EP0438266A1 - Assemblage d'échelle à coulisse - Google Patents

Assemblage d'échelle à coulisse Download PDF

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Publication number
EP0438266A1
EP0438266A1 EP91300285A EP91300285A EP0438266A1 EP 0438266 A1 EP0438266 A1 EP 0438266A1 EP 91300285 A EP91300285 A EP 91300285A EP 91300285 A EP91300285 A EP 91300285A EP 0438266 A1 EP0438266 A1 EP 0438266A1
Authority
EP
European Patent Office
Prior art keywords
ladder
ladder section
section
chassis
strut
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Withdrawn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
EP91300285A
Other languages
German (de)
English (en)
Inventor
Robert Cronin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0438266A1 publication Critical patent/EP0438266A1/fr
Withdrawn legal-status Critical Current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
    • E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
    • E06C5/02—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members
    • E06C5/04—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic
    • 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
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/18—Devices for preventing persons from falling
    • E06C7/185—Devices providing a back support to a person on the ladder, e.g. cages

Definitions

  • This invention relates to an extension ladder assembly, and in particular to a self-supporting ladder assembly to be used, for example, for maintenance of street lamps, buildings and the like.
  • a telescopically extendable ladder assembly of the type comprising a wheeled chassis, a bottom ladder section pivotable on the chassis between a collapsed stored position against the chassis and an erect in-use position on the chassis and one or more top ladder sections, each ladder section having a pair of spaced-apart ladder sides interconnected by rungs; characterised in that there is provided a structure stabilising member interconnecting the rungs substantially centrally located between the sides of least a top ladder section.
  • the stabilising member is a hollow anti-torsion bar.
  • the hollow bar is of box-like section.
  • this construction resits both sway and torsion of the top ladder section while keeping down the weight of the top ladder section.
  • each ladder side is a framework formed by a pair of spaced-apart longitudinal members interconnected by a number of spaced-apart cross members.
  • the longitudinal members and rungs are all of hollow bar.
  • This particular construction allows the weight of the top ladder section to be kept low while maintaining strength.
  • To make the ladder secure for a person working at an upper end of the top ladder section there are three movements of the upper end of the top ladder section that have to be eliminated. Firstly bending of the upper end of the top ladder section relative to a lower end of the top ladder section about a transverse axis of the top ladder section. The relatively deep construction of ladder sides resists this bending.
  • a bottom ladder section is pivotally mounted on the chassis spaced-apart from a lower end of the bottom ladder section to provide a short rearwardly extending portion, the short rearwardly extending portion incorporating a counter-weight.
  • This rearwardly extending portion with a counter-weight advantageously makes it easier to pivot the ladder on the chassis and the ladder can easily be pivoted between the collapsed stored position and the erect in-use position by a single person.
  • support means for extension between the bottom ladder section and the chassis to maintain the ladder in the erect position, the support means comprising a strut framework pivotally attached adjacent an upper end of the bottom ladder section, the strut framework having a lower free end which is releasably engagable with a complementary strut receiver on the chassis remote from the pivotal mounting of the bottom ladder section.
  • a bracing member is provided extending between the lower end of the strut framework and spigots at each side of the bottom ladder section intermediate the ends of the bottom ladder section, the bracing member pivotally attached to the strut framework and having elongate slots which slidably engage the spigots to allow movement of the strut framework between a folded position against the bottom ladder section and a support position with the strut framework engaged in the strut receiver.
  • the bracing member when the ladder is in the erect position, advantageously supports the bottom ladder section resisting bending of the bottom ladder section in use when a person is on the top ladder section.
  • a chargeable motion damper is provided for the bottom ladder section to reduce speed of pivoting into the collapsed stored position and to assist raising.
  • the motion damper advantageously guards against damage to the ladder and/or chassis which might occur if the ladder was dropped onto the chassis too quickly. It further advantageously assists in initially pivoting the bottom ladder section away from the stored position.
  • a number of outriggers are pivotally mounted by pivot pins on the chassis, each outrigger having an associated locking pin spaced-apart from the pivot pin to releasably secure the outrigger against pivotal movement on the chassis, and an inner end of each outrigger being a close sliding fit between upper and lower guides on the chassis.
  • a work platform is provided at an upper end of the top ladder section.
  • the work platform is preferably pivotally mounted on the top ladder section for movement between a stored position against the top ladder section and a laterally extending working position.
  • the work platform incorporates a levelling device to adjust the level of the platform depending on the inclination of the ladder.
  • a work tray be pivotally mounted at the free end of the ladder.
  • tools may be incorporated and mounted on the ladder such as a winch for hauling materials from ground level to the work platform.
  • a ladder stabiliser is provided on the ladder, the stabiliser extendable laterally of the ladder for engagement against a wall or the like support surface adjacent the ladder in use.
  • the wheeled chassis forms a trailer for towing behind a vehicle, a number of outriggers being provided on the chassis operable to support the chassis during use of the ladder, the ladder being of two-part construction having a bottom ladder section and a top ladder section slidably mounted on the bottom ladder section, a winch for raising the top ladder section on the bottom ladder section, catch means for releasably supporting the top ladder section in an extended position on the bottom ladder section, the bottom ladder section pivotally mounted adjacent an end of the chassis spaced-apart from a lower end of the bottom ladder section to provide a short rearwardly extending portion which incorporates a counter-weight, a strut framework pivotally attached adjacent an upper end of the bottom ladder section and having a lower free end which is releasably engagable with a complementary strut receiver on the chassis, locking means being provided to releasably secure the strut framework in engagement with the strut receiver, a bracing member pivotally attached at its bottom end
  • the invention provides a ladder section having a pair of spaced-apart ladder sides interconnected by rungs, characterised in that there is provided a structure stabilising member interconnecting the rungs substantially centrally located between the sides of the ladder section.
  • the stabilising member is a hollow anti-torsion bar.
  • the hollow anti-torsion bar is of box-like section.
  • the ladder assembly 1 comprises a trailer chassis 2 with wheels 3, 4 and a tow-hitch 5.
  • the tow-hitch 5 is attached to a beam 6 which is telescopically mounted on the chassis 2 for movement between the stored position illustrated in Fig. 1 and an extended position in which the beam 6 projects forwardly of the chassis 2 for attachment of the tow-hitch 5 to a vehicle.
  • Pivotally mounted on the chassis 2 is an extendable ladder indicated generally by the reference numeral 10.
  • the ladder 10 is a two-part telescopic ladder having a bottom ladder section 12 and a top ladder section 13 slidably mounted on the bottom ladder section 12.
  • a winch 14 is provided on the bottom ladder section 12 to raise the top ladder section 13 on the bottom ladder section 12.
  • the ladder 10 is pivotal on the chassis 2 between a collapsed stored position against the chassis, as shown in Fig. 1 and an erect in-use position on the chassis as shown in Fig. 2.
  • the bottom ladder section 12 is pivotally mounted by pivot pins 15 on support arms 16 upstanding at a rear end of the trailer chassis 2.
  • the pivot pins 15 engage the bottom ladder section 12 spaced-apart from a lower end 18 of the bottom ladder section 12 so that the lower end 18 forms a short rearwardly extending ladder portion on the chassis 2.
  • the lower end 18 of the bottom ladder section 12 incorporates a counterweight 19.
  • the bottom ladder section 12 has a pair of spaced-apart bottom ladder sides 25 interconnected by rungs 26. Some of the rungs 26 on the bottom ladder section 12 may be formed as a step having a broad top formed by a plate or the like.
  • Each side 25 has an upper longitudinal member 27 and a lower longitudinal member 28 joined by a number of spaced-apart intermediate members 29.
  • the longitudinal members 27, 28 comprise a number of tubular steel sections; the cross-section of the tubular steel sections reducing towards an upper end of the bottom ladder section 12.
  • the longitudinal members are of box-section adjacent a lower end of the bottom ladder section 12.
  • Each of the intermediate members 29 comprises a curved plate having flattened ends for attachment to the upper longitudinal member 27 and lower longitudinal member 28.
  • the top ladder section 13 has a pair of spaced-apart top ladder sides 30 interconnected by rungs 32.
  • Each ladder side 30 is formed by a pair of spaced-apart tubular longitudinal members, namely, an upper longitudinal member 34 and a lower longitudinal member 35 interconnected by a number of spaced-apart cross members 36.
  • a tubular box-section anti-torsion member 38 is centrally attached to an underside of the rungs 32 running substantially parallel to the sides 30.
  • a foldable work platform 40 is provided, the work platform 40 being pivotal on the top ladder section 13 between a stored position against the top ladder section 13, as shown in Fig. 1 and a laterally extending working position as shown in Figs. 2 and 7. It will be noted that above the work platform 40 a safety hoop 41 is provided above the work platform 40 . In this case a winch 42 is mounted to the safety hoop 41 for raising and lowering materials from ground level up to the work platform 40.
  • the top ladder section may comprise two parts bolted together with an insulation block between the parts.
  • the top end of the ladder 10 and work platform 40 is electrically insulated from the ground.
  • catch means for releasably supporting the top ladder section 13 in an extended position on the bottom ladder section 12 is shown.
  • a latch 47 which is spring biassed against a stop 48 formed by one of the cross-members 29.
  • Both latches 47 are pivotally interconnected by a link arm 49 for simultaneous operation of the latches 47.
  • a rod 52 Connected to one latch 47 is a rod 52 which extends downwardly along a side of the bottom ladder section 12.
  • the latches 47 bear against each cross member 36 in turn and will be moved out of the way, immediately springing back into position.
  • the latches 47 When, however, the top ladder section 13 is released and a cross member 36 falls slightly backwards in the reverse direction, then the latches 47 will bear against the stop 48 and the top ladder section 13 will be secured relative to the bottom ladder section 12.
  • the latches 47 are released by pulling the rod 52 downwardly by means of a spring loaded operating handle 53 fixed adjacent a lower end of the bottom ladder section 12.
  • a catch (not shown) is provided to hold the operating handle 53 in the open position.
  • the latches 47 are held in the open position while the top ladder section 13 is lowered. Releasing the handle returns the latches 47 under the action of a spring 54, so the latches 47 bear against the stops 48.
  • Support means for the ladder comprising a strut framework 50 (see Fig. 2) pivotally attached at 51 adjacent an upper end 52 of the bottom ladder section 12.
  • a lower free end of the strut framework 50 is releasably engagable with a complementary strut receiver 56 at a front end of the chassis 2.
  • the strut framework 50 has tubular side members 58 interconnected by tubular members 59.
  • Lower ends 60 of the side members 58 terminate in a plate 63.
  • Intermediate the lower ends 60 is a cross-bar 65.
  • a U-shaped bracket 66 is attached to an underside of the cross-bar 65.
  • Brackets 68 at upper ends of the side members 58 have through holes 69 for engagement with pivot pins at the upper end 52 of the bottom ladder section 12 thus forming the pivot mounting at 51.
  • Each of the plates 63 at lower ends of the strut framework 50 engage with the strut receivers 56 on the chassis 2 which are V-shaped.
  • a bracing member 70 extends between the lower end 60 of the framework 50 and spigots 71 at each side of the bottom ladder section 12 intermediate the ends of the bottom ladder section 12.
  • the bracing member 70 is shown in Fig. 13 and is generally H-shaped having a pair of spaced-apart side members 74 connected intermediate their ends by a cross-member 75.
  • a through hole 76 At a lower end of each side member 74 is a through hole 76 to receive a bolt for pivotally securing the bracing member 70 to a lower end of the strut framework 50.
  • Upper ends of the side members 74 each have an elongate slot 78 which slidably engages the spigots 71 on the bottom ladder section 12.
  • the chassis 2 is shown and comprises a tubular support framework 80. At each corner of the framework 80 is pivotally mounted an outrigger 82 having a conventional ground engaging jack 83. Each outrigger 82 is mounted by a pivot pin 85 on the chassis 2. Each outrigger 82 has an associated locking pin 86 spaced-apart from the pivot pin 85 to releasably secure the outrigger 82 against pivotal movement on the chassis 2. An inner end 88 of each outrigger 82 is a close sliding fit between an upper guide 89 and lower guide 90 on the chassis 2 to allow substantially only lateral movement of the outrigger 82 relative to the chassis 2.
  • a chargeable motion damper indicated generally by the reference numeral 95 forming portion of the ladder assembly 1 is shown.
  • the motion damper 95 is mounted at a top of the chassis 2 at a rear end of the chassis 2.
  • the motion damper 95 comprises a channel section guide 96 having a central elongate slot 97.
  • a block 98 is slidable along the guide 96.
  • An upwardly directed peg 99 is provided on the block 98.
  • a spigot 100 Depending from the block 98 through the slot 97 is a spigot 100.
  • a spring 101 extends between the spigot 100 and an anchor point 102 at a front end 103 of the guide 96.
  • the block 98 is movable against spring pressure between a release position adjacent a front end 103 of the guide 96 and an extended charged position at a rear end 104 of the guide 96.
  • the cross bar 65 of the strut framework 50 engages with the peg 99 moving the block 98 towards the charged position, the spring 101 damping the collapsing motion of the ladder 10. It will also be appreciated that when subsequently raising the ladder 10 the action of the spring 101 will assist the pivoting action of the ladder 10 on the chassis 2.
  • the stabiliser 110 for use with the ladder assembly 1 is shown.
  • the stabiliser 110 comprises a rod 112 having at each end a block or pad of wood 113 or the like material for engaging against a wall or other support surfaces adjacent the ladder in use.
  • the rod 112 is slidably supported in brackets 116 on the strut framework 50, the brackets 116 having locking screws 117. Alternatively clamps may be used.
  • the ladder assembly 1 can conveniently be towed behind a vehicle to a work site. It is easily manouvered by a single operator into position and with the outriggers extended the chassis 2 is raised clear of the ground so that it is supported on the outriggers 82 in conventional fashion.
  • To raise the ladder 10 downward pressure is put on the lower end 18 of the bottom ladder section 12 adjacent the counter-weight 19 thus pivoting the ladder 10 about the pivot pins 15.
  • the strut framework 50 drops downwards and the bracing member 70 pivots about the lower end of the strut framework 50 and slides along the spigots 71 at each side of the bottom ladder section 12.
  • the bracing member 70 provides rigidity to the structure and resits any bending of the bottom ladder section 12 in the centre due to the weight of an operator on the work platform 40. As shown in Fig.
  • the ladder 10 is sufficiently rigid to allow further persons to stand on the bottom ladder section 12 to carry out work such as decorating a side wall 120 of a building 121.
  • the construction of the ladder 10 is such that it combines relatively light weight with a rigid construction and the ladder 10 can easily be manipulated by a single operator. It is also of very simple construction and thus easy and cheap and manufacture. Further, the only running gear is a winch to raise the top ladder section 13 on the bottom ladder section 12 and the winch for raising and lowering materials to the work platform. Thus it is very robust and reliable in operation.
  • the ladder assembly particularly answers the age old problem in the building and painting industry of getting men and materials to a temporary but safe place above the ground for a relatively short duration, thus eliminating the laborious and tine-consuming job of erecting short-term scaffolding ant the exasperating problem of trying to move the whole thing especially on uneven, stepped or sloping ground.
  • the ladder assembly provides a machine that can be manually operated and is very reliable and needs very little maintenance. It has a relatively long working life and is not expensive to produce and is of light weight construction. It can be raised to and lowered from the desired working position in seconds and can be easily manoeuvred by one man and is very simple in operation.
  • the ladder assembly is extremely reliable, even after lying idle in even the most hostile of environments.
  • the ladder assembly has just two springs one on the locking means for strut framework and the other on the motion damper. Two all-weather winches are used one for raising the extension and one for lifting materials to the work platform.
  • the ladder assembly is of steel hot sprayed with zinc to provide corrosion resistance.
  • the machine has no batteries, no hydraulics and no switches which could provide reliability problems.
  • the structure of the ladder is such that weight of the assembly is kept as low as possible while still maintaining the required strength and rigidity. The low weight is important to allow the easy raising and lowering of the ladder assembly on the chassis.
  • a staging may be suspended from the work platforms to accomodate two or three people, the staging being mounted by pulley blocks hooked onto eyes on the platforms which have the effect of keeping the platforms in the vertical position thus preventing their use by an operator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP91300285A 1990-01-15 1991-01-15 Assemblage d'échelle à coulisse Withdrawn EP0438266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE15190 1990-01-15
IE15190A IE900151A1 (en) 1990-01-15 1990-01-15 A Construction of Ladder

Publications (1)

Publication Number Publication Date
EP0438266A1 true EP0438266A1 (fr) 1991-07-24

Family

ID=11007762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91300285A Withdrawn EP0438266A1 (fr) 1990-01-15 1991-01-15 Assemblage d'échelle à coulisse

Country Status (2)

Country Link
EP (1) EP0438266A1 (fr)
IE (1) IE900151A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060939A (zh) * 2014-05-05 2014-09-24 浙江浙能嘉兴发电有限公司 一种供大型抓斗检修用的梯子
CN106837158A (zh) * 2017-03-22 2017-06-13 无锡市卡德姆机械科技有限公司 减震型工程爬梯
CN110284825A (zh) * 2019-06-18 2019-09-27 国网山东省电力公司烟台供电公司 一种电力用伸缩梯子
EP3599339A1 (fr) * 2018-07-25 2020-01-29 TRIAX Sàrl Dispositif d'acces a la partie superieure d'un vehicule de type camion citerne
CN112127788A (zh) * 2020-09-18 2020-12-25 安徽龙和电力集团有限公司 一种便于移动的电力检修平台及工作方式

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191006943A (en) * 1910-03-19 1910-11-17 Hadrian Bayley Improvements in Fire-escapes.
US1798070A (en) * 1929-09-05 1931-03-24 Charles M Dean Control for fire apparatus and the like
GB853823A (en) * 1957-03-28 1960-11-09 Otto Weinmann Mechanical extension ladder
US4094381A (en) * 1977-05-02 1978-06-13 Wilkerson Darrell F Aerial extension ladder
US4202428A (en) * 1974-03-14 1980-05-13 Inventec International Limited Ladder
FR2473614A1 (fr) * 1980-01-14 1981-07-17 Kinziger Claude Echelle telescopique
US4396093A (en) * 1981-01-19 1983-08-02 Zimmerman Mahlon N Ladder or boom extension system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191006943A (en) * 1910-03-19 1910-11-17 Hadrian Bayley Improvements in Fire-escapes.
US1798070A (en) * 1929-09-05 1931-03-24 Charles M Dean Control for fire apparatus and the like
GB853823A (en) * 1957-03-28 1960-11-09 Otto Weinmann Mechanical extension ladder
US4202428A (en) * 1974-03-14 1980-05-13 Inventec International Limited Ladder
US4094381A (en) * 1977-05-02 1978-06-13 Wilkerson Darrell F Aerial extension ladder
FR2473614A1 (fr) * 1980-01-14 1981-07-17 Kinziger Claude Echelle telescopique
US4396093A (en) * 1981-01-19 1983-08-02 Zimmerman Mahlon N Ladder or boom extension system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060939A (zh) * 2014-05-05 2014-09-24 浙江浙能嘉兴发电有限公司 一种供大型抓斗检修用的梯子
CN106837158A (zh) * 2017-03-22 2017-06-13 无锡市卡德姆机械科技有限公司 减震型工程爬梯
EP3599339A1 (fr) * 2018-07-25 2020-01-29 TRIAX Sàrl Dispositif d'acces a la partie superieure d'un vehicule de type camion citerne
FR3084393A1 (fr) * 2018-07-25 2020-01-31 Triax Sarl Dispositif d'acces a la partie superieure d'un vehicule de type camion-citerne
CN110284825A (zh) * 2019-06-18 2019-09-27 国网山东省电力公司烟台供电公司 一种电力用伸缩梯子
CN112127788A (zh) * 2020-09-18 2020-12-25 安徽龙和电力集团有限公司 一种便于移动的电力检修平台及工作方式

Also Published As

Publication number Publication date
IE900151A1 (en) 1991-07-17

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