EP0356761B1 - Dispositif de levage à ciseaux, en particulier pour une plate-forme de travail - Google Patents

Dispositif de levage à ciseaux, en particulier pour une plate-forme de travail Download PDF

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Publication number
EP0356761B1
EP0356761B1 EP89114506A EP89114506A EP0356761B1 EP 0356761 B1 EP0356761 B1 EP 0356761B1 EP 89114506 A EP89114506 A EP 89114506A EP 89114506 A EP89114506 A EP 89114506A EP 0356761 B1 EP0356761 B1 EP 0356761B1
Authority
EP
European Patent Office
Prior art keywords
scissor
arms
scissors
arm
arrangement according
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.)
Expired - Lifetime
Application number
EP89114506A
Other languages
German (de)
English (en)
Other versions
EP0356761A1 (fr
Inventor
Martin Haak, Sr.
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.)
HOLLAND LIFT BV
Original Assignee
HOLLAND LIFT BV
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
Priority claimed from PCT/NL1988/000038 external-priority patent/WO1990001456A1/fr
Priority claimed from DE8904060U external-priority patent/DE8904060U1/de
Application filed by HOLLAND LIFT BV filed Critical HOLLAND LIFT BV
Priority to AT89114506T priority Critical patent/ATE86226T1/de
Publication of EP0356761A1 publication Critical patent/EP0356761A1/fr
Application granted granted Critical
Publication of EP0356761B1 publication Critical patent/EP0356761B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/22—Lazy-tongs mechanisms
    • 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
    • B66F11/042—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 actuated by lazy-tongs mechanisms or articulated levers

Definitions

  • the invention relates to a scissor lifting device, in particular for a working platform, with a lower frame, an upper frame, a scissor gear connecting both frames in the form of a Nuremberg scissors with at least two scissors arranged one above the other, each scissor having two scissor arms, each of which is approximately in the middle Bearing for a scissor pin that connects both scissor arms articulated about an imaginary scissor axis, and of which each scissor arm has connecting bearings for connecting bolts at its ends, and wherein a first scissor arm of the lower scissors articulated with its lower end and the lower end of the other scissor arm slidably and articulatedly connected to the subframe, and with a drive for the scissors gear.
  • a scissor lifting device of this type is known from DE-A 31 51 031.
  • the previously known scissor lifting devices have a scissor gear with two or more scissors, which are connected by cross struts, to thereby form a torsionally rigid box.
  • DE-A1-31 51 031 arrange the scissor arms of each individual scissors at a distance from each other and connect these scissor arms in the middle by means of a transverse yoke and provide intermediate supports at the ends of the arms of the scissors arranged one above the other so that each of the individual scissors results in a box-like structure with less construction leads.
  • the invention has for its object to provide a scissor lifting device, in particular for a working platform, with the features mentioned above, which compared to the scissor lifting device known from DE-A1-31 51 031 with a scissor gear in the manner of a Nuremberg scissors, an even more simplified design having.
  • the invention is based on the idea of consciously accepting the tilting of the articulated connections. This creates the possibility that in a scissor gear designed as a Nuremberg scissors with at least two superposed scissors for connecting the scissor arms of each pair of scissors no cross yoke and no intermediate beams are required.
  • the result of the scissor lifting device according to the invention is that the actuation or asymmetrical loading of the scissor lifting device prestresses the joints of the scissors by torsional moments, so that these joints are made free of play during operation.
  • the invention therefore deliberately accepts a deterioration in the efficiency of the scissor drive in order to create a very simple and yet stable construction of a scissor lifting device.
  • the drive conditions when the scissors gear is folded i.e. when the upper frame is completely lowered, are the most unfavorable
  • the scissors axis is arranged at a distance above the plane defined by the connecting axes at the end of this swivel arm. This results in more favorable leverage ratios for transmitting the power of the drive created on the scissors gear. It has proven to be advantageous to provide this measure for all scissor arms of the scissor gear.
  • the scissor lifting device for a working platform shown in the drawing has a scissor gear with three scissor axes 4 of three scissors 1, 2 and 3 arranged one above the other.
  • the scissor gear connects a lower frame 10 to an upper frame 11.
  • Each of these scissors 1, 2 and 3 consists of only two scissor arms 1a and 1b or 2a and 2b and 2a and 2b as well as 3a and 3b, which are pivotally connected to one another in their center.
  • the scissor arms are hollow and square in cross-section.
  • Each scissor arm a and b of a pair of scissors is pivotally connected at least at one of its ends about a connecting axis 5 to the end of a scissor arm b or a of an adjacent pair of scissors.
  • the articulated connections with the axes 5 are designed exactly like the articulated connections with the axes 4.
  • the lower end of the swivel arm 1a is pivotally connected to the subframe 10 about an axis 6, which in the exemplary embodiment shown is designed as a chassis that can be moved on wheels.
  • the lower end of the scissor arm 1b of the lowermost scissors 1 is pivotally and displaceably connected to the subframe 10 about an axis 7.
  • a drive 12 designed as a lifting cylinder in the illustrated embodiment is pivotally connected to the subframe 10 by its cylinder.
  • the piston rod of the drive 12 engages at a point of application below the scissor axis 4 of the scissor arm 1a.
  • the upper end of the scissor arm 3b is pivotally connected about an axis 8 to the upper frame 11, which carries a working platform.
  • the upper end of the scissor arm 3a is pivotally and displaceably connected to the upper frame 11 about an axis 9.
  • the scissor arms 1a, 2a and 3a have bores 13 for bearing bolts 15 which are each firmly connected to the outside of the corresponding scissor arms 1a, 2a and 3a by means of a weld seam 19.
  • the scissor arms 1b, 2b and 3b have bores 14 for a bush 16 which is provided with a pressed-in bearing bush 17 for the bearing bolt 15.
  • the bushes 16 are fastened in the bores 14 with the scissor arms 1b, 2b and 3b on the outside thereof by means of weld seams 20.
  • the middle bores 13 and 14 for the scissor axes 4 are arranged at a distance a above the plane, through the connecting axes 5 the ends of the scissor arms is defined.
  • This arrangement of the scissor axes 4 results in more favorable lever ratios for the attack of the drive 12 when the upper frame 11 is in the lowered state.
  • the bearing bolts 15, which are firmly connected to the scissor arms 1a, 2a and 3a, are inserted into the corresponding bearing bushes 17 of the scissor arms 1b, 2b and 3b and secured by retaining rings 18 which are fastened to the bolt 15 by screws 18 '.
  • Distance d of the articulated scissor arms a, b of a pair of scissors is greater than 1/20 of the thickness h of the profile of the scissor arms measured perpendicular to the articulation axis 4, 5 and not greater than half this profile thickness h.

Landscapes

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

Claims (7)

  1. Dispositif de levage à ciseaux, notamment pour une plate-forme de travail, comportant :
    a) un châssis inférieur (10),
    b) un châssis supérieur (11),
    c) une transmission à ciseaux reliant les deux châssis (10 et 11) et se présentant sous la forme d'un ciseau de Nuremberg avec au moins deux ciseaux disposés l'un au-dessus de l'autre,
    d) chaque ciseau comportant deux branches (a, b), dont chacune comporte à peu près en son milieu un palier pour un tourillon, qui relie les deux branches de ciseaux l'une avec l'autre de façon articulée autour d'un axe imaginaire (4) de ciseau , chaque branche de ciseau comportant à ses extrémités des paliers de liaison pour des tourillons de liaison (5, 6, 7, 8, 9), et
    e) où une première branche du ciseau (1a) le plus bas est reliée par son extrémité inférieure de façon articulée avec le châssis inférieur tandis que l'extrémité inférieure de l'autre branche de ciseau (1b) est reliée de façon articulée et avec possibilité de translation avec le châssis inférieur, et
    f) le dispositif comportant en outre un entraînement (12) pour la transmission à ciseaux,
    - caractérisé en ce que le système d'entraînement (12) agit sur une des branches (1a, 1b) du ciseau situé complètement en bas à une certaine distance d'espacement d'un plan central imaginaire de la transmission à ciseaux, qui passe entre les branches de ciseaux perpendiculairement à l'axe de ciseau (4) imaginaire.
  2. Dispositif de levage à ciseaux selon la revendication 1, caractérisé en ce que le système d'entraînement (12) agit sur la première branche de ciseau (1a) dans une zone correspondant à son milieu.
  3. Dispositif de levage à ciseaux selon la revendication 1 ou 2, caractérisé en ce qu'au moins pour la branche de ciseau (1a) avec laquelle est relié le système d'entraînement (12), l'axe imaginaire de ciseau (4) est disposé à une distance d'espacement (a) au-dessus du plan qui est défini par les axes (5) des tourillons de liaison prévus aux extrémités de cette branche de ciseau.
  4. Dispositif de levage à ciseaux selon une des revendications 1 à 3, caractérisé en ce que les tourillons de ciseaux et de liaison sont engagés dans les deux branches de ciseaux reliées par eux (1a, 1b ; 2a, 2b ; 3a, 3b) à travers toutes leurs sections.
  5. Dispositif de levage à ciseaux selon une des revendications 1 à 4, caractérisé en ce que les tourillons de ciseaux et de liaison sont fixés dans une branche de ciseau (1a, 2a, 3a) et sont engagés dans un coussinet de palier (16), qui est fixé dans l'autre branche de ciseau (1b, 2b, 3b).
  6. Dispositif de levage à ciseaux selon une des revendications 1 à 5, caractérisé en ce que l'espacement intérieur (d) des branches (a, b), reliées entre elles de façon articulée, d'un ciseau est supérieur à 1/20 de l'épaisseur (h), mesurée perpendiculairement aux axes d'articulatiosn (4, 5), du profil des branches de ciseau.
  7. Dispositif de levage à ciseaux selon la revendication 6, caractérisé en ce que la distance d'espacement précitée (d) n'est pas plus grande que la moitié de l'épaisseur précitée des profils de branches de ciseaux.
EP89114506A 1988-08-10 1989-08-05 Dispositif de levage à ciseaux, en particulier pour une plate-forme de travail Expired - Lifetime EP0356761B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89114506T ATE86226T1 (de) 1988-08-10 1989-08-05 Scherenhubvorrichtung, insbesondere fuer eine arbeitsbuehne.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
WOPCT/NL88/00038 1988-08-10
PCT/NL1988/000038 WO1990001456A1 (fr) 1988-08-10 1988-08-10 Mecanisme de levage a parallelogrammes articules pour plateformes de travail
DE8904060U DE8904060U1 (fr) 1989-04-03 1989-04-03
DE8904060U 1989-04-03

Publications (2)

Publication Number Publication Date
EP0356761A1 EP0356761A1 (fr) 1990-03-07
EP0356761B1 true EP0356761B1 (fr) 1993-03-03

Family

ID=25954609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114506A Expired - Lifetime EP0356761B1 (fr) 1988-08-10 1989-08-05 Dispositif de levage à ciseaux, en particulier pour une plate-forme de travail

Country Status (4)

Country Link
US (1) US5113972A (fr)
EP (1) EP0356761B1 (fr)
DE (1) DE58903646D1 (fr)
ES (1) ES2038383T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2115870C (fr) * 1993-08-31 1999-01-05 Kenneth J. Zimmer Plate-forme de travail aerienne munie d'une seule poutre
US6276489B1 (en) 1999-02-10 2001-08-21 Genie Industries, Inc. Flanged cross tubes for use in scissors linkages
US6637711B2 (en) * 2001-06-08 2003-10-28 Draper, Inc. Projector lift
US7631848B2 (en) 2001-06-08 2009-12-15 Draper, Inc. Projector lift
WO2007146962A2 (fr) * 2006-06-12 2007-12-21 Genie Industries, Inc. Ensemble de joint et procédés relatifs
US9670039B1 (en) 2011-06-03 2017-06-06 Draper, Inc. Projector lift
FR3035098B1 (fr) * 2015-04-18 2017-03-31 Haulotte Group Nacelle elevatrice a mecanisme de levage en ciseaux
USD841276S1 (en) * 2016-04-04 2019-02-19 Manitou Bf Aerial work platform
US11702327B2 (en) * 2017-05-09 2023-07-18 The Board Of Regents For Oklahoma State University Apparatus for branched scissor linkage and associated auxetic mechanisms
WO2018208926A1 (fr) * 2017-05-09 2018-11-15 The Board Of Regents For Oklahoma State University Appareil de liaison en ciseaux ramifiés et mécanismes auxétiques associés
USD854775S1 (en) * 2017-06-28 2019-07-23 G.S.Ace Industry Co., Ltd. Elevation apparatus for lift table

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US682932A (en) * 1900-09-06 1901-09-17 Israel Louis Dreeben Truck.
US1261633A (en) * 1917-07-23 1918-04-02 Jacob Frank Shuford Combination truck and movable platform.
US1448932A (en) * 1922-03-31 1923-03-20 Jesse P Mayhugh Portable extensible support
US1592770A (en) * 1925-12-03 1926-07-13 James A Reynolds Jr Shoe or platform raising device
US2402579A (en) * 1945-05-24 1946-06-25 Weaver Mfg Co Load lifter
US3621940A (en) * 1969-11-03 1971-11-23 Alois Lodige Scissor action hoist
GB1502778A (en) * 1974-12-10 1978-03-01 Rogers D Scissor lift mechanism with actuating device
FR2317218A1 (fr) * 1975-07-07 1977-02-04 Systems Manufacturing Co Elevateur a croisillons articules
US4130178A (en) * 1977-03-28 1978-12-19 Smith Raymond E Jun Elevating device
DE3151031A1 (de) * 1981-11-13 1983-05-19 Trepel Ag, 6200 Wiesbaden "scherenhubtisch"
EP0089389B1 (fr) * 1982-03-22 1986-11-26 Coates Management Pty. Ltd. Dispositif élévateur
DE3248414A1 (de) * 1982-11-05 1984-06-28 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hubvorrichtung, insbesondere hebebuehne fuer kraftfahrzeuge
US4576249A (en) * 1984-09-24 1986-03-18 Zima John P Device for fighting fires in highrise buildings and towers
DE3527324A1 (de) * 1985-07-31 1987-02-12 Trepel Ag Scherenhubtisch
SE456342B (sv) * 1986-07-04 1988-09-26 Edmo Torbjoern Ab Lyftmekanism med atminstone tva inbordes via en led eller axel svengbart forbundna saxarmar
DE8706017U1 (fr) * 1987-04-25 1987-06-19 Langewellpott, Ernst, 4992 Espelkamp, De
US4930598A (en) * 1988-07-25 1990-06-05 501 Sky Climber, Inc. Scissors lift apparatus

Also Published As

Publication number Publication date
US5113972A (en) 1992-05-19
DE58903646D1 (de) 1993-04-08
ES2038383T3 (es) 1993-07-16
EP0356761A1 (fr) 1990-03-07

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