterised in that the means of fixing each end of a tread (4) to the corresponding upright (2) consist of a single connecting device (6) passing right through the two ends of the free edges of the flanges (4a, 4b) of the tread (4) in question and the two opposite parts of the walls (2a, 2b) of this upright (2) and making, with the axis of the upright (2) in question, an angle different from 90° and in that the connecting device (6) used for fixing each end of a tread (4) to the corresponding upright (2) is a device operating under traction, making it possible to create, in each upright (2) and at the level of each tread (4), a compressive stress tending to bring the front (2a) and rear (2b) parts of the walls of the upright (2) in question closer together.
2. Metal stepladder according to claim 1, characterised in that the connecting device (6) consists of a rivet.
3. Metal stepladder according to claim 1, characterised in that the connecting device (6) is a bolt.
EP89420310A 1988-08-25 1989-08-22 Metal step-ladder Expired - Lifetime EP0357525B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89420310T ATE77128T1 (en) 1988-08-25 1989-08-22 METAL STEPLADDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8811419A FR2635816B1 (en) 1988-08-25 1988-08-25 METAL STEP
FR8811419 1988-08-25

Publications (2)

Publication Number Publication Date
EP0357525A1 EP0357525A1 (en) 1990-03-07
EP0357525B1 true EP0357525B1 (en) 1992-06-10

Family

ID=9369629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420310A Expired - Lifetime EP0357525B1 (en) 1988-08-25 1989-08-22 Metal step-ladder

Country Status (5)

Country Link
EP (1) EP0357525B1 (en)
AT (1) ATE77128T1 (en)
DE (1) DE68901754T2 (en)
ES (1) ES2032674T3 (en)
FR (1) FR2635816B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102359345A (en) * 2011-07-29 2012-02-22 苏州展华纺织有限公司 Novel herringbone ladder
CN107217979A (en) * 2017-07-29 2017-09-29 葛滨 A kind of maintenance ladder for domestic circuit
RU192759U1 (en) * 2018-06-01 2019-09-30 Догрулар Дыш Тиджарет Аноним Ширкети HIGH STRENGTH STAIRS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618427A (en) * 1947-03-27 1952-11-18 Hudmon S Langley Ladder
DE7025208U (en) * 1970-07-04 1970-11-05 Ruschitzka Friedrich LADDER, IN PARTICULAR FOR HOUSEHOLD PURPOSES.
US3908795A (en) * 1973-08-15 1975-09-30 Vinyl Fab Ind Safety ladder for above-the-ground swimming pools

Also Published As

Publication number Publication date
FR2635816A1 (en) 1990-03-02
DE68901754T2 (en) 1993-01-14
EP0357525A1 (en) 1990-03-07
DE68901754D1 (en) 1992-07-16
ATE77128T1 (en) 1992-06-15
FR2635816B1 (en) 1994-01-07
ES2032674T3 (en) 1993-02-16

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