FIELD OF THE INVENTION AND PRIOR ART The present invention relates to a tool for mounting facade elements on a building, such as a multi-storey building, wherein the tool is arranged to move the facade element horizontally towards the building. The present invention further relates to a method for mounting facade elements on a building using a tool according to the invention.

Multi-storey buildings may be constructed in a plurality of ways. Common for all of them is that they comprise a facade. The facade may be provided in a large number of different ways and may either constitute a load bearing part of the multi-storey building or only serve as weather protection. In the latter case the building comprises a building structure on which plate formed facade elements are attached.

The facade elements are often transported to the working site on pallets. These pallets are off-loaded from a delivery truck by a tower crane and then lifted to the floor where the facade ele- ments will be installed. Alternative means of lifting is by mobile crane, site hoist or using a mono rail system. All of these act as a critical resource that needs to be used by other working trades for important lifting activities to different parts of the building site, or by occupying crowded space. Waiting time for trucks and tower cranes generates waste time and substantial cost. The handling of the facade elements during final positioning on the building is sensitive and facade elements may be damaged during handling . When using cranes, there is risk for the elements to crash into earlier mounted elements or other parts of the building or nearby equipment and damages may arise. These risks increase during mounting in windy conditions, which may lead to a sta ndsti l l i n the bu i ld i ng wh i le awaiti ng cal mer weather. The fi nal installation can also made glazing robot runni ng on the floor, or by usi ng mobile mini cranes on a floor above i nstallation level . The storage and movi ng of panels on the floor is a problem since staged panels occupy space on each floor that must be left unobstructed by other trades, and also requires detailed instructions from the structural designer due to limited early concrete strength .

US Patent 4 591 308 discloses a method for hoisting facade elements on a multi-storey building without the use of tower cranes. The patent discloses a guide jig for lifting facade elements. The guide jig is suspended from a rope and is guided in vertical rails provided on th e outside of each facade element. When the facade element reaches the floor on which it is to be mou nted the facade element has to be horizontal ly moved towards the building to a mounting position before the facade element can be attached to the building . This patent proposes that the facade element is horizontal ly moved by means of the tower crane and a mechanical arm provided on the jig . This makes it possi ble to move the facade element to the fi nal mounting position without having any person on the outside of the building . However, the proposed method for movi ng the facade element to the mounting position is complicated and involves a number of mounting steps.

GB22284009 discloses a method for mounting facade elements by means of a working elevator. The facade elements are pro- vided with grooves, along which the working elevator is driven. The facade elements are transported to the floor where the fa- cade elements will be installed by the working elevator. The working elevator is provided with its own drive. The working elevator includes a pneumatically controlled system for horizontally moving the facade elements towards the building and to its mounting position. Such a working elevator is complicated and accordingly expensive. If a plurality of columns of facade elements is to be mounted in parallel, it is necessary to have a plurality of working elevators, which is expensive. OBJECTS AND SUMMARY OF THE INVENTION

The object of the present invention is to provide an improved solution to the problem of horizontally moving the facade elements from a transportation position to a mounting position.

According to one aspect of the invention this object is achieved by a tool as defined in claim 1.

The tool comprises a frame including a part for attaching the frame in a fixed position with respect to the building close to a mounting position of the facade element, and at least one member arranged to be engage to the facade element while the facade element is lowered, including a surface adapted to be in contact with the facade element while the facade element is lowered, and a lever operatively connected to the surface, wherein the lever is rotatably arranged with respect to said frame about an axis to be horizontally directed when the frame is in said fixed position, and the lever is configured to rotate about said axis in a first direction when the facade element is lowered and by that move said facade element horizontally towards the building. The member includes means for removable engaging the member to the facade element, for example by means of friction or by a mechanical locking. The tool is driven by the vertical down movement of the facade element. The weight of the facade element is used to achieve the force needed to horizontally move the facade element from the first to the second position. Thus, the tool does not have to be provided with a drive of its own, which reduces the cost, weight and versatility of the tool. The tool according to the in- vention can be made much cheaper than the previously mentioned pneumatically controlled system for moving the facade element to its mounting position. As no expensive equipment is needed it is possible to simultaneously mount a plurality of facade elements on different horizontal positions along the build- ing.

The personnel only has to mount the tool on a structure close to the mounting position from inside of the building, and to control the upward and downward vertical movements of the facade element, and the facade element will automatically be moved to its final mounting position by the mechanics of the tool.

According to an embodiment of the invention, an outer portion of the lever is adapted to rotate between a position above the hori- zontal plane and a position below the horizontal plane, said member includes a locking mechanism including a hook for mechanically locking the member to the facade element, and the locking mechanism is arranged so that the hook is automatically disengaged when the outer portion of the lever has passed the horizontal plane. This embodiment enables a quick and easy detachment of the engagement between the facade element and the tool when the facade element has been moved to its final horizontal mounting position, without any involvement of a human.

According to an embodiment of the invention, the tool comprises a spring arrangement adapted to force the lever to rotate in a direction opposite the first direction when the hook has been disengaged. By this, the member is automatically returned to its initial position. According to an embodiment of the invention, said lever has a fixed radius, and accordingly provides a fixed distance between the surface in contact with the facade element and the axis. According to another embodiment of the invention, said lever has a peripheral surface in parallel with said axis, with a distance to this axis increasing in one circumferential direction around the axis, and the member is configured to engage a surface of a facade element facing away from the building when the facade element is lowered and by that rotate about the axis in a first direction while engaging the surface of the facade element by portions of the peripheral surface at an increasing distance to the axis and by that move the facade element horizontally towards the building. The distance from the surface of the member to the rotational axis is increasing from a minimum distance to a maximum distance. The curved surface of the member is designed to enable the member to rotate from the minimum distance to the maximum distance when the surface of the member is in contact with the surface of the facade element and the fa- cade element is lowered, thereby utilizing the dead weight of the facade element to achieve a force to the facade element. For example, the tool can be used to move the facade element from a transportation position to a mounting position, at a horizontal distance from the transportation position. The difference be- tween the minimum and maximum distance between the curved surface of the member and the rotational axis corresponds the horizontal distance between the transportation position and the mounting position. The minimum distance between the curved surface of the member and the rotational axis makes it possible for the facade element to pass by the tool on its way up to the mounting position, and the increasing radius enables the tool to move the facade element in a horizontal direction when the facade element is moved downwards towards its final mounting position. According to an embodiment of the invention, said member is arranged to rotate about said axis in an opposite direction and by that turn into a working position upon affection by an upward movement of the facade element. The upward movement of the facade element affects the tool so that the rotatably member is turned into the working position.

According to an embodiment of the invention, the member is configured to frictionally engage the surface of the facade ele- ment. This means that the friction between the curved surface and the facade element must be large enough to engage the member to the facade element, thereby causing the member to rotate while it is in contact with the moving facade element, and to avoid sliding between the facade element and the member. The friction of the curved surface must be selected in dependence on the friction of the surface of the facade element. In order to achieve the desired friction between the surfaces, the curved surface may be covered with a material of high friction, such as rubber. Alternatively, the surface of the facade element may temporary be covered with a material of high friction.

According to an embodiment of the invention, the tool comprises a spring arrangement adapted to provide a torque on the member in the first direction. The member is preloaded by means of a spring arrangement. The spring arrangement provides a torque on the member, which forces the member to rotate towards the maximum distance between the curved surface of the member and the rotational axis. Thus, when the facade element is in contact with the member, the curved surface of the member is forced towards the surface of the facade element so that the surface of the member is bearing on the surface of the facade element. This embodiment keeps the curved surface of member in contact with the surface of the facade element during the vertical movement of the facade element. According to an embodiment of the invention, the member has a second peripheral surface in parallel with the axis connecting to the first peripheral surface where this has a maximum distance to the axis, and the tool is provided with a mechanical stop con- figured to stop the rotation of the member when said second peripheral surface has arrived in contact with the surface of the facade element upon rotation of the member in said first direction. For example, the second peripheral surface is flat or has a constant distance to the axis. The second surface supports the facade element when it is lowered the last distance to its final mounting position. The mechanical stop is arranged to stop the rotation of the member when the second surface is in contact with the facade element. This embodiment ensures that the facade element stays in the second position when the facade ele- ment is moved the last distance to the final mounting position.

According to an embodiment of the invention, the second peripheral surface is configured to promote sliding of the surface of a facade element thereon. The second surface is designed to slide against the surface of the facade element. Preferably, the sliding surface is made of a low friction material in order to allow the facade element to slide against the tool when the facade element is lowered to the final mounting position and attached to the building.

According to an embodiment of the invention, the tool comprises a first lever rotatably arranged with respect to said frame about a first axis, and a second lever rotatably arranged with respect to said frame about a second axis arranged at a distance from the first axis, and a first and a second surface adapted to be in contact with the facade element while the facade element is lowered, and operatively connected to said levers, and a unit, for example a transmission unit, adapted to synchronize the angular positions of the two levers. If the facade element is tall, it may be necessary to apply a pushing force at two vertically separated points on the facade element in order to move the fa- cade elements to the second position. The transmission unit ensures a parallel movement of the facade element, thereby avoiding possible damages of the facade element. This embodiment makes it possible to apply a pushing force at two vertically sepa- rated points on the facade element. Due to the synchronization of the angular positions of the members, a parallel horizontal movement of the facade element is achieved, thereby preventing a corner or an edge of the facade element from hitting the building and as a consequence causing damages.

According to an embodiment of the invention, one of the levers is arranged linearly movable in relation to the other lever to enable adjustment of the distance between the levers. This embodiment facilitates for a person standing on the inside of the building to mount a tool with two levers at the outside of the building.

According to an embodiment of the invention, the tool comprises a third of the members rotatably arranged with respect to the frame about a third axis aligned with the first axis, a fourth of the members rotatably arranged with respect to the frame about a fourth axis aligned with the second axis, and a transmission unit adapted to synchronize the angular positions of the third and fourth members. Each pair of members are adapted to be arranged on opposite sides of a structure close to the mounting position, in order to act on facade elements on both sides of the structure. This reduces the number of times the tool has to be moved. When a facade element has been mounted, only one of the tools has to be moved to the mounting position of the next facade element to be mounted.

According to another aspect of the invention, the object is achieved by the method according to claim 10. The method comprises: - attaching the frame in a fixed position with respect to the building close to a mounting position of the facade element,

- moving the facade element upwards to a position above a final mounti ng position , whereby the facade element is engaged to said member and said surface is in contact with the surface of the facade element, and

- vertically lowering the facade element towards a final mounting position wh i le said member is engaged to the facade element thereby causing the lever to rotate about said axis in said fi rst direction and by that moving the facade element horizontally towards the building .

Accordi ng to an embodiment of the invention, the facade element is moved upward to said position above the final mounting position, while the upward movement of the facade element affects the lever to rotate about said axis in a direction opposite the first direction and by that turning the member into a working position . The u pward movement of the facade element affects the tool so that the tool is tu rned i nto a worki ng position . The member is then in a desired position , i .e. in contact with the facade element, when the facade element is moved downward .

Accordi ng to an embodiment of the invention, the method comprises:

- mounting two vertical profiles, each having a slot including an outer and an inner part extending along the longitudinal axis of the profi le , on the bu i ld i ng at a d istance from each other and with the slots facing each other,

- attaching the tool to at least one of said vertical profiles,

- inserting the facade element from below into the outer part of the slots of the vertical profiles,

- moving the facade element upward until it comes into contact with the member,

- movi ng the facad e element, g u ided by the outer part of the slots , upward to a position a bove the fi nal mou nti ng position , while the upward movement of the facade element affects the lever to rotate about said axis and by that turn ing the mem ber into a working position , and

- vertically lowering the facade element towards the final mounting position while said surface is engaged to the facade element thereby causing the lever to rotate about said axis and by that moving the facade element from the outer part of the slots to the inner part of the slots.

It is advantageous to use the profi les that su pport the facade elements for holding the tool .

BRI EF DESCRI PTI ON OF THE DRAWI NGS

The invention will now be explained more closely by the descrip- tion of different embodiments of the invention and with reference to the appended figures.

Fig . 1 shows a perspective view of a tool accordi ng to a fi rst embodiment of the invention .

Fig . 2 shows a schematic side view of a simplified member.

Fig . 3 shows an enlarged view of the upper part of the tool with the transmission removed .

Fig . 4a shows a perspective view of a tool accordi ng to a second embodiment of the invention .

Fig . 4b shows an upper part of the tool in figure 4 in a view from above.

Fig . 4c shows a lower part of the tool in figure 4 in a view from above. Fig . shows a perspective view of a tool accord ing to

embodiment of the invention . Fig.6 shows a cross-sectional view of a facade element guided by an outer part of a slot in a vertical profile. Fig.7 shows a cross-sectional view of two facade elements held by the vertical profile of the first type and supported by vertical profiles of the second type.

Figs.8 and 9 illustrate how the tool is mounted on a vertical pro- file.

Figs. 10 - 17 illustrate how the tool according to the first embodiment of the invention is used for mounting a facade element on a building.

Fig. 18 shows a perspective view of a tool according to a fourth embodiment of the invention.

Fig. 19 shows the tool according to the fourth embodiment of the invention in a view from above.

Figs. 20a-g illustrate how the tool according to the fourth embodiment of the invention is used for mounting a facade element on a building.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

Figure 1 shows a perspective view of a tool for mounting facade elements on a building according to a first embodiment of the invention. The tool comprises a frame 4, attachment means 1a-b for attaching the frame in a fixed position with respect to a building, and two members 2a-b. Each member 2a-b includes a lever 5a-b in the form of a disc, rotatably arranged with respect to the frame about a rotational axis 3a-b, and having a peripheral surface 6 in parallel with the axis and with a distance to this axis increasing in one circumferential direction around the axis. In the embodiment disclosed in figure 1, the tool is provided with two attachment means 1a-b. However, the number of attachment members may vary.

In the embodiment disclosed in figure 1, the tool is provided with two members 2a-b arranged at a distance from each other. Each member is movable about an axis 3a-b. The angular positions of the vertically displaced members 2a-b are synchronized by means of a transmission unit 7, for example a chain or a synchronous transmission belt. However, the number of members may vary dependent on the height of the facade element. In alternative embodiments of the invention, the tool may have only one member, or more than two members arranged at a vertical distance from each other.

The tool comprises an upper part including the member 2a and a lower part including the member 2b. The upper and lower parts are connected by means of a rod 10. The lower part of the tool is fixedly connected to the rod and the upper part is movably connected to the rod 10. The rod 10 is movable along its longitudinal axis in relation to the upper part thereby permitting the lower part to be movable relative the upper part and accordingly permitting the member 2a to be movable relative the member 2b, thereby enable adjustment of the distance between the members.

Figure 2 shows a schematic side view of a simplified member 2a-b. The member is disc shaped and has a curved surface 6 in parallel with the axis 3a and with a radius increasing from a minimum radius r to a maximum radius R, wherein the difference between the minimum and maximum radius corresponds the horizontal distance the facade element is to be moved. The curved surface 6 forms a cam curve and is adapted to be in con- tact with the facade element. The members 2a-b are configured to frictionally engage a surface of the facade element. The fric- tion of the curved surface 6 must be selected in dependence on the friction of the surface of the facade element. For instance, if the facade element is made of glass the friction of the surface 6 must be higher than if the facade element is made of wood in order to achieve frictional engagement between the surfaces. In order to achieve the desired friction between the surfaces, the surface 6 is covered with a material of high friction, such as rubber. The member further includes a sliding surface 8 arranged in connection to the curved surface 6 and designed to slide against the surface of the facade element when it is in parallel with the facade element. In this embodiment the sliding surface is flat. However, in an alternative embodiment the sliding surface may have a constant radius with respect to the rotational axis. Preferably, the sliding surface 8 is covered with a material of low friction, such as PTFE-plast (polytetrafluoroethylene), or UHMWPE (Ultra high molecular weight polyethylene). The member is designed to enable it to rotate from the minimum radius to the maximum radius by means of friction between the facade element and the curved surface 6 when the curved surface is in contact with the surface of the facade element and the facade element is vertically moved. The member is designed so that the relation between the curved surface 6 and the axis 3b is such that the member rotates by means of friction between the facade element and the surface 6 when the surface 6 is in contact with the surface of the facade element and the facade element is vertically moved.

The curved surface 6 is designed to have a contact angle a between a line perpendicular to the contact surface at a contact point P and a line between the contact point P and the axis of rotation 3a of the member when the curved surface 6 of the member is rotating in contact with the facade element. The rotation of the member is dependent on the friction coefficient μ be- tween the curved surface 6 and the surface of the facade element. The necessary condition for the member 2a to rotate against the facade element surface is: μ > tan a

Close to the maximum radius R, the contact angle a gradually is reduced to zero at the maximum rotation angle. From the maximum radius contact point the profile of the member can be a straight line perpendicular to a line from the rotation centre to the contact point at the maximum rotation angle. The sliding surface 8 has low friction making it possible for the facade element to slide against the surface 8 when pushed in by the curved surface 6 on its way down to its final position on the building. The rotation of the member is limited to this final angle by a mechanical stop 11a-b, as shown in figure 3.

Figure 3 shows the upper part of the tool with the transmission 7 removed. As seen from the figure, the member 2a is preloaded by means of a spring arrangement 14 adapted to provide a torque T on the member in a direction towards an increasing distance to the axis 3a. The spring arrangement 14 is, for example, a torsion spring. The spring arrangement makes the member rotate with its curved surface directed downward and/or towards the facade element when tool is mounted. The rotation of the member is limited by a mechanical stop including a first pin 11a arranged at the member 2a and a second pin 11 b arranged at the axis 3a. Figures 4a-c show a perspective view of a tool for mounting facade elements on a building according to a second embodiment of the invention. The tool comprises two attachment members 1a-b for attaching the tool to a structure close to the mounting position of the facade element. In this embodiment, the tool is provided with two pair of members 2a-b,2c-d arranged at a distance from each other, each member are movable about an axis 3a-d. The axes 3a and 3c are aligned with each other. The axes 3b and 3d are aligned with each other. The angular positions of the vertically displaced members 2a, 2b and 2c, 2d are synchronized by means of a transmission unit 7a-b, for example a chain or a synchronous transmission belt. The movements of the members 2a-b on the left side of the tool and the members 2c-d on the right side of the tool are independent of each other. The members 2a-b and the members 2c-d are independently operated in order to move different facade elements. Each pair of members 2a-b,2c-d are adapted to be arranged on opposite sides of a structure close to the mounting position, such as the vertical element shown in figure 8 and 9, in order to act on facade elements on both sides of the structure. This reduced the number of times the tool has to be moved. When a facade ele- ment has been mounted, only one of the tools has to be moved to the mounting position of the next facade element to be mounted.

The tool comprises an upper part 12 including the members 2a, 2c and a lower part 13 including the members 2b, 2d. Figure 4b shows the upper part 12 of the tool and figure 4c shows the lower part 13 of the tool. The upper part 12 of the tool comprises a frame 4 supporting the axes 3a and 3c. The upper pair of members 2a, 2c are arranged on opposite sides of the frame 4. The lower part 13 of the tool includes a supporting structure 15 supporting the axes 3b and 3d. The lower pair of members 2b, 2d is arranged on opposite sides of the supporting structure 15. The frame 4 and the supporting structure 15 are connected by means of a rod 10. The lower part 13 of the tool is fixedly con- nected to the rod and the upper part 12 is movably connected to the rod 10. The rod 10 is movable along its longitudinal axis in relation to the upper part 12 thereby permitting the lower part 13 to be movable relative the upper part and accordingly permitting the lower pair of members to be movable relative the upper pair of members, thereby enable adjustment of the distance between the members and accordingly a simple installation of the tool. Figure 5 shows an alternative tool configuration where the synchronisation mechanism is arranged inside a vertical profile 24. The members 2a-c on opposite sides of the vertical profile are mechanically connected to each other and to a synchronisation mechanism arranged inside the profile synchronizing rotation of the upper and lower member pairs. On the centre of the surface of the profile on the same side to which the members are acting a rectang ular profile 26 is arranged . Below the lower mem bers 2b, 2d T-shaped profiles 28 are arranged symmetrically on each side of the rectangular profile. The T-shaped profiles make it possi ble to attach the tool to a vertical profile with T-slots on a facade below the tool level . This tool configuration can also be used in facade refurbishment where an existing facade is disas- sembled and a new facade is assembled one store at a time. The tool is then used to guide a scrap container during dismantling , to support a protection wall preventing scrap material from falling off the building , as a support duri ng assemble of new vertical profiles and to push new facade elements to its mounting position .

In the following an example of a method for mounting facade elements is descri bed . Figure 6 shows a cross-section through an example of a vertical profile 30 of a fi rst type and a facade element 41 i n a fi rst position relative the vertical element 32. The first position is the position in which the facade element is vertically transported to its mounting position. The vertical profile 30 has a cross-section , wh ich is essentially constant along the length axis of the profi le . The profi l e 30 comprises a fi rst portion 32 , which is arranged to be placed facing the bui ld ing , and a second portion 34, which is arranged to be placed facing away from the building . A slot 36 is arranged between the first and second portion on each side of the vertical profile. The slot extends along the longitudinal axis of the profile. The slot is di- vided into an inner part 38 and an outer part 39. The inner part 38 of the slot is designed to receive and house an edge part of a facade element, and the outer part 39 of the slot is designed to receive and support a second type of vertical profile. The i nner part 38 of the slot is provided with a plurality of flexi ble elements 40. The flexi ble elements 40 are made of a resilient mate- rial and are arranged to support, centre, and seal the facade element when it is mounted , as shown i n figure 7.

An edge part of a facade element 41 is supported by the outer part 39 of the slot in the vertical profile. The facade element may comprise glass plates, or laminated glass, one or more weatherproof plates or a combination of glass plates and weatherproof plates and may also comprise a frame which holds the glass plates and/or the weatherproof plates. The edge of the facade element is provided with a protruding part extending along the entire length of the facade element. The protruding part of the edge of the facade element is located in the outer part of the slot. The opposite edge of the facade element is provided with a correspondi ng protruding part (not shown), which is located in the outer part of the slot of another vertical element of the first type arranged at a distance from the first vertical element.

The second portion 34 comprises an outer surface on which there is arranged a plurality of supporting profiles 42, which extend along the longitudi nal axis of the profile 30, and between which notches 44 are arranged . The supporti ng profiles 42 are being used to guide and support the tool . Another example of a vertical profile is disclosed in WO2009/093948.

The facade element is verti ca l ly moved u nti l it i s cl ose to its mou nti ng positi on . Wh en th e facade element has reached its mounti ng position or close to the mounting position, the facade element must be moved from the outer part 39 to the inner part 38 of the slots. A horizontal force is needed i n order to overcome the resistance from the flexi ble elements 40 on the vertical profile. Figure 7 shows the facade element 12 when it has been moved from the first position in the outer part 39 of the slot to a second position in the inner part 38 of the slot of the vertical profile 30. Figure 7 also shows a profile 46 of a second type, which is designed to fit in the outer part 39 of the slot, and arranged to support the facade element 41 when it has been mounted, and to seal between the facade element 41 and the vertical profile 30.

Figures 8 and 9 illustrate mounting of a tool for pushing the facade element from the outer part 39 of the slot to the inner part 38 of the slot of the vertical profile of the first type. According to the invention, a specially designed tool is used for performing this step, for example the tool shown in figure 1. The members 2a-b are shaped so that the difference between the minimum and maximum radius of the members corresponds to the hori- zontal movement that is required for pushing the facade element from the outer part 39 of the slot to the inner part 38 of the slot. At the maximum radius of the member the member is provided with a sliding surface 8 adapted to bear on the facade element 41. The sliding surface 8 of the member is covered with a low friction material, and the curved surface is covered with a high friction material. The angular movement of the member is stopped when the sliding surface 8 of the member is in parallel with the facade element, as shown in figure 17. In the following an example of a method for mounting vertical profiles according to the invention is described. When a facade is being mounted on a building, a plurality of vertical profiles of the first type 30 is attached to the floors of the building. The vertical profiles are arranged on top of each other so that the longi- tudinal axes of the profiles are aligned, thereby forming columns of vertical profiles. A plurality of columns of vertical profiles is arranged in parallel and at a horizontal distance from each other, which essentially correspond to the width of the facade elements. Two neighbouring columns of vertical elements 30 are arranged so that the slots are facing each other. Facade elements 41 are mounted between two neighbouring columns of profiles. The mounted facade elements are supported by vertical profiles of the second type 46, which have been entered into the outer parts of the slots of the vertical profiles of the first type. The vertical profiles of the first and second type are mounted so that they are allowed to receive the facade element from below and to support the edges of the facade element when the facade element is transported to the mounting position.

The attachment members 1a-b of the tool are designed to attach the tool to a vertical profile 30 arranged on the building. The tool is to be mounted with the axes 3a-b horizontally directed and in parallel to the surface of the facade element. Figure 8 illustrates how the tool is inserted into the notches 44 of one or more of the supporting profiles 42 of a vertical profile 30 of the first type, which has been mounted on the building. The upper part 12 of the tool, including the upper member 2a, is attached to the profile. Figure 9 illustrates how the lower part 13, including the lower member 2b, is moved downwards in the supporting profile until it reaches a lower part of the vertical profile 30 and the transmission units 7a-b are stretched. The transmission unit ensures a parallel movement of the facade element relative the vertical profiles. Accordingly, the upper member 2a is positioned at an upper part of the vertical profile and the lower member 2b is positioned at a lower part of the vertical profile. One tool is mounted on each of the two vertical profiles arranged neighbouring each other for supporting the facade element, as shown in figure 10.

In the following, the mounting of the facade element will be ex- plained with reference to the figures 10-17. Figures 10 and 11 show how the facade element is moved upward towards the mounting position and figures 12 and 13 show how the upward movement of the facade element affects the members so that they are turned into a working position. Figures 14 and 15 show how the facade element is moved downward at the same time as the tools push the facade element towards the building. Figures 16 and 1 7 show the facade element i n its fi nal mounting position .

The facade element 41 is moved u pward , g uided by the outer part 39 of the slots , unti l it comes i nto contact with the lower members 2b of the tools, as shown in figures 10 and 1 1 . When the facade element 41 comes into contact with the lower members 2b, the facade element will rotate the members so that the contact between the facade element and the members are made where the members have their smallest radius r, and accordingly the facade element without hindrance can pass by the members, which surfaces slide against the facade element. The facade element is further moved upward to a position above the final mounting position , wh i le th e u pwa rd movement of the facade element affects the tools so that the members are rotated i n a first direction until the facade element is in contact with the curved surface 6 at the minimum radius r, as shown i n figure 12 and 13. Thus, the upward movement of the facade element affects the members 2a-b so that the members are turned into a working position, i .e. the members are rotated until they reach their smallest radius, i .e. the mi nimum radius r, as shown i n figure 13.

Thereafter, the facade element 41 is lowered towards the final mounting position , as shown in figure 14 , and at the same time the members 2a-b are driven to push the facade element towards the i nner part 38 of the slots. While the facade element is moved downwards towards the fi nal mounting position, the facade element is in contact with the curved surface 6 thereby causing the members 2a-b to rotate in a direction opposite the first direction until the facade element is in contact with the curved surface 6 at the maximum radius R of the member. The members are caused to rotate to their largest radius, i .e. the maximum radius R, by the movement of the facade element, as shown i n fig u re 1 5. When they are rotated , the mem bers 2a-b push the facade element towards the inner part 38 of the slot. When the members have reached their largest radius the facade element is close to the final mounting position, and the facade element is vertically moved , as shown in figure 16 and 1 7, until fasten i n g u n its on th e facad e element a re eng aged to corre- sponding fastening elements on the vertical profiles or on a floor of the building , and thereby the facade element is attached to the floor of the building . The facade element is now positioned in the inner parts of the slot. The members 2a-b have lost contact with the facade element and the tools can be removed from the vertical profile.

The members are designed so that the members rotate due to friction when they are in contact with the facade element when the facade element is moved downwards. The facade element is moved downwards due to its own weight when the gravity force is acting on the element. Accordi ngly, the dead weight of the facade element is used to achieve the force needed to move the facade element from the outer to the inner part of the slots. Figu re 1 8 shows a perspective view of a tool for mou nti ng facade elements according to a fourth embodiment of the i nvention. Figure 19 shows the tool in a view from above. The tool comprises a frame 50 includi ng part 51 for attaching the frame in a fixed position with respect to a building . I n this embodiment the part 51 is designed to attach the tool to a vertical profile 30 arranged on the build ing . The frame 50 further comprises a rod 52 arranged i n parallel with the part 51 and a framework 53 arranged between the part 51 and the rod 52 to keep them i n a fixed relation relative each other.

The tool further includes members 54 arranged to be engaged to the facade element while the facade element is lowered . I n the embodiment shown i n figure 18 and 19 the tool includes two members 54, each arranged on an opposite side of the frame part 51 . The member 54 i ncludes two wheels 58a-b havi ng outer surfaces 59 designed to be in contact with the facade element. However, the wheel is optional . The surface 59 can be arranged in other ways. The member 54 further includes an upper and a lower lever 60a-b operatively connected to the surfaces 59 of the wheels 58a-b. Each of the levers is rotationally arranged with respect to the frame about an axis 62a-b to be horizontally directed when the frame is in the fixed position . Each of the wheels 58a-b are attached to an end portion of the levers 60a-b, and an opposite end portion of the lever is rotatably connected to the rod 52. The lever 60 is configured to rotate about the axis 62 in a first direction when the facade element is lowered . The outer end portion of the lever incl uding the surface 59 is adapted to rotate between a position above the horizontal plane and a position below the horizontal plane. The surfaces 59 are arranged in parallel with the axes 62a-b. The member 54 further comprises a beam 63 extendi ng between the two levers 60a-b. The beam 63 is arranged so that it is always in parallel with the frame parts 51 and 52. The wheel 58a and the lever 60a are rotatably connected to the beam 63 about a common axis 65. The wheel 58b and the lever 60b are rotatably connected to the beam 63 about a common axis, which is in parallel with the axis 65. The beam 63 extends above the upper wheel 58a and the lever 60a.

Each of the members 54 comprises a locking mechanism includ- ing a hook 56 for mechanically locking the member 54 to the facade element. The hook 56 is arranged in the upper end of the beam 63. The locking mechanism is arranged so that the hook 56 is automatically disengaged when the outer end portion of the level 60a has passed the horizontal plane. The member 54 further comprises a spri ng arrangement i ncl ud i ng a spri n g 64 arranged between the upper lever 60a and the beam 63. The spring 64 is arranged to force the levers 60a-b to rotate in a direction opposite the first direction when the hook has been disengaged . The function of the tool will now be descri bed with reference to the figures 20a - g . The tool is to be mounted with the axes 62a- b horizontally directed , and in parallel with the surface of the facade element to be mounted . The frame part 51 of the tool is inserted into notches of a vertical profile 30, wh ich has previously been mounted on the building , as shown in figures 1 9 and 20a . The spri ng 64 holds the lever 60a-b in a starting position . The facade element 41 is moved upward , as shown in figure 20b, guided by the outer part of the slots of the vertical profile 30, until it comes into contact with the lower lever 60b of the tool . The facade element then swivels the members 54 away from the building as shown in figure 20b. At the same time the spring 64 is compressed . When an edge of the facade element, or a device 68 having a protruding part 70 temporarily attached on the facade element 41 , passes the hook 56, the protruding part 70 and the hook lock into each other as shown in figure 20c. This means that the member 54 of the tool is engaged to the facade element. Thereafter, the facade element 41 is lowered towards the final mounti ng position, as shown i n figure 20d . At the same time, the engagement between the facade element and the member 54 forces the levers 60a-b to rotate about the horizontal axis 62, while the surfaces 59 of the wheels 58a-b are in contact with the facade element thereby forcing the member 54 to push the facade element towards the building , as shown in figure 20d-e. At the same time the spring 64 is stretched . At the moment when the levers 60a-b passes the horizontal plane, as shown i n figure 20e, the facade element connects to the building , which forces the facade element to move straight down towards its final position. When the facade element is in its final position, and the outer end portion of the lever is below the horizontal plane as shown in figure 20f, the hook 56 is automatically disengaged from protrud ing part 70 , and thereby enabling the spri ng 64 to rotate the levers 60a-b back to its original starti ng position as shown i n figure 20g . The present invention is not limited to the embodiments disclosed but may be varied and modified withi n the scope of the following claims. For example, the lever can have different shapes , and th e tool may be u sed in combination with other types of vertical profiles. Further, the engagement between the curved surface of the member and the facade element can be made by other means than friction, such as by means of gears or teeth provided on the curved surface of the member and cor- responding gears or teeth provided on the facade element.