GB2417280A - Adjustable ladder apparatus - Google Patents

Adjustable ladder apparatus Download PDF

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Publication number
GB2417280A
GB2417280A GB0417416A GB0417416A GB2417280A GB 2417280 A GB2417280 A GB 2417280A GB 0417416 A GB0417416 A GB 0417416A GB 0417416 A GB0417416 A GB 0417416A GB 2417280 A GB2417280 A GB 2417280A
Authority
GB
United Kingdom
Prior art keywords
ladder apparatus
angle
lateral support
level
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.)
Withdrawn
Application number
GB0417416A
Other versions
GB0417416D0 (en
Inventor
Neil Ernest Allen
Ernest William Allen
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.)
NEALLEN Ltd
Original Assignee
NEALLEN 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 NEALLEN Ltd filed Critical NEALLEN Ltd
Priority to GB0417416A priority Critical patent/GB2417280A/en
Publication of GB0417416D0 publication Critical patent/GB0417416D0/en
Publication of GB2417280A publication Critical patent/GB2417280A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
    • 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
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • 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
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
    • 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
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/387—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders having tip-up steps
    • 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
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms
    • E06C1/393—Ladders having platforms foldable with the ladder

Landscapes

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

Abstract

The ladder apparatus 10 comprises a plurality of steps 12, 14 in order to enable a user to climb from a first level to a second level in a scaffolding structure. The ladder apparatus provides a staircase rather than a conventional ladder having narrow rungs. The ladder apparatus 10 is adjustable and can be moved to extend at different angles and the steps are arranged to automatically remain in a parallel and horizontal plane.

Description

241 7280
LADDER APPARATUS
Field of the Invention
The present invention relates to ladder apparatus, an assembly including ladder apparatus and a method of providing ladder apparatus.
Background to the Invention
Construction sites generally use platforms constructed from scaffolding poles, boards and planks in order to enable builders and workers to work on the constructions.
Accordingly, apparatus is generally provided for workers to move from a platform at one level to a platform at a different level. Generally, standard temporary or semi- temporary ladders are used to enable builders to climb up or down to different levels. However, these ladders are generally placed at a relatively large vertical angle which results in the ladders being unsafe. In addition, ladders require the user to hold on to the ladder with their hands which means that the user cannot easily carry equipment up or down the ladders.
Furthermore, the ladders are only placed against the scaffolding and may easily fall away or inadvertently move away from the scaffolding.
Prior art staircases having steps may be provided to enable users to move from one level to another rather than a ladder having rungs. However, such prior art staircases are provided with a set height to be used at a set angle between levels of a set distance. Accordingly, such prior art staircases may only be used in particular situations where the levels are spaced by predetermined amounts. It may be possible to use a staircase when the levels are not accurately spaced but this distance must be compensated for by providing a base to raise the staircase upwards which may be unstable. Alternatively users may have to either have a large step at the top or bottom which may be dangerous. The staircase may be arranged to project above the upper level but this will then require a user to step over the top of the staircase which is hazardous.
It is an aim of the present invention to overcome at least one problem associated with the prior art whether referred to herein or otherwise.
Summary of the Invention
According to a first aspect of the present invention there is provided ladder apparatus comprising at least a first step and a second step wherein the first step comprises an upper support surface and the second step comprises an upper support surface, in which the ladder apparatus is movable from a first angle to a second angle in which the ladder apparatus provides parallel steps at both the first angle and the second angle.
Preferably movement of the ladder apparatus from the first angle to the second angle automatically causes the steps to be maintained horizontal and/or parallel.
Preferably the planes of the upper surface of the first step and the second step are parallel.
Preferably the planes of the upper surfaces of the first step and the second step at the first angle are parallel to the planes of the upper surfaces of the first step and the second step at the second angle. Preferably, the plane of the upper surfaces of the first step and the second step are substantially horizontal at the first angle and at the second angle.
Preferably the upper surface of the or each step are substantially planar.
Preferably the ladder apparatus is movable between a plurality of positions or angles in which the ladder apparatus provides at least a first step and a second step in each position or angle and in which each step may be substantially parallel in each position or angle and preferably are horizontal in each position or angle.
Preferably the angle of the first step and the second step adjust automatically with the angle of the ladder apparatus.
The ladder apparatus may be movable between an angle of O degrees and 90 degrees in which the ladder apparatus provides a first step and a second step in each position.
Preferably the ladder apparatus is movable between an angle of 30 degrees and 85 degrees in which the ladder apparatus provides a first step and a second step in each position.
More preferably the ladder apparatus is movable between an angle of 45 degrees and 80 degrees in which the ladder apparatus provides a first step and a second step in each position.
Preferably the first step and the second step are substantially horizontal in each position or at each angle of the ladder apparatus.
Preferably the ladder apparatus comprises a first lateral support means and second lateral support means. The first lateral support means may comprise a lateral support leg.
The first lateral support means may comprise a first (front) lateral support leg and a second (rear) lateral support leg. The second lateral support means may comprise a lateral support leg. The second lateral support means may comprise a first (front) lateral support leg and a second (rear) lateral support leg.
The or each first (front) lateral support leg may be coupled to a respective second (rear) lateral support leg by coupling means. The coupling means may comprise the or each step.
Preferably the or each step extends between the first lateral support means and the second lateral support means.
Preferably the first lateral support means is arranged, in use, to be parallel to the second lateral support means.
Preferably the or each first (front) lateral support leg is arranged, in use, to be parallel to a respective second lateral support leg.
Preferably each step comprises a first support member and a second support member. Preferably each support member extends between the first lateral support means and the second lateral support means. Preferably each step comprises a support surface. Preferably the support surface provides an upper support surface to enable a user to step thereon.
The support surface may be continual.
The support surface may have apertures provided therein.
The support surface may comprise a non-slip surface.
The support surface may have a raised patterned or profiled surface.
The support surface may comprise metal and preferably comprises aluminium.
The ladder apparatus may comprise upper securement means to secure the ladder apparatus to a structure and preferably to a scaffolding structure. Preferably the upper securement means comprises engagement means in order for the ladder apparatus to engage a part of a structure and preferably a part of a scaffolding structure.
According to a second aspect of the present invention there is provided an assembly comprising a scaffolding structure and ladder apparatus wherein the ladder apparatus is in accordance with the first aspect of the present invention.
Preferably the scaffolding structure provides a first level and a second level. Preferably, the ladder apparatus provides access between the first level and the second level.
According to a third aspect of the present invention there is provided a method of providing access between a first level and a second level comprising securing ladder apparatus between the first level and a second wherein the ladder apparatus is in accordance with the first aspect of the present invention.
Preferably the method comprises moving the ladder apparatus between a first angle and a second angle.
Preferably movement of the ladder apparatus causes relative movement of the planes of the steps.
Preferably the method comprises maintaining each step of the ladder apparatus in a horizontal plane.
The method may comprise pivoting each step relative to lateral support means whilst moving the ladder apparatus between a first angle and a second angle.
The method may comprise providing a temporary staircase between the first level and the second level.
The method may comprise collapsing the ladder apparatus into a storage configuration.
Brief Description of the Drawings
The present invention will now be described by way of example only, with reference to the drawings that follow, in which: Figure 1 is a perspective view of part of a preferred embodiment of ladder apparatus.
Figure 2 is a side view of a preferred embodiment of ladder apparatus providing access between a first level and a second level of a scaffolding structure.
Figure 3 is a side view of a preferred embodiment of ladder apparatus providing access between a first level and a second level of a scaffolding structure.
Figure 4 is a side view of a preferred embodiment of ladder apparatus providing access between a first level and a second level at a scaffolding structure.
Figure 5 is a cross-section of a step of a preferred embodiment of ladder apparatus.
Figure 6 is a side schematic view of a first step and a second step and lateral support means of a preferred embodiment of ladder apparatus.
Figure 7 is a side schematic view of a first step and a second step and lateral support means of a preferred embodiment of ladder apparatus.
Figure 8 is a side schematic view of a first step and a second step and lateral support means of a preferred embodiment of ladder apparatus.
Description of the preferred embodiments
As shown in Figure 1, the ladder apparatus 10 comprises a plurality of steps 12, 14 in order to enable a user to climb up the ladder apparatus 10 from a first location or level to a second location or level. In particular, the ladder 10 apparatus enables a user to move or climb from a first level 16 or platform of a scaffolding structure to a second higher level 18 or platform of a scaffolding structure. Previously, conventional temporary ladders have been used to enable users to move between levels.
However, the present invention provides a staircase, comprising a number of steps 12, 14 having support surfaces rather than a conventional ladder providing relatively narrow rungs.
The ladder apparatus 10 provides a number of steps 12, 14 each of which provide a level upper surface 30 similar to that of a conventional staircase. Each step 12, 14 provides a relatively large upper surface especially when compared to rungs of conventional ladders. The upper surface 30 of each step 12, 14 is planar and may have a raised tread provided thereon or other slip resistant surface or covering.
The ladder apparatus 10 comprises lateral support means 20, 22, 24, 26 on each lateral side in order for the steps to be supported therebetween. In particular, the left lateral support means comprises a front lateral support member 20 and a rear lateral support member 24.
Similarly, the right lateral support means comprises a front lateral support member 22 and a rear lateral support member 26. The two front lateral support members 20, 22 are parallel and are arranged to support the front of the steps 12, 14 therebetween. Similarly, the two rear lateral support members are parallel and are arranged to support the rear of the steps 12, 14 therebetween.
The ladder apparatus 10 provides support means to support the front of each step 12, 14 and rear support means to support the rear of each step 12, 14. The front support means extends between the two front lateral support members 20, 22 whereas the rear support means extends between the two rear lateral support members 24, 26.
As shown in Figure 5, each step 12, 14 comprises a plate 28 which provides the upper support surface 30. The plate 28 is supported between the front support means and the rear support means. In particular, the plate 28 comprises a sleeve 32 or plurality of sleeves/collars 32 located towards the front edge of the underside of the plate 28 and the front support means or member comprises a rod 33 which is engaged through the sleeve 32 or sleeves/collars 32 such that the plate 28 is supported by the rod 33 but the sleeve 32 or sleeves/collars 32 can rotate about the rod. Similarly, the plate comprises a sleeve 34 or plurality of sleeves/ collars 34 located towards the rear edge of the underside of the plate 28 and the rear support means or member comprises a rod 35 which is engaged through the sleeve 34 or sleeves/collars 34 such that the plate 28 is supported by the rod 35 but the sleeve 35 or sleeves/collars 34 can rotate about the rod 35.
Accordingly, each plate 28 for each step 12, 14 is supported by a front rod 33 and a rear rod 35.
The or each front rod 33 is connected at either longitudinal end thereof to the front lateral support members 20, 22 of the ladder apparatus 10. Similarly, the or each rear rod 35 is connected at either longitudinal end thereof to the rear lateral support members 24, 26 of the ladder apparatus 10. The rods 33, 35 are fixedly connected to the lateral support members 20, 22, 24, 26, for example through a screw thread and nut, in order to prevent relative movement between the or each rod 33, 35 and the respective lateral support member 20, 22, 24, 26, for example to prevent rotation of the rod 33, 35 along the longitudinal axis thereof. However, in further embodiments, the rods 33, 35 may be pivotally connected to the lateral support members 20, 22, 24, 26 and the rods 33, 35 may be fixedly connected to the plate 28 of each step 12, 14. Accordingly, in each embodiment, the plate 28 and/or upper support surface 30 is movable and in particular pivotable between the lateral support members 20, 22, 24, 26. More specifically, when the ladder is secured between a first level 16 and a second level 18 the steps are automatically supported in a horizontal plane.
The front lateral support members 20, 22 are arranged to extend in a first plane and the rear lateral support members 24, 26 are arranged to extend in a second plane which is parallel to the first plane. The plate and/or upper support surface 30 of each step 12, 14 extends in a third plane which is at an angle relative to the first and second planes. In use, the angle of the ladder apparatus is adjustable but the first and second plane remain parallel whereas the angle between first and second plane the third plane increases or decreases relative to the first and second planes. Accordingly, the lateral support members 20, 22, 24, 26 can be positioned to extend between a first level 16 and a second level 18 in which the steps 12, 14 or at least the upper support surfaces 30 are always parallel and horizontal as shown in Figures 2 to 4.
The ladder apparatus 10 comprises upper securement means to secure an upper portion of the ladder apparatus 10 relative to a second level 18. Similarly the ladder apparatus 10 comprises lower securement means to secure a lower portion of the ladder apparatus 10 to a first level 16. The lower end of the ladder apparatus 10 may be arranged to simply be supported by a surface, for example on the ground or on a scaffolding platform. Since an upper surface is abutting the upper portion of the ladder apparatus the effect of gravity on the weight of the ladder apparatus 10 and a user supported thereon effectively ensures that the lower end of the ladder apparatus is securely supported on the lower support surface. In particular, if an upper part of the ladder is secured to an upper level, the lower part of the ladder is effectively secured to the structure.
As shown in Figure 6, Figure 7 and Figure 8, the steps 12, 14 and (left of right) lateral support members 20, 24 effectively form a parallelogram (or in one embodiment a rhombus). Accordingly, the ladder apparatus can be placed at selected angles (a) between substantially 0 degrees and degrees and the ladder apparatus will provide parallel level and horizontal steps 12, 14. Once the lateral support member are engaged with a scaffolding structure the horizontal planes of the steps 12, 14 are effectively secured in position and remain substantially in the horizontal plane. Movement of the lateral support means causes lateral support means can extend at any selected angle whilst the steps are automatically level, parallel and horizontal.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features
disclosed in this specification (including any
accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims (27)

  1. Claims 1. Ladder apparatus comprising at least a first step and a second
    step wherein the first step comprises an upper support surface and the second step comprises an upper support surface, in which the ladder apparatus is movable from a first angle to a second angle in which the ladder apparatus provides parallel steps at both the first angle and the second angle.
  2. 2. Ladder apparatus according to claim 1 in which movement of the ladder apparatus from the first angle to the second angle automatically causes the steps to be maintained horizontal and/or parallel.
  3. 3. Ladder apparatus according to claim 1 or claim 2 in which the planes of the upper surfaces of the first step and the second step at the first angle are parallel to the planes of the upper surfaces of the first step and the second step at the second angle.
  4. 4. Ladder apparatus according to any preceding claim in which the ladder apparatus is movable between a plurality of positions or angles in which the ladder apparatus provides at least a first step and a second step in each position or angle and in which each step is substantially parallel in each position or angle.
  5. 5. Ladder apparatus according to any preceding claim in which the ladder apparatus is movable between an angle of O degrees and 90 degrees in which the ladder apparatus provides a first step and a second step in each position.
    e e e e e e e e e e e e e e e e be. e e e e be e e e e e e e e e e e e e e eve e e e e
  6. 6. Ladder apparatus according to any preceding claim in which the ladder apparatus comprises a first lateral support means and second lateral support means.
  7. 7. Ladder apparatus according to claim 6 in which the first lateral support means comprises a first (front) lateral support leg and a second (rear) lateral support leg and the second lateral support means comprises a first (front) lateral support leg and a second (rear) lateral support leg.
  8. 8. Ladder apparatus according to claim 7 in which each first front lateral support leg is coupled to a respective rear lateral support leg by coupling means.
  9. 9. Ladder apparatus according to claim 8 in which the coupling means comprises the or each step.
  10. 10. Ladder apparatus according to any one of claims 7 to 9 in which the or each first (front) lateral support leg is arranged, in use, to be parallel to a respective second (rear) lateral support leg.
  11. 11. Ladder apparatus according to any preceding claim in which each step comprises a first support member and a second support member.
  12. 12. Ladder apparatus according to claim 11 in which each support member extends between first lateral support means and second lateral support means.
    e . . . r . -
  13. 13. Ladder apparatus according to any preceding claim in which the ladder apparatus comprises upper securement means to secure the ladder apparatus to a structure
  14. 14. Ladder apparatus according to claim 13 in which the upper securement means comprises engagement means in order for the ladder apparatus to engage a part of a scaffolding structure.
  15. 15. An assembly comprising a scaffolding structure and ladder apparatus wherein the ladder apparatus is in accordance with any one of claims 1 to 14.
  16. 16. An assembly according to claim 15 in which the scaffolding structure provides a first level and a second level.
  17. 17. An assembly according to claim 16 in which the ladder apparatus provides access between the first level and the second level.
  18. 18. A method of providing access between a first level and a second level comprising securing ladder apparatus between the first level and a second level wherein the ladder apparatus is in accordance with any one of claims 1 to 14.
  19. 19. A method according to claim 18 in which the method comprises moving the ladder apparatus between a first angle and a second angle.
    * .- . . . .
  20. 20. A method according to claim 19 in which movement of the ladder apparatus causes relative movement of the planes of the steps.
  21. 21. A method according to any one of claims 18 to 20 in which the method comprises maintaining each step of the ladder apparatus in a horizontal plane.
  22. 22. A method according to any one of claims 18 to 21 in which the method comprises pivoting each step relative to lateral support means whilst moving the ladder apparatus between a first angle and a second angle.
  23. 23. A method according to any one of claims 18 to 22 in IS which the method comprises providing a temporary staircase between the first level and the second level.
  24. 24. A method according to any one of claims 18 to 23 in which the method comprises collapsing the ladder apparatus into a storage configuration
  25. 25. Ladder apparatus substantially as herein described with reference to, and as shown in any of the accompanying drawings.
  26. 26. An assembly comprising a scaffolding structure and ladder apparatus substantially as herein described with reference to, and as shown in any of the accompanying drawings.
  27. 27. A method of providing access between a first level and a second level substantially as herein described with - * --e - . . * . . . reference to, and as shown in any of the accompanying drawings.
    . * . be- - * * . * . . .
GB0417416A 2004-08-05 2004-08-05 Adjustable ladder apparatus Withdrawn GB2417280A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0417416A GB2417280A (en) 2004-08-05 2004-08-05 Adjustable ladder apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0417416A GB2417280A (en) 2004-08-05 2004-08-05 Adjustable ladder apparatus

Publications (2)

Publication Number Publication Date
GB0417416D0 GB0417416D0 (en) 2004-09-08
GB2417280A true GB2417280A (en) 2006-02-22

Family

ID=32982547

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0417416A Withdrawn GB2417280A (en) 2004-08-05 2004-08-05 Adjustable ladder apparatus

Country Status (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2432623A (en) * 2005-06-27 2007-05-30 Acorn Corporate Services Ltd A scaffold stair unit which uses scaffolding tubes as stringers
NL2007133C2 (en) * 2011-07-18 2013-01-21 Gorter Group B V TRAP.
WO2020248871A1 (en) * 2019-06-12 2020-12-17 善缘有限公司 Foldable and angularly adjustable ladder
CN113107350A (en) * 2021-03-15 2021-07-13 中国煤炭科工集团太原研究院有限公司 Ladder climbing mechanism for anchor rod drill carriage
CN113581386A (en) * 2021-08-11 2021-11-02 上海外高桥造船有限公司 Special-shaped vertical ladder for inclined bottom channel of cargo hold of ultra-large liquefied gas carrier and ship

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713511A (en) * 1971-06-14 1973-01-30 L Hinkle Adjustable stair assembly
GB1536444A (en) * 1975-05-26 1978-12-20 Loix Gilbert Apparatus suitable for use as stairways stepladders and the like
DE8808580U1 (en) * 1988-07-05 1988-08-18 Losberger Gmbh & Co Kg, 7100 Heilbronn Height-adjustable staircase with railing
FR2635817A1 (en) * 1988-08-23 1990-03-02 David Robert Simple and portable ladder, step-ladder and accommodation ladder device with horizontal steps in all positions
US4959935A (en) * 1989-09-25 1990-10-02 Stob H Richard Adjustable stairway
JPH0468154A (en) * 1990-07-06 1992-03-03 Tategu Sogo Shosha Futaba:Kk Adjustable stairs
JPH11241584A (en) * 1998-02-24 1999-09-07 Nikko Co Ltd Stairway for temporary scaffold
GB2355735A (en) * 1999-10-04 2001-05-02 Kennedy Jack Metal Prod Adjustable stairway for use with an overcast in a mine
JP2002097800A (en) * 2001-08-22 2002-04-05 Nikko Co Ltd Continuous installation method of stairsway for temporary scaffold

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713511A (en) * 1971-06-14 1973-01-30 L Hinkle Adjustable stair assembly
GB1536444A (en) * 1975-05-26 1978-12-20 Loix Gilbert Apparatus suitable for use as stairways stepladders and the like
DE8808580U1 (en) * 1988-07-05 1988-08-18 Losberger Gmbh & Co Kg, 7100 Heilbronn Height-adjustable staircase with railing
FR2635817A1 (en) * 1988-08-23 1990-03-02 David Robert Simple and portable ladder, step-ladder and accommodation ladder device with horizontal steps in all positions
US4959935A (en) * 1989-09-25 1990-10-02 Stob H Richard Adjustable stairway
JPH0468154A (en) * 1990-07-06 1992-03-03 Tategu Sogo Shosha Futaba:Kk Adjustable stairs
JPH11241584A (en) * 1998-02-24 1999-09-07 Nikko Co Ltd Stairway for temporary scaffold
GB2355735A (en) * 1999-10-04 2001-05-02 Kennedy Jack Metal Prod Adjustable stairway for use with an overcast in a mine
JP2002097800A (en) * 2001-08-22 2002-04-05 Nikko Co Ltd Continuous installation method of stairsway for temporary scaffold

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2432623A (en) * 2005-06-27 2007-05-30 Acorn Corporate Services Ltd A scaffold stair unit which uses scaffolding tubes as stringers
GB2432623B (en) * 2005-06-27 2007-12-27 Acorn Corporate Services Ltd A Scaffold stair unit
GB2428729B (en) * 2005-06-27 2007-12-27 Acorn Corporate Services Ltd A scaffold stair unit
NL2007133C2 (en) * 2011-07-18 2013-01-21 Gorter Group B V TRAP.
WO2020248871A1 (en) * 2019-06-12 2020-12-17 善缘有限公司 Foldable and angularly adjustable ladder
GB2598034A (en) * 2019-06-12 2022-02-16 Charfont Ltd Foldable and angularly adjustable ladder
GB2598034B (en) * 2019-06-12 2023-09-06 Charfont Ltd Foldable and angularly adjustable ladder
CN113107350A (en) * 2021-03-15 2021-07-13 中国煤炭科工集团太原研究院有限公司 Ladder climbing mechanism for anchor rod drill carriage
CN113107350B (en) * 2021-03-15 2022-09-06 中国煤炭科工集团太原研究院有限公司 Ladder climbing mechanism for anchor rod drill carriage
CN113581386A (en) * 2021-08-11 2021-11-02 上海外高桥造船有限公司 Special-shaped vertical ladder for inclined bottom channel of cargo hold of ultra-large liquefied gas carrier and ship

Also Published As

Publication number Publication date
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