EP2322752A1 - Erweiterbare leiter - Google Patents

Erweiterbare leiter Download PDF

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Publication number
EP2322752A1
EP2322752A1 EP09806287A EP09806287A EP2322752A1 EP 2322752 A1 EP2322752 A1 EP 2322752A1 EP 09806287 A EP09806287 A EP 09806287A EP 09806287 A EP09806287 A EP 09806287A EP 2322752 A1 EP2322752 A1 EP 2322752A1
Authority
EP
European Patent Office
Prior art keywords
rung
column
pin
disposed
ladder
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
EP09806287A
Other languages
English (en)
French (fr)
Other versions
EP2322752B1 (de
EP2322752A4 (de
Inventor
Wanxing Wang
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.)
Ningbo Xingfu Tools Co Ltd
Original Assignee
Ningbo Xingfu Tools Co Ltd
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 Ningbo Xingfu Tools Co Ltd filed Critical Ningbo Xingfu Tools Co Ltd
Publication of EP2322752A1 publication Critical patent/EP2322752A1/de
Publication of EP2322752A4 publication Critical patent/EP2322752A4/de
Application granted granted Critical
Publication of EP2322752B1 publication Critical patent/EP2322752B1/de
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 a ladder, in particular to an extending ladder including a plurality of stiles disposed in a nested arrangement and being able to slip relatively.
  • the ladder should usually be used, when the residences, apartments, farms, factories or other places are being repaired or maintained. While the ladder should be stored up when it is not be used. A longer ladder can reach a higher height but it is not convenient to be transported and it will take up more space when the ladder should be stored up. While, an extending ladder can be extended when being used and can be collapsed when being stored up.
  • European Patent EP0527766B1 discloses an extending ladder with a similar structure, which comprises:
  • the patent provides a ladder having the function of automatic collapsed from bottom to top. Once the two rungs at the utmost bottom are collapsed, the third rung ranking from bottom to top will be collapsed automatically, and so on until the rung at the top is collapsed automatically in the same manner. However, in the meanwhile, such function will result in the unsafe usage and seem to cause accidents, especially to the damage caused by the pressure of the rung. During the usage of the ladder, if a third party unintentionally touches the switch of the most bottom rung, all of the rungs will then collapse automatically, thus it is highly possible to make the user who stands on the rung to fall down and be harmed.
  • an existing extending ladder will be safe all the better when being used, which will be completely collapsed only if the button on each rung is pressed one rung at a time.
  • US Patent US7048094B2 also discloses a convenient and safe extending ladder, which comprises:
  • the most prominent characters are the 'button' and the 'sleeve', and the main object is to make the button control more convenient and reduce the degree of the friction and the abrasion between two adjacent columns.
  • each rung is equipped with two buttons arranged respectively at both ends of the rung. So that, when the user operates the latch mechanism, his two hands should hold the first stile and the second stile and his two thumbs should simultaneously respectively touch the two buttons on each rung, in other words, a pair of hands must be used to operate the two buttons simultaneously and successfully.
  • the practical application shows that such operating manner is still inconvenient.
  • the second object of the present invention is to provide an extending ladder, which can prevent the upper column from breaking away from the next lower column when the columns are pulled up quickly, and can remind the user whether the columns are pulled in right position.
  • the extending ladder comprising:
  • the left latch mechanism can also comprises:
  • latch mechanism is provided with fewer component, so such latch mechanism is in simple structure.
  • left and right latch mechanism can also be applied with various latch manners used in the existing extending ladders.
  • a first spring seat can be provided on the left side of the interior of the rung, which the left pin can movably pass through, the first spring is disposed in the first spring seat with one end against the inner wall of the right side of the first spring seat and the other end against a shoulder protruded at the middle of the left pin;
  • a second spring seat can be provided on the right side of the interior of the rung, which the right pin can movably pass through, the second spring is disposed in the second spring seat with one end against the inner wall of the left side of the second spring seat and the other end against a shoulder protruded at the middle of the right pin.
  • Said spring seats not only can contain the corresponding spring, but also can sustain the corresponding pin.
  • a left limiting block can be provided on the left side of the interior of the rung, which the left pin can movably pass through, and two stop rings are provided on the left pin in distance, which respectively locates at two sides of the left limiting block and can respectively be stopped by the surface of two sides of the left limiting block;
  • a right limiting block can be provided on the right side of the interior of the rung, which the right pin can movably pass through, and two stop rings are provided on the right pin in distance, which respectively locates at two sides of the right limiting block and can respectively be stopped by the surface of two sides of the right limiting block.
  • Said limiting block can limit the movement of the corresponding pin, so the left and right button can be well controlled to move within a proper scope.
  • the structure of the limiting the movement of the pin is not limited in the above stated structure, other prior technique can also be adopted.
  • the extending ladder can be improved as below:
  • the corresponding limiting annulation After the column is pulled upward to be in position, the corresponding limiting annulation will be stopped by the matched inner shoulder on the corresponding connector, then the column will be prevented from being pulling out further. Moreover, when the limiting annulation is stopped by the corresponding inner shoulder, that is the column can not be pulled upward easily, it will indicate that the column has been in right position and the user should stop pulling.
  • the limiting annulation limited on the corresponding column can adopt the manner as below:
  • Said limiting annulation can be limited at the middle of the column conveniently and stably.
  • a left bushing is mounted around the opening of the bottom of the left column, the exterior surface of the upper part of the left bushing is in contact with the inner wall of the next lower left column, and the exterior surface of the lower part of the left bushing is tapered; While a right bushing is mounted around the opening of the bottom of the right column, the exterior surface of the upper part of the right bushing is in contact with the inner wall of the next lower right column, and the exterior surface of the lower part of the right bushing is tapered.
  • the exterior surface of the upper part of the left or right bushing is respectively in contact with the inner wall of the next lower left or right column, adjacent columns can be damped when moves relatively and can be kept from moving relatively too fast, to avoid the damage of the rungs caused by the mutual clash between the adjacent rungs and reduce the noise caused by the mutual clash of the rungs.
  • the exterior surface of the lower part of the bushing is tapered, it is helpful for the user to insert the upper column into the next lower column when assembling.
  • the internal surface of the upper part of the left bushing is provided with a plurality of project, correspondingly, the peripheral of the bottom of the left column is provided with a plurality of location holes for the corresponding project to insert; While the internal surface of the upper part of the right bushing is provided with a plurality of projects, correspondingly, the peripheral of the bottom of the right column is provided with a plurality of location holes for the corresponding project to insert.
  • the bushing can be mounted on the bottom of the column. It makes the assembling much easy.
  • the right side of the left button can be provided with a resisting portion which is convenient for the fingertip to resist against, and the left side of the right button can also be provided with a resisting portion which is convenient for the fingertip to resist against. It can reduce the operating span of the fingers, it is helpful for the fingers to exert on the buttons when operating and it makes the operating more easily for the user.
  • the left and right buttons are adjacently arranged on the middle of each rung, so that two buttons can be operated with one hand simultaneously to unlock the rung relative to the corresponding left and right column.
  • the thumb and the index figure of the same hand have to be opened, the thumb touches the right button and the index figure touches the left button, then, two fingers drives the left and right buttons respectively to move closely and closely with inward force at the same time, to operate left and right latch mechanism and unlock the rung. Therefore, the operation is very convenient for the user. While the other hand can hold the columns and make the columns move downward. Accordingly, the clash between the adjacent rungs can be avoided and a stable operation process can be also ensured.
  • FIGS.1 ⁇ 18 show a preferable embodiment of the present invention.
  • the extending ladder comprises:
  • the left stile 1 is formed of telescopically collapsible left columns 11 which are disposed orderly in a nested arrangement for relative lengthwise movement in a telescopic fashion.
  • the right stile 2 is also formed of telescopically collapsible right columns 21 which are disposed orderly in a nested arrangement for relative lengthwise movement in a telescopic fashion.
  • the left columns 11 and the right columns 21 are in rough tubular shape.
  • Each rung 3 is mounted between the opposite two columns 11, 21. Each rung 3 is hollow and in rectangular figure.
  • a left latch mechanism 4 is disposed in each rung 3 for locking the upper left column 11 with the corresponding rung 3 when the ladder extending lengthwise, to keep the ladder from collapsing.
  • a right latch mechanism 5 is disposed in each rung 3 for locking the upper right column 21 with the corresponding rung 3 when the ladder extending lengthwise, to keep the ladder from collapsing.
  • the left latch mechanism 4 and the right latch mechanism 5 are respectively provided with a left button 6 and a right button 7 to operate the corresponding latch mechanism.
  • the left latch mechanism 4 also comprises:
  • the right latch mechanism 5 also comprises:
  • the left button 6 and the right button 7 are disposed closely with each other in the middle of the corresponding rung 3. That is, a left groove 31 and a right groove 32 are provided in the middle of the rung 3 respectively for the left button 6 and the right button 7 to pass though, the left button 6 and the right button 7 are respectively limited in the left groove 31 and the right groove 32 and can move breadthwise respectively relatively to the left groove 31 and the right groove 32. It makes two buttons 6, 7 be operated conveniently by single hand simultaneity to make the rung 3 released from the corresponding column 11; 21.
  • the right side of the left button 6 is provided with a resisting portion 61, which is convenient for the fingertip to resist against, and the left side of the right button 7 is also provided with a resisting portion 71 which is convenient for the fingertip to resist against.
  • a left limiting annulation 8 is mounted around of the periphery surface of the middle of the left column 11, which is sandwiched between two adjacent left columns 11, correspondingly, the left connector 41 is provided with an annular wall to form a socket 411 which is preferably dimensioned to tightly connect with the periphery of the top of the left column 11, an inner shoulder 412 protruding inward is formed on the top of the inner wall of the socket 411 to stop the left limiting annulation 8, and the left connector 41 is also provided with a through hole 413 communicating with the socket 411 for the left pin 42 to pass through.
  • the left limiting annulation 8 is provided with a first gap 81 opposite to the first locking hole 111, and the inner wall of the left limiting annulation 8 is provided with a plurality of protrusions 82, correspondingly, the peripheral of the middle of the left column 11 is provided with a plurality of small holes 113 for the corresponding protrusion 82 to insert.
  • the right connector 51 is provided with an annular wall to form a socket 511 which is preferably dimensioned to tightly connect with the periphery of the top of the right column 21, an inner shoulder 512 protruding inward is formed on the top of the inner wall of the socket 511 to stop the right limiting annulation 9, and the right connector 51 is also provided with a through hole 513 communicating with the socket 511 for the right pin 52 to pass through.
  • the right limiting annulation 9 is provided with a second gap 91 opposite to the third locking hole 211, and the inner wall of the right limiting annulation 9 is provided with a plurality of protrusions 92, correspondingly, the peripheral of the middle of the right column 21 is provided with a plurality of small holes 213 for the corresponding protrusion 92 to insert.
  • a left bushing 10 is mounted around the opening of the bottom of the left column 11, the exterior surface 101 of the upper part of the left bushing 10 is in contact with the inner wall of the next lower left column 11, and the exterior surface 102 of the lower part of the left bushing 10 is tapered.
  • the internal surface of the upper part of the left bushing 10 is provided with a plurality of projects 103, correspondingly, the peripheral of the bottom of the left column 11 is provided with a plurality of location holes 114 for the corresponding project 103 to insert.
  • the internal surface of the upper part of the right bushing 12 is provided with a plurality of projects 123, correspondingly, the peripheral of the bottom of the right column 21 is provided with a plurality of location holes 214 for the corresponding project 123 to insert.
  • the locking process of the left column 11 is the same as the right column 21, and both processes are acting simultaneity.
  • the exterior surface of the upper part of the left or right bushing 10, 12 on the bottom of the corresponding column will respectively contact and make friction with the inner wall of the next lower left or right column, the left and right bushing 10, 12 have the function of friction drag, to keep the upper left and right column 11, 21 from moving too fast respectively relatively to the next lower left and right column 11, 21.
  • the damage of the rungs caused by the mutual clash between the adjacent rungs can be avoided and the noise caused by the mutual clash of the rungs can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP09806287.0A 2008-08-14 2009-07-14 Erweiterbare leiter Not-in-force EP2322752B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNU2008201627852U CN201250602Y (zh) 2008-08-14 2008-08-14 一种伸缩梯
PCT/CN2009/000792 WO2010017684A1 (zh) 2008-08-14 2009-07-14 一种伸缩梯

Publications (3)

Publication Number Publication Date
EP2322752A1 true EP2322752A1 (de) 2011-05-18
EP2322752A4 EP2322752A4 (de) 2012-09-12
EP2322752B1 EP2322752B1 (de) 2013-05-29

Family

ID=40746276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09806287.0A Not-in-force EP2322752B1 (de) 2008-08-14 2009-07-14 Erweiterbare leiter

Country Status (4)

Country Link
EP (1) EP2322752B1 (de)
CN (1) CN201250602Y (de)
DK (1) DK2322752T3 (de)
WO (1) WO2010017684A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018081786A1 (en) * 2016-10-31 2018-05-03 Horizon Global Americas Inc. Telescoping ramp

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101338649B (zh) * 2008-08-14 2011-02-09 王万兴 一种伸缩梯
CN201250602Y (zh) * 2008-08-14 2009-06-03 王万兴 一种伸缩梯
JP5897935B2 (ja) * 2012-03-02 2016-04-06 アルインコ株式会社 作業台の伸縮脚ロック装置

Family Cites Families (12)

* 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
GB8717884D0 (en) * 1987-07-28 1987-09-03 Baker M R E Folding ladders
ES2089208T3 (es) 1990-04-10 1996-10-01 Bertschi Bruno Escalera plegable.
GB9403863D0 (en) * 1994-03-01 1994-04-20 Foxdale Dev Ltd Extensible ladder
US6708800B2 (en) 2002-08-02 2004-03-23 Core Distribution, Inc. Extending ladder and associated manufacturing methods
CN2881052Y (zh) * 2006-02-08 2007-03-21 何海涛 伸缩梯
GB2436584B (en) * 2006-03-30 2011-08-31 Norman William Liefke An extension ladder with improved mechanism
US7967110B2 (en) * 2006-07-27 2011-06-28 Werner Co. Tubular access ladder and method
CN200971751Y (zh) * 2006-10-30 2007-11-07 范刚 一种伸缩梯的锁定装置
CN200985738Y (zh) * 2006-11-27 2007-12-05 苏正平 一种伸缩梯
CN201047247Y (zh) * 2007-04-23 2008-04-16 简世坤 一种伸缩梯
CN201250602Y (zh) * 2008-08-14 2009-06-03 王万兴 一种伸缩梯

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018081786A1 (en) * 2016-10-31 2018-05-03 Horizon Global Americas Inc. Telescoping ramp
US10207881B2 (en) 2016-10-31 2019-02-19 Horizon Global Americas Inc. Telescoping ramp

Also Published As

Publication number Publication date
CN201250602Y (zh) 2009-06-03
EP2322752B1 (de) 2013-05-29
WO2010017684A1 (zh) 2010-02-18
DK2322752T3 (da) 2013-08-26
EP2322752A4 (de) 2012-09-12

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