WO2012153087A1 - Machine élévatrice - Google Patents

Machine élévatrice Download PDF

Info

Publication number
WO2012153087A1
WO2012153087A1 PCT/GB2012/000419 GB2012000419W WO2012153087A1 WO 2012153087 A1 WO2012153087 A1 WO 2012153087A1 GB 2012000419 W GB2012000419 W GB 2012000419W WO 2012153087 A1 WO2012153087 A1 WO 2012153087A1
Authority
WO
WIPO (PCT)
Prior art keywords
lifting machine
lift mechanism
machine according
lifting
screw
Prior art date
Application number
PCT/GB2012/000419
Other languages
English (en)
Inventor
Roger Bowden
Original Assignee
Niftylift Limited
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 Niftylift Limited filed Critical Niftylift Limited
Publication of WO2012153087A1 publication Critical patent/WO2012153087A1/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
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/025—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars screw operated

Definitions

  • the present invention relates to a lifting machine, for example an elevating work platform or a load handling machine, and to a lift mechanism for a lifting machine.
  • a lifting machine for example an elevating work platform or a load handling machine
  • a lift mechanism for a lifting machine In particular, but not exclusively, the invention relates to a low level elevating work platform.
  • An elevating work platform typically comprises a base, an operator platform and a lift mechanism for adjusting the height of the operator platform relative to the base.
  • the operator platform may be raised allowing an operator to work safely at height without requiring scaffolding, ladders or free-standing steps.
  • elevating work platforms use either a boom lift mechanism or a scissor lift mechanism. These lift mechanisms are particularly suitable for medium or high level elevating work platforms that provide a working height of about 8m up to 20m or more. For low level work platforms providing a working height of up to about 5m, a lift mechanism that is lighter, simpler and easier to maintain may be more suitable.
  • a lifting machine comprising a base, a lifting structure and a lift mechanism for adjusting the height of the lifting structure relative to the base, said lift mechanism including a drive device and a screw element arranged to be driven by the drive device, wherein rotation of the screw element is configured to adjust the height of the lifting structure relative to the base.
  • the drive mechanism is also simple, inexpensive and easy to maintain, and can be packaged within a small enclosure.
  • the drive mechanism is also light in weight making it particularly suitable for low level lifting machines.
  • the lift mechanism is constructed and arranged such that in use the screw element carries a tensile load. This avoids a problem associated with using a screw element that carries a compressive load, which can buckle if subjected to an excessive load.
  • the screw element and its mountings may therefore be lighter and less expensive.
  • the screw element may alternatively be constructed and arranged to carry a compressive load.
  • the lift mechanism includes a screw follower that is arranged to travel along the screw element in response to rotation thereof, said screw follower being connected to the lifting structure to adjust the height thereof.
  • the screw follower is preferably connected to the lifting structure by at least one flexible elongate drive element, for example a chain, rope or belt.
  • the flexible elongate drive element may include a first part attached to the screw follower, a second part connected directly or indirectly to the lifting structure, and an intermediate part that passes around a guide element.
  • the guide element may for example consist of a sprocket, a pulley or a wheel.
  • the guide element is preferably mounted towards an upper end of a tower structure.
  • a lifting machine comprising a base, a lifting structure and a lift mechanism for adjusting the height of the lifting structure relative to the base, said lift mechanism including a drive device, a screw element arranged to be driven by the drive device, a screw follower configured to travel along the screw element in response to rotation thereof, and at least one flexible elongate drive element having a first part attached to the screw follower, a second part connected directly or indirectly to the lifting structure, and an intermediate part that passes around a guide element, said guide element being mounted towards an upper end of a tower structure, the lift mechanism being configured such that rotation of the screw element adjusts the height of the lifting structure relative to the base.
  • the screw element extends substantially vertically within the tower structure.
  • the tower structure preferably includes a first tower section and a telescopically adjustable second tower section that is connected to the first tower section for telescopic extension relative thereto. This increases the operational height range of the lifting structure without increasing the length of the tower structure.
  • the lift mechanism preferably includes first and second flexible elongate drive elements, wherein the first flexible elongate drive element has a first part connected to the screw follower, a second part connected to the second tower section and an intermediate part that passes around a guide element mounted towards an upper end of the first tower section, and wherein the second flexible elongate drive element has a first part connected to the first tower section, a second part connected directly or indirectly to the lifting structure and an intermediate part that passes around a guide element mounted towards an upper end of the second tower section.
  • the base is mounted on wheels or tracks for movement across a floor surface.
  • it may be mounted on feet or skids for a static machine.
  • the drive device is an electric motor, for example an AC motor or a brushless DC motor.
  • the electric motor is preferably powered from leak-proof batteries, for example sealed lead-acid batteries, such as Gel or Absorbed Glass Mat
  • S-P552548 110512 08/20172012 batteries may be powered by mains electricity.
  • the drive device could use air power.
  • the electric motor is preferably a regenerative motor, allowing it to recover and store electrical energy when the operator platform descends from an elevated position.
  • the drive device may be a manual drive device, for example a crank handle or pedals.
  • the lift mechanism includes a brake that is operative to prevent rotation of the drive device and/or the screw, so as to lock the lifting structure in the chosen operating position.
  • the brake can be disengaged using a manual over-ride, allowing the lift structure to descend under the force of gravity.
  • the lift mechanism could be configured to descend under power.
  • the lift mechanism comprises an elevating work platform having a base, an operator platform and a lift mechanism for adjusting the height of the operator platform relative to the base.
  • the maximum range of height adjustment is in the range 1m to 8m, preferably 2m to 5m.
  • a lift mechanism for lifting machine comprising a base, a lifting structure and a lift mechanism for adjusting the height of the lifting structure relative to the base, said lift mechanism including a drive device and a screw element arranged to be driven by the drive device, the lift mechanism being configured such that rotation of the screw element adjusts the height of the lifting structure relative to the base.
  • Figure 1 is an isometric view of a mobile elevating work platform showing the rear and right sides;
  • Figure 2 is an isometric view of the mobile elevating work platform showing the front and right sides;
  • Figure 3 is a top plan view of the mobile elevating work platform;
  • Figure 4 is a right side view of the mobile elevating work platform;
  • Figure 5 is a front view of the mobile elevating work platform;
  • Figure 6 is an isometric view, showing internal components of a lift mechanism of the mobile elevating work platform
  • Figure 7 is a side view of the lift mechanism in a fully lowered position
  • Figure 8 is a side view of the lift mechanism in a partially raised position.
  • the elevating work platform 2 includes a base (or chassis) 4, a lifting structure in the form of an operator cage 6 and a lift mechanism 8 that is operable to adjust the height of the operator platform 6 relative to the base 4.
  • the base 4 is mounted on two pairs of wheels 10a, 10b, the first pair of wheels 10a being fixed wheels and the second pair of wheels 10b being pivoting casters.
  • Locking brakes 12 may be provided on some or all of the wheels to lock the wheels during lifting operations.
  • the wheels are not driven as the work platform is light enough to be pushed manually into a desired location.
  • powered wheels or tracks may be provided, or the wheels may be replaced by feet or skids if mobility is not important.
  • the platform may be moved using for example a pallet truck, trolley jack or a forklift truck.
  • the operator platform 6 includes a floor plate 14 with a peripheral wall 16 and a safety cage 18.
  • a control console (not shown) for controlling operation of the elevating work platform may be mounted on the safety cage 18 and/or elsewhere on the elevating work platform.
  • the lift mechanism 8 which is shown in detail in Figure 6, includes a tower structure 14 comprising a fixed first tower section 16 and a telescopically adjustable second tower section 18, which is connected to the first tower section 16 for telescopic extension relative thereto.
  • the first tower section 16 is mounted substantially vertically on the base 4 and is supported by a pair of braces 22.
  • the second tower section can be adjusted substantially vertically relative to the first tower section.
  • a support arm 24 is mounted on the second tower section 18, for example by means of a roller and track mechanism, to allow for vertical adjustment of the arm 24 relative to the second tower section 18.
  • the arm 24 extends beneath and supports the operator platform 6.
  • a screw follower 32 is mounted in engagement with the thread of the lead screw 30 for vertical movement along the screw as it rotates.
  • the screw follower 32 comprises a nut 34 that is attached to or formed with a plate 36.
  • a ball screw or roller screw mechanism may be used.
  • the plate 36 extends transversely on either side of the lead screw 30 and is captured between an adjacent face of the first tower section 16 and a housing 38 attached to the first tower section 16 (the housing 38 has been omitted in Figure 6 to reveal the internal components of the tower structure).
  • the housing 38 and the first tower section 16 together prevent rotation of the screw follower 32, thereby ensuring that the rotation of the lead screw 30 drives the screw follower 32 along the lead screw 30.
  • a brake 40 is attached to the lower end of the motor 26.
  • the brake 40 can be actuated to prevent rotation of the motor 26 and the lead screw 30.
  • a pair of flexible elongate drive elements 42 are connected to the screw follower 32 and extend upwards towards the upper end of the first tower section 16, where they pass around guide elements 44.
  • the drive elements 42 are chains and the guide elements 44 are sprockets mounted at the upper end of the first tower section 16.
  • the drive elements 42 may be wire ropes or belts and the guide elements 44 may be wheels or pulleys.
  • the flexible drive elements 42 extend downwards through the first tower section 16 and are attached at their lower ends to the telescopically adjustable second tower section 18.
  • the mechanism is configured so that when the lead screw 30 rotates in a first direction to draw the screw follower 32 downwards, the flexible drive elements 42 draw the second tower section 18 upwards. This is illustrated in Figures 7 and 8, where in Figure 7 the second tower section 18 is shown in a lowered position and in Figure 8 it is shown in a partially raised position. When the lead screw 30 rotates in an opposite second direction, the second tower section 18 is returned to the lowered position shown in Figure 7.
  • a second set of flexible elongate drive elements 46 is provided to drive movement of the support arm 24 relative to the second tower structure 18.
  • the second drive elements 46 are attached at their first ends to a bracket 48 at the upper end of the first tower section 16 and extend upwards towards the upper end of the second tower section 18, where they pass around second guide elements 50.
  • the second drive elements 46 then extend downwards through the second tower section 18 and are attached at their second ends to the support arm 24.
  • the second drive elements 46 may consist of chains, ropes or belts and the second guide elements 50 may be sprockets, pulleys or wheels as appropriate.
  • a third flexible drive element 52 is provided on an external side of the tower structure 14.
  • the third drive element 52 is connected at one end to the first tower section 16 and extends downwards and around a guide element 54 mounted towards the lower end of the second tower section 18.
  • the second end of the third flexible drive element 52 is connected to the support arm 24.
  • the third drive element 30 may be a chain, rope or belt as required. In use, the third drive element ensures that when the second tower section 18 is lowered relative to the first tower section 16, the support arm 24 is simultaneously returned to its lowered position.
  • Operation of the elevating work platform is as follows. To ascend, the motor brake 40 is disengaged and the motor 26 is actuated. This causes the lead screw 30 to rotate, thus drawing the screw follower 32 downwards. The first and second flexible drive elements 42,46 transfer this motion to the second tower section 18 and to the support arm 24, causing the second tower section 18 to extend telescopically relative to the first tower S-P552548 110512 08/01/2012 section 16 and simultaneously raising the support arm 24 relative to the second tower section. The operator cage 6 is thus lifted to the desired height. The motor brake 40 is then actuated to hold the cage at that height.
  • the motor brake 40 is disengaged, allowing the operator cage 6 to descend under the force of gravity.
  • the lead screw 30 rotates, driven by the screw follower 32. Rotation of the lead screw 30 causes corresponding rotation of the motor 26 and, if desired, the motor can be used to regenerate electric energy, which is stored in storage batteries (not shown).
  • the brake 40 is actuated to hold the cage in that position.
  • the elevating work platform illustrated in the drawings is designed to provide a working height of approximately 5 metres. If a greater working height is required, the height of the tower structure 8 may be increased or one or more additional telescoping tower sections may be provided. If a reduced working height is needed, the telescopically extending second tower section 18 may be omitted. In this case, the first flexible drive elements will be attached at their second ends to the support arm 24.
  • the lift mechanism 8 comprising tower structure 14, the support arm, the motor 26, the lead screw 30, the screw follower 32 and the flexible elongate drive elements 42, 46 may also be provided separately for fitting to an alternative fixed or movable base unit.
  • the lifting machine may take the form of a load handling machine instead of an elevating work platform.
  • the lifting structure will consist of a load lifting device, for example a fork lift structure, replacing the operator cage.
  • the motor may be replaced by a manual drive device, for example a crank handle, a winch or pedals, which may be connected to the screw element via a one-way clutch or ratchet to prevent reverse rotation of the manual drive device as the platform descends.
  • a releasable ratchet may also be provided to prevent unintended descent of the lift mechanism.
  • the screw element may alternatively be constructed to operate in compression, so that it pushes the screw follower upwards rather than pulling it downwards. In this case a larger, more rigid screw element may be required to resist buckling forces.

Landscapes

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

Abstract

L'invention porte sur une machine élévatrice, par exemple une plateforme de travail élévatrice, qui comprend une base (4), une plateforme d'opérateur (6) et un mécanisme élévateur (8) destiné à régler la hauteur de la plateforme d'opérateur par rapport à la base. Le mécanisme élévateur (8) comprend un moteur (26) et une vis (30) qui est agencée pour être entraînée par le moteur. La rotation de la vis (30) règle la hauteur de la plateforme d'opérateur (6) par rapport à la base (4). Le mécanisme élévateur (8) comprend en outre, de préférence, des sections de tour télescopiques (16, 18) et des éléments de transmission allongés flexibles (42, 46) servant à transmettre la force motrice à la plateforme d'opérateur (6).
PCT/GB2012/000419 2011-05-12 2012-05-09 Machine élévatrice WO2012153087A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1107999.3 2011-05-12
GB201107999A GB2493487A (en) 2011-05-12 2011-05-12 Lifting Machine

Publications (1)

Publication Number Publication Date
WO2012153087A1 true WO2012153087A1 (fr) 2012-11-15

Family

ID=44260460

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2012/000419 WO2012153087A1 (fr) 2011-05-12 2012-05-09 Machine élévatrice

Country Status (2)

Country Link
GB (1) GB2493487A (fr)
WO (1) WO2012153087A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104150391A (zh) * 2014-08-28 2014-11-19 苏州美罗升降机械有限公司 一种提升作业一体式升降机
CN110316683A (zh) * 2019-07-18 2019-10-11 佛山科学技术学院 一种升降平台
CN112744760A (zh) * 2021-01-22 2021-05-04 方培校 一种用于园林绿化用小型升降平台

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106276726A (zh) * 2016-08-24 2017-01-04 合肥超赢工业设计有限公司 一种带有升降功能的电力维修梯
US10723607B2 (en) 2017-03-24 2020-07-28 Big Lift, Llc Electric personnel lift device
US10160629B2 (en) 2017-03-24 2018-12-25 Big Lift, Llc Electric personnel lift device
USD894519S1 (en) 2018-03-23 2020-08-25 Big Lift, Llc Personnel lift vehicle
USD891724S1 (en) 2018-03-23 2020-07-28 Zhejiang E-P Equipment Co., Ltd. Personnel lift vehicle
CN113277442B (zh) * 2021-06-11 2022-04-22 江苏汇智高端工程机械创新中心有限公司 一种全电动高空作业平台能量回收控制方法及系统

Citations (5)

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Publication number Priority date Publication date Assignee Title
BE511727A (fr) *
FR2319572A1 (fr) * 1975-08-01 1977-02-25 Monte-charge pour garage
US4427094A (en) * 1981-07-10 1984-01-24 Winkelblech Dean R Portable elevator device
EP0424344A1 (fr) * 1989-10-17 1991-04-24 Arjo Hospital Equipment Ab Appareil élévateur, notamment pour soulever les malades
US5368130A (en) * 1993-11-15 1994-11-29 Savage Bros. Co. Lift truck

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GB2080246A (en) * 1980-07-24 1982-02-03 Dickens Charles & Sons Ltd Lifting apparatus
US5036951A (en) * 1990-06-04 1991-08-06 Frangos John W Elevator-type storage system
AUPN141995A0 (en) * 1995-02-28 1995-03-23 Endurequip Pty Ltd Column hoists
US5848668A (en) * 1995-11-08 1998-12-15 Ez Life Products, Inc. Portable lifting system for easy movement of moderately heavy items
GB9721269D0 (en) * 1997-10-06 1997-12-10 Hobbs Michael An adjustable support apparatus
FR2781779B1 (fr) * 1998-07-30 2000-10-13 Richard Becher Elevateur de charge notamment de vehicule

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE511727A (fr) *
FR2319572A1 (fr) * 1975-08-01 1977-02-25 Monte-charge pour garage
US4427094A (en) * 1981-07-10 1984-01-24 Winkelblech Dean R Portable elevator device
EP0424344A1 (fr) * 1989-10-17 1991-04-24 Arjo Hospital Equipment Ab Appareil élévateur, notamment pour soulever les malades
US5368130A (en) * 1993-11-15 1994-11-29 Savage Bros. Co. Lift truck

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104150391A (zh) * 2014-08-28 2014-11-19 苏州美罗升降机械有限公司 一种提升作业一体式升降机
CN104150391B (zh) * 2014-08-28 2016-11-23 苏州美罗升降机械有限公司 一种提升作业一体式升降机
CN110316683A (zh) * 2019-07-18 2019-10-11 佛山科学技术学院 一种升降平台
CN112744760A (zh) * 2021-01-22 2021-05-04 方培校 一种用于园林绿化用小型升降平台

Also Published As

Publication number Publication date
GB201107999D0 (en) 2011-06-29
GB2493487A (en) 2013-02-13

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