EP0369256B1 - Echelle à articulation - Google Patents

Echelle à articulation Download PDF

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Publication number
EP0369256B1
EP0369256B1 EP89120370A EP89120370A EP0369256B1 EP 0369256 B1 EP0369256 B1 EP 0369256B1 EP 89120370 A EP89120370 A EP 89120370A EP 89120370 A EP89120370 A EP 89120370A EP 0369256 B1 EP0369256 B1 EP 0369256B1
Authority
EP
European Patent Office
Prior art keywords
ladder
telescopic
hinged
stringer
stringers
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
EP89120370A
Other languages
German (de)
English (en)
Other versions
EP0369256A1 (fr
Inventor
Günther Krause
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.)
Krause Werk GmbH and Co KG
Original Assignee
Krause Werk GmbH and Co KG
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
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Application filed by Krause Werk GmbH and Co KG filed Critical Krause Werk GmbH and Co KG
Publication of EP0369256A1 publication Critical patent/EP0369256A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • E06C1/32—Ladders with a strut which is formed as a ladder and can be secured in line 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
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/42—Ladder feet; Supports therefor

Definitions

  • the invention relates to an articulated ladder with two ladder elements connected via joints, each comprising a plurality of rungs fastened to mutually parallel bars, a telescopic ladder element being mounted longitudinally displaceably and being height-adjustable on the ladder element by means of a latching device, the bars of the telescopic ladder element in each case lie against the outer sides of the spars of the ladder element and at least partially encompass them, furthermore the spars of each telescopic ladder element have an essentially U-shaped cross section, and wherein the latching device comprises at least one latching button which is displaceably mounted on the telescopic ladder element and in the front recesses of the rungs of the conductor element is insertable.
  • DE-A-3 446 255 which forms the closest prior art, shows a locking button which is slidably mounted on a spar of a conductor element.
  • the locking button has a substantially U-shaped shape and is designed such that one leg is mounted on the conductor element is while the other leg of the U-shaped profile can be inserted into recesses of the second spar of the other conductor element.
  • To use such a locking button it is necessary that the two conductor elements are arranged essentially parallel to each other, since the two legs of the U-profile must be in engagement with a conductor element.
  • This results in a decisive disadvantage which is that, due to the distance between the respective spars required for moving the conductor elements, the connection by means of the locking button is not very stable. Furthermore, there is a risk that the locking button will be released by improper handling during use of the ladder, so that the ladder no longer has the required stability.
  • the invention has for its object to provide an articulated ladder of the type mentioned, which ensures a secure locking of the individual conductor elements with a simple structure and easy handling.
  • the invention is characterized by a number of significant advantages.
  • the arrangement and storage of the locking button according to the invention ensures that malfunctions are excluded, since the spar of the outer conductor element engages around the spar of the inner conductor element and thus the locking button only has to be adjusted in one direction so that it engages with the spar of the respective one Conductor element can be brought. This achieves a high degree of operational safety, as tilting, tilting or similar can be completely excluded.
  • Another significant advantage of the latching according to the invention is that it is particularly easy to manufacture, since the guide bush only has to be inserted into a recess in the spar; no welding work is required which could lead to a weakening of the material.
  • the socket can thus be either permanently or detachably attached to the spar, so that there is the possibility, in particular in the case of universally usable conductors, of using the latching device at the desired point.
  • the telescopic ladder element used for the extension is in each case mounted on the ladder element according to the invention, it is possible to design the ladder element in the usual way, that is to say to equip a commercially available articulated ladder by means of the telescopic ladder element in such a way that it can be adjusted in height over a large height range. Furthermore, the strength of the conductor element of the articulated conductor is not influenced by the telescopic conductor element, since no attachments which weaken the conductor element are required. In addition, the two conductor elements can be connected to one another via a conventional joint.
  • the spars of the telescopic conductor element each bear against the outside of the spars of the conductor element and at least partially encompass the spars.
  • the spars of the telescopic conductor element have an essentially U-shaped cross section. This design of the spars of the telescopic ladder element makes it possible to store them firmly and tilt-proof on the respective ladder element without the risk that the profiles of the spars and / or the rungs of the ladder element will be damaged, since a there is a large area of contact between the spars of the telescopic conductor element and the spars of the conductor element.
  • the rungs of the telescopic ladder element are designed in the form of hollow profiles pressed together at their ends. With this configuration, it is not necessary to provide additional cover caps or the like at the ends of the rungs. Furthermore, the risk of injury is minimized since there are no or only insignificant edges.
  • the spars of the telescopic conductor element each have a longitudinal groove in which the ends of the rungs, i.e. the compressed end regions, are fastened.
  • the rungs can be stored particularly securely, and on the other hand the end area of the rungs is encompassed, so that exposed sharp edges, which can lead to injuries, are avoided. Furthermore, in this embodiment it is possible to firmly connect the rungs to the respective spar by means of only a single weld seam. This measure on the one hand significantly reduces the manufacturing costs, and on the other hand it proves to be particularly advantageous for optical reasons to have to use only a single weld seam.
  • the latching device comprises at least one latching button which is slidably mounted on the spar of the respective telescopic ladder element and can be inserted into the front recesses of the rungs of the ladder element. Since the rungs are usually designed in the form of hollow profiles which are inserted and flanged through recesses in the respective spars, there are already recesses available, which can be used for the locking device. Additional recesses, notches or the like on the bars of the conductor element are therefore not necessary. The conductor element is therefore not weakened by the attachment of the latching device. Furthermore, there is no risk that the profiles of the conductor element will be damaged. Since the latching button is also mounted on the spar of the respective telescopic conductor element, an optimal assignment of the latching device to the spar of the telescopic conductor element is always ensured, so that sufficient tipping safety is ensured.
  • the locking button comprises a bolt which can be locked in at least two different longitudinally displaced positions by means of a locking element. It is thus possible to lock the locking button in a locked state and in a released state. This avoids, on the one hand, that the latching device loosens itself during use of the articulated conductor and, on the other hand, it ensures that the telescopic conductor element can be displaced relative to the conductor elements of the articulated conductor without the locking button preventing the displacement inadvertently.
  • a connecting element is mounted on the upper ends of the spars of at least one telescopic ladder element, which can be fastened to the upper end of the respective spar of the other telescopic ladder element.
  • the operator thus has the option of forming two double ladders each from the ladder elements connected by the joint and the two telescopic ladder elements connected to one another, over which a screed or the like can be placed in order to form a work scaffold.
  • a connecting element in the form of a flap pivotably mounted on the respective spar is used to securely connect the two telescopic conductor elements, the free end of which is provided with a recess for carrying out the locking button of the respective other telescopic conductor element.
  • the latching buttons of the telescopic conductor elements it is thus possible to use the latching buttons of the telescopic conductor elements to connect the two telescopic conductor elements by means of the connecting element.
  • This embodiment has the advantage that damage to the profiles of the telescopic conductor elements is avoided, since the fastening points of the locking buttons, via which the force is applied, already have sufficient strength.
  • the upper end of the spar of the telescopic conductor element is provided with a slot-like recess for the passage of the tab. Since the location of the attachment of the tab is fixed, the slot-like recess can be designed such that it extends only over a small area of the total length of the spar.
  • the tab is preferably pivotable below the each associated locking button stored. Since the tab is pivoted upwards under load when the upper regions of the spars of the telescopic conductor element are connected, the tab comes into contact with the latching button or its bolt and is supported by the latter. This also avoids damage to the profile of the spars of the telescopic conductor element.
  • an extension strut is mounted at the lower end of the spar of the telescopic ladder element. It is thus possible to vary the length of each of the spars individually.
  • the extension strut is preferably displaceable along the spar and can be locked by means of a locking device. It can prove to be advantageous to design the extension strut with a cross-section which corresponds approximately to the cross-section of the conductor elements, so that a firm hold on the spar of the telescopic conductor element is ensured.
  • the articulated conductor according to the invention is, as described, constructed from simple, inexpensive to produce individual parts and is extremely simple to manufacture. All of this results in very low overall costs and an economical manufacturing option
  • the articulated conductor according to the invention comprises two conductor elements 1, which are connected to one another by means of a joint 6 arranged at their upper end.
  • the joint 6 is designed in the usual way and can be locked at certain pivoting angles.
  • the ladder elements 1 each comprise two spars 2, in which a plurality of rungs 3 are inserted.
  • the spars 2 have a rectangular cross section and are provided with square or square recesses into which the rungs 3, which are likewise designed in the form of a hollow profile, fit can be used.
  • the outer ends of the rungs 3 are each fastened to the rungs 3 by means of a flange 18.
  • the interior of the hollow profiles of the rungs 3 is accessible from the outside of the spars 2.
  • Telescopic ladder elements 4 are each mounted on the spars 2 of the ladder elements 1, each comprising two spars 7 and a plurality of rungs 8. The design of the telescopic conductor elements is described in more detail.
  • the telescopic ladder elements can be moved along the ladder elements 1 and can be fixed in their respective positions by means of latching devices 5.
  • the spars 7 each have a base 19 at the lower ends.
  • FIG. 4 shows a section along the line IV-IV of FIG. 1. It can be seen that the spar 7 of the telescopic conductor element has a substantially U-shaped cross section and encompasses the spar 2 of the conductor element 1 on three sides. A longitudinal groove 9 is formed on an outside of the U-shaped cross section.
  • the rungs 8 of the telescopic conductor element 4 are also in the form of a, preferably square, hollow profile and are squeezed at their ends so that the ends can be inserted into the longitudinal groove 9.
  • the rungs 8 are fastened to the spar 9 by means of a weld seam 20.
  • a recess is formed on the side surface of the spar 7, into which a guide bushing 21 is inserted, in which a locking button 10 or its bolt 11 is mounted.
  • the detent button 10 or the bolt 11 is slidably mounted in a guide bushing 21, which is designed as a cylindrical tube.
  • the cylindrical tubular guide bush is inserted into a recess in the spar 7, as shown in FIG. 4.
  • the guide bushing 21 comprises an annular flange, the outer diameter of which is larger than the inner diameter of the recess of the spar 7.
  • annular groove 22 in which a latching element 12, preferably in the form of a wire-shaped spring element, is arranged.
  • Two annular grooves 23, 24 are provided on the outer circumference of the bolt 11 of the locking button 10, the annular groove 24 being provided on the outermost end region of the bolt 11, while the annular groove 23 is formed on the region facing the locking knob 10.
  • the annular grooves 23, 24 are designed such that the spring-like latching element 12 can be inserted into the annular groove 23 or 24 for latching the latching button 10. It is thus possible to lock the locking button 10 in the position shown in FIG. 4, in which it projects into the recess in the rung 3 and ensures a secure fixation of the telescopic conductor element relative to the conductor element.
  • the annular groove 22 can only extend over a partial region of the circumference of the guide bush 21 in order not to impair its strength.
  • tabs 13 are mounted on the upper region of one telescopic conductor element, each of which can be pivoted about a pivot point 25.
  • the free end of each tab is provided with a recess 14 which is dimensioned such that the bolt 11 of the locking button 10 of the other telescopic conductor element 4 can be passed through the recess 14.
  • the fulcrum 25 is arranged below the assigned locking button 10, as shown in FIG. 2.
  • the spar 7 has at its upper end a slot-like recess 15 through which the tab can be pushed.
  • the tab 13 bears against the locking button 10 arranged above its pivot point 25 and against the wall of the recess 15, so that damage to the profile of the bars 7 is avoided.
  • the lower ends of the telescopic conductor elements 4 can each be extended laterally in order to increase the stability of the articulated conductor according to the invention.
  • FIG. 6 shows a sectional view along line VI-VI of FIG. 1.
  • extension struts at the lower end of the spars 7 of the telescopic ladder element 4 16 mounted, which can be moved along the respective spar 7 and fixed by means of a locking device 17.
  • the extension strut 16 has essentially the same cross section as the spar 2 of the conductor element 1, so that it can be firmly enclosed by the profile of the spar 7 of the telescopic conductor element 4.
  • an elongated hole 26 is formed, in which a threaded bolt 27 is displaceable, which with a nut 29 is screwed, which can be biased against a pressure plate 28.
  • the screw 27 is connected to a hand knob 30.
  • the articulated ladder according to the invention thus makes it possible to move the telescopic ladder elements 4 relative to the ladder elements 1 by actuating the latching button 10 in order to vary the working height of the ladder in this way. Since the locking takes place by means of the locking buttons 10 on the rungs 3 of the ladder elements, it is ensured that, as shown in FIG. 1, the rungs 8 of the telescopic ladder elements are always assigned to the rungs 3 of the ladder elements 1, so that the operator is not disturbed unfavorable assignment of the individual rungs can take place. According to the invention, it is possible to push the telescopic conductor elements 4 completely onto the conductor elements 1 or to separate them completely in order to connect the telescopic conductor elements 4 to one another, as shown in FIG. 2, and in this way to have a separate double conductor available. By pivoting the joint 6, it is also possible to arrange the conductor elements 1 in alignment with one another, so that a high-rise instead of a ladder can be formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (13)

  1. Echelle à articulation comportant deux éléments d'échelle (1) reliés par des articulations (6) et présentant chacun plusieurs barreaux (3) fixés à des montants (2) parallèles entre eux, un élément télescopique (4) étant monté coulissant le long de chaque élément d'échelle (1) et pouvant être immobilisé sur l'élément d'échelle (1) au moyen d'un dispositif de blocage (5), de façon à permettre une modification de la hauteur, étant entendu que les montants (7) de l'élément télescopique (4) sont chacun placés contre la face extérieure du montant (2) de l'élément d'échelle (1) concerné et qu'ils l'entourent au moins partiellement, et étant entendu que, de plus, le montant (7) de chaque élément télescopique (4) présente une section essentiellement en forme de U, et que le dispositif de blocage (5) comporte au moins un bouton de blocage (10) monté déplaçable sur l'élément télescopique (4) et pouvant être introduit dans les évidements situés en bout des barreaux (3) de l'élément d'échelle (1),
       caractérisé en ce que le bouton de blocage (10) est monté sur le montant (7) de chaque élément télescopique (4) et comporte un axe (11), guidé, de façon à pouvoir coulisser longitudinalement, par une douille de guidage (21), elle-même disposée sur les bords d'un évidement situé dans la zone de la base de la section en forme de U du montant (7),
       en ce que, pour introduire l'axe (11) dans les évidements en bout des barreaux (3) de l'élément d'échelle (1), la douille de guidage (21), en faisant coulisser le montant (7), on peut placer dans l'alignement de l'évidement concerné,
    et en ce que l'axe (11) peut être bloqué au moyen d'un organe de blocage (12) dans au moins une position.
  2. Echelle à articulation suivant la revendication 1, caractérisé en ce que la douille de guidage (21) est réalisée sous la forme d'un tube cylindrique et présente une bride annulaire placée contre la face intérieure du montant (7).
  3. Echelle à articulation suivant la revendication 2, caractérisé en ce que l'axe (11) peut, au moyen d'un organe de blocage (12), être bloqué dans au moins deux positions, décalées longitudinalement.
  4. Echelle à articulation suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que les barreaux (8) de l'élément télescopique (4) sont réalisés sous la forme de profilés creux, dont les extrémités ont été applaties sur elles-mêmes.
  5. Echelle à articulation suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que les montants (7) de l'élément télescopique (4) présentent chacun une rainure longitudinale (9), dans laquelle sont fixées les extrémités des barreaux (8).
  6. Echelle à articulation suivant l'une quelconque des revendications 1 à 5, caractérisé en ce qu'à chacune des extrémités supérieures des montants (7) d'au moins un élément télescopique (4)' est fixé un organe de liaison qui peut être fixé à l'extrémité supérieure du montant (7) correspondant de l'autre élément télescopique (4).
  7. Echelle à articulation suivant la revendication 6, caractérisé en ce que l'organe de liaison est réalisé sous la forme d'une éclisse (13), montée pivotante sur chaque montant (7) concerné, et dont l'extrémité libre est munie d'un évidement (14) pour le passage du bouton de blocage (10).
  8. Echelle à articulation suivant la revendication 7, caractérisé en ce que l'extrémité supérieure du montant (7) de l'élément télescopique (4) est réalisée avec un évidement (15) en forme de fente pour le passage de l'éclisse (13).
  9. Echelle à articulation suivant la revendication 7 ou la revendication 8, caractérisé en ce que l'éclisse (13) est montée en-dessous de chaque bouton de blocage (10) concerné.
  10. Echelle à articulation suivant l'une quelconque des revendications 1 à 9, caractérisé en ce qu'à l'extrémité inférieure du montant (7) de l'élément télescopique (4), est montée une barre d'allongement (16).
  11. Echelle à articulation suivant la revendication 10, caractérisé en ce que la barre d'allongement (16) peut coulisser le long du montant (7) et peut être fixée au moyen d'un dispositif de fixation (17).
  12. Echelle à articulation suivant l'une quelconque des revendications 1 à 11, caractérisé en ce que les extrémités inférieures des montants (7) de l'élément télescopique (4) sont décalées latéralement.
  13. Echelle à articulation suivant l'une quelconque des revendications 1 à 12, caractérisé en ce que, pour l'utilisation de l'échelle comme plate-forme de travail, l'articulation (6) peut pivoter sur une zone d'environ 180°, et peut être fixée dans cette position et dans des positions intermédiaires.
EP89120370A 1988-11-12 1989-11-03 Echelle à articulation Expired - Lifetime EP0369256B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8814195U 1988-11-12
DE8814195U DE8814195U1 (fr) 1988-11-12 1988-11-12

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP90116232.1 Division-Into 1990-08-24

Publications (2)

Publication Number Publication Date
EP0369256A1 EP0369256A1 (fr) 1990-05-23
EP0369256B1 true EP0369256B1 (fr) 1995-01-11

Family

ID=6829823

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89120370A Expired - Lifetime EP0369256B1 (fr) 1988-11-12 1989-11-03 Echelle à articulation
EP90116232A Expired - Lifetime EP0425786B1 (fr) 1988-11-12 1989-11-03 Echelle

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90116232A Expired - Lifetime EP0425786B1 (fr) 1988-11-12 1989-11-03 Echelle

Country Status (5)

Country Link
US (1) US5074377A (fr)
EP (2) EP0369256B1 (fr)
AT (2) ATE117046T1 (fr)
DE (3) DE8814195U1 (fr)
ES (2) ES2048914T3 (fr)

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US4407045A (en) * 1981-12-21 1983-10-04 Boothe Leland H Ladder hinge and multi-position locking mechanism therefor
US4606432A (en) * 1984-10-29 1986-08-19 Belt Ned W Adjustable ladder leg
DE3446255A1 (de) 1984-12-19 1986-06-19 Nikolaus Adalbert 7730 Villingen-Schwenningen Kümmerlin Leiter
DE8701700U1 (fr) * 1987-02-05 1987-04-09 Munk, Leopold, 8870 Guenzburg, De

Also Published As

Publication number Publication date
US5074377A (en) 1991-12-24
EP0369256A1 (fr) 1990-05-23
DE58908880D1 (de) 1995-02-23
EP0425786B1 (fr) 1994-02-02
ATE117046T1 (de) 1995-01-15
DE8814195U1 (fr) 1989-01-26
DE58906913D1 (de) 1994-03-17
EP0425786A1 (fr) 1991-05-08
ES2066824T3 (es) 1995-03-16
ATE101236T1 (de) 1994-02-15
ES2048914T3 (es) 1994-04-01

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