EP0002549A1 - Multiple purpose collapsible ladder - Google Patents

Multiple purpose collapsible ladder Download PDF

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Publication number
EP0002549A1
EP0002549A1 EP78200336A EP78200336A EP0002549A1 EP 0002549 A1 EP0002549 A1 EP 0002549A1 EP 78200336 A EP78200336 A EP 78200336A EP 78200336 A EP78200336 A EP 78200336A EP 0002549 A1 EP0002549 A1 EP 0002549A1
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EP
European Patent Office
Prior art keywords
ladder
release lever
joint
hinge
lever
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Withdrawn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
EP78200336A
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German (de)
French (fr)
Inventor
Wilhelm Bahmüller
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.)
BAHMUELLER MASCH W
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
Original Assignee
BAHMUELLER MASCH W
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
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Publication date
Application filed by BAHMUELLER MASCH W, Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH filed Critical BAHMUELLER MASCH W
Publication of EP0002549A1 publication Critical patent/EP0002549A1/en
Withdrawn legal-status Critical Current

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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
    • E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic

Definitions

  • the invention relates to a collapsible multi-purpose ladder, the spars of which are connected by a joint which can be locked in several working positions and which has two joint parts which can be pivoted about a common joint axis, of which the first joint part has a double-shell locking disk which is concentric with the joint axis and which corresponds in area to its circumference Working positions distributed open-edge recesses into which a spring-loaded locking piece can be guided, which can be moved longitudinally on the second joint part and can be lifted out of the respective recess of the locking disk by a release lever pivotably mounted on the second joint part and connected to an actuating lever, preferably one in the joint spring-loaded holding part is arranged, by means of which, depending on the respective mutual angular position of the two joint parts, the release lever locks automatically in the position corresponding to the raised blocking piece is adjustable and which can be brought out of engagement with the release lever automatically by pivoting one of the two hinge parts about the hinge axis.
  • the object of the invention is therefore to facilitate the unlocking of the joints for the user of the multi-purpose ladder.
  • This object is achieved in that the release levers of the joints assigned to the two ladder stiles are connected to one another by an axially passing through a hollow ladder rung, which can be rotated by a single actuating lever arranged outside the one stile.
  • the arrangement according to the invention makes it possible to unlock the two joints belonging to one another simultaneously and together when the position of the ladder is to be changed by means of a single actuating lever which is arranged on the outside of one of the ladder stiles.
  • FIG. 1 shows a multipurpose ladder according to the invention in a perspective view
  • FIG. 2 shows the two joint parts of a joint used in the multipurpose ladder according to the invention in a section made parallel to the outer surface of the joint parts
  • FIG. 3 shows the joint part containing the actuating lever in one with a Rung in one axially through the rung and parallel to the side surfaces of the hinge part performed section
  • Figure 4 the other joint part in the same representation.
  • the multipurpose ladder 1 shown in FIG. 1 has at its upper end two joints 2 and 2a, which become effective when, as is usually the case, it is used as a fixed ladder. Approximately in the middle of the two mutually pivotable conductor parts 3 and 4, further joints 5 and 5a, and 6 and 6a are provided. These make it possible to use the ladder as an assembly platform. All joints are designed in a known manner such that they can be locked in several working positions, so that the required security is given for each of the working positions.
  • the joints are constructed in a known manner in such a way that the first joint part 7 (FIG. 2), which can be pivoted about the common axis 9 with the second joint part 8, carries a locking disk consisting of two shells, which is circular over part of its circumference and of which only the rear shell 10 is shown in FIG.
  • the locking disk has, according to the working positions of the conductors, peripherally open recesses 11 distributed in its circumference, into which a locking piece 12 can engage, which is guided in a longitudinally displaceable manner on the articulated part 8 and is under the action of a spring 13a, which strives to block the locking piece 12 to press against the locking disc.
  • a release lever 13 In order to lift the locking piece 12 out of the respective recess 11, a release lever 13 is used in a known manner, which engages with a bolt 14 extending at right angles from it at its rear end into an open longitudinal slot 15 of an adjusting lever 16. This has at its other end an elongated hole 17 through which a flat section 18 one Shaft 19 is inserted.
  • the shaft 19 passes through a hollow rung 20 of the ladder. It has flat sections 18 of the aforementioned type at its two ends, each of which cooperates with one of the joints 2 or 2a, 5 or 5a and 6 or 6a assigned to each of the ladder stiles.
  • an actuating lever 21 is attached at one end of the shaft 19, which is also the end of its one flat section 18, at one end of its one flat section 18, an actuating lever 21 is attached.
  • This has a cylindrical extension 22 inside, with which it is rotatably mounted in a cylindrical sleeve 23, which in turn is fastened with a square outer surface at the end of the square rung 20.
  • a round end piece 24 is attached to the flat section, which also has an inwardly facing cylindrical projection 25 which is mounted on a sleeve 26 which sits with its square outer surface in the square rung 20.
  • the bearing for the actuating lever 21 and the end piece 24 thus also forms the bearing for the shaft 19.
  • the release levers 13 of two joints 2 or 2a, 5 or 5a or 6 or 6a assigned to a spar on both sides of the ladder can be removed simultaneously and together from the respective recess the lock washers are lifted in order to be able to move the ladder into another position.
  • the actuating lever 21 is pivoted, the locking of the two joints forming a pair is accordingly released.
  • the invention is advantageously used in such joints in which a spring-loaded holding part is arranged in the joint, by means of which, depending on the respective mutual angular position of the two joint parts, the release lever can be temporarily automatically locked in the position corresponding to the raised blocking piece.
  • the holding part is automatically brought out of engagement with the release lever by pivoting one of the two hinge parts about the hinge axis.
  • the shaft connecting the two release levers is arranged within a hollow ladder rung, the shaft is protected against external, harmful influences and also does not impair the exterior of the multipurpose ladder.

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  • Ladders (AREA)

Abstract

In a multiple purpose collapsible ladder whose side rails are connected by in each case one articulation (2, 2a; 5, 5a; 6, 6a) lockable into a plurality of working positions, which articulation has two hinge parts swivellable about a common articulation axis, of which the first hinge part has a double-shell blocking disc which is concentric to the articulation axis and which carries recesses open at the edge which are distributed in the region of its periphery and correspond to the working positions, into which recesses a spring- loaded blocking piece guided longitudinally displaceably on the second hinge part can engage, which piece can be lifted out of the particular recess of the blocking disc by means of a release lever swivellably mounted on the second hinge part and connected to an actuating lever (21), in each of the articulations (2, 2a; 5, 5a; 6, 6a) a spring- loaded holding part is preferably arranged, by means of which the release lever is momentarily automatically lockable in the position corresponding to the lifted-out blocking piece as a function of the particular mutual angular position of the two hinge parts and which can be automatically brought out of engagement with the release lever by swivelling one of the two hinge parts about the articulation axis. In order to facilitate the unlocking of the articulations for the user of the ladder, the release levers of the articulations (2, 2a; 5, 5a; 6, 6a) assigned to the two side rails of the ladder can be connected together by means of a shaft passing axially through a hollow rung (20), which shaft can be rotated by a single actuating lever (21) arranged on the outside of one side rail. <IMAGE>

Description

Die Erfindung betrifft eine zusammenklappbare Mehrzweckleiter, deren Holne durch je ein in mehreren Arbeitsstellungen verriegelbares Gelenk verbunden sind, das zwei um eine gemeinsame Gelenkachse schwenkbare Gelenkteile aufweist, von denen der erste Gelenkteil eine zur Gelenkachse konzentrische zweischalige Sperrscheibe aufweist, die im Bereiche ihres Umfanges entsprechend den Arbeitsstellungen verteilte randoffene Ausnehmungen trägt, in die ein an dem zweiten Gelenkteil längsverschieblich geführtes federbelastetes Sperrstück eingreifen kann, das durch einen an dem zweiten Gelenkteil verschwenkbar gelagerten und mit einem Betätigungshebel verbundenen Lösehebel aus der jeweiligen Ausnehmung der Sperrscheibe aushebbar ist, wobei in dem Gelenk vorzugsweise ein federbelasteter Halteteil angeordnet ist, durch den abhängig von der jeweiligen gegenseitigen Winkellage der beiden Gelenkteile der Lösehebel in der dem ausgehobenen Sperrstück entsprechenden Stellung vorübergehend selbsttätig verriegelbar ist und der durch Verschwenkung eines der beiden Gelenkteile um die Gelenkachse selbsttätig außer Eingriff mit dem Lösehebel bringbar ist.The invention relates to a collapsible multi-purpose ladder, the spars of which are connected by a joint which can be locked in several working positions and which has two joint parts which can be pivoted about a common joint axis, of which the first joint part has a double-shell locking disk which is concentric with the joint axis and which corresponds in area to its circumference Working positions distributed open-edge recesses into which a spring-loaded locking piece can be guided, which can be moved longitudinally on the second joint part and can be lifted out of the respective recess of the locking disk by a release lever pivotably mounted on the second joint part and connected to an actuating lever, preferably one in the joint spring-loaded holding part is arranged, by means of which, depending on the respective mutual angular position of the two joint parts, the release lever locks automatically in the position corresponding to the raised blocking piece is adjustable and which can be brought out of engagement with the release lever automatically by pivoting one of the two hinge parts about the hinge axis.

Bei bekannten Mehrzweckleitern der obengenannten Art, die Gelenke aufweisen, wie sie z.B. aus der DT-OS 2 514 940 bekannt geworuel. sinc, besteht dieIn known multi-purpose conductors of the type mentioned above, which have joints, as they have become known, for example, from DT-OS 2 514 940. sinc, there is

Notwendigkeit, vor der Überführung der Leiter in eine andere Stellung jedes der einem Leiterholm zugeordneten Gelenke durch einen Betätigungshebel außen an jedem der Holme zu entriegeln. Das ist verhältnismäßig umständlich.Need to unlock each of the joints associated with a ladder stile by an operating lever on the outside of each of the stiles before moving the ladder to a different position. This is relatively cumbersome.

Aufgabe der Erfindung ist es daher, die Entriegelung der Gelenke für den Benutzer der Mehrzweckleiter zu erleichtern. Diese Aufgabe wird gelöst, indem die Lösehebel der den beiden Leiterholmen zugeordneten Gelenke durch eine axial durch eine hohle Leitersprosse hindurchgehenden Welle miteinander verbunden sind, die durch einen einzigen, außerhalb des einen Holmes angeordneten Betätigungshebel verdrehbar ist.The object of the invention is therefore to facilitate the unlocking of the joints for the user of the multi-purpose ladder. This object is achieved in that the release levers of the joints assigned to the two ladder stiles are connected to one another by an axially passing through a hollow ladder rung, which can be rotated by a single actuating lever arranged outside the one stile.

Durch die Anordnung gemäß der Erfindung ist es möglich, nunmehr durch einen einzigen Betätigungshebel, der außen an einem der Leiterholme angeordnet ist, die beiden zueinander gehörigen Gelenke gleichzeitig und gemeinsam zu entriegeln, wenn die Stellung der Leiter verändert werden soll.The arrangement according to the invention makes it possible to unlock the two joints belonging to one another simultaneously and together when the position of the ladder is to be changed by means of a single actuating lever which is arranged on the outside of one of the ladder stiles.

In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Es zeigt Figur 1 eine Mehrzweckleiter gemäß der Erfindung in perspektivischer Darstellung, Figur 2 die beiden Gelenkteile eines bei der Mehrzweckleiter gemäß der Erfindung zur Verwendung kommenden Gelenkes in einem parallel zur Außenfläche der Gelenkteile geführten Schnitt, Figur 3 den den Betätigungshebel enthaltenden Gelenkteil in einem mit einer Sprosse in einem axial durch die Sprosse und parallel zu den Seitenflächen des Gelenkteils geführten Schnitt und Figur 4 den anderen Gelenkteil in der gleichen Darstellungsart.In the drawing, an embodiment of the object of the invention is shown. 1 shows a multipurpose ladder according to the invention in a perspective view, FIG. 2 shows the two joint parts of a joint used in the multipurpose ladder according to the invention in a section made parallel to the outer surface of the joint parts, FIG. 3 shows the joint part containing the actuating lever in one with a Rung in one axially through the rung and parallel to the side surfaces of the hinge part performed section and Figure 4 the other joint part in the same representation.

Die in Figur 1 dargestellte Mehrzweckleiter 1 weist an ihrem oberen Ende zwei Gelenke 2 und 2a auf, die wirksam werden, wenn sie, wie meistens, als Bockleiter verwendet wird. Etwa in der Mitte der beiden gegeneinander verschwenkbaren Leiterteile 3 und 4 sind weitere Gelenke 5 und 5a, sowie 6 und 6a vorgesehen. Diese ermöglichen es, die Leiter auch als Montagebühne zu verwenden. Sämtliche Gelenke sind in bekannter Weise derart ausgebildet, daß sie in mehreren Arbeitsstellungen verriegelbar sind, damit für jede der Arbeitsstellungen die gebotene Sicherheit gegeben ist.The multipurpose ladder 1 shown in FIG. 1 has at its upper end two joints 2 and 2a, which become effective when, as is usually the case, it is used as a fixed ladder. Approximately in the middle of the two mutually pivotable conductor parts 3 and 4, further joints 5 and 5a, and 6 and 6a are provided. These make it possible to use the ladder as an assembly platform. All joints are designed in a known manner such that they can be locked in several working positions, so that the required security is given for each of the working positions.

Die Gelenke sind im einzelnen in bekannter Weise derart aufgebaut, daß der erste Gelenkteil 7 (Figur 2), der mit dem zweiten Gelenkteil 8 um die gemeinsame Achse 9 verschwenkbar ist, eine aus zwei Schalen bestehende Sperrscheibe trägt, die über einen Teil ihres Umfanges kreisrund ist und von der in Figur 2 nur die hintere Schale 10 dargestellt ist. Die Sperrscheibe weist entsprechend den Arbeitsstellungen der Leiter an ihrem Umfang verteilte, randoffene Ausnehmungen 11 auf, in die ein Sperrstück 12 eingreifen kann, das an dem Gelenkteil 8 längsverschieblich geführt ist und unter der Wirkung einer Feder 13a steht, die bestrebt ist, das Sperrstück 12 gegen die Sperrscheibe zu drücken. Zum Ausheben des Sperrstückes 12 aus der jeweiligen Ausnehmung 11 dient in bekannter Weise ein Lösehebel 13, der mit einem rechtwinklig von ihm ausgehenden Bolzen 14 an seinem hinteren Ende in einen offenen Längsschlitz 15 eines Verstellhebels 16 eingreift. Dieser weist an seinem anderen Ende ein Langloch 17 auf, durch welches ein flacher Abschnitt 18 einer Welle 19 hindurchgesteckt ist. Die Welle 19 geht durch eine hohle Sprosse 20 der Leiter hindurch. Sie weist an ihren beiden Enden flache Abschnitte 18 der vorgenannten Art auf, die jeweils mit einem der jedem der Leiterholme zugeordneten Gelenke 2 bzw. 2a, 5 bzw. 5a und 6 bzw. 6a zusammenwirken.The joints are constructed in a known manner in such a way that the first joint part 7 (FIG. 2), which can be pivoted about the common axis 9 with the second joint part 8, carries a locking disk consisting of two shells, which is circular over part of its circumference and of which only the rear shell 10 is shown in FIG. The locking disk has, according to the working positions of the conductors, peripherally open recesses 11 distributed in its circumference, into which a locking piece 12 can engage, which is guided in a longitudinally displaceable manner on the articulated part 8 and is under the action of a spring 13a, which strives to block the locking piece 12 to press against the locking disc. In order to lift the locking piece 12 out of the respective recess 11, a release lever 13 is used in a known manner, which engages with a bolt 14 extending at right angles from it at its rear end into an open longitudinal slot 15 of an adjusting lever 16. This has at its other end an elongated hole 17 through which a flat section 18 one Shaft 19 is inserted. The shaft 19 passes through a hollow rung 20 of the ladder. It has flat sections 18 of the aforementioned type at its two ends, each of which cooperates with one of the joints 2 or 2a, 5 or 5a and 6 or 6a assigned to each of the ladder stiles.

An dem einen Ende der Welle 19, das zugleich auch das Ende ihres einen flachen Abschnitts 18 ist, ist ein Betätigungshebel 21 befestigt. Dieser weist innen einen zylindrischen Ansatz 22 auf, mit der er in einer zylindrischen Hülse 23 drehbar gelagert ist, die ihrerseits mit einer vierkantigen Außenfläche am Ende der vierkantigen Sprosse 20 befestigt ist. Am anderen Ende der Welle 19 ist auf dem flachen Abschnitt ein rundes Schlußstück 24 befestigt, das ebenfalls einen nach innen weisenden zylindrischen Ansatz 25 aufweist, der an einer Hülse 26 gelagert ist, die mit ihrer vierkantigen Außenfläche in der vierkantigen Leitersprosse 20 sitzt. Die Lagerung für den Betätigungshebel 21 und das Schlußstück 24 bildet damit gleichzeitig auch die Lagerung für die Welle 19.At one end of the shaft 19, which is also the end of its one flat section 18, an actuating lever 21 is attached. This has a cylindrical extension 22 inside, with which it is rotatably mounted in a cylindrical sleeve 23, which in turn is fastened with a square outer surface at the end of the square rung 20. At the other end of the shaft 19, a round end piece 24 is attached to the flat section, which also has an inwardly facing cylindrical projection 25 which is mounted on a sleeve 26 which sits with its square outer surface in the square rung 20. The bearing for the actuating lever 21 and the end piece 24 thus also forms the bearing for the shaft 19.

Mittels des Betätigungshebels 21 können somit durch Vermittlung der Welle 19 und der Verstellhebel 16 gleichzeitig und gemeinsam die Lösehebel 13 zweier auf beiden Seiten der Leiter jeweils einem Holm zugeordneter Gelenke 2 bzw. 2a, 5 bzw. 5a oder 6 bzw. 6a aus der jeweiligen Ausnehmung der Sperrscheiben ausgehoben werden, um die Leiter in eine andere Stellung überführen zu können. Bei dem Verschwenken des Betätigungshebels 21 wird demgemäß die Verriegelung der beiden jeweils ein Paar bildenden Gelenke aufgehoben.By means of the actuating lever 21, by means of the shaft 19 and the adjusting lever 16, the release levers 13 of two joints 2 or 2a, 5 or 5a or 6 or 6a assigned to a spar on both sides of the ladder can be removed simultaneously and together from the respective recess the lock washers are lifted in order to be able to move the ladder into another position. When the actuating lever 21 is pivoted, the locking of the two joints forming a pair is accordingly released.

Die Erfindung wird mit Vorteil bei solchen Gelenken verwendet, bei denen in dem Gelenk ein federbelasteter Halteteil angeordnet ist, durch den, abhängig von den der jeweiligen gegenseitigen Winkellage der beiden Gelenkteile, der Lösehebel in der dem ausgehobenen Sperrstück entsprechenden Stellung vorübergehend selbsttätig verriegelbar ist. Der Halteteil ist hierbei durch Verschwenkung eines der beiden Gelenkteile um die Gelenkachse selbsttätig außer Eingriff mit dem Lösehebel zu bringen.The invention is advantageously used in such joints in which a spring-loaded holding part is arranged in the joint, by means of which, depending on the respective mutual angular position of the two joint parts, the release lever can be temporarily automatically locked in the position corresponding to the raised blocking piece. The holding part is automatically brought out of engagement with the release lever by pivoting one of the two hinge parts about the hinge axis.

Dadurch, daß die die beiden Lösehebel verbindende Welle innerhalb einer hohlen Leitersprosse angeordnet ist, ist die Welle gegen äußere, schädliche Einflüsse geschützt und beeinträchtigt zudem nicht das Äußere der Mehrzweckleiter.Because the shaft connecting the two release levers is arranged within a hollow ladder rung, the shaft is protected against external, harmful influences and also does not impair the exterior of the multipurpose ladder.

Claims (2)

1. Zusammenklappbare Mehrzweckleiter, deren Holme durch je ein in mehreren Arbeitsstellungen verriegelbares Gelenk verbunden sind, das zwei um eine gemeinsame Gelenkachse schwenkbare Gelenkteile aufweist, von denen der erste Gelenkteil eine zur Gelenkachse konzentrische zweischalige Sperrscheibe aufweist, die im Bereiche ihres Umfanges entsprechend den Arbeitsstellungen verteilte randoffene Ausnehmungen trägt, in die ein an dem zweiten Gelenkteil längsverschieblich geführtes federbelastetes Sperrstück eingreifen kann, das durch einen an dem zweiten Gelenkteil verschwenkbar gelagerten und mit einem Betätigungshebel verbundenen Lösehebel aus der jeweiligen Ausnehmung der Sperrscheibe aushebbar ist, wobei in dem Gelenk vorzugsweise ein federbelasteter Halteteil angeordnet ist, durch den abhängig von der jeweiligen gegenseitigen Winkellage der beiden Gelenkteile der Lösehebel in der dem ausgehobenen Sperrstück entsprechenden Stellung vorübergehend selbsttätig verriegelbar ist und der durch Verschwenkung eines der beiden Gelenkteile um die Gelenkachse selbsttätig außer Eingriff mit dem Lösehebel bringbar ist, dadurch gekennzeichnet, daß die Lösehebel (13) der den beiden Leiterholmen zugeordneten Gelenke (2, 2a; 5, 5a; 6, 6a) durch eine axial durch eine hohle Leitersprosse (20) hindurchgehende Welle (19) miteinander verbunden sind, die durch einen einzigen außerhalb des einen Holmes angeordneten Betätigungshebel (21) verdrehbar ist.1. Z usammenklappbare multipurpose ladder, the stiles are connected by a respective lockable in several positions joint having two pivotable about a common axis of articulation joint parts, of which the first hinge portion has a concentric to the hinge axis bivalve locking disc which in the region of its circumference according to the working positions distributed edge-open recesses, into which a spring-loaded locking piece guided in a longitudinally displaceable manner can engage, which can be lifted out of the respective recess of the locking disk by a release lever pivotably mounted on the second joint part and connected to an actuating lever, preferably a spring-loaded one in the joint Holding part is arranged, by which depending on the respective mutual angular position of the two hinge parts of the release lever in the position corresponding to the raised blocking piece can be temporarily locked automatically and the durc h pivoting of one of the two joint parts about the joint axis can be brought out of engagement with the release lever automatically, characterized in that the release lever (13) of the joints (2, 2a; 5, 5a; 6, 6a) are connected to one another by a shaft (19) which passes axially through a hollow rung (20) and can be rotated by a single actuating lever (21) arranged outside the one spar. 2. Mehrzweckleiter nach Patentanspruch 1, dadurch gekennzeichnet, daß die Leiter (1) mehrere jeweils über eine durch eine hohle Leitersprosse (21) hindurchgehende Welle (19) verbundene Gelenkpaare (2, 2a; 5, 5a; 6, 6a) aufweist.2. Multi-purpose ladder according to claim 1, characterized in that the ladder (1) has a plurality of pairs of joints (2, 2a; 5, 5a; 6, 6a) each connected via a shaft (19) passing through a hollow ladder rung (21).
EP78200336A 1977-12-08 1978-12-04 Multiple purpose collapsible ladder Withdrawn EP0002549A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2754755 1977-12-08
DE19772754755 DE2754755C2 (en) 1977-12-08 1977-12-08 Multipurpose foldable ladder

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EP0002549A1 true EP0002549A1 (en) 1979-06-27

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP0609523A1 (en) * 1993-01-26 1994-08-10 HYMER LEICHTMETALLBAU GmbH & Co. KG Hinge for step-ladder
AU2006203042B2 (en) * 2005-07-20 2011-12-15 Werner Co Australia Pty Ltd Improved latching means for a combination step and extension ladder
CN115538916A (en) * 2022-10-28 2022-12-30 四川华能康定水电有限责任公司 Hand-operated elevator
EP4107357A4 (en) * 2020-02-20 2024-03-13 Little Giant Ladder Systems, LLC Ladders and hinge for ladders

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DE3211164C2 (en) * 1982-03-26 1985-06-20 Günther 6320 Alsfeld Krause Multipurpose foldable ladder
DE3446255A1 (en) * 1984-12-19 1986-06-19 Nikolaus Adalbert 7730 Villingen-Schwenningen Kümmerlin Ladder

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DE1962648A1 (en) * 1969-03-17 1970-10-01 Western Electric Co Microwave quadrature coupler
DE2052584A1 (en) * 1970-10-27 1972-05-10 Hoffmann, Helmut, Hoffmann, Walter, 7151 Burgstall Multipurpose foldable ladder
DE2634752A1 (en) * 1976-08-02 1978-02-09 Loh Kg Hailo Werk Universal multipart folding ladder locking hinge - has connecting rod linking paired stop levers for simultaneous lock or release

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DE2514940C2 (en) * 1975-04-05 1985-03-07 Wilhelm Bahmüller Maschinen- und Apparatebau, 7067 Plüderhausen Joint that can be locked in several working positions to connect the ladder stiles to a ladder that can be locked in several positions or the like.

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Publication number Priority date Publication date Assignee Title
CH321050A (en) * 1954-11-24 1957-04-30 Ulrich Alfred Transformable ladder
FR1314063A (en) * 1961-12-20 1963-01-04 transformable ladder
DE1962648A1 (en) * 1969-03-17 1970-10-01 Western Electric Co Microwave quadrature coupler
DE2052584A1 (en) * 1970-10-27 1972-05-10 Hoffmann, Helmut, Hoffmann, Walter, 7151 Burgstall Multipurpose foldable ladder
DE2634752A1 (en) * 1976-08-02 1978-02-09 Loh Kg Hailo Werk Universal multipart folding ladder locking hinge - has connecting rod linking paired stop levers for simultaneous lock or release

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0609523A1 (en) * 1993-01-26 1994-08-10 HYMER LEICHTMETALLBAU GmbH & Co. KG Hinge for step-ladder
AU2006203042B2 (en) * 2005-07-20 2011-12-15 Werner Co Australia Pty Ltd Improved latching means for a combination step and extension ladder
EP4107357A4 (en) * 2020-02-20 2024-03-13 Little Giant Ladder Systems, LLC Ladders and hinge for ladders
CN115538916A (en) * 2022-10-28 2022-12-30 四川华能康定水电有限责任公司 Hand-operated elevator

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DE2754755C2 (en) 1986-10-02
DE2754755A1 (en) 1979-06-13

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