EP0507906B1 - Erection scaffolding with lifting tackle - Google Patents

Abstract

Box-type erection scaffolding with a platform lift, the height of which can be steplessly adjusted by hoisting tackle along supports arranged upright on a frame, said hoisting tackle comprising a cable winding device arranged on the platform lift for the synchronous winding and unwinding of hoisting cables or similar, whereby two hoisting cables are joined to form one and taken over a shared cable drum. The hoisting cables (10) are taken from the cable drum (17) over a first deflection roller (18) arranged on the platform lift (2), over a second deflection roller (20) arranged at the upper end (19) of the relevant support (5), over a third deflection roller (21) fitted on the platform lift (2), over a fourth such roller (22) again fitted at the upper end (19) of the relevant support (5), over a fifth (24) at the lower end (23) of the relevant support (5) or on the frame (1), superficially diagonally to a transverse side (11) along the erection scaffolding over a sixth deflection roller (25) arranged on the platform lift (2) in the region of the neighbouring support (5') and superficially diagonally to a longitudinal side along the erection scaffolding to the anchor point at the lower end (23) of the support (5'') alongside support (5') or on the frame (1).

Description

The invention relates to a box-shaped assembly scaffold with a lifting platform, which is longitudinally upright on supports arranged on a frame and is continuously height-adjustable, which comprise a cable winding device arranged on the lifting platform for synchronous winding and unwinding of lifting cables or the like, two lifting cables in each case common rope are connected to each other and guided over a common rope drum.

Such a mounting frame is known from EP-A-0 219 883. With this assembly scaffold, which has already proven itself extremely well in practice, a high degree of stability is achieved at any height of the lift with relatively little design effort, the lift being "rigidly" connected to the chassis at any height. This known assembly scaffold has the additional advantage of a light construction due to the use of a cable construction. On the other hand, the height adjustment of the assembly scaffolding requires a certain effort, due to the special cable guide although due to the pulley effect achieved, this well-known lifting platform can be adjusted very easily with relatively low drive power at high loads. Finally, it has been found in practice that the transport of this assembly scaffold, for example when changing the place of use, is relatively cumbersome. Accordingly, the frame with the supports arranged thereon for the transport and the lifting platform are to be transferred to or from the loading platform of a transporter or the like each time, securing the assembly scaffold against slipping during transport by additional, often time-consuming measures is indispensable.

Starting from the assembly scaffold according to EP-A-0 219 883 B1, the object of the invention is to further develop the known device in such a way that, while maintaining high stability and lightweight construction, improved handling for the height adjustment of the lifting platform and the transport of the assembly scaffold as a whole achieved and at the same time operational and functional safety is increased.

This object is achieved by the features specified in the claims, in particular in claims 1, 3, 7, 19, 22, 27, 31, 40, 45 and 56.

Improved handling for the height adjustment of the lift can be achieved by the characterizing features of claim 1 according to the invention, the meaning of this proposal lies in the cable routing of the individual lifting cables described. The multiple deflection according to the invention of the individual hoisting ropes on each support results in a pulley effect, as a result of which the height of the lifting platform can be easily changed even under high loads. This is all the more so since in the construction according to the invention a total of three rope sections of each lifting rope pull up and two rope sections down. As a result, an even distribution of force on each individual support and thus a favorable introduction of force as a whole can be achieved. The diagonally extending hoisting ropes according to the measure according to claim 2 form a for the mounting frame additional stabilization and at the same time prevent access to the assembly scaffolding under the lift.

The measures according to claims 3 to 18 lead to a cable drum for the assembly scaffold according to the invention, and also independently of the measures according to claims 1 and 2, which works particularly efficiently and above all functionally reliable. According to the invention, the cable drum is arranged approximately parallel to the transverse or longitudinal sides of the mounting frame and is equipped with two roller bodies which can be driven by a continuous shaft and each take up two lifting cables connected to one another to form a common cable. This results in a synchronous and uniform winding and unwinding of the hoisting ropes over the entire height adjustment range of the lift. The arrangement of a drive between the two roller bodies of the cable drum according to the features of claim 6 has the advantage of a direct, moreover uniform application of force, which ultimately results in an improved drive performance. Of great importance for a functionally reliable winding and unwinding of the lifting ropes on the rope drum or on its two roller bodies are the measures according to claims 7 to 19. On the one hand, each roller body is provided on the outer circumference with receiving grooves for the lifting rope windings, so that the lifting ropes or The ropes, which are connected to each other by two lifting ropes, are arranged and are immovably received by the corresponding roller body. On the other hand, each roller body is surrounded by an axially movable pressure shell for the hoisting ropes, so that jumping out or the like. Individual hoisting rope windings are prevented from the corresponding receiving grooves of the roller bodies. Even in the event that the lifting ropes are not loaded at all, such as during transportation of the mounting frame, the lifting ropes remain securely in the receiving grooves of the roller body. Structural details with regard to the guide element according to the invention, which causes the pressure shell to move axially as a function of the rotational position of the cable drum or the corresponding roller body, are described in claims 8 to 12. Constructive configurations with regard to the pressure elements of the invention respective pressure shell, which constantly exert a radial pressure in the direction of the roller bodies on the hoisting ropes, preferably in the area of the first hoisting rope winding, and at the same time are moved axially back and forth almost smoothly as a result of the axial movement of the respective pressure shell forced by the guide element, are in claims 13 to 17. To simplify handling during assembly or maintenance, the pressure shell is designed in a longitudinally divided manner.

The design of the supports according to the invention as polygonal profiles, in particular as square profile tubes, according to claims 19 and 20 is of considerable importance for the stability of the assembly scaffold as a result of possible self-torsion of the supports resulting in low torsion under high loads and a raised lifting platform and thus Instability can be largely suppressed. Instead of polygonal profiled tubes, equivalent bar profiles can also be used as supports, e.g. with regard to torsional and buckling stiffness, e.g. I-profile bars or the like., Are used.

The inventive adaptation of the diameter of the pulleys to the width of the supports according to the feature of claim 21 has the advantage that the lifting cables are guided in close proximity to the supports without directly touching them. As a result, an extremely compact construction of the support with associated hoisting rope is achieved, while largely avoiding additional torsional forces or moments of force acting on the respective support. A particularly favorable distribution of the forces, which are caused on the one hand by the dead weight of the lifting platform and on the other hand by further weight loads due to personnel and auxiliary equipment or the like being raised or lowered, within the assembly scaffolding on the individual supports can also be achieved by the arrangement according to the invention of the individual deflection rollers to each other and this on the individual components of the entire assembly scaffold according to the measures of claims 22 to 26. Of particular importance for such a balanced balance of forces within the assembly scaffold according to the invention is the rotary mounting of the axis of rotation of the sixth deflecting roller, since this enables the surface-diagonally extending cable sections of the lifting cables to be adapted to the respective height adjustment of the lifting platform. Overall, in the construction according to the invention always three corner supports of the assembly scaffold cooperate, which in turn are in engagement with the respective adjacent three corner support supports of the assembly scaffold, etc. Forces or moments of force that occur as a result are not one individual support, but rather from all four supports of the assembly scaffold in cooperation. In this way, on the one hand, the stability of the assembly scaffold can be increased even further, and on the other hand, the effort involved in handling this assembly scaffold during height adjustment can be significantly reduced.

By means of the measures of claims 27 to 30, both the guiding accuracy and the smooth operation of the lifting platform when it is displaced along the respective support are further improved with little design effort. Since this design also prevents the lift from tilting on one or more of the supports from the outset, its overall height adjustment is extremely smooth even with one-sided loading.

Furthermore, the operational safety of the assembly scaffold according to the invention is increased in that the lifting platform is provided with braking devices in accordance with the features according to claims 31 to 39, regardless of the measures according to the preceding claims. Since, in the context of the invention, each support is assigned a braking device which automatically and immediately triggers when the corresponding hoisting rope breaks, the lifting platform can be kept at the current height at any time. The structural details according to the invention, in particular by the coupling of the spring-loaded brake shoes with the lifting cable guided over the so-called first deflection pulley, ensure that the brake shoes when the hoist rope breaks, ie when the rope tension ceases, due to the counteracting spring force and last but not least due to the weight of the lift, they reliably engage with the respective support.

In an alternative embodiment to the supports proposed in EP-A-0 219 883 B1, which are hinged to the frame and can be folded into the plane thereof for transport purposes, the frame is provided with support sections in accordance with the features of claims 56 to 64 , the upper ends of which are each connected to the lower end of each support via a hinged joint or the like. Each functionally hinged support hinged to the corresponding support section can be locked without play in the extension of the support section and can be folded into the plane of the frame for transportation purposes just as quickly as after releasing the lock. The structural measures for the folding joint according to the invention, by means of which play-free locking of the respective support on the assigned support section is ensured, are of great importance for a functionally reliable assembly scaffold. Last but not least, this leads to increased safety for the personnel moving on the lifting platform of the assembly scaffold, in particular during vertical movements of the lifting platform, but also in its raised position. In addition, the supports according to the invention, according to a further alternative embodiment, can be inserted into tubular holding devices of the frame in accordance with the measures according to claims 40 to 44 and can be removed from them for transport purposes. In terms of device technology, the mechanism according to the invention for releasing the press fit between the respective support and tubular receiving device is of particular interest. Because of the eccentric provided, the respective support with its tapered end is simply and quickly pressed out of the tubular receiving device or out of the mast quiver when it is rotated by means of a dismantling lever. In this way, the assembly scaffold according to the invention can both be assembled without difficulty and, in turn, conveniently dismantled to form a compact transport unit.

Finally, it is still within the scope of the invention in accordance with the features of claims 45 to 55, regardless of the measures according to the preceding claims, to design or convert the assembly scaffolding according to the invention into a single-axle trailer quickly and without any major conversion effort. The transport of the assembly scaffold according to the invention from one to the subsequent place of use is considerably simplified since there is no need for additional loading or unloading as well as securing the assembly scaffold on the loading platform of a transport vehicle or the like, which takes a lot of time, to prevent it from slipping. Accordingly, a preferably single-axle trailer undercarriage can be moved under the assembly scaffold and captively coupled to it by means of locks according to the invention. In addition, according to the invention, support feet are provided in the corner regions of the frame, which are designed to be extendable downwards at least beyond the maximum height and width dimensions of the single-axle trailer chassis and can be moved out laterally from the frame. In addition, the support feet are each provided with their own impeller, so that the assembly scaffold according to the invention remains movable even after the single-axle trailer chassis has been removed. Not least because of the improved handling resulting therefrom, the assembly scaffold according to the invention can be used universally.

Fig. 1 - 3

eine Seiten-, Rück- und Unteransicht einer Ausführungsform eines erfindungsgemäß ausgebildeten Montagegerüstes in eingefahrenem Zustand;

Fig. 4 u. 5

eine Seiten- und Rückansicht einer weiteren Ausführungsform eines erfindungsgemäß ausgebildeten Montagegerüstes in ausgefahrenem Zustand in verkleinerter Darstellung;

Fig. 6

eine perspektivische, teilweise abgebrochene schematische Ansicht des Montagegerüstes mit einer erfindungsgemäßen Seilführung eines einzelnen Hubseiles;

Fig. 7 u. 8

eine Unter- und Seitenansicht einer erfindungsgemäß ausgebildeten Hebebühne des Montagegerüstes nach Fig. 1 in vergrößerter Darstellung;

Fig. 9

eine Vergrößerung des Eckbereiches einer erfindungsgemäß ausgebildeten Hebebühne entsprechend Ausschnitt IX in Fig. 7;

Fig. 10

einen teilweisen mittleren Längsschnitt durch eine erfindungsgemäß ausgebildete Seiltrommel im Bereich eines Walzenkörpers gemäß Linie X-X in Fig. 7 in vergrößerter Darstellung;

Fig. 11

einen teilweisen Querschnitt durch eine erfindungsgemäß ausgebildete Seiltrommel im Bereich eines Walzenkörpers gemäß Linie XI-XI in Fig. 10;

Fig. 12

eine Seitenansicht eines erfindungsgemäß ausgebildeten Führungselementes nach Fig. 10 in vergrößerter Darstellung;

Fig. 13

einen mittleren Längsschnitt durch eine erfindungsgemäß ausgebildete Stütze im Eckbereich der Hebebühne des Montagegerüstes gemäß Linie XIII-XIII in Fig. 9 in vergrößerter Darstellung;

Fig. 14

einen teilweisen Querschnitt durch eine erfindungsgemäß ausgebildete Stütze gemäß Linie XIV-XIV in Fig. 13;

Fig. 15

einen Querschnitt durch eine erfindungsgemäß ausgebildete Stütze gemäß Linie XV-XV in Fig. 13;

Fig. 16 + 17

eine Seiten- und Oberansicht eines erfindungsgemäß ausgebildeten Gestells des Montagegerüstes nach Fig. 1 in vergrößerter Darstellung;

Fig. 18

einen teilweisen mittleren Längsschnitt durch eine erfindungsgemäß ausgebildete und in eine Aufnahmevorrichtung eingesteckte Stütze im Eckbereich des Gestells des Montagegerüstes gemäß Linie XVIII-XVIII in Fig. 17 in vergrößerter Darstellung;

Fig. 19

eine schematische Draufsicht auf eine erfindungsgemäß ausgebildete Stütze gemäß Linie XIX-XIX in Fig. 18;

Fig. 20 + 21

eine schematische Seiten- und Unteransicht eines erfindungsgemäß ausgebildeten Einachs-Hängerfahrwerks gemäß Fig. 1;

Fig. 22

einen mittleren Längsschnitt durch eine erfindungsgemäß ausgebildete Rastvorrichtung entsprechend Ausschnitt XXII in Fig. 20 in vergrößerter Darstellung zusammen mit einem arretierten Gestell des Montagegerüstes;

Fig. 23

eine Oberansicht auf eine erfindungsgemäß ausgebildete Gelenkgabel;

Fig. 24

einen Mittellängsschnitt durch eine erfindungsgemäß ausgebildete Gelenkgabel gemäß Linie XXIV-XXIV in Fig. 23;

Fig. 25

eine Oberansicht auf einen erfindungsgemäß ausgebildeten Gelenkzapfen; und

Fig. 26

einen Mittellängsschnitt durch einen erfindungsgemäß ausgebildeten Gelenkzapfen gemäß Linie XXVI-XXVI in Fig. 25.

Further features, advantages and details of the invention result from the following description of some preferred embodiments of the invention and from the drawing. Here show:

1 - 3

a side, rear and bottom view of an embodiment of an inventive scaffolding in the retracted state;

Fig. 4 u. 5

a side and rear view of another embodiment of an inventive scaffolding in the extended state in a reduced view;

Fig. 6

a perspective, partially broken schematic view of the mounting frame with a rope guide according to the invention of a single hoist rope;

Fig. 7 u. 8th

a bottom and side view of a lifting platform designed according to the invention of the mounting frame according to Figure 1 in an enlarged view.

Fig. 9

an enlargement of the corner area of a lifting platform designed according to the invention in accordance with section IX in FIG. 7;

Fig. 10

a partial central longitudinal section through a rope drum designed according to the invention in the region of a roller body according to line XX in Figure 7 in an enlarged view;

Fig. 11

a partial cross section through an inventive rope drum in the region of a roller body according to line XI-XI in Fig. 10;

Fig. 12

a side view of an inventive guide element according to FIG 10 in an enlarged view.

Fig. 13

a central longitudinal section through a support designed according to the invention in the corner region of the lifting platform of the assembly scaffold according to line XIII-XIII in Fig. 9 in an enlarged view;

Fig. 14

a partial cross section through an inventive support according to line XIV-XIV in Fig. 13;

Fig. 15

a cross section through an inventive support according to line XV-XV in Fig. 13;

Fig. 16 + 17

a side and top view of an inventive frame of the mounting frame according to Figure 1 in an enlarged view.

Fig. 18

a partial central longitudinal section through a support designed according to the invention and inserted into a receiving device in the corner region of the frame of the assembly frame according to line XVIII-XVIII in FIG. 17 in an enlarged view;

Fig. 19

is a schematic plan view of an inventive support according to line XIX-XIX in Fig. 18;

Fig. 20 + 21

is a schematic side and bottom view of an inventive single-axle trailer chassis shown in FIG. 1;

Fig. 22

a central longitudinal section through an inventive locking device according to section XXII in Figure 20 in an enlarged view together with a locked frame of the mounting frame;

Fig. 23

a top view of an inventive articulated fork;

Fig. 24

a central longitudinal section through an articulated fork according to the invention according to line XXIV-XXIV in Fig. 23;

Fig. 25

a top view of an inventive pivot pin; and

Fig. 26

25 shows a central longitudinal section through an articulated pin according to the invention along the line XXVI-XXVI in FIG. 25.

1 to 5 comprises a frame 1 which is rectangular in plan and has the same shape as a lifting platform 2 with a platform 3. The lifting platform 2 is arranged together with the platform 3 upright on the frame 1 and in the corner areas 4 Supports 5 continuously adjustable in height by lifting means, ie can be raised and lowered as required. The platform 3 is surrounded by a railing 6, which is connected, for example, by a plug connection to the lifting platform 2, the design of which can be of the most varied types (cf. FIGS. 1, 2; 4, 5). To support the mounting frame on the floor surface, 4 support feet 7 are arranged on the frame 1 in each of the corner areas, which can be extended by means of locking spindles 8 of conventional design. Finally, a single-axle trailer chassis 9 is provided for transporting the assembly scaffold, which may be moved under the frame 1 of the assembly scaffold and then releasably connected to it and vice versa. The lifting means have a rope winding device arranged on the lifting platform 2 for the synchronous winding and unwinding of lifting ropes 10, each lifting rope 10 crossing according to FIGS. 4 and 5 on a transverse side 11 and on a longitudinal side 12 of the assembly frame with a further lifting rope each diagonally across the surface .

The support feet 7 according to FIGS. 1 and 4 in the corner regions 4 of the frame 1 can be extended at least beyond the maximum height or width dimensions of the single-axle trailer chassis 9 or can be moved out laterally from the frame 1. While the extension of the support feet 7 in the vertical direction is carried out by extending the locking spindles 8, the support feet 7 are displaced in the horizontal direction from the plane of the longitudinal sides 12 of the mounting frame, for example by tubular support parts (not shown) rigidly connected to each support foot 7 . These carrier parts are longitudinally displaceably received in corresponding receiving parts 13 (cf. FIGS. 16 and 22), each of which is on the transverse sides 11 of the frame 1 above its underside 14 are arranged so that these receiving parts 13 do not protrude beyond the underside 14 of the frame 1 and thus do not influence or hinder the underrun of the frame 1 by the single-axle trailer chassis 9.

As can also be seen from FIGS. 1 and 4, the support feet 7 are each inclined from the frame 1 towards the outside in the vertical direction. Such an inclined position of the support feet 7 ensures play-free support of the assembly scaffold as a whole, especially on an uneven floor surface. Furthermore, the support feet 7 are each provided with an impeller 15, so that the mounting frame itself remains movable after removal of the single-axle trailer chassis 9. In order to be able to secure the assembly scaffold against rolling after removal of the single-axle trailer trolley 9, the support feet 7 or the locking spindles 8 can each be individually extended at least until each impeller 15 is lifted off the ground. In addition, the wheels 15 are arranged on the corresponding support feet 7 such that the wheels are in contact with the ground through the uniaxial trailer chassis 9 while the mounting frame is being driven under. In this way, it is easy to make position corrections between the single-axle trailer chassis 9 and the assembly scaffold due to its movability even during the coupling process without difficulty.

According to FIG. 6, two hoisting ropes 10 are connected to one another to form a common rope 16 and guided over a common rope drum 17. In detail, the rope guide for each hoisting rope 10 results from FIG. 6. Thereafter, each hoisting rope 10 runs, starting from the rope drum 17, over a first deflection roller 18 arranged on the lifting platform 2, over a second one, at the upper end 19 of the associated support 5 arranged deflecting roller 20 and from there via a third deflecting roller 21 arranged in turn on the lifting platform 2. From this third deflecting roller 21, each hoisting rope 10 is guided via a fourth deflecting roller 22, also arranged at the upper end 19 of the associated support 5, and then via a fifth, at the lower end 23 of the assigned support 5 or on the frame 1 arranged deflection roller 24 passed. From this fifth deflection pulley 24, the hoisting ropes 10 each run diagonally along the transverse side 11 along the assembly frame to a sixth deflection pulley 25 arranged on the lifting platform 2 in the area of the adjacent support 5 ′ led along the assembly scaffold for the articulation of each hoisting rope 10 at the lower end 23 of the support 5 ″ adjacent to the support 5 ′ or in the area there directly on the frame 1. The cable routing of the lifting cable 10 assigned to the support 5 ″ corresponds to the cable routing described above. The cable routing of the remaining two hoisting ropes 10, which are assigned to the support 5 'or the fourth support 5, which is not shown in FIG. 6, also corresponds to the cable guide described above, which is, however, reversed.

The supports 5, 5 ', 5''are designed as polygonal profiles, in particular square tube profiles, the square tube profiles preferably having a square shape. The width of the side walls of the supports 5, 5 ', 5''corresponds approximately to the diameter of the deflecting rollers 18, 20, 21, 22, 24, 25, so that the lifting cables 10 are guided in the immediate vicinity of the supports 5 but do not touch. This also has the advantage that the deflection rollers 18, 20, 21, 22, 24, 25 can be arranged on different side walls 27 of the supports 5. The first, second and fourth deflecting rollers 18, 20, 22 are each rotatably received by an axis running approximately parallel to the transverse sides 11 of the assembly frame. In addition, the second and fourth deflecting rollers 20, 22 are arranged at the upper end 19 of the associated support 5, but on opposite side walls 27 of the supports 5. Furthermore, the third and fifth deflecting rollers 21, 24 are each rotatably received by an axis running approximately parallel to the longitudinal sides 12 of the assembly frame. Here, the fifth deflection roller 24 is arranged at the lower end 23 of the associated support 5 on a side wall 27 of the support 5 facing away from the third deflection roller 21.

7, the axis of rotation 28 of the sixth deflection roller 25 is in turn rotatably supported. In this way, a corresponding adaptation of the surface-diagonally running cable sections of the lifting cables 10 to the respective height adjustment of the lifting platform 2 is achieved. Thus, the axis of rotation 28 of the sixth deflection roller 25 is received by a U-shaped support 29 which is rotatably connected to the lifting platform 2. The axis of rotation 28 of the sixth deflection roller 25 is supported at the ends on the two longitudinal legs 30 of the U-shaped support 29. The cross leg 31 of the U-shaped support 29 connecting the two longitudinal legs 30 of the U-shaped support 29 is fixedly connected to an approximately vertically projecting axis 32 which in turn is rotatably attached to the lifting platform 2.

7 and 8, the lifting platform 2 of the assembly frame with the walk-on platform 3 is shown. The platform consists of individual plates 33 made of aluminum or the like connected to one another, for example by welding, the surface of which is preferably additionally profiled. Below the platform 3, a cable drum 17 is arranged on the lifting platform, which runs approximately parallel to the transverse sides 11 of the mounting frame and is rotatably mounted on the inner longitudinal sides 12 of the mounting frame. The cable drum 17 consists of two individual roller bodies 34, each of which accommodates a cable 16 connecting two lifting cables 10 to one another. The two roller bodies 34 are driven synchronously via a common shaft 35. A motor 36, for example an electric motor, is provided as the actuating member for driving the cable drum 17, which is preferably arranged between the mutually facing end faces 37 of the two roller bodies 34 for performance reasons. As an alternative to this, a hand-operated crank, which is then likewise arranged on the lifting platform 2, can also be provided.

The one roller body 34 of the cable drum 17 shown in FIGS. 10 and 11 is provided on the outer circumference 38 with receiving grooves 39 for the windings of the lifting cables 10. At the same time the roller body 34 with an axially movable pressure shell 40, through which the windings of the hoisting ropes 10 are held captive. The embodiment of the pressure shell 40 according to FIGS. 10 and 11 is longitudinally formed, the two partial shells 41 and 42 being releasably connected to one another via a flange screw connection 43. This embodiment has the advantage of a considerably simplified assembly and maintenance of the pressure shell 40.

The pressure shell 40 has at least one guide element 45 on its inner circumference 44, which is in contact with the outer circumference 38 of the respective roller body 34 for the axial movement of the pressure shell 40. In particular, the guide element 45 projects into at least one receiving groove 39 of the roller body 34. 12, the guide element 45 is designed as a guide wire 46. The guide wire 46 has, on the one hand, a central, circular arc-like leg 47, which partially projects into a receiving groove 39. On the other hand, the guide wire 46 consists of two ends 48 pointing against the curvature of one leg 47. The two legs 48 are provided for attachment to the inner circumference 44 of the pressure shell 40, which are preferably inserted into corresponding bores under prestress. So that the guide wire 46 or its leg 47 rests positively in the receiving groove 39 of the roller body 34, its diameter corresponds approximately to that of the hoisting ropes 10 and also approximately to the diameter of the receiving grooves 39. For the form-fitting reception of the guide wire 46, the radius of curvature thereof is also Leg 47 adapted approximately to that of the outer circumference 38 of the roller body 34. In practice, it has proven to be advantageous to dimension the circular arc of one leg 47 of the guide wire 46 at approximately 90 °, since as a result, on the one hand, the friction of the guide wire 46 in the receiving groove 39 is kept relatively small and, on the other hand, secure axial entrainment of the Pressure bowl 40 is guaranteed.

10 shows that the pressure shell 40 is provided on its inner circumference 44 with a total of 4 pressure elements 49. The pressure elements 49 are in line or point contact with the two hoisting ropes 10 in the area of the first hoisting rope winding, as in this case. In this way, the two hoisting ropes 10 are each held captively in the corresponding receiving groove 39 of the roller body 34. Rolling bearings 50 are preferably provided as pressure elements 49, the axes of rotation 51 of which lie essentially parallel to the shaft 35 of the cable drum 17. Their outer bearing shells 52 are located in a punctiform manner on the two hoisting ropes 10 in the area of the first hoisting rope winding. Two of the four roller bearings 50 are preferably arranged directly in the region of the first contact point 53 of the respective hoisting rope 10 and receiving groove 39 of the roller body 34 (cf. in particular FIG. 11). Of the four roller bearings 50, two roller bearings 50 - here the upper one to the lower one - are arranged offset from one another both in the circumferential and in the axial direction of the pressure shell 40. Accordingly, the two, that is to say the upper to the lower roller bearing 50, are offset on the one hand by approximately 180 ° on the circumference of the pressure shell 40 and, on the other hand, corresponding to the inclination of the receiving grooves 39 by approximately half a winding pitch of the lifting cables 10 in the axial direction of the pressure shell 40 . In order to keep the frictional resistance as low as possible with a large pressing force, the pressing elements 49 in the present embodiment of the pressing shell are designed as radial ball bearings. However, it is also conceivable to instead of each of the two, ie here the upper to the lower, roller bearings 50 only attach a single roller bearing to the pressure shell 40, the inner bearing shells of which then press the hoisting rope 10 into the associated receiving groove 39. Finally, it is just as possible to design the pressure elements 49 as ribs or the like which protrude on the inner circumference 44 of the pressure shell 40 and are adapted to the slope of the receiving groove 39.

As shown in FIGS. 13 and 15, the lifting platform 2 is provided in the corner regions 4 with guide sleeves 54, which each enclose a support 5 so as to be longitudinally displaceable. In each guide sleeve 54, two at least two opposite side walls 27 of the support 5 associated with guide rollers 55 are rotatably mounted to reduce the frictional resistance when adjusting the height of the lift. The guide rollers 55, the length of which essentially corresponds to the width of the side walls 27 of the supports, are mounted in the region of the guide sleeves 54 facing the frame 1, their axes of rotation 56 running approximately parallel to the transverse sides 11 of the assembly frame. To simplify the construction, the guide sleeves 54 according to FIG. 15 are part of the lifting platform 2, since the axes of rotation 56 of the guide rollers 55 are embedded in the longitudinal sides 12 of the lifting platform 2, for example.

In addition, the lifting platform 2 is provided with braking devices 57, as shown in FIGS. 13 and 14. These are each assigned to a support 5 and trigger automatically when the corresponding hoisting rope 10 breaks. A height adjustment of the lift 2 is therefore excluded. Each braking device 57 comprises a two-armed bracket 58 received in the corresponding guide sleeve 54. The bracket 58 can be tilted about an axis 60 which is approximately parallel to the axis of rotation 59 of the first deflecting roller 18, and is spring-loaded. One arm 61 of the holder 58 is provided with a braking element 62, while the other arm of the holder 58 carries the first deflection roller 18. On the arm 63, two compression springs 64 are also articulated, which are supported on the guide sleeve 54. The spring force of the two compression springs 64 is chosen to be as large as the rope tension of the lifting rope 10 guided over the first deflection pulley 18. As a result, the spring tension and the rope tension cancel each other out when the rope 10 is intact. Furthermore, one arm 61 of the holder 58 grips the respective support 5 in a fork-shaped manner with two side plates 65, which are rigidly connected to one another in the region of the other arm 63 carrying the first deflecting roller 18, for example via a sheet metal 66. Instead of the compression springs 64 engaging on the arm 63, it is just as conceivable for the arm 61 of the Bracket 58 to act tension springs.

The brake element 62 shown in FIG. 13 is two brake shoes 67 arranged on opposite side walls 27 of the corresponding support 5. The brake shoes 67 are rotatably received at one end 68 by one arm 61 of the holder 58. With its other end 59, which tapers in a wedge shape, the brake shoes 67, on the other hand, are held between a fixed stop 70 and the respectively adjacent side wall 27 of the support 5. When the hoisting rope 10 breaks, the spring-loaded bracket 58 is immediately tilted about its axis of rotation 60, so that each brake shoe 67 is automatically displaced longitudinally upward in the vertical direction. The force generated by the compression springs 64 wedges the brake shoes between the fixed stop 70 and the adjacent side wall 27 of the support 5. The dead weight of the lifting platform 2 further increases this wedge effect. In order not to negatively influence the smoothness of the assembly scaffold during the height adjustment, the two brake shoes 67 on the other arm 63 of the holder 58 can be rotated by means of two axes of rotation 71 running approximately parallel to their axis of rotation 60 and with play between the fixed stop 70 and the respective side wall 27 the support 5 is articulated. In addition, the fixed stop 70 is designed as a pin or the like. Due to its shape or rotatable outer shell, the respective brake shoe 67 hardly opposes any frictional resistance.

The frame 1 shown in FIGS. 16 and 17 has tubular receiving devices 72 in the corner regions 4, each of which has a conically tapering opening 73 according to FIGS. 18 and 19. The conically tapering opening 73 serves in each case to accommodate and support the supports 5 without play, which are formed at their lower end 23 with a cone 74 which also tapers and is provided for releasable connection to the frame 1. As a result, the cone 74 of each support 5 can be inserted with a precise fit into the conical opening 73 of the receiving device 72. Each receiving device 72 is also provided with one in the opening 13 arranged eccentric 75 which can be rotated about an axis of rotation 77 which is approximately perpendicular to the longitudinal axis 76 of each receiving device 72. When actuated, ie when rotating, the eccentric 75 acts against the end face 78 of the cone 74 and finally pushes the cone 74 with the support 5 out of the receiving device 72. In this way, the press fit received between the support 5 and the frame 1 can be released quickly and easily. To simplify manufacture, the eccentric 75 is placed on a bolt 79 or the like which is inserted through the receptacle 72 from the outside. In order to keep the structural complexity of such a release mechanism as low as possible, the pin 79 provided with the eccentric 75 coincides with the axis of rotation 80 of the fifth deflection roller 24. To actuate the eccentric 15, ie to rotate it, a dismantling lever 81 or the like is finally provided which passes through the bolt 79 or the axis of rotation 80.

In order to detachably couple the single-axle trailer trolley 9 shown in FIGS. 1 to 5 after moving under the assembly scaffold, ie the underside 14 of the frame 1, there are mutually cooperating receiving devices 82 and one on the single-axle trailer chassis 9 and on the frame 1 Locking device 83 arranged according to FIGS. 20 to 22. Provided as receiving devices 82 on the single-axle trailer chassis 9 are two axially fastening tabs 84 spaced apart from one another, which extend approximately horizontally and are rigidly connected to the wheel axle 85. These axle fastening tabs 84 also each have a groove 87 facing away from the trailer coupling 86, into which a vertical stop bolt 88, which is firmly connected to the frame 1, can be inserted and fixed. The stop bolts 88 are each arranged about half the length of the long side 12 of the frame 1 on the underside 14 thereof. In order to fix them in the vertical direction or to reach under the respective axle mounting bracket 84 with almost no play, these stop bolts 88 are additionally provided with an annular stop surface or thickening 89 (cf. also FIG. 16). Finally, the single-axle trailer chassis 9 is also with a vertically displaceable Locking lever 90 equipped as a locking device 83 which passes through a receiving pocket 92 or the like attached to the frame 91 of the single-axle trailer chassis 9. At the same time, a fastening tongue 93 with a vertical through-bore 94 is welded to the frame 1 of the assembly frame in the area of at least one of the two transverse sides 11. After inserting the fastening tongue 93 into the receiving pocket 92, the latching lever 90 engages through the receiving pocket 92 and fastening tongue 93, as a result of which the frame 1 of the mounting frame is ultimately captively connected to the single-axle trailer chassis 9. To secure the locking lever 90 is designed by means of a mechanical locking device 95 or the like. So that it is held captively in the bore 94 of the fastening tongue 93, for example by a compression spring 96.

To further improve the manageability of the assembly scaffold according to the invention, the lifting means can of course be actuated from the lifting platform 2. A load limiting device is also helpful insofar as the actuation of the lifting means is blocked when a maximum load acting on the lifting platform 2 is exceeded. Such a load limiting device could, for example, respond to a specific rope tension value of a hoisting rope 10.

23-26, a folding joint 99 is shown which connects the upper end 98 of a support section 97 which is arranged upright on the frame 1 and is not shown in more detail and the lower end 23 of the associated support 5. The support 5 hinged in this manner to the support section 97 can be locked in its functional position in an extension of the support section 97 without play. The folding joint 99 is composed of the joint fork 100 and the joint pin 101, which are rotatably coupled to one another via the common axis of rotation 102 in the form of a bolt or the like. The ends 103, 104 of the joint fork 100 or joint pin 101 facing away from the axis of rotation are designed as plug-in socket connections or the like and into the upper end 98 of the support section 97 or the lower end 23 of the associated support 5 and vice versa can be inserted without play. After insertion, the ends 103, 104 of the joint fork 100 or joint pin 101 are fastened to the upper end 98 of the support section 97 or to the lower end 23 of the associated support 5 and vice versa by welding, riveting, screwing or the like. The joint fork 100 of the folding joint 99 is approximately U-shaped and rotatably receives the joint pin 101 of the folding joint 99 via its two longitudinal legs 105. The articulated fork 100 and the articulated pin 101 of the folding joint 99 can be locked with one another without play via a spring-preloaded longitudinal bolt 106 in the functional position of the corresponding support 5. The longitudinal bolt 106, which is only indicated schematically in FIGS. 25 and 26, is received, like the compression spring 107, by the longitudinal bore 108 of the pivot pin 101 and is arranged to be longitudinally displaceable therein. The maximum longitudinal displacement of the longitudinal pin 106 out of the longitudinal bore 108 is limited by safety measures, not shown, so that the longitudinal pin 106 cannot be lost. The longitudinal bolt 106 which is spring preloaded in the hinge pin 101 of the folding joint 99 in the direction of the joint fork 100 can be received for locking with the U-shaped joint fork 100 in a longitudinal bore 109 of the transverse leg 110 of the joint fork 100 which supports the two longitudinal legs 105.

The articulated fork 100 and the articulated pin 101 of the hinged joint 99 can in turn be separated from one another by means of an end locking element from the latched position for folding down the supports 5, for example for transport purposes of the entire assembly scaffold. The end locking element can be actuated from the outside and is operatively connected to the spring-loaded longitudinal bolt 106. The bolt 112 is provided as the final locking element, which acts on the end face 111 of the longitudinal bolt 106 and is designed to be displaceable against the spring force. For the purpose of actuation, the bolt 112 is mechanically coupled to a lever, button or the like (not shown in more detail) which passes through at least one side wall 27 of the associated support 5 or the support section 97 and can be actuated from the outside.

Each support section 97 is provided with a length which corresponds approximately to the height of the railing 6 of the mounting frame surrounding the platform 3, whereby the maximum lifting height of the lifting platform 2 of the mounting frame is increased and at the same time it is ensured that the supports 5 can be folded down onto the frame 1 . The assembly scaffold according to the invention is thereby given a compact design, which is required in particular for transport or storage purposes of the assembly scaffold. In order to additionally improve the compact construction of the assembly scaffold, two supports 5, which are arranged adjacent to one another, in particular on the longitudinal side 12 of the assembly scaffold, are designed to be folded over in pairs, the support sections 97 of these supports 5 being of different lengths. As a result, the two supports 5 can lie one above the other.

Claims (67)

1. Box-shaped mounting frame with a lifting platform which, along supports disposed uprightly on a base, can be continuously height adjusted by lifting means, which comprise a cable winding device disposed on the lifting platform for the synchronous winding and unwinding of lifting cables or the like, wherein respectively two lifting cables are connected together to a common cable and are guided over a common winding drum, characterised in that the lifting cables (10) are guided respectively from the winding drum (17) over a first deflection pulley (18) disposed on the lifting platform (2), over a second deflection pulley (20) disposed at the upper end (19) of the associated support (5), over a third deflection pulley (21) disposed on the lifting platform (2), over a fourth deflection pulley (22) again disposed at the upper end (19) of the associated support (5), over a fifth deflection pulley (24) disposed at the lower end (23) of the associated support (5) or on the base (1), plane diagonally on a transverse side (11) along the mounting frame over a sixth deflection pulley (25) disposed on the lifting platform (2) in the region of the adjoining support (5') and plane diagonally on a longitudinal side along the mounting frame in order to be anchored to the lower end (23) of the support (5'') adjoining the support (5') or to the base (1).
2. Mounting frame according to claim 1, characterised in that each lifting cable (10) crosses in a plane diagonal manner with a further lifting cable (10) on a transverse and a longitudinal side (11, 12) of the mounting frame.
3. Mounting frame according to at least one of the previous claims, characterised in that the winding drum (17) is rotationally disposed on the lifting platform (2) under a platform (3), and extending approximately parallel to the transverse or longitudinal sides (11 or 12) of the mounting frame, in particular to the transverse sides (11).
4. Mounting frame according to at least one of the previous claims, characterised in that the winding drum (17) consists of two individual roller bodies (34) each receiving a cable (16) connecting two lifting cables (10) to each other.
5. Mounting frame according to claim 4, characterised in that the roller bodies (34) can be driven by a common shaft (35).
6. Mounting frame according to at least one of claims 4 and 5, characterised in that in order to drive the winding drum (17) an actuating member (36) is provided, in particular a motor disposed between the mutually facing front ends (37) of the two roller bodies (34).
7. Mounting frame according to at least one of the previous claims, characterised in that each roller body (34) of the winding drum (17) is provided on the outer surface (38) with reception grooves (39) for the lifting cable windings and is surrounded by an axially displaceable pressing shell (40) for the lifting cable windings.
8. Mounting frame according to claim 7, characterised in that the pressing shell (40) is provided on the inner surface (44) with at least one guide element (45) which for the axial displacement of the pressing shell (40) is in contact with the outer surface (38) of the respective roller body (34), in particular protrudes into at least one reception groove (39).
9. Mounting frame according to claim 8, characterised in that the guide element (45) is formed as a guide wire (46) which consists of a middle arc-shaped limb (47) partially protruding into a reception groove (39) and two limbs (48) directed at the end against the curvature of the one limb (47) and provided to be fixed to the inner surface (44) of the pressing shell (40).
10. Mounting frame according to claim 9, characterised in that the guide wire (46) comprises a diameter which corresponds approximately to that of the lifting cable (10).
11. Mounting frame according to at least one of claims 9 and 10, characterised in that the curving radius of the one limb (47) of the guide wire (46) corresponds approximately to that of the outer surface (38) of the roller body (34).
12. Mounting frame according to at least one of claims 9 to 11, characterised in that the arc of the one limb (47) of the guide wire (46) extends through about 90°.
13. Mounting frame according to at least one of claims 7 to 12, characterised in that the pressing shell (40) is provided on the inner surface (44) with at least two pressing elements (49) which are in contact, linearly or at points, with the two lifting cables (10) in the respective region of the first lifting cable winding in such a way that the two lifting cables (10) are each captively held in the corresponding reception groove (39) of the roller body (34).
14. Mounting frame according to at least one of claims 7 to 13, characterised in that at least two rolling bearings (50) or the like are provided as pressing elements (49), of which the rotational axes (51) lie substantially parallel to the shaft (35) of the winding drum (17) and of which the outer bearing shells (52) lie at points on the two lifting cables (10) in the region at least of the first lifting cable winding, preferably in the region of the first contact point of the respective lifting cable (10) and reception groove (39) of the roller body (34).
15. Mounting frame according to claim 14, characterised in that four rolling bearings (50) or the like are provided as pressing elements (49), wherein in each case two rolling bearings (50) are disposed offset to each other in the surface direction and axial direction of the pressing shell (40).
16. Mounting frame according to claim 15, characterised in that the two rolling bearings (50) are disposed offset to each other, in particular by about 180°, on the surface of the pressing shell (40) and corresponding to the incline of the reception grooves by about one half winding turn of the lifting cable (10) in the axial direction of the pressing shell (40).
17. Mounting frame according to at least one of claims 13 to 16, characterised in that the pressing elements (49) are formed as radial ball bearings.
18. Mounting frame according to at least one of the previous claims, characterised in that the pressing shell (40) is formed longitudinally divided, wherein the two part shells (41, 42) are releasably connected to each other.
19. Mounting frame according to at least one of the previous claims, characterised in that the supports (5) are formed as multiple edge profiles, in particular four edged tube profiles and at their lower ends (23) are provided with a tapering cone (74) provided for releasable connection to the base (1).
20. Mounting frame according to claim 19, characterised in that the four edged profile is formed as a square.
21. Mounting frame according to at least one of the previous claims, characterised in that the diameter of the deflection pulleys (18, 20, 21, 22, 24, 25) corresponds approximately to the width of the lateral walls (27) of the supports (5).
22. Mounting frame according to at least one of the previous claims, characterised in that the first, second and fourth deflection pulleys (18, 20, 22) are each rotationally received by an axis extending approximately parallel to the transverse sides (11) of the mounting frame, wherein the second and fourth deflection pulleys (20, 22) are disposed at the upper end (19) of the associated support (5) on opposite lateral walls (27) of the support (5).
23. Mounting frame according to at least one of the previous claims, characterised in that the third and fifth deflection pulleys (21, 24) are each rotationally received by an axis extending approximately parallel to the longitudinal sides (12) of the mounting frame, wherein the fifth deflection pulley (24) is disposed at the lower end (23) of the associated support (5) on a lateral wall (27) of the support (5) remote from the third deflection pulley (21).
24. Mounting frame according to at least one of the previous claims, characterised in that the rotational axis (28) of the sixth deflection pulley (25) is for its part rotationally mounted for corresponding adaptation of the plane diagonally extending cable portions of the lifting cable (10) to the respective height displacement of the lifting platform (2).
25. Mounting frame according to claim 24, characterised in that the rotational axis (28) of the sixth deflection pulley (25) is received by a U-shaped bracket (29) rotationally connected to the lifting platform (2).
26. Mounting frame according to claim 25, characterised in that the two longitudinal limbs (30) of the U-shaped bracket (29) receive at the ends the rotational axis (28) of the sixth deflection pulley (25) and the transverse limb (31) of the U-shaped bracket (29) is firmly connected to an approximately vertically protruding axis (32) rotationally mounted on the lifting platform (2).
27. Mounting frame according to at least one of the previous claims, characterised in that the lifting platform (2) is provided with guide sleeves (54) which each surround a support (5) in a longitudinally displaceable manner, wherein in each guide sleeve (54) at least two guide rollers (55) allocated to opposite lateral walls (27) of the support (5) are rotationally mounted.
28. Mounting frame according to claim 27, characterised in that the guide rollers (55) are disposed in the lower region of the guide sleeve (54) and the rotational axes (56) thereof extend approximately parallel to the transverse sides (11) of the mounting frame.
29. Mounting frame according to at least one of claims 27 and 28, characterised in that the guide rollers (55) substantially correspond in length to the width of the lateral walls (27) of the support (5).
30. Mounting frame according to at least one of claims 27 to 29, characterised in that the guide sleeves (54) are part of the lifting frame (2).
31. Mounting frame according to at least one of the previous claims, characterised in that the lifting frame (2) is provided with braking devices (57) which are each associated with a support (5) and are automatically actuated when the corresponding lifting cable (10) is pulled in order to prevent a height displacement of the lifting platform (2).
32. Mounting frame according to claim 31, characterised in that each braking device (57) comprises a two-arm spring-loaded holding device (58) received in the corresponding guide sleeve (54) so as to tilt about an axis (60) extending approximately parallel to the rotational axis (59) of the first deflection pulley (18), on one arm (61) of which holding device at least one braking element (62) is disposed and on the other arm (63) of which the first deflection pulley (18) is disposed.
33. Mounting frame according to claim 32, characterised in that the resilient force effective on the holding device (58) can be compensated by the corresponding lifting cable (10) over the first deflection pulley (10)
34. Mounting frame according to at least one of claims 32 and 33, characterized in that to the other arm (63) of the holding device (58) carrying the first deflection pulley (18) is coupled at least one compression spring (64) bearing against the guide sleeve (54).
35. Mounting frame according to at least one of claims 31 to 34, characterised in that one arm (61) - the one comprising the braking element (62) - of the holding device (58) is formed surrounding the respective support (5) in a fork-like manner.
36. Mounting frame according to claim 35, characterised in that the holding device (58) is formed from two lateral plates (65) which are rigidly connected to each other in the region of the other arm (63) carrying the first deflection pulley (18).
37. Mounting frame according to at least one of claims 31 to 36, characterised in that as a breaking element (62) at least one, preferably two brake blocks (67) are provided, disposed on opposite lateral walls (27) of the corresponding support (5), which brake blocks with one of their ends (68) are rotationally received by one arm (61) of the holding device (58) and with their other end (69), extending in a wedge shape, are each held between a stationary stop (70) and the adjoining lateral wall (27) of the support (5).
38. Mounting frame according to claim 37, characterised in that, when the lifting cable (10) is pulled by the spring-loaded holding device (58), each brake block (67) can be wedged in a longitudinally displaceable manner and wedged between the fixed stop (70), in particular a pin or the like and the adjoining lateral wall (27) of the support (5).
39. Mounting frame according to at least one of claims 36 and 37, characterised in that one arm (61) of the holding device (58) is provided with two rotational axes (71) for the brake blocks (67), which axes extend approximately parallel to the rotational axis (60) of the holding device and adjoin the opposite lateral walls (27) of the support (5).
40. Mounting frame according to at least one of the previous claims, characterised in that the base (1) comprises tube-like reception devices (72) each with a conically tapering opening (73) into which the cone (74) at the lower end (23) of each support (5) can be inserted without play.
41. Mounting frame according to claim 40, characterised in that each reception device (72) is provided with an eccentric (75) which is disposed in the opening (73) and is rotatable about a rotational axis (77) approximately perpendicular to the longitudinal axis (76) of the reception device (72), which eccentric cooperates with the end front face (78) of the cone (74) in such a way that this cone can be pushed out of the opening (73) when the eccentric (75) is actuated.
42. Mounting frame according to claim 41, characterised in that the eccentric (75) is provided on a pin (79) or the like inserted through the reception device (72) from the outside.
43. Mounting frame according to at least one of claims 41 and 42, characterised in that the pin (79) provided with the eccentric (75) lies flush with the rotational axis (80) of the fifth deflection pulley (24).
44. Mounting frame according to at least one of claims 41 to 43, characterised in that the pin (79) provided with the eccentric (75) as a continuation of the rotational axis (80) of the fifth deflection pulley (24) comprises a dismantling lever (81) or the like passing transversely through pin (79) or rotational axis (80).
45. Mounting frame according to at least one of the previous claims, characterised in that the mounting frame can be coupled to and under-driven by a trailer chassis, preferably a single axle trailer chassis (9).
46. Mounting frame according to claim 45, characterised in that the single axle trailer chassis (9) can be coupled to the base (1) of the mounting frame by cooperating reception and locking devices (82, 83).
47. Mounting frame according to claim 46, characterised in that on the single axle trailer chassis (9) two axle fixing tabs (84) spaced from each other as reception devices (82), extending approximately horizontally and attached to the wheel axle (85) or the like are provided, which each comprise a groove (87) remote from the trailer coupling (86), in which groove a vertical stop pin (88) firmly connected to the base can be inserted and received.
48. Mounting frame according to claim 47, characterised in that the stop pins (88) are each disposed approximately half way along the length of the longitudinal side (12) of the base (1) on its under side (14) and comprise an annular stop surface (89) to engage in an almost play-free manner under the corresponding axle fixing tab (84).
49. Mounting frame according to at least one of claims 46 to 48, characterised in that on the single axle trailer chassis (9) a vertical reception pocket (92) attached to the frame (91) or similar through-going locking lever (90) is provided as a locking device (83) by which a fixing tongue (93) rigidly disposed on the base (1) of the mounting frame in the region of at least one of the two transverse sides (11) and able to be pushed into the reception pocket (92) can be fixed.
50. Mounting frame according to claim 49, characterised in that the locking lever (90) can be captively held in a bore (94) of the fixing tongue (93) by means of a mechanical locking device or the like, in particular by means of a compression spring (96).
51. Mounting frame according to at least one of the previous claims, characterized in that the base (1) in its corner regions (4) is provided with support feet (7) which can be extended beyond the maximum height and width dimensions of the single axle trailer chassis (9) and which are formed to be moved laterally out from the base (1).
52. Mounting frame according to claim 51, characterised in that the support feet (7) are each displaceably disposed on the transverse sides (11) of the base (1) above its underside (14).
53. Mounting frame according to at least one of claims 51 and 52, characterised in that the support feet (7) are each adjustable in an inclined manner out from the base (1) for play-free support.
54. Mounting frame according to at least one of claims 51 to 53, characterised in that the support feet (7) are each provided with a running wheel (15) and can be extended at least until each running wheel (15) is lifted free of the floor.
55. Mounting frame according to claim 54, characterised in that the running wheels (15) fixed to the support feet (7) are in contact with the floor in order for the mounting frame to be under-driven by the single axle trailer chassis (9).
56. Mounting frame according to at least one of the previous claims, characterised in that the base (1) comprises support portions (97) of which the upper ends (98) are each connected to the lower end (23) of each support (5) by means of a folding joint (99) or the like, wherein each support (5) foldably linked to the corresponding support portion (97) can be locked in a play-free manner in its operational position as a continuation of the support portion (79).
57. Mounting frame according to claim 56, characterised in that the folding joint (99) consists of a joint fork (100) or the like and a joint spigot (101) which are connected to each other through a common rotational axis (102) and can each be inserted in a play-free manner with their end (103, 104) remote from the rotational axis (102) into the upper end (98) of the support portion (97) or the lower end (23) of the associated support (5) and are fixed to these.
58. Mounting frame according to claim 57, characterised in that the joint fork (100) of the folding joint (99) is approximately U-shaped, wherein the joint spigot (101) of the folding joint (99) is rotationally received by the two longitudinal limbs (105) of the fork.
59. Mounting frame according to one of claims 57 and/or 58, characterised in that the joint fork (100) and the joint spigot (101) of the folding joint (99) can be locked together in a play-free manner in the operational position of the corresponding support (5) by means of a spring-tensioned longitudinal pin (106).
60. Mounting frame according to claim 59, characterised in that, in the joint spigot (101) of the folding joint (99), the longitudinal pin (106) is spring biassed in the direction of the joint fork (100) and, in a longitudinal bore (109) of the transverse limb (110) carrying the two longitudinal limbs (105), can be received by the U-shaped joint fork (100).
61. Mounting frame according to at least one of claims 57 to 60, characterised in that the joint fork (100) and the joint spigot (101) of the folding joint (99) can be separated from each other out of the locking position by means of an externally operated unlocking element which is in operational connection with the spring biassed longitudinal pin (106).
62. Mounting frame according to claim 61, characterised in that as an unlocking element a pin (112) effective upon a front face (111) of the longitudinal pin (106) and displaceable against the resilient force is provided, which pin is coupled to an externally operated lever, button or the like penetrating at least one lateral wall (27) of the associated support (5) or support portion (97).
63. Mounting frame according to at least one of claims 56 to 62, characterised in that each support portion (97) is of a length which corresponds approximately to the height of the rail (6) surrounding the platform (3).
64. Mounting frame according to at least one of claims 56 to 63, characterised in that supports (5) disposed respectively in pairs next to each other, in particular on the longitudinal side (12) of the mounting frame can be folded in pairs against each other, wherein the support portions (97) of these supports (5) are of different lengths so that the two supports (5) can be laid one on another.
65. Mounting frame according to at least one of the previous claims, characterised in that the lifting means can be actuated from the lifting platform.
66. Mounting frame according to one or more of the previous claims, characterised in that a load limiting device is provided which blocks the operation of the lifting means if a maximum load is exceeded.
67. Mounting frame according to claim 65, characterised in that the load limiting device reacts to a certain cable tension value of a lifting cable (10).

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