EP2436641B1 - Telescopic working platform - Google Patents

Description

The invention relates to a telescopic working platform with a hydraulically raised and lowered working platform, an extendable telescopic linkage comprising a plurality of telescopically movable rod elements for supporting and guiding a movement of the work platform in a longitudinal direction of the telescopic linkage, and a plurality of hydraulic cylinders for moving the rod elements of the telescopic linkage relative to each other. Such a device is in document US 4 575 976 ,

An aerial work platform is for example from the German utility model DE 298 06 602 U1 known. This comprises a telescopic boom for aerial work platforms with a plurality of mutually displaceably arranged telescopic beams, the outer telescopic support for receiving and guiding the inner telescoping carrier and at least three of the inner telescoping carrier coupled together and are displaceable and form a Teleskopträgergruppe, wherein at least the innermost two telescoping carrier over at least two Chain or cables are connected together. A displacement of the telescopic carrier is thus purely mechanical with chain and cable pulls. These generally have the disadvantage that they have a high maintenance due to a large number of movable and heavily loaded components. In addition to the maintenance costs, this also increases the probability of failure of the entire system.

Furthermore, in the Swiss patent specification CH 394 550 a hydraulic lifting and lowering telescopic lift for loads described with at least two hollow piston, of which an inner in the outer and the latter is displaceable in a vertically disposed cylinder. The device described So includes a multi-stage hydraulic lifting cylinder, which can be extended and retracted telescopically. Here, hydraulic fluid is introduced directly inside the lift cylinder under pressure. The lifting cylinder thus represents one of a large number of individual components existing arrangement, which must be formed pressure-tight beyond. In particular, the sealing of the moving and at the same weight-loaded components to each other and a maintenance of the entire lifting cylinder designed here to be particularly complex and therefore expensive and prone to failure.

The Utility Model DE 85 34 229 U1 describes a self-propelled lift with a mobile base with two front and rear wheels and an upwardly extendable lifting element on the base and connected to the lifting platform working platform. Also known as the lifting element extendable lifting cylinder is hydraulically extendable and includes several stages, so that also give the difficulties mentioned in terms of a seal and a maintenance or wear of moving and at the same time heavily weighted components.

Furthermore, jump systems are known from the prior art, such as from the German utility model DE 201 06 398 U1 , These include a support linkage for a jump system comprising a plurality of obliquely upwardly projecting cantilever arms, at the free ends of each two elastic ropes are attached, the cables of two adjacent cantilever arms are attached to a support device for a user such that the user with the aid of Upwardly elastic cables can jump preferably with the aid of a jump aid device between each two adjacent boom arms.

The described arrangement has the disadvantage that in order to fasten the user, the respective jump ropes must first be lengthened in order to be fastened to the user in a relaxed state. Subsequently, the jump ropes must be shortened again for the operation of the system to a precisely defined length and thus stretched. To disconnect the user from the system, repeat this procedure in reverse order. If several users can use the system at the same time, the above-mentioned steps must be repeated for each individual user. The ever-repeated lengthening and shortening of the skipping ropes to secure the users loads the ropes in addition to the constant elastic deformations when jumping users so strong that they must be replaced early. There is therefore a regular cost for the early replacement of the ropes for this jump system. Furthermore, the operation and the tensioning of the individual cables require a considerable amount of time, resulting in an unused operating time of the jump system.

It is therefore an object of the invention to provide a Teleskophbbhne, which avoids the above disadvantages or at least reduced and inexpensive and easy to manufacture and easy to handle and use.

The object is achieved with a telescopic working platform according to claim 1. Accordingly, a Teleskububarbeitsbühne with a hydraulically raised and lowered work platform, an extendable telescopic linkage, which a plurality of telescopically movable rod elements for supporting and guiding a movement of the working platform in a longitudinal direction of the telescopic linkage and a Includes a plurality of hydraulic cylinders for moving the rod elements of the telescopic linkage relative to each other. The hydraulic cylinders are arranged outside the telescopic linkage and each have a stroke direction of the hydraulic cylinder in the direction of the longitudinal direction of the telescopic linkage. Furthermore, the lifting cylinders are connected in series such that each hydraulic cylinder has a hydraulic connection to a subsequently arranged hydraulic cylinder.

The work platform can therefore be raised and lowered again by means of the extendable telescopic linkage. For this purpose, the rod elements of the telescopic linkage are movable into one another, so that a first rod element for receiving a subsequent second rod element is formed in the interior of the first rod element and the second rod element can be displaced into the first rod element. Accordingly, the second rod element for receiving the third rod element is designed accordingly. This row can be continued arbitrarily up to a last rod element. This is connected to the working platform at an outer end and carries it.

According to the invention, the telescopic rod itself does not have its own hydraulic pressure system in the interior of its rod elements. This offers the advantage that no extensive sealing of the mutually movable parts must be provided. The telescopic linkage is rather intended for supporting and guiding the work platform during a lifting and lowering movement of the telescopic linkage.

A drive of the telescopic linkage takes place exclusively via the above-described plurality of hydraulic cylinders. These are arranged outside the telescopic linkage. This means that the hydraulic cylinders are mounted on a respective outside and not inside the telescopic linkage. This makes them particularly accessible and easy to maintain. In addition, they do not need to be adapted to a cross section of the telescopic boom and sealed complex. Rather, it is thus possible to use suitably dimensioned generally available hydraulic cylinder. The respective hydraulic cylinder is fastened to both of them for moving a rod element with respect to another rod element. In this case, the one rod element can be arranged directly adjacent to the other rod element and be telescopically displaceable relative thereto. Likewise, one or more rod elements can be telescopically interposed, so that the hydraulic cylinder is fixed, for example, to a first and a next but one third rod element. In this case, depending on the range of motion in a method, both the third with respect to the first and the second with respect to the first and third rod element is moved.

The individual hydraulic cylinders are in this case coupled together in a common hydraulic series circuit in such a way that hydraulic fluid is first introduced into a first hydraulic cylinder and flows through it as far as an outlet. The outlet of the first hydraulic cylinder is in turn connected to an inlet of a second hydraulic cylinder. Its outlet has a hydraulic connection with the input of a subsequent third hydraulic cylinder. This series arrangement can be formed with any number of hydraulic cylinders, wherein the last hydraulic cylinder has only one inlet for introducing the hydraulic fluid, but does not comprise an outlet and thus closes off the hydraulic line through the individual hydraulic cylinders.

If now hydraulic fluid is introduced into the first hydraulic cylinder, then this flows through the subsequently arranged hydraulic cylinder into the last hydraulic cylinder. Since the fluid can not escape from this hydraulic line, a pressure builds up along this line, which ensures an actuation or an extension of the respective hydraulic cylinder.

Accordingly, a reduction in the pressure in the entire hydraulic line leads to retraction of the hydraulic cylinder. In order to limit, for example, a total lifting height of the telescopic linkage, in each case the output of a hydraulic cylinder can be closed. This makes this hydraulic cylinder the last hydraulic cylinder in the series. Subsequent arranged hydraulic cylinders are no longer supplied with hydraulic fluid and thus can not be moved.

Preferably, due to this series connection can be dispensed with a direct fluid supply for each individual hydraulic cylinder in the form of a parallel connection with a direct connection to a hydraulic pump, so that the cost of laying appropriate supply lines is simplified. Also preferably, the hydraulic cylinders are hydraulically connected to each other by means of rigid or rigid tubes.

The rigid pipes are designed, for example, as metal or plastic pipes and designed to be stiff in contrast to flexible hoses. This reduces their susceptibility to damage.

Hydraulic hose lines in piping areas with increased requirements, such as holding a load, must be against Be secured line break. Hydraulic fuses such as load-holding valves, pilot operated check valves or blocking blocks are not required for rigid pipe connections. The use of rigid pipe connections instead of flexible hoses thus reduces manufacturing costs and maintenance.

According to one embodiment, the bar elements each have a square or rectangular cross section.

By means of the selected cross-sections can be provided on the respective outer side planar surfaces for easy attachment of the hydraulic cylinder. In addition, the angular configuration of the cross sections prevents rotation of the individual movable bar elements to each other. Of course, however, other cross-sectional shapes are possible, such as a circular, oval or polygonal cross-section.

According to a further embodiment, the extendable telescopic rod is arranged at least in an operating state with a lower end perpendicular to a pedestal.

Thus, the telescopic linkage is at a lower end vertically on a support frame supporting the telescopic platform as a pedestal, wherein the working platform is disposed at the upper end of the telescopic linkage, so that the telescopic linkage and the working platform are arranged substantially T-shaped.

Consequently, in a maximum retracted state where all the bar elements are interlocked as much as possible, the telescopic rod defines the minimum height of the work platform. This means that the telescopic linkage can not be pushed further into each other and the working platform can not be lowered any further. Preferably, in this case, the height of the work platform is approximately between 1.90 m and 3.00 m with respect to a subsurface. The work platform can then be easily reached via a ladder, for example.

According to one embodiment, the telescopic rod can be tilted at least in this maximum retracted position in a tilted transport position or even completely horizontally stored. It can be provided for this purpose to design the working platform with respect to the telescopic linkage hinged for a simple and compact transport.

According to another embodiment, the extendable telescopic rod is connected to an upper end in the center of gravity of the working platform with this. This arrangement makes it possible to keep the lever forces acting on the telescopic linkage due to weight forces of the work platform as low as possible.

Furthermore, the work platform may include at least one boom for attaching loads.

Accordingly, at least one extension arm may extend away from the work platform. Preferably, this extends in the horizontal direction. But it is also possible an obliquely upwards inclined orientation. At an outer end of the cantilever arm, a load can be attached. The working platform preferably has at least two extension arms, which essentially have a spread to one another in the direction of their outer ends. In this case, a load can be attached to both cantilevers individually or together. Furthermore, a use of the above telescopic platform as a jumping device with elastic jump ropes for elastic connection of a user with at least one cantilever arm of the telescopic platform is proposed. Accordingly, an elastic cable for the elastic fastening of loads and / or persons is arranged on the at least one extension arm of the work platform. Preferably, in this case, a so-called bungee cord with adapted length is used. A person secured with the rope can thus jump from the work platform into the depth when the work platform is at a previously defined jump height. For this purpose, the working platform preferably has at least two cantilever arms extending apart from one another from the working platform. At the outer ends of each of the elastic ropes is attached, each with an upper end. At an opposite lower end of the ropes a so-called jump harness for the user is attached, which usually consists of safety straps. Preferably, the lower ends of the two ropes are attached to the left and right of the user to the jump harness.

According to a further embodiment, the telescopic working platform has a mobile substructure. With its help, the telescopic working platform can be made mobile, to make this easily transportable. The mobile substructure is provided in this case as described above as a pedestal for the telescopic working platform.

According to a further embodiment of the mobile substructure is designed as a car trailer. This allows a particularly easy transport, as no additional driver's license to move the telescopic platform or heavy Transport device, for example in the form of a low loader is needed. Also, the car trailer is not affected by any truck driving ban and can also be used in narrow road conditions.

Furthermore, the mobile pedestal may include its own drive with a remote control for remotely moving the mobile pedestal.

This is particularly important for parking the telescopic platform mounted on the mobile substructure. The mobile substructure can be easily moved to its destination by means of the remote control and its own drive, for example, after disconnecting from a towing car. A power-consuming pushing the mobile substructure can thus be omitted. As a remote control both wired input devices and input devices with a radio connection come into consideration.

Furthermore, the mobile substructure may include an off-road tire for moving the mobile substructure away from paved roads. Under a terrain tires in particular wheels with grippy profile and / or suitable large diameter are to be understood.

This allows in particular a method of the car trailer in rough terrain, for example on a meadow when the car trailer with the telescopic platform is to be parked on this.

According to another embodiment, the work platform comprises lighting means for illuminating an environment. Thus suitable The described telescopic work platform as light poles for lighting places.

Preferably, the telescopic platform is designed as a load carrier and has a load capacity of up to 1000kg. Also preferably, the lifting height of the working platform is infinitely adjustable between 3m and 10m.

Fig. 1

eine erfindungsgemäße Teleskophubarbeitsbühne in ei-ner ersten Seitenansicht,

Fig. 2

die Teleskophubarbeitsbühne gemäß Figur 1 in einer weiteren Seitenansicht,

Fig. 3

die erfindungsgemäße Teleskophubarbeitsbühne in einem eingefahrenen Zustand in seitlicher Ansicht,

Fig. 4

einen Schnitt durch das ausfahrbare Teleskopgestänge der erfindungsgemäßen Teleskophubarbeitsbühne und

Fig. 5

eine schematische Darstellung eines Funktionsprinzips der in Reihe geschalteten Hydraulikzylinder der er-findungsgemäßen Teleskophubarbeitsbühne.

The object of the invention is explained in more detail with reference to the embodiment shown in the following figures. This shows

Fig. 1

a telescopic working platform according to the invention in a first side view,

Fig. 2

the telescopic work platform according to FIG. 1 in a further side view,

Fig. 3

the telescopic working platform according to the invention in a retracted state in a lateral view,

Fig. 4

a section through the extendable telescopic linkage of the telescopic working platform according to the invention and

Fig. 5

a schematic representation of a functional principle of the series-connected hydraulic cylinder of the inventive telescopic working platform.

FIG. 1 shows a side view of the telescopic working platform 1 according to the invention in an extended state. This has a mobile base as a pedestal, consisting of a trolley 10 with vehicle wheels 11 and extendable supports 12 (shown in non-extended state) and a Drawbar 13 is. Of the trolley 10 extends in the vertical direction, a telescopic linkage 30, which consists of four rod elements 31, 32, 33, 34. At an upper end of the uppermost rod element 34, a working platform 20 is arranged with a railing 21 for securing. The four rod elements 31, 32, 33, 34 of the extendable telescopic rod 30 are telescopically movable into each other and provided for supporting and guiding a movement of the working platform 20. For moving the rod elements of the telescopic linkage 30 relative to one another, hydraulic cylinders 35, 36 and 37 (in FIG FIG. 1 covered). Each hydraulic cylinder has a lifting cylinder and a piston rod movable relative thereto. The first hydraulic cylinder 35 is fastened with its lifting cylinder on the first rod element 31 and with the extendable piston rod on the second rod element 32. Upon actuation of the hydraulic cylinder 35, the piston rod extends and moves the second rod member 32 with respect to the first rod member 31 in a vertical upward direction. According to the illustrated embodiment, the second hydraulic cylinder 36 is fixed to an upper end of the second rod member 32 with its lift cylinder. A movable piston rod of the second hydraulic cylinder 36 is supported on an upper end of the third rod element 33 in order to move it when the piston rod of the second hydraulic cylinder 36 extends or retracts with respect to the second rod element 32.

The same applies to the third hydraulic cylinder 37, which in the view in FIG. 2 is shown and attached to an upper end of the third rod member 33 and can be supported at an upper end of the fourth rod member 34 for moving the fourth rod member 34 with respect to the third rod member 33. According to the illustrated alternative embodiment For this purpose, the third hydraulic cylinder 37 is supported on an upper end of the second rod element 32.

FIG. 2 shows a front view of in FIG. 1 described telescopic working platform 1 also in the extended position already described, so to the description FIG. 1 can be referenced.

FIG. 3 shows the telescopic working platform 1 according to the invention in a retracted state in which the telescopic working platform 1 is ready for transport. Here, the supports 12 are shown in the retracted state, so that trained as a trailer mobile undercarriage can be attached by means of the drawbar 13 to a towing car. The four rod elements 31, 32, 33, 34 of the telescopic rod 30 are inserted as far as possible into each other in the illustrated state. For example, for this retracted position, a ladder for climbing the work platform 20 may be provided (not shown).

FIG. 4 shows a cross section through the in FIG. 3 In telescoping frame 30 shown in the maximum retracted state. Accordingly, the rod elements 31, 32, 33 and 34 are designed as square hollow sections. This means that they have a substantially square cross-section and in each case a longitudinally continuous recess with likewise square cross-section, wherein the inner recess is adapted in size to the respective rod element to be received therein.

FIG. 5 shows a schematic representation of the series-connected hydraulic cylinders 35, 36, 37. These each have a lifting cylinder and a relative thereto movable piston rod 35a, 36a and 37a. A supply of hydraulic fluid via a first input 35b in the first hydraulic cylinder 35. Its lifting cylinder and piston rod 35a are hollow, so that the hydraulic fluid can be passed to an output 35c at the upper end of the piston rod 35a. From there, the hydraulic fluid is conducted via a connection 50 to the second hydraulic cylinder 36. There it is introduced via an input 36b in the likewise hollow running hydraulic cylinder 36 and also exits at an upper end of the piston rod 36a, to be passed from there via a connection 51 to an input 37b of the third hydraulic cylinder 37. The third hydraulic cylinder 37 also has a piston rod 37a, which, however, is not hollow in the illustrated embodiment and has no outlet for discharging the hydraulic fluid. Optionally, in each case a throttle 52 or 53 may be provided for controlling a flow of the hydraulic fluid in the connections 50, 51. By means of these throttles, it is possible to exclude the respective subsequent hydraulic cylinder from a supply of hydraulic fluid. The following hydraulic cylinders are thus no longer supplied with hydraulic fluid and accordingly no longer moved. They remain in their current position. As a pressure supply for providing a pressurized hydraulic fluid, a hydraulic pump 54 may be provided. This can be operated electrically, for example, wherein an electrical voltage used for this purpose, for example via additional arranged on the mobile substructure batteries or a network connection (not shown) can be provided.

LIST OF REFERENCE NUMBERS

1

Telescopic access platform

10

Dolly

11

vehicle wheels

12

Support

13

shaft

20

working platform

21

railing

30

telescopic boom

31 - 34

rod elements

35 - 37

hydraulic cylinders

35a, 36a, 37a

piston rod

35b, 36b, 37b

entrance

35c, 36c, 37c

output

50, 51

Hydraulic connection

52, 53

throttle

54

hydraulic pump

Claims (7)

1. Telescopic aerial work platform comprising

   - a hydraulically liftable and lowerable working platform (20),

   - an extensible telescopic rod assembly (30) comprising a plurality of rod elements (31, 32, 33, 34) which can be moved telescopically into one another, for supporting and guiding a movement of the work platform (20) in a longitudinal direction of the telescopic rod assembly (30),

   - a plurality of hydraulic cylinders (35, 36, 37) for moving the rod elements (31, 32, 33, 34) of the telescopic rod assembly (30) relative to one another,

   the hydraulic cylinders (35, 36, 37) being arranged outside the telescopic rod assembly (30) and a respective stroke direction of the hydraulic cylinders (35, 36, 37) being directed in the direction of the longitudinal direction of the telescopic rod assembly (30), characterised in that the hydraulic cylinders (35, 36, 37) are connected in series such that each hydraulic cylinder (35, 36, 37) has a hydraulic connection (50, 51) to a subsequently arranged hydraulic cylinder (35, 36, 37), in that the extensible telescopic rod assembly (30) is connected at an upper end to the work platform (20) in the centre of gravity of said work platform (20), in that the work platform (20) comprises at least one cantilever arm with a resilient rope for resiliently securing loads and/or persons, the telescopic aerial work platform (1) being mounted on a mobile car trailer.
2. Telescopic aerial work platform according to claim 1, characterised in that the hydraulic connection (50, 51) is a rigid pipe connection.
3. Telescopic aerial work platform according to either claim 1 or claim 2, characterised in that the rod elements (31, 32, 33, 34) each have a square or rectangular cross section.
4. Telescopic aerial work platform according to either claim 1 or claim 3, characterised in that the extensible telescopic rod assembly (30) is arranged with a lower end vertically on a base at least in one operating state.
5. Telescopic aerial work platform according to claim 1, characterised in that the mobile sub-frame comprises its own drive with a remote control means for the remote-controlled movement of the mobile sub-frame.
6. Telescopic aerial work platform according to either claim 1 or claim 5, characterised in that the mobile base comprises off-road tyres for moving the mobile base off paved roads.
7. Telescopic aerial work platform according to any one of claims 1 to 6, characterised in that the work platform (20) comprises lighting means for illuminating a surrounding area.

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