WO2006067448A1 - Plate-forme de travail élevée avec appareil à harnais de sécurité - Google Patents

Plate-forme de travail élevée avec appareil à harnais de sécurité Download PDF

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Publication number
WO2006067448A1
WO2006067448A1 PCT/GB2005/004988 GB2005004988W WO2006067448A1 WO 2006067448 A1 WO2006067448 A1 WO 2006067448A1 GB 2005004988 W GB2005004988 W GB 2005004988W WO 2006067448 A1 WO2006067448 A1 WO 2006067448A1
Authority
WO
WIPO (PCT)
Prior art keywords
work platform
platform according
elongate flexible
mounting
flexible element
Prior art date
Application number
PCT/GB2005/004988
Other languages
English (en)
Inventor
Peter Ward
George Marcus Grundy
Simon Mitchell
Ian Lawton
Original Assignee
Spanset Inter A.G.
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 Spanset Inter A.G. filed Critical Spanset Inter A.G.
Publication of WO2006067448A1 publication Critical patent/WO2006067448A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms

Definitions

  • the present invention relates to a work platform for use at elevated work areas and safety restraint apparatus therefor. More particularly it related to a mobile elevated work platform of the kind that is usually fitted to a vehicle and can be raised to access an elevated work area and lowered to allow workers to alight from or mount the platform.
  • Mobile elevated work platforms are used to gain access to aerial work areas such, for example, tall buildings, street lighting, trees etc.
  • the platform often referred to in the field as a "basket”, has a floor and perimeter guard rails intended to prevent a worker from moving outside the floor area.
  • the platform is typically mounted on to or towed behind a vehicle on the end of a telescopic arm that can be extended to provide access to a work area and retracted when not in use.
  • Lanyards of the kind referred to above can often be too long and tend to trail on the floor of basket where they are a tripping hazard. Shorter lengths are available as are adjustable lengths but they still tend to be a tripping hazard or hinder the user's working efficiency. Moreover, such lanyards do not incorporate fall arrest devices that serve to arrest the descent of a worker in the event of a fall. The lack of energy absorbing capacity in such lanyards means that if a fall does occur the potential load applied to the MEWP, and in particular the arm, will exceed its load specification. This can result in the arm swaying or bending dangerously such that the faller bounces up and down and risks collision with surrounding structures. It can even carry the risk of the MEWP vehicle toppling over, particularly if the arm is extended to its full vertical height.
  • Fall arrest lanyards incorporate energy absorbers that are commonly in the form of overlapping layers of webbing that, in the event of a predetermined tensile force being applied to them, serve to absorb the energy of the fall through overcoming friction or stitching between them. Whilst this can reduce the impact of the fall it does not counter all of the disadvantages referred to above. In particular, the impact force can be up to 6kN and deployment of shock absorbing material will increase the clearance height required and therefore the device has to be located in an overhead position.
  • the use of inertia reel type fall arrest devices is known but they are not suitable for use in MEWP baskets as they require anchorages above the user in order to limit the force and the fall distance. Generally there is no suitable structure in the basket to allow the device to be located above head height. The nature of these devices is such that they do not restrict the movement of a user in order to prevent falls but are rather intended to arrest those falls.
  • a work platform for use at elevated locations comprising a floor surrounded by perimeter guard rails and safety restraint apparatus, the apparatus comprising at least one retractable elongate flexible element having a first end secured to a mounting on the platform and a second end with a connector for connection to a harness of a user, the safety restraint apparatus being configured to prevent a user moving outside the guard rails.
  • the use of a retractable elongate flexible element ensures that the it does not trail on the floor or otherwise hinder the user but still serves as a work restraint.
  • the mounting is preferably disposed at or below the height of the rails above the floor.
  • the safety restraint apparatus is preferably configured such that the elongate flexible element has a maximum length that does not exceed the distance between the mounting and the perimeter rail in any direction.
  • the restraint apparatus may comprise two elongate flexible elements for connection to the same user, the elongate flexible elements being connected to mountings at opposed locations at or adjacent to the rails.
  • the mounting may be disposed in the centre of the platform.
  • the mounting may comprise a bracket fixed to floor and may comprise a member that extends above or below the floor with the first end of the elongate flexible element being connected to said member.
  • the member may be an upright.
  • the mounting may have a swivel connection to ensure that the elongate flexible element is correctly oriented with respect to a user.
  • the elongate flexible element is ideally retractable into a housing that is connected to said mounting in which case the housing may be connected such that it can swivel relative to the mounting.
  • the first end of the elongate flexible element is preferably wound around a rotary reel which may be rotatably mounted in a cassette.
  • the cassette is ideally disposed in the housing which has an aperture through which the elongate flexible element egresses.
  • the reel is ideally biased to rotate in one direction so as to retract the elongate flexible element.
  • the platform may be connected to an extensible arm.
  • the platform and arm are preferably mobile and may be connected to a vehicle for this purpose.
  • the elongate flexible element is preferably webbing or cable. It is to be understood that the safety restraint apparatus may comprise more than one elongate flexible element, one being provided for each potential occupant. The capacity of the work platform will determine the number of elements required.
  • Figure l is a perspective view of safety restraint apparatus forming part of the present invention.
  • Figure 2 is a schematic side view of a work platform according to the present invention showing three different mounting positions for the safety restraint apparatus of figure 1 ;
  • Figure 3 is a plan view of a work platform of the present invention fitted with safety restraint apparatus of the present invention and illustrating the operating range;
  • Figure 4 is a plan view of a work platform of the present invention fitted with two safety restraint apparatuses of the present invention and illustrating the respective operating ranges.
  • safety restraint apparatus 10 for use in the present invention. It comprises an elongate length of retractable synthetic webbing 11 of conventional design that is stowed on a rotary reel 12 of a cassette 13 within a housing 14. A first end 15 of the webbing 11 extends from the periphery of the reel 12 out of an aperture 16 in the housing 14 and has a karabiner 17 at one end that is connectable, in use, to a harness of a user (not shown).
  • a second end of the webbing 11 is fixed to and wound around the reel 12.
  • the webbing 11 is extended out of the housing 14 by pulling on the second end so as to rotate the reel 12 and to unwind the webbing from the reel 12.
  • the reel 12 is biased to rotate in the opposite direction by a torsion spring or the like so as to retract the webbing 11 into the housing 14 when no opposing force is applied so as to assume the stowed configuration.
  • It also has a centrifugal based locking system, of the kind found in the seatbelt cassette in a vehicle, that prevents sudden rotational acceleration of the reel and therefore rapid pay out of the webbing 11.
  • a cassette of this kind is available from Spanset Limited and is used exclusively in fall arrest devices.
  • the safety apparatus 10 is shown in three alternative positions A, B and C on a work platform 20.
  • the platform 20 is mounted on the end of a telescopic arm on a vehicle (neither the arm nor the vehicle are shown in the figures) such that it can be selectively raised towards an elevated work area or lowered towards the vehicle.
  • the platform 20 is in the form of a basket comprising a floor 21 and perimeter rails 22 that are designed to prevent a worker moving out of the basket when in an elevated position. Access to the basket is provided by a gate G in the rails that is lockable in a closed position when the platform 20 is in use.
  • the safety restraint cassette 13 is fitted with a roller 23 adjacent to the housing aperture 16. The roller 23 serves to ensure that the webbing 11 pays out in the correct direction and does not become twisted during retraction.
  • the retractable safety restraint apparatus 10 is mounted to the underside of the floor 21 by a mounting bracket 24 that comprises a base 25 bolted to the floor 21 and an upright member 26.
  • a rear wall 27 of the cassette housing 14 is fixed to upright member 26 of the bracket 24 and the webbing 11 passes upwards through a gap in the floor 21 to be connected by the karabiner 17 to a harness worn by the user.
  • the webbing 11 is of a predetermined length such that it does not allow the user to move outside of the rails 22 or outside of a predefined safe working zone.
  • the arrangement of position C shows a high-level mounting bracket 24" that is fixed to the floor 21 in the same way as the arrangement of position B.
  • the upright member 26" is significantly longer than that of the previous embodiments and the cassette housing 14" is fixed at the top of the upright member 26".
  • the mounting bracket is the attachment point on the structure of the platform to which the user can connect in that it provides the mounting point for the cassette housing 14.
  • the lateral position of the safety restraint apparatus 10 within the basket is for illustrative purposes only and it will be appreciated that it may be positioned at any convenient location, but typically in the centre of the basket.
  • the bracket is mounted centrally so as to provide an operating range as illustrated in figure 3.
  • the maximum pay out length of the webbing 11 is designed so as to restrain the worker from moving outside the perimeter of the floor 21.
  • the basket is occupied by two workers each with a separate retractable restraint apparatus 10a and 10b.
  • the brackets 24a and 24b are spaced from the centre of the basket such that the operating range of each worker is confined to only one side of the basket with just a small area of overlap between the respective ranges as shown by the circles.
  • the upright member 26 of the bracket 24 may have a swivel design so that the cassette 13 is always suitably oriented as the worker moves around the basket.
  • safety restraint apparatus any suitable arrangement of safety restraint apparatus may be used.
  • two separate restraints may be disposed at opposed spaced locations at the perimeter of the basket and each connected to the same harness of the user.
  • the webbing may be replaced by any form of suitable elongate flexible element such as a cable or chain etc.
  • the safety restraint apparatus design of the present invention can be "retrofitted" to existing MEWPs or may be incorporated as standard as part of the original design and construction by the MEWP manufacturer.
  • the cassette 13 is removable from the mounting bracket 24 so that it is interchangeable with other cassettes offering different webbing lengths.
  • the cassettes and/or the housings may be colour-coded and/or labelled to indicate the webbing length.
  • centrifugal locking system is not essential to the restriction of movement of the user as the ultimate length of the webbing, when fully extended, is the determining factor in preventing the user go beyond the limit of the perimeter guard rail.
  • the locking system is an optional feature that has the benefit of restricting the travel of the user in the event of unintentional or unexpected movement of the MEWP.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Emergency Lowering Means (AREA)

Abstract

Plate-forme de travail élevée mobile (20) à utiliser sur des lieux de travail élevés possédant une nacelle au bout d’un bras télescopique. La nacelle possède un plancher entouré d’une rambarde sur son périmètre (22) et est équipée d’un appareil de sécurité à harnais (10) comportant au moins un élément flexible allongé rétractable comme une toile à sangles (11). Une extrémité de la toile à sangles (11) est enroulée autour d’une bobine rotative d’une cassette à l’intérieur d’un logement, l’autre extrémité étant dotée d’un raccord qui, lors de l’utilisation, est relié au harnais d’un utilisateur. La cassette est montée à un support qui est fixé à la plate-forme (20). L’agencement fournit une sécurité de travail qui empêche à un travailleur de sortir d’une zone de sécurité désignée et qui évite aux sangles d’être dangereuses en risquant de faire trébucher quelqu’un.
PCT/GB2005/004988 2004-12-23 2005-12-21 Plate-forme de travail élevée avec appareil à harnais de sécurité WO2006067448A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0428179.6 2004-12-23
GB0428179A GB2421486A (en) 2004-12-23 2004-12-23 Elevated work platform with safety restraint apparatus

Publications (1)

Publication Number Publication Date
WO2006067448A1 true WO2006067448A1 (fr) 2006-06-29

Family

ID=34113125

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004988 WO2006067448A1 (fr) 2004-12-23 2005-12-21 Plate-forme de travail élevée avec appareil à harnais de sécurité

Country Status (2)

Country Link
GB (1) GB2421486A (fr)
WO (1) WO2006067448A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10519014B2 (en) 2017-06-30 2019-12-31 Mezzanine Safeti-Gates, Inc. Safety barrier for loading dock lift

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210284513A1 (en) * 2020-03-12 2021-09-16 Kile Stephen Nuehring System and Method of Managing a Lift Accident

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852692A (en) * 1988-06-30 1989-08-01 Davey Roofing, Inc. Roofing safety device
US6092623A (en) * 1999-06-25 2000-07-25 Collavino; Loris Safety anchor system
US6330931B1 (en) * 1998-09-30 2001-12-18 Paul D. Baillargeon Fall protection system and method
US20020170783A1 (en) * 2001-05-17 2002-11-21 Goode Alexander George Nelson Fall arrest platform
US20040197165A1 (en) * 2003-04-03 2004-10-07 Simmons Robert J. Building-erection structural member transporter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852692A (en) * 1988-06-30 1989-08-01 Davey Roofing, Inc. Roofing safety device
US6330931B1 (en) * 1998-09-30 2001-12-18 Paul D. Baillargeon Fall protection system and method
US6092623A (en) * 1999-06-25 2000-07-25 Collavino; Loris Safety anchor system
US20020170783A1 (en) * 2001-05-17 2002-11-21 Goode Alexander George Nelson Fall arrest platform
US20040197165A1 (en) * 2003-04-03 2004-10-07 Simmons Robert J. Building-erection structural member transporter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10519014B2 (en) 2017-06-30 2019-12-31 Mezzanine Safeti-Gates, Inc. Safety barrier for loading dock lift

Also Published As

Publication number Publication date
GB2421486A (en) 2006-06-28
GB0428179D0 (en) 2005-01-26

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