EP0037811A1 - Vertically movable platform. - Google Patents

Vertically movable platform.

Info

Publication number
EP0037811A1
EP0037811A1 EP80901422A EP80901422A EP0037811A1 EP 0037811 A1 EP0037811 A1 EP 0037811A1 EP 80901422 A EP80901422 A EP 80901422A EP 80901422 A EP80901422 A EP 80901422A EP 0037811 A1 EP0037811 A1 EP 0037811A1
Authority
EP
European Patent Office
Prior art keywords
platform
carrier means
lifting
support
carrying
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.)
Granted
Application number
EP80901422A
Other languages
German (de)
French (fr)
Other versions
EP0037811B1 (en
Inventor
Georg Rickardsson
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.)
RICKARDSSON, GEORG
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 EP0037811A1 publication Critical patent/EP0037811A1/en
Application granted granted Critical
Publication of EP0037811B1 publication Critical patent/EP0037811B1/en
Expired legal-status Critical Current

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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/127—Working platforms

Definitions

  • the present invention relates to work platforms, used for example in the building industry, or for installation and repair work, e.g. in water or electrical services or in erection work with large machines.
  • Work platforms of this type have been made with a supporting structure incorporating a system of arms, either * in the form of a parallelogram linkage sytem or as scissors.
  • the work platform is movable along a vertical mast or guide means, attached to a basic frame.
  • the vertical movement of the work platform is provided by machinery, most often electrically driven.
  • the present invention has the object of providing a very simple and cheap work platform, primarily intended for erection, installation and repair work and for being put to use in small building jobs.
  • This object is achieved in a very simple manner by forming the work platform to coact with a anoeuverable lifting machine and to have a platform which is movable vertically.
  • the platform At its first end the platform has a vertical support with guide means adapted for guiding vertical movement at this end, and has at its second end support an'd carrier means for coaction with machine-driven, vertically movable lifting means on the lifting machine, e.g. the tynes of a fork-lift trucko
  • a lifting means for the platform comprises two carrier means, which are variable as to their lengths, the first carrier means carrying the first end of the platform and being arranged between the latter and the top of the guide means, while the second carrier means is arranged between the second end of the platform and an attachment arranged under the lowest position of the platform, this attachment being mounted on the lifting machine carrying the movable lifti,
  • OMPI means means.
  • the carrier means are so connected to each other that for platform movement the second means is shortened just as much as the first means is extended, the platform being parallel-displaced upwards. For the opposite variation in length of the carrier means, the platform is moved downwards.
  • the entire work platform with supports is designated by the numeral 10 in the figure, while 11 designates a fork-lif truck.
  • the work platform comprises a platform 20, a vertical support means 30 along which the platform 20 is vertically movable, and a lifting or operating means 40 for raising and lowering the platform 20.
  • the platform 20 comprises a longitudinal beam structure 21, a walkway 22 and surrounding ..railing 23, comprising post and horizontal handrails.
  • the platform 20 At its first end, to the left in the drawing, the platform 20 is carried by a vertical suppor means 30, described in more detail below.
  • the platform i-s carried by the tynes 12 on the fork-lift truck 11.
  • the tynes 12 can be inserted in tubes or channels 27 and be locked thereto, e.g. with the aid of through-holes and bolts or clamping means.
  • a beam 27 is arranged for each tyne on the fork-lift truck 11 and the beams are connected together into a framed structure.
  • Said structure has brackets 26 carrying a shaft 25, which also coacts with brackets 24 on the frame 21 of th platform 20 at its second or right end.
  • the platform 20 and the truck 11 are thus articulated in relation to each other about the shaft 25 0 When the work platform is not in use, it rests on the ground via the support means 30 and the beams 27
  • the support means 30, carrying the first or left end of the platform 20, comprises one or more vertical tubes or beams 31, which can slide in guides 28 on the platform.20.
  • the beam or beams 31 are preferably unrotatably connected to the platform 20, but are disposed for movement substantially at right angles to the platform.
  • the support 31 has at its upper end a carrier structure 32 for a rotatable pulley 45, which is part of the operating means 40.
  • At its lower end the support 31 is provided with a castor wheel or wheels 33, pivotable about vertical shaft stubs 34.
  • a cable is denoted by the numeral 41, one end portion 41' of which is fixed to an attachment 42 on the downward, front end part of the fork-lift truck.
  • the cable portion 41" is taken upwards and round a rotatable cable pulley 43, which is arranged on the shaft 25 or in the vicinity thereof. From the cable pulley 43, the cable 41 extends along the platform 20 to the first or left end thereof, and to a rotatable cable pulley 44, which is mounted on the under side of the platform 20.
  • the cable.41 is taken with a substantially, vertical portion 41" over a rotatable cable pulley 45 mounted on the upper end of the support 31 and thereafter downwards outside the platform 20 and outside the support 31 to an attachment point 46 on said support.
  • the attachment point 46 is arranged at one end of a turnbuckle 47, the other end of which having anattachment point 48 rigidly connected to the lowest portion - 0 f the support 31.
  • the platform 20 is moved upwards and downwards by raising or lowering the- tynes 12 of the fork-lift truck 11.
  • the second end of the platform 20 is raised via the framed structure with the parts 25-27, carried by the tynes 12 of the fork-lift truck 11.
  • the coacting structure 24 on the platform 20 is also lifted by the intermediary of the shaft 25.
  • the portion 41* of the cable 40 will r be extended by the cable 41 under the platform being pulled out to the right or second end of said platform. This movement signifies that a corresponding length of the cable is taken away from the cable portion 41", which thus becomes shorter. It will be noted that the extension of the cable portion 41* to the shortening of the cable portion 41".
  • the turnbuckle 47 is rotated so that the attach ment point 46 is moved downwards.
  • the cable portion 41" wil thus be pulled upwards round the pulley 45 and be shortened thereby lifting the first or left end of the platform so th the latter can be adjusted with the same height at both end If, instead, the first or left end of the platform 20 is higher than the second end, the turnbuckle 47 is rotated so that the cable pulley 44 and thereby the first or left end the platform 20 is lowered to the desired position.
  • An adjustment of the horizontal attitude of the platform in th way described results, for example, in that the platform 20 can be brought to a horizontal attitude and subsequently be moved upwards and downwards without this attitude being altered even if the substructure is such that the castor wheel or wheels 33 are somewhat lower or higher than their normal position in relation to the wheels on the fork-lift truck 11.

Abstract

Une plateforme de travail pouvant monter et descendre agit en association avec une machine de levage (11). Une plateforme mobile verticalement (20) possede a une extremite un support vertical (30) avec des moyens de guidage (28, 31) pour porter et guider le mouvement vertical de ladite extremite, et a son autre extremite des moyens de support et porteurs (27) agissant en cooperation avec des moyens de levage mobiles verticalement entraines mecaniquement, p.ex. les fourches (12) d'un elevateur a fourche (11). La plateforme est elevee et abaissee par un dispositif de levage (40) avec deux moyens porteurs variables en longueur. Le premier moyen porteur (41'') porte ladite extremite (44) de la plateforme de travail (10) et il est dispose entre ladite extremite (44) et la partie superieure (32) de la structure de support (30). Le second moyen porteur (41') est dispose entre l'autre extremite (24, 43) de la plateforme et une fixation (42), sous la position la plus basse de la plateforme (20), et il est fixe a la machine de levage (11) portant les moyens de levage mobiles (12). Les moyens porteurs (41', 41'') sont relies entre eux de telle maniere que, en vue du mouvement de la plateforme (20), le second moyen porteur (41'') est raccourci autant que le premier moyen porteur (41') est allonge, assurant ainsi le deplacement parallele vers le haut de la plateforme (20), et en faisant varier inversement les longueurs des moyens porteurs (41', 41''), la plateforme (20) est deplacee vers le bas. Les variations de longueur du second moyen porteur (41') sont obtenus grace aux moyens de levage (12) de la machine de levage (11).An up and down work platform acts in conjunction with a lifting machine (11). A vertically movable platform (20) has at one end a vertical support (30) with guide means (28, 31) for carrying and guiding the vertical movement of said end, and at its other end support and carrier means ( 27) acting in cooperation with mechanically driven vertically movable lifting means, eg the forks (12) of a forklift (11). The platform is raised and lowered by a lifting device (40) with two supporting means variable in length. The first carrier means (41 '') carries said end (44) of the work platform (10) and is disposed between said end (44) and the upper part (32) of the support structure (30). The second carrier means (41 ') is placed between the other end (24, 43) of the platform and a fixing (42), under the lowest position of the platform (20), and it is fixed to the machine lifting device (11) carrying the mobile lifting means (12). The carrying means (41 ', 41' ') are interconnected in such a way that, in view of the movement of the platform (20), the second carrying means (41' ') is shortened as much as the first carrying means (41 ') is lengthened, thus ensuring the parallel movement upwards of the platform (20), and by inversely varying the lengths of the carrying means (41', 41 ''), the platform (20) is moved downwards. The variations in length of the second carrier means (41 ') are obtained thanks to the lifting means (12) of the lifting machine (11).

Description

Vertically movable platform
The present invention relates to work platforms, used for example in the building industry, or for installation and repair work, e.g. in water or electrical services or in erection work with large machines.
Work platforms of this type have been made with a supporting structure incorporating a system of arms, either* in the form of a parallelogram linkage sytem or as scissors. In other embodiments, the work platform is movable along a vertical mast or guide means, attached to a basic frame.
The vertical movement of the work platform is provided by machinery, most often electrically driven.
Vertically movable platforms of these known types are often large and heavy, and thereby difficult to handle for- minor jobs. They are also so expensive that they can hardly be used for such worko
The present invention has the object of providing a very simple and cheap work platform, primarily intended for erection, installation and repair work and for being put to use in small building jobs. This object is achieved in a very simple manner by forming the work platform to coact with a anoeuverable lifting machine and to have a platform which is movable vertically. At its first end the platform has a vertical support with guide means adapted for guiding vertical movement at this end, and has at its second end support an'd carrier means for coaction with machine-driven, vertically movable lifting means on the lifting machine, e.g. the tynes of a fork-lift trucko
A lifting means for the platform comprises two carrier means, which are variable as to their lengths, the first carrier means carrying the first end of the platform and being arranged between the latter and the top of the guide means, while the second carrier means is arranged between the second end of the platform and an attachment arranged under the lowest position of the platform, this attachment being mounted on the lifting machine carrying the movable lifti,
OMPI means. The carrier means are so connected to each other that for platform movement the second means is shortened just as much as the first means is extended, the platform being parallel-displaced upwards. For the opposite variation in length of the carrier means, the platform is moved downwards The invention will now be described in more detail whil referring to the appended drawing, showing a work platform i coaction with a fork-lift truck.
The entire work platform with supports is designated by the numeral 10 in the figure, while 11 designates a fork-lif truck. The work platform comprises a platform 20, a vertical support means 30 along which the platform 20 is vertically movable, and a lifting or operating means 40 for raising and lowering the platform 20. The platform 20 comprises a longitudinal beam structure 21, a walkway 22 and surrounding ..railing 23, comprising post and horizontal handrails. At its first end, to the left in the drawing, the platform 20 is carried by a vertical suppor means 30, described in more detail below. At its second end, to the right in the drawing, the platform i-s carried by the tynes 12 on the fork-lift truck 11. The tynes 12 can be inserted in tubes or channels 27 and be locked thereto, e.g. with the aid of through-holes and bolts or clamping means. A beam 27 is arranged for each tyne on the fork-lift truck 11 and the beams are connected together into a framed structure. Said structure has brackets 26 carrying a shaft 25, which also coacts with brackets 24 on the frame 21 of th platform 20 at its second or right end. The platform 20 and the truck 11 are thus articulated in relation to each other about the shaft 250 When the work platform is not in use, it rests on the ground via the support means 30 and the beams 27
The support means 30, carrying the first or left end of the platform 20, comprises one or more vertical tubes or beams 31, which can slide in guides 28 on the platform.20. The beam or beams 31 are preferably unrotatably connected to the platform 20, but are disposed for movement substantially at right angles to the platform. The support 31 has at its upper end a carrier structure 32 for a rotatable pulley 45, which is part of the operating means 40. At its lower end the support 31 is provided with a castor wheel or wheels 33, pivotable about vertical shaft stubs 34. By means of this arrangement, the work platform can be driven and manoeuvered by the truck in desired directions.
Operation of- the platform 20 vertically is done by means of an apparatus primarily comprising traction means such as one or more cables and cable pulleys. In the figure, a cable is denoted by the numeral 41, one end portion 41' of which is fixed to an attachment 42 on the downward, front end part of the fork-lift truck. The cable portion 41" is taken upwards and round a rotatable cable pulley 43, which is arranged on the shaft 25 or in the vicinity thereof. From the cable pulley 43, the cable 41 extends along the platform 20 to the first or left end thereof, and to a rotatable cable pulley 44, which is mounted on the under side of the platform 20. From the cable pulley 44, the cable.41 is taken with a substantially, vertical portion 41" over a rotatable cable pulley 45 mounted on the upper end of the support 31 and thereafter downwards outside the platform 20 and outside the support 31 to an attachment point 46 on said support. In the embodiment illustrated, the attachment point 46 is arranged at one end of a turnbuckle 47, the other end of which having anattachment point 48 rigidly connected to the lowest portion -0f the support 31.
The platform 20 is moved upwards and downwards by raising or lowering the- tynes 12 of the fork-lift truck 11. When the tynes are raised, the second end of the platform 20 is raised via the framed structure with the parts 25-27, carried by the tynes 12 of the fork-lift truck 11. The coacting structure 24 on the platform 20 is also lifted by the intermediary of the shaft 25. When the platform 20 is raised, the portion 41* of the cable 40 willrbe extended by the cable 41 under the platform being pulled out to the right or second end of said platform. This movement signifies that a corresponding length of the cable is taken away from the cable portion 41", which thus becomes shorter. It will be noted that the extension of the cable portion 41* to the shortening of the cable portion 41". This signifies that the first or left end of the platform 20 maintains an unaltered height in relation to the second end of the platform, and that the platform is thus displaced parallel upwards. When the "tynes 12 of the fork-lift truck are lowered, the cable portion 41 * is shortened and the portion 41" is extended, and the platform 20 is displaced parallel downwards in an analogous manner. With the aid of the described arrangement, the lifting machinery of the fork-li truck is thus utilized for raising and lowering the work platform, which thus does not need its own driving machiner As described above, the cable 41" runs over a rotatabl cable pulley 45 and down to a turnbuckle 47. This arrangeme constitutes a device by means of which the horizontal attitude of the platform 20 can be adjusted. For example, i the firs-t or left end of the platform is lower than the second end, the turnbuckle 47 is rotated so that the attach ment point 46 is moved downwards. The cable portion 41" wil thus be pulled upwards round the pulley 45 and be shortened thereby lifting the first or left end of the platform so th the latter can be adjusted with the same height at both end If, instead, the first or left end of the platform 20 is higher than the second end, the turnbuckle 47 is rotated so that the cable pulley 44 and thereby the first or left end the platform 20 is lowered to the desired position. An adjustment of the horizontal attitude of the platform in th way described results, for example, in that the platform 20 can be brought to a horizontal attitude and subsequently be moved upwards and downwards without this attitude being altered even if the substructure is such that the castor wheel or wheels 33 are somewhat lower or higher than their normal position in relation to the wheels on the fork-lift truck 11.
One embodiment of the invention has been described above, but anyone' skilled in the art can naturally easily provide other embodiments within the scope of the appended patent claims. For example, a hydrostatic system can be use instead of the described lifting or operating arrangem and the adjustment means 46-48 can be built up from elements other than a turnbuckle, to mention just a few examples.

Claims

(received by the International Bureau on 12 December 1980 (12.12.80))
1. An arrangement in a mobile lifting device, vertically movable work or load platform (10) lacking its own power source, and being connectible to a manoeuverable lifting machine, e.g. a fork-lift truck, the arrangement including a vertically movable platform (20)-, characterized in that the work platform . (10) is mobile that the platform (20) at its first end has a guide means (28, 31) for displacement of a vertical support structure (30), being arranged for guiding the vertical movement of said end; that the platform (20) has at its second end support and carrier means (27) for coaction with machine-driven, vertically movable lifting means of the lifting machine, e.g. the tynes (12) of a fork-lift truck (11); that the means (40) carrying the platform (20) comprises two carrier means, variable as to their lengths, the first carrier means (41") carrying the first end (44) of the work platform (10) and being disposed between this end (44) and the top (32) of the support structure (30) , while the second carrier means (41") is disposed between the second end (24, 43) of the platform and an attachment (42) disposed under the lowest position of the platform (20) and fixed to the lifting machine (11) carrying the movable lifting means (12), the carrier means (41", 41") being so connected to each other that for movement of the platform (20) the second carrier means (41") is shortened just as much as the first carrier means
(41") is extended, the platform (20) being displaced parallel upwards, and with the opposite length alteration of the carrier means (41", 41") the platform is moved downwards; and that the alterations in length of the second carrier means (41") are achieved by the machinery for the lifting means (12) of the lifting machine (11).
2. A platform as claimed in claim 1, characterized in that the support and carrier means (27) are formed as tubes or channels, adapted.for accommodating the tynes (12) of a fork-lift truck (11).
3. A platform as claimed in claim 2, characterized in tha the support and carrier means (27) have a releasable fastening means for the tynes (12) .
4. A platform as claimed in one or more of the preceding claims, characterized in that the support and carrier means (27) are joined to the platform (20) by means of an articulation (24,25,26). comprising a horizontal shaft (25) extending at right angles to the longitudinal direction of the platform (20).
5. A platform as claimed in claim 1, characterized in tha the carrier means comprise cables, chains or the like elements, the attachment (42). of the second carrier means (411) being disposed at the lowest part of the guide struct carrying and guiding the tynes (12) of the fork-lift truck (11).
6. A platform as claimed in claim 1, characterized in th the carrier means comprise cables, chains or the like elements, the first carrier means (41") extending over a rotatable pulley (45) mounted on the upper part of the support structure (30) and subsequently downwards to an attachment point (48) on the support (31).
7o A platform as claimed in claim 6, characterized in tha a means with variable length (47), e.g. a turnbuckle, is disposed between the end of the first carrier means (41") and the attachment point (48) for the purpose of varying th length of the first carrier means (41") between the first e (44) of the platform (20) and the upper part (32) of the support structure (30) 0
8. A platform as claimed in one or more of the preceding claims, characterized in that the support structure (30) is carried at its lower end by at least one castor wheel {33 ) swivelable about a vertical stub shaft (34) 0
9. A platform as claimed in claim 1, characterized in that the second carrier means comprises a second hydraulic cylinder disposed between the support and carrier means (27) of the second end of the platform (20) and the attachment (42) on the lifting machine, while the first carrier means comprises a first hydraulic cylinder disposed between the first end of the platform and the top (32) of the support structure (30) , 'the cylinders being in mutual communication * via pipes.
10. A platform as claimed in claim 9, characterized in that an adjustment-means is arranged for the supply-or discharge of hydraulic liquid from the communication pipes of the cylinders with the object of making the work platform (10) horizontalo
EP80901422A 1979-07-09 1981-01-26 Vertically movable platform Expired EP0037811B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7905980 1979-07-09
SE7905980A SE417309B (en) 1979-07-09 1979-07-09 VERTICAL MOVABLE WORKPLATFORM

Publications (2)

Publication Number Publication Date
EP0037811A1 true EP0037811A1 (en) 1981-10-21
EP0037811B1 EP0037811B1 (en) 1984-01-25

Family

ID=20338482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80901422A Expired EP0037811B1 (en) 1979-07-09 1981-01-26 Vertically movable platform

Country Status (9)

Country Link
EP (1) EP0037811B1 (en)
JP (1) JPH0138756B2 (en)
BR (1) BR8008973A (en)
DE (1) DE3049687T1 (en)
GB (1) GB2075469B (en)
NO (1) NO148221C (en)
SE (1) SE417309B (en)
SU (1) SU1111683A3 (en)
WO (1) WO1981000097A1 (en)

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CA1311403C (en) * 1989-03-17 1992-12-15 John Marcinkowski Method and apparatus for removing sludge from a spray booth
DE68927863D1 (en) * 1989-07-12 1997-04-17 Kyokuto Kaihatsu Kogyo Co LOADING OR UNLOADING A CONTAINER ON A OR FROM A VEHICLE
US5203670A (en) * 1989-07-12 1993-04-20 Kyokuto Kaihatsu Kogyo Co., Ltd. Container carrier
FR2778193B1 (en) * 1998-05-04 2000-09-08 Mediaco PROTECTIVE TRANSPORT GATEWAYS DEVICE MOUNTED ON A LIFTING APPARATUS
FR2926799B1 (en) * 2008-01-29 2010-05-07 Eric Bonamy TWO-STAGE SEMI-TRAILER TROLLEY FOR HANDLING LONG LOADS
CN102234089B (en) * 2011-03-29 2013-01-02 浙江鼎力机械有限公司 High-altitude operation platform having bidirectional extension operation platform
CN102219170B (en) * 2011-03-29 2012-11-28 浙江鼎力机械有限公司 Two-way extending work platform for aerial work platform
CN104843605B (en) * 2014-02-18 2017-10-10 杨明婷 Multiple proportions wheel chain end ratio folding and unfolding hoistable platform
CN106276723B (en) * 2015-05-28 2019-03-22 北京卫星环境工程研究所 High-altitude for spacecraft, which is visited, stretches job platform
CN108202655A (en) * 2016-12-20 2018-06-26 天津绪阳本华科技有限公司 A kind of electrical equipment fault tool car
CN107642670A (en) * 2017-10-04 2018-01-30 嘉兴新博信息科技有限公司 A kind of eminence electrical equipment observation device
CN114506792B (en) * 2022-01-06 2023-08-18 武汉船用机械有限责任公司 Ore lifting system

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FR1475904A (en) * 1966-02-23 1967-04-07 Tecalemit Improvements to vehicle lifts
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FR1580499A (en) * 1968-07-18 1969-09-05
SE343267B (en) * 1970-01-26 1972-03-06 O Wennberg
JPS478737U (en) * 1971-03-01 1972-10-02
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Also Published As

Publication number Publication date
BR8008973A (en) 1981-10-20
SE417309B (en) 1981-03-09
NO148221B (en) 1983-05-24
GB2075469A (en) 1981-11-18
DE3049687C2 (en) 1989-11-09
WO1981000097A1 (en) 1981-01-22
JPS56500847A (en) 1981-06-25
SE7905980L (en) 1981-01-10
EP0037811B1 (en) 1984-01-25
DE3049687T1 (en) 1982-02-25
NO148221C (en) 1983-08-31
GB2075469B (en) 1983-03-09
NO810769L (en) 1981-03-05
SU1111683A3 (en) 1984-08-30
JPH0138756B2 (en) 1989-08-16

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