EP1816312B1 - Dispositif de sécurisation pour échelle à coulisse - Google Patents

Dispositif de sécurisation pour échelle à coulisse Download PDF

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Publication number
EP1816312B1
EP1816312B1 EP06026778A EP06026778A EP1816312B1 EP 1816312 B1 EP1816312 B1 EP 1816312B1 EP 06026778 A EP06026778 A EP 06026778A EP 06026778 A EP06026778 A EP 06026778A EP 1816312 B1 EP1816312 B1 EP 1816312B1
Authority
EP
European Patent Office
Prior art keywords
tubes
ladder
hole
tube
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.)
Not-in-force
Application number
EP06026778A
Other languages
German (de)
English (en)
Other versions
EP1816312A2 (fr
EP1816312A3 (fr
Inventor
Mei-Hua Chen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1816312A2 publication Critical patent/EP1816312A2/fr
Publication of EP1816312A3 publication Critical patent/EP1816312A3/fr
Application granted granted Critical
Publication of EP1816312B1 publication Critical patent/EP1816312B1/fr
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
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/06—Securing devices or hooks for parts of extensible ladders

Definitions

  • the present invention relates to an extending ladder which includes several rung units and each unit includes two buttons for releasing or securing the two columns relative to another rung unit.
  • a conventional ladder includes two columns which are usually parallel to each other and rungs are connected between the two columns. The rungs are fixed to the columns so that the ladder is bulky and inconvenient for storage.
  • Two extending ladders are known to applicant and disclosed in U.S. Patent No. 6,708,800 and U.S. Patent No. 6,883,645 .
  • the two extending ladders require the user to push two thumbs toward a center portion of the ladder to extend or collapse the ladder. If the travel of the movement of the thumbs are too short, then the ladder cannot be extended or collapsed, and this is obviously inconvenient for the users.
  • EP 1 516 999 relates to an extending ladder comprising ladders bars which telescope into each other.
  • Each ladder bar houses at each end a retaining mechanism comprising a shell and a rotary or slide button used as an actuator.
  • the use of such buttons does not make the retaining mechanism as safe as possible, since they can be easily actuated. This kind of ladder can thus be dangerous for the user.
  • the present invention intends to provide a safe ladder that requires the user to push two buttons to release the interlocking between the rung units which are then easily extended or collapsed.
  • the present invention relates to a ladder according to claim 1, which comprises two parallel columns and each column is composed of a plurality of hollow tubes which have gradually reduced outer diameter so that the tubes with small sizes can be telescopically receivable in the tubes with large sizes.
  • Each tube has an upper hole and a lower hole.
  • Each pair of the tubes have a rung connected therebetween and two connectors are connected between two ends of the rung and the two tubes.
  • Each connector has a mounting ring mounted on a top end of each tube and, an insertion inserted into one of the two ends of the rung.
  • a connection member is connected between the mounting ring and the insertion.
  • the connection member has a through hole is in alignment with the upper hole and communicates with the insertion and the mounting ring.
  • Each insertion has a controller received therein and the controller including a seat and a button.
  • the seat has a biasing member and a locking bar which is biased by the biasing member at one end thereof.
  • the locking bar is inserted into the through hole of the connection member and the upper hole of the tube.
  • a pin transversely extends through the locking bar.
  • the button has a curved head and two tongues extend from an side of the head and extend into the insertion so as to push the locking bar.
  • the rung has two apertures defined in a side of two ends thereof and the insertions are inserted into the two ends of the rung so that when the locking bars extend through the through holes of the connectors, the upper holes of the two tubes with large size and the lower holes of the tubes with small size, the ladder is extended and established.
  • the buttons are pushed, tongues shift the pins such that the locking bars are withdrawn from the lower holes of the tubes with small size, and the tubes with small sizes are telescopically received in the tubes of large sizes.
  • the ladder of the present invention is composed of composed of a plurality of rung units and each rung unit includes two hollow tubes 11 and a rung 3 connected therebetween.
  • the hollow tubes 11 form two parallel columns 1 and the hollow tubes 11 have gradually reduced outer diameter so that the tubes 11 with small sizes are telescopically receivable in the tubes 11 with large sizes as shown in Fig. 1 .
  • Each tube 11 has an upper hole 12 and a lower hole 13 defined through a wall of two ends thereof, and the upper holes 12 and the lower holes 13 in the two respective tubes 11 face each other.
  • Two connectors 2 are connected between two ends of the rung 3 and the two tubes 11.
  • a separation bar 18 is connected between the two tubes 11 with largest sizes to keep a stable width between the two columns 1.
  • Each connector 2 has a mounting ring 21 and an insertion 22, wherein the mounting ring 21 is mounted on a top end of each tube 11 and the insertion 22 is inserted into one of the two ends of the rung 3.
  • a connection member 23 is connected between the mounting ring 21 and the insertion 22.
  • a through hole 231 is defined in the connection member 23 and in alignment with the upper hole 12 so as to communicate with the insertion 22 and the mounting ring 21.
  • the connection member 23 has an L-shaped slot 232 which communicates with the mounting ring 21.
  • Two passages 233 are defined through the connection member 23 such that the through hole 231 is located between the two passages 233.
  • Two bolts 24 extend through the passages 233 and are connected to a reinforcement plate 241 so that the mounting ring 21 is fixed on the tube 11.
  • Each of the tubes 11 has a positioning hole 121 located close to the top end thereof and the mounting ring 21 has a positioning protrusion 211 extending from an inner periphery thereof so that the positioning protrusion
  • each of the tubes 11 has an inner bush 14 inserted in a top end thereof and the inner bush 14 has a flange 141 extending radially outward therefrom so as to be positioned between the mounting ring 21 and the tube 11.
  • the inner bush 14 has a notch 142 which is in alignment with the upper hole 12.
  • Each of the tubes 11 has an outer bush 15 and an outer collar 16 mounted to an outer periphery of a lower end of the tube 11.
  • the outer bush 15 and the outer collar 16 are located between the tube 11 with small size and the tube 11 with large size, and do not block the lower hole 13.
  • Each of the tubes 11 has an engaging hole 17 defined through a wall of the lower end thereof and the outer collar 16 has a boss 161 extending from an inner periphery thereof. The boss 161 is engaged with the engaging hole 17 such that the outer collar 16 is fixed on the tube 11.
  • Each insertion 22 has a controller 4 received therein and the controller 4 includes a seat 41 and a button 42.
  • the seat 41 includes a board 411, a biasing member 412 received in a box on the board 411 and a locking bar 413 which has one end inserted in the box via an open end of the box and is biased by the biasing member 412 at one end thereof.
  • the board 411 can be inserted in a groove 211 defined in an underside of the insertion 22 so as to be securely connected to the insertion 22.
  • the locking bar 413 is inserted into the through hole 231 of the connection member 23 and the upper hole 12 of the tube 11.
  • a pin 414 transversely extends through the locking bar 413.
  • the button 42 has a curved head 421 which has a stepped surface 422 and two tongues 423 extend from an side of the head 421 and into the insertion 22.
  • Each of the tongues 423 has an inclined section which pushes the locking bar 413 when the button 42 is pushed.
  • the rung 3 has two apertures 31 defined in a side of two ends thereof and the insertions 22 are inserted into the two ends of the rung 3 and the heads 421 project from the apertures 31.
  • the stepped surface 422 of each button 42 is engaged with an inside of the aperture 31 corresponding thereto.
  • the ladder can be easily collapsed or extended by pushing the two buttons 42 to move the locking bars 413.
  • the tubes 11 can be made by a first material, and the inner bushes 14, the outer bushes 15 and the outer collars 16 can be made by a second material.
  • the first material can be aluminum alloy and the second material can be composite material.

Landscapes

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

Claims (12)

  1. Echelle comprenant :
    deux montants parallèles (1), chaque montant (1) étant composé d'une pluralité de tubes creux (11) dont le diamètre extérieur diminue progressivement de sorte que les tubes (11) de petite taille peuvent être reçus de façon télescopique dans les tubes (11) de grande taille, chaque tube ayant un trou supérieur (12) et un trou inférieur (13) défini à travers une paroi de deux extrémités de celui-ci, les trous supérieurs (12) et les trous inférieurs (13) des tubes (11) des deux montants (1) étant en face les uns des autres, chaque paire de tubes (11) comportant un barreau (3) connecté entre eux et deux connecteurs (2) connectés entre deux extrémités du barreau (3) et les deux tubes (11) ;
    chaque connecteur (2) ayant une bague de montage (21) montée sur une extrémité supérieure de chaque tube (11) et une pièce d'insertion (22) insérée dans l'une des deux extrémités du barreau (3), un élément de connexion (23) connecté entre la bague de montage (21) et la pièce d'insertion (22), l'élément de connexion (23) ayant un trou traversant (231) qui est aligné avec le trou supérieur (12) afin de communiquer avec la pièce d'insertion (22) et la bague de montage (21) ;
    chaque pièce d'insertion (22) comportant un dispositif de réglage (4) logé dans celle-ci et le dispositif de réglage (4) comprenant un siège (41) et un bouton (42), le siège (41) comportant un élément de sollicitation (412) et un axe de blocage (413) qui est poussé par l'élément de sollicitation (412) à l'une de ses extrémités, l'axe de blocage (413) étant inséré dans le trou traversant (231) de l'élément de connexion (23) et dans le trou supérieur (12) du tube (11), une clavette (414) s'étendant transversalement à travers l'axe de blocage (413) ;
    le bouton (42) ayant une tête courbée (421) qui a une surface étagée (422), deux languettes (423) s'étendant depuis un côté de la tête (421) et s'étendant dans la pièce d'insertion (22) de sorte que lorsque les boutons (42) sont poussés, les deux languettes (423) décalent la clavette (414), l'axe de blocage (413) est tiré du trou inférieur (13), et le barreau (3) comportant deux ouvertures (31) définies dans un côté de ses deux extrémités, les pièces d'insertion (22) étant insérées dans les deux extrémités du barreau (3) et les têtes (421) faisant saillie depuis les ouvertures (31), la surface étagée (422) de chaque bouton (42) étant en prise avec l'intérieur de l'ouverture (31) correspondante.
  2. Echelle selon la revendication 1, dans laquelle chacun des tubes (11) comporte une douille intérieure (14) insérée dans une extrémité supérieure de celle-ci et la douille intérieure (14) comporte une bride (141) s'étendant radialement vers l'extérieur depuis celle-ci afin d'être positionnée entre la bague de montage (21) et le tube (11), la douille intérieure (14) comportant une encoche (142) qui est alignée avec le trou supérieur (12).
  3. Echelle selon la revendication 1, dans laquelle chacun des tubes (11) comporte une douille extérieure (15) et un collier extérieur (16) monté sur une périphérie extérieure d'une extrémité inférieure du tube (11), la douille extérieure (15) et le collier extérieur (16) étant placés entre le tube (11) de petite taille et le tube (11) de grande taille sans bloquer le trou inférieur (13).
  4. Echelle selon la revendication 3, dans laquelle chacun des tubes (11) comporte un trou d'engagement (17) défini à travers une paroi de l'extrémité inférieure de celui-ci et le collier extérieur (16) comporte un ergot (161) s'étendant depuis une périphérie intérieure de celui-ci, l'ergot (161) s'engageant dans le trou d'engagement (17) de manière telle que le collier extérieur (16) est fixé sur le tube (11).
  5. Echelle selon la revendication 1, dans laquelle chacun des tubes (11) comporte un trou de positionnement (121) situé près de l'extrémité supérieure de celui-ci, la bague de montage (21) comporte une protubérance de positionnement (211) s'étendant depuis une périphérie intérieure de celle-ci, la protubérance de positionnement (211) étant en prise avec le trou de positionnement (121).
  6. Echelle selon la revendication 1, dans laquelle l'élément de connexion (23) de chacun des connecteurs (2) comporte une fente en forme de L (232) qui communique avec la bague de montage (21), deux passages (233) sont définis à travers l'élément de connexion (23) de telle manière que le trou traversant (231) est situé entre les deux passages (233), deux boulons (24) s'étendent dans les passages (233) et sont connectés à une plaque de renforcement (241) de telle manière que la bague de montage (21) est fixée sur le tube (11).
  7. Echelle selon la revendication 1, dans laquelle le bouton (42) de chaque dispositif de réglage (4) a un deuxième élément de sollicitation (424) logé dans la tête (421) afin de faire revenir le bouton (42) dans sa position d'origine.
  8. Echelle selon la revendication 1, dans laquelle une barre de séparation (18) est connectée entre les deux tubes (11) de plus grande taille.
  9. Echelle selon la revendication 1, dans laquelle les tubes (11) sont faits d'un premier matériau, les douilles intérieures (14), les douilles extérieures (15) et les colliers extérieurs (16) sont faits d'un second matériau.
  10. Echelle selon la revendication 9, dans laquelle le premier matériau est un alliage d'aluminium et le second matériau est un matériau composite.
  11. Echelle selon la revendication 1, dans laquelle un corps (411) du siège (41) comprend un boîtier ayant une extrémité ouverte et l'élément de sollicitation (412) est logé dans le boîtier, l'extrémité de l'axe de blocage (413) est insérée dans le boîtier par l'extrémité ouverte et poussée par l'élément de sollicitation (412).
  12. Echelle selon la revendication 1, dans laquelle une rainure (211) est définie dans une face inférieure de la pièce d'insertion (22) et un corps (411) du siège (41) est inséré dans la rainure (211).
EP06026778A 2006-02-07 2006-12-22 Dispositif de sécurisation pour échelle à coulisse Not-in-force EP1816312B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2006200015385U CN2876303Y (zh) 2006-02-07 2006-02-07 按压式伸缩梯

Publications (3)

Publication Number Publication Date
EP1816312A2 EP1816312A2 (fr) 2007-08-08
EP1816312A3 EP1816312A3 (fr) 2009-03-18
EP1816312B1 true EP1816312B1 (fr) 2010-04-14

Family

ID=37819540

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06026778A Not-in-force EP1816312B1 (fr) 2006-02-07 2006-12-22 Dispositif de sécurisation pour échelle à coulisse

Country Status (4)

Country Link
EP (1) EP1816312B1 (fr)
CN (1) CN2876303Y (fr)
AT (1) ATE464454T1 (fr)
DE (1) DE602006013589D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8225906B2 (en) 2008-08-22 2012-07-24 Core Distribution, Inc. Extendable/retractable ladder
EP2343433B1 (fr) * 2008-09-25 2017-05-31 Kuo, Chingyao Échelle télescopique
US10233692B2 (en) 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
CA3081574C (fr) 2017-11-08 2021-11-02 Core Distribution, Inc. Ensemble de verrouillage pour une echelle telescopique
CN109826554A (zh) * 2019-04-08 2019-05-31 黄崇华 伸缩梯
US11795760B2 (en) 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN2674056Y (zh) * 2003-12-03 2005-01-26 郭晶耀 伸缩梯结构

Also Published As

Publication number Publication date
EP1816312A2 (fr) 2007-08-08
DE602006013589D1 (de) 2010-05-27
EP1816312A3 (fr) 2009-03-18
CN2876303Y (zh) 2007-03-07
ATE464454T1 (de) 2010-04-15

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