EP2215323B1 - Teleskopleiteranordnung - Google Patents

Teleskopleiteranordnung Download PDF

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Publication number
EP2215323B1
EP2215323B1 EP08705071.2A EP08705071A EP2215323B1 EP 2215323 B1 EP2215323 B1 EP 2215323B1 EP 08705071 A EP08705071 A EP 08705071A EP 2215323 B1 EP2215323 B1 EP 2215323B1
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EP
European Patent Office
Prior art keywords
ladder
rung
wall
actuators
section
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
EP08705071.2A
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English (en)
French (fr)
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EP2215323A1 (de
Inventor
Caspar Bernard Lampe
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
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LAMPE HOLDING BV
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Filing date
Publication date
Application filed by LAMPE HOLDING BV filed Critical LAMPE HOLDING BV
Priority to EP15188391.5A priority Critical patent/EP2998501B8/de
Publication of EP2215323A1 publication Critical patent/EP2215323A1/de
Application granted granted Critical
Publication of EP2215323B1 publication Critical patent/EP2215323B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/04—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
    • E06C7/08—Special construction of longitudinal members, or rungs or other treads
    • E06C7/082—Connections between rungs or treads and longitudinal members
    • E06C7/086—Connections between rungs or treads and longitudinal members with a connecting piece inserted in a hollow rung

Definitions

  • the present invention relates to a telescopically extendable and collapsible ladder assembly having 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 assembly further 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.
  • ladder assemblies have become quite popular as portable ladders, such as a straight telescopic ladder or a step ladder, but also for stationary mounting, such as a loft ladder providing access to a loft.
  • the present invention aims to propose measures that allow for improvements. These measures can either be applied alone or in combination. In a most preferred embodiment of the invention all measures are applied in a ladder assembly to obtain an optimum result.
  • the present invention relates to a ladder assembly according to the preamble of claim 1, which features are disclosed in US 1 712 942 .
  • EP 1 402 14a and EP 1 516 999 , it is disclosed to mount the actuators at the front of the rung and in close proximity to the stile members so that each actuator is manually and individually operable by a user holding his hands around the stile members, in particular around the connectors at the upper end of the stile members.
  • This prior art design thus requires the user to hold both his hands around the ladder stiles during the collapse of the ladder. It is alleged that this design increases safety for the user with regard of a user's hand being seized between two rungs upon collapse of a ladder. Whilst that may be correct from said perspective, this arrangement does not take into account the fact that in many situations the user also needs to stabilize the ladder so it does not sway or hit against something during the collapse.
  • the present invention aims to provide an improved telescopic ladder assembly that allows the user to employ a single hand for actuating the manually operable actuators and use his other hand for other purposes, e.g. grip the ladder at a higher up position to keep it stable and/or guide a ladder section during its descend.
  • the present invention achieves this aim by providing a telescopic ladder assembly according to claim 1.
  • Arranging the slidable actuators in the elongated recessed portion has the advantage that the actuators are generally protected from the feet of a person on the ladder, yet can have a suitable thickness to be operated by a single hand, e.g. by thumb and index finger.
  • the slots or single contiguous slot in the front wall are preferably located in the recessed portion of the front wall.
  • the actuators are effectively arranged at a mutual distance of less than 10 centimetres to facilitate single handed operation.
  • the actuators protrude at the front of the rung between 1 and 4 millimetres. As mentioned above the location of these actuators in the elongated recessed portion of the front wall provides protection for the actuators. Yet it has been found that "some forward protrusion" of these centrally located actuators cause the effect that the actuators provide additional grip for a hand grasping around the central portion of the rung. In practice the actuators will fall in the palm of the hand and so provide additional grip.
  • recessed portions in the front and rear wall give the rung an enhanced stability, allowing in particular the provision of one or more holes or slots in said recessed wall portion in the central region of the rung for the mounting of one or more actuators associated with the latch mechanisms.
  • the top wall is in cross section upwardly convex, and the bottom wall is in cross section upwardly concave, preferably of substantially identical curvature.
  • the front wall and the rear wall are symmetrical.
  • FIGS 1 and 2 show an example of a ladder assembly according to the invention, here embodied as a straight telescopic ladder 1.
  • the ladder assembly may also be part of another "ladder product" such as a stepladder or combination ladder, a work platform with ladder like telescopic legs, etc.
  • the ladder 1 includes a lowermost ladder section 2 having two tubular stile members 2a, b which are arranged parallel to each other.
  • Each stile member 2a, b of the lowermost ladder section 2 here is provided with a ground engaging foot member 2c (e.g. of rubber or the like).
  • the stile members 2a, b are interconnected at their upper ends by a ladder rung 2d and in this example (as is preferred) also by a lowermost ladder rung 2e.
  • the ladder 1 further comprises at least two additional ladder sections; here seven additional ladder sections 3-9.
  • These ladder sections 3-9 each have two tubular stile members arranged parallel to each other and interconnected at the upper end by a ladder rung to form a U-shaped ladder section.
  • the stile members of each ladder section are telescopically inserted into the stile members of a lower and adjacent ladder section.
  • the ladder 1 further comprising automatic latch mechanisms (as will be explained by example in more detail below) for locking the telescopically inserted stile members relative to one another when the ladder sections are extended, the latch mechanisms being associated with actuators for unlocking the stile members in order to allow for collapsing or retracting of the ladder assembly.
  • automatic latch mechanisms as will be explained by example in more detail below
  • actuators are manually operated actuators, indicated with reference numeral 10 in figure 1 ,
  • the actuators 10 are the slidable actuators and are arranged centrally on the front side of the rung 2d so as to be operable simultaneously with a single hand.
  • the rungs 2d-9d are connected to the associated stile members 2a, b via connectors 2f, g of which preferred embodiments will be illustrated with reference to figures 10a-d .
  • An issue related to telescopic ladders is the velocity of the telescopic section when the ladder is collapsed (or extended when used as a loft ladder or the like).
  • multiple of the ladder sections are preferably provided with damper members that provide retardation of gravity induced velocity of the ladder section upon collapse and/or extension of the ladder section, each damper member being mounted on a stile member so as to engage on the inside of the stile member of the adjacent ladder section.
  • FIG 3 an example is shown of an inventive friction damper member 30 that provides, as only substantial source, the desired retardation on the basis of surface friction with the inside of the stile member of the lower ladder section.
  • the effective weight of the ladder sections to be retarded differs from above to below; it effectively increases in said direction in ladder 1, as the release and subsequent collapse of a ladder section such as section 3 towards the lower ladder section, such as section 2, brings in motion all ladder section above said section 3 as well. Therefore it is proposed that the damper members 30 of the respective ladder sections provide a differing surface friction resistance in order to compensate for the total weight of the ladder sections to be retarded, so a greater resistance for a lower section compared to a higher section of the ladder.
  • the damper members that provide a differing surface friction resistance are made of materials, preferably plastic materials, most preferably injection-moulded, having a different modulus of elasticity. In a practical solution this can be done by manufacturing the damper members (preferably as unitary components) from a fibre reinforced plastic material, the different modulus of elasticity being obtained by adaptation of the percentage and/or composition of the fibre material.
  • the plastic material of the damper members 30 is glass-filled, e.g. glass-filled nylon.
  • the damper member 30 has an annular body having an upper fastening portion 31 which is inserted into the stile member at an end thereof, and having multiple friction tabs that extend below the annular body and are spaced from another in circumferential direction.
  • the upper fastening portion 31 includes integral elastic fasteners 33 that are adapted to snap into associated apertures in the stile member for connecting the member 30 to the stile member.
  • annular body of the damper member 30 prefferably has an annular flange which rests against the stile member end face.
  • Figures 4, 5, 7 show a preferred design of a rung for a telescopic ladder, which is incorporated in a ladder according to the invention.
  • rung is considered to be any of the rungs of the ladder 1 of figure 1 , so that reference numeral 2d is used here.
  • the rung 2d is made from an extruded aluminium tubular profile, the profile including a top wall 41, a bottom wall 42, as well as a front wall 43 and a rear wall 44 extending between the top wall and the bottom wall.
  • the front wall 41 here corresponds to the side on which the slidable actuators 10 are mounted. As can be seen in figure 1 the slidable actuators 10 are arranged on the front side of the rung.
  • top wall 41 is in cross section upwardly convex, whereas the bottom wall 42 is in cross section upwardly concave.
  • the curvature is identical so that in a design of the ladder wherein the rungs contact one another in collapsed state of the ladder (as is preferred) the top wall and bottom wall are in close contact (see figure 5 ). This provides stability of the ladder in said collapsed condition and avoids items entering in the space between the rungs.
  • the front wall has an elongated recessed portion 43a extending over the entire length thereof. This recessed portion is offset inwardly with respect to the above and below located edge portions 43b, c of the front wall 43.
  • the rear wall has a similar recessed portion 44a.
  • the front wall and rear wall are symmetrical. These recessed portions extend over a substantial portion of the height of the respective front and rear wall, between 15 and 25 millimetres. The depth may vary, and lies between 3 and 6 millimetres.
  • the rungs have a great stability, even when weakened by one or more holes or slots in a central region of the rung to accommodate one or more actuators for the latch mechanisms.
  • the upper surface of the top wall of the rung is preferably provided with a pattern of axial grooves/ribs to avoid slipping of the feet of a person climbing the ladder.
  • the slidable actuators 10 are arranged in said recessed portion 43a.
  • the slidable actuators 10 are arranged centrally on the front side of the rung 2d -9d so as to be operable simultaneously with a single hand.
  • each rung 2d is provided with two slots in the recessed portion 43a and each actuator 10 has a rear extension portion 11, which extends through a slot into the interior of the rung (see figure 7 ).
  • Each of said rear extension portions 11 is connected to an operating rod (partly shown in figure 10b with reference numeral 60) which extends inside said rung to the latch mechanism (not shown) at the outer end of the rung.
  • the slidable actuators 10 are not fully hidden within the recess, but protrude at the front of the rung between 1 and 4 millimetres. This is depicted in figure 7 showing a forward protrusion of 2 mm.
  • the actuators 10 are damaged by the feet of someone climbing or descending the ladder and/or during storage and transportation.
  • the manual slide actuators 10 are spaced apart at most 15 centimetres, more preferably at most 10 centimetres. This allows for easy single hand operation of both actuators 10 in a central portion of the rung, so that the operator or ladder user can use his or hers other hand for other purposes, e.g. holding the ladder stable by grabbing the ladder at a higher location than the actuators 10 to be operated for release of a ladder section.
  • the slidable actuators 10 have a height of between 15 and 25 millimetres.
  • the rear extension portions 11 of the actuators 10 preferably include a snap provision adapted to snap around the rod. This facilitates the assembly process of the ladder assembly.
  • FIGS 10a-d show a connector, here connector 2f, which connects a rung (such as rung 2d) at an end thereof to the upper end of a stile member (here 2a). It is noted that preferably all connectors of a ladder assembly are of generally the same design, albeit with dimensions adapted to the diameter of the stile member (as is shown in figure 1 and common for this field).
  • the connector 2f has a body (here of a unitary plastic design) having a rung portion 50, which is here -as is preferred - adapted to be inserted into the end of the rung and be fastened therein (e.g. by press fit or otherwise).
  • the connector body further includes a front collar segment 52 and a rear collar segment 54, these segments 52, 54 each being integral at one end thereof with the rung portion 50.
  • the two collar segments 52, 54 substantially encircle the stile member.
  • the collar segments 52, 54 have slightly spaced apart opposed ends and a fastener assembly is provided bridging the opposed ends of the collar segments for rigidly coupling the collar segments around the stile member.
  • the front collar segment 52 extends over angle of between 120 and 150 degrees, more preferably between 130 and 140 degrees, with respect to the longitudinal axis 55 of the rung, whereas the rear collar segment 54 extends over a complementary angle. In figures 10a-d the front collar segment extends over 135 degrees which is preferred.
  • the opposed ends of the collar segments are provided with a bore 56 through which a screw or bolt is fitted (not shown), the bore e.g. having at one end a recess for a bolt head and a nut being recessed in the opposed collar segment end.
  • the outer face of the collar segments 52, 54 - at the opposed ends thereof - form a substantially triangular protrusion 57 with respect to adjacent portions of the outer face of the collar segments (as can be seen in figures 10a,b ).
  • This protrusion 57 provides a body portion for accommodation of a fastener, such as a screw or a bolt, in a manner which is not laterally extending as with the Telesteps ladders. It has been found that this orientation of the split between the collar segments allows easy and accurate tensioning of the collar around the style, better than the known 180 degrees design and better and easier than the mentioned 90 degrees design of Core Distribution.
  • the body of the connector preferably is made of plastic material, preferably as a unitary body by injection moulding, preferably of fibre reinforced plastic material.
  • the body of the connector here includes a passage 58 for a locking pin 60 (which can form an extension of or be connected to the mentioned rod attached to the slide actuators 10) and allows to accommodate a spring 61 for biasing said locking pin 60 towards a locked position (commonly the stile member having an associated locking pin opening to receive said locking pin in extended state of the ladder section).
  • the automatic latch mechanisms of the inventive ladder each include a locking pin having a length which is sufficient for extending through a locking hole of the ladder section positioned there above and into the hollow space inside the stile member and the stile member having an extension below the locking hole, so that when an upper ladder section is released and telescopically inserted into an intermediate ladder section, which is locked in relation to a lower ladder section by the locking pin of the lower ladder section engaging the locking hole of the intermediate ladder section, the upper ladder section being stopped in a safety position from being fully inserted in the intermediate ladder section, by a safe distance, e.g. between 3 and 10 cm, by engagement of the extension of the lower ends of the stile members of the upper ladder section with the locking pins of the lower ladder section extending through the locking holes into the hollow space of the stile members of the intermediate ladder section.
  • a safe distance e.g. between 3 and 10 cm

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

Claims (3)

  1. Teleskopartig ausziehbare und zusammenklappbare Leiteranordnung (1), mit mindestens drei Leiterabschnitten (2-9), wobei jede der Leiterabschnitte zwei rohrförmige Holmelemente (2a, 2b) umfasst, die parallel zueinander angeordnet und miteinander an einem Ende durch eine Leitersprosse (2d, 9d) verbunden sind, um einen U-förmigen Leiterabschnitt zu bilden, wobei die Holmelemente jedes Leiterabschnitts teleskopartig in die Holmelemente eines benachbarten Leiterabschnitts eingeführt sind,
    wobei die Leiteranordnung ferner automatische Riegelmechanismen (60,61) an jedem Ende einer Leitersprosse zum Verriegeln der teleskopartig eingeführten Holmelemente relativ zueinander, wenn die Leiterabschnitte ausgefahren sind, umfasst, wobei die Riegelmechanismen jeweils mit einem verschiebbaren Stellglied (10) zum Entriegeln der Holmelemente ausgestattet sind, um die Holmelemente zu entriegeln, um ein Zusammenschieben der Leiteranordnung zu ermöglichen,
    wobei die Leitersprossen (2d-9d) aus einem extrudierten Aluminiumrohrprofil hergestellt sind, wobei das Profil sowohl eine obere Wand (41) und eine untere Wand (42) als auch eine vordere Wand (43) und eine Rückwand (44) aufweist, die sich zwischen der oberen Wand und der unteren Wand erstrecken, wobei die vordere Wand und die Rückwand symmetrisch sind,
    wobei die Stellglieder (10) an der vorderen Seite der Sprosse angeordnet sind, wobei die vordere Wand (43) der Sprosse einen länglich vertieften Abschnitt (43a) aufweist, der sich über die gesamte Länge davon erstreckt und unterhalb und nach innen von einem oberhalb befindlichen Kantenabschnitts (43b) der vorderen Wand versetzt angeordnet ist,
    wobei die Stellglieder (10) in dem vertieften Abschnitt (43a) angeordnet sind, wobei sich jedes Stellglied (10) durch einen Schlitz in der vorderen Wand in das Innere der Sprosse erstreckt, wobei jedes der Stellglieder mit einer Betätigungsstange (60) verbunden ist, welche sich innerhalb der Sprosse zu dem Riegelmechanismus (60, 61) an dem äußeren Ende der Sprosse erstreckt,
    dadurch gekennzeichnet,
    dass die Stellglieder (10) zentral an der vorderen Seite der Sprosse angeordnet sind, so dass sie gleichzeitig mit einer Hand bedienbar sind, und
    dass jede vordere Wand (43) und jede Rückwand (44) einen Randbereich (43c) unterhalb der länglich vertieften Abschnitte (43a, 44a) aufweist, wobei die vertieften Abschnitte auch in Bezug zu dem unterhalb befindlichen Randbereich (43c) der jeweiligen Wand (43, 44) nach innen versetzt sind, und
    dass sich die länglich vertieften Abschnitte (43a, 44a) über einen wesentlichen Teil der Höhe der jeweiligen vorderen Wand und Rückwand erstrecken, wobei der Teil zwischen 15 und 25 Millimeter hoch ist, und
    dass die verschiebbaren Stellglieder (10) eine Höhe zwischen 15 und 25 Millimeter haben, und
    dass länglich vertiefte Abschnitte (43a, 44a) eine Tiefe haben, die zwischen 3 und 6 Millimetern liegt, und
    dass verschiebbare Stellglieder (10) an der Vorderseite der Sprosse zwischen 1 und 4 Millimetern hervorstehen.
  2. Leiteranordnung nach Anspruch 1, wobei die Leitersprosse (2d-9d) eine obere Wand (41) aufweist, die im Querschnitt nach oben konvex ist, während die untere Wand (42) im Querschnitt nach oben konkav ist.
  3. Leiteranordnung nach Anspruch 2, wobei die Krümmung der oberen Wand (41) und der unteren Wand (42) gleich ist, und wobei die Leiter so ausgebildet ist, dass die Sprossen sich in dem zusammengeschobenen Zustand berühren.
EP08705071.2A 2007-11-02 2008-01-30 Teleskopleiteranordnung Active EP2215323B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15188391.5A EP2998501B8 (de) 2007-11-02 2008-01-30 Teleskopische leiteranordnung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1034629 2007-11-02
PCT/NL2008/000033 WO2009057995A1 (en) 2007-11-02 2008-01-30 A telescopic ladder assembly

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP15188391.5A Division EP2998501B8 (de) 2007-11-02 2008-01-30 Teleskopische leiteranordnung

Publications (2)

Publication Number Publication Date
EP2215323A1 EP2215323A1 (de) 2010-08-11
EP2215323B1 true EP2215323B1 (de) 2015-10-07

Family

ID=39684326

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15188391.5A Active EP2998501B8 (de) 2007-11-02 2008-01-30 Teleskopische leiteranordnung
EP08705071.2A Active EP2215323B1 (de) 2007-11-02 2008-01-30 Teleskopleiteranordnung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15188391.5A Active EP2998501B8 (de) 2007-11-02 2008-01-30 Teleskopische leiteranordnung

Country Status (3)

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EP (2) EP2998501B8 (de)
CN (2) CN102168521B (de)
WO (1) WO2009057995A1 (de)

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
US8225906B2 (en) 2008-08-22 2012-07-24 Core Distribution, Inc. Extendable/retractable ladder
JP5753849B2 (ja) 2009-10-07 2015-07-22 ランペ・ホールディングス・ベー・フェー スタンドオフ装置を備えている携行式ラダー
CN102140872A (zh) * 2011-03-05 2011-08-03 宁波超腾照明电器有限公司 一种气阻缓降自动收拢的安全伸缩梯
CN102733751B (zh) * 2012-06-26 2015-02-25 宁波兴富工具有限公司 防夹手的安全伸缩梯
FR3006361B1 (fr) 2013-05-29 2015-05-15 Zhuhai Quan Da Industry Commerce Co Ltd Echelle telescopique
CN107075905B (zh) * 2014-08-18 2019-06-21 兰普控股私人有限公司 伸缩梯子组件
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
CN112459698B (zh) * 2014-12-02 2022-01-11 科尔分配股份有限公司 可折叠梯子
US10233692B2 (en) 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US9580959B2 (en) 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
CN206129129U (zh) * 2016-08-31 2017-04-26 东莞威信运动用品有限公司 伸缩管缓冲导向结构
WO2018088906A1 (en) * 2016-11-14 2018-05-17 Lampe Holding B.V. Telescopic ladder assembly
MX2020004764A (es) 2017-11-08 2020-10-28 Core Distrib Inc Ensamble de bloqueo para una escalera telescopica.
SE544747C2 (en) * 2018-10-17 2022-11-01 Telesteps Ab A stabiliser system for a collapsible ladder
US11795760B2 (en) 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system
WO2023101584A1 (en) * 2021-12-02 2023-06-08 Telesteps Ab A damping device and an asymmetric damping block adapted to be arranged in a damping device for a collapsible ladder, a collapsible ladder and a method for arranging a damping device in a collapsible ladder

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US5944141A (en) * 1995-09-19 1999-08-31 Gerald R. Kendall And Edward J. Green Foldable ladder

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US1712942A (en) * 1927-12-29 1929-05-14 Hiram K Smith Collapsible ladder
US4574918A (en) * 1982-01-21 1986-03-11 Andral Corporation Ladder locking mechanism
EP0527766B1 (de) 1990-04-10 1996-06-05 Bertschi, Bruno Zusammenlegbare leiter
GB2263932B (en) 1992-02-01 1995-06-28 Telesteps Limited Loft ladder
DE69502590T2 (de) 1994-03-01 1999-01-07 Foxdale Dev Ltd Ausfahrbare leiter
US5645140A (en) * 1995-05-08 1997-07-08 Mouneimneh; Ghassoub A. Self-supported collapsible ladder
US5743355A (en) * 1996-07-31 1998-04-28 Mcdonnell; Charles A. Retractable ladder
IT1320835B1 (it) * 2000-11-14 2003-12-10 Campagnolo Srl Fascetta di serraggio per il reggi-sella di una bicicletta.
SE523253C2 (sv) * 2001-06-13 2004-04-06 Telesteps Ab Hopfällbar stege
US6708800B2 (en) 2002-08-02 2004-03-23 Core Distribution, Inc. Extending ladder and associated manufacturing methods
EP1971747B1 (de) 2005-12-30 2010-06-30 Core Distribution, Inc. Ergonomische ausziehbare/einziehbare leiter
US20070209875A1 (en) * 2006-03-10 2007-09-13 Mua-Mei Chen Securing device for extending ladder
GB2436584B (en) * 2006-03-30 2011-08-31 Norman William Liefke An extension ladder with improved mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5944141A (en) * 1995-09-19 1999-08-31 Gerald R. Kendall And Edward J. Green Foldable ladder

Also Published As

Publication number Publication date
EP2998501A1 (de) 2016-03-23
EP2998501B8 (de) 2018-12-26
CN102168521B (zh) 2013-07-31
EP2998501B1 (de) 2018-10-10
CN102168521A (zh) 2011-08-31
WO2009057995A1 (en) 2009-05-07
CN101918671B (zh) 2012-11-07
EP2215323A1 (de) 2010-08-11
CN101918671A (zh) 2010-12-15

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