EP2370656B1 - Reinforced collapsible ladder - Google Patents

Reinforced collapsible ladder Download PDF

Info

Publication number
EP2370656B1
EP2370656B1 EP09764509.7A EP09764509A EP2370656B1 EP 2370656 B1 EP2370656 B1 EP 2370656B1 EP 09764509 A EP09764509 A EP 09764509A EP 2370656 B1 EP2370656 B1 EP 2370656B1
Authority
EP
European Patent Office
Prior art keywords
ladder
stile
sections
section
pins
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
EP09764509.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2370656A1 (en
Inventor
Åke WINBLADH
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.)
Telesteps AB
Original Assignee
Telesteps AB
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Filing date
Publication date
Application filed by Telesteps AB filed Critical Telesteps AB
Publication of EP2370656A1 publication Critical patent/EP2370656A1/en
Application granted granted Critical
Publication of EP2370656B1 publication Critical patent/EP2370656B1/en
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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

Definitions

  • the present invention relates to a collapsible ladder comprising a number of stile sections interconnected by ladder steps to form U-shaped ladder sections, wherein adjacent stile sections have inner and outer diameters adapted to allow telescopic insertion into one another.
  • Collapsible ladders typically comprise two parallelly extending telescopically collapsible stiles interconnected by a number of ladder steps.
  • the ladder steps are often connected to the stiles in the top end of a section telescopically insertable into a lower section.
  • a ladder section of such a ladder comprises several U-shaped sections, the stanchions of the U being stile sections, and the bottom of the U being the ladder step.
  • the stile sections of an upper section fits within the stile sections of a lower section, and the upper stile section is held in place by a spring loaded pin arranged in the ladder step of the lower section's ladder step and extending through a hole provided in the upper stile section as the ladder is in an extended position.
  • the upper stile sections extend about 15 centimeters, or about half the distance between two adjacent ladder steps, past the lower ladder step when the ladder is in an extended position.
  • DE 27 50 535 A1 discloses a collapsible according to the preamble of claim 1 ladder having ladder sections each comprising two stile sections and three ladder steps. The upper of these ladder steps firmly connects the two stile sections and the remaining two ladder steps are loosely connecting the stile sections, such that the distance between the three ladder steps can be varied from when the ladder is in an extended position and when it is in a collapsed position.
  • a further type of locking mechanism (shown in DE 196 53 003 C2 ) comprises outwardly extending pins arranged in lower ends of the stile sections. Such pins cooperate with openings in the outer ladder pars section to lock the sections relative one another.
  • the object of the present invention is to provide a ladder having an increased stiffness, i.e. lower deflection, and an increased safety against inadvertent collapsing.
  • locking mechanisms may be placed in the ladder steps and may comprise a spring loaded pin adapted to lock at least one stile section inserted into a stile section adhering to the ladder step comprising the locking mechanism by cooperation with holes arranged in the at least one stile section.
  • a starting section comprising two starting stiles interconnected by an upper ladder step, an intermediate ladder step and a lower ladder step may be provided in order to leave room for the above ladder sections as the ladder is in a collapsed state.
  • locking mechanisms may be provided in the top ladder step.
  • locking mechanisms may be provided in the intermediate ladder step.
  • openings arranged to cooperate with the pins of the locking mechanism of the intermediate ladder step may be oblong to allow a certain movement without the pin being retracted.
  • the locking mechanisms may comprise levers connected to withdraw the spring loaded pins upon engagement with an adjacent ladder step.
  • a collapsible ladder 100 according to one embodiment of the present invention is shown.
  • the ladder steps 110a-c are firmly connected to two starting stiles, or ladder bars, 120a, 120b.
  • the ladder steps 110a-c and the two starting stiles 120a, 120b form a ladder like base section 120.
  • the rung 110c is provided with locking means 111, 114, which each comprise a pin 112a, which is spring-biased towards an extended position.
  • the pins 112a can be retracted, in the shown embodiment by pulling rings 111, 113.
  • a first collapsible section 130 comprises the ladder step 110 d, which is firmly connected to upper ends of two stile sections 130a, 130b to form a U-shaped ladder section.
  • the stile sections 130a, 130b are inserted into the starting stiles 120a, 120b.
  • At lower ends of the stile sections 130a, 130b dampers 140a, 140b are fastened.
  • the stile sections 130a, 130b extend within the starting stiles past both the ladder step 110c and the ladder step 110b.
  • the stile sections 130a, 130b are held in place by interaction between holes (not shown) in the stile sections 130a, 130b and the pins 112a, 112b.
  • Fig. 3 wherein a portion of the ladder 100 is shown in an extended position and a ladder section comprising stile sections 130a, 130b and ladder step 110d is shown besides the ladder 100.
  • a second collapsible section 150 comprises the ladder step 110e, which is connected to upper ends of stile sections 150a, 150b.
  • the stile sections 150a, 150b extend into the stile sections 130a, 130b, past the ladder steps 110d and 110c.
  • the stile sections 150a, 150b are held in place both by interaction between holes engaged by the pins 112a and 112b, and by holes engaged by pins 142a, 142b, respectively.
  • the pins 112a, 112b can be withdrawn from interaction with the holes in the stile sections 130a, 130b and the stile sections 150a, 150b by pulling the rings 111, 113, whereas the pins 142a, 142b can be disengaged from interaction with the holes provided in the stile sections 150a, 150b by interaction between levers 143a, 143b and the ladder step 110c.
  • a user may pull the rings 111, 113.
  • This pulling of the rings will, as mentioned above, impart a retracting movement of the pins 112a, 112b, which movement will disengage the pins 112a, 112b from the holes provided in the stile sections 130a, 130b, 150a and 150b.
  • the stile sections 130a, 130b will then be free to move into the starting stiles 120a, 120b.
  • the stile sections 150a, 150b will not be released from the stile sections 130a, 130b, since they are held in place by interaction between the pins 142a, 142b and the holes aligned with those pins. Consequently, the only stile sections being initially released by the pulling of the rings 111, 113 are the stile sections 130a, 130b.
  • the stile sections 130a, 130b will move into the starting stiles 120a, a20b, for example by the force of gravity.
  • the ladder step 110c will contact the levers 143a, 143b, hence withdrawing the pins 142a, 142b from engagement with the corresponding holes of the stile sections 150a, 150b.
  • the withdrawal of the pins 142a, 142b from the corresponding holes of the stile sections 150a, 150b will release the stile sections 150a, 150b.
  • One important feature with the ladder according to the present invention is that the risk of collapsing the ladder by accident has been reduced as compared to prior art ladders; on the prior art ladders, it is enough to maneuver the levers on a random ladder step for all above stile sections to collapse.
  • On a ladder according to the invention it is, however, not possible to collapse the ladder by maneuvering the levers on only one ladder step. Instead, the levers on two adjacent ladder steps must be maneuvered simultaneously in order for the ladder to collapse. This is, however, not the case for the rings 111, 113, since such rings are connected to the pins 112a, 112b, which are the only pins to lock the stile sections 130a, 130b.
  • Fig. 2 three ladder steps 110n, 110m, 1101 and their corresponding stile sections 170n, 170m and 1701 are shown in an enlarged scale. Also, a damper 173 and level actuators 143m, 1431 connected to pins 142m, 1421 are shown. As can be seen in this figure, the stile section 170n extends past both pins 142m and 1421, i.e. the length of the stile sections is larger than twice the distance between two ladder steps when the ladder is in an extended state.
  • locking mechanisms each comprising a pin, some kind of mechanism designed to withdraw the pin and a hole in the stile sections 130a, 130b can be arranged in the ladder step 110b.
  • a mechanism By providing such a mechanism, inadvertent collapsing of the ladder section 130 by withdrawing the pins 112a and 112b can be avoided, since actuation of either the pins located in the ladder step 110b or the pins 112a, 112b will not cause the stile section 130, 130b to be released from the starting stiles 120a, 120b; only simultaneous withdrawal of the pins 112a, 112b and the pins located in the ladder step 110b will release the stile sections 130a, 130b.
  • the holes located in the stile sections 130a, 130b that are positioned for engagement with the pins located in the ladder step 110b are oblong, such that a certain movement between the stile sections 130a, 130b and the starting stiles 120, 120b is allowed without the pin being withdrawn.
  • the stile sections 130a, 130b are able to move a certain distance into the starting stiles 120a, 120b. This movement will cause the holes corresponding to the pins 112a, 112b to moved off-center compared to the pins 112a, 112b, and as a result, the pins will not engage the holes after the withdrawing force has been released, and the spring urges the pin towards the stile sections 130a, 130b.
  • the pins located in the ladder step 110b is withdrawn, after which the stile sections 130a, 130b are released such that they may be fully inserted into the starting sections. After the stile sections 130a, 130b have been fully inserted, the above ladder sections will be released in the same manner as described above.
  • the stile sections are provided with locking mechanisms protruding outwards, i.e. a pin of the locking mechanism protrudes from a stile section located within a larger stile section through an opening in the larger stile section.
  • a locking system can be found in e.g. DE 196 53 003 C2 .
  • openings must be arranged in both stile sections wherever three ladder sections overlap one another. This makes a ladder according to this embodiment just as safe against inadvertent collapsing as any of the previously described embodiments.

Landscapes

  • Ladders (AREA)
EP09764509.7A 2008-12-02 2009-12-02 Reinforced collapsible ladder Active EP2370656B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0850113 2008-12-02
PCT/EP2009/066266 WO2010063772A1 (en) 2008-12-02 2009-12-02 Reinforced collapsible ladder

Publications (2)

Publication Number Publication Date
EP2370656A1 EP2370656A1 (en) 2011-10-05
EP2370656B1 true EP2370656B1 (en) 2013-10-09

Family

ID=41531606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09764509.7A Active EP2370656B1 (en) 2008-12-02 2009-12-02 Reinforced collapsible ladder

Country Status (5)

Country Link
EP (1) EP2370656B1 (da)
CN (1) CN102227540A (da)
DK (1) DK2370656T3 (da)
ES (1) ES2440923T3 (da)
WO (1) WO2010063772A1 (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011051394U1 (de) * 2011-02-02 2011-10-13 Patentselskabet Af 10. December 2010 Aps Zusammenlegbare Leiter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1712942A (en) * 1927-12-29 1929-05-14 Hiram K Smith Collapsible ladder
US4119177A (en) * 1977-11-10 1978-10-10 Bengt Heimer Andersson Collapsible ladder
DE2750535A1 (de) * 1977-11-11 1979-05-17 Heimer Andersson Verlaengerungsleiter
CN2610056Y (zh) * 2003-04-08 2004-04-07 钱贤平 一种可伸缩的梯子
DE602005003932T2 (de) * 2005-06-01 2008-12-18 Telesteps Ab Zusammenschiebbare Leiter mit Verriegelungsvorrichtung
CN101050687B (zh) * 2007-05-22 2011-02-23 王克诚 可伸缩梯子及其直立组合式梯子、平台高凳和人字梯
CN201087692Y (zh) * 2007-08-16 2008-07-16 梁国耀 多功能折叠梯的连接件

Also Published As

Publication number Publication date
DK2370656T3 (da) 2014-01-20
EP2370656A1 (en) 2011-10-05
CN102227540A (zh) 2011-10-26
ES2440923T3 (es) 2014-01-31
WO2010063772A1 (en) 2010-06-10

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