EP1843005A1 - Sperreinrichtung für eine Leiter - Google Patents

Sperreinrichtung für eine Leiter Download PDF

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Publication number
EP1843005A1
EP1843005A1 EP06112308A EP06112308A EP1843005A1 EP 1843005 A1 EP1843005 A1 EP 1843005A1 EP 06112308 A EP06112308 A EP 06112308A EP 06112308 A EP06112308 A EP 06112308A EP 1843005 A1 EP1843005 A1 EP 1843005A1
Authority
EP
European Patent Office
Prior art keywords
ladder
section
locking
bar
rung
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.)
Granted
Application number
EP06112308A
Other languages
English (en)
French (fr)
Other versions
EP1843005B1 (de
Inventor
Per-Olof Eriksson
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
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
Priority to DE602006004305T priority Critical patent/DE602006004305D1/de
Application filed by Telesteps AB filed Critical Telesteps AB
Priority to DK06112308T priority patent/DK1843005T3/da
Priority to EP06112308A priority patent/EP1843005B1/de
Priority to AT06112308T priority patent/ATE417990T1/de
Priority to ES06112308T priority patent/ES2318673T3/es
Priority to CN2007800118162A priority patent/CN101415903B/zh
Priority to PCT/EP2007/053135 priority patent/WO2007115956A1/en
Publication of EP1843005A1 publication Critical patent/EP1843005A1/de
Priority to NO20084636A priority patent/NO339768B1/no
Application granted granted Critical
Publication of EP1843005B1 publication Critical patent/EP1843005B1/de
Priority to HK09106092.5A priority patent/HK1127106A1/xx
Not-in-force legal-status Critical Current
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
    • 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

Definitions

  • the present invention relates to a telescopic or collapsible ladder or stepladder of the type comprising U-shaped ladder sections being telescopically inserted in each other, and more specifically to a locking mechanism for such ladders.
  • Ladders having collapsible and expandable ladder sections are used in order to make the ladder smaller for storage and transport purposes.
  • the released ladder section and any other released ladder thereabove is held in position by the portion of the locking pin extending through the below positioned ladder section and distance between the ladder sections, the ladder sections roughly having a thickness of materia of 1,3 mm and the distance between the ladder sections being in the size of 0,1-0,2 mm. Since many users may climb on top of the ladder and stand on the released ladder sections and load the ladder with all their respective weight, the short portion of the locking pin may not be enough to withstand the exposed load. The below positioned ladder section may be released and cause the entire ladder to collapse and expose the user to a dangerous situation.
  • An object of the present invention is to provide a locking mechanism for telescopically collapsible ladders and stepladders, which enables the user to comfortably and safely use the ladder even though the ladder is partially released and collapsed.
  • the locking mechanism includes further safety means.
  • the locking mechanism is included in a collapsible ladder.
  • the locking mechanism is included in a collapsible stepladder.
  • a collapsible ladder 1 comprising ladder bars 2, 3 and rungs 6-14, respectively.
  • the rungs are arranged between the ladder bars 2, 3 and interconnect them.
  • the ladder bars 2, 3 are divided into sections 5 (see Fig. 2), which telescope into each other.
  • the bar sections 5 to the right and to the left form U-shaped ladder sections together with the rungs 6-14 connected at the top of the bar sections.
  • the lowermost ladder section 15 comprises a rung 7 and is also suitably provided at the bottom with a stationary rung 6, designed to provide an extra foot support and a more stable lowermost ladder section.
  • the rungs 6-14 are suitably made of an extruded aluminum profile.
  • Each rung 7-13 houses at each end a locking or retaining mechanism 41 (see Figs. 4-6), comprising a shell 21.
  • the shell 21 is inserted in the profile of the rung, e.g. by means of a press fit.
  • the rung 14 of the uppermost ladder section and the stationary rung 6 may lack a retaining mechanism 41.
  • a completely extended telescopic ladder 1 according to the invention is shown in Fig. 2 having actuators 40 on each of the rungs 7-13.
  • the actuators 40 arranged on the rung 7 may initiate the folding of the entire collapsible ladder, or the actuators 40 on each of the rungs 8-13 may be used to collapse or fold the ladder sections positioned above the respective rung 8-13.
  • Fig. 3 only three bar sections 5a, 5b, 5c are shown with a retaining mechanism only provided on the bar section 5a, whereas the rest of the ladder and the sections have been removed for clarity reasons.
  • the bar section 5c having the smaller diameter, telescopes into the bar section 5b, and the bar section 5b telescopes into the bar section 5a having the greater diameter.
  • Figs. 4-6 show a partial cross section of the bar sections 5a-5c along the line A-A. Every bar section 5, except the lowermost bar section, is provided with a damper 22 at its lower end. In Fig. 3 all ladder or bar sections 5 have been provided with dampers 22, but only the damper of bar section 5a is indicated. If the bar section 5a should be the lowermost bar it would not be provided with the damper 22.
  • the damper 22 serves to reduce the folding speed of the ladder as the bar section is lowered or collapsed by gravity.
  • the damper 22 is provided with an inclined surface 23.
  • the retaining mechanism 41 comprises a locking pin 24, which is received in a shell 21, where the shell 21 is press-fitted into a rung 7a, which corresponds to any of the rungs 7-13.
  • the locking pin 24 is displaceably mounted in the shell 21 and is in one end biased by a spring 25.
  • the locking pin 24 is provided with a waist or recess portion 26 in the mid portion of the locking pin 24 and a slot or slit 27 in the fore portion of the locking pin 24.
  • the waist or recess 26 serves to receive an actuator 40.
  • the actuator 40 is a rotary button and is pivotably mounted with a spindle 45 on the shell 21 and has a connecting part (fork-shaped) of the button 40 that clasps or jams about the waist or recess 26 of the locking pin 24.
  • the rotary button 40 which is roughly L-shaped, extends through a recess 43 of the bottom of the shell 21 projecting out of a recess on the underside face of the rung 7a. In a locking position (see Figs. 4 or 6), one of the legs of the rotary button projects obliquely out from the recess, whereas the other leg, e.g. having a fork-shaped and rounded end, grasps the recess portion 26 of the locking pin 24.
  • the locking pin 24 is furthermore provided with an end portion 33 opposite to the end portion biased by the spring 25.
  • the locking pin 24 interacts with a locking hole 34 of the bar section 5b to keep the extended position of the bar section 5b relative to the bar section 5a of the ladder.
  • the bar section 5b is provided with a second locking hole 34b located below the locking hole 34.
  • the second locking hole 34b serves to lock the bar section 5b in relation to another bar section after the bar section 5b has been collapsed. This will be described in detail below.
  • Fig. 6 it is shown how the locking pin 24 interacts with a second locking hole 34b of the bar section 5c to keep the collapsed bar section 5c in a fixed relation to the bar section 5a and 5b, respectively. It is also shown that the bar section 5c is provided with a locking hole 34, which is not use as the bar section 5c has been released and collapsed, and the locking pin 24 instead interacts with the below located second locking hole 34b of the bar section 5c.
  • Fig. 7 the upper part of the bar sections 5b and 5c are shown, where the rung 7c of the collapsed bar section 5c is located adjacently above the rung 7b of the bar section 5b.
  • the distance between the first locking hole 34 and the second locking hole 34b of each bar section corresponds to a height of a rung 7a-c, i.e. the distance between the upper side of the rung 7a-c and the under side of the rung 7a-c.
  • the ladder 1 can be provided with further ladder or bar sections located above the bar sections 5a-5c, and in Fig.7 another upper bar section 5d is shown as an example of that.
  • the user inactivates the retaining mechanism 41 of a bar section by withdrawing the locking pin 24 from the locking hole 34 by means of the actuator or rotary button 40 positioned on the underside of the rung 7 associated with the bar section.
  • the bar section 5c has been released by inactivating the retaining mechanism 41 (not shown) of the bar section 5b and has been lowered or collapsed a distance from its extended mode by gravity.
  • the inclined or chamfered surface 23 of the damper 22, arranged at the bottom end of the bar section 5c will interact with locking pin 24 of the bar section 5a so that the locking pin 24 will be pushed into shell 21. This enables the lower end of the bar section 5c to pass the locking pin 24 (see Fig. 5).
  • the bar section 5c would have been stopped by the locking pin 24 of the bar section 5a, and a safety distance would have been created between the rung 7c of the bar section 5c and the rung 7b of the bar section 5b. Now the bar section 5c will collapse further until the second or additional locking hole 34b of the bar section 5c reaches the locking pin 24 of the bar section 5a, whereby the locking pin 24 enters the second locking hole 34b and locks the bar section 5c in relation to both the bar section 5a and the bar section 5b, see Fig. 6.
  • the retaining mechanisms 41 and the rung 7c of the bar section 5c lie adjacently above the retaining mechanism 41 and the rung 7b of the bar section 5b, see Fig. 7.
  • the locking pin 24 will be withdrawn from the locking hole 34 of the bar section 5d by means of the rotary button 40, and the bar section 5d associated with the rung 7d positioned above the inactivated of released the bar section 5c and kept in position by the retaining mechanism 41 of bar section 5c and its associated rung 7c, is lowered/ collapsed by gravity.
  • the folding of the bar sections associated with the rung 7 positioned above the initially released bar section will be initiated.
  • the initiation of the folding of the bar sections associated with the rung 7 above the initially released bar section is due to the functionality of the retaining mechanism 41.
  • the retaining mechanism 41 of the upper positioned bar section is released when the rotary button 40 is pushed into the recess of the upper rung 7 by the lower rung 7, and thereby releases the retaining mechanism 41. This will be repeated until every bar section positioned above the actuator has been folded.
  • the telescopic ladder can also be provided with a third locking hole 34c on each bar section, see Figs. 3, 8 and 9, so that two collapsed bar sections 5c and 5d are locked in relation to two below located non-collapsed bar sections 5b and 5a by the retaining mechanism 41 of the bar section 5a.
  • the third locking hole 34c is positioned adjacently below the second locking hole 34b.
  • the function of the third locking hole 34c corresponds to the function of the second locking hole 34b.
  • a collapsible stepladder comprises a first and a second ladder leg.
  • the legs are hingedly connected to each other in one end, and each of the ladder legs can be seen as an individual collapsible ladder as the ladders shown in Figs. 1-2.

Landscapes

  • Ladders (AREA)
EP06112308A 2006-04-06 2006-04-06 Leiter mit einer Sperreinrichtung Not-in-force EP1843005B1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DK06112308T DK1843005T3 (da) 2006-04-06 2006-04-06 Stige med en låsemekanisme
EP06112308A EP1843005B1 (de) 2006-04-06 2006-04-06 Leiter mit einer Sperreinrichtung
AT06112308T ATE417990T1 (de) 2006-04-06 2006-04-06 Leiter mit einer sperreinrichtung
ES06112308T ES2318673T3 (es) 2006-04-06 2006-04-06 Escalera con mecanismo de inmovilizacion.
DE602006004305T DE602006004305D1 (de) 2006-04-06 2006-04-06 Leiter mit einer Sperreinrichtung
PCT/EP2007/053135 WO2007115956A1 (en) 2006-04-06 2007-04-02 Locking mechanism for a ladder
CN2007800118162A CN101415903B (zh) 2006-04-06 2007-04-02 用于梯子的锁紧机构
NO20084636A NO339768B1 (no) 2006-04-06 2008-11-04 Sammenskyvbar stige med låsemekanisme.
HK09106092.5A HK1127106A1 (en) 2006-04-06 2009-07-07 Locking mechanism for a ladder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06112308A EP1843005B1 (de) 2006-04-06 2006-04-06 Leiter mit einer Sperreinrichtung

Publications (2)

Publication Number Publication Date
EP1843005A1 true EP1843005A1 (de) 2007-10-10
EP1843005B1 EP1843005B1 (de) 2008-12-17

Family

ID=36969227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06112308A Not-in-force EP1843005B1 (de) 2006-04-06 2006-04-06 Leiter mit einer Sperreinrichtung

Country Status (9)

Country Link
EP (1) EP1843005B1 (de)
CN (1) CN101415903B (de)
AT (1) ATE417990T1 (de)
DE (1) DE602006004305D1 (de)
DK (1) DK1843005T3 (de)
ES (1) ES2318673T3 (de)
HK (1) HK1127106A1 (de)
NO (1) NO339768B1 (de)
WO (1) WO2007115956A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2008496C2 (en) * 2012-03-16 2013-09-18 Lampe Holding B V A telescopic ladder assembly.
CN106837153A (zh) * 2017-01-23 2017-06-13 国家电网公司 伸缩梯

Families Citing this family (5)

* 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
EP2971430B1 (de) 2013-03-11 2018-05-16 Patentselskabet af 10. december 2010 ApS Zusammenklappbare leiter
CN103573177B (zh) * 2013-11-25 2016-03-16 国家电网公司 10千伏标准化变压器台二次检修作业人员绝缘爬梯
JP7281122B2 (ja) * 2019-07-10 2023-05-25 長谷川工業株式会社 梯子体のロック構造、及び、梯子体
JP7513475B2 (ja) 2020-09-10 2024-07-09 アルインコ株式会社 高所作業装置の伸縮脚装置における安全確認装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0527766A1 (de) * 1990-04-10 1993-02-24 Safescape Ltd Zusammenlegbare leiter.
US5743355A (en) * 1996-07-31 1998-04-28 Mcdonnell; Charles A. Retractable ladder
US20040195043A1 (en) * 2001-06-13 2004-10-07 Kjell Johansson Collapsible ladder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2599203Y (zh) * 2003-01-24 2004-01-14 孙长军 伸缩梯

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0527766A1 (de) * 1990-04-10 1993-02-24 Safescape Ltd Zusammenlegbare leiter.
US5743355A (en) * 1996-07-31 1998-04-28 Mcdonnell; Charles A. Retractable ladder
US20040195043A1 (en) * 2001-06-13 2004-10-07 Kjell Johansson Collapsible ladder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2008496C2 (en) * 2012-03-16 2013-09-18 Lampe Holding B V A telescopic ladder assembly.
CN106837153A (zh) * 2017-01-23 2017-06-13 国家电网公司 伸缩梯

Also Published As

Publication number Publication date
NO20084636L (no) 2008-11-04
WO2007115956A1 (en) 2007-10-18
CN101415903B (zh) 2011-06-01
EP1843005B1 (de) 2008-12-17
NO339768B1 (no) 2017-01-30
DK1843005T3 (da) 2009-03-16
ATE417990T1 (de) 2009-01-15
CN101415903A (zh) 2009-04-22
HK1127106A1 (en) 2009-09-18
DE602006004305D1 (de) 2009-01-29
ES2318673T3 (es) 2009-05-01

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