EP4405557B1 - Échelle portable comportant un dispositif de recul - Google Patents

Échelle portable comportant un dispositif de recul

Info

Publication number
EP4405557B1
EP4405557B1 EP22793420.5A EP22793420A EP4405557B1 EP 4405557 B1 EP4405557 B1 EP 4405557B1 EP 22793420 A EP22793420 A EP 22793420A EP 4405557 B1 EP4405557 B1 EP 4405557B1
Authority
EP
European Patent Office
Prior art keywords
ladder
assembly
arms
spreader
ladder assembly
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.)
Active
Application number
EP22793420.5A
Other languages
German (de)
English (en)
Other versions
EP4405557A1 (fr
EP4405557C0 (fr
Inventor
Caspar Bernard Lampe
Marcel Cornelis HOOIVELD
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.)
LAMPE HOLDING BV
Original Assignee
LAMPE HOLDING BV
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 LAMPE HOLDING BV filed Critical LAMPE HOLDING BV
Publication of EP4405557A1 publication Critical patent/EP4405557A1/fr
Application granted granted Critical
Publication of EP4405557B1 publication Critical patent/EP4405557B1/fr
Publication of EP4405557C0 publication Critical patent/EP4405557C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • E06C1/14—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
    • 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
    • E06C1/125—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/48—Ladder heads; Supports for heads of ladders for resting against objects
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/50—Joints or other connecting parts
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/14—Holders for pails or other equipment on or for ladders

Definitions

  • the present invention relates to a telescopic A-frame ladder.
  • A-frame ladders are self-supporting ladders, meaning they do not need to be leaned against a wall or other structure for stability.
  • A-frame ladders can be set up in an inverted V-shaped configuration, in which the ladder is free standing.
  • A-frame ladders can also be set up into a straight configuration, in which the two ladders are folded against each other, and in which the ladder is setup against a vertical surface, e.g. a wall.
  • A-frame ladders typically comprises a ladder and a frame, wherein the frame is hingedly connected to the ladder.
  • the frame is configured to fit the ladder, when in the straight configuration, enabling the frame to be positioned closely against, and partially receive, the ladder, providing a compact configuration.
  • the Ladder can be set up against a wall surface when in the straight configuration.
  • A-frame ladders that comprise two ladders, instead of a ladder and a frame, are also known. These ladders typically only allow for a set up in the A-configuration. In the straight configuration, the ladders are positioned adjacent to each other, which does not allow for the compact configuration that can be attained with an A-ladder comprising a frame.
  • telescopic A-frame ladders are known, i.e. A-frame ladders comprising two telescopic ladder assemblies.
  • the telescopic ladder assemblies have multiple ladder sections, each ladder section comprising two tubular stile members arranged parallel to each other and interconnected by at least one ladder rung, The stile members of the ladder sections are telescopically inserted into each other, so that the ladder sections can be moved relative to each other between an extended position and a collapsed position.
  • Prior art publications US2827216 , US4989692 and EP1686233 show A-frame ladders comprising two telescopically extendable and collapsible ladder sections. When set up in the inverted V-shaped configuration, the A-frame ladders are free standing. To enable the ladder to be set up against a wall, in the straight configuration the ladders are either folded in alignment with each other or are folded onto each other with one ladder partially collapsed.
  • Prior art publications US 2008/164097 A1 , CN104074455 and EP3165706 respectively show a stepladder with spread assembly and an A-frame ladder with a stand-off device.
  • the prior art designs have details that are not satisfactory, either with regard to their construction and/or their practical use.
  • the object of the present invention is to overcome at least some the disadvantages and problems with the prior art A-frame ladders by providing an A-frame ladder that is easy and safe to handle.
  • the invention therefore provides an A-frame ladder according to claim 1.
  • the A-frame ladder according to claim 1 comprises two telescopically extendable and collapsible ladder assemblies.
  • the A-frame ladder can be set up in an inverted V-shaped configuration, in which the ladder is free standing, and into a straight configuration, in which the ladders are folded onto each other.
  • the hinge axis is positioned relative to the top rung of the first and second ladder such that, when the two telescopic ladder assemblies are folded onto each other, both the first ladder assembly and the second ladder assembly can be in the extended configuration. Therefore, the ladder can be set up against a wall with both telescopic ladder assemblies in the extended configuration.
  • the first ladder assembly provides the support, i.e. is supported at both ends.
  • the first ladder assembly is at one end supported by the floor, and is at an opposite end supported by the wall, via the stand off device that is fixed to the first ladder assembly, while the second ladder assembly does not engage the floor or the wall. This provides for a stable set up.
  • switching from the A-configuration to the straight configuration does not require the user to unlock and partially collapse the second ladder assembly.
  • the A-frame ladder can be quickly and easily changed between the A-configuration and the straight configuration.
  • the configuration of a ladder according to the invention enables easy collapsing the ladder when in the straight configuration, when the manually operable release actuators on the bottom ladder sections are substantially level, and can thus be easily activated synchronous.
  • the present invention therefore provides an A-frame ladder that overcomes some the disadvantages and problems with the prior art A-frame ladders, and in particular provides an A-frame ladder that is easy and safe to handle.
  • An A-frame ladder according to claim 1 comprises:
  • the ladder assemblies each comprise ladder rungs, i.e. horizontal tubular members dimensioned and configured to support a person, and provided with a grip surface that provides a foot support.
  • An A-frame ladder according to the invention therefore differs from a step ladder comprising a ladder and a frame, which does not function as a ladder.
  • the rungs of the second ladder assembly are staggered relative to the rungs of the first ladder assembly, in the longitudinal direction of the ladder assemblies, when the first ladder assembly and the second ladder assembly are each collapsed, and the ladder is in the straight configuration, i.e. when the ladder is in the storage configuration.
  • the ladder comprises a lock assembly that secures the second ladder assembly relative to the first ladder assembly in the straight configuration.
  • the second ladder assembly is held, while in the extended position, adjacent the first ladder assembly when the ladder is set up against a wall.
  • the lock assembly is configured for securing the second ladder assembly against pivoting away from the first ladder assembly, when both ladder assemblies are collapsed and in the straight configuration, i.e. when the ladder is in the storage configuration.
  • a securing device e.g. a strip or bracket, is provided for securing the collapsed ladders relative to each other.
  • the two ladder assemblies preferably are substantially identical.
  • the ladders only differ at the lower ends, i.e. the configuration of the floor supports.
  • the stand off device comprises two mounts, each for engaging a ladder stile of the first ladder assembly, the mounts having a cylindrical shape for either receiving or being inserted into a tubular top end of the stile members.
  • the cylindrical shapes have a central axis that extends parallel to the ladder styles and at an angle with the stand off arms.
  • the stand off device is provided with mounts for receiving top ends of the stile members of the respective ladder assemblies.
  • the mounts for receiving the stile members of the second ladder assembly are hinged relative to the rest of the stand of device, more in particular can be hinged about the hinge axis, and thus hingedly connect the second ladder assembly with the stand off device and the first ladder assembly.
  • the two telescopic ladder assemblies comprise identical top ends.
  • the stand off device comprising mounts to secure the top ends of the respective ladder assemblies to the stand off device, is configured to position the hinge axis, in a longitudinal direction of the respective ladder assemblies, at different pivot distances relative to the top rung of the respective ladder assemblies.
  • the pivot distance i.e. the distance between the top rung of a ladder assembly and the hinge axis, is defined in the longitudinal direction of the respective ladder assemblies, i.e. in a direction parallel to the stile members of the respective ladder assembly, and with the ladder in the straight configuration, i.e. in a configuration in which the stile members of the first ladder assembly are parallel to the stile members of the second ladder assembly.
  • the first pivot distance is substantially the same or larger than the distance between two ladder rungs of the ladder assembly when in the extended configuration.
  • the ladder in the straight configuration, i.e. with both ladder assemblies fully extended, can be set up against the wall at an angle of at least 15 degrees, preferably at least 20 degrees, for example 25 degrees, with only the first ladder assembly supporting the A-frame ladder.
  • the ladder can be positioned with the stand off device against the wall, more in particular with the bumper end of the stand off device against the wall, the ladder enclosing an angle of at least 15 degrees, while the ladder is supported by the first ladder assembly only.
  • the first ladder assembly engages the floor while both ladder assemblies are fully extended.
  • the stand off arms are connected by one or more cross bars, the one or more cross bars running parallel to the rungs of the A-frame ladder, the one or more cross bars forming a surface, for example a platform or tool tray, and the rungs of the top ladder sections are spaced from the one or more cross bars.
  • the stile members of both ladder assemblies extend beyond the upper rungs of the respective ladder assemblies.
  • the distance between the upper rungs and the one or more cross bars is about the same or smaller than the distance between the rungs of the respective ladder assemblies when in the extended configuration.
  • the distance between the upper rungs and the one or more cross bars is similar to the distance between the rungs of the respective ladder assemblies when in the extended configuration.
  • the stand off arms of the stand of device and the platform are integrated into a single piece, e.g. are combined with cross bars that connect the two stand off arms.
  • the stand off device may comprise a single body to which the ladder assemblies are connected.
  • the ladder rungs are provided with top surface, i.e. a grip surface configured a person using the ladder to stand on, that is substantially horizontal when the ladder is in the A-configuration. Furthermore, when the ladder is in the A-configuration, the grip surfaces of the rungs of the first ladder assembly are substantially horizontal and are level with the grip surfaces of the rungs of the second ladder assembly.
  • the stand off arms extend at an angle to the stile members of the first ladder assembly, and the bumper ends are configured such that when the ladder is set up in the straight configuration against a wall, the grip surfaces of the rungs of the first ladder assembly are substantially horizontal.
  • a person using the ladder is provided with substantially horizontal grip surface when the ladder is set up in the A-configuration and when the ladder is set up in the straight configuration.
  • the stand off arms are connected by one or more cross bars that run parallel to the rungs and that form a surface that is substantially parallel to the grip surface of the ladder rungs of the first ladder assembly, when the ladder is in the straight configuration and when the ladder is in the A-configuration.
  • the surface that is formed by the cross bars is substantially horizontal when the ladder is in the A-configuration and when the ladder is set up in the straight configuration.
  • the telescopic ladder assemblies each have at least three ladder sections, each of said ladder sections having two tubular stile members arranged parallel to each other and interconnected at one end by a ladder rung to form a U-shaped ladder section, the stile members of each ladder section being telescopically inserted into the stile members of an adjacent ladder section.
  • the ladder assemblies typically comprises automatic latch mechanisms for locking the telescopically inserted stile members relative to one another when the ladder sections are extended, the latch mechanisms of each ladder section being associated with one or more actuators for unlocking the stile members in order to allow for collapsing of the ladder assembly.
  • the spreader assembly comprises a first spreader arm, which first spreader arm is at a first end hingedly connected to the first ladder assembly and a second spreader arm, which second spreader arm is at a first end hingedly connected to the second ladder assembly, and wherein the first spreader arm and the second spreader arm are each at a second end hingedly connected to each other, such that the spreader arms can be hinged between a deployed position, in which the spreader arms are extended, preferably are overextended, to secure the first ladder assembly and the second ladder assembly in the A-configuration, and a folded position, for when the A-frame ladder is in the straight configuration, in which folded position the spreader arms extend upwards from the ladder rungs and between the stile members of the top ladder sections.
  • the spreader arms When the spreader arms are in the extended position, they are essentially in line with each other. When overextended, the hinge point at which the spreader arms are connected to each other, is moved beyond the point at which the spreader arms are aligned. In this configuration, an extra effort is required to move the arms from the deployed position into the folded position.
  • first spreader arm is at a first end hingedly connected to the top rung of the first ladder assembly and the second spreader arm is at the first end hingedly connected to the top rung of the second ladder assembly.
  • the spreader arms of the spreader assembly are shorter than the first pivot distance, and preferably, when the A-frame ladder is in the straight configuration, the spreader arms do not extend beyond a top end of the stile members.
  • the spreader assembly comprises a hand grip, which hand grip enables a user to pull the spreader arms from the extended position, preferably from the overextended position, into the folded position, using the handgrip, and thus to move the ladder assemblies from the A-configuration into the straight configuration.
  • the hand grip is oriented to extend in a direction substantially parallel to the direction in which the rungs of the ladder extend.
  • Such a configuration facilitates a user of the ladder to collapse the spreader assembly by reaching between the stile members of the first ladder assembly, and pulling the hand grip in a direction that is generally upwards and towards the user when the ladder is in the A-configuration.
  • Such a spreader assembly furthermore enables bringing the ladder from the A-configuration into the straight configuration by a user without the need to reach around, or walk around, the side of the ladder to displace the spreaders.
  • the use of the hand grip helps to prevent the possibility of a user pinching their hands or fingers in the hinge of a spreader or spreader.
  • the spreader assembly comprises two parallel first arms, and two parallel second arms, the first arms each being connected at a first end to the top rung of the first ladder assembly and two parallel second arms each being connected at a first end to the top rung of the second ladder assembly, and wherein the first arms are each at a second end connected to a second end of one of the two second arms, and wherein the hand grip is provided between the two first arms, preferably near the second ends thereof.
  • the handgrip is connected to the first arms, preferably near the second ends thereof.
  • first arms are hingedly connected to the second arms via a hinge axle
  • the hand grip preferably is mounted on the hinge axle
  • the length of the first spreader arms differs from the length of the second spreader arms, such that, when the ladder is in the straight configuration, the spreader arms extend at an angle to the stile members of the first ladder assembly and extend beyond the stile members of the first ladder assembly, such that the handgrip is positioned outside the ladder, more in particular in front of the first ladder assembly, to enable a user to carry the ladder, in the collapsed and straight configuration, using the handgrip.
  • the spreader assembly is provided with locks for securing the spreader arms in the extended position.
  • first and the second ladder assembly each comprise a top ladder section, a bottom ladder section, and multiple intermediate ladder sections.
  • the stile members of the top ladder section and the intermediate ladder sections are telescopically inserted into the stile members of an adjacent lower ladder section, the adjacent lower ladder section being one of the intermediate ladder sections or the bottom ladder section, so that the one or more intermediate ladder sections and the top ladder section can be collapsed in a collapsing direction towards the bottom ladder section.
  • the top ladder section of each of the ladder assemblies has two tubular stile members arranged parallel to each other that are interconnected at an intermediate section by a ladder rung.
  • the intermediate ladder sections each have two tubular stile members arranged parallel to each other that are interconnected at a top end by a ladder rung,
  • the bottom ladder sections each have two tubular stile members arranged parallel to each other and interconnected by a top ladder rung and a bottom ladder rung,
  • the lock assembly is configured for securing the second ladder assembly against pivoting away from the first ladder assembly, when both ladder assemblies are collapsed and in the straight configuration, i.e. when the ladder is in the storage configuration.
  • the lock assembly is configured to be used when the ladder assemblies are extended and when the ladder assemblies are collapsed.
  • the ladder assembly can be extended and collapsed while the lock assembly is active, i.e. the ladder assemblies remain locked in the straight configuration when the ladder assemblies are collapsed or extended.
  • the lock assembly is provided on the lowest ladder section of the first ladder assembly and the second ladder assembly. This provides a user of the ladder with easy access to the lock assembly when the ladder assemblies are extended.
  • the lock assembly is integrated in the spreader assembly.
  • the spreader assembly preferably is provided at n intermediate ladder section, i.e. a ladder section that not comprises the top ladder rung or the bottom ladder rung.
  • the difference between the first pivot distance and the second pivot distance is in the range of 3-8 cm, preferably is in the range of 4-7 cm, for example is 6 cm.
  • the stile members of the first ladder assembly and the stile members of the second ladder assembly do not extend beyond the hinge axis.
  • the hinge axis more or less forms the pinnacle of the a-frame ladder when for example set up in the A-configuration. It is submitted that this feature is typical for A-frame ladders in general.
  • a supper structure is provided that does extend above the hinge axis, however, for example a frame to provide grip support for a user standing on the ladder. This supper structure is not a continuation or extension of the stile members of the ladder and does not comprise ladder rungs.
  • the first and the second ladder assembly each comprise a top ladder section, a bottom ladder section, and multiple intermediate ladder sections
  • the stile members of the top ladder section extend on opposite sides, i.e. below and above, of a top ladder rung, providing the top ladder section with a H-shape, and preferably the stile members of the top sections of the first and the second ladder assembly have the same length.
  • the top ladder section of the ladder assemblies only partially collapse, i.e. only the part of the stile members below the top ladder rung is telescopically received in the stile members of an intermediate ladder section.
  • the spreader assembly is provided between the top rungs of the ladder assemblies, preferably comprises first and second spreader arms that are connected to the top ladder rungs,
  • top ladder section with stile members that extend upward form the top ladder rung, thus provide a window, defined by the top ladder rungs, the part of the stile members extending upward from the top ladder rungs and optimally one or more cross bars of the stand off device, that can house the spreader arms, or at least part thereof, when the ladder is in the straight configuration.
  • the length of the first ladder assembly is identical to the length of the second ladder assembly.
  • the bottom ladder section and the intermediate ladder sections are provided with automatic latch mechanisms, said automatic latch mechanisms being adapted for automatically locking the stile members of the adjacent higher ladder section, the higher ladder section being one of the intermediate ladder sections or the top ladder section, in a fully extended position of said adjacent higher ladder section.
  • the automatic latch mechanisms of the intermediate ladder sections are each associated with a release actuator for unlocking the stile members of an adjacent higher ladder section in order to allow for automatic release and collapsing of the ladder assembly
  • the automatic latch mechanism of the bottom ladder section is associated with a manually operable release actuator for unlocking of the stile members of an adjacent higher ladder section, the adjacent higher ladder section being one of the multiple intermediate ladder sections, by a user in order to allow for a manually release and collapsing of the ladder assembly.
  • the length of the first ladder assembly is identical to the length of the second ladder assembly.
  • the rungs are connected with plastic connectors to the stile members, and the connectors of the first ladder assembly, due to the second ladder assembly being staggered relative to the first ladder assembly, are not level with the connectors of the second ladder assembly, and vice versa, when the ladder is in the straight configuration. Instead, the connectors of the second ladder assembly are located at least partially above the connectors of the first ladder assembly.
  • the hinge axis is aligned with a central axis of the stile members of the second ladder assembly.
  • the invention furthermore provides a method for using a ladder according to the invention, the method comprising:
  • the method comprises the steps:
  • Fig. 1 shows an exemplary embodiment of an A-frame ladder 1 according to the invention in a free standing A-configuration.
  • Fig. 2 shows the same ladder in a straight configuration.
  • the A-frame ladder 1 comprises a first telescopic ladder assembly 2 and a second telescopic ladder assembly 3.
  • the telescopic ladder assemblies are hingedly connected such that the second ladder assembly 3 is pivotal about a hinge axis 4 relative to the first ladder assembly 2 between the A-configuration and the straight configuration.
  • the ladder assemblies form an inverted V. This configuration enables a free standing set up on a floor.
  • the ladder assemblies are parallel to each other. This configuration enables a set up of the A-frame ladder against a wall, which will be discussed in more detail below.
  • the collapsible ladder assemblies each have multiple ladder sections 5.
  • Each ladder section comprises two tubular stile members 6 arranged parallel to each other and interconnected by at least one ladder rung 7. These ladder rungs are provided with a grip surface 8.
  • the ladder assemblies each comprise ladder rungs, i.e. horizontal tubular members dimensioned and configured to support a person, and provided with a grip surface that provides a foot support.
  • An A-frame ladder according to the invention therefore differs from a step ladder comprising a ladder and a frame, which does not function as a ladder.
  • the stile members 6 of the ladder sections 5 are telescopically inserted into each other, so that the ladder sections can be moved relative to each other between an extended position and a collapsed position.
  • the ladder of Fig. 1 is for example shown in an extend configuration in Fig. 1 and fig,. 2 and in a collapsed configuration in Fig. 5 and Fig. 6 .
  • the A-framer ladder is furthermore provided with a stand-off device 9, a spreader assembly 10, and a lock assembly 11.
  • the stand off device 9 is configured for supporting the ladder 1 in the straight configuration against a wall.
  • the stand off device 9 comprises two stand off arms 12, that each have a base end 13, fixed to a top end of the first ladder assembly, and a bumper end 14 for engaging the wall.
  • the spreader assembly 10 is configured for securing the second ladder assembly 3 against spreading away from the first ladder assembly 2, when the ladder 1 is set up in the A-configuration.
  • the spreader assembly secures the second ladder assembly relative to the first ladder assembly in the A-configuration, and prevents the ladder assemblies from pivoting away from each other when the ladder is loaded, e.g. by a person climbing the ladder.
  • the lock assembly 11 is configured for securing the second ladder assembly 3 relative to the first ladder assembly 2 in the straight configuration. Thus, when the ladder is set up against a wall, the second ladder assembly stays positioned adjacent the first ladder assembly.
  • the second ladder assembly 3 at a top end thereof, is hingedly connected to the stand off arms 12, between the base end 13 and the bumper end 14 thereof, such that the hinge axis 4 is in line with the stile members 6 of the second ladder assembly 3.
  • the hinge axis 4 is furthermore aligned with a central axis 15 of the stile members of the second ladder assembly 3.
  • the hinge axis 4 in a longitudinal direction of the respective ladder assemblies, is spaced relative to a top rung 16 of the first ladder assembly 2 at a first pivot distance 18, and is spaced relative to a top rung 17 of the second ladder assembly 3 at a second pivot distance 19, wherein the second pivot distance 19 is smaller than the first pivot distance 18, see Fig. 3 .
  • the pivot distance i.e. the distance between the top rung of a ladder assembly and the hinge axis, is defined in the longitudinal direction of the respective ladder assemblies, i.e. in a direction parallel to the stile members of the respective ladder assembly, and with the ladder in the straight configuration, i.e. in a configuration in which the stile members of the first ladder assembly are parallel to the stile members of the second ladder assembly.
  • the rungs 7 of the second ladder assembly 3 are level with the rungs 7 of the first ladder assembly 2 when the first and second ladder assembly are each extended and the ladder is set up on a floor 20 in the A-configuration. In this condition, the ladder 1 is thus supported by both the first ladder assembly 2 and the second ladder assembly 3 on the floor 20, see Fig.1 .
  • the first pivot distance 18 is substantially the same or larger than the distance between two ladder rungs of the ladder assemblies when in the extended configuration.
  • the rungs 7 of the second ladder assembly 3 are staggered relative to the rungs 7 of the first ladder assembly 2, in the longitudinal direction of the ladder assemblies, when the first ladder assembly 2 and the second ladder assembly 3 are each extended and the ladder is set up against a wall 21 in the straight configuration, see Fig. 2 .
  • the A-frame ladder in this condition is thus supported on the floor 20 by the first ladder assembly 2 only.
  • the bottom end of the lower stile members 6 of the second ladder assembly 3 do not engage the floor.
  • the first ladder assembly is at one end supported by the floor, and is at an opposite end supported by the wall, via the stand off device that is fixed to the first ladder assembly, while the second ladder does not engage the floor or the wall.
  • the hinge axis 4 is positioned relative to the top rung 16 of the first ladder assembly 2 and second ladder assembly 3 such that, when the two telescopic ladder assemblies are folded onto each other, i.e. in the straight configuration, both the first ladder assembly and the second ladder assembly can be in the extended configuration. Therefore, the ladder can be set up against a wall with both telescopic ladder assemblies in the extended configuration.
  • the first ladder provides the support, i.e. is supported at both ends.
  • the first ladder is at one end supported by the floor, and is at an opposite end supported by the wall, via the stand off device that is fixed to the first ladder, while the second ladder does not engage the floor or the wall. This provides for a stable set up.
  • the A-frame ladder 1 thus allows for switching from the A-configuration to the straight configuration without the user having to unlock and partially collapse the second ladder assembly.
  • the A-frame ladder can be quickly and easily changed between the A-configuration and the straight configuration.
  • the configuration of the a-frame ladder 1 facilitates collapsing the ladder when in the straight configuration, because the manually operable release actuators on the bottom ladder sections are substantially level, and can thus be easily activated synchronous.
  • the first ladder assembly 2 and the second ladder assembly 3 each comprise a top ladder section 29, a bottom ladder section 30, and multiple intermediate ladder sections 31.
  • the stile members 7 of the top ladder section 29 and the intermediate ladder sections 31 are telescopically inserted into the stile members of an adjacent lower ladder section, the adjacent lower ladder section being one of the intermediate ladder sections or the bottom ladder section, so that the one or more intermediate ladder sections and the top ladder section can be collapsed in a collapsing direction towards the bottom ladder section.
  • the stile members 6 of the top ladder section 29 extend on opposite sides, i.e. below and above, of a top ladder rungs.
  • the top ladder sections are provided with a H-shape.
  • the top ladder section 29 of the ladder assemblies only partially collapse, i.e. only the part of the stile members below the top ladder rung is telescopically received in the stile members of an intermediate ladder section.
  • the spreader assembly 10 is provided between the top rungs of the ladder assemblies and comprises first and second spreader arms that are connected to the top ladder rungs,
  • top ladder section with stile members that extend upward form the top ladder rung, provides a window, defined by the top ladder rungs, the part of the stile members extending upward from the top ladder rungs, and, in the embodiment shown, the cross bar of the stand off device.
  • the window houses part of the spreader arms, when the ladder is in the straight configuration.
  • the bottom ladder section 30 and the intermediate ladder sections 31 are provided with automatic latch mechanisms.
  • the automatic latch mechanisms are adapted for automatically locking the stile members of the adjacent higher ladder section, the higher ladder section being one of the intermediate ladder sections or the top ladder section, in a fully extended position of said adjacent higher ladder section.
  • the automatic latch mechanisms of the intermediate ladder sections are each associated with a release actuator for unlocking the stile members of an adjacent higher ladder section in order to allow for automatic release and collapsing of the ladder assembly.
  • the automatic latch mechanism of the bottom ladder section is associated with a manually operable release actuator 32 for unlocking of the stile members of an adjacent higher ladder section, the adjacent higher ladder section being one of the multiple intermediate ladder sections, by a user in order to allow for a manually release and collapsing of the ladder assembly.
  • the lock assembly is configured for securing the second ladder assembly against pivoting away from the first ladder assembly, when both ladder assemblies are collapsed and in the straight configuration, i.e. when the ladder is in the storage configuration.
  • the lock assembly is configured to be used when the ladder assemblies are extended and when the ladder assemblies are collapsed.
  • the ladder assembly can be extended and collapsed while the lock assembly is active, i.e. the ladder assemblies remain locked in the straight configuration when the ladder assemblies are collapsed or extended.
  • the stand off device 9 is provided with mounts 22 for receiving top ends of the stile members 6 of the respective ladder assemblies.
  • the mounts 22 have a cylindrical shape for receiving a tubular top end of the stile members.
  • the cylindrical shapes have a central axis that extends parallel to the ladder styles.
  • the two mounts 22 for engaging the stile members of the first ladder assembly 2 extend and at an angle with the stand off arms 12.
  • the two mounts 22 for receiving the stile members of the second ladder assembly 3 are hinged, more in particular can be hinged about the hinge axis 4, and thus hingedly connect the second ladder assembly 3 with the stand off device 9 and the first ladder assembly 2.
  • the two telescopic ladder assemblies comprise identical top ends. It is the stand off device, comprising the mounts 22 to secure the top ends of the respective ladder assemblies to the stand off device, that is configured to position the hinge axis 4, in a longitudinal direction of the respective ladder assemblies, at the different pivot distances relative to the top rung of the respective ladder assemblies.
  • the stand off arms 12 are connected by a cross bar 23.
  • the cross bar 23 runs parallel to the rungs 7 of the A-frame ladder 1, and forms a platform with a tool tray 25.
  • the rungs 7 of the top ladder sections are spaced from the cross bar.
  • the stile members 6 of both ladder assemblies extend beyond the top, or upper, rungs 16,17 of the respective ladder assemblies.
  • the cross bar 23 runs parallel to the rungs 7 and forms a platform, with the tool tray at its centre, that is substantially parallel to the grip surface 8 of the ladder rungs of the first ladder assembly 2, when the ladder 1 is in the straight configuration and when the ladder is in the A-configuration.
  • the platform that is formed by the cross bars is substantially horizontal when the ladder is in the A-configuration and when the ladder is set up in the straight configuration.
  • the stand off arms 12 extend at an angle to the stile members 6 of the first ladder assembly 2, and the bumpers, more in particular the bumper ends, are configured such that when the ladder is set up in the straight configuration against a wall, the grip surfaces 8 of the rungs 7 of the first ladder assembly 2 are substantially horizontal.
  • a person using the ladder is provided with substantially horizontal grip surface when the ladder is set up in the A-configuration and when the ladder is set up in the straight configuration.
  • the spreader assembly 10 comprises two parallel first spreader arms 26, which first spreader arms are at a first end hingedly connected to the top rung 16 of the first ladder assembly 2, and two parallel second spreader arms 28, which second spreader arms are at a first end hingedly connected to the top rung 17 of the second ladder assembly 3.
  • Each of the first spreader arms 26 is at a second end hingedly connected to a second end of one of the second spreader arms 27, such that the spreader arms can be hinged between a deployed position and a folded position.
  • the spreader arms 26, 27 of the spreader assembly 10 are extended, preferably are overextended, to secure the first ladder assembly 2 and the second ladder assembly 3 in the A-configuration, see Fig. 1 and Fig. 4 .
  • the spreader arms 26, 27 are in the extended position, they are essentially in line with each other.
  • the hinge point at which the spreader arms are connected to each other is moved beyond the point at which the spreader arms are aligned. In this configuration, an extra effort is required to move the arms from the deployed position into the folded position.
  • the spreader arms In the folded position the spreader arms extend upwards from the ladder rungs 7 and extend between the stile members 6 of the top ladder sections, when the A-frame ladder 1 is in the straight configuration, see Fig. 2 and Fig. 5 .
  • the spreader arms In the folded position, the spreader arms are hinged towards each other, such that they extend substantially parallel to each other, or at a shape angle to each other, providing a V-shape when seen in side view.
  • a hand grip 24 is provided between the two first spreader arms 26, near the second ends thereof.
  • the hand grip 24 enables a user to pull the spreader arms from the extended position, preferably from the overextended position, into the folded position, using the handgrip 24, and thus to move the ladder assemblies from the A-configuration into the straight configuration.
  • the hand grip or handle 24 is coupled to spreader arms without curtailing the folding nature of the spreader arms.
  • the hand grip 24 is oriented to extend in a direction substantially parallel to the direction in which the rungs 7 of the ladder extend.
  • Such a configuration facilitates a user of the ladder to collapse the spreader assembly by reaching between the stile members 6 of the first ladder assembly 2, and pulling the hand grip 24 in a direction that is generally upwards and towards the user when the ladder is in the A-configuration.
  • Such a spreader assembly furthermore enables bringing the ladder from the A-configuration into the straight configuration by a user without the need to reach around, or walk around, the side of the ladder to displace the spreaders.
  • the use of the hand grip helps to prevent the possibility of a user pinching their hands or fingers in the hinge of a spreader or spreader.
  • the spreader arms of the spreader assembly are shorter than the first pivot distance, and, when the A-frame ladder is in the straight configuration, the spreader arms do not extend beyond a top end of the stile members, see Fig. 2
  • the length of the first spreader arms 26 differs from the length of the second spreader arms 27, such that, when the ladder 1 is in the straight configuration, the spreader arms extend at an angle to the stile members 6 of the first ladder assembly 2 and extend beyond the stile members 6 of the first ladder assembly 2, such that the handgrip 24 is positioned outside the ladder, more in particular in front of the first ladder assembly, to enable a user to carry the ladder, in the collapsed and straight configuration, using the handgrip.
  • the lock assembly is provided on the lowest ladder section of the first ladder assembly and the second ladder assembly. This provides a user of the ladder with easy access to the lock assembly when the ladder assemblies are extended.
  • the lock assembly may comprise a hook that is resiliently mounted on a ladder section of the first ladder assembly, that, similar to a click finger, hooks behind a notch mounted on the second ladder assembly.
  • the lock assembly is integrated in the spreader assembly. In such an embodiment, the spreader assembly preferably is provided at n intermediate ladder section, i.e. a ladder section that not comprises the top ladder rung or the bottom ladder rung.
  • the stile members 6 of the first ladder assembly 2 and the stile members 6 of the second ladder assembly 2 do not extend beyond the hinge axis 4.
  • the hinge axis 4 more or less forms the pinnacle of the a-frame ladder when for example set up in the A-configuration, see Fig. 1 . It is submitted that this feature is typical for A-frame ladders in general.
  • the length of the first ladder assembly 2 is identical to the length of the second ladder assembly 3.
  • the rungs 7 are connected with plastic connectors 28 to the stile members 6. Due to the second ladder assembly 3 being staggered relative to the first ladder assembly 2, the connectors 28 of the first ladder assembly are not level with the connectors of the second ladder assembly when the ladder is in the straight configuration and vertical. Instead, the connectors of the second ladder assembly are located at least partially above the connectors of the first ladder assembly.
  • the hinge axis 4 is aligned with a central axis of the stile members 6 of the second ladder assembly 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Claims (15)

  1. Échelle double (1), l'échelle comprenant :
    - un premier ensemble échelle télescopique (2) et un second ensemble échelle télescopique (3) qui sont reliés de manière articulée de sorte que le second ensemble échelle (3) puisse pivoter autour d'un axe d'articulation (4) par rapport au premier ensemble échelle (2) entre une configuration droite, dans laquelle les ensembles échelles sont parallèles l'un à l'autre pour appuyer l'échelle contre un mur, et une configuration double, dans laquelle les ensembles échelles forment un V inversé pour une installation autostable sur un sol,
    les ensembles échelles (2, 3) ayant chacun plusieurs sections d'échelle (5), chaque section d'échelle comprenant deux éléments de montant tubulaires (6) disposés parallèlement l'un à l'autre et reliés entre eux par au moins un échelon (5), l'au moins un échelon (5) étant pourvu d'une surface d'adhérence (8), et les éléments de montant (6) des sections d'échelle (5) étant insérés de manière télescopique les uns dans les autres, de sorte que les sections d'échelle (5) peuvent être déplacées les unes par rapport aux autres entre une position étendue et une position rétractée ;
    - un dispositif d'écartement (9) pour soutenir l'échelle (1) dans la configuration droite contre le mur, le dispositif d'écartement comprenant deux bras d'écartement (12), qui ont chacun une extrémité de base (13), fixée à une extrémité supérieure du premier ensemble échelle (2), et une extrémité d'amortissement (14) destinée à entrer en contact avec le mur ;
    - un ensemble entretoise (10) pour empêcher le second ensemble échelle (3) de s'écarter du premier ensemble échelle (2), dans la configuration double ; et
    - un ensemble de verrouillage (11), pour fixer le second ensemble échelle (3) par rapport au premier ensemble échelle (2) dans la configuration droite ;
    dans laquelle le second ensemble échelle (3), à une extrémité supérieure de celui-ci, est relié de manière articulée aux bras d'écartement (12), entre l'extrémité de base (13) et l'extrémité d'amortissement (14) de ceux-ci, de sorte que l'axe d'articulation (4) est aligné avec les éléments de montant (6) du second ensemble échelle (3), et
    dans laquelle l'axe d'articulation (4), dans une direction longitudinale des ensembles échelles (2, 3), est espacé par rapport à un échelon supérieur (16) du premier ensemble échelle (2) d'une première distance de pivotement (18), et est espacé par rapport à un échelon supérieur (17) du second ensemble échelle (3) d'une seconde distance de pivotement (19), et dans laquelle la seconde distance de pivotement (19) est inférieure à la première distance de pivotement (18),
    dans laquelle les échelons du second ensemble échelle (3) sont au même niveau que les échelons du premier ensemble échelle (2) lorsque le premier ensemble échelle (2) et le second ensemble échelle (3) sont chacun étendus et que l'échelle (1) est installée sur le sol en configuration double, et l'échelle (1) est ainsi supportée à la fois par le premier ensemble échelle (2) et par le second ensemble échelle (3) sur le sol, et
    dans laquelle les échelons du second ensemble échelle (3) sont décalés par rapport aux échelons du premier ensemble échelle (2), dans la direction longitudinale des ensembles échelles, lorsque le premier ensemble échelle (2) et le second ensemble échelle (3) sont chacun étendus et que l'échelle (1) est posée contre le mur dans la configuration droite, et l'échelle (1) est ainsi supportée sur le sol uniquement par le premier ensemble échelle (2).
  2. Échelle double selon la revendication 1, l'échelle (1), dans la configuration droite, c'est-à-dire avec les deux ensembles échelles (2, 3) complètement étendus, pouvant être posée contre le mur à un angle d'au moins 15 degrés, de préférence d'au moins 20 degrés, par exemple de 25 degrés, l'échelle double (1) étant supportée uniquement par le premier ensemble échelle (2).
  3. Échelle double selon la revendication 1 ou la revendication 2, dans laquelle les bras d'écartement (13, 14) sont reliés par une ou plusieurs traverses (23), la ou les traverses (23) s'étendant parallèlement aux échelons (7) de l'échelle double (1), la ou les traverses (23) formant une surface, par exemple une plate-forme ou un plateau à outils (25), et dans laquelle les échelons des sections supérieures d'échelle (29) sont espacés de la ou des traverses (23).
  4. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle les bras d'écartement (13, 14) s'étendent à un certain angle par rapport aux éléments de montant (6) du premier ensemble échelle (2), et les extrémités d'amortissement (14) sont configurées de telle sorte que, lorsque l'échelle (1) est installée dans la configuration droite contre le mur, les surfaces d'adhérence (8) des échelons (7) du premier ensemble échelle (2) sont sensiblement horizontales.
  5. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle l'ensemble entretoise (10) comprend un premier bras d'entretoise (26), ledit premier bras d'entretoise (26) étant, à une première extrémité, relié de manière articulée à l'échelon supérieur (16) du premier ensemble échelle, et un second bras d'entretoise (27), ledit second bras d'entretoise (27) étant, à une première extrémité, relié de manière articulée à l'échelon supérieur (17) du second ensemble échelle (3), et dans laquelle le premier bras d'entretoise (26) et le second bras d'entretoise (27) sont chacun, à une seconde extrémité, reliés de manière articulée l'un à l'autre, de sorte que les bras d'entretoise peuvent être articulés entre :
    une position déployée, dans laquelle les bras d'entretoise sont étendus, de préférence surétendus, pour fixer le premier ensemble échelle (2) et le second ensemble échelle (3) dans la configuration double, et
    une position pliée, pour le cas où l'échelle double (1) est dans la configuration droite, dans laquelle les bras d'entretoise s'étendent vers le haut à partir des échelons et entre les éléments de montant des sections supérieures d'échelle (29).
  6. Échelle double selon la revendication 5, dans laquelle les bras d'entretoise de l'ensemble entretoise (10) sont plus courts que la première distance de pivotement (18) et, de préférence, lorsque l'échelle double (1) est dans la configuration droite, les bras d'entretoise ne s'étendent pas au-delà d'une extrémité supérieure des éléments de montant (6).
  7. Échelle double selon la revendication 5 ou la revendication 6, dans laquelle l'ensemble entretoise (10) comprend une poignée (24), ladite poignée permettant à un utilisateur de tirer les bras d'entretoise de la position étendue, de préférence de la position surétendue, à la position pliée, en utilisant la poignée, et ainsi de déplacer les ensembles échelles de la configuration double à la configuration droite.
  8. Échelle double selon la revendication 7, dans laquelle l'ensemble entretoise (10) comprend deux premiers bras parallèles (26) et deux seconds bras parallèles (27), les premiers bras étant chacun reliés, à une première extrémité, à l'échelon supérieur (16) du premier ensemble échelle (2) et deux seconds bras parallèles (27) étant chacun reliés, à une première extrémité, à l'échelon supérieur (17) du second ensemble échelle (3), et dans laquelle les premiers bras (26) sont chacun, à une seconde extrémité, reliés à une seconde extrémité de l'un des deux seconds bras (27), et dans laquelle la poignée (24) est placée entre les deux premiers bras (26), de préférence près de leurs secondes extrémités, de préférence dans laquelle la poignée (24) est reliée aux premiers bras (26), de préférence près de leurs secondes extrémités, ou dans laquelle les premiers bras (26) sont reliés de manière articulée aux seconds bras (27) par l'intermédiaire d'un axe d'articulation, et dans laquelle la poignée (24) est de préférence montée sur l'axe d'articulation.
  9. Échelle double selon la revendication 7 ou la revendication 8, dans laquelle la longueur des premiers bras d'entretoise (26) diffère de la longueur des seconds bras d'entretoise (27), de sorte que, lorsque l'échelle (1) est dans la configuration droite, les bras d'entretoise s'étendent à un angle par rapport aux éléments de montant du premier ensemble échelle (2) et s'étendent au-delà des éléments de montant du premier ensemble échelle, de sorte que la poignée (24) est positionnée à l'extérieur de l'échelle (1), plus particulièrement devant le premier ensemble échelle (2), pour permettre à un utilisateur de porter l'échelle (1), dans la configuration rétractée et droite, à l'aide de la poignée (24).
  10. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle l'ensemble de verrouillage est configuré pour empêcher le second ensemble échelle (3) de s'écarter par pivotement du premier ensemble échelle (2), lorsque les deux ensembles échelles sont rétractés et dans la configuration droite, c'est-à-dire lorsque l'échelle (1) est dans une configuration de stockage.
  11. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle l'ensemble de verrouillage est intégré à l'ensemble entretoise, et/ou dans laquelle l'ensemble de verrouillage comprend un crochet qui est monté élastiquement sur une section d'échelle du premier ensemble échelle (2) et une encoche montée sur le second ensemble échelle (3), ou vice versa, de sorte que, lorsque le premier ensemble échelle (2) est plié contre le second ensemble échelle (3), le crochet s'accroche derrière l'encoche.
  12. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle le premier ensemble échelle (2) et le second ensemble échelle (3) comprennent chacun une section d'échelle supérieure (29), une section d'échelle inférieure (30) et de multiples sections d'échelle intermédiaires (31), de préférence dans laquelle les éléments de montant des sections d'échelle supérieures (29) s'étendent sur des côtés opposés, c'est-à-dire au-dessus et au-dessous, de l'échelon, donnant aux sections d'échelle supérieures (29) une forme en H, et les éléments de montant des sections d'échelle supérieures (29) du premier ensemble échelle (2) et du second ensemble échelle (3) ont la même longueur.
  13. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle la longueur du premier ensemble échelle (2) est identique à la longueur du second ensemble échelle (3) et/ou l'axe d'articulation (4) est aligné avec un axe central des éléments de montant (6) du second ensemble échelle (3).
  14. Échelle double selon une ou plusieurs des revendications précédentes, dans laquelle les échelons (7) sont reliés par des pièces de raccordement en plastique (28) aux éléments de montant (6), et dans laquelle les pièces de raccordement (28) du premier ensemble échelle (2), du fait que le second ensemble échelle (3) est décalé par rapport au premier ensemble échelle (2), ne sont pas au même niveau que les pièces de raccordement (26) du second ensemble échelle (3), et vice versa, lorsque l'échelle (1) est dans la configuration droite.
  15. Procédé d'utilisation de l'échelle selon une ou plusieurs des revendications précédentes, le procédé comprenant :
    - verrouiller le second ensemble échelle (3) par rapport au premier ensemble échelle (2) et étendre le premier ensemble échelle (2) et le second ensemble échelle (3) ; et
    - installer l'échelle (1), avec les deux ensembles échelles étendus, dans la configuration droite contre le mur.
EP22793420.5A 2021-09-22 2022-09-21 Échelle portable comportant un dispositif de recul Active EP4405557B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2029224A NL2029224B1 (en) 2021-09-22 2021-09-22 Portable ladder with a stand off device
PCT/EP2022/076240 WO2023046760A1 (fr) 2021-09-22 2022-09-21 Échelle portable comportant un dispositif de recul

Publications (3)

Publication Number Publication Date
EP4405557A1 EP4405557A1 (fr) 2024-07-31
EP4405557B1 true EP4405557B1 (fr) 2025-09-17
EP4405557C0 EP4405557C0 (fr) 2025-09-17

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EP22793420.5A Active EP4405557B1 (fr) 2021-09-22 2022-09-21 Échelle portable comportant un dispositif de recul

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EP (1) EP4405557B1 (fr)
CN (1) CN118382745A (fr)
NL (1) NL2029224B1 (fr)
WO (1) WO2023046760A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827216A (en) 1955-05-25 1958-03-18 Leonard B Napolitano Telescopic step or rung ladders
BE1004040A6 (fr) 1989-06-16 1992-09-15 Show Min Liaw Echelle extensible a usages multiples.
EP1686233A1 (fr) 2005-02-01 2006-08-02 Telesteps AB Echelle escamotable multifonctionnelle
US20080164097A1 (en) * 2006-02-01 2008-07-10 Telesteps Ab Collapsible Combination Ladder
NZ587730A (en) * 2008-03-07 2013-01-25 Wing Entpr Inc Ladders with locking, spreading, or holding mechanisms, and ladder components and related methods
CN104074455B (zh) * 2013-03-25 2018-03-27 阿禄因康株式会社 一种梯凳止开装置
US10550638B2 (en) * 2015-11-09 2020-02-04 Louisville Ladder Inc. Stepladder adapted for use as a single ladder or an extension ladder
CN112368458A (zh) * 2018-06-08 2021-02-12 伟英企业有限公司 组合梯、梯子部件和相关方法
KR102099306B1 (ko) * 2019-08-22 2020-04-09 장영균 트레이의 높이 조절이 가능한 사다리
DE102020200218A1 (de) * 2020-01-09 2021-07-15 Markus Wörner Wandschutzeinheit für Anlegeleiter

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WO2023046760A1 (fr) 2023-03-30
EP4405557A1 (fr) 2024-07-31
EP4405557C0 (fr) 2025-09-17
CN118382745A (zh) 2024-07-23
NL2029224B1 (en) 2023-03-29

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