EP0760350A1 - Appareil de levage - Google Patents

Appareil de levage Download PDF

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Publication number
EP0760350A1
EP0760350A1 EP95113794A EP95113794A EP0760350A1 EP 0760350 A1 EP0760350 A1 EP 0760350A1 EP 95113794 A EP95113794 A EP 95113794A EP 95113794 A EP95113794 A EP 95113794A EP 0760350 A1 EP0760350 A1 EP 0760350A1
Authority
EP
European Patent Office
Prior art keywords
scissor
lifting device
stabilizer
bracing
elements
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Withdrawn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
EP95113794A
Other languages
German (de)
English (en)
Inventor
Anthony Phillip Dunks
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.)
Coad Trevor James
Original Assignee
Coad Trevor James
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 Coad Trevor James filed Critical Coad Trevor James
Priority to EP95113794A priority Critical patent/EP0760350A1/fr
Publication of EP0760350A1 publication Critical patent/EP0760350A1/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Withdrawn legal-status Critical Current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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/0633—Mechanical arrangements not covered by the following subgroups

Definitions

  • This invention relates to a lifting device having improved stability in comparison with known lifting devices.
  • a number of devices are known for lifting loads in which the lifting action is accomplished using, for example, hydraulic rams or a "lazy tong" - type action.
  • hydraulic rams may he positioned to provide directly a vertical lift.
  • Such hydraulic ram devices have high lifting capacity, they are expensive, and, whereas lazy tong devices have the merit of simplicity, they suffer from a lack of stability and strength.
  • the present invention adopts an alternative approach to the devices just mentioned, the device according to the invention offering improved stability.
  • This invention provides: A lilting device for loads of various weights and dimensions, the lifting device having an upwardly and downwardly movable load hearing means, connected to a framework means, which is in turn connected to a base means, which framework comprises:
  • the general aim of the invention is to provide a lifting device which can be raised to the greatest extent possible. Conversely, the aim is also to provide a lifting device which can be lowered or collapsed to the greatest extent possible.
  • the dimensions and angular configuration of the elements may be selected to achieve these desiderata. However, if complete extension or collapse' is not important or subordinate to other desiderata, the respective dimensions and angular configurations may be so chosen.
  • each scissor element is of substantially the same length as corresponding scissor elements.
  • the scissor elements of a scissor means are of different length from the scissor elements of another scissor means, providing in use an upwards and sideways thrust.
  • the scissor elements are offset with respect to each other. This enables the upper and lower scissor elements, and their associated stabilizer means and bracing means, to be collapsed completely.
  • Each stabilizer means according to the invention may take various forms. For example, it may take the form of a disc which pivots around its respective upper or lower pivot point.
  • each stabilizer means comprises a set of stabilizer arms. The respective lengths of the stabilizer arms may be selected to achieve the result desired, but they are desirably of the same length.
  • the respective angular configurations of the stabilizer arms with respect to each other and each associated scissor element may also be selected to achieve the result desired, but they are desirably such that right-angles are formed between the respective stabilizer arm and the bracing means at the half-raised state.
  • Each bracing means preferably comprises two crossed bracing elements, or struts.
  • these bracing elements extend from the end of one set of stabilizer arms to the ends of another set of stabilizer arms connected to the load-bearing means or the base means, that is, upper stabilising arm to lower stabilising arm and lower stabilising arm to upper stabilising arm.
  • the members of each set of bracing elements are equal in length.
  • One member of the lower set of two crossed bracing elements may be left out but in such a case, the remaining bracing element may need to be strengthened.
  • the stabilizer arms at the opposing ends of a particular bracing element are preferably substantially of the same length. However, the stabilizer arms comprising a set may be of differing lengths.
  • the stabilizer means may comprise a single stabilizer arm only.
  • the bracing means may comprise a single bracing element preferably strengthened as compared with the use of crossed bracing elements.
  • a or each stabilizer means may be integral with a or each scissor means, for example, the or both pivot point(s) for the respective bracing element(s) being located on a relatively wide scissor element.
  • each stabilizer means has a drumlike form and the bracing element or elements take the form of a continuous strip which wraps partially or completely around the drumlike means and wherein a scissor element is connected fixedly to the circumference of each drumlike means.
  • the continuous strip has a toothed form on its inner surface which meshes with a corresponding toothed form as the outer surface of the drumlike means.
  • first screw-threaded means or a first hydraulic ram may be applied to or under one or each intermediate pivot point to raise or lower the lifting device.
  • the lifting device according to the invention may be provided with a side-thrust means, for example, a second screw-threaded means or a second hydraulic ram, to tilt the lifting device to enable convenient transfer of a load to the load-bearing means.
  • a side-thrust means for example, a second screw-threaded means or a second hydraulic ram
  • the device according to the invention may be used to lift and transport large pieces of furniture, such as pianos of various types and sizes and billiard tables.
  • the load-bearing means such as a flat platform, may be tilted from the horizontal to allow loading of the piece of furniture. The load-bearing means may then be tilted back to the horizontal and the piece of furniture lifted.
  • lifting devices according to the invention it would be possible to stack lifting devices according to the invention one on top of the other to provide a longer lift. It is also possible to gang lifting devices according to the invention one beside the other, if it is desired to lift a large load, whether heavy or extensive in dimensions.
  • integer 1 indicates the lifting device as a whole.
  • a dotted line indicated by numeral 2 indicates a horizontal plane through a load-bearing means (not shown) such as a platform.
  • a framework 3 joins the load-bearing means to base means 4.
  • Scissor means 5 and 6 are located on opposing sides of framework 3.
  • Scissor means 5 comprises an upper scissor element 7 pivotally joined, at intermediate pivot point 5A, to lower scissor element 8.
  • Scissor means 6 correspondingly comprises an upper scissor element 15 pivotally joined, at an intermediate pivot point 6A, to lower scissor element 16.
  • Scissor means 5 is joined fixedly, at upper pivot point 9 and lower pivot point 10, to upper and lower stabilizer means 11 and 12 respectively.
  • Scissor means 6 is correspondingly joined fixedly, at upper pivot point 17 and lower pivot point 18, to upper and lower stabilizer means 19 and 20 respectively.
  • Upper stabilizer means 11 comprises two stabilizer arms 11A and 11B and lower stabilizer means 12 comprises two stabilizer arms 12A and 12B respectively. Similar comments may be made about upper stabilizer means 19 and lower stabilizer means 20. In this embodiment, all stabilizer arms are of the same length. Upper stabilizer means 11 pivots with respect to load-bearing means 2 at pivot point 9 and lower stabilizer means 12 pivots with respect to base means 4 at pivot point 10. Corresponding remarks may be made about stabilizer means 19 and pivot point 17 and stabilizer means 20 and pivot point 18.
  • An upper bracing means 13 comprises two bracing elements 13A and 13B pivotally joined to upper stabilizer arms 11A and 11B and opposing upper stabilizer arms 19A and 19B.
  • the bracing elements are shown as crossing.
  • a lower bracing means 14 comprises two bracing elements 14A and 14B, again pivotally joined to stabilizer arms 12A and 12B and opposing lower stabilizer arms 20A and 20B. Again, the bracing elements are shown as crossing.
  • the internal angle(s) between stabilizer arms 11A and 11B and corresponding bracing elements 13A and 13B are/is preferably, but not necessarily, a right angle at the half-raised position.
  • the internal angle between the scissor elements 7 and 8 is also a right angle; the same comment applying to the opposing scissors means 6 and scissor elements 15 and 16.
  • the device is shown as being lowered slightly from its position in Figure 1.
  • a circle symbol is shown at pivot points such as 5A and a square symbol is shown at those paints such as 9 where the stabilizer arms are feed with respect to the respective scissor element but pivoted with respect to the load-bearing means 2 (or the base means 4).
  • Figure 3A illustrates the device in its nearly completely lowered state, the circle and square symbols having meanings as before.
  • Figure 4 illustrates the use of scissor means of differing lengths.
  • numeral 30 refers to the device as a whole and numerals 31 and 32 refer to stabilizer means, bracing means and load-bearing means (or base means) assemblies respectively.
  • Numeral 33 refers to the longer scissor means, comprising two scissor elements 34 and 35 respectively pivoting around point 36.
  • numeral 37 refers to a shorter scissor means, comprising scissor elements 38 and 39 pivoting around point 40. In use, raising or expansion of the device would tend to move a load across and up the page, that is, provide a thrust in two directions.
  • FIG. 5 this illustrates a device where the stabilizer means are of differing sizes.
  • numeral 50 refers to the device as a whole and numerals 51 and 52 to corresponding scissor means.
  • One the of the stabilizer means assembly is indicated by numeral 53 and the associated load-bearing means is indicated by numeral 54.
  • a shatter stabilizer means 55 located at one end of stabilizer means assembly 53, comprises two short stabilizer arms 56 and 57.
  • a longer stabilizer means 58 comprises two stabilizer arms 59 ad 60.
  • the other stabilizer means assembly is indicated by numeral 61.
  • a device according to the invention is indicated generally by 80.
  • Numerals 81 and 82 refer to load-bearing means and base means respectively.
  • Numeral 83 indicates a means to supply thrust such as a screw-threaded means of a hydraulic ram and is located between a thrust support 84 and a pivot point 85 in scissor means 86.
  • the thrust supply means may be used to act upon the various pivot points in the device or stacked or gaged devices.
  • numeral 100 indicates an upper device according to the invention stacked upon a lower device according to the invention indicated by numeral 101.
  • the stacked devices are located on base means 102.
  • a thrust supply means 103 acts between base means 102 and a pivot point in lower device 101; compare Figure 6.
  • Upper and lower devices 100 and 101 are joined by collapsible tetragonal means 104. Considering one side of tetragonal means 104, upper arm 105 is joined to lower arm 106 at pivot point 107. Considering the other side of the tetragonal means, upper arm 108 is integral with a scissor element 109 of upper device 100. Similarly lower arm 110 is integral with scissor element 111 of lower device 101.
  • Upper arm 108 and lower arm 110 pivot around point 112.
  • Figures 8 to 10 illustrate six different modes of use of a thrust supply means, with the devices according to Figure 1 attached in stacks.
  • integer 201 indicates the lifting device as a whole.
  • Dotted line 202 indicates a load-beating means such as a platform.
  • a framework 203 connects the load-bearing means to base means 204.
  • Scissor means 205 and 206 are located on opposing sides of framework 203.
  • Scissor means 205 comprises an upper scissor element 207 pivotally joined, at intermediate pivot point 205A, to lower scissor element 208.
  • Scissor means 206 correspondingly comprises an upper scissor element 215 pivotally joined, at an intermediate pivot point 206A, to lower scissor element 216.
  • Scissor means 205 is joined, at upper point 207A and lower point 208A, to upper and lower drumlike stabilizer means 211 and 212 respectively. These stabilizer means rotate about pivot points 209 and 210 respectively.
  • Continuous strip bracing means 213 and 214 extend around and in contact with drumlike stabilizer means 211 and 212 respectively.
  • Scissor means 206 is correspondingly joined, at upper point 215A and lower point 216A, to upper and lower drumlike stabilizer means 219 and 220 respectively. These stabilizer means rotate about pivot points 217 and 218 respectively.
  • Figures 12 and 13 illustrate different configuration for scissor means as compared with the similar embodiment of Figure 11.
  • integer 301 indicates the lifting device as a whole.
  • Dotted fine 302 indicates a load-bearing means such as a platform.
  • a framework 303 joins the load-bearing means to base means 304.
  • Scissor means 305 and 306 are located on opposing sides of framework 303.
  • Scissor means 305 comprises an upper scissor element pivotally Joined, at intermediate pivot point 305A, to lower scissor element 308.
  • Scissor means 306 correspondingly comprises an upper scissor element 315 pivotally joined, at an intermediate 306A, to lower scissor element 316.
  • Scissor means 305 is joined, at upper point 307A and lower point 308A, to upper and lower drumlike stabilizer means 311 and 312 respectively. These stabilizer means rotate about pivot points 309 and 310 respectively.
  • a toothed continuous strip bracing means 313 extends around and in contact with drumlike stabilizer means 311 and 319, each of which has a corresponding outer toothed surface. These drumlike stabilizer means rotate about pivot points 309 and 317
  • a partial toothed continuous strip bracing means 314 extends around and in contact with drumlike stabilizer means 312 and 320, each of which has a corresponding partial outer toothed surface. These drumlike stabilizer means rotate about pivot points 310 and 318 respectively.
  • Figure 15 illustrates an embodiment 401 which may be considered as an amalgam of the embodiment of Figures 11 and 14.
  • the upper strip bracing means 402 is continuous whereas the lower strip bracing means 403 extends partially only around the corresponding lower drumlike stabilizer means.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP95113794A 1995-09-01 1995-09-01 Appareil de levage Withdrawn EP0760350A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95113794A EP0760350A1 (fr) 1995-09-01 1995-09-01 Appareil de levage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95113794A EP0760350A1 (fr) 1995-09-01 1995-09-01 Appareil de levage

Publications (1)

Publication Number Publication Date
EP0760350A1 true EP0760350A1 (fr) 1997-03-05

Family

ID=8219570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113794A Withdrawn EP0760350A1 (fr) 1995-09-01 1995-09-01 Appareil de levage

Country Status (1)

Country Link
EP (1) EP0760350A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1005221B (el) * 2005-07-01 2006-05-18 Δυσπαραμορφωτος τηλεσκοπικος μηχανισμος
WO2023010433A1 (fr) * 2021-08-05 2023-02-09 Terex South Dakota, Inc. Dispositif élévateur

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315136C1 (de) * 1983-04-27 1984-08-23 Anton Ruthmann Gmbh & Co, 4423 Gescher Scheren-Hubbühne
US4499970A (en) * 1982-06-25 1985-02-19 Environmental Equipment Corporation Wayside wheelchair lift
US4638610A (en) * 1983-03-03 1987-01-27 Elevator Gmbh Theatrical stage
DE8631449U1 (de) * 1986-11-25 1987-02-19 Zapf, Herbert, 8931 Walkertshofen Hebebühne
FR2609975A1 (fr) * 1987-01-23 1988-07-29 Realisa Amandinoises Sarl Et Plate-forme elevatrice repliable
DE9108825U1 (de) * 1991-02-28 1991-11-14 Langewellpott, Ernst, 4992 Espelkamp Scherenhubtisch
EP0560256A1 (fr) * 1992-03-13 1993-09-15 Yukio Kanazawa Plate-forme de support

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499970A (en) * 1982-06-25 1985-02-19 Environmental Equipment Corporation Wayside wheelchair lift
US4638610A (en) * 1983-03-03 1987-01-27 Elevator Gmbh Theatrical stage
DE3315136C1 (de) * 1983-04-27 1984-08-23 Anton Ruthmann Gmbh & Co, 4423 Gescher Scheren-Hubbühne
DE8631449U1 (de) * 1986-11-25 1987-02-19 Zapf, Herbert, 8931 Walkertshofen Hebebühne
FR2609975A1 (fr) * 1987-01-23 1988-07-29 Realisa Amandinoises Sarl Et Plate-forme elevatrice repliable
DE9108825U1 (de) * 1991-02-28 1991-11-14 Langewellpott, Ernst, 4992 Espelkamp Scherenhubtisch
EP0560256A1 (fr) * 1992-03-13 1993-09-15 Yukio Kanazawa Plate-forme de support

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1005221B (el) * 2005-07-01 2006-05-18 Δυσπαραμορφωτος τηλεσκοπικος μηχανισμος
WO2007003971A1 (fr) * 2005-07-01 2007-01-11 Aristides Gogoussis Mécanisme télescopique rigide
WO2023010433A1 (fr) * 2021-08-05 2023-02-09 Terex South Dakota, Inc. Dispositif élévateur

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