GB2122572A - Working platform for extensible ladder or ladder-like mast - Google Patents

Working platform for extensible ladder or ladder-like mast Download PDF

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Publication number
GB2122572A
GB2122572A GB08216441A GB8216441A GB2122572A GB 2122572 A GB2122572 A GB 2122572A GB 08216441 A GB08216441 A GB 08216441A GB 8216441 A GB8216441 A GB 8216441A GB 2122572 A GB2122572 A GB 2122572A
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United Kingdom
Prior art keywords
ladder
platform
mast
stiles
rollers
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.)
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Application number
GB08216441A
Inventor
Derek Harcourt Matthews
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.)
Curt Lennart Nyman
Original Assignee
Curt Lennart Nyman
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 Curt Lennart Nyman filed Critical Curt Lennart Nyman
Priority to GB08216441A priority Critical patent/GB2122572A/en
Publication of GB2122572A publication Critical patent/GB2122572A/en
Withdrawn legal-status Critical Current

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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

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

Abstract

An extensible ladder or ladder- like mast (1), to be used in a substantially vertical position adjacent a wall (W) or the like, carries a working platform (2) which can be moved up or down the mast (1) and locked by catch mechanism (3) in a required position of use, and is provided with guide means (20) for guiding it in relation to one or the other of the sections (10, 11) of the ladder or mast and for change over guidance at the overlap of the sections (10, 11). The guide means (20) may consists of rollers (23, 24, 25) rotatable about transverse axes in frames (22) of the platform (2) and in guiding contact with the edges of the ladder or mast stiles (100, 110), the mid rollers (24) running between the sections (10, 11) at their overlap for changeover guiding contact with opposed edges of the stiles (100, 110). <IMAGE>

Description

SPECIFICATION Scaffold structure This invention relates to scaffold structure of the kind consisting of a ladder or ladder-like mast arranged to assume a substantially upright position when in use adjacent a wall or similar surface, the ladder or mast carrying a working platform which can be moved up or down the ladder and locked in a required position of use to provide convenient support for a person together with tools etc., operating from the ladder. Such a scaffold structure or "climber" is set forth in the specification of my British Patent No. 1,314,696.
The object of the invention is to provide an extendible arrangement of such scaffold structure to facilitate its use especially when access to a high position is required.
According to this invention, scaffold structure of the kind referred to is characterisd by the ladder or ladder-like mast consisting of at least two relatively slidable sections for length or height extension, the platform having guide means adapted for guiding engagement with one section or the other of the extended ladder or mast, i.e. with a change over action and according to the direction of movement of the platform up or down the ladder or mast.
A practical example of the scaffold structure together with modifications is shown in the accompanying drawings in which: Figure 1 is a side elevation of the platform on the extended ladder or mast, Figure 2 is a sectional plan view taken on the line ll-ll of Fig. 1, Figures 3 to 5 are sectional plan views similar to Fig. 2 but each showing a modification, and Figure 6 is a sectional plan view showing a further development, Like parts are referred to by the same or similar reference numerals throughout the drawings.
The ladder or ladder-like mast 1 is shown comprising a main or lower section 10 and a relatively slidable extension section 11 in a similar manner to an extendible ladder.
When in use the ladder or mast 1 is supported in a substantially vertical position spaced from a wall W or other generally upright surface or the like to which access is required, i.e. by means of a stand off support or spreader 1 2 carried by the upper end of the extension 11 whilst the lower section 10 is shown provided with outwardly splayed legs 1 4 for stability.
In the manner described in my aforesaid prior patent, the platform 2 is arranged to be moved up or down the ladder 1 by a person ascending or descending it, the platform 2 being attached by a strap indicated at 21 and which passes over the shoulders and behind the neck of the person so that the suspended platform moves with him as he climbs up or down the ladder 1.
Catch mechanism 3 is provided for engaging a rung 1 3 of the ladder 1 in order to lock the platform 2 at a required position of use, the catch mechanism 3 being releasable by a lever 30 operable by the person on the ladder 1 when it is required to move up or down the ladder. The particular action of the catch mechanism 3 shown is described later.
The platform 2 is shown positioned on the inner side of the ladder 1, i.e. adjacent the wall W so that the person works with his back to the ladder 1 over the safety rail 29.
Having regard to the extendible arrangement of the ladder 1 and in accordance with this invention the platform 2 is provided with guide means 20 arranged to engage either the lower section 10 or the extension section 11 or both of them in the region where they overlap and with a change over action as the platform 2 is moved up or down the ladder 1 so that firm location of the platform 2 is maintained as it passes from one ladder section to the other.
Referring to Fig. 1 the upper and lower parts of the platform 2 are rigidly provided with a frame 22 of the guide means 20 which frames 22 embrace the ladder 1, each frame 22 carrying three pairs of spaced apart rollers 23, 24, 25 rotatable about respective spaced apart transverse axes, the mid pair of rollers 24 together with the outer pair 23 of the lower frame 22 being shown engaging the stiles 100 of the lower ladder section 10 by rolling contact with opposite side edges of the stiles 100. When the platform 2 is fully on the extension section 11, the inner pair of rollers 25 and the mid pair 24 engage the stiles 110 in a similar manner.
As also shown in the case of the upper frame 22, the mid pair of rollers 24 run between the adjacent edges of the stiles 100, 110 of the overlapping ladder sections 10, 11 with the outer and inner pairs 23, 25 contacting outer edges of respective stiles 100, 110.
As will be appreciated the platform 2 is securely and safely guided for smooth movement up and down the extended ladder 1 with the guide rollers 23, 24, 25 able to readily negotiate the region of overlap of the sections 10, 11.
In order to guide the pair of rollers 23, 24, 25 as they move into and out of the region of overlap, the adjacent ends of the stiles 100, 110 are shown of rounded form for guiding the rollers and avoiding possible jamming abutment.
The arrangement of the guide rollers 24, 25 of the upper or lower frame 22 is shown in Fig. 2, i.e. where the ladder sections 10, 11 are of the same width with their stiles 100, 110 aligned with one another, retaining members 1 5 e.g. from the extension section 11 slidably engaging respective grooves 1 6 or other suitable guideways in the stiles 100 of the lower section 10.
Referring to Figs. 3 to 5 the arrangement of frames 22 and guide rollers 23, 24, 25 are shown to suit alternative arrangements of extendible ladder, i.e. where a narrower extension section 11 is slidable between the stiles 100 of the lower section 10 (Fig. 3),.or where the stiles 100, 110 are of interfitting I-section (Fig. 4) or are of interfitting channel section (Fig. 5). In Fig. 3 the inner rollers 23 contact track members 11 3 on the stiles 110 of the extension section 11.
In the above described arrangements the outer and inner pairs of rollers 23, 25 may be carried by transverse shafts 26 but the mid pair 24 require to be mounted by stub shafts 27 or similar support in view of intervening ladder structure.
In Fig. 6 outer or extended side structure 220 of the roller frame is shown for providing in particular adequate stub axle support at 27 for the mid rollers 24 whilst in this Figure the rollers 23, 24, 25 are also shown flanged at 230, 240 and 250 to maintain clearance between the ladder stiles 100, 110 and adjacent side members of the frame 22.
The upper and lower frames 22 should be rigidly secured to the platform 2 and are also shown braced at 28 from one another. The base 200 of the platform 2 may be foldable and is mounted from the upper frame 22 by side members 210 with attachment to the lower frame 22.
The rollers 23, 24, 25 may lie in the same plane in the frames 22 as shown or may lie in different planes and/or may be of different diameter. Instead of rollers, guide members carried by the frames 22 and having sliding contact with the stiles 100, 110 may be employed.
Having regard to the off set of the extension section 11 from the lower section 10, the catch mechanism 3 (Fig. 1) is shown of suitable form for engagement with a rung 1 3 of one or the other of the sections 10, 11.
Preferably a pair of catch members or hooks 33 are provided each pivotally mounted by a cranked arm 31 from the upper roller frame 22 e.g. from the outer roller shaft 26 of the latter and fast with a suitably formed lower part 300 of the release lever 30. The arrangement is such that the offset weight of the lever 30 causes it to swing away from the ladder for bringing each hook 33 in engagement with a rung 1 3 as shown in the dotted line position, the lever 30 being moved to the position shown in full for release of the hooks 33 from a rung 1 3 of either section 10 or 11 when it is required to move the platform 2 up or down the ladder 1.Such tendency of the hooks 33 to otherwise automatically engage a rung 1 3 largely avoids inadvertent descent of the platform 2 whilst the catch mechanism 3 may be spring loaded for the purpose.
The upper part of each catch member or hook 33 is shown provided with an inclined deflecting portion or head 330 for deflecting it clear of a rung 1 3 during upward movement of the platform and thus avoid or minimise hindrance of such movement.
In use the ladder 1 can be extended to a required height up a wall or the like and the platform 2 readily operated to any position regardless of the extension effected. This facilitates handling and positioning of the ladder compared with the use of a long ladder or mast or a rigid assembly thereof.
The invention is applicable to extendible ladder or mast assemblies having more than two relatively slidable sections and with appropriate guide roller or similar arrangements.
CLAIMS (3 Mar 1983) 1. Scaffold structure of the kind referred to characterised by the ladder or ladder-like mast consisting of at least two relatively slidable sections for length or height extension, the platform having guide means adapted for guiding engagement with one section and/or the other of the extended ladder or mast, i.e.
with a change over action and according to the direction of movement of the platform up or down the ladder or mast.
2. Scaffold structure according to claim 1 wherein the platform is provided with upper and lower guide means for guiding engagement with one section and/or the other of the extended ladder or mast.
3. Scaffold structure according to claim 1 or 2 wherein the guide means includes guide members supported from the platform for guiding contact with outer edges of respective stiles of the ladder or mast sections and further intermediate guide members for guiding contact with one or the other of opposed edges of the stiles or with either or both the opposed edges for changeover guiding contact when between the sections at the region of overlap of the latter.
4. Scaffold structure according to claim 3 wherein the guide members are supported from the platform by frame means arranged to embrace either or both sections of the ladder or mast.
5. Scaffold structure according to claim 3 or 4 wherein the guide members consist of laterally spaced apart rollers rotatably supported from the platform about transverse axes in relation to the ladder or mast sections.
6. Scaffold structure according to claims 4 and 5 wherein the guide rollers are rotatably carried within the frame means.
7. Scaffold structure according to any of the preceding claims wherein the adjacent ends of stiles of the ladder or mast sections are formed for deflecting the guide means against possible jamming abutment therewith.
8. Scaffold structure according to any of
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    11 slidably engaging respective grooves 1 6 or other suitable guideways in the stiles 100 of the lower section 10.
    Referring to Figs. 3 to 5 the arrangement of frames 22 and guide rollers 23, 24, 25 are shown to suit alternative arrangements of extendible ladder, i.e. where a narrower extension section 11 is slidable between the stiles 100 of the lower section 10 (Fig. 3),.or where the stiles 100, 110 are of interfitting I-section (Fig. 4) or are of interfitting channel section (Fig. 5). In Fig. 3 the inner rollers 23 contact track members 11 3 on the stiles 110 of the extension section 11.
    In the above described arrangements the outer and inner pairs of rollers 23, 25 may be carried by transverse shafts 26 but the mid pair 24 require to be mounted by stub shafts 27 or similar support in view of intervening ladder structure.
    In Fig. 6 outer or extended side structure 220 of the roller frame is shown for providing in particular adequate stub axle support at 27 for the mid rollers 24 whilst in this Figure the rollers 23, 24, 25 are also shown flanged at 230, 240 and 250 to maintain clearance between the ladder stiles 100, 110 and adjacent side members of the frame 22.
    The upper and lower frames 22 should be rigidly secured to the platform 2 and are also shown braced at 28 from one another. The base 200 of the platform 2 may be foldable and is mounted from the upper frame 22 by side members 210 with attachment to the lower frame 22.
    The rollers 23, 24, 25 may lie in the same plane in the frames 22 as shown or may lie in different planes and/or may be of different diameter. Instead of rollers, guide members carried by the frames 22 and having sliding contact with the stiles 100, 110 may be employed.
    Having regard to the off set of the extension section 11 from the lower section 10, the catch mechanism 3 (Fig. 1) is shown of suitable form for engagement with a rung 1 3 of one or the other of the sections 10, 11.
    Preferably a pair of catch members or hooks 33 are provided each pivotally mounted by a cranked arm 31 from the upper roller frame 22 e.g. from the outer roller shaft 26 of the latter and fast with a suitably formed lower part 300 of the release lever 30. The arrangement is such that the offset weight of the lever 30 causes it to swing away from the ladder for bringing each hook 33 in engagement with a rung 1 3 as shown in the dotted line position, the lever 30 being moved to the position shown in full for release of the hooks 33 from a rung 1 3 of either section 10 or 11 when it is required to move the platform 2 up or down the ladder 1.Such tendency of the hooks 33 to otherwise automatically engage a rung 1 3 largely avoids inadvertent descent of the platform 2 whilst the catch mechanism 3 may be spring loaded for the purpose.
    The upper part of each catch member or hook 33 is shown provided with an inclined deflecting portion or head 330 for deflecting it clear of a rung 1 3 during upward movement of the platform and thus avoid or minimise hindrance of such movement.
    In use the ladder 1 can be extended to a required height up a wall or the like and the platform 2 readily operated to any position regardless of the extension effected. This facilitates handling and positioning of the ladder compared with the use of a long ladder or mast or a rigid assembly thereof.
    The invention is applicable to extendible ladder or mast assemblies having more than two relatively slidable sections and with appropriate guide roller or similar arrangements.
    CLAIMS (3 Mar 1983) 1. Scaffold structure of the kind referred to characterised by the ladder or ladder-like mast consisting of at least two relatively slidable sections for length or height extension, the platform having guide means adapted for guiding engagement with one section and/or the other of the extended ladder or mast, i.e.
    with a change over action and according to the direction of movement of the platform up or down the ladder or mast.
    2. Scaffold structure according to claim 1 wherein the platform is provided with upper and lower guide means for guiding engagement with one section and/or the other of the extended ladder or mast.
    3. Scaffold structure according to claim 1 or 2 wherein the guide means includes guide members supported from the platform for guiding contact with outer edges of respective stiles of the ladder or mast sections and further intermediate guide members for guiding contact with one or the other of opposed edges of the stiles or with either or both the opposed edges for changeover guiding contact when between the sections at the region of overlap of the latter.
    4. Scaffold structure according to claim 3 wherein the guide members are supported from the platform by frame means arranged to embrace either or both sections of the ladder or mast.
    5. Scaffold structure according to claim 3 or 4 wherein the guide members consist of laterally spaced apart rollers rotatably supported from the platform about transverse axes in relation to the ladder or mast sections.
    6. Scaffold structure according to claims 4 and 5 wherein the guide rollers are rotatably carried within the frame means.
    7. Scaffold structure according to any of the preceding claims wherein the adjacent ends of stiles of the ladder or mast sections are formed for deflecting the guide means against possible jamming abutment therewith.
    8. Scaffold structure according to any of
    the preceding claims wherein the platform carries releasably operable catch means adapted to engage a rung of one or the other of the ladder or mast sections.
    9. Scaffold structure according to claim 8 wherein the catch means is provided with deflecting means for deflecting it clear of a rung during upward movement of the platform on the ladder or mast.
    10. Scaffold structure of the kind referred to substantially as herein described with reference to Figs. 1 and 2 or to Figs. 3, 4, 5 or 6 of the accompanying drawings.
    11. A platform for scaffold structure of the kind referred to having guide means according to any of claims 1 to 10.
GB08216441A 1982-06-05 1982-06-05 Working platform for extensible ladder or ladder-like mast Withdrawn GB2122572A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08216441A GB2122572A (en) 1982-06-05 1982-06-05 Working platform for extensible ladder or ladder-like mast

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08216441A GB2122572A (en) 1982-06-05 1982-06-05 Working platform for extensible ladder or ladder-like mast

Publications (1)

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GB2122572A true GB2122572A (en) 1984-01-18

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GB08216441A Withdrawn GB2122572A (en) 1982-06-05 1982-06-05 Working platform for extensible ladder or ladder-like mast

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838283A1 (en) * 1988-11-11 1990-05-17 Peter Kralj Facade lift

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB359942A (en) * 1930-07-28 1931-10-28 Franz Hetzelberger Improvements in fire escapes
GB362028A (en) * 1930-09-12 1931-12-03 Franz Hetzelberger Improvements in fire escapes
GB814546A (en) * 1956-06-13 1959-06-10 Ramsay & Sons Forfar Ltd Improvements in extensible ladders

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB359942A (en) * 1930-07-28 1931-10-28 Franz Hetzelberger Improvements in fire escapes
GB362028A (en) * 1930-09-12 1931-12-03 Franz Hetzelberger Improvements in fire escapes
GB814546A (en) * 1956-06-13 1959-06-10 Ramsay & Sons Forfar Ltd Improvements in extensible ladders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838283A1 (en) * 1988-11-11 1990-05-17 Peter Kralj Facade lift

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