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EP0065492A2 - Foldable stepladder - Google Patents

Foldable stepladder Download PDF

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Publication number
EP0065492A2
EP0065492A2 EP82830081A EP82830081A EP0065492A2 EP 0065492 A2 EP0065492 A2 EP 0065492A2 EP 82830081 A EP82830081 A EP 82830081A EP 82830081 A EP82830081 A EP 82830081A EP 0065492 A2 EP0065492 A2 EP 0065492A2
Authority
EP
European Patent Office
Prior art keywords
steps
uprights
platform
frames
frame
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.)
Withdrawn
Application number
EP82830081A
Other languages
German (de)
French (fr)
Other versions
EP0065492A3 (en
Inventor
Antonio Rapisarda
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
Publication of EP0065492A2 publication Critical patent/EP0065492A2/en
Publication of EP0065492A3 publication Critical patent/EP0065492A3/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms
    • E06C1/393—Ladders having platforms foldable with the ladder
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/387—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders having tip-up steps

Definitions

  • the invention relates to a folding stepladder which comprises a front frame and a rear frame, the movements of spacing and reconciliation rotate a series of steps and an upper platform between a horizontal position and a retracted position.
  • a folding stool of this kind is already known which corresponds to the preamble of claim 1.
  • anterior In the following description and in the claims, the terms "anterior”, “posterior” and the like must be interpreted as referring to the positions of the two frames of the stepladder, the one of which having steps is conventionally called “anterior”, while the other frame is conventionally called “posterior”. It should also be understood that the terms “upper”, “lower”, “horizontal” and the like refer to the normal standing position of the stepladder.
  • a folding stepladder of the kind referred to is already known from document FR - A - 1 103 090.
  • the steps are pivotally mounted, by their central part, on the bars which connect the uprights of the front frame to one another.
  • a middle rod is hinged to the rear edges of the steps as well as to the upper platform.
  • This known arrangement has as a first drawback the fact that if the weight of the user is applied to the front parts of the steps, they can pivot towards the retracted position. This pivoting also causes the movement of the rod in the direction which corresponds to the bringing together of the two frames. Not only can the user then slide down the inclined steps and fall to the ground, but the entire stepladder can fold and tumble. All this can cause serious accidents.
  • stepladder Another drawback of the known stepladder is the danger in the event of a broken rod or one of its joints. In this case also, if the user steps on a step which is no longer retained in the horizontal position by the rod, this step rocks by sliding the user who in this case also may suffer a serious accident.
  • the present invention aims to provide a remedy to these drawbacks.
  • each step is supported, in its horizontal position, independently of the other steps.
  • the front part of the steps which is where the weight of the user is most often applied, is solidly supported by the bars.
  • the rear part of the steps is supported by the articulations to the uprights of the front frame and not by the rod, which according to the invention has no other function than that of allowing maneuvering in unison with the steps and the upper platform. If the rod or one of its joints breaks, this has no influence on the horizontal position of the steps resting on the bars and on their own joints.
  • the weight of the user on a step and in particular on the front part thereof can in no way produce, by means of the rod and the upper platform, the involuntary bringing together of the two frames.
  • a stepladder folding comprises an anterior frame 10 and a posterior frame 12.
  • the anterior frame 10 comprises a pair of uprights 14 interconnected by a series of equidistant horizontal bars, not visible in FIGS. 1 and 2, but which can be seen in the figures 3 to 5, where these bars are indicated by 16.
  • the series of bars also includes an upper bar 18, visible in FIG. 2.
  • the two uprights 14 are also connected to each other by an upper crosspiece 22 acting as a railing .
  • the rear frame 12 comprises a pair of uprights 20 connected to one another by a horizontal upper bar 24 and by a horizontal lower bar 26.
  • the two uprights 20 are further connected by a crosspiece 28.
  • the two uprights 14 are articulated by hinges 30 on the inner faces of the uprights 20, to allow the movement of the two frames 10 and 12 between the positions of FIGS. 1 and 2. Since the uprights 14 are located transversely inside the uprights 20, in the position of Figure 2 the front frame 10 is retracted into the rear frame 20, which frames it. Notches 32 and 34 are provided in the uprights 14 to receive the corresponding bars 24 and 26 in order to allow total retraction.
  • the front frame 10 is provided with a series of steps in the form of boards.
  • the top step or platform is indicated by 38, while the remaining steps are indicated by 40.
  • the steps 38, 40 are equidistant.
  • Walking upper 38 has a depth or tread greater than that of the steps 40 and constitutes a work platform for the user located at the top of the stepladder.
  • the upper platform 38 is articulated, by its front part, on the upper bar 18 of the front frame.
  • a middle part of the platform 38 is connected, by a double central connecting rod 42, to the upper bar 24 of the rear frame 12.
  • the arrangement is such that when the two frames 10, 12 are folded as in Figures 3 and 4, the upper platform 38 is folded up relative to its axis of articulation materialized by the bar 24.
  • the movement of spacing of the frames 10, 12 from the position of FIGS. 2 and 3 to that of FIGS. 1 and 5 produces, by means of the central rod 42, the folding back of the upper platform 38, from its storage position in FIGS. 2 and 3 up to the position of use of FIGS. 1 to 5.
  • the direction of this rearward folding is indicated by the arrow A in FIG. 4.
  • the upper platform 38 In its position of use, the upper platform 38 is supported horizontally on the upper bar 24 of the rear frame 12 and the articulation 44 of the central rod 42 to the platform 38 is substantially coplanar with the upper bars 18 and 24 of the two frames. This latter arrangement prevents the two frames from spreading beyond the position of use in FIGS. 1 and 5.
  • the upper platform 38 is further provided with a pair of yokes 46. In the position of the figures 1 and 5, the upper bar 24 of the rear frame 12 is engaged in these yokes 46 to constitute a guarantee against the spacing of the frames beyond the position of use.
  • Each of the steps 40 is articulated to the two uprights 14 of the front frame 10 around a respective horizontal axis, materialized by hinges 48. These hinges 48 are located towards the rear relative to the corresponding bars 16. In this way, the steps 40 can switch between a storage position ( Figures 2 and 3), in which they are folded upwards relative to their axis of articulation 48 and are retracted between the uprights 14, and a position d 'use ( Figures 1 and 5), wherein the steps 40 are supported on the bars 16 corresponding.
  • a rod 50 in the form of a flattened strip, which is interposed between the lateral edge of the steps 40 and the upright 14.
  • the rod 50 is articulated at each step by means of hinges. These hinges are indicated by 52, except that of the penultimate upper step, is indicated by 60.
  • the hinges 52, 60 define articulation axes located at the front relative to the axes or hinges 48.
  • the rod 50 constitutes a coupling member which serves to obtain the tilting in unison steps 40 between their two storage and use positions.
  • Notches 54 are provided in the posted edge laughing rod 50 to prevent it from interfering with the hinges 48, and other notches 56 are formed in the front edge of the rod to prevent it from interfering with bars 16.
  • a helical tension spring 58 hooked to the upright 14 and tending to return the rod downwards, that is to say to recall the steps 40 at the position of use of Figures 1 and 5.
  • the upper end of the coupling rod 50 is articulated at 60 at one end of a lateral connecting rod 62.
  • the other end of the connecting rod is articulated at 64 at the rear part of the upper platform 38.
  • connection systems described above, between the steps 38, 40 on the one hand, and between the step 38 and the two frames 10 and 12, on the other hand, in order to obtain the movement of the steps between their two positions the user must do nothing other than move aside or bring the two frames 10 and 12 closer together.

Landscapes

  • Ladders (AREA)

Abstract

The step ladder has a front (10) and a rear frame (12) each having a pair of risers (14,20), the frames being articulated between them at the top of the risers to allow them to open and close. A platform (38) is connected to one of the frames. Risers (14) of front frame (10) are connected by a series of bars (16) and between these risers are a series of pivoting steps (40) each of which is situated at the height of a bar (16). Rod (50) is connected to the steps and the platform so that when the frames (10,12) move from the open to closed position, steps and platform fold in unison.

Description

L'invention concerne un escabeau pliant qui comprend un cadre antérieur et un cadre postérieur dont les mouvements d'écartement et de rapprochement font pivoter une série de marches et une plate-forme supérieure entre une position horizontale et une position escamotée.The invention relates to a folding stepladder which comprises a front frame and a rear frame, the movements of spacing and reconciliation rotate a series of steps and an upper platform between a horizontal position and a retracted position.

On connaît déjà un escabeau pliant de ce genre qui correspond au préambule de la revendication 1.A folding stool of this kind is already known which corresponds to the preamble of claim 1.

Dans la description qui suit et dans les revendications les termes "antérieur", "postérieur" et équivalents doivent être interprétés comme se référant aux positions des deux cadres de l'escabeau, dont celui qui est pourvu de marches est dénommé conventionnellement "antérieur", tandis que l'autre cadre est dénommé conventionnellement "postérieur". Il doit être entendu également que les termes "supérieur", "inférieur", "horizontal" et analogues se réfèrent à la position debout normale de l'escabeau.In the following description and in the claims, the terms "anterior", "posterior" and the like must be interpreted as referring to the positions of the two frames of the stepladder, the one of which having steps is conventionally called "anterior", while the other frame is conventionally called "posterior". It should also be understood that the terms "upper", "lower", "horizontal" and the like refer to the normal standing position of the stepladder.

Un escabeau pliant du genre visé est déjà connu par le document FR - A - 1 103 090. Dans cet escabeau connu les marches sont montées pivotantes, par leur partie centrale, sur les barreaux qui relient entre eux les montants du cadre antérieur. Une tringle médiane est articulée aux bords postérieurs des marches ainsi qu'à la plate-forme supérieure. Lorsque les marches sont disposées horizontalement, leurs parties antérieures sont en porte-à-faux par rapport aux barreaux d'articulation.A folding stepladder of the kind referred to is already known from document FR - A - 1 103 090. In this known stepladder, the steps are pivotally mounted, by their central part, on the bars which connect the uprights of the front frame to one another. A middle rod is hinged to the rear edges of the steps as well as to the upper platform. When the steps are arranged horizontally, their front parts are cantilevered with respect to the articulation bars.

Cette disposition connue a comme premier inconvénient le fait que si le poids de l'utilisateur est appliqué sur les parties antérieures des marches, celles-ci peuvent pivoter vers la position escamotée. Ce pivotement entraîne également le mouvement de la tringle dans le sens qui correspond au rapprochement des deux cadres. Non seulement l'utilisateur peut alors glisser sur les marches inclinées et tomber au sol, mais l'escabeau tout entier peut se replier et culbuter. Tout ceci peut être cause de graves accidents.This known arrangement has as a first drawback the fact that if the weight of the user is applied to the front parts of the steps, they can pivot towards the retracted position. This pivoting also causes the movement of the rod in the direction which corresponds to the bringing together of the two frames. Not only can the user then slide down the inclined steps and fall to the ground, but the entire stepladder can fold and tumble. All this can cause serious accidents.

Un autre inconvénient de l'escabeau connu est le danger en cas de rupture de la tringle ou d'une de ses articulations. Dans ce cas également, si l'utilisateur met le pied sur une marche qui n'est plus retenue dans la position horizontale par la tringle, cette marche bascule en faisant glisser l'utilisateur qui dans ce cas également peut subir un grave accident.Another drawback of the known stepladder is the danger in the event of a broken rod or one of its joints. In this case also, if the user steps on a step which is no longer retained in the horizontal position by the rod, this step rocks by sliding the user who in this case also may suffer a serious accident.

La présente invention a pour but d'apporter un remède à ces inconvénients.The present invention aims to provide a remedy to these drawbacks.

Ce but est atteint par l'invention telle qu'elle est caractérisée dans les revendications.This object is achieved by the invention as characterized in the claims.

Grâce à la solution proposée par l'invention, chaque marche est supportée, dans sa position horizontale, indépendamment des autres marches. La partie antérieure des marches, qui est celle où le plus souvent est appliqué le poids de l'utilisatuer, est supportée solidement par les barreaux. La partie postérieure des marches est supportée par les articulations aux montants du cadre antérieur et non pas par la tringle, qui selon l'invention n'a d'autre fonction que celle de permettre la manoeuvre à l'unisson des marches et de la plate-forme supérieure. Si la tringle ou l'une de ses articulations vient à rompre, ceci n'a aucune influence sur la position horizontale des marches en appui sur les barreaux et sur leurs propres articulations. En outre, le poids de l'utilisateur sur une marche et notamment sur la partie antérieure de celle-ci ne peut aucunement produire, par l'entremise de la tringle et de la plate-forme supérieure, le rapprochement involontaire des deux cadres.Thanks to the solution proposed by the invention, each step is supported, in its horizontal position, independently of the other steps. The front part of the steps, which is where the weight of the user is most often applied, is solidly supported by the bars. The rear part of the steps is supported by the articulations to the uprights of the front frame and not by the rod, which according to the invention has no other function than that of allowing maneuvering in unison with the steps and the upper platform. If the rod or one of its joints breaks, this has no influence on the horizontal position of the steps resting on the bars and on their own joints. In addition, the weight of the user on a step and in particular on the front part thereof can in no way produce, by means of the rod and the upper platform, the involuntary bringing together of the two frames.

Dans ce qui suit l'invention est exposée plus en détail à l'aide de dessins représentant seulement un mode d'exécution.

  • La figure 1 est une vue en perspective de l'escabeau dans la position déployée d'utilisation,
  • la figure 2 est une vue en perspective de ce même escabeau dans la position repliée de rangement,
  • la figure 3 est une vue en élévation latérale partielle de l'escabeau, sans les montants de droite des deux cadres (c'est-à-dire les montants situés à gauche sur les figures 1 et 2), dans laquelle l'escabeau est représenté dans la position de rangement de la figure 2,
  • la figure 4 est une vue en élévation analogue à la figure 3, qui montre l'escabeau en cours d'écartement ou de déploiement, et
  • la figure 5 est encore une vue en élévation analogue aux figures 3 et 4, qui montre l'escabeau tout entier dans la position déployée d'utilisation de la figure 1.
In what follows the invention is explained in more detail with the aid of drawings representing only one embodiment.
  • FIG. 1 is a perspective view of the stepladder in the deployed position of use,
  • FIG. 2 is a perspective view of this same stepladder in the folded storage position,
  • Figure 3 is a partial side elevational view of the stepladder, without the right uprights of the two frames (i.e. the uprights located on the left in Figures 1 and 2), in which the stepladder is shown in the storage position of FIG. 2,
  • FIG. 4 is an elevation view similar to FIG. 3, which shows the stepladder during separation or deployment, and
  • FIG. 5 is another view in elevation similar to FIGS. 3 and 4, which shows the entire stepladder in the deployed position of use of FIG. 1.

En se référant aux figures 1 et 2, un escabeau pliant comprend un cadre antérieur 10 et un cadre postérieur 12. Le cadre antérieur 10 comprend une paire de montants 14 reliés entre eux par une série de barreaux horizontaux équidistants, non visibles sur les figures 1 et 2, mais qui peuvent être observés sur les figures 3 à 5, où ces barreaux sont indiqués par 16. La série de barreaux comprend également un barreau supérieur 18, visible sur la figure 2. Les deux montants 14 sont en outre reliés entre eux par une traverse supérieure 22 faisant office de garde-fou.Referring to Figures 1 and 2, a stepladder folding comprises an anterior frame 10 and a posterior frame 12. The anterior frame 10 comprises a pair of uprights 14 interconnected by a series of equidistant horizontal bars, not visible in FIGS. 1 and 2, but which can be seen in the figures 3 to 5, where these bars are indicated by 16. The series of bars also includes an upper bar 18, visible in FIG. 2. The two uprights 14 are also connected to each other by an upper crosspiece 22 acting as a railing .

Le cadre postérieur 12 comprend une paire de montants 20 reliés entre eux par un barreau supérieur horizontal 24 et par un barreau inférieur horizontal 26. Les deux montants 20 sont en outre reliés par un croisillon 28.The rear frame 12 comprises a pair of uprights 20 connected to one another by a horizontal upper bar 24 and by a horizontal lower bar 26. The two uprights 20 are further connected by a crosspiece 28.

Les deux montants 14 sont articulés par des charnières 30 aux faces intérieures des montants 20, pour permettre le mouvement des deux cadres 10 et 12 entre les positions des figures 1 et 2. Etant donné que les montants 14 sont situés transversalement à l'intérieur des montants 20, dans la position de la figure 2 le cadre antérieur 10 est escamoté dans le cadre postérieur 20, qui l'encadre. Des encoches 32 et 34 sont ménagées dans les montants 14 pour recevoir les barreaux correspondants 24 et 26 afin de permettre un escamotage total.The two uprights 14 are articulated by hinges 30 on the inner faces of the uprights 20, to allow the movement of the two frames 10 and 12 between the positions of FIGS. 1 and 2. Since the uprights 14 are located transversely inside the uprights 20, in the position of Figure 2 the front frame 10 is retracted into the rear frame 20, which frames it. Notches 32 and 34 are provided in the uprights 14 to receive the corresponding bars 24 and 26 in order to allow total retraction.

Le cadre antérieur 10 est pourvu d'une série de marches en forme de planchettes. Dans cette série, la marche supérieure ou plate-forme est indiquée par 38, tandis que les marches restantes sont indiquées par 40. Les marches 38, 40 sont équidistantes. La marche supérieure 38 a une profondeur ou giron supérieur à celui des marches 40 et constitue une plate-forme de travail pour l'utilisateur situé en haut de l'escabeau.The front frame 10 is provided with a series of steps in the form of boards. In this series, the top step or platform is indicated by 38, while the remaining steps are indicated by 40. The steps 38, 40 are equidistant. Walking upper 38 has a depth or tread greater than that of the steps 40 and constitutes a work platform for the user located at the top of the stepladder.

La plate-forme supérieure 38 est articulée, par sa partie antérieure, sur le barreau supérieur 18 du cadre antérieur. Une partie de milieu de la plate-forme 38 est reliée, par une double bielle centrale 42, au barreau supérieur 24 du cadre postérieur 12.The upper platform 38 is articulated, by its front part, on the upper bar 18 of the front frame. A middle part of the platform 38 is connected, by a double central connecting rod 42, to the upper bar 24 of the rear frame 12.

L'agencement est tel que lorque les deux cadres 10, 12 sont repliés comme sur les figures 3 et 4, la plate-forme supérieure 38 est rabattue vers le haut par rapport à son axe d'articulation matérialisé par le barreau 24. Le mouvement d'écartement des cadres 10, 12 de la position des figures 2 et 3 à celle des figures 1 et 5 produit, par l'entremise de la bielle centrale 42, le rabattement vers l'arrière de la plate-forme supérieure 38, depuis sa position de rangement des figures 2 et 3 jusqu'à la position d'utilisation des figures 1 à 5. Le sens de ce rabattement vers l'arrière est indiqué par la flèche A sur la figure 4. Dans sa position d'utilisation, la plate-forme supérieure 38 prend appui horizontalement sur le barreau supérieur 24 du cadre postérieur 12 et l'articulation 44 de la bielle centrale 42 à la plate-forme 38 est sensiblement coplanaire aux barreaux supérieurs 18 et 24 des deux cadres. Cette dernière disposition empêche les deux cadres de s'écarter au-delà de la position d'utilisation des figures 1 et 5.The arrangement is such that when the two frames 10, 12 are folded as in Figures 3 and 4, the upper platform 38 is folded up relative to its axis of articulation materialized by the bar 24. The movement of spacing of the frames 10, 12 from the position of FIGS. 2 and 3 to that of FIGS. 1 and 5 produces, by means of the central rod 42, the folding back of the upper platform 38, from its storage position in FIGS. 2 and 3 up to the position of use of FIGS. 1 to 5. The direction of this rearward folding is indicated by the arrow A in FIG. 4. In its position of use, the upper platform 38 is supported horizontally on the upper bar 24 of the rear frame 12 and the articulation 44 of the central rod 42 to the platform 38 is substantially coplanar with the upper bars 18 and 24 of the two frames. This latter arrangement prevents the two frames from spreading beyond the position of use in FIGS. 1 and 5.

La plate-forme supérieure 38 est pourvue en outre d'une paire de chapes 46. Dans la position des figures 1 et 5, le barreau supérieur 24 du cadre postérieur 12 est engagé dans ces chapes 46 pour constituer une garantie contre l'écartement des cadres au-delà de la position d'utilisation.The upper platform 38 is further provided with a pair of yokes 46. In the position of the figures 1 and 5, the upper bar 24 of the rear frame 12 is engaged in these yokes 46 to constitute a guarantee against the spacing of the frames beyond the position of use.

Chacune des marches 40 est articulée aux deux montants 14 du cadre antérieur 10 autour d'un axe horizontal respectif, matérialisé par des charnières 48. Ces charnières 48 sont situées vers l'arrière par rapport aux barreaux 16 correspondants. De cette manière, les marches 40 peuvent basculer entre une position de rangement (figures 2 et 3), dans laquelle elles sont rabattues vers le haut par rapport à leur axe d'articulation 48 et sont escamotées entre les montants 14, et une position d'utilisation (figures 1 et 5), dans laquelle les marches 40 prennent appui sur les barreaux 16 correspondants.Each of the steps 40 is articulated to the two uprights 14 of the front frame 10 around a respective horizontal axis, materialized by hinges 48. These hinges 48 are located towards the rear relative to the corresponding bars 16. In this way, the steps 40 can switch between a storage position (Figures 2 and 3), in which they are folded upwards relative to their axis of articulation 48 and are retracted between the uprights 14, and a position d 'use (Figures 1 and 5), wherein the steps 40 are supported on the bars 16 corresponding.

Le long d'au moins l'un des montants 14 du cadre antérieur 10 s'étend une tringle 50, sous forme d'une bande aplatie, laquelle est interposée entre le bord latéral des marches 40 et le montant 14. La tringle 50 est articulée à chaque marche au moyen de charnières. Ces charnières sont indiquées par 52, hormis celle de l'avant-dernière marche supérieure, est indiquée par 60.Along at least one of the uprights 14 of the front frame 10 extends a rod 50, in the form of a flattened strip, which is interposed between the lateral edge of the steps 40 and the upright 14. The rod 50 is articulated at each step by means of hinges. These hinges are indicated by 52, except that of the penultimate upper step, is indicated by 60.

Les charnières 52, 60 définissent des axes d'articulation situés à l'avant par rapport aux axes ou charnières 48. Ainsi que l'on comprendra, la tringle 50 constitue un organe d'accouplement qui sert à obtenir le basculement à l'unisson des marches 40 entre leurs deux positions de rangement et d'utilisation.The hinges 52, 60 define articulation axes located at the front relative to the axes or hinges 48. As will be understood, the rod 50 constitutes a coupling member which serves to obtain the tilting in unison steps 40 between their two storage and use positions.

Des encoches 54 sont ménagées dans le bord postérieur de la tringle d'accouplement 50 afin d'éviter que celle-ci n'interfère avec les charnières 48, et d'autres encoches 56 sont ménagées dans le bord antérieur de la tringle afin d'éviter que celle-ci n'interfère avec les barreaux 16.Notches 54 are provided in the posted edge laughing rod 50 to prevent it from interfering with the hinges 48, and other notches 56 are formed in the front edge of the rod to prevent it from interfering with bars 16.

A l'extrémité inférieure de la tringle d'accouplement 50 est associé un ressort hélicoïdal de traction 58, accroché au montant 14 et ayant tendance à rappeler la tringle vers le bas, c'est-à-dire à rappeler les marches 40 à la position d'utilisation des figures 1 et 5.At the lower end of the coupling rod 50 is associated a helical tension spring 58, hooked to the upright 14 and tending to return the rod downwards, that is to say to recall the steps 40 at the position of use of Figures 1 and 5.

L'extrémité supérieure de la tringle d'accouplement 50 est articulée en 60 à une extrémité d'une bielle latérale 62. L'autre extrémité de la bielle est articulée en 64 à la partie postérieure de la plate-forme supérieure 38. Grâce à cet agencement, la bielle latérale 62, la plate-forme supérieure 38 et la bielle centrale 42 constituent un embiellage dont l'effet sera expliqué en faisant référence à la figure 4.The upper end of the coupling rod 50 is articulated at 60 at one end of a lateral connecting rod 62. The other end of the connecting rod is articulated at 64 at the rear part of the upper platform 38. Thanks to this arrangement, the lateral connecting rod 62, the upper platform 38 and the central connecting rod 42 constitute a connecting rod, the effect of which will be explained with reference to FIG. 4.

Lorsque l'on écarte les deux cadres dans la direction de la double flèche B, la plate-forme supérieure bascule dans le sens de la flèche A et, par la bielle 62, produit le mouvement descendant de la tringle d'accouplement 50 selon la flèche C. Ce mouvement descendant de la tringle 50 produit à son tour le basculement à l'unisson des marches 40 selon les flèches D. Le mouvement descendant de la tringle 50 est aidé par le ressort 58, la traction duquel s'ajoute à la poussée exercée vers le bas sur la tringle 50. Dans le cas d'une tringle 50 aplatie, ceci évite la possibilité de coincements à la suite d'un flambage que la tringle 50 pourrait subir en l'absence du ressort 58.When the two frames are moved aside in the direction of the double arrow B, the upper platform rocks in the direction of arrow A and, by the connecting rod 62, produces the downward movement of the coupling rod 50 according to the arrow C. This downward movement of the rod 50 in turn produces the tilting in unison of the steps 40 according to the arrows D. The descending movement of the rod 50 is assisted by the spring 58, the traction of which is added to the downward push on the rod 50. In the case of a flattened rod 50, this avoids the possibility of jamming following a buckling that the rod 50 could undergo in the absence of spring 58.

Les mouvements qui ont lieu lorsqu'on replie l'escabeau sont bien entendu inverses par rapport aux précédents et se produisent à l'encontre de la force de traction du ressort 58.The movements which take place when the stepladder is folded up are of course opposite to the previous ones and occur against the tensile force of the spring 58.

Grâce aux systèmes de liaison, décrits ci-dessus, entre les marches 38, 40 d'une part, et entre la marche 38 et les deux cadres 10 et 12, d'autre part, afin d'obtenir le mouvement des marches entre leurs deux positions l'utilisateur ne doit faire rien d'autre qu'écarter ou rapprocher les deux cadres 10 et 12.Thanks to the connection systems, described above, between the steps 38, 40 on the one hand, and between the step 38 and the two frames 10 and 12, on the other hand, in order to obtain the movement of the steps between their two positions the user must do nothing other than move aside or bring the two frames 10 and 12 closer together.

Claims (5)

1. Escabeau pliant, du genre comprenant un cadre antérieur (10) et un cadre postérieur (12), chacun desquels comprend une paire de montants (14, 20), ces cadres (10, 12) étant articulés entre eux à la partie supérieure de leurs montants (14,20) pour permettre leurs mouvements entre une position écartée d'utilisation et une position aplatie de rangement, escabeau dans lequel à -la partie supérieure de l'un des cadres est articulée une plate-forme (38) reliée à articulation à l'autre cadre par une bielle, et dans lequel les montants (14) du cadre antérieur (10) sont reliés entre eux par une série de barreaux (16), entre ces montants (14) est disposée une série de marches pivotantes (40), chacune desquelles est située à la hauteur d'un barreau (16), et aux marches (40) et la plate-forme (38) est articulée une tringle (50) agencée de façon à ce que lorsque l'on fait passer les deux cadres (10, 12) de la position écartée à la position aplatie les marches (40) et la plate-forme (38) pivotent à l'unisson de la position horizontale à une position escamotée entre les montants (14) du cadre antérieur (10), et inversement, caractérisé en ce chacune des marches (40) est articulée, à sa partie postérieure, aux montants (14) du cadre antérieur (10) autour d'un axe de pivotement (48) situé en arrière par rapport au barreau (16) correspondant, la tringle (50) est diposée le long de la face intérieure d'un des montants (14) du cadre antérieur (10), entre celui-ci et les marches (40), les articulations (52, 60) de la tringle aux marches (40) sont situées entre les axes (48) de pivotement des marches (40) et les barreaux (16), et les marches (40) sont agencées de façon à ce que, lorsqu'elles sont horizontales, leurs parties antérieures prennent appui sur les barreaux (16).1. Folding stepladder, of the type comprising an anterior frame (10) and a posterior frame (12), each of which comprises a pair of uprights (14, 20), these frames (10, 12) being hinged together at the top of their uprights (14,20) to allow their movements between a separated position of use and a flat storage position, stepladder in which at the upper part of one of the frames is articulated a platform (38) connected articulated to the other frame by a connecting rod, and in which the uprights (14) of the front frame (10) are interconnected by a series of bars (16), between these uprights (14) is arranged a series of steps pivoting (40), each of which is situated at the height of a bar (16), and on the steps (40) and the platform (38) is articulated a rod (50) arranged so that when the we pass the two frames (10, 12) from the spread position to the flattened position the steps (40) and the platform (38) pivot in unison from the horizontal position to a retracted position between the uprights (14) of the front frame (10), and vice versa, characterized in that each of the steps (40) is articulated, at its rear part, to the uprights (14) of the front frame (10) around a pivot axis (48) located behind the corresponding bar (16), the rod (50) is disposed along the inner face of one of the uprights (14) of the front frame (10), between the latter and the steps (40), the joints (52, 60) of the rod at the steps ches (40) are located between the pivot axes (48) of the steps (40) and the bars (16), and the steps (40) are arranged so that, when they are horizontal, their front parts take support on the bars (16). 2. Escabeau pliant selon la revendication 1, caractérisé en ce que la plate-forme supérieure (38) est articulée par sa partie antérieure sur un barreau horizontal supérieur (18) du cadre antérieur (10), et une partie postérieure de cette plate-forme (38) est reliée, par une bielle latérale (62), à l'extrémité supérieure de la tringle d'accouplement (50), tandis qu'une partie de milieu de la plate-forme (38)est reliée par une bielle centrale (42) à un barreau horizontal supérieur (24) du cadre postérieur (12), la plate-forme supérieure (38) étant susceptible de basculer entre ces deux positions de rangement et d'utilisation par des mouvements de rotation de sens opposés par rapport aux mouvements correspondants des marches (40), et l'agencement étant tel que le mouvement d'écartement des deux cadres (10, 12) produit, par l'entremise de la bielle centrale (42), le rabattement vers l'arrière de la plate-forme (38), depuis la position de rangement jusqu'à la position d'utilisation dans laquelle, les deux cadres (10, 12) étant dans la position d'utilisation, la plate-forme supérieure (38) prend appui horizontalement sur le barreau supérieur2. Folding stepladder according to claim 1, characterized in that the upper platform (38) is articulated by its front part on an upper horizontal bar (18) of the front frame (10), and a rear part of this platform- form (38) is connected, by a lateral connecting rod (62), to the upper end of the coupling rod (50), while a middle part of the platform (38) is connected by a connecting rod central (42) to an upper horizontal bar (24) of the rear frame (12), the upper platform (38) being capable of tilting between these two storage and use positions by rotational movements in opposite directions by relative to the corresponding movements of the steps (40), and the arrangement being such that the spacing movement of the two frames (10, 12) produces, by means of the central connecting rod (42), the folding back of the platform (38), from the storage position to the position of use in laq uelle, the two frames (10, 12) being in the position of use, the upper platform (38) is supported horizontally on the upper bar (24) du cadre postérieur (12) et l'articulation de la bielle centrale (42) à la plate-forme (38) est sensiblement coplanaire aux barreaux supérieurs (18, 24) des deux cadres (10, 12) pour empêcher le rabattement des marches (40) à la position de rangement. 3. Escabeau pliant selon la revendication 2, caractérisé en ce que la plate-forme supérieure (38) est pourvue d'au moins une chape (46) dans laquelle le barreau supérieur (24) du cadre postérieur est susceptible de s'engager pour constituer une garantie contre l'écartement ultérieur des cadres (10, 12) au-delà de la position d'utilisation.(24) of the rear frame (12) and the articulation of the central connecting rod (42) to the platform (38) is substantially coplanar with the upper bars (18, 24) of the two frames (10, 12) to prevent the drawdown of steps (40) to the storage position. 3. Folding stepladder according to claim 2, characterized in that the upper platform (38) is provided with at least one yoke (46) in which the upper bar (24) of the rear frame is capable of engaging for constitute a guarantee against subsequent spreading of the frames (10, 12) beyond the position of use. 4. Escabeau pliant selon la revendication 1 ou 2, caractérisé en ce que qu'à l'extrémité inférieure de la tringle d'accouplement (50) est associé un ressort (58) de traction vers le bas.4. Folding stepladder according to claim 1 or 2, characterized in that at the lower end of the coupling rod (50) is associated a spring (58) for pulling down. 5. Escabeau pliant selon l'une des revendications précédentes, caractérisé en ce que les deux-montants (14) du cadre antérieur (10) sont disposés transversalement à l'intérieur des deux montants (20) du cadre postérieur (12), les montants (20) du cadre postérieur (12) sont reliés entre eux par des barreaux transversaux horizontaux (24, 26) et les montants (14) du cadre antérieur (10) présentent, dans leurs bords postérieurs, des encoches (32, 34) de réception des barreaux (24, 26) du cadre postérieur, de façon à permettre que le cadre antérieur (10) s'escamote dans le cadre postérieur (12) dans la position d'inactivité de ces deux cadres.5. Folding stepladder according to one of the preceding claims, characterized in that the two uprights (14) of the front frame (10) are arranged transversely inside the two uprights (20) of the rear frame (12), uprights (20) of the rear frame (12) are interconnected by horizontal transverse bars (24, 26) and the uprights (14) of the front frame (10) have, in their rear edges, notches (32, 34) receiving the bars (24, 26) of the rear frame, so as to allow the front frame (10) to retract into the rear frame (12) in the inactive position of these two frames.
EP82830081A 1981-04-30 1982-04-02 Foldable stepladder Withdrawn EP0065492A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5318881U 1981-04-30
IT5318881U IT8153188V0 (en) 1981-04-30 1981-04-30 BOOKLET SCALE

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EP0065492A2 true EP0065492A2 (en) 1982-11-24
EP0065492A3 EP0065492A3 (en) 1984-04-11

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Family Applications (1)

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EP82830081A Withdrawn EP0065492A3 (en) 1981-04-30 1982-04-02 Foldable stepladder

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EP (1) EP0065492A3 (en)
IT (1) IT8153188V0 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175948A (en) * 1985-06-04 1986-12-10 Brian Weston Step ladder
WO1999047783A1 (en) * 1998-03-19 1999-09-23 R.M.M. Corp., Inc. Ladder with handle and ledge
EP1679423A1 (en) * 2004-12-24 2006-07-12 Hymer-Leichtmetallbau GmbH & Co. KG Step ladder with foldable platform
WO2010102022A1 (en) * 2009-03-03 2010-09-10 Wing Enterprises, Incorporated Stepladders and related methods

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB183686A (en) * 1921-07-05 1922-08-03 Octavius John Williams Improvements in and relating to step-ladders
DE535785C (en) * 1931-10-16 Ernst Plenter Collapsible stepladder with steps that can be folded into one level using common guide rails
US2509206A (en) * 1946-03-20 1950-05-30 Vincent J Buckner Stepladder
FR1093081A (en) * 1954-11-22 1955-04-29 Fotim Stepladder with folding steps
FR1103090A (en) * 1954-04-15 1955-10-28 Self-folding metal stepladder
FR1383452A (en) * 1964-02-25 1964-12-24 Loh Kg Hailo Werk Double step ladder
FR2036361A5 (en) * 1969-03-17 1970-12-24 Cordel & Cie
DE2741091A1 (en) * 1977-09-13 1979-03-22 Jep Reuter Ing Grad Krag Compact portable folding step ladder - is less than twice leg thickness when folded by interconnection with parallelogram guideway

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE535785C (en) * 1931-10-16 Ernst Plenter Collapsible stepladder with steps that can be folded into one level using common guide rails
GB183686A (en) * 1921-07-05 1922-08-03 Octavius John Williams Improvements in and relating to step-ladders
US2509206A (en) * 1946-03-20 1950-05-30 Vincent J Buckner Stepladder
FR1103090A (en) * 1954-04-15 1955-10-28 Self-folding metal stepladder
FR1093081A (en) * 1954-11-22 1955-04-29 Fotim Stepladder with folding steps
FR1383452A (en) * 1964-02-25 1964-12-24 Loh Kg Hailo Werk Double step ladder
FR2036361A5 (en) * 1969-03-17 1970-12-24 Cordel & Cie
DE2741091A1 (en) * 1977-09-13 1979-03-22 Jep Reuter Ing Grad Krag Compact portable folding step ladder - is less than twice leg thickness when folded by interconnection with parallelogram guideway

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175948A (en) * 1985-06-04 1986-12-10 Brian Weston Step ladder
WO1999047783A1 (en) * 1998-03-19 1999-09-23 R.M.M. Corp., Inc. Ladder with handle and ledge
EP1679423A1 (en) * 2004-12-24 2006-07-12 Hymer-Leichtmetallbau GmbH & Co. KG Step ladder with foldable platform
WO2010102022A1 (en) * 2009-03-03 2010-09-10 Wing Enterprises, Incorporated Stepladders and related methods
US8701831B2 (en) 2009-03-03 2014-04-22 Wing Enterprises, Inc. Stepladders and related methods
US9920572B2 (en) 2009-03-03 2018-03-20 Wing Enterprises, Incorporated Stepladders and related methods

Also Published As

Publication number Publication date
IT8153188V0 (en) 1981-04-30
EP0065492A3 (en) 1984-04-11

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