NO346113B1

NO346113B1 - Assemblable and dis-assemblable work platform lift

Info

Publication number: NO346113B1
Application number: NO20210128A
Authority: NO
Inventors: Helge Johnsen
Original assignee: Helijo As
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2022-02-28
Also published as: NO20210128A1

Description

ASSEMBLABLE AND DIS-ASSEMBLABLE WORK PLATFORM LIFT

TECHNICAL FIELD

[0001] The present invention relates to work platform lifts used to lift persons and equipment up to a working position for e.g., performing construction or maintenance work on an object, such as a construction. More specifically the invention is related to a modular platform lift that can easily be transported in a disassembled state and assembled on the working site.

BACKGROUND

[0002] When performing construction and maintenance work on various vertical surfaces such as, for example, fences, walls, and sides of buildings, it is often necessary to erect scaffolding to enable workers to stand at an elevation above a floor or the ground.

Conventional scaffolds are expensive and must be disassembled and then reassembled as the work location requires. Thus, conventional scaffolds and are not well suited for use in connection with light exterior work such as house painting, siding, applying weatherstripping to windows, or in cases where the worker is not going to remain in the same place for very long. Furthermore, transporting, assembling, dis-assembling and storing scaffolds takes a significant amount of time that could otherwise be used to perform the actual work.

[0003] EP 1753690 B1 discloses a transportable mast lift. A work platform is raised and lowered on the mast of the lifting system.

[0004] US 5,271,482 A discloses an electric scaffold having a base with a plurality of outrigger members with adjustable feet, wherein the base is affixed to a mast having an electric drive unit thereon capable of raising and lowering the work platform affixed thereto.

[0005] FR 2984292 A1 discloses a platform lift with base, and a telescopic mast. The platform is a trolley that may operate on the ground independently of the mast and base.

[0006] US 2010/0096216 A1 discloses a scaffolding frame that includes at least two vertical support members, and at least two legs for each of the vertical support members that extend outward and away from the vertical support members. A platform is .

[0007] US 6,095,284 A discloses an elevatable stand construction for physically challenged hunters which includes a ladder style main framework supported in an upwardly angled disposition, a chair style platform slidably disposed on the main framework and a mechanized unit for moving the platform up and down.

[0008] EP2949987 A1 discloses a collapsible portable stand comprising support legs and a telescopic mast that collapse into a small equipment enclosure or case, forming one single, integral unit that provides for storage, stable support for a device that is mounted onto the mast, and portability.

[0009] US 4,015,686 A discloses a portable multi-stage lift has a winch-operated reeving system operable from ground level or from the lift carriage. The stages of the lift mast slidingly interfit front to back and each has the same cross-section shaped to be formed of a single extrusion.

[0010] US patent 6779635B1 discloses a mechanism for providing motion and force while maintaining parallelism between a base structure and a movable structure.

[0011] The platform lifts above may be portable but lacks stability and are in general difficult to transport to remote areas where there is no established infrastructure, such as a paved road.

SHORT SUMMARY

[0012] Based on the above-mentioned remaining problems related to prior art, it is thus desirable to provide a new platform lift that is easy to assemble, relocate, disassemble, and transport, even to remote working locations where the lift has to be manually lifted and carried. Preferably, a single person should be able to operate the lift.

[0013] One of the advantages of the current work platform lift is that it is light weight and modular. As an example, a work platform lift with a height of 6 meters will have the weight of approximately 130 kg, the weights not included. This allows easy transportation and even carrying the modular lift by a single person.

[0014] It is particularly desirable to provide such structures that are safe for the user and can be easily adapted to a variety of different working conditions. The new scaffold structure is stable without being secured to a wall (i.e., free-standing) and can be adjusted to provide a level platform for a worker despite changes in the level and grade of the supporting surface. Such scaffold structures are simple in construction and less costly than prior art scaffolds, and assembly and transportation would not require highly skilled users to utilize the scaffold.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Fig. 1 illustrates a left side view of an embodiment the work platform lift according to the invention. The lift is here in an assembled state and the platform (2) has been lifted to the top of its working range.

[0016] Fig. 2 illustrates in a rear view the same embodiment as in Fig. 1.

[0017] Fig. 3, 4, 5, 6 and 7 illustrate in a top view some aspects of the assembly of a work platform lift according to the invention. Fig. 3 illustrates the frame (3) comprising the first and second leg elements (31, 32) laid out horizontally on the ground before and during assembly.

[0018] The left part of Fig. 3 illustrates elements used for assembling the first leg element (31). The middle part illustrates the first and second legs assembled and laid out individually, and the right part illustrates the first and second leg elements interconnected in the common pivot point (320).

[0019] Fig. 4a illustrate in a top view the base (4) assembled on the ground. Fig. 4b illustrates in a left side view how the base is raised up and mounted to the lower part of the frame (3). The binding element is here in a retracted position.

[0020] Fig. 5 illustrates in an animated left view how the assembly comprising the frame (3) and the base is raised from a position where the frame (3) is arranged horizontally on the ground to an upright position where the frame is mainly vertical.

[0021] Fig. 6 and 7 illustrates in a left side view and rear view, respectively the work lift of Fig.1, wherein the platform (2) is arranged in its lowest position.

[0022] Fig. 8 is a detailed view of Fig. 6, illustrating how the first lower holding element (341) is arranged on the first leg element (31) by a matching profile, the first connection point (43a) of the binding element (43) is pivotally fixed to the first lower holding element, e.g. by a through bolt (not seen in this view) and the first end (41a) of the lower base element is pivotally fixed to the first connection point (43a) of the binding element (43).

[0023] Fig. 9 is a detailed view of Fig. 6, illustrating how the second end (41b) of the first base element (41) is pivotally fixed to the connection element (45) and the second end (51b) of the first support element (51) is connected to the connection element (45).

Further, the weight element (44) is arranged on a platform of the connection element.

[0024] Fig. 10 illustrates an embodiment of the work platform lift in a top view.

[0025] Fig. 11 illustrates in a front view, to the right, how the rear wall (23) is mounted on the second platform guide element (34), according to an embodiment of the invention. In a detailed view to the left, it can be seen that an open end of the first rear wall element (231) is pressed in the left direction in order to mount the first guide wheel (34a). The guide wheel is fixed to the guide element on a protruding axle, allowed to move in a slit in the first rear wall element. The upper part of Fig. 11 illustrates in a section view how the second platform guide element (34) is configured to slide up and down the second leg element (32) by wheels arranged between protruding profiles.

[0026] Fig. 12 Illustrates in a section view the work platform lift (1) in a dis-assembled state according to an embodiment of the invention, where all the elements are compacted on the platform floor (234).

[0027] Fig. 13 illustrates how the work platform lift of Fig. 12 can be easily transported by a single person in the dis-assembled state, e.g., on a wheeled frame specifically made for this purpose.

[0028] Fig. 14 and 15 illustrate two additional applications of the work platform lift, wherein Fig. 14 the lift is used for performing work above a staircase. Here the second ends of the first, second and third bottom elements have height adjustable foots in the lower end. Due to low weight the assembled frame and base may be carried by two persons to locations that are otherwise difficult to reach. The platform can be carried separately. A single person may also be able to raise the lift alone by assembling it on-site, as disclosed in this document.

[0029] In Fig. 15 the platform lift is used for any ceiling related work, such as installation of gypsum plates, painting or changing light bulbs.

EMBODIMENTS OF THE INVENTION

[0030] In the following description, various examples and embodiments of the invention are set forth in order to provide the skilled person with a more thorough understanding of the invention. The specific details described in the context of the various embodiments and with reference to the attached drawings are not intended to be construed as limitations. Rather, the scope of the invention is defined in the appended claims.

[0031] The embodiments described below are numbered. In addition, dependent embodiments defined in relation to the numbered embodiments are described. Unless otherwise specified, any embodiment that can be combined with one or more numbered embodiments may also be combined directly with any of the dependent embodiments of the numbered embodiment(s) referred to.

[0032] In a first structural embodiment the invention is a work platform lift (1) comprising;

- a main frame (3) comprising;

- first and second leg elements (31, 32) with respective first and second ends (31a, 31b, 32a, 32b), wherein the first ends (31a, 32a) are interconnected in a common pivot point (320), and

- abinding element (43) with first and second connection points (43a, 43b) respectively connected to the second ends (31b, 32b) of the first and second leg elements, wherein the binding element is extendable and retractable between the first and second connection points (43a, 43b), and wherein the first and second leg elements are configured to pivot with respect to each other and to the binding element when the binding element is extended or retracted.

[0033] In a first dependent embodiment, the binding element comprises any of first and second end stops, preventing the binding element from extending above a maximum extension and from retracting below a minimum retraction, respectively.

[0034] In a second dependent embodiment, the binding element comprises an extension lock configured to lock the binding element in any of the extended position, retracted position or an intermediate position between the extended and retracted positions.

[0035] In a second structural embodiment, that may be combined with the first structural embodiment, the work platform lift (1) comprises;

- a base (4) comprising;

- first and second base elements (41, 42) connected with respective first and second ends (41a, 41b, 42a, 42b), wherein the first and second base elements are connected to the first and second connection points of the binding element or the second ends of the first and second leg elements, respectively, and wherein the second ends of the first and second base elements are pivotally interconnected, wherein the first and second base elements are configured to pivot with respect to each other and to the binding element when the binding element is extended or retracted.

[0036] In a first dependent embodiment, the first ends (41a, 42a) of the first and second base elements are connected to the first and second connection points of the binding element or the second ends of the first and second leg elements, respectively.

[0037] In a second dependent embodiment, first and second base elements are extendable, allowing the first ends of the first and second connection points of the binding element to extend to either side of the frame.

[0038] In a third dependent embodiment, the base comprises a connection element (45), wherein the second ends of the base elements are connected to the connection element.

[0039] In a fourth dependent embodiment, the connection element is configured to hold a weight element (44).

[0040] In a fourth dependent embodiment, a third bottom element (46) with first and second ends (46a, 46b), wherein the first end is connected to the connection element (45).

[0041] Any of the second ends (38b, 39b, 46b) of the first, second or third bottom elements (38, 39, 46) may be equipped with a stable foot or a wheel. Further, any of the first, second or third bottom elements (38, 39, 46) may be adjustable in height.

[0042] In a third structural embodiment, that may be combined with the first or second structural embodiments, the work platform lift (1) comprises;

- a platform (2),

- a platform actuator (6) configured to move the platform vertically along the main frame.

[0043] In a first dependent embodiment the platform actuator comprises first and second wires (61, 62), the first and second leg elements comprise respective first and second pulleys (63, 64) arranged on either side of the common pivot, and the platform comprises first and second wire connections (21, 22), wherein the first and second wires are arranged over the first and second pulleys, and their first ends are connected to the first and second wire connections, respectively.

[0044] In a second dependent embodiment, the platform actuator comprises;

- a winch (65) with first and second reels, wherein the second ends of the first and second wires are connected to the first and second reels, respectively.

[0045] In a third dependent embodiment, the winch is fixed to the frame.

[0046] In a fourth structural embodiment, that may be combined with any of the structural embodiments above, the work platform lift (1) comprises;

- first and second longitudinal support elements (51, 52), wherein a first end of the first and second support elements are connected to the first and second leg elements, respectively, and the second end of the first and second support elements are connected to the first and second base elements, respectively.

[0047] In a dependent embodiment, the first and second longitudinal support elements (51, 52) are extendable, configured to adjust the angle between the frame and the base.

[0048] In a dependent embodiment the first and second longitudinal support elements (51, 52) comprises first and second holding elements (35a, 35b) with a profile corresponding to the profile of the metal profiles that are mounted slidingly from one end of the metal profiles and fixed to the profile, wherein the first ends of the first and second support elements are connected to the first and second holding elements, respectively.

[0049] In a fifth structural embodiment, that may be combined with any of the structural embodiments above, the first and second leg elements comprises;

- first and second longitudinal tubular metal profiles, wherein a second end of the metal profiles correspond to the second ends of the first and second leg elements, and

- first and second top elements (210, 220) configured to be mounted to a first end of the first and second longitudinal metal profile pipes in a second end (36b, 37b),

- wherein the first ends (36a, 37a) of the first and second top elements (36, 37) are joined in the common pivot point.

[0050] In a first dependent embodiment the second ends of the first and second top elements (36, 37) are arranged inside the first ends of the first and second longitudinal metal profile pipes.

[0051] In a second dependent embodiment, the first and second top elements (36, 37) are curved or L-shaped.

[0052] In a third dependent embodiment, the first and second pulleys are fixed to the first and second top elements, respectively.

[0053] In a first method embodiment, the invention is a method for assembling a work platform lift (1), comprising;

- assembling in a horizontal position a main frame (3) comprising longitudinal first and second leg elements (31, 32) with first and second ends (31a, 31b, 32a, 32b), wherein the first ends (31a, 32a) are linked in a common pivot point (320),

- mounting a binding element (43) with first and second connection points (43a, 43b) respectively connected to the second ends (31b, 32b) of the first and second leg elements, wherein the binding element is extendable and retractable between the first and second connection points (43a, 43b), and wherein the first and second leg elements are configured to pivot with respect to each other and to the binding element when the binding element is extended or retracted.

[0054] In a second method embodiment, that may be combined with the first method embodiment, the method comprises;

- assembling a base (4) comprising;

- pivotally interconnecting second ends (41b, 42b) of first and second base elements (41, 42),

- pivotally connecting the first and second base elements to the first and second connection points of the binding element or the second ends of the first and second leg elements, respectively.

[0055] In a first dependent embodiment, the method comprises;

– connecting the first ends (41a, 42a) of the first and second base elements are to the first and second connection points of the binding element or the second ends of the first and second leg elements, respectively.

[0056] In a second dependent embodiment, the first and second base elements are extendable, allowing the first ends of the first and second connection points of the binding element to extend to either side of the frame.

[0057] In a third dependent embodiment, the method comprises;

- connecting a connection element (45) to the second ends of the base elements.

[0058] In a third method embodiment, that may be combined with any of the method embodiments above, the method comprises;

- connecting first ends of first and second longitudinal support elements (51, 52) to the first and second leg elements, respectively,

- connecting second ends of the first and second support elements to the first and second base elements, respectively.

[0059] In a dependent embodiment, the first and second longitudinal support elements (51, 52) are extendable, configured to adjust the angle between the frame and the base.

[0060] In a fourth method embodiment, that may be combined with any of the method embodiments above, the method comprises;

- raising the frame to an upright position by rotating the frame about the second ends of the first and second leg elements,

- extending the binding element to an end position so that the first and second legs lean towards each other.

[0061] In a fourth method embodiment, that may be combined with any of the method embodiments above, the method comprises;

- arranging platform (2) facing the frame opposite the connection element,

- connecting the platform to a platform actuator (6) configured to move the platform vertically along the main frame.

[0062] In a first dependent embodiment the method comprises;

- arranging first and second wires (61, 62), over respective first and second pulleys (63, 64) arranged on either side of the common pivot and connecting the first ends of the first and second wires to first and second wire connections (21, 22) on the platform.

[0063] In a second dependent embodiment, the method comprises;

- mounting a winch (65) with first and second reels wherein the second ends of the first and second wires are connected to the first and second reels, respectively.

[0064] In a third dependent embodiment, the method comprises fixing the winch to the frame.

[0065] In a fifth method embodiment, that may be combined with any of the method embodiments above, the method comprises;

[0066] In a dependent embodiment, the first and second longitudinal support elements (51, 52) are extendable, configured to adjust the angle between the frame and the base.

[0067] In a dependent embodiment the method comprises

- slidingly mounting first and first and second holding elements (35a, 35b) with a profile corresponding to the profile of the metal profiles onto the metal profiles,

- connecting the first ends of the first and second support elements to the first and second holding elements, respectively.

[0068] In a sixth method embodiment, that may be combined with any of the method embodiments above, method comprises;

mounting first and second top elements (210, 220) to a first end of first and second longitudinal metal profile pipes in a second end (36b, 37b),

- joining the first ends (36a, 37a) of the first and second top elements (36, 37) in the common pivot point.

[0069] In a first dependent embodiment the method comprises arranging second ends of the first and second top elements (36, 37) inside the first ends of the first and second longitudinal metal profile pipes.

[0070] In a second dependent embodiment, the first and second top elements (36, 37) are curved or L-shaped.

[0071] In a third dependent embodiment, the method comprises fixing the first and second pulleys to the first and second top elements, respectively.

[0072] A specific embodiment of the invention for assembling a scaffolding device as illustrated by the accompanying drawings, will now be explained.

[0073] In Fig. … it is illustrated that the work platform lift (1) is initially in a disassembled state…. All the elements required to assemble the device can be picked from the container individually and carried manually or by other transport to the working location for assembly.

[0074] Initially, the main frame (3) is assembled on the ground. The first and second leg elements (31, 32) are assembled by joining lengths of tubular metal profiles (330). In this case aluminium profiles are used. The metal profiles are joint by joint elements (301) inserted into the facing ends of the profiles as seen. Similar joint elements are also inserted into the upper and lower ends of the assembled legs.

[0075] First and second platform guide elements (33, 34) are then arranged axially movable on the first and second leg elements. Lateral edges on the leg profiles provide tracks for wheels on opposing sides of the legs, where the guide elements are fixed to the axles of the wheels. This allows the platform guide elements to slide along the length of the legs, while being fixed in the lateral direction.

[0076] First and second holding elements (35a, 35b) with a profile corresponding to the profile of the metal profiles are mounted slidingly from one end of the metal profiles and fixed to the profile by a set-screw on the opposite side of the platform guide elements.

[0077] The first ends (36a, 37a) of the first and second top elements (36, 37) are inserted into the top end of the first and second leg elements (31, 32) and first ends (38a, 39a) of the first and second bottom elements (36, 37) are inserted into the bottom end of the first and second leg elements (31, 32), where the second ends (36b, 37b) of the first and second top elements (36, 37) are pointing towards each other. The joint elements inserted into the top and bottom of the legs have an inner profile that match the profiles of the top and bottom elements, e.g., circular.

[0078] The second ends (38b, 39b) of the bottom elements are equipped with wheels and are adjustable in height.

[0079] The top elements have the shape of an L with an obtuse angle, and when their first end is inserted into the metal profile, the final first and second leg elements will also have the shape of L’s with obtuse angles. The first ends (31a, 32a) of the first and second leg elements (31, 32) correspond to the second ends (36b, 37b) of the first and second ends of the first and second top elements (36, 37). The top elements are ridged.

[0080] Further, the second ends (36b, 37b) of the first and second top elements (36, 37) are interconnected in a common pivot (320), and the straight portions of the first and second leg elements (31, 32) are arranged essentially parallel on the ground.

[0081] The first and second top elements (36, 37) comprises first and second pulleys (63, 64), respectively. The pulleys are arranged close to the first ends (36a, 37a) of the first and second top elements (36, 37). First and second wires (61, 62) are arranged over the respective pulleys.

[0082] First ends (51a, 52a) of first and second support elements (51, 52) are mounted to the respective first and second holding elements (35a, 35b).

[0083] Next, a base (4) is assembled separately from the frame on the ground. The base comprises a telescopic binding element (43) with first and second connection points (43a, 43b), first and second bottom elements (38, 39), each with first and second ends (38a, 38b, 39a, 39b), and a connection element (45). The first ends (38a, 39a) of the first and second bottom elements (38, 39) are pivotally connected to the first and second connection points (43a, 43b) of the binding element, respectively, and the second ends (38b, 39b) of the first and second bottom elements (38, 39) are pivotally connected to the connection element (45). The finished base has the shape of an isosceles triangle.

[0084] The assembled frame is then rotated upright with the binding element standing on the frame in its retracted position, and the first and second connection points (43a, 43b) of the binding element (43) are fixed to the second ends (31b, 32b) of the first and second leg elements (31, 32), respectively.

[0085] Further, the second ends (51b, 52b) of the first and second support elements (51, 52) are connected to the connection element (54).

[0086] From the horizontal position, the assembled frame and base is now raised up in a rotational movement about the second ends of the first and second leg elements (31, 32). This can be performed in the same way as raising a ladder. By gripping the top of the frame, i.e., in the area of the first and second top elements, one person can take advantage of the large torque from the end position. The frame can be seen as a lever for this purpose. As the frame is raised, the force required to further rotate the frame decreases, and it is sufficient for the person to hold on to one of the legs with each hand. Since the binding element is in its retracted position the legs are essentially parallel, or close to each other at this stage, and the frame can be fully controlled from start to end of the rotational movement.

[0087] The raising of the frame continues until the rotation is stopped by the base hitting the ground. Due to the weight of the base, the frame and base combination can be left standing without additional support.

[0088] While in the raised position, the binding element (43) is extended and fixed in its extended position. Since the first and second legs are ridgid from their first ends to their second ends, i.e., from the wheels spread apart in the length of the binding element to the common pivot, the frame becomes very stable in the sideways direction, and can be treated as an imaginary isosceles triangle for the consideration of strength and stability.

[0089] The second ends of the first and second leg elements and the connection element comprises height adjustable extension legs with wheels. The extension legs are adjusted so that the base triangle is horizontal.

[0090] In order to further stabilize the structure before the platform is mounted, a weight element (44) is arranged on top of the connection element (45).

[0091] A winch (65) is arranged fixed to the middle of the binding element and first ends of the first and second wires (61, 62) are arranged and fixed to first and second reels of the winch.

[0092] The first and second platform guide elements (33, 34) each comprise first guide wheels (33a, 34a) arranged on wheel axes protruding perpendicular to the leg elements.

[0093] A rear wall (23) of the platform (2) comprising interconnected first and second tubular longitudinal rear wall elements (231, 232) are mounted to the first and second platform guide elements (33, 34). The first rear wall element comprises a longitudinal slit, allowing it to be laterally locked to the guide wheels. A first end of the first rear wall element is longitudinally moved towards and over the guide wheels on one of the platform guide elements, and then back in the opposite direction over the guide wheel on the other of the platform guide elements. The rear wall is now secured to the guide elements in the lateral direction but allowed to move sideways relative to the each of the guide elements. Next, first and second side walls (236, 237), a platform floor (234) and a front wall (235) are mounted to the rear wall to secure the working space of a person inside the platform.

[0094] The assembled platform is arranged with its rear wall (23) facing the first and second leg elements (31, 32) opposite the connection element (45), and the first and second wires (61, 62) are fixed to the first and second wire connections (21, 22) of the rear wall.

[0095] The platform is now ready to be lifted and lowered by operating the winch (65).

[0096] The work platform lift (1) may be dis-assembled by performing the steps above in the opposite direction.

[0097] In the exemplary embodiments, various features and details are shown in combination. The fact that several features are described with respect to a particular example should not be construed as implying that those features by necessity have to be included together in all embodiments of the invention. Conversely, features that are described with reference to different embodiments should not be construed as mutually exclusive. As those with skill in the art will readily understand, embodiments that incorporate any subset of features described herein and that are not expressly interdependent have been contemplated by the inventor and are part of the intended disclosure. However, explicit description of all such embodiments would not contribute to the understanding of the principles of the invention, and consequently some permutations of features have been omitted for the sake of simplicity or brevity.

Claims

1. A work platform lift (1) comprising;

- a main frame (3) comprising;

- first and second leg elements (31, 32) with respective first and second ends (31a, 31b, 32a, 32b), characterized in that the first ends (31a, 32a) are interconnected in a common pivot point (320), and

- a binding element (43) with first and second connection points (43a, 43b) respectively connected to the second ends (31b, 32b) of the first and second leg elements, wherein the binding element is extendable and retractable between the first and second connection points (43a, 43b), and wherein the first and second leg elements are configured to pivot with respect to each other and to the binding element when the binding element is extended or retracted.

2. The work platform lift of claim 1, comprising;

- a base (4) comprising;

- first and second base elements (41, 42) with respective first and second ends (41a, 41b, 42a, 42b), wherein the first and second base elements are connected to the first and second connection points of the binding element or the second ends of the first and second leg elements, respectively, and wherein the second ends of the first and second base elements are pivotally interconnected, wherein the first and second base elements are configured to pivot with respect to each other and to the binding element when the binding element is extended or retracted.

3. The work platform lift of claim 1 or 2, comprising;

- a platform (2),

4. The work platform lift of claim 3, wherein the platform actuator comprises first and second wires (61, 62), the first and second leg elements comprise respective first and second pulleys (63, 64) arranged on either side of the common pivot, and the platform comprises first and second wire connections (21, 22), wherein the first and second wires are arranged over the first and second pulleys, and their first ends are connected to the first and second wire connections, respectively.

5. The work platform lift of any of claims 2 to 4, wherein the work platform lift (1) comprises;

6. A method for assembling a work platform lift (1), comprising;

- assembling in a horizontal position a main frame (3) comprising longitudinal first and second leg elements (31, 32) with first and second ends (31a, 31b, 32a, 32b), wherein method is characterized in that the first ends (31a, 32a) are linked in a common pivot point (320), and that the method further comprises;

7. The method of claim 6, comprising;

- assembling a base (4) by;

- pivotally connecting the first and second base elements to the first and second ends of the binding element or the second ends of the first and second leg elements, respectively.

8. The method of claim 6 or 7, comprising;

9. The method of any of claims 6 to 8, comprising;

- extending the binding element to an end position so that the first and second leg elements lean towards each other.

10. The method of any of claims 8 to 9, comprising;

- arranging a platform (2) facing the frame opposite a connection element (45) pivotally interconnecting the first and second base elements (41, 42),

- connecting the platform to a platform actuator (6) configured to move the platform vertically along the main frame,