EP1007468A1 - Plateforme de travail elevatrice - Google Patents

Plateforme de travail elevatrice

Info

Publication number
EP1007468A1
EP1007468A1 EP98924101A EP98924101A EP1007468A1 EP 1007468 A1 EP1007468 A1 EP 1007468A1 EP 98924101 A EP98924101 A EP 98924101A EP 98924101 A EP98924101 A EP 98924101A EP 1007468 A1 EP1007468 A1 EP 1007468A1
Authority
EP
European Patent Office
Prior art keywords
work platform
carriage
aerial work
platform according
mast
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.)
Withdrawn
Application number
EP98924101A
Other languages
German (de)
English (en)
Inventor
Johannes C. F. G. Van Mol
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.)
HEK Manufacturing BV
Original Assignee
HEK Manufacturing 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 DE19717060A external-priority patent/DE19717060C1/de
Application filed by HEK Manufacturing BV filed Critical HEK Manufacturing BV
Publication of EP1007468A1 publication Critical patent/EP1007468A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/18—Scaffolds primarily resting on the ground adjustable in height
    • E04G1/20—Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
    • 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

Definitions

  • the invention relates to an aerial work platform with a work platform which is vertically movable on at least two masts arranged parallel to one another and which has a carriage guided thereon for each mast, which has a drive unit, the work platform being supported via connecting elements on the carriage and the power transmission between the mast and the carriage is form-fitting.
  • Such aerial work platforms are known from the prior art. They are usually erected in the area of building facades instead of scaffolding.
  • the work platform of such an aerial work platform encompasses the masts on at least three sides, it being customary for the work platform to also project laterally beyond the two masts.
  • the masts consist of mast elements which are arranged one above the other in shots and connected to one another, so that masts of the desired height can be produced from a large number of mast elements.
  • a drive unit is generally used for power transmission, which is arranged on a motor support plate and has at least one electric motor with a gearbox flanged thereon.
  • the motor support plate is part of the carriage, the transmission having at least one output pinion on the output side, which meshes with a toothed rack attached to the mast.
  • the object of the invention is to develop a generic aerial work platform in such a way that movement compensation of the work platform relative to the masts can be carried out in a simple manner, which is necessary due to the load on the work platform and due to bodywork tolerances, so that large voltages be avoided in the aerial work platform.
  • the solution to this problem provides that the connecting elements between each carriage and the work platform are designed such that the work platform is both limitedly displaceable relative to the carriage in its longitudinal axis direction, and is rotatably supported relative to the carriage to a limited extent at right angles to its longitudinal axis direction .
  • this aerial work platform ensures that the work platform is movable relative to the masts to the extent that a slightly different run of the drive motors for the two carriages can be compensated for.
  • the working platform can namely be moved relative to the carriages in its longitudinal axis direction as well as rotated relative to the carriages. Of course, these relative movements are only possible to a very small extent in order not to negatively influence the work safety of such an aerial work platform. Due to the mobility of the working platform relative to the carriage, however, moments in the connection points between the Carriage and the work platform significantly reduced. Tension is also reduced in the masts and in particular in the drive elements, namely the toothed racks and the pinion of the drive units engaging in the toothed racks.
  • the connecting elements consist of a rod with a cylindrical cross section and a spherical element mounted in a holder.
  • the rod is suitable for enabling an axial displacement of the work platform relative to the carriage, whereas the ball element enables the work platform to be rotated relative to the carriage.
  • the rod is preferably connected to the work platform and the ball element can be moved relative to the rod.
  • the rod is designed to be stationary, whereas the spherical element can be moved along the rod.
  • the rod is mounted in a bore penetrating the spherical element.
  • the ball element can be moved relative to the rod in its longitudinal axis direction and rotated around the rod.
  • Each carriage preferably has two rods which are mounted in corresponding spherical elements.
  • one bar is located near the carriage and the other bar is located at the end of the work platform, which is spaced from the carriage.
  • the carriage preferably has a motor support plate with support profiles arranged at right angles thereto, on which the work platform is supported.
  • the motor support plate has an opening through which at least the output pinions of the transmission engage in order to mesh with the rack.
  • the gearbox is fastened to the motor support plate with a housing, preferably screwed, and carries the end of the motor support plate Drive motor, which projects with its shaft having a drive pinion into the transmission and is screwed to the housing of the transmission.
  • the holder for the ball element is designed as a cup-shaped bearing shell, which has radially opposite openings which receive the rod.
  • the openings also determine a pivoting angle of the rods around the longitudinal axis of the bearing shell. A further degree of freedom of the rod relative to the bearing shell and thus to the carriage is thus determined.
  • the bearing shell is preferably closed with a lid.
  • the bearing shell can be filled with a lubricant, for example grease, in order to ensure wear-free movement of the ball element in the bearing shell.
  • a lubricant for example grease
  • the bearing shell and / or the spherical element and / or the rod to have a friction-reducing surface coating, for example polytetraflurethylene, in the region of the spherical element.
  • the lid placed on the bearing shell prevents the ingress of dirt particles, such as mineral grains, dust or the like. It must be taken into account here that the aerial work platforms in question are used on construction sites with a corresponding amount of dirt.
  • the holder is supported on a profile of the carriage with the interim storage of a force measuring device.
  • the static load on the work platform can thus be measured via the force measuring device. If the static load on the work platform reaches an impermissibly high value specified in a computer, the drive is blocked via the computer. A start, that is to say a movement of the work platform, is then prevented until it is signaled by the force measuring device that the impermissibly high load on the work platform no longer exists.
  • the force measuring device is preferably designed as a strain gauge.
  • each carriage has two connecting elements with associated force measuring devices.
  • the loads on the work platform can be measured in the longitudinal direction and in a direction perpendicular to the longitudinal direction of the work platform.
  • the direction perpendicular to the longitudinal direction of the work platform lies in the surface plane of the work platform, so that a force level is determined via the two direction vectors of these loads, which can also be used to identify the positionally correct signaling of an overload by means of a corresponding computer.
  • Figure 1 shows an aerial work platform in view
  • Figure 2 shows the aerial work platform according to Figure 1 in side view
  • Figure 3 shows a carriage with a schematically shown
  • Figure 4 shows the schematically illustrated carriage according to Figure 3 in plan view
  • Figure 5 shows the mast-guided carriage of the aerial work platform according to Figure 1 in side view
  • Figure 6 shows the carriage according to Figure 5 in a view
  • Figure 7 shows a connecting element between the work platform and the carriage in three views.
  • FIG. 1 shows a lifting platform 1, which is arranged in front of a building 2.
  • the lifting platform 1 consists of two masts 3 and 4, which masts 3 and 4 consist of individual mast elements 5 and 6, which are arranged one above the other to form the masts 3 and 4 and are connected to one another.
  • Each mast 3, 4 has a mast foot 7, 8 which stands on a support surface 10 via height-adjustable support feet 9.
  • the mast base 7, 8 can also have a chassis with which the mast 3, 4 can be moved.
  • the mast foot 7, 8 can be raised so far via the support feet 9 that the undercarriage does not stand on the contact surface 10.
  • the masts 3, 4 are connected to the facade of the building 2 via anchors 11.
  • Each mast 3, 4 has a rack 12, 13 which is fastened to the outside of the mast 3, 4, the rack 12, 13 being divided into individual sections, which sections of the rack 12, 13 have essentially the same length, like the individual mast elements 5, 6.
  • a carriage 14, 15 is arranged such that it can be moved along the masts 3, 4.
  • the carriages 14, 15 are connected to one another via a work platform 16. Accordingly, the work platform 16 can be arranged at different heights in front of the building 2 by means of the carriages 14 and 15 in order to carry out corresponding work on the facade. For safety reasons, the work platform 16 has an essentially all-round railing 18.
  • the carriage 15 is shown in FIGS. 3 and 4. To simplify the design, the carriage 15 is only shown as a rectangular surface.
  • the carriage 15 consists of a plate designed as a motor support plate 22, which has two axes on its lower edge, on the free ends of which guide rollers 38 and 39 are rotatably arranged. These guide rollers 38 and 39 run on the outer surfaces of the mast elements 5 and serve to guide the carriage 15 along the mast 4.
  • the plate of the carriage 15 has guide rollers 27 and 28 which are rotatably mounted on at least one further axis. These guide rollers 27 and 28 rest on the rear rack 30 of the rack 13 and roll on the rear rack 30.
  • the toothing 29 of the toothed rack 12 is arranged on the surface of the toothed rack opposite the rear 30 of the toothed rack.
  • the plate of the carriage 15 carries a drive motor 19 which acts indirectly with its motor axis on a pinion 26, which either meshes directly with the rack or meshes with two output pinions 24 and 25, which in turn mesh with the toothing 29 of the rack 13.
  • the torque of the drive motor 19 is transmitted via the pinion 26 and the output pinions 24 and 25 to the rack 12 arranged in a stationary manner on the masts 3 and 4, so that the carriage 15 along the rack 12 and thus also along the corresponding mast 3, 4th is vertically movable.
  • FIGS. 5 and 6 show the construction of the work platform
  • the carriage 14 is guided on the mast 3.
  • the carriage 14 has the motor support plate 22, which is aligned parallel to the longitudinal extent of the mast 3.
  • the guide rollers 38 and 39 are arranged such that they roll on both sides of a profile carrier 23 of the mast 3.
  • the gear 31 is screwed to the motor support plate 22 so that the two output pinions 24 and 25 mesh with the rack 12.
  • the carriage 14 has profiles 32 which extend at right angles, which are connected to a profile 33 which extends at right angles thereto and are supported by a further oblique profile 34 with respect to the motor support plate 22.
  • bearings are fastened at a distance from one another, with strain gauges 37 being arranged as a force measuring device between the bearings and the support bracket 35. The forces absorbed by the strain gauges 37 are supplied in a manner not shown to a computer which is connected to the drive motors 19 of the lifting platform 1 via an electrical control.
  • connection element 40 is arranged above each bearing and connects the work platform 16 to the carriage 14.
  • Each connecting element 40 consists of a rod 41 arranged in a fixed position on the work platform 16 and a holder 42 designed as a bearing shell, which is cup-shaped and is covered at its open end with a cover 43.
  • a ball element 44 is mounted in the holder 42.
  • the spherical element has a bore which is penetrated by the rod 41.
  • the rod 41 also passes through two radially arranged openings in the holder 42 and is fixed to the work platform 16 via angle elements 45.
  • the connecting elements 40 described above enable the working platform 16 to move in the longitudinal direction of the working platform 16 relative to the masts 3 and 4.
  • the connecting elements 40 enable the working platform 16 to rotate relative to the axes of the output pinions 24 the two drives of the carriage 14 and 15 balanced on the masts 3 and 4, so that an uneven stroke movement of the carriages 14 and 15 relative to one another is possible to a limited extent.
  • the arrangement of the connecting elements 40 in combination with the strain gauges 37 can determine the static load on the work platform 16 with regard to the size and location of the load. The forces detected via the strain gauges 37 are evaluated in a computer (not shown in more detail) and are used to switch off the drive motors 19 when a static overload is reached.
  • the openings in the holder 42 are made slightly larger than the diameter of the rod 41.
  • the bore in the ball element 44 can match the diameter of the rod 41 in a precise fit , since only the necessary axial movement is provided here.
  • connecting element 40 between the work platform 16 and a carriage 14 or 15 is shown in detail in three views in FIG.

Landscapes

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

Abstract

L'invention concerne une plateforme de travail élévatrice comportant une plateforme de travail (16) guidée de façon à pouvoir se déplacer en hauteur sur au moins deux mâts parallèles (3, 4). La plateforme de travail présente, pour chaque mât (3, 4), un chariot (14, 15) qui est guidé sur lesdits mâts et comporte une unité d'entraînement. La plateforme de travail (16) prend appui sur le chariot (14, 15) par l'intermédiaire d'éléments jointifs (40) et le transfert de force entre le mât (3, 4) et le chariot (14, 15) s'effectue par liaison de forme. L'invention vise à équilibrer de façon simple le mouvement de la plateforme de travail (16) par rapport aux mâts (3, 4) sur ce type de plateforme de travail élévatrice, cet équilibre étant nécessaire en raison de la sollicitation de la plateforme de travail (16) et en raison des tolérances de construction, de façon à réduire les contraintes importantes exercées dans la plateforme de travail élévatrice. A cet effet, les éléments jointifs (40) entre chaque chariot (14, 15) et la plateforme de travail (16) sont conçus de sorte que la plateforme de travail (16) est montée de façon à pouvoir coulisser dans son axe longitudinal de manière limitée par rapport aux chariots (14, 15), et de façon à pouvoir tourner perpendiculairement à son axe longitudinal de manière limitée par rapport aux chariots (14, 15).
EP98924101A 1997-04-11 1998-04-08 Plateforme de travail elevatrice Withdrawn EP1007468A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19715176 1997-04-11
DE19715176 1997-04-11
DE19717060A DE19717060C1 (de) 1997-04-11 1997-04-23 Hubarbeitsbühne
DE19717060 1997-04-23
PCT/EP1998/002050 WO1998046517A1 (fr) 1997-04-11 1998-04-08 Plateforme de travail elevatrice

Publications (1)

Publication Number Publication Date
EP1007468A1 true EP1007468A1 (fr) 2000-06-14

Family

ID=26035701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98924101A Withdrawn EP1007468A1 (fr) 1997-04-11 1998-04-08 Plateforme de travail elevatrice

Country Status (5)

Country Link
US (1) US6216820B1 (fr)
EP (1) EP1007468A1 (fr)
AU (1) AU7642098A (fr)
IL (1) IL132241A0 (fr)
WO (1) WO1998046517A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080230321A1 (en) * 2007-03-19 2008-09-25 Frank Csaszar Portable freestanding elevator

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1848427A (en) * 1929-07-06 1932-03-08 Fafnir Bearing Co Hinge
US3516512A (en) * 1968-03-06 1970-06-23 Eisenbau Karl Ladwig Bsb Mobile scaffold
US3851728A (en) * 1973-04-11 1974-12-03 Lowell A Williams Scaffold
JPS5438246B2 (fr) * 1975-01-29 1979-11-20
US4171033A (en) * 1975-12-11 1979-10-16 Rust Willard J Scaffold device
US4293054A (en) * 1980-05-19 1981-10-06 Piat Impalcature Automatiche S.P.A. Scaffolding for supporting lifting working bridges and platforms
DE3828203A1 (de) * 1988-08-19 1990-03-01 Georg Albersinger Federungs- und fuehrungseinheit
US5271482A (en) * 1992-06-05 1993-12-21 Lowell Lift, Inc. Electric light weight portable scaffolding
NL9300629A (nl) * 1993-04-14 1994-11-01 Hek Manufacturing B V In hoogte verstelbaar platform.
SE9402025L (sv) * 1994-02-21 1995-08-22 Alimak Ab Säkerhets- och övervakningsarrangemang i ett arbetsplattformssystem
AUPM644294A0 (en) * 1994-06-23 1994-07-14 Drm Pty Ltd Scaffolding assembly
SE504806C2 (sv) * 1995-08-23 1997-04-28 Alimak Ab Upphängningselement för arbetsplattform-kopplingsvagga

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9846517A1 *

Also Published As

Publication number Publication date
IL132241A0 (en) 2001-03-19
US6216820B1 (en) 2001-04-17
WO1998046517A1 (fr) 1998-10-22
AU7642098A (en) 1998-11-11

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