EP0310884B1 - Folding ladder - Google Patents

Folding ladder Download PDF

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Publication number
EP0310884B1
EP0310884B1 EP88115651A EP88115651A EP0310884B1 EP 0310884 B1 EP0310884 B1 EP 0310884B1 EP 88115651 A EP88115651 A EP 88115651A EP 88115651 A EP88115651 A EP 88115651A EP 0310884 B1 EP0310884 B1 EP 0310884B1
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EP
European Patent Office
Prior art keywords
rung
rungs
ladder
foldable
distance
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EP88115651A
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German (de)
French (fr)
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EP0310884A1 (en
Inventor
Dieter Collet
Emil Freiwald
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Individual
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Individual
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Priority to AT88115651T priority Critical patent/ATE75293T1/en
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    • 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
    • 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
    • E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
    • E06C1/3835—Foldable ladders in which the longitudinal members are brought together on folding having collapsible steps comprising a hinge in their central part
    • 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
    • E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding

Definitions

  • the invention relates to a foldable ladder with foldable rungs, which have a 90 ° pivot point in the central region, the rungs also being rotatably installed in the risers by 90 ° via a rung end axle joint.
  • German Offenlegungsschriften 29 23 397 and 33 20 519 are to be mentioned.
  • DE-OS 29 23 397 relates to a folding ladder with two spars, to which rungs each consisting of two directly articulated parts are articulated, the different pivot axes being parallel to one another and perpendicular to the plane of the ladder, with a resistant, preferably tubular rod for Connection of the articulation points of the rung parts with each other, and with a support frame arranged under the bottom rung of the ladder, the support legs of which have a greater length than the rung parts and are articulated on the one hand on the spars and on the other hand, the tip of the support frame being arranged over the ends of the support legs is and forms a support for the lower end of the resilient rod when the conductor is fully spread apart, the pivot axes of the support legs of the support frame being arranged on the spars at fixed locations with respect to the spars, and that the pivot axis in the region I the articulation of the two support legs to one another is movable relative to the resistant rod, the stop surface formed by the tip of the support frame itself being held
  • DE-OS 33 20 519 describes a folding ladder in which the ladder rungs are folded in the middle and are hinged to the ladder stiles. There is a central locking linkage that is not a pushing linkage and that is not slidably arranged in the spar.
  • the present invention has for its object to provide such a folding ladder that allows a completely uniform buckling movement of the rungs, but at the same time there is no impairment of the climbing process.
  • a spacer roller for supporting the elongated rungs can be installed in the central joint, as in the end joints, whereby the step web can be formed in the middle of the rung from both sides so that the step webs abut each other and the pressure point is on the rung ends is supported.
  • the risers are preferably U-shaped and the material thickness in connection with the likewise U-shaped crossbars is preferably held so that the overall stability corresponds to the standards on which ladders are based, the accuracy of safety being ensured by suitable fitting pieces.
  • One of the main functions of the folding ladder according to the invention is to be easily transportable as a ladder on caravans, on the boat, in the house, since the folding ladder has the shape of a "rod" with a rectangular cross-section when folded.
  • An aluminum alloy is preferably to be provided as material, the rivets are preferably made of chromium-nickel steel. Furthermore, the aluminum brings the desired corrosion resistance and the desired weight saving.
  • Figure 1 is a foldable ladder with foldable rung bars 3, each with a central joint and built in the riser rung end axis joints 6; 9 shown, the foldability is guaranteed.
  • the ratchet points 7, 8 are tied to the synchronism of the rungs movement from rungs to rungs 3 by a push rod 2 on the right and left, whereby the axis intersection with the push rod rivet must be precisely positioned.
  • Figure 1 is the ladder in the working position with extended rung position 18 in the 90 ° pivot point 4 in the central region of the foldable rungs by means of the spacer rollers 5 with the step butt edge 14 to the pressure point in the end position in cooperation with the rung end axis joints installed in the spars at the end of the rungs 9 installed at anchor point 7 firmly anchored.
  • the ladder can be seen in the rest position as a space-saving, cubically acting rod 17, here 20 shows a locking lock or lockability.
  • the push rod is shown in FIG. 2, and the rivetability from rung web to rung web is shown at 16.
  • the position of use of the foldable ladder is anchored in the area of the bottom rung with brackets 21 by means of the middle bracket 27, 23 being a support for the linkage in the base of the ladder, which engages in support, whereby the counter-strut makes the ladder stable.
  • the center pivot point of the rung is stabilized by means of a spacer roller 5 which, by means of the locking core pin 30, absorbs all rotary movements in a free-standing manner up to the end point position 28, the central bracket 27 designed as a cross bolt ensuring the final engagement.
  • Figure 7 shows the almost cubic closed section viewed from above. It is the compact part with the spacer roller 5, which serves for stabilization; 25 denotes the movable push rods which make it possible to slide into the counter spars by means of the spacers; the center point of the round is the final locking, as are the U-spars of FIG. 6 in FIG. 7 that are pushed against each other.
  • Figures 8-17 show further exemplary embodiments of the subject matter of the invention.
  • the risers are at 31, the stepping rungs are foldable at 32, the push rods are offset at 33, and at 34 they are precise from rung web to rung web fixed joint rivets for the uniform pushing movement of the rungs, with 35 the spacer rings adapted to the push rod are attached to the axis connecting 31 and 32 39 as well as 36 spacer rings for the rung offset, under 37 is a load-bearing spacer roller, with 38 is the rungs connecting axis inserted, under 39 the rungs with the risers are anchored by means of axis 9 with the spacer rollers in a pre-planned, surprising position, at 40 the connecting rods connected to the step bars guarantee the synchronism in the up and down movement via the intended 90 ° pivot point, whereby At the final closing point, briefly immerse the push rods on both sides of the riser on both sides, as shown in Figure 10 at 33, under 41 there is a lock on the straight rung, which also shows the stabilization of the rod
  • Figure 18 and Figure 19 show the bracket linkage 21 in a further preferred embodiment.
  • the clamping linkage 21 has at its ends arc-shaped claws 50 which grip around the axle roller 5 in the unfolded state.
  • the latching lugs 51 of each clamping rod part 21 engage in the recess 22 of the axle roller 5.
  • the axle roller 5 is guided so that the recess 52 is exactly over the locking lugs 51 in the unfolded state.
  • the size of the recess 52 is smaller than the outer dimensions of the latching lugs 51, so that when the conductors are folded out, the latching lugs 51 must be pressed into the recess 42 and thus a firm connection is created.

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  • Ladders (AREA)
  • Steps, Ramps, And Handrails (AREA)

Abstract

A foldable ladder has collapsible crosspieces having a 90-degree pivot in the middle, the crosspieces being mounted to opposite side rails likewise having 90-degree pivots. Push rails are provided to the right and left of the crosspiece inside each sidepiece so as to move the ladder between folded and depolyed positions.

Description

Die Erfindung betrifft eine zusammenfaltbare Steigleiter mit einknickbaren Sprossen, die im Mittelbereich einen 90°-Drehpunkt aufweisen, wobei die Sprossen in den Steigholmen ebenfalls um 90° über ein Sprossen-Endachsgelenk drehbar eingebaut sind.The invention relates to a foldable ladder with foldable rungs, which have a 90 ° pivot point in the central region, the rungs also being rotatably installed in the risers by 90 ° via a rung end axle joint.

Zum nächstkommenden Stand der Technik sind die deutschen Offenlegungsschriften 29 23 397 und 33 20 519 zu nennen.As for the closest prior art, German Offenlegungsschriften 29 23 397 and 33 20 519 are to be mentioned.

Die DE-OS 29 23 397 betrifft eine Faltleiter mit zwei Holmen, an denen je aus zwei direkt aneinander angelenkten Teilen bestehende Sprossen angelenkt sind, wobei die verschiedenen Schwenkachsen untereinander parallel und senkrecht zur Ebene der Leiter liegen, mit einer widerstandsfähigen, vorzugsweise rohrförmigen Stange zur Verbindung der Anlenkungsstellen der Sprossenteile untereinander, und mit einem unter der untersten Sprosse der Leiter angeordneten Stützgestell, dessen Stützschenkel eine größere Länge aufweisen als die Sprossenteile und einerseits an den Holmen sowie andererseits aneinander angelenkt sind, wobei die Spitze des Stützgestelles über den Enden der Stützschenkel angeordnet ist und ein Auflager für das untere Ende der widerstandsfähigen Stange bei voll auseinandergespreizter Leiter bildet, wobei die Schwenkachsen der Stützschenkel des Stützgestelles an den Holmen an bezüglich der Holme ortsfesten Stellen angeordnet sind, und daß die Schwenkachse im Bereich der Anlenkung der beiden Stützschenkel aneinander gegenüber der widerstandsfähigen Stange beweglich ist, wobei die durch die Spitze des Stützgestelles gebildete Anschlagfläche selbst wiederum gegenüber der widerstandsfähigen Stange beweglich gehalten ist.DE-OS 29 23 397 relates to a folding ladder with two spars, to which rungs each consisting of two directly articulated parts are articulated, the different pivot axes being parallel to one another and perpendicular to the plane of the ladder, with a resistant, preferably tubular rod for Connection of the articulation points of the rung parts with each other, and with a support frame arranged under the bottom rung of the ladder, the support legs of which have a greater length than the rung parts and are articulated on the one hand on the spars and on the other hand, the tip of the support frame being arranged over the ends of the support legs is and forms a support for the lower end of the resilient rod when the conductor is fully spread apart, the pivot axes of the support legs of the support frame being arranged on the spars at fixed locations with respect to the spars, and that the pivot axis in the region I the articulation of the two support legs to one another is movable relative to the resistant rod, the stop surface formed by the tip of the support frame itself being held movable relative to the resistant rod.

Es ist also bei dieser Faltleiter des Standes der Technik eine zentrale Spreitzstange, die kein Schubgestänge ist, und die nicht innerhalb des Holms geschoben wird, angeordnet.In this prior art folding ladder there is a central spreader bar, which is not a push rod, and which is not pushed inside the spar.

Die DE-OS 33 20 519 beschreibt eine Faltleiter, bei der die Leitersprossen in der Mitte gefaltet werden und an die Leiterholme angelenkt sind. Dabei ist ein mittiges Schließgestänge vorhanden, das kein Schubgestänge darstellt und das nicht im Holm verschieblich angeordnet ist.DE-OS 33 20 519 describes a folding ladder in which the ladder rungs are folded in the middle and are hinged to the ladder stiles. There is a central locking linkage that is not a pushing linkage and that is not slidably arranged in the spar.

Es hat sich herausgestellt, daß die Faltleitern des Standes der Technik nicht in allen Fällen die Bedürfnisse der Praxis befriedigen können. Dies gilt insbesondere für den Vollzug einer völlig gleichmäßigen Einknickbewegung.It has been found that the folding ladders of the prior art cannot satisfy the needs of practice in all cases. This applies in particular to the implementation of a completely even buckling movement.

Demgegenüber liegt vorliegender Erfindung die Aufgabe zugrunde, eine solche Faltleiter zu schaffen, die eine völlig gleichmäßige Einknickbewegung der Sprossen ermöglicht, wobei aber gleichzeitig keine Beeinträchtigung des Steigvorgangs stattfindet.In contrast, the present invention has for its object to provide such a folding ladder that allows a completely uniform buckling movement of the rungs, but at the same time there is no impairment of the climbing process.

Diese vorliegender Erfindung zugrunde liegende Aufgabe wird bei einer zusammenfaltbaren Steigleiter der eingangs genannten Gattung dadurch gelöst, daß erfindungsgemäß rechts und links an den Sprossenstegen jeweils eines die Sprossen im Abstand vom Sprossen-Endachsgelenk verbindendes Schubgestänge innerhalb der als Schienen ausgebildeten Holme (Steigholme) eingebaut ist.This object on which the present invention is based is achieved in the case of a foldable vertical ladder of the type mentioned at the outset in that, according to the invention, a push rod connecting the rungs at a distance from the rungs-end-axis joint is installed on the right and left of the rung bars within the rails (risers) designed as rails.

Bevorzugte Ausführungsformen sind Gegenstände der beiliegenden abhängigen Ansprüche.Preferred embodiments are the subject of the attached dependent claims.

Zu Belastungspunkt bei den Sprossen kann in dem Mittelgelenk, Wie in den Endgelenken, je eine Distanzrolle zum Abstützten der gestrecken Sprossen eingebaut sein, wobei in der Sprossenmitte der Trittsteg von beiden Seiten so ausgebildet sein kann, daß die Trittstege stumpf gegeneinander anliegen und der Druckpunkt an den Sprossenenden unterstützt wird.At the load point on the rungs, a spacer roller for supporting the elongated rungs can be installed in the central joint, as in the end joints, whereby the step web can be formed in the middle of the rung from both sides so that the step webs abut each other and the pressure point is on the rung ends is supported.

Die Steigschienen sind vorzugsweise U-förmig und in der Materialstärke in Verbindung mit den ebenfalls U-förmigen Sprossenstegen vorzugsweise so gehalten, daß die Gesamtstabilität den für Leitern zugrunde gelegten Normen entspricht, wobei durch entsprechende Paß-Stücke die Präzision der Sicherheit gewährleistet ist.The risers are preferably U-shaped and the material thickness in connection with the likewise U-shaped crossbars is preferably held so that the overall stability corresponds to the standards on which ladders are based, the accuracy of safety being ensured by suitable fitting pieces.

Eine der Hauptfunktionen der erfindungsgemäßen Faltleiter besteht darin, als auf engstem Raum unterbringbare Leiter an Wohnwagen, auf dem Boot, im Haus auch gut transportabel zu sein, da die Faltleiter im zusammengefalteten Zustand quasi die Form einer "Stange" mit rechteckigem Querschnitt aufweist.One of the main functions of the folding ladder according to the invention is to be easily transportable as a ladder on caravans, on the boat, in the house, since the folding ladder has the shape of a "rod" with a rectangular cross-section when folded.

Als Material ist vorzugsweise eine Aluminiumlegierung vorzusehen, die Nieten bestehen vorzugsweise aus Chromnickelstahl. Ferner bringt das Aluminium die gewünschte Korrosionsfestigkeit und die gewünschte Gewichtseinsparung.An aluminum alloy is preferably to be provided as material, the rivets are preferably made of chromium-nickel steel. Furthermore, the aluminum brings the desired corrosion resistance and the desired weight saving.

Das Wesen der vorliegenden Erfindung wird anhand der beiliegenden Figuren 1 bis 17, die bevorzugte Ausführungsformen darstellen, weiterhin erläutert. Es zeigen:

Figur 1
einen Leiterausschnitt in Gebrauchsstellung in frontaler Ansicht,
Figur 2
eine leicht eingeknickte zum Zusammenfalten angelegte Stellung der Leiter,
Figur 3
eine in Ruhestellung zusammengelegte Leiter,
Figur 4
ein Verbindungs-Schubgestänge zur Sprossenverbindung,
Figur 5
den Leiterbodenendabschnitt mit Verklammerungsgestänge,
Figur 6
die untere gestreckte Trittsprosse,
Figur 7
die zusammengeklappte Leiter als Stab im Schnitt von oben gesehen und
Figuren 8-17
zeigen weitere Einzelheiten.
Figur 18
eine Vorderansicht des Einklammerungsgestänges
Figur 19
eine Ansicht aus der in Figur 18 angedeuteten Richtung A.
The essence of the present invention is further explained with reference to the accompanying FIGS. 1 to 17, which represent preferred embodiments. Show it:
Figure 1
a ladder cutout in the use position in a frontal view,
Figure 2
a slightly bent position of the ladder for folding,
Figure 3
a ladder folded at rest,
Figure 4
a connecting push rod for the rung connection,
Figure 5
the ladder end section with clamping rods,
Figure 6
the lower straight step,
Figure 7
the folded ladder as a rod seen in section from above and
Figures 8-17
show further details.
Figure 18
a front view of the bracket linkage
Figure 19
a view from the direction A indicated in Figure 18

In Figur 1 ist eine zusammenfaltbare Steigleiter mit einknickbaren Sprossenstegen 3 mit je einem Mittelgelenk und in den Steigholmen eingebauten Sprossen-Endachsgelenken 6; 9 gezeigt, wobei die Faltbarkeit gewährleistet ist.In Figure 1 is a foldable ladder with foldable rung bars 3, each with a central joint and built in the riser rung end axis joints 6; 9 shown, the foldability is guaranteed.

In Figur 2 ist von Sprossensteg zu Sprossensteg 3 durch ein Schubgestänge 2 rechts und links die Einknickpunkte 7, 8 durch die Vernietung an den Gleichlauf der Sprossenbewegung gebunden, wobei der Achsschnittpunkt zum Schubgestängenietpunkt präzise veranlagt sein muß.In FIG. 2, the ratchet points 7, 8 are tied to the synchronism of the rungs movement from rungs to rungs 3 by a push rod 2 on the right and left, whereby the axis intersection with the push rod rivet must be precisely positioned.

Figur 1 ist die Leiter in Arbeitsstellung bei gestreckter Sprossenstellung 18 im 90°-Drehpunkt 4 im Mittelbereich der einknickbaren Sprossen durch die Distanzrollen 5 mit der Stufenstoßkante 14 zum Druckpunkt in der Endstellung verstärkend im Zusammenwirken der am Ende der Sprossen in den Holmen eingebauten Sprossen-Endachsgelenke 9 beim Einknickpunkt 7 fest sich verankernd eingebaut.Figure 1 is the ladder in the working position with extended rung position 18 in the 90 ° pivot point 4 in the central region of the foldable rungs by means of the spacer rollers 5 with the step butt edge 14 to the pressure point in the end position in cooperation with the rung end axis joints installed in the spars at the end of the rungs 9 installed at anchor point 7 firmly anchored.

In Figuren 3 und 4 ist die Leiter in der Ruhestellung als raumsparender kubisch wirkender Stab 17 erkennbar, hier ist bei 20 eine verschließende Arretierung oder auch Abschließbarkeit aufgezeigt. In 2 ist das Schubgestänge, bei 16 die Vernietbarkeit von Sprossensteg zu Sprossensteg aufgezeigt.In Figures 3 and 4, the ladder can be seen in the rest position as a space-saving, cubically acting rod 17, here 20 shows a locking lock or lockability. The push rod is shown in FIG. 2, and the rivetability from rung web to rung web is shown at 16.

Nach Figur 5 ist die Gebrauchsstellung der faltbaren Leiter im Bereich der untersten Sprosse mit Einklammerungsgestänge 21 über die Mittelhalterung 27 verankert, wobei mit 23 eine Abstützung für das Gestänge im Leiterfußsockel bezeichnet ist, welche Abstützung einrastet, womit die Gegenstrebung die Leiter standfest macht. Der Mitteldrehpunkt der Sprosse stabilisiert sich mittels Distanzrolle 5, die durch den Arretierungskernstift 30 allen Drehbewegungen freistehend bis zur Endpunktstellung 28 auffängt, wobei die als Querbolzen ausgebildete Mittelhalterung 27 die letztendliche Einrastung gewährleistet.According to FIG. 5, the position of use of the foldable ladder is anchored in the area of the bottom rung with brackets 21 by means of the middle bracket 27, 23 being a support for the linkage in the base of the ladder, which engages in support, whereby the counter-strut makes the ladder stable. The center pivot point of the rung is stabilized by means of a spacer roller 5 which, by means of the locking core pin 30, absorbs all rotary movements in a free-standing manner up to the end point position 28, the central bracket 27 designed as a cross bolt ensuring the final engagement.

In Figur 6 sind von oben gesehen bei 26 die zwischen den U-förmigen Holmen distanzgebenden Distanzscheiben eingebaut, bei 25 sind die Sprossen-Schubgestänge eingebaut, die dazu dienen, die Halbsprossenstege beidseitig gleichlaufend zu heben und zu senken, wobei in der gestreckten Form die Schubgestänge zum Abstützen aufsitzen, bei 12, 13 technisch aufgezeigt.In FIG. 6, seen from above, at 26 the spacers spacing the distance between the U-shaped bars are installed, at 25 the rung push rods are installed, which serve to raise and lower the half rung webs on both sides in the same direction, with the push rods in the elongated form sit on for support, technically shown at 12, 13.

Figur 7 zeigt die fast kubisch im Ausschnitt von oben gesehen geschlossene Leiter. Es ist der kompakte Teil mit der Distanzrolle 5 veranlagt, die der Stabilisierung dient; mit 25 sind die beweglichen Schubgestänge, die mittels der Distanzscheiben das Eingleiten in die Gegenholme möglich machen bezeichnet; der Rundmittelpunkt ist die Endarretierung, wie auch die gegeneinander geschobenen U-Holme von Figur 6 in Figur 7.Figure 7 shows the almost cubic closed section viewed from above. It is the compact part with the spacer roller 5, which serves for stabilization; 25 denotes the movable push rods which make it possible to slide into the counter spars by means of the spacers; the center point of the round is the final locking, as are the U-spars of FIG. 6 in FIG. 7 that are pushed against each other.

Die Figuren 8 - 17 zeigen weitere beispielhafte Ausführungsformen des Erfindungsgegenstandes.Figures 8-17 show further exemplary embodiments of the subject matter of the invention.

In Figur 8 und 9 sind mit 31 die Steigholme, mit 32 die einknickbaren Trittsprossen, mit 33 das versetzt angebrachte Schubgestänge, mit 34 sind die präzise von Sprossensteg zu Sprossensteg fixierten Gelenknieten für die gleichmäßige Schubbewegung der Sprossen bezeichnet, mit 35 sind die der Schubgestänge angepaßten Distanzringe an der von 31 und 32 verbindende Achse 39 wie auch bei 36 Distanzringe für den Sprossenversatz angebracht sind, unter 37 ist eine tragende Distanzrolle, mit 38 ist die Sprossen verbindende Achse eingesetzt, unter 39 sind die Sprossen mit den Steigholmen mittels Achse 9 mit den Distanzrollen in vorbedachte überlaschende Position verankert, bei 40 die Trittsprossen verbundenen Schubgestänge die über den vorgesehenen 90°-Drehpunkt punktuell den Gleichlauf in die Auf- und Abbewegung gewährleisten, wobei im Endschließpunkt die Schubgestänge gegenseitig wie in Figur 10 bei 33 ersichtlich beidseitig in die Steigholme kurz eintauchen, unter 41 ist bei der gestreckten Sprosse eine Arretierung veranlagt, damit ist auch die Stabilisierung der stabförmigen Leiter als geschlossene Leiter aufgezeigt.In FIGS. 8 and 9, the risers are at 31, the stepping rungs are foldable at 32, the push rods are offset at 33, and at 34 they are precise from rung web to rung web fixed joint rivets for the uniform pushing movement of the rungs, with 35 the spacer rings adapted to the push rod are attached to the axis connecting 31 and 32 39 as well as 36 spacer rings for the rung offset, under 37 is a load-bearing spacer roller, with 38 is the rungs connecting axis inserted, under 39 the rungs with the risers are anchored by means of axis 9 with the spacer rollers in a pre-planned, surprising position, at 40 the connecting rods connected to the step bars guarantee the synchronism in the up and down movement via the intended 90 ° pivot point, whereby At the final closing point, briefly immerse the push rods on both sides of the riser on both sides, as shown in Figure 10 at 33, under 41 there is a lock on the straight rung, which also shows the stabilization of the rod-shaped ladder as a closed ladder.

Figur 18 und Figur 19 zeigen das Einklammerungsgestänge 21 in einer weiteren bevorzugten Ausführungsform.Figure 18 and Figure 19 show the bracket linkage 21 in a further preferred embodiment.

Das Einklammerungsgestänge 21 weist an seinen Enden bogenförmige Klauen 50 auf, die die Achsrolle 5 im ausgeklappten Zustand umgreifen. Dabei greifen die Einrastnasen 51 jedes Einklammerungsgestängeteils 21 in die Aussparung 22 der Achsrolle 5 ein.
Die Achsrolle 5 wird dabei so geführt, daß die Aussparung 52 im ausgeklappten Zustand exakt über den Einrastnasen 51 besteht.The clamping linkage 21 has at its ends arc-shaped claws 50 which grip around the axle roller 5 in the unfolded state. The latching lugs 51 of each clamping rod part 21 engage in the recess 22 of the axle roller 5.
The axle roller 5 is guided so that the recess 52 is exactly over the locking lugs 51 in the unfolded state.

Die Größe der Aussparung 52 ist dabei geringer wie die Außenmaße der Einrastnasen 51, so daß beim Ausklappen der Leiter die Einrastnasen 51 in die Aussparung 42 eingedrückt werden müssen und somit eine festhaltende Verbindung entsteht.The size of the recess 52 is smaller than the outer dimensions of the latching lugs 51, so that when the conductors are folded out, the latching lugs 51 must be pressed into the recess 42 and thus a firm connection is created.

Claims (6)

  1. Foldable ladder with foldable rungs (3), each having a 90°-pivot (4) around the middle, the rungs (3) being installed also turnable about 90° through rung-joints (9) at the ends of the axis of the rungs (3) in the beams (1),
    characterized in that
    a push-linkage (2) at the right and the left of each rung (3) linking the rungs (3) in a distance from the rung-joint (9) at the end of the axis of the rung (3) is installed in the beams (1) which are formed as rails.
  2. Foldable ladder according to claim 1,
    characterized in that
    the beams (1) are riveted into each rung (3) in a distance from the rung-joint (6) at the end of the axis of the rung (3).
  3. Foldable ladder according to claim 1 or 2,
    characterized in that
    the supporting points in the middle of the beams adapt themselves exactly by resting through distance-rollers (5), stabilizing at the edge of the step and that the final point of touching pressure is located in the beam at the folding-point (7) of the rung-joints at the ends of the axis of the rungs.
  4. Foldable ladder according to one of the claims 1 to 3,
    characterized in that
    the ladder is laterally foldable to a cubic bar (17) and that finally the ladder may be locked to a bar by locking means.
  5. Foldable ladder according to one of the claims 1 to 4,
    characterized in that
    the unfolding of the flanks especially in the lowest rung (3) engages at the middle support by means of the bracket-linkage (21) through the middle support (27) in the distance-roller (5), the position of the end-point (28) fixing the distance-point to the locking-pin (30) against distortion.
  6. Foldable ladder according to one of the preceeding claims,
    characterized in that
    the bracket-linkage (21) has arched clutches (5) at its ends and at each part of the bracket-linkage (21) an engaging nose (51) is disposed which is in the unfolded state pressed in a recess (52) of the distance-roller (5).
EP88115651A 1987-10-06 1988-09-23 Folding ladder Expired - Lifetime EP0310884B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88115651T ATE75293T1 (en) 1987-10-06 1988-09-23 FOLDABLE LADDERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733702 1987-10-06
DE19873733702 DE3733702A1 (en) 1987-10-06 1987-10-06 FOLDABLE LIFTING LADDER

Publications (2)

Publication Number Publication Date
EP0310884A1 EP0310884A1 (en) 1989-04-12
EP0310884B1 true EP0310884B1 (en) 1992-04-22

Family

ID=6337688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115651A Expired - Lifetime EP0310884B1 (en) 1987-10-06 1988-09-23 Folding ladder

Country Status (9)

Country Link
US (1) US4842099A (en)
EP (1) EP0310884B1 (en)
JP (1) JPH01239287A (en)
KR (1) KR890006949A (en)
AT (1) ATE75293T1 (en)
AU (1) AU615480B2 (en)
CA (1) CA1296688C (en)
DE (2) DE3733702A1 (en)
ES (1) ES2032918T3 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158151A (en) * 1992-01-21 1992-10-27 Chang Wan Li Bidirectionally foldable step ladder
US5195610A (en) * 1992-05-04 1993-03-23 Wan Li Chang Bidirectionally foldable step ladder
CH686317A5 (en) * 1992-05-08 1996-02-29 Wan Li Chang Locking device for bidirectionally foldable step ladders
AU667980B2 (en) * 1992-11-26 1996-04-18 Michael Mulawa Toy surfing device
DE9406506U1 (en) * 1994-04-19 1995-08-17 Kunz, Markus, 66646 Marpingen Stairs, especially attic stairs
US6536558B2 (en) 2001-02-16 2003-03-25 Harold E. Price Folding ladder
FR2928393B1 (en) * 2008-03-07 2015-07-24 Larbaletier FOLDABLE OBSERVATION PLATFORM AND MOUNTING METHOD
CN112572562B (en) * 2020-12-05 2021-11-23 乐山职业技术学院 Book transfer device

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US610284A (en) * 1898-09-06 schubert
US958732A (en) * 1908-03-06 1910-05-24 Dennis Novelty Ladder Company Ladder.
GB191010778A (en) * 1910-05-02 1910-09-15 Flora Williams Smith Improvements in Foldable Ladders.
US1371125A (en) * 1918-01-05 1921-03-08 Jr Herman Frank Speckman Folding ladder
US2670120A (en) * 1949-05-16 1954-02-23 Sanguineti Emanuele Collapsible ladder, double ladder, and stepladder
FR1139461A (en) * 1955-12-02 1957-07-01 articulated ladder
US2981364A (en) * 1959-07-13 1961-04-25 Webber Jack Folding ladder
BE587304A (en) * 1959-10-21 1960-05-30 Battista Lamberti Ladder with elements that can be folded over one another.
US3084760A (en) * 1960-01-18 1963-04-09 Lamberti Battista Stepladder with folding elements
AT239066B (en) * 1963-05-16 1965-03-10 Johann Tretina Ladder that can be used as a leaning or step ladder
FR1403008A (en) * 1964-04-27 1965-06-18 Improvements to ladders and similar portable stairs
FR2428138A1 (en) * 1978-06-09 1980-01-04 Stoltz Gerard Folding ladders with articulated rings - has rod connecting rung joints and resting against apex of trestle-shaped support
DE3320519A1 (en) * 1983-06-07 1984-12-13 Karl 4400 Münster Kemper Folding ladder
US4560030A (en) * 1984-05-04 1985-12-24 Metarplastic S.P.A. Folding ladder
IT8552842V0 (en) * 1985-01-14 1985-01-14 Pro Cord Srl THREE-POST FOLDING PADLOCK

Also Published As

Publication number Publication date
ES2032918T3 (en) 1993-03-01
CA1296688C (en) 1992-03-03
JPH01239287A (en) 1989-09-25
US4842099A (en) 1989-06-27
DE3870386D1 (en) 1992-05-27
AU2340688A (en) 1989-04-06
KR890006949A (en) 1989-06-17
EP0310884A1 (en) 1989-04-12
AU615480B2 (en) 1991-10-03
ATE75293T1 (en) 1992-05-15
DE3733702C2 (en) 1990-10-31
DE3733702A1 (en) 1989-05-03

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