EP2828193B1 - Dispositif de levage de charge - Google Patents

Dispositif de levage de charge Download PDF

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Publication number
EP2828193B1
EP2828193B1 EP13724311.9A EP13724311A EP2828193B1 EP 2828193 B1 EP2828193 B1 EP 2828193B1 EP 13724311 A EP13724311 A EP 13724311A EP 2828193 B1 EP2828193 B1 EP 2828193B1
Authority
EP
European Patent Office
Prior art keywords
lifting device
load lifting
support means
gas
outer housing
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.)
Active
Application number
EP13724311.9A
Other languages
German (de)
English (en)
Other versions
EP2828193B8 (fr
EP2828193A1 (fr
Inventor
Mark Richardson
Brian King
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.)
Power Towers Ltd
Original Assignee
Power Towers 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 Power Towers Ltd filed Critical Power Towers Ltd
Publication of EP2828193A1 publication Critical patent/EP2828193A1/fr
Publication of EP2828193B1 publication Critical patent/EP2828193B1/fr
Application granted granted Critical
Publication of EP2828193B8 publication Critical patent/EP2828193B8/fr
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Anticipated expiration legal-status Critical

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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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • 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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/02—Stationary loaders or unloaders, e.g. for sacks

Definitions

  • This invention relates to a load lifting device.
  • Load lifting devices come in a variety of different forms often providing a flat working platform suitable for carrying a load which is raisable to different heights. This allows ready access to elevated regions, for example when stacking shelves in a warehouse.
  • a load lifting device according to the preamble of claim 1 is known from WO 2012/024378 A2 .
  • a load lifting device comprising a platform fixed to an extendible support means comprising an inner and outer housing, the inner housing nestable within the outer housing, wherein at least one gas strut is located within the extendible support means and an actuation means is associated with the extendible support means, the actuation means operable to enable extension of the extendible support means, characterised in that the actuation means comprises a pulley system, the pulley system comprising a drive loop located within the outer housing and permanently fixed to the inner housing.
  • the gas strut reduces the force needed to operate the actuation means as the gas strut will at least partially counteract the weight of the platform and any load carried by it.
  • the gas strut is located within the extendible support means, the gas strut acting to urge the support means to an extended position. This can be used where load lifting devices are used to access elevated areas, for example with the support means preferably extending vertically.
  • the actuation means, or actuation system may be electrically powered, for example by batteries or be manually operable as such load lifting devices are often used in environments without ready access to electricity.
  • the support means preferably comprises at least two elements linearly slidable with respect to each other.
  • the support means comprises an inner and outer housing, the inner housing nestable within the outer housing. When the support means is in an unextended position, the inner housing will fully nest within the outer housing. As the actuation means is operated and the support means extends, the inner and outer housings move relative to each other with the gas strut urging against the outer housing so as to partially support the mass of the platform and the associated load. Typically the inner housing will be static, the outer housing moved relative to the static inner housing.
  • the actuation means comprises a pulley system which is of advantage as it is robust, simple to use and inexpensive.
  • a pulley system may utilise belts, toothed belts, chains, wire ropes and the like.
  • a portion of the actuation means may be permanently fixed to at least one housing so that operation of the actuation means moves the housings relative to each other.
  • the drive loop such as a belt is located within the outer housing and external to the inner housing, and is permanently fixed to the inner housing so that the inner housing moves in response to movement of the belt.
  • the pulley system comprises a drive band fixed with respect to one of the elements and passing around at least two pulley wheels fixed with respect to the other element.
  • two gas struts may be used and located within the support means, held in a fixed relationship to each other to act along a common axis, typically a vertical axis. In such an arrangement an end of one strut will act on one end of the second strut.
  • Each gas strut may engage with a common guide means, the guide means acting as an interface between the gas struts, controlling positioning of the gas struts within the support means.
  • Figure 1 shows a mobile load lifting device 10 comprising base 12 to which are attached four wheels 14 and upright support or mast 16 to which is affixed elevatable work platform 18.
  • Support 16 comprises nested inner and outer housings 20, 22, moveable relative to each other by attached pulley mechanism 24 when operated by external crank handle 26.
  • a protective cover 28 prevents items being inadvertently trapped in pulley mechanism 24.
  • Inner and outer tubular housings 20, 22 are typically made from steel and are hollow with a rectangular cross-section. Outer housing 20 is closed at its uppermost end by face 29 whereas inner housing 20 is open at both ends so that two co-operating gas struts 30, 30' located centrally within inner housing 20 urge against face 29 and base 12.
  • the two gas struts 30, 30' are fixed with respect to each other by securing to a guide means in the form of wheeled trolley 31.
  • Guide wheels 32, 33 are located on the external face of inner section 20 and the internal face of outer section 22 respectively so as to guide the sections 20, 22 as they move relative to each other.
  • Pulley mechanism 24 comprises fixed pulley wheels 34, 36 located on an inner face of outer housing 22, see Figure 5 , so as to be contained in a void 37 between the two housings and both wheels 34, 36 fixed with respect to outer housing 22. Toothed drive belt 38 made from polyurethane passes around wheels 34, 36 and is fed between drive cog 40 and guide wheel 41 pivotally located on housing 22. Attachment 42 is bolted to inner housing 20 and secures to drive belt 38 to permanently fix belt 38 to housing 20.
  • Drive cog 40 is attached to crank handle 26 by way of bearing block 44 and spur gears 46, 48, see Figure 6 and also Figure 2 which shows a cross section through mast 16 when crank handle 26 is in a horizontal position.
  • Spur gear 48 and drive wheel 40 are on a common shaft.
  • FIG 3 shows trolley 31 in detail, with a plan view shown in Figure 3(a) and a side view in Figure 3(b) .
  • Trolley 31 comprises two elongate arms, 50, 52 overlapping centrally to form a cruciform shape. An end of each arm carries an axle bearing a pair of wheels 54. A central threaded aperture 56 receives one end of each gas strut 30, 30', securing the gas struts with respect to each other and with respect to trolley 31.
  • Trolley 31 is configured so that wheels 54 are able to travel along the internal diameter of housing 22 and so guide vertical movement of struts 30, 30', see Figure 4 .
  • Trolley 31 freely rolls up and down the internal face of housing 20 with minimal resistance ensuring gas struts 30, 30' are correctly aligned as mast 16 telescopes upwards or retracts downwards, and prevents struts 30, 30' buckling during downward movement as it enables shorter length more robust gas struts to be used in combination along a common axis to achieve the required maximum extension.
  • trolley 31 can be located near the mid-region of the single strut to provide support and prevent buckling when the gas strut is fully extended.
  • Figures 5 and 7 show the load-lifting device in its unextended position as in Figure 1 where inner housing 20 is fully nested within outer housing 22. If a user desires to raise work platform 18, then they turn handle 26 in a clockwise direction to drive small spur gear 46 which in turn drives larger spur gear 48 connected to drive cog 40. Spur gears 46, 48 reduce the effort needed to turn handle 26 but also reduce travel speed at pulley wheels 34, 36. Drive cog 40 turns in response to movement of gear 48 to move drive belt 38 and due to the permanent attachment of inner housing 20 to a fixed point on belt 38, inner housing 20 moves relative to outer housing 22, outer housing 22 extending vertically upwards, see Figures 8 and 9.
  • Figure 9 shows an embodiment using a single gas strut but generally two gas struts with a supporting trolley will be used to avoid buckling of the single gas strut during downward movement and to reduce production costs.
  • Pressurised gas strut 30 which can be seen in Figure 1 but is omitted in the views of Figures 5 , 7 and 8 for clarity, continually urges against face 29 of outer housing 22, with an upper end of gas strut 30' urging against the base of trolley 31.
  • Gas struts 30, 30' are permanently attempting to extend but can only extend as and when inner housing 20 moves relative to outer housing 22. When the two housings extend, the mass of work platform 18 and any payload it is carrying are partly supported by the force from gas struts 30, 30'. This significantly reduces the amount of force that a user or motor needs to apply to crank handle 26 to move housings 20, 22 relative to each other and to raise platform 18 vertically.
  • crank handle 26 in an anti-clockwise direction to reverse the travel of belt 38, retract the two housings 20, 22, and so lower platform 18.
  • the pulley system can be operated by a powered drive but a manually operated drive can be of use where electricity is not readily available.
  • the gas strut assists raising of the platform requiring less energy to be used either by an operator or by a motor.
  • Equivalent systems of chain drives, wire rope systems can be used to move the housings relative to each other.
  • the slidable housings with internal supporting gas struts can be combined with additional nested housings to provide a longer telescopic mast to which the elevatable work platform 18 is attached.
  • additional tubular sections 60, 62 having successively increased diameters over section 22 are provided to extend the maximum height achievable for platform 18.
  • sections 20, 22 and 60 nest within section 62.
  • Section 62 typically has a sealed end portion 63.
  • Third and fourth mast sections 60, 62 are moveable relative to second mast section 22 by pulley system 64 comprising belt 66 routed through fixed pulley wheel 68 attached to mast section 60 and fixed pulley wheel 70 attached to mast section 22.
  • Belt 66 is secured at one end to end portion 63 of mast section 62, and the other end of belt 66 is secured to rim 71 of section 62.
  • Drive cable fixing 72 acts as a stop defining the fully raised position of sections 60 and 62.
  • gas springs can be located between the third and fourth sections 60, 72 or a plurality of interconnected gas springs can be fitted in the centre of the mast sections, typically with connecting wheeled trolleys 31 between adjacent gas struts.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Transportation (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (12)

  1. Dispositif de levage de charge (10) comprenant une plate-forme (18) fixée à un moyen formant support extensible (16) comprenant un logement interne et un logement externe (20, 22), le logement interne (20) étant emboîtable au sein du logement externe (22), au moins un vérin à gaz (30, 30') étant situé dans le moyen formant support extensible (16) et un moyen d'actionnement (24) étant associé au moyen formant support extensible, le moyen d'actionnement (24) étant exploitable pour permettre l'extension du moyen formant support, caractérisé en ce que le moyen d'actionnement comprend un système de poulie (24), le système de poulie (24) comprenant une boucle d'entraînement (38) située dans le logement externe (22) et fixée de façon permanente au logement interne (20).
  2. Dispositif de levage de charge selon la revendication 1, dans lequel l'au moins un vérin à gaz (30, 30') agit pour presser le moyen formant support extensible (16) dans une position en extension.
  3. Dispositif de levage de charge selon la revendication 1 ou la revendication 2, dans lequel le moyen formant support (16) est extensible verticalement.
  4. Dispositif de levage de charge selon l'une quelconque des revendications précédentes, dans lequel le moyen d'actionnement (24) peut être actionné manuellement.
  5. Dispositif de levage de charge selon l'une quelconque des revendications précédentes, dans lequel les logements interne et externe (20, 22) peuvent coulisser linéairement l'un par rapport à l'autre.
  6. Dispositif de levage de charge selon la revendication 5, dans lequel les logements coulissants (20, 22) sont combinés avec un logement emboîté supplémentaire (60, 62).
  7. Dispositif de levage de charge selon la revendication 6, dans lequel les logements emboîtés supplémentaires (60, 62) présentent des diamètres croissants successivement sur le logement externe (22).
  8. Dispositif de levage de charge selon la revendication 7, dans lequel deux logements emboîtés supplémentaires (60, 62) sont disposés mobiles par rapport au logement externe (22) par un système de poulie (64).
  9. Dispositif de levage de charge selon la revendication 8, dans lequel des ressorts à gaz sont disposés entre les deux logements emboîtés supplémentaires (60, 62).
  10. Dispositif de levage de charge selon l'une quelconque des revendications 1 à 9, dans lequel une partie du mécanisme d'actionnement est fixée de façon permanente sur la plate-forme (18).
  11. Dispositif de levage de charge selon l'une quelconque des revendications précédentes, dans lequel deux vérins à gaz (30, 30') sont situés à l'intérieur du moyen formant support (16), les vérins à gaz étant maintenus en relation fixe l'un par rapport à l'autre pour agir selon un axe commun.
  12. Dispositif de levage de charge selon la revendication 11, dans lequel chaque vérin à gaz s'engage avec un moyen de guidage commun (31) commandant le positionnement des vérins à gaz dans le moyen formant support.
EP13724311.9A 2012-03-20 2013-03-19 Dispositif de levage de charge Active EP2828193B8 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB1204820.3A GB201204820D0 (en) 2012-03-20 2012-03-20 Load lifting device
GBGB1214620.5A GB201214620D0 (en) 2012-03-20 2012-08-16 Load lifting device
PCT/GB2013/050690 WO2013140149A1 (fr) 2012-03-20 2013-03-19 Dispositif de levage de charge

Publications (3)

Publication Number Publication Date
EP2828193A1 EP2828193A1 (fr) 2015-01-28
EP2828193B1 true EP2828193B1 (fr) 2019-05-08
EP2828193B8 EP2828193B8 (fr) 2019-08-21

Family

ID=46052184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13724311.9A Active EP2828193B8 (fr) 2012-03-20 2013-03-19 Dispositif de levage de charge

Country Status (4)

Country Link
EP (1) EP2828193B8 (fr)
ES (1) ES2731878T3 (fr)
GB (3) GB201204820D0 (fr)
WO (1) WO2013140149A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL70840Y1 (pl) * 2017-08-18 2019-06-28 Przed Hak Spolka Z Ograniczona Odpowiedzialnoscia Podest roboczy przejezdny z napędem ręcznym
DE202018105169U1 (de) * 2018-09-10 2019-03-12 Zarges Gmbh Verfahrbarer Personenlift
GB2605937B (en) 2020-10-16 2023-12-20 David Brown Michael Height adjustable platform
EP4015442B1 (fr) 2020-12-16 2023-06-07 Gromet Srl Dispositif pour soulever des charges
EP4206117A1 (fr) 2021-12-28 2023-07-05 Gromet Srl Dispositif pour soulever des charges

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US4427093A (en) * 1980-12-29 1984-01-24 Economy Engineering Company Locking device
US4712653A (en) * 1985-08-14 1987-12-15 Lift-R Technologies, Inc. Energy-recycling scissors lift
SE455990B (sv) * 1986-12-29 1988-08-29 Electrolux Ab Patientlyft
NL8800835A (nl) * 1988-03-31 1989-10-16 Brinkers Gerardus Cornelis Verplaatsbare draag- en hefinrichting voor het ondersteunen van een plateau.
US5803204A (en) * 1995-10-23 1998-09-08 Upright, Inc. Personnel lift with clamshell cage assembly
DE102005019404A1 (de) * 2005-04-25 2006-10-26 Korn, Reinhard, Dipl.-Ing. Sicherheitsplattform mit Gasdruckfeder-Antrieb
DE102007015438A1 (de) * 2007-03-30 2008-10-02 Bayerische Motoren Werke Aktiengesellschaft Verstellanordnung mit einem Scherengestell, insbesondere Federelement
CN103648961B (zh) * 2010-08-17 2016-01-13 Jlg工业公司 使用多级桅杆模块的桅杆升降装置
US8789654B2 (en) * 2010-08-17 2014-07-29 Jlg Industries, Inc. Mast lift with screw drive and gas strut

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
GB2500997B (en) 2016-04-27
WO2013140149A1 (fr) 2013-09-26
GB201204820D0 (en) 2012-05-02
GB201304961D0 (en) 2013-05-01
EP2828193B8 (fr) 2019-08-21
GB201214620D0 (en) 2012-10-03
ES2731878T3 (es) 2019-11-19
EP2828193A1 (fr) 2015-01-28
GB2500997A (en) 2013-10-09

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