EP2770155A1 - Safe telescopic ladder capable of preventing hand from being pinched - Google Patents

Safe telescopic ladder capable of preventing hand from being pinched Download PDF

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Publication number
EP2770155A1
EP2770155A1 EP13810359.3A EP13810359A EP2770155A1 EP 2770155 A1 EP2770155 A1 EP 2770155A1 EP 13810359 A EP13810359 A EP 13810359A EP 2770155 A1 EP2770155 A1 EP 2770155A1
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EP
European Patent Office
Prior art keywords
column
annular groove
cylindrical portion
cover
wall
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
EP13810359.3A
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German (de)
French (fr)
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EP2770155B1 (en
EP2770155A4 (en
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
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Ningbo Xingfu Tools Co Ltd
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Publication of EP2770155A1 publication Critical patent/EP2770155A1/en
Publication of EP2770155A4 publication Critical patent/EP2770155A4/en
Application granted granted Critical
Publication of EP2770155B1 publication Critical patent/EP2770155B1/en
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    • 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
    • E06C7/087—Connections between rungs or treads and longitudinal members with a connecting piece installed around the rung

Definitions

  • the invention relates to an extendable ladder including a plurality of stiles formed by a plurality of telescopically collapsible columns and capable of sliding up and down, in particular to extendable ladder with a safety feature for preventing finger injury.
  • Extendable ladders are ladders, applied to aerial work, which may be extended for use and folded for storage when not used.
  • US Patent No. US7048094 and Chinese Utility Model No. ZL200620141000.4 Publication No.: CN200985735Y ), titled Extendable Ladder, disclosed such an extendable ladder, comprising: a first stile, a second stile and a plurality of rungs disposed between the first stile and the second stile, the first stile being composed of a first column and a second column, the first column having an internal surface, and the second column being connected with the first column in a nested arrangement to form a telescopic mechanism capable of movement lengthwise; a locking mechanism for selectively locking the second column with respect to the first column; a button operably connected to the locking mechanism for controlling the locking mechanism; characterized in that the button is disposed approaching to the first column and has a concave portion matched up with the size of the thumb tip, the thumb tip is put inside the concave portion to
  • the collapsing of the extendable ladder may be slowed down, the possibility of suffering an injury of clamping or crushing the fingers of the user by the rungs may be reduced. Therefore, the structure of the existing extendable ladders may be further improved.
  • the extendable ladder with a safety feature for preventing finger injury comprises: two vertical stiles with a plurality of rungs disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns, each column provided with a bottom opening and an inner wall, characterized in that each column receives a cover at the bottom opening to cover the bottom opening, the cover has a small cylindrical portion and a large cylindrical portion with a peripheral surface located under the small cylindrical portion, the small cylindrical portion inserts into the bottom opening of a column and is positioned inside the column, while the large cylindrical portion is exposed outside of the column and inserted inside of a next lower column, an annular groove is formed on the peripheral surface of the large cylindrical portion, the annular groove has a bottom inner wall, a plurality of through holes are vertically provided on the bottom inner wall of the annular groove for enabling air to exit from the annular groove, a sealing ring is disposed inside the annular groove and capable of sliding up and down in the annul
  • the bottom of the small cylindrical portion of the cover is in truncated cone-shape.
  • An auxiliary sealing ring is disposed between the bottom of the small cylindrical portion of the cover and the inner wall of the column, to form a better gas seal between the cover and the inner wall of the column, in order to ensure the collapsing of the next upper column slower.
  • a bulge is protruding upward from the top of the small cylindrical portion of the cover and disposed along the diameter line of the small cylindrical portion, and a positioning hole is respectively formed on two sides of the bulge, a positioning pin respectively passes through the wall of the column and inserts into the positioning hole so as to position the cover at the bottom opening of the column.
  • the inner side surface of the annular groove is in arc shape.
  • the structure of the arc groove provides an appropriate motion space for the sealing ring. As the bottom is not in planar contact with the sealing ring, there is always a gap between the sealing ring and the annular groove. During the lifting of the columns, a small amount of air can passes through the through hole, so that the lifting of the columns becomes relatively easy.
  • the inner side surface of the annular groove may be in truncated cone-shape.
  • the inner side surface of the annular groove is in truncated cone-shape, during the collapsing of the next upper column, the airtightness between the sealing ring and the inner wall of the next lower column is appropriate, that is, it is ensured not only that there is no much air pass through a gap between the sealing ring and the inner wall of the next lower column, but also that there is a proper amount of air passing through the gap between the sealing ring and the inner wall of the next lower column, so that the collapsing of the columns is moderate, i.e., not too slow or too fast.
  • each column is provided with a cover at the bottom opening thereof, a movable frictional seal is formed between the periphery surface of the large cylindrical portion of each cover and the inner wall of the next lower column through the sealing ring, and the space between two covers of two adjacent columns is a relatively closed space, therefore, when the next upper column is collapsing, the cover of the next upper column will be affected by the resistance of the air inside the closed space, the air can be only exited from gaps between the components of the extendable ladder, the speed of collapsing will be slowed down. Due to the slowed collapsing, a person may have enough reaction time to withdraw his/her fingers in time even through the fingers are just in an inappropriate position.
  • a preferred embodiment of the present invention is shown.
  • the extendable ladder with a safety feature for preventing finger injury comprises two vertical stiles with a plurality of rungs 6 disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns 1, each column 1 being connected to the corresponding rung 5 via a connecting sleeve 7; a plug pin disposed inside the connecting sleeve 7, which can move horizontally and transversely with respect to the connection sleeve 7 and be exposed outside to lock the column 1 with the next lower column together; a spring disposed inside the connection sleeve 7, which can keep the plug pin in the trend of being exposed outside; and a push button 8 which can drive the plug pin to move transversely.
  • the foregoing shows the conventional structure of an extendable ladder.
  • each column 1 receives a cover 2 at the bottom opening to cover the bottom opening, the cover 2 has a small cylindrical portion 21 and a large cylindrical portion 22 with a peripheral surface located under the small cylindrical portion 21, so that the cover 2 is in shape of a cylindrical step having a small top and a large bottom, the small cylindrical portion 21 inserts into the bottom opening of a column and is positioned inside the column 1.
  • the bottom 25 of the small cylindrical portion 21 of the cover 2 is in truncated cone-shape. In this way, the cover 2 can be inserted into the column 1 in the way of cone penetration, so that the cover 2 is tightly positioned with the inner wall of the column 1.
  • An auxiliary sealing ring 4 can be disposed between the bottom of the small cylindrical portion 21 of the cover 2 and the inner wall of the column 1.
  • a bulge 26 is protruding upward from the top of the small cylindrical portion 21 of the cover 2 and disposed along the diameter line of the small cylindrical portion 21, and a positioning hole 27 is respectively formed on two sides of the bulge 26, a positioning pin 5 respectively passes through the wall of the column 1 and inserts into the positioning hole 27 so as to position the cover 2 at the bottom opening of the column 1.
  • the large cylindrical portion 22 is exposed outside of the column 1 and inserted inside of a next lower column 1, an annular groove 23 is formed on the peripheral surface of the large cylindrical portion 22, the annular groove has a bottom inner wall, a plurality of through holes 24 are vertically provided on the bottom inner wall of the annular groove 23 for enabling air to exit from the annular groove, a sealing ring 3 is disposed inside the annular groove 23 and capable of sliding up and down in the annular groove 23, and the sealing ring 3 touches the inner wall of the next lower column 1 when the stile is extending or collapsing and forms a movable frictional seal for the next lower column 1. It is not required to form close airtight between the sealing ring 3 and the inner wall of the next column 1 when the stile is extending or collapsing, instead, appropriate ventilation is required therebetween.
  • the inner side surface 231 of the annular groove 23 is in arc shape.
  • the inner side surface 232 of the annular groove 23 is in truncated cone-shape.
  • Each column 1 receives a cover 2 at the bottom opening.
  • a relatively closed space is formed by inner walls of the columns 1 between the covers of two adjacent columns 1, a movable frictional seal is formed between the periphery surface of the large cylindrical portion 22 of each cover 2 and the inner wall of the next lower column 1 through the sealing ring 3.
  • the requirement on the sealing precision between the sealing ring 3 and the next lower column 1 is low, and appropriate air leakage may be allowed between the sealing ring 3 and the inner wall of the next lower column 1.
  • there is always a certain gap at each junction of all components of the extendable ladder for example, the gap between the positioning pin 5 and the positioning hole 27, so that air may flow out from the gaps between the other components of the extendable ladder.
  • the sealing ring 3 slides upward relatively to the annular groove 23, and the through holes 24 do not work at this time.
  • the cover 2 of the next upper column will be affected by the resistance of air inside the closed space, and the air inside the closed space may be exited slowly from the gaps at the junctions of components of the extendable ladder, so the collapsing of the column 1 may be slowed down. Due to the slowed collapsing, a person may have enough reaction time to withdraw his/her fingers in time even through the fingers are just in an inappropriate position. In addition, since the speed of the collapsing of the ladder is slowed down, the force applied to the fingers is quite small even if the fingers are crushed.
  • the purposes of preventing finger injury and eliminating potential safety hazards are achieved.
  • the through holes are provided on the inner wall of the annular groove, when the columns move upward while the extendable ladder is extending for use, the air between two covers of two adjacent columns can exit passing through the annular groove and the through holes, the through holes act as a accessorial passage for air, it will make the extending operation much easy and save the labor of the user, as shown in Figs. 1 , 2 and 3 .

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

Abstract

The invention relates to an extendable ladder with a safety feature for preventing finger injury, which comprises: two vertical stiles with a plurality of rungs disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns (1), characterized in that each column (1) receives a cover (2) at the bottom opening to cover the bottom opening, the cover (2) has a small cylindrical portion (21) and a large cylindrical portion (22), an annular groove (23) is formed on the peripheral surface of the large cylindrical portion (22), a plurality of through holes (24) are vertically provided on the bottom inner wall of the annular groove (23) for enabling air to exit from the annular groove, a sealing ring (3) is disposed inside the annular groove (23) and capable of sliding up and down in the annular groove (23), and the sealing ring (3) touches the inner wall of the next lower column (1) when the stile is extending or collapsing and forms a movable frictional seal for the next lower column (1). During the collapsing of the next upper column (1), the cover (2) of the next upper column (1) will be affected by the resistance of gas inside the closed space, and the gas inside the closed space may be exited slowly from the gaps at the junctions of components of the extendable ladder, therefore the purposes of preventing finger injury and eliminating potential safety hazards are achieved; since through holes (24) are provided inside the annular groove (23), when the columns (1) move upward while the extendable ladder is extending for use, air in the columns (1) may be in circulation by the through holes (24), which saves labor to extend the extendable ladder.

Description

    Field of the Invention
  • The invention relates to an extendable ladder including a plurality of stiles formed by a plurality of telescopically collapsible columns and capable of sliding up and down, in particular to extendable ladder with a safety feature for preventing finger injury.
    • Description of the Prior Art
  • Extendable ladders are ladders, applied to aerial work, which may be extended for use and folded for storage when not used. US Patent No. US7048094 and Chinese Utility Model No. ZL200620141000.4 (Publication No.: CN200985735Y ), titled Extendable Ladder, disclosed such an extendable ladder, comprising: a first stile, a second stile and a plurality of rungs disposed between the first stile and the second stile, the first stile being composed of a first column and a second column, the first column having an internal surface, and the second column being connected with the first column in a nested arrangement to form a telescopic mechanism capable of movement lengthwise; a locking mechanism for selectively locking the second column with respect to the first column; a button operably connected to the locking mechanism for controlling the locking mechanism; characterized in that the button is disposed approaching to the first column and has a concave portion matched up with the size of the thumb tip, the thumb tip is put inside the concave portion to push the button in a direction from the first column to the second column to unlocking the locking mechanism from the second column; a sleeve sleeved on an external surface of the second column and having an external guiding surface that touches an internal surface of the first column. The extendable ladder may be extended for use and folded for storage.
  • For an extendable ladder in the prior art, after the button is pushed for unlocking, the ladder descends and folds due to its weight. Because of low resistance during the collapsing of the ladder, all columns will descend and fold rapidly. If a user holds at an inappropriate position by two hands, with fingers just between two rungs, it is likely to cause an injury of clamping or crushing the fingers of the user by the rungs of the extendable ladder. The degree of clamping will become much more serious with the rapid collapsing of the ladder.
  • If the collapsing of the extendable ladder may be slowed down, the possibility of suffering an injury of clamping or crushing the fingers of the user by the rungs may be reduced. Therefore, the structure of the existing extendable ladders may be further improved.
    • Summary of the Invention
  • It is an object of the present invention to provide a extendable ladder with a safety feature for preventing finger injury, which can slow down the folding of the ladder, so that the purposes of avoiding clamping the fingers of a user and eliminating potential safety hazards are achieved by slowing down the collapsing of the ladder.
  • For achieving this object, the extendable ladder with a safety feature for preventing finger injury, comprises: two vertical stiles with a plurality of rungs disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns, each column provided with a bottom opening and an inner wall, characterized in that each column receives a cover at the bottom opening to cover the bottom opening, the cover has a small cylindrical portion and a large cylindrical portion with a peripheral surface located under the small cylindrical portion, the small cylindrical portion inserts into the bottom opening of a column and is positioned inside the column, while the large cylindrical portion is exposed outside of the column and inserted inside of a next lower column, an annular groove is formed on the peripheral surface of the large cylindrical portion, the annular groove has a bottom inner wall, a plurality of through holes are vertically provided on the bottom inner wall of the annular groove for enabling air to exit from the annular groove, a sealing ring is disposed inside the annular groove and capable of sliding up and down in the annular groove, and the sealing ring touches the inner wall of the next lower column when the stile is extending or collapsing and forms a movable frictional seal for the next lower column.
  • The bottom of the small cylindrical portion of the cover is in truncated cone-shape. In this way, when the small cylindrical portion is gradually inserted into a column, under the extrusion between the conical surface and the inner wall of the column, the cover is ensured to firm positioned with the structure; additionally, the conical surface also plays a role of guiding, which is convenient for the assembly of the cover.
  • An auxiliary sealing ring is disposed between the bottom of the small cylindrical portion of the cover and the inner wall of the column, to form a better gas seal between the cover and the inner wall of the column, in order to ensure the collapsing of the next upper column slower.
  • A bulge is protruding upward from the top of the small cylindrical portion of the cover and disposed along the diameter line of the small cylindrical portion, and a positioning hole is respectively formed on two sides of the bulge, a positioning pin respectively passes through the wall of the column and inserts into the positioning hole so as to position the cover at the bottom opening of the column. By this structure, the cover can be positioned with the column conveniently.
  • The inner side surface of the annular groove is in arc shape. The structure of the arc groove provides an appropriate motion space for the sealing ring. As the bottom is not in planar contact with the sealing ring, there is always a gap between the sealing ring and the annular groove. During the lifting of the columns, a small amount of air can passes through the through hole, so that the lifting of the columns becomes relatively easy.
  • Similarly, the inner side surface of the annular groove may be in truncated cone-shape. The inner side surface of the annular groove is in truncated cone-shape, during the collapsing of the next upper column, the airtightness between the sealing ring and the inner wall of the next lower column is appropriate, that is, it is ensured not only that there is no much air pass through a gap between the sealing ring and the inner wall of the next lower column, but also that there is a proper amount of air passing through the gap between the sealing ring and the inner wall of the next lower column, so that the collapsing of the columns is moderate, i.e., not too slow or too fast.
  • Compared with the prior art, in the present invention, each column is provided with a cover at the bottom opening thereof, a movable frictional seal is formed between the periphery surface of the large cylindrical portion of each cover and the inner wall of the next lower column through the sealing ring, and the space between two covers of two adjacent columns is a relatively closed space, therefore, when the next upper column is collapsing, the cover of the next upper column will be affected by the resistance of the air inside the closed space, the air can be only exited from gaps between the components of the extendable ladder, the speed of collapsing will be slowed down. Due to the slowed collapsing, a person may have enough reaction time to withdraw his/her fingers in time even through the fingers are just in an inappropriate position. Furthermore, since the speed of collapsing of the ladder is slowed down, the force applied to the fingers is quite small even if the fingers are crushed. Therefore, the purposes of preventing finger injury and eliminating potential safety hazards are achieved. In addition, since a plurality of through holes are vertically provided on the inner wall of the annular groove, when the columns move upward while the extendable ladder is extending for use, the air between two covers of two adjacent columns can exit passing through the annular groove and the through holes, the through holes act as a accessorial passage for air, it will make the extending operation much easy and save the labor of the user.
    • Brief Description of the Drawings
    • Fig. 1 is a perspective view of an extendable ladder in accordance with an embodiment of the present invention(when the columns are extending).
    • Fig. 2 is a sectional perspective view of the extendable ladder in accordance with the embodiment of the present invention when the columns are extending.
    • Fig. 3 is an enlarged view of region-A in Fig. 2.
    • Fig. 4 is a perspective view of an extendable ladder in accordance with the embodiment of the present invention (when the columns are collapsing).
    • Fig. 5 is a sectional perspective view in accordance with the embodiment of the present invention when the columns are collapsing.
    • Fig. 6 is a sectional view of line B-B of Fig. 5.
    • Fig. 7 is a front view of a first cover in accordance with the embodiment of the present invention.
    • Fig. 8 is a perspective view of the first cover in accordance with the embodiment of the present invention.
    • Fig. 9 is a front view of a second cover in accordance with the embodiment of the present invention.
    • Fig. 10 is a perspective view of the second cover in accordance with the embodiment of the present invention.
    Detailed description of the preferred embodiment
  • To enable a further understanding of the innovative and technological content of the invention herein, refer to the detailed description of the invention and the accompanying drawings below:
  • As shown in Fig. 1 to Fig. 10, a preferred embodiment of the present invention is shown.
  • The extendable ladder with a safety feature for preventing finger injury, comprises two vertical stiles with a plurality of rungs 6 disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns 1, each column 1 being connected to the corresponding rung 5 via a connecting sleeve 7; a plug pin disposed inside the connecting sleeve 7, which can move horizontally and transversely with respect to the connection sleeve 7 and be exposed outside to lock the column 1 with the next lower column together; a spring disposed inside the connection sleeve 7, which can keep the plug pin in the trend of being exposed outside; and a push button 8 which can drive the plug pin to move transversely.
  • The foregoing shows the conventional structure of an extendable ladder.
  • The extendable ladder has the following major improvements: each column 1 receives a cover 2 at the bottom opening to cover the bottom opening, the cover 2 has a small cylindrical portion 21 and a large cylindrical portion 22 with a peripheral surface located under the small cylindrical portion 21, so that the cover 2 is in shape of a cylindrical step having a small top and a large bottom, the small cylindrical portion 21 inserts into the bottom opening of a column and is positioned inside the column 1.
  • The bottom 25 of the small cylindrical portion 21 of the cover 2 is in truncated cone-shape. In this way, the cover 2 can be inserted into the column 1 in the way of cone penetration, so that the cover 2 is tightly positioned with the inner wall of the column 1. An auxiliary sealing ring 4 can be disposed between the bottom of the small cylindrical portion 21 of the cover 2 and the inner wall of the column 1.
  • A bulge 26 is protruding upward from the top of the small cylindrical portion 21 of the cover 2 and disposed along the diameter line of the small cylindrical portion 21, and a positioning hole 27 is respectively formed on two sides of the bulge 26, a positioning pin 5 respectively passes through the wall of the column 1 and inserts into the positioning hole 27 so as to position the cover 2 at the bottom opening of the column 1.
  • The large cylindrical portion 22 is exposed outside of the column 1 and inserted inside of a next lower column 1, an annular groove 23 is formed on the peripheral surface of the large cylindrical portion 22, the annular groove has a bottom inner wall, a plurality of through holes 24 are vertically provided on the bottom inner wall of the annular groove 23 for enabling air to exit from the annular groove, a sealing ring 3 is disposed inside the annular groove 23 and capable of sliding up and down in the annular groove 23, and the sealing ring 3 touches the inner wall of the next lower column 1 when the stile is extending or collapsing and forms a movable frictional seal for the next lower column 1. It is not required to form close airtight between the sealing ring 3 and the inner wall of the next column 1 when the stile is extending or collapsing, instead, appropriate ventilation is required therebetween.
  • As shown in Fig. 7 and Fig. 8, the inner side surface 231 of the annular groove 23 is in arc shape.
  • As shown in Fig. 9 and Fig. 10, the inner side surface 232 of the annular groove 23 is in truncated cone-shape.
  • Each column 1 receives a cover 2 at the bottom opening. A relatively closed space is formed by inner walls of the columns 1 between the covers of two adjacent columns 1, a movable frictional seal is formed between the periphery surface of the large cylindrical portion 22 of each cover 2 and the inner wall of the next lower column 1 through the sealing ring 3. The requirement on the sealing precision between the sealing ring 3 and the next lower column 1 is low, and appropriate air leakage may be allowed between the sealing ring 3 and the inner wall of the next lower column 1. In addition, there is always a certain gap at each junction of all components of the extendable ladder, for example, the gap between the positioning pin 5 and the positioning hole 27, so that air may flow out from the gaps between the other components of the extendable ladder. During the collapsing of the next upper column 1, the sealing ring 3 slides upward relatively to the annular groove 23, and the through holes 24 do not work at this time. The cover 2 of the next upper column will be affected by the resistance of air inside the closed space, and the air inside the closed space may be exited slowly from the gaps at the junctions of components of the extendable ladder, so the collapsing of the column 1 may be slowed down. Due to the slowed collapsing, a person may have enough reaction time to withdraw his/her fingers in time even through the fingers are just in an inappropriate position. In addition, since the speed of the collapsing of the ladder is slowed down, the force applied to the fingers is quite small even if the fingers are crushed. Therefore, the purposes of preventing finger injury and eliminating potential safety hazards are achieved. In addition, since the through holes are provided on the inner wall of the annular groove, when the columns move upward while the extendable ladder is extending for use, the air between two covers of two adjacent columns can exit passing through the annular groove and the through holes, the through holes act as a accessorial passage for air, it will make the extending operation much easy and save the labor of the user, as shown in Figs. 1,2 and 3.

Claims (6)

  1. An extendable ladder with a safety feature for preventing finger injury, comprising:
    two vertical stiles with a plurality of rungs disposed between two stiles, each stile being formed by a plurality of telescopically collapsible columns (1), each column provided with a bottom opening and an inner wall,
    characterized in that each column (1) receives a cover (2) at the bottom opening to cover the bottom opening,
    the cover (2) has a small cylindrical portion (21) and a large cylindrical portion (22) with a peripheral surface located under the small cylindrical portion (21),
    the small cylindrical portion (21) inserts into the bottom opening of a column (1) and is positioned inside the column (1), while the large cylindrical portion (22) is exposed outside of the column (1) and inserted inside of a next lower column (1),
    an annular groove (23) is formed on the peripheral surface of the large cylindrical portion (22), the annular groove has a bottom inner wall,
    a plurality of through holes (24) are vertically provided on the bottom inner wall of the annular groove (23) for enabling air to exit from the annular groove,
    a sealing ring (3) is disposed inside the annular groove (23) and capable of sliding up and down in the annular groove (23), and the sealing ring (3) touches the inner wall of the next lower column (1) when the stile is extending or collapsing and forms a movable frictional seal for the next lower column (1).
  2. The extendable ladder according to claim 1, characterized in that the bottom (25) of the small cylindrical portion (21) of the cover (2) is in truncated cone-shape.
  3. The extendable ladder according to claim 1, characterized in that an auxiliary sealing ring (4) is disposed between the bottom of the small cylindrical portion (21) of the cover (2) and the inner wall of the column (1).
  4. The extendable ladder according to claim 1, characterized in that a bulge (26) is protruding upward from the top of the small cylindrical portion (21) of the cover (2) and disposed along the diameter line of the small cylindrical portion (21), and a positioning hole (27) is respectively formed on two sides of the bulge (26), a positioning pin (5) respectively passes through the wall of the column (1) and inserts into the positioning hole (27) so as to position the cover (2) at the bottom opening of the column (1).
  5. The extendable ladder according to claim 1, characterized in that the inner side surface (231) of the annular groove (23) is in arc shape.
  6. The extendable ladder according to claim 1, characterized in that the inner side surface (232) of the annular groove (23) is in truncated cone-shape.
EP13810359.3A 2012-06-26 2013-04-22 Safe telescopic ladder capable of preventing hand from being pinched Active EP2770155B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210217317.1A CN102733751B (en) 2012-06-26 2012-06-26 Anti-hand-pinching safe telescopic ladder
PCT/CN2013/000455 WO2014000407A1 (en) 2012-06-26 2013-04-22 Safe telescopic ladder capable of preventing hand from being pinched

Publications (3)

Publication Number Publication Date
EP2770155A1 true EP2770155A1 (en) 2014-08-27
EP2770155A4 EP2770155A4 (en) 2015-04-22
EP2770155B1 EP2770155B1 (en) 2016-06-29

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EP13810359.3A Active EP2770155B1 (en) 2012-06-26 2013-04-22 Safe telescopic ladder capable of preventing hand from being pinched

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EP (1) EP2770155B1 (en)
CN (1) CN102733751B (en)
DE (1) DE202013011753U1 (en)
DK (1) DK2770155T3 (en)
WO (1) WO2014000407A1 (en)

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GB2536347A (en) * 2015-03-13 2016-09-14 Teletower Com Ltd Pneumatic damper
WO2017034399A1 (en) 2015-08-24 2017-03-02 Lampe Holding B.V. Telescopic ladder assembly
WO2017088891A1 (en) * 2015-11-28 2017-06-01 Otto Martinus Nielsen Collapsible ladder
FR3057600A1 (en) * 2016-10-19 2018-04-20 Zhuhai Quan Da Industry & Commerce Co., Ltd TELESCOPIC LADDER
WO2018088906A1 (en) 2016-11-14 2018-05-17 Lampe Holding B.V. Telescopic ladder assembly
WO2018160064A1 (en) 2017-02-28 2018-09-07 Lampe Holding B.V. Telescopically extendable and collapsible ladder with air dampers
WO2019011082A1 (en) 2017-07-10 2019-01-17 东莞威信运动用品有限公司 Telescopic pipe buffer structure
USD959024S1 (en) 2020-12-04 2022-07-26 Dorel Home Furnishings, Inc. Tray for telescoping ladder

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Publication number Priority date Publication date Assignee Title
CN102733751B (en) * 2012-06-26 2015-02-25 宁波兴富工具有限公司 Anti-hand-pinching safe telescopic ladder
CN105781406B (en) * 2015-12-24 2018-07-06 东莞威信运动用品有限公司 A kind of telescoping tube guide sleeve and a kind of telescoping tube staircase
CN105443025B (en) * 2016-01-08 2017-04-12 浙江大学 Extension ladder with functions of automatic locking and unlocking
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DK2770155T3 (en) 2016-10-03
CN102733751B (en) 2015-02-25
CN102733751A (en) 2012-10-17
DE202013011753U1 (en) 2014-07-04
EP2770155B1 (en) 2016-06-29
WO2014000407A1 (en) 2014-01-03
EP2770155A4 (en) 2015-04-22

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