EP0389781A1 - Châssis de levage - Google Patents

Châssis de levage Download PDF

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Publication number
EP0389781A1
EP0389781A1 EP90103067A EP90103067A EP0389781A1 EP 0389781 A1 EP0389781 A1 EP 0389781A1 EP 90103067 A EP90103067 A EP 90103067A EP 90103067 A EP90103067 A EP 90103067A EP 0389781 A1 EP0389781 A1 EP 0389781A1
Authority
EP
European Patent Office
Prior art keywords
scissor
lifting
lifting platform
platform according
stage
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Withdrawn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
EP90103067A
Other languages
German (de)
English (en)
Inventor
August Mayr
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.)
Individual
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 EP0389781A1 publication Critical patent/EP0389781A1/fr
Withdrawn legal-status Critical Current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
    • 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 lifting platform according to the preamble of claim 1.
  • lifting platforms have long been known, available on the market and in use.
  • the object of the present invention is therefore to improve such lifts so that their stability is essentially independent of the extension height.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • a lifting platform is created whose lifting scissors taper when it is raised, i.e. whose lower area is only slightly narrower when the lifting platform is raised than when the lifting scissors are retracted. This significantly improves the stability of the lift.
  • the lifting platform according to FIGS. 1 to 5 essentially consists of the actual stage 10 and two lifting scissors 11 carrying the stage 10, of which only one can be seen in the side views shown.
  • Each lifting shear 11 in turn consists of two groups of scissor bars 12, 13, which are arranged in two mutually parallel vertical planes, such that when the lifting shears 11 (FIG. 1) are retracted, the scissor bars of each group lie on one another. All scissor bars 12, 13 have the same length and are slightly kinked in the middle, the kink angle ⁇ (FIG. 3) being 170 °, for example.
  • Each scissor bar in each group is equipped with three scissor bars of the other group in an articulated manner, in the middle and at both ends.
  • the bottom scissor bar of each group is provided with a wheel 14, 15 at its lower end.
  • the uppermost scissor beam 12 of the one beam group has at its upper end an impeller 16 which runs in a running rail 17 located on the underside of the stage 10, whereas the upper end of the uppermost scissor beam 13 of the other group is articulated but pivotably on the stage floor.
  • 18 pneumatic or hydraulic lifting cylinders are designated, which are arranged in a manner known per se between the scissor bars and serve to extend the lifting scissors; 1 and 2, these lifting cylinders are omitted for the sake of clarity.
  • the degree of tapering of the lifting scissors 11 when starting up depends on the selected articulation angle ⁇ ; the smaller the angle ⁇ , the stronger the kink, the more tapered. the extended lifting scissors upwards.
  • Kinks are useful angle ⁇ between 175 ° and 165 °.
  • the side lengths of these diamonds are labeled with two different letters, namely L as an abbreviation for "long” and K as an abbreviation for "short". All side lengths L are identical to one another, just as all side lengths K are identical to one another. It can be seen that each of the diamonds has three sides of equal length and a shorter or longer side.
  • the diamond A has three sides L and one side K, the diamond B above it has three sides K and one side L, this row alternatingly continuing upwards.
  • the deviating side of each diamond is clearly emphasized in FIG. 4 by dashes. The sequence shown is very expedient for reasons of stability of the lifting shears, but other orders are also possible, provided that each diamond has three identical sides and a different length in length.
  • each scissor beam 12, 13 has a short and a long section.
  • the difference between sections L and K depends on the degree of buckling of the scissor beams. It is only given as an indication that the short sections K are 3% shorter than the long sections L. A useful range is approximately 1 to 5% length difference.
  • each scissor beam 12, 13 has at its ends two holes spaced a short distance apart in the longitudinal direction, as is indicated, for example, at 22a, with the hinge pin then, for example, through the inner hole of the one and the outer hole of the other scissor beam is inserted.
  • 4 shows how the outer joint connections 21 and 22 have to be made in order to obtain the required section lengths K and L when the center joints 20 are set. The size of the displacement of the central joints 20 and the outer joints 21, 22 results from the above-mentioned difference in the sections K and L inevitably.
  • the kinking of the scissor bars and the explained displacement of their articulation points result in a fully retractable and fully extendable lifting scissors with the desired tapering when extended.
  • the number and length of the scissor bars can be adapted to the respective requirements.
  • FIGS. 6 and 7 show a particularly expedient embodiment of the invention, in which another power drive is used to actuate the lifting scissors.
  • the power drive consists of a motor 30, preferably an electric motor with forward and return, which is attached to the underside of the stage 10.
  • An accumulator can be used as the power supply, for example, which is arranged at the lower end of the lifting shears and is connected to the motor 30 via a cable.
  • the motor 30 drives a cable drum 31 via a worm gear, the free end of the cable 32 wound on the drum 31 being fastened to the upper end of the uppermost scissor beam 12 which carries the impeller 16 which corresponds to that of the embodiment of the lifting platform described previously.
  • the function of this power drive can be understood from the drawing.
  • the motor 30 rotates the cable drum 31 counterclockwise, then the cable 32 is wound up and the scissor bar 12 is pulled in the direction of the drum 31, i.e. to the left in the drawing, with the result that the lifting scissors move the platform 10 upwards, until the highest stage position is reached. If the motor 30 then rotates in the opposite direction, that is to say in the clockwise direction, then the cable 32 unwinds, the weight of the platform 10 pushing the scissor bar 12 to the right, while keeping the cable 32 in tension until the impeller 16 has reached the right end of its running rail 17, with which the lifting scissors is then completely retracted, in accordance with FIG. 1 of the first exemplary embodiment. As before previously mentioned, the stage 10 is supported by two lifting scissors lying one behind the other on the drawing. Advantageously, in order to achieve a uniform drive, the two rollers 16 are connected by a shaft, or two motors 30 synchronized with one another with rope drums 31 are attached to the stage 10.
  • the embodiment of the lifting platform according to FIGS. 6 and 7 has yet another special feature, namely the division of the stage 10 into a circumferential stage railing 10a and a stage platform 10b.
  • the platform 10b is provided on its underside with the running rail 17, in which the roller 16 of the uppermost scissor beam 12 engages, and is also articulated to the uppermost scissor beam 13 of the other beam group.
  • the motor 30 is also fixed to the plate 10b. This means that the platform 10b is raised and lowered by and with the lifting scissors, corresponding to the stage 10 of the embodiment according to FIGS. 1 to 5.
  • the stage railing 10a is separated from the platform 10b and has a slightly larger outline, so so that the circumferential railing 10a is displaceable perpendicular to the platform level.
  • the displacement is brought about by a roller 33 which is attached to the lower edge of the railing 10a and has a circumferential guide groove, which is seated on the cable 32.
  • the railing 10a is fully extended upward, and thus represents the necessary protection for a person standing on the platform 10b.
  • This extended position is also maintained when the platform 10b is lowered, because yes, also in the process of how previously mentioned, the rope 32 remains in tension due to the weight of the platform 10b.
  • the platform 10b and the railing 10a can be connected to one another in this way, for example by means of a parallelogram linkage, which ensures that the railing 10b is raised exactly vertically; a locking of the railing 10b which can be released by the operator can also be provided in its raised position.
EP90103067A 1989-03-29 1990-02-16 Châssis de levage Withdrawn EP0389781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910180A DE3910180A1 (de) 1989-03-29 1989-03-29 Hebebuehne
DE3910180 1989-03-29

Publications (1)

Publication Number Publication Date
EP0389781A1 true EP0389781A1 (fr) 1990-10-03

Family

ID=6377391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103067A Withdrawn EP0389781A1 (fr) 1989-03-29 1990-02-16 Châssis de levage

Country Status (4)

Country Link
US (1) US5056626A (fr)
EP (1) EP0389781A1 (fr)
CA (1) CA2011692A1 (fr)
DE (1) DE3910180A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600077100A1 (it) * 2016-07-22 2018-01-22 Goppion Spa Vetrina museale a campana, con meccanismi di sollevamento a pantografo

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5285992A (en) * 1992-07-14 1994-02-15 Brown Ronald G Adjustable step stool
IT1307565B1 (it) * 1999-04-19 2001-11-14 Sisti Lighting S P A De Apparecchiatura di sollevamento, in particolare per attrezzature diilluminazione e non, per studi di ripresa.
DE19948054A1 (de) * 1999-10-06 2001-04-26 Michael Tremer Entkalkungsvorrichtung
WO2002063111A1 (fr) * 2001-02-07 2002-08-15 Charles Hoberman Ensembles circulaires pourvus d'un maillon central
US11795041B2 (en) * 2021-06-07 2023-10-24 Herkules Equipment Corporation Scissor arm lift assembly and method of operating the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2363784A (en) * 1943-06-28 1944-11-28 Gerich Valentine Collapsible crane or platform tower
DE1898084U (de) * 1964-02-27 1964-08-06 Ver Flugtechnische Werke Ges M Scherenhubtisch, insbesondere zur aufnahme von boxpaletten.
DE3315136C1 (de) * 1983-04-27 1984-08-23 Anton Ruthmann Gmbh & Co, 4423 Gescher Scheren-Hubbühne
DE3427742A1 (de) * 1984-07-27 1986-01-30 Heinrich Ing.(grad.) 4000 Düsseldorf Brockerhoff Hebeeinrichtung mit scherengestaenge und flaschenzug
US4625944A (en) * 1984-03-16 1986-12-02 Standard Manufacturing Company, Inc. Safety device for lifting apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476016A (en) * 1967-10-20 1969-11-04 Cascade Corp Apparatus for producing coordinated,simultaneous actuation of multiple rams
US3672104A (en) * 1970-12-23 1972-06-27 Trw Inc Nesting three dimensional lazy tong structure
DE3008557A1 (de) * 1980-03-06 1981-09-17 Bühnenbau Rolf Schnakenberg GmbH & Co KG, 5600 Wuppertal Hoehenverstellbarer podestbock fuer theaterbuehnen oder dgl.
DE8009329U1 (de) * 1980-04-03 1981-04-02 Rüttinger, Armin, 8990 Lindau Hubvorrichtung fuer deckenplatten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2363784A (en) * 1943-06-28 1944-11-28 Gerich Valentine Collapsible crane or platform tower
DE1898084U (de) * 1964-02-27 1964-08-06 Ver Flugtechnische Werke Ges M Scherenhubtisch, insbesondere zur aufnahme von boxpaletten.
DE3315136C1 (de) * 1983-04-27 1984-08-23 Anton Ruthmann Gmbh & Co, 4423 Gescher Scheren-Hubbühne
US4625944A (en) * 1984-03-16 1986-12-02 Standard Manufacturing Company, Inc. Safety device for lifting apparatus
DE3427742A1 (de) * 1984-07-27 1986-01-30 Heinrich Ing.(grad.) 4000 Düsseldorf Brockerhoff Hebeeinrichtung mit scherengestaenge und flaschenzug

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600077100A1 (it) * 2016-07-22 2018-01-22 Goppion Spa Vetrina museale a campana, con meccanismi di sollevamento a pantografo
EP3272252A1 (fr) * 2016-07-22 2018-01-24 Goppion S.p.A. Vitrine-cloche avec systeme de pantographe pour musee
US9895008B2 (en) 2016-07-22 2018-02-20 Goppion S.P.A. Bell-type museum showcase, having pantograph lifting mechanisms

Also Published As

Publication number Publication date
CA2011692A1 (fr) 1990-09-29
DE3910180A1 (de) 1990-10-04
DE3910180C2 (fr) 1991-01-10
US5056626A (en) 1991-10-15

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