Ladder lift and method for operating a ladder lift

Abstract

The invention relates to a ladder lift (1) for transporting a load (2), wherein the ladder lift (1) comprises a sliding ladder (3), wherein the sliding ladder (3) comprises as ladder units (4-6) a floor ladder (7) and at least one extension ladder (8, 9), wherein the ladder lift (1) comprises a first carriage unit (10) and a drive unit (13), wherein the first carriage unit (10) can be moved independently of an extended state of the sliding ladder () by means of the drive unit (13) from a lower end (14) of the sliding ladder (3) to an upper end (15) of the sliding ladder (3) and vice versa, wherein the ladder lift (1) additionally comprises one of the number of extension ladders (8;9) comprises a corresponding number of additional slide units (11), each of the ladder units (4-6) forming an action unit (16-18) in the form of a rail guide (19-20) with its associated slide unit (10-12), such that the associated slide unit (10-12) is held linearly displaceable on this ladder unit (4-6) along a longitudinal extension (L4-L6) of this ladder unit (4-6). (Figure 1);

Description

[0001] The invention relates to a ladder lift for transporting loads according to claim 1 and a method for operating a ladder lift according to claim 9.

[0002] From US patent 2015 / 0275579A1, an elevator for traversing a double ladder is known, wherein the elevator: comprises a housing configured to move along a longitudinal axis of a double ladder, the double ladder comprising a first and a second ladder, the first ladder and the second ladder being configured to connect adjustably to form an overlap section, the housing being configured to form a first position while engaged with the first ladder, the housing further being configured to form a second position while engaged with the second ladder, and the housing further being configured to form an overlap position while engaged with the overlap section.

[0003] From DE 196 07 983 A1, a load transport trolley for an inclined load lift is known, which has the following features: a support and holding device for holding a load to be transported; a first guide device which is attached to the support and holding device in such a way that it can engage with the ladder stiles of a first fixed part of an extendable ladder in order to enable a guided movement of the support and holding device along the ladder stiles of the fixed part of the extendable ladder; a second guide device which is attached to the support and holding device and is arranged offset from the first guide device in such a way that it can engage with the ladder stiles of a second extendable part of the extendable ladder in order to enable a guided movement of the support and holding device along the ladder stiles of the extendable part of the extendable ladder.

[0004] From DE 10 2013 103 595 A1, a ladder with a load transport means is known, which consists of one or more ladder sections that can be moved relative to each other or extended telescopically, wherein the stiles of the ladder sections are connected to each other via ladder rungs, wherein a load transport means is movable on at least four roller elements along the stiles at the front of the stiles, wherein the roller elements have at least three star-shaped arranged support rollers and wherein the roller elements are rotatable about their central axis.

[0005] The object of the invention is to propose a ladder lift for transporting loads and a method for operating a ladder lift, which simplifies the transport of the ladder lift as well as the assembly and disassembly of the ladder lift, or which enables reliable transport.

[0006] This problem is solved by means of the characterizing features of claim 1 and 9, respectively, starting from the features of the preamble. Advantageous and expedient embodiments are specified in the respective dependent claims.

[0007] The ladder lift according to the invention for transporting loads comprises a sliding ladder, wherein the sliding ladder comprises a base ladder and at least one extension ladder as ladder units, wherein the ladder lift comprises a first carriage unit and a drive unit, wherein the first carriage unit can be moved by means of the drive unit from a lower end of the sliding ladder to an upper end of the sliding ladder and vice versa, independently of an extended state of the sliding ladder, wherein the ladder lift comprises, in addition to the first carriage unit, a number of additional carriage units corresponding to the number of extension ladders, and wherein each of the ladder units with its associated carriage unit forms an operating unit in the form of a rail guide (in particular, a roller guide).The associated carriage unit is linearly displaceable along the longitudinal length of the ladder unit. By using a number of carriage units corresponding to the number of ladder units, the need for a highly complex carriage unit capable of moving on all ladder units is avoided. This significantly simplifies the design of the ladder lift and makes it better suited to the demanding conditions encountered on construction sites.

[0008] It is also possible to equip the ladder lift with a load-bearing device, with the load-bearing device being connected to the first carriage unit. This allows the load to be transported reliably and safely.

[0009] Furthermore, it may be possible to arrange the drive unit between the first sliding unit and the extension ladder, with the drive unit being located particularly at one upper end of the extension ladder. By designing such a head section, the sliding unit of the floor ladder can be moved along the entire length of the extension ladder.

[0010] It can also be provided that the drive unit is equipped with a traction element connected to the extension ladder and to the first carriage, and in particular, that the drive unit is further equipped with a gearbox, a pulley, and a self-contained drive, wherein the gearbox preferably includes a slip clutch and wherein the self-contained drive is preferably designed as a cordless screwdriver. This results in a simple design for the drive unit, ensuring the necessary basic functions. It can also be provided that the gearbox is equipped with a backstop in addition to the slip clutch.

[0011] Furthermore, it may be provided that, after the first sled unit, guided on the floor ladder, has moved onto the second sled unit, guided on the first extension ladder, the first sled unit and the second sled unit are detachably connected to each other in such a way that the first sled unit is supported by the second sled unit and can be moved along the first extension ladder by means of the second sled unit, with the first sled unit and the second sled unit forming a double sled on the first extension ladder. This allows the first sled unit to also move along the first extension ladder.

[0012] It may also be provided that each of the carriage units is equipped with a body and a roller and / or sliding device connected to the body, wherein the roller and / or sliding device is arranged between the body and the ladder unit, and wherein it is particularly provided that the carriage unit is guided on the stiles of the associated ladder unit in the upward direction (x) and in the downward direction (x') by means of the roller and / or sliding device, and / or wherein it is particularly provided that the roller and / or sliding device comprises double tapered rollers and / or tapered rollers and / or running rollers with flanges arranged on one or both sides, which roll on the upper sides of the stiles when the carriage unit is moved, and comprises double tapered rollers and / or tapered rollers and / or running rollers with flanges arranged on one or both sides, which roll on the undersides of the stiles when the carriage unit is moved.and / or that it is particularly provided that the first sliding assembly comprises at least one guide device, in particular a receiving part, within its body, and that the second sliding assembly comprises at least one counter-guide device, in particular an insertion part, corresponding to the guide device, outside its body, wherein the guide device and the counter-guide device also form a centering device when interacting together, and / or that it is particularly provided that the second sliding assembly, in a parked position, preferably rests with its body and in particular a stop of its body on the floor ladder, and / or that it is particularly provided that all sliding assemblies, if they travel together on the extension ladder, are mechanically locked to each other by a separating lock in such a way that the sliding assemblies are not locked both during an upward movement,as well as during a downward movement, whereby it is specifically provided that the respective locking mechanism is unlocked by the carriage unit traveling directly on the sliding ladder unit approaching the ladder unit below it. Appropriately designed variants ensure reliable operation of the ladder lift.

[0013] Furthermore, it may be possible to dimension the receiving space of the first sled unit in such a way that that the second sled unit is fully enclosed therein, in particular when the first sled unit is on the first extension ladder, and that the first sled unit is supported by the second sled unit when the first sled unit is on the second ladder section above a first overlap area in which the first ladder section and the second ladder section run parallel to each other, and that – if the extension ladder of the ladder lift includes a third ladder unit – a receiving space for the second sled unit is dimensioned such that the third sled unit is fully enclosed therein when the second sled unit is on the second extension ladder, and that – if the extension ladder of the ladder lift includes a third ladder unit – the first sled unit and the second sled unit are supported by the third sled unit.if the first and second sled units are located on the third ladder section above a second overlap area in which the second and third ladder sections run parallel to each other, and if the ladder lift's extension ladder includes a fourth ladder unit, a receiving space for the third sled unit is dimensioned such that the fourth sled unit is completely contained therein when the third sled unit is located on the third extension ladder, and if the ladder lift's extension ladder includes a fourth ladder unit, the first and second sled units and the third sled units are supported by the fourth sled unit when the first and second sled units and the third sled units are located on the fourth ladder section above a third overlap area.in which the third conductor section and the fourth conductor section run parallel to each other. This means that the ladder lift remains compact in its dimensions even when two or more sled units are moved together.

[0014] It may also be possible to form a tunnel through the body of the second carriage unit and – if present – ​​the third carriage unit and – if present – ​​the fourth carriage unit, through which the traction element of the drive unit is guided. This also ensures a compact design of the ladder lift.

[0015] The inventive method for operating a ladder lift according to at least one of claims 1 to 8 provides for the first carriage unit and the second carriage unit to be detachably coupled to one another in an overlap area of ​​the floor ladder and the extension ladder such that the first carriage unit is moved over the extension ladder with the second carriage unit positioned between it during upward and downward travel. This ensures that the ladder lift remains compact in its dimensions even when two or more carriage units are moved together.

[0016] Furthermore, it may be provided that, when ascending the extended ladder, the first carriage unit, provided the ladder is at least two sections long, travels along the base ladder in a first step, maintaining direct contact with it. In a second step, in an overlap area where the base ladder overlaps with the extension ladder following it, the carriage unit moves onto the second carriage unit in such a way that the second carriage unit is picked up by the first, forming a double carriage. In a third step, the second carriage unit is carried along during the further ascent and is guided by the first extension ladder by the second carriage unit. This ensures a safe procedure on all ladder sections.

[0017] It may also be provided that the second sliding unit is mechanically locked to the first sliding unit for upward travel on the first extension ladder, in particular by lifting the second sliding unit away from the first ladder unit using the first sliding unit. Furthermore, it may be provided that the second sliding unit is mechanically unlocked from the first sliding unit after downward travel on the first extension ladder, in particular by driving the second sliding unit onto the floor ladder. This ensures a secure connection between the first and second sliding units and, in particular, prevents the carried sliding unit from leaving the sliding unit in direct contact with the extension ladder during downward travel.

[0018] Furthermore, it may be possible to arrange for the double carriage – provided the extension ladder has at least three sections – in a fourth step, within a second overlap area where the first extension ladder overlaps with a second extension ladder following the first, to move onto a third carriage unit in such a way that the third carriage unit is picked up by the second carriage unit, forming a triple carriage. In a fifth step, the third carriage unit is then carried along during further upward movement and guided by the second extension ladder using the third carriage unit. This ensures a safe procedure on all ladder sections.

[0019] It may also be provided that the third sliding unit is mechanically locked to the second sliding unit for upward travel on the second extension ladder, in particular by lifting the third sliding unit from the first extension ladder using the first and second sliding units. Furthermore, it may be provided that the third sliding unit is mechanically unlocked from the second sliding unit after downward travel on the second extension ladder, in particular by driving the third sliding unit onto the first extension ladder. This ensures a secure connection between the second and third sliding units and, in particular, prevents the sliding unit being carried from leaving the sliding unit in direct contact with the extension ladder during downward travel.

[0020] Furthermore, it may be provided that, in a sixth step, the triple-section sliding platform – provided the extension ladder has at least three sections – is moved onto a fourth sliding platform in a third overlap area where the second extension ladder overlaps with a third extension ladder following the second, such that the fourth sliding platform is picked up by the third sliding platform, forming a quadruple-section sliding platform. In a seventh step, the fourth sliding platform is then carried along during the further upward movement and guided by the third extension ladder using the fourth sliding platform. This ensures a safe procedure on all ladder sections.

[0021] It may also be provided that the fourth sliding unit is mechanically locked to the third sliding unit for upward travel on the third extension ladder, in particular by lifting the fourth sliding unit from the second extension ladder using the first, second, and third sliding units. Furthermore, it may be provided that the fourth sliding unit is mechanically unlocked from the third sliding unit after downward travel on the third extension ladder, in particular by driving the fourth sliding unit onto the second extension ladder. This ensures a secure connection between the third and fourth sliding units and, in particular, prevents the sliding unit being carried from leaving the sliding unit in direct contact with the extension ladder during downward travel.

[0022] Further details of the invention are described in the drawing with reference to schematically illustrated embodiments.

[0023] This shows: Figure 1: a schematic side view of a first embodiment of the ladder lift according to the invention; Figure 2: another schematic side view of the first embodiment, showing the carriage units in a plurality of travel positions; Figure 3: a view of the first embodiment from a lower end of the extension ladder towards an upper end of the extension ladder; Figure 4: a detail of the Figure 3 corresponding to section line IV-IV; Figure 5: a schematic view of a second embodiment in an analogous manner to the Figure 3 executed view; Figure 6: a schematic side view of the Figure 5 in the direction of arrow VI.

[0024] In the Figure 1Figure 1 shows a first embodiment of the ladder lift 1 according to the invention for transporting a load 2 in a schematic side view. The ladder lift 1 comprises a sliding ladder 3, wherein the sliding ladder 3 includes, as ladder units 4, 5, 6, a ground ladder 7, a first extension ladder 8, and a second extension ladder 9. Figure 1 A building G is also shown, against which the sliding ladder 3 of the ladder lift 1 is leaning. The load 2 can be formed, for example, by building materials or by one or more PV modules.

[0025] Furthermore, the ladder lift 1 comprises a first carriage unit 10, a second carriage unit 11, a third carriage unit 12, and a drive unit 13. The first carriage unit 10 can be moved independently of the extension state of the extension ladder 3 by means of the drive unit 13 from a lower end 14 of the extension ladder 3 to an upper end 15 of the extension ladder 3 and vice versa. In the Figure 1 The sliding ladder 3 is shown in a fully extended position A3-1. The ladder lift 1 comprises one carriage unit 10, 11, 12 for each ladder unit 4, 5, 6.

[0026] Each of the ladder units 4, 5, 6, together with its associated carriage unit 10, 11, 12, forms an operating unit 16, 17, 18 in the form of a rail guide 19, 20, 21. Accordingly, the respective carriage unit 10, 11, 12 associated with each ladder unit 4, 5, 6 is linearly displaceable along a longitudinal extension L4, L5, L6 of this ladder unit 4, 5, 6. The rail guides 19, 20, 21 are each designed as roller guides. The ladder lift 1 is intended to be positioned against the building G at an angle α of at least 60° and at most 90°. The ladder lift 1 can be secured to the building G and / or a surface U by tension straps and / or support bars (not shown).

[0027] The ladder sections 4, 5, 6 are slidable relative to each other, as in a conventional extension ladder, so that the overall length of the extension ladder 3 can be varied. The first extension ladder 8 can be locked to the base ladder 7 in a variety of positions, with the distance between successive locking positions being determined by rungs 7a, 8a, 9a (see Figure 3 ) can be specified. In each of the locking positions, at least one of the rungs 8a of the first extension ladder 8 can be locked to at least one of the rungs 7a of the floor ladder 7, e.g., by means of a claw pivotably attached to the first extension ladder 8. Similarly, the second extension ladder 9 can also be locked to the first extension ladder 8 in a multitude of positions.

[0028] The successive ladder units 4, 5, 6 overlap even when the extension ladder 3 is fully extended. Thus, the ground ladder 7 and the first extension ladder 8 overlap in a first overlap area 25, and the first extension ladder 8 and the second extension ladder 9 overlap in a second overlap area 26.

[0029] To accommodate the aforementioned load 2, the ladder lift comprises a support device 27, wherein the support device 27 is connected to the first carriage unit 10.

[0030] The drive unit 13 is connected to the first carriage unit 10 via a traction element 29 and is located at the upper end 15 of the second extension ladder 9, the extension ladder 9 being the extension ladder furthest from the base ladder 7. The drive unit 13 forms a head section 28 of the extension ladder 3. The traction element 29 is designed as a pull cord 30. In addition to the traction element 19, the drive unit 13 includes a pulley 31, onto which the pull cord 30 is wound when the first carriage unit 10 moves upwards in an upward direction x, and from which the pull cord 30 is unwound when the first carriage unit 10 moves downwards in a downward direction x'. The pull cord 30 is guided through the second carriage unit 11 and the third carriage unit 12. Thus, it can be wound and unwound freely by the second and third carriage units 11 and 12.With regard to the power flow, the drive unit 13 is arranged – as mentioned above – between the first carriage unit 10 and the extension ladder 3. In order to be able to move the carriage units 10, 11, 12 over the entire length of the extension ladder 3 by means of their traction element 29, the drive unit 13 is arranged at the upper end 15 of the extension ladder 3.

[0031] To drive the pulley 31, the drive unit 13 comprises a self-contained drive 32 and a gearbox 33, which is connected between the self-contained drive 32 and the pulley 31. Furthermore, a slip clutch 34 can be connected between the self-contained drive 32 and the pulley 31, thus preventing overloading of the drive unit 13 when the first carriage unit 10, for example, on the extension ladder 3, has been raised to its highest position and is in contact with the drive unit 13. According to an embodiment not shown, a backstop can also be provided, which is connected between the gearbox and the self-contained drive. The self-contained drive 32 is designed as a cordless screwdriver 35. Cordless screwdrivers are generally available in large numbers on a construction site.

[0032] In the Figure 2The ladder lift 1 is shown again in a side view. In this view, the three carriage units 10, 11, 12 are compared with the Figure 1 The units are shown not only in their respective parked positions P10, P11, and P12, but also in various driving positions, indicated by dashed lines. The first sled unit 10 is shown in a first driving position F10-1, in which it has already partially moved onto the second sled unit 11, which is in its parked position P11, and is thereby receiving it in a receiving space A10.

[0033] Furthermore, the first sled unit 10 is shown in a second driving position F10-2, in which it has picked up the second sled unit 11 in its receiving space A10, has detached itself from the floor ladder 7, and, carried by the second sled unit 11, continues as a double sled DPS on the first extension ladder 8 in the upward direction x towards the upper end 15 of the extension ladder 3. This is shown in the Figure 2 shown without the drive unit 13.

[0034] Furthermore, the first sled unit 10 is shown in a third driving position F10-3, in which it, together with the second sled unit 11, drives onto the third sled unit 12, which is in its park position P12, and thereby receives the second sled unit 11 in a receiving space A11 and thus also in its receiving space A10.

[0035] Finally, the first sled unit 10 is shown in a fourth driving position F10-4, in which it has received the second sled unit 11 and the third sled unit 12 in its receiving space A10 and travels as a triple sled DRS on the second extension ladder 9. The triple sled DRS is decoupled from the ground ladder 7 and from the first extension ladder 8. The first sled unit 10 is supported by the third sled unit 12 with the second sled unit 11 positioned between them. In this position, the third sled unit 12 travels upwards on the second extension ladder 9 in the direction x towards the upper end 15 of the extension ladder 3. In the fourth driving position F10-4, the second sled unit 11 is decoupled from the first extension ladder 8 and supported by the third sled unit 12.

[0036] During the downward movement in downward direction x', the third sled unit 12 initially remains on the second exit ladder 9, as it is connected to a stop 12a (see Figure 1 ) against the first exit ladder 8. Accordingly, the third sled unit 12 no longer continues its downward journey and remains behind on the second exit ladder 9. As soon as the third sled unit 12 comes to a stop, the second sled unit 11 is already fully guided back onto the first exit ladder 8, so that it can continue its downward journey together with the first sled unit 10.

[0037] During the further course of the downward movement in downward direction x', the second sled unit 11 then remains behind on the first exit ladder 8, since it is connected to a stop 11a (see Figure 1) against the floor ladder 7. Accordingly, the second carriage unit 11 no longer travels downwards and remains on the first exit ladder 8. As soon as the second carriage unit 11 comes to a stop, the first carriage unit 10 is already fully guided back onto the floor ladder 7, so that it can continue downwards on its own.

[0038] The aforementioned stops 11a, 12a of the sled units 11 and 12 are shown only in the following for the sake of clarity. Figure 1 depicted.

[0039] From the Figure 2 It is evident how the pull cord 30 passes unhindered through the receiving spaces A10 and A11 and A12 of the sled units 10, 11, 12 during the movement of the sled unit 10, and also allows the receiving of the second sled unit 11 in the first sled unit 10 and the third sled unit 12 in the second sled unit 11.

[0040] In the Figure 3is a view of the in the Figure 1 ladder lift 1 shown in direction III (see Figure 1 ) shown, with reference to a representation of the drive unit 13 (see Figure 1 ) was waived in order to Figure 3 to keep it clear and only the left half of the resulting view is shown. The ladder lift 1 is in relation to the one in the Figure 3 The components shown are designed to be mirror-symmetrical to its longitudinal center plane LME1.

[0041] From the version executed with a higher level of detail Figure 3 It can be seen that all ladder units 4, 5, 6 have in each of their stiles 36, 37, 38 a groove 22, 23, 24 running in the longitudinal direction L3 of the sliding ladder 3, which leads to a lower end 36a, 37a, 38a and an upper end 36b, 37b, 38b (see Figure 1 ) of the respective spar 36, 37, 38 is open.

[0042] The first slide unit 10 is guided by two sliding fingers 39, 40 in the groove 22 of the left stile 36 of the floor ladder 7 and by two further sliding fingers in the groove of the right stile of the floor ladder. The first slide unit 10 also includes two left rollers 42, 43, which rest on a top surface 36c of the left stile 36 of the floor ladder 7, and two right rollers, which rest on a top surface of the right stile of the floor ladder. In addition to a roller and / or sliding unit 44a comprising the sliding fingers 39, 40 and the rollers 42, 43, the first slide unit 10 also includes a body 44b. The aforementioned rollers 42, 43 are rotatably mounted on this body 44b, and the aforementioned sliding fingers 39, 40 are attached to this body. The body 44b of the first slide unit 10 also includes the receiving space A10.This is designed as a kind of tunnel, dimensioned such that the second sled unit 11 can be completely accommodated within it. Furthermore, the first sled unit 10 includes a guide device 45. This guide device projects into the receiving space A10 in such a way that it interacts with a counter-guide device 46 of the second sled unit 11 as a coupling 47. This ensures that the first and second sled units 10, 11 are aligned with each other when the first sled unit 10 approaches the second sled unit 11, and that the first sled unit 10 carries the second sled unit 11 along during an upward movement after the second sled unit 11 is completely accommodated in the receiving space A10 of the first sled unit 10. A second coupling is arranged symmetrically to the longitudinal center plane LME1 of the ladder lift 1, so that the generation of lateral forces during the carrying of the second sled unit 11 is largely avoided.The pull cord 30 is connected to the body 44b of the first slide unit 11 via a holder (not shown). A sectional view through the coupling 47, which corresponds to one in the . Figure 3 The section line shown, IV-IV, runs through it. Figure 4The guide device 45 comprises a plate 45a with a bore 45b. The counter-guide device 46 comprises a plate 46a and a centering cone 46b. The centering cone 46b is attached to the plate 46a and points in the downward direction x'. The plates 45a, 46a are aligned on the first and second slides 10, 11, respectively, such that the cone 46b is received in the bore 45b when the first slide unit 10 moves onto the second slide unit 11, and that the first slide 10 carries the second slide 11 on the plates 45a of its guide devices 45 as it continues its upward movement in the upward direction x, and is thereby aligned with the second slide 11. The counter-guide device 46 is arranged on a body 49b of the second slide unit 11.

[0043] According to an embodiment not shown, the slide unit can also be guided by several pairs of rollers on the left and right side rails.

[0044] It is further stipulated that the guide device and the counter-guide device are interlocked by a separating lock as long as the first carriage unit is supported by the second carriage unit. Such a separating lock can, for example, comprise a spring-loaded lever mechanism, which is controlled by the position that the carriage unit assumes relative to the ladder unit on which it travels. Thus, a separating lock of the second carriage unit is, for example, controlled by contact of the lever mechanism with the floor ladder. If a third carriage unit is present, a separating lock of the third carriage unit is, for example, controlled by contact of the lever mechanism with the first extension ladder.

[0045] The second carriage unit 11 is guided analogously to the first carriage unit 10 by two sliding fingers 50, 51 in the groove 23 of the left stile 37 of the first extension ladder 8 and by two further sliding fingers in the groove of the right stile of the first extension ladder. Furthermore, the second carriage unit 11 comprises two left rollers 52, 53, with which it rests on a top surface 37c of the left stile 37 of the first extension ladder 8, and two right rollers, with which it rests on a top surface of the right stile of the first extension ladder. In addition to a roller and / or sliding unit 49a comprising the sliding fingers 50, 51 and the rollers 52, 53, the second carriage unit 11 also includes the aforementioned body 49b. The rollers 52, 53 are rotatably mounted on this body 49b, and the sliding fingers 50, 51 are attached to this body 49b. The body 49b of the second slide unit 11 also includes the recording chamber A11.This is designed as a kind of tunnel, dimensioned such that the third sled unit 12 can be accommodated within it. Furthermore, in addition to the aforementioned counter-guiding device 46, the second sled unit 11 includes a guide device 54. This guide device projects into the receiving space A11 in such a way that it interacts with a counter-guiding device 55 of the third sled unit 12 as a coupling 56, such that the second and third sled units 11, 12 are aligned with each other when the second sled unit 11 moves onto the third sled unit 12, and that the second sled unit 11 carries the third sled unit 12 along with it during an upward movement when the third sled unit 12 is completely accommodated in the receiving space A11 of the second sled unit 11.

[0046] A second coupling is arranged symmetrically to the longitudinal center plane LME1 of the ladder lift 1, so that the generation of lateral forces when carrying the third carriage unit 12 is largely avoided. The coupling 56 is identical in design to the coupling 46.

[0047] The third carriage unit 12 is guided analogously to the first carriage unit 10 by two sliding fingers 57, 58 in the groove 24 of the left stile 38 of the second extension ladder 9 and by two further sliding fingers in the groove of the right stile of the first extension ladder. Furthermore, the third carriage unit 12 comprises two left rollers 59, 60, with which it rests on a top surface 38c of the left stile 38 of the second extension ladder 9, and two right rollers, with which it rests on a top surface of the right stile of the first extension ladder. In addition to a roller and / or sliding unit 61a comprising the sliding fingers 57, 58 and the rollers 59, 60, the third carriage unit 12 also includes a body 61b. The aforementioned counter-guiding device 55 is arranged on this body 61b. The rollers 59, 60 mentioned above are rotatably mounted on this body 61b and the sliding fingers 57, 58 mentioned above are attached to this body 61b.The body 61b includes the receiving space A12, which is not designed to accommodate a further slide unit, but is only intended for the passage of the traction element 29. .

[0048] In the Figures 5 and 6 is analogous to the Figures 2 and 3 A second version of a ladder lift 101 is shown. This differs from the first version essentially in that the sliding ladder 103 of the ladder lift 101 comprises only two ladder units 104, 105 instead of three ladder units, and thus also only one first carriage unit 110 and one second carriage unit 111. Therefore, with regard to the Figure 5 The above description refers to Figure 3 referred.

[0049] In the Figure 6 The first slide unit 110 is analogous to the Figure 1The first carriage unit 110 is shown in various driving positions F110-1, F110-2, and F110-3. The second carriage unit 111 is also shown in a parking position P111. The first carriage unit 110 comprises a roller and / or sliding device 144a and a body 144b, with the rollers and sliding fingers of the roller and / or sliding device 144a indicated by dashed lines. The second carriage unit 111 comprises a roller and / or sliding device 149a and a body 149b, with the rollers and sliding fingers of the roller and / or sliding device 149a indicated by dashed lines.

[0050] With the driving position F110-1, the first sled unit 110 is shown moving towards the second sled unit 111 on a floor ladder 107 in the upward direction x.

[0051] With the driving position F110-2, the first sled unit 110 is shown as it has continued to move on the floor ladder 107 in the upward direction x and has already picked up about two-thirds of the second sled unit 111 with its receiving space A110.

[0052] In the driving position F110-3, the first sled unit 110 is shown as it has completely received the second sled unit 111 with its receiving space A110 and is carried by the second sled unit 111 as a double sled DPS on an extension ladder 108.

[0053] Furthermore, in analogy to the Figure 1 in the Figure 6A stop 111a of the second carriage unit 111 is shown, which rests against the floor ladder 107 as long as it is not being carried along in the upward direction x by the first carriage unit 110. When moving downwards in the direction x', the stop 111a prevents the second carriage unit 111 from continuing its downward movement with the first carriage unit 110.

[0054] According to one variant not shown, a sliding ladder can also include at least three extension ladders.

[0055] All described design variants can also be equipped with a traction element breakage protection system, which, in the event of a failure (e.g., a break in the traction element), brings the moving carriage unit(s), including any transported load, to a stop. For this purpose, a spring-loaded folding mechanism engages a latch, which stops the moving carriage unit at the nearest rung. The folding mechanism is triggered by the lack of tensile force on the traction element following a failure.

[0056] In all described design variants, a locking hook can be provided between each interacting slide unit. This prevents the upper slide unit from being displaced by the lower slide unit as it moves into it. This prevents the lower slide unit from unintentionally pushing the upper slide unit ahead of it, thus preventing the two slides from locking together. The locking hook disengages as soon as the lower slide unit is fully retracted. Reference symbol list

[0057] 1 Ladder lift 2 Load 3 Extension ladder 4-6 Ladder unit 7 Ground ladder of 3 7a Rung of 7 8 First extension ladder of 3 8a Rung of 8 9 Second extension ladder of 3 9a Rung of 9 10 First carriage unit 11 Second carriage unit 12 Third carriage unit 13 Drive unit 14 Lower end 14 of the extension ladder 3 15 Upper end 15 of the extension ladder 3 16-18 Actuating unit 19-21 Rail guide 22-24 Groove in stile 36, 37, 38 25 First overlap area of ​​3 26 Second overlap area of ​​3 27 Support device 28 Head of the extension ladder 3 29 Pulling element 29 of 13 30 Pull strap 31 Pulley of 13 32 self-sufficient drive of 13 33 gearbox of 13 34 slip clutch of 13 35 cordless screwdriver 12a stop of 12 to 8 11a stop of 11 to 7 36-38 shaft of 4, 5, 6 36a-38a lower end of shaft 36, 37, 38 36b-38 upper end of shaft 36, 37, 38, 36c top of shaft 36 37c top of shaft 37 38c top of shaft 38 39,40 sliding finger 41 not assigned 42,43 Left roller of 10 44a Roller and / or sliding unit of 10 44b Body of 10 45 Guide device of 10 45a Plate of 45 45b Bore of 45 46 Counter guide device of 11 46a Plate of 46 46b Centering cone of 46 47 Coupling from 45, 46 48 Not assigned 49a Roller and / or sliding unit of 11 49b Body of 11 50, 51 Sliding finger of 11 52, 53 Roller of 11 54 Guide device on 11 57, 58 Sliding finger of 12 59, 60 Roller of 12 61a Roller and / or sliding unit of 12 61b Body of 12 A3 Extension state of 3 (fully extended) A10 Reception space of 10 A11 Reception space of 11 A12 Reception space in 12 DPS Double slide DRS Triple slide F10-1 First travel position of 10 F10-2 Second travel position of 10 F10-3 Third travel position of 10 F10-4 Fourth travel position of 10 Building L3 Longitudinal direction of extension ladder 3 L4, L5, L6 Longitudinal extension of ladder unit 4, 5, 6 LME1 Longitudinal center plane of 1 P10-P12 Park position of 10, 11, 12 Ground A Angle of setup 101 Ladder lift 103 Extension ladder 104, 105 Ladder unit 107 Floor ladder 108 Extension ladder 110 First carriage unit 111 Second carriage unit 111a Stop of the second carriage unit 144a Roller and / or sliding unit of the first carriage unit 110 144b Body of the first carriage unit 110 149a Roller and / or sliding unit of the second carriage unit 111 149b Body of the second carriage unit 111 A110 Recording space of 110 F110-1 First driving positions of 110 F110-2 Second driving positions of 110 F110-3 Third driving positions of 110 P111 Parking position of 111 xUpward driving direction x'Downward driving direction

Claims

1. Ladder lift (1; 101) for transporting a load (2), - wherein the ladder lift (1; 101) comprises a sliding ladder (3; 103), - wherein the sliding ladder (3; 103) comprises as ladder units (4-6) a floor ladder (7) and at least one extension ladder (8, 9), - wherein the ladder lift (1; 101) comprises a first carriage unit (10) and a drive unit (13), - wherein the first carriage unit (10) is movable by means of the drive unit (13) from a lower end (14) of the sliding ladder (3; 103) to an upper end (15) of the sliding ladder (3; 103) and vice versa, independently of an extended state of the sliding ladder (3; 103), characterized by - thatThe ladder lift (1; 101) comprises, in addition to the first carriage unit (10), a number of additional carriage units (11; 12; 111) corresponding to the number of extension ladders (8; 9; 108), - wherein each of the ladder units (4-6; 103; 104) with its associated carriage unit (10-12; 110, 111) forms an operating unit (16-18) in the form of a rail guide (19-20), such that the associated carriage unit (10-12; 110, 111) is held linearly displaceable on this ladder unit (4-6; 103, 104) along a longitudinal extension (L4-L6) of this ladder unit (4-6; 103, 104).

2. Ladder lift according to claim 1, characterized by the fact that the ladder lift (1; 101) comprises a support device (27) for the load (2), wherein the support device (27) is connected to the first carriage unit (10; 110).

3. Ladder lift according to at least one of the preceding claims, characterized by the fact thatthe drive unit (13) is arranged between the first slide unit (10; 110) and the sliding ladder (3; 103), wherein the drive unit (13) is arranged in particular at an upper end (15) of the sliding ladder (3; 103).

4. Ladder lift according to at least one of the preceding claims, characterized by the fact that the drive device (13) comprises a traction element (29) which is connected to the extension ladder (3) and which is connected to the first carriage (10) and in particular it is provided that the drive device (13) further comprises a gearbox (33), a pulley (31) and an independent drive (32), wherein the gearbox (33) preferably comprises a slip clutch (34) and in particular a backstop and wherein the independent drive (32) is preferably designed as a cordless screwdriver (35).

5. Ladder lift according to at least one of the preceding claims, characterized by the fact thatAfter the first sled unit (10; 110) guided on the floor ladder (7; 107) has moved onto the second sled unit (11; 111) guided on the first extension ladder (8; 108), the first sled unit (10; 110) is detachably connected to the second sled unit (11; 111) in such a way that the first sled unit (10; 110) is supported by the second sled unit (11; 111) and can be moved on the first extension ladder (8; 108) by means of the second sled unit (11; 111), wherein the first sled unit (10; 110) and the second sled unit (11; 111) form a double sled (DPS) on the first extension ladder (8; 108).

6. Ladder lift according to at least one of the preceding claims, characterized by - thatEach of the slide units (10; 11; 12; 110, 111) comprises a body (44b; 49b; 61b) and a rolling and / or sliding device (44a; 49a; 61a) connected to the body (44b; 49b; 61b), wherein the rolling and / or sliding device (44a; 49a; 61a) is arranged between the body (44b; 49b; 61b) and the ladder unit (4-6; 104, 105) and - that It is particularly provided that the sled unit (10; 11; 12; 110, 111) is guided by means of the roller and / or sliding device (44a; 49a; 61a) in the upward direction (x) and in the downward direction (x') on the stiles (36-38) of the associated ladder unit (4-6; 104, 106) and / or - thatIt is particularly provided that a / the rolling and / or sliding device (44a; 49a; 61a) comprises double tapered rollers and / or tapered rollers and / or running rollers with flanges arranged on one or both sides, which roll on the upper surfaces (36c; 37c; 38c) of the beams (36-38) when the carriage unit (10; 11; 12) is moved, and comprises double tapered rollers and / or tapered rollers and / or running rollers with flanges arranged on one or both sides, which roll on the lower surfaces of the beams (36-38) when the carriage unit is moved, and / or - thatIt is particularly provided that the first slide assembly (10) comprises at least one guide assembly (45), in particular a receiving part, within its body (44b) and that the second slide assembly (11) comprises at least one counter-guide assembly (46), in particular an insertion part, outside its body (49) corresponding to the guide assembly (45), wherein the guide assembly (45) and the counter-guide assembly (46) also form a centering device when interacting together and / or - that It is particularly provided that the second sled unit (11) in a park position (P11) preferably rests with its body (49) and in particular a stop (11a) of its body (49) on the floor ladder (7) and / or - thatIt is particularly provided that all sled units (10; 11; 12), insofar as they travel together on the extension ladder (3; 103), are mechanically locked together by a separating lock in such a way that the sled units are connected both during an upward journey and during a downward journey, wherein it is particularly provided that the respective separating lock is unlocked by the sled unit (11; 12) traveling directly on the extension ladder (3; 103) driving onto the ladder unit (4; 5) following below it.

7. Ladder lift according to at least one of the preceding claims, characterized by - that a receiving space (A10) of the first sled unit (10) is dimensioned such that the second sled unit (11) is fully received therein, in particular when the first sled unit (10) is located on the first exit ladder (8) and - thatthe first sled unit (10) is supported by the second sled unit (11) when the first sled unit (10) is located on the second ladder section (5) above a first overlap area (25) in which the first ladder section (4) and the second ladder section (5) run parallel to each other and - that - provided that the sliding ladder (3) of the ladder lift (1) includes a third ladder unit (6) - a receiving space (A11) of the second carriage unit (11) is dimensioned such that the third carriage unit (12) is completely received therein when the second carriage unit (11) is located on the second extension ladder (9) and - that- provided that the sliding ladder (3) of the ladder lift comprises a third ladder unit (6) - the first carriage unit (10) and the second carriage unit (11) are supported by the third carriage unit (12), when the first carriage unit (10) and the second carriage unit (11) are located on the third ladder section (6) above a second overlap area (26) in which the second ladder section (5) and the third ladder section (6) run parallel to each other and - that - provided that the sliding ladder of the ladder lift includes a fourth ladder unit - a receiving space for the third carriage unit is dimensioned such that the fourth carriage unit is completely contained therein when the third carriage unit is on the third extension ladder and - that- provided that the sliding ladder of the ladder lift includes a fourth ladder unit - the first sled unit and the second sled unit and the third sled unit are supported by the fourth sled unit, if the first sled unit and the second sled unit and the third sled unit are located on the fourth ladder section above a third overlap area in which the third ladder section and the fourth ladder section run parallel to each other.

8. Ladder lift according to at least one of claims 4 to 7, characterized by the fact that a tunnel is formed through the body (49b; 61b) of the second sled unit (11) and - if present - the third sled unit (12) and - if present - the fourth sled unit, through which the traction element (29) of the drive device (13) is guided.

9. Method for operating a ladder lift according to at least one of claims 1 to 8, characterized by the fact thatthe first sled unit (10) and the second sled unit (11) are detachably coupled together in an overlap area (25) of the floor ladder (7) and the extension ladder (8) in such a way that the first sled unit (10) is driven over the extension ladder (8) during upward and downward travel with the second sled unit (11) in between.

10. Method for operating a ladder lift according to at least one of claims 1 to 8 and in particular according to claim 9, characterized by - thatWhen moving upwards on the extended extension ladder (3; 103) - the first sled unit (10), provided the extension ladder (3; 103) is at least two-part, o in a first step is moved along the base ladder (7) and is in direct contact with the base ladder (7), o in a second step in a first overlap area (25), in which the base ladder (7) overlaps with the extension ladder (8) following the base ladder, is driven onto the second sled unit (11) in such a way that the second sled unit (11) is picked up by the first sled unit (10) and a double sled (DPS) is formed, ∘ in a third step the second sled unit (11) is carried along during further upward movement and is guided by the second sled unit (11) on the first extension ladder (8).

11. Method according to claim 10, characterized by - thatthe second sled unit (11) is mechanically locked to the first sled unit (10) for an upward journey on the first extension ladder (8), in particular by lifting the second sled unit (11) off the first ladder unit (4) by means of the first sled unit (10) and - that the second sled unit (11) is mechanically unlocked from the first sled unit (10) after a downward journey on the first exit ladder (8), in particular by the second sled unit (11) being driven onto the floor ladder (7).

12. Method according to claim 10 or claims 10 and 11, characterized by - thatthe double sled (DPS), provided the extension ladder (3; 103) is at least three-section, ∘ in a fourth step in a second overlap area (26) in which the first extension ladder (8) overlaps with a second extension ladder (9) following the first extension ladder (8), is driven onto a third sled unit (12) in such a way that the third sled unit (12) is picked up by the second sled unit (11) and a triple sled (DRS) is formed, ∘ in a fifth step the third sled unit (12) is carried along during further upward movement and is guided by the third sled unit (12) on the second extension ladder (9).

13. Method according to claim 12, characterized by - thatthe third sled unit (12) is mechanically locked to the second sled unit (11) for an upward journey on the second extension ladder (9), in particular by lifting the third sled unit (12) from the first extension ladder (8) by means of the first and the second sled units (10; 11) and - that the third sled unit (12) is mechanically unlocked from the second sled unit (11) after a downward journey on the second extension ladder (9), in particular by the third sled unit (12) being driven onto the first extension ladder (8).

14. Method according to claims 10 and 12 or 10 and 11 and 12 and 13, characterized by - thatThe triple slide (DRS), provided the extension ladder has at least four sections, o in a sixth step in a third overlap area, in which the second extension ladder overlaps with a third extension ladder following the second extension ladder, is driven onto a fourth slide unit in such a way that the fourth slide unit is picked up by the third slide unit and a quadruple slide is formed, o in a seventh step the fourth slide unit is carried along during further upward travel and is guided by the fourth slide unit on the third extension ladder.

15. Method according to claim 14, characterized by - thatthe fourth sled unit is mechanically locked to the third sled unit for an upward journey on the third extension ladder, in particular by lifting the fourth sled unit from the second extension ladder by means of the first, second and third sled units and - that The fourth sled unit is mechanically unlocked from the third sled unit after a downward journey on the third exit ladder, in particular by driving the fourth sled unit onto the second exit ladder.

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