Device for fixing a carrying strap and lift system that grows therewith

Abstract

The invention relates to a device (36) for fixing a carrying strap (20) in a predetermined pulling direction (40). The carrying strap (20) is designed to support a lift car (14) of a lift system (10). The device (36) has: two retaining jaws (50) for clamping the carrying strap (20), wherein the carrying strap (20) is clamped between the retaining jaws (50) when the carrying strap (20) is arranged as intended and wherein at least one of the retaining jaws (50) is increasingly tapered in the pulling direction (40); and a holding jaw receptacle (52), which is arranged in front of the holding jaws (50) in the pulling direction (40) and which has a receiving recess (62) for receiving the holding jaws (50), which is open towards the holding jaws (50) and is increasingly tapered in the pulling direction (40), so that when the carrying strap (20) is arranged as intended between the retaining jaws (50) and when there is sufficient tension on the carrying strap (20) in the pulling direction (40), the retaining jaws (50) can be pulled at least as far into the retaining jaw recess by means of the carrying strap (20), that the retaining jaws (50) are arranged at least partially in the receiving recess (62) and that the retaining jaws (50) are pressed against one another due to the tapering of the receiving recess (62) and due to the tapering of the corresponding retaining jaw (54, 56), so that with a sufficient tensile length of the pull on the carrying strap (20) in the pulling direction (40), the carrying strap (20) is fixed in the retaining jaw receptacle (52) by means of the retaining jaws (50).

Description

[0001] DEVICE FOR FIXING A CARRYING STRAP AND

[0002] Growing elevator capacity

[0003] The present invention relates to a device for securing a carrying strap and a growing elevator system. The present invention particularly relates to a device for securing a carrying strap in a pulling direction, in particular in a predetermined pulling direction, and to a growing elevator system comprising the device.

[0004] Elevator systems are used to transport loads, such as people and / or goods, from one floor of a building to another. For this purpose, elevator systems generally have an elevator shaft that extends vertically within the building, for example, to connect the individual floors. On each floor, elevator shaft doors are typically located at the elevator shaft, each providing access to the elevator shaft. One or more elevator cars can be arranged in the elevator shaft so that they can be moved vertically from one floor to another.Furthermore, the elevator systems often have support means, such as steel cables or carrying belts, in other words carrying belts, which mechanically couple the corresponding elevator car to a drive machine of the elevator system, so that the elevator car can be displaced in the elevator shaft by means of the corresponding support means and the drive machine.

[0005] If a building is still under construction, especially if not all floors have been completed yet, it may be advisable to install a construction site lift system, for example an expandable lift system, to transport workers and construction materials to the higher floors that have already been completed. For this purpose, external lifts, particularly expandable external lifts, can be used, which are mounted on the outside of the building. For safety reasons, however, such external lifts are relatively slow compared to internal lifts. In addition, external lifts are exposed to the elements and can only be used to a limited extent or not at all in very bad weather. Furthermore, the operation of these external lifts generates noise, which is why they can only be used to a limited extent or not at all at night.Both the slow speed and the weather dependency and the limited usability at night can contribute to construction delays, which in turn are generally associated with increased costs.

[0006] A very good alternative that does not involve any of the problems of outdoor lifts discussed above is the climb lift, also known as a "jump lift." With such a climb lift, it is possible to suspend a machine platform of the elevator system, to which the drive motor of the elevator system is attached, at different heights within the elevator shaft depending on the current construction progress. The elevator car can be used to reach different floors of the building regardless of the height at which the machine platform is currently suspended. However, this may require the ability to vary the length of an active section of the corresponding support device.

[0007] An "active" section of the support means can be understood as a section of the support means that is subjected to the tensile force of the elevator car during normal operation of the scalable elevator system. In particular, the active section of the support means can extend from a first end of the support means, which is attached, for example, to the machine platform, via a counterweight to the elevator car and to a second end of the support means. Along the course of the support means, between the elevator car and the second end of the support means, a device can be arranged by means of which the active section of the support means can be lengthened or shortened as needed. This device can, for example, comprise a friction brake and / or a support means reservoir.

[0008] An "inactive" section of the support element, which is not subjected to the tensile force of the elevator car during normal operation of the scalable elevator system, is located from the elevator car along the path of the support element behind the friction brake and then extends to the support element reservoir, in which the second end of the support element can be located and / or secured. The length of the inactive section of the support element varies depending on the height level at which the climbing lift is located and the floors currently being reached by the climbing lift. The inactive section becomes shorter the longer the active section becomes, and vice versa.Such friction brakes are already known and are based on generating such a strong friction force between one or more components of the friction brake and the suspension element that a large portion of the weight force of the elevator car transmitted by the suspension element is transferred to the friction brake via the friction. The components can, for example, have one or more rollers and / or cylinders, some of which can be fixed and some of which can be rotatable. On a side of the friction brake facing away from the elevator car with respect to the course of the suspension element, the suspension element must be fixed in place so that the friction brake functions and the suspension element does not slip due to the friction brake. This serves as a safeguard in case undesirable slippage occurs in the friction brake.In the case of a steel cable as a load-bearing device, this fixation can be achieved simply by clamping the steel cable sufficiently tightly between two holding elements. However, in the case of a carrying strap, which can also be referred to as a carrying belt or simply a strap, this can be problematic, as the carrying strap can be damaged if it is clamped between the conventional holding elements. This can be particularly problematic if the carrying strap has a plastic coating that has a lower compressive strength than the carrying strap.

[0009] Furthermore, it can be problematic with such climbing lifts that there is naturally only limited space available in the elevator shaft, which makes it difficult to place the friction brake and / or one or more sufficiently large suspension element reservoirs for receiving at least part of the inactive section of the carrying belt, for example on the machine platform or in a shaft pit of the elevator shaft.

[0010] There may be a need, among other things, for a device for securing a carrying strap in a predetermined pulling direction that is compact and / or that protects the carrying strap and, in particular, does not damage it, even when a tensile force acts on the carrying strap in the pulling direction during operation of an elevator system that has the carrying strap as a support means of a lift car. Furthermore, there may be a need for the elevator system that has the device.

[0011] Such a need can be met with an object according to the independent patent claims. Advantageous embodiments are explained both in the dependent claims and in the following description. According to one aspect of the present invention, a device for fixing a carrying strap in a predetermined pulling direction is described. The carrying strap is designed to support an elevator car of a growing elevator system, in particular a climbing lift or jump lift. The device has: two holding jaws for clamping the carrying strap, wherein the carrying strap is clamped between the holding jaws when the carrying strap is arranged as intended, and wherein at least one of the holding jaws is increasingly tapered in the pulling direction;and a holding jaw receptacle which is arranged in front of the holding jaws in the pulling direction and which has a receiving recess for receiving the holding jaws, which is open towards the holding jaws and is increasingly tapered in the pulling direction, so that when the carrying strap is arranged as intended between the holding jaws and when there is sufficient tension on the carrying strap in the pulling direction, the holding jaws can be pulled into the receiving recess by means of the carrying strap at least far enough that the holding jaws are at least partially arranged in the receiving recess and that the holding jaws are pressed against one another due to the tapering of the receiving recess and due to the tapering of the corresponding holding jaw, so that when the carrying strap is pulled sufficiently long in the pulling direction, the carrying strap is fixed in the holding jaw receptacle by means of the holding jaws.

[0012] According to one aspect of the present invention, the scalable elevator system, in particular the climbing lift or the jump lift, is described. The scalable elevator system is used to transport a load, for example one or more people and / or goods, from one floor to another within a building under construction. The scalable elevator system has: an elevator car for receiving the load; an elevator shaft which becomes higher as the building's height increases during the construction phase, which extends at least from one floor to the other and in which the elevator car is displaceably arranged; a carrying belt which is mechanically coupled to the elevator car; a drive machine which is mechanically coupled to the carrying belt and which is designed to displace the elevator car in the elevator shaft by means of the carrying belt;a device for securing the carrying strap, for example, the device described above and below for securing the carrying strap in the predetermined pulling direction, wherein a portion of the carrying strap is arranged in the device, for example, as intended, between the holding jaws of the device; and a carrying strap reservoir, which, with respect to the path of the carrying strap, is arranged on a side of the device facing away from the elevator car and which is designed to receive a portion of the carrying strap that, with respect to the path of the carrying strap, is located on the side of the device for securing the carrying strap facing away from the elevator car.

[0013] As an alternative to the device for securing the carrying belt in the predetermined pulling direction, which has the holding jaws and is described above and below, the scalable elevator system can have a device for securing the carrying belt in the predetermined pulling direction, which has at least one wedge-shaped gap, such as the holding jaw receptacle, in which a roller is guided. In an operating state in which undesirable slippage occurs, the roller is moved upwards relative to the gap by means of the slipping carrying belt, whereby the carrying belt is clamped between the roller and a wall of the gap and thus secured. Thus, instead of one or two wedge-shaped holding jaws, one or two (holding) rollers can be used to secure the carrying belt in the device.

[0014] For example, a large part of the inactive section of the carrying strap can be arranged in the carrying strap reservoir. This inactive section can have a second end of the carrying strap. The carrying strap reservoir can, for example, have a drum that is rotatable and onto which the part of the carrying strap can be wound. The carrying strap reservoir allows the inactive section of the carrying strap that is not currently needed to be safely and carefully stowed away, for example by rolling the carrying strap onto the drum. The drum can, for example, be electrically and / or mechanically rotatable. The carrying strap reservoir also allows the active section of the carrying strap to be extended as needed, for example by unrolling the carrying strap from the drum.

[0015] When the carrying strap is arranged as intended, one of the holding jaws, for example a first holding jaw of the holding jaws, is arranged on a first side of the carrying strap and the other holding jaw, for example a second holding jaw of the holding jaws, is arranged on a second side of the carrying strap. The two holding jaws can be fastened to one another, for example screwed or clamped together. When the device is used as intended, the carrying strap is arranged as intended in the device and the carrying strap is subjected to a portion of the weight of the elevator car in the pulling direction, so that the elevator car pulls on the carrying strap in the pulling direction.The carrying belt can extend around one or more fixed rollers and / or rotating rollers, depending on the path of the carrying belt between the device and the elevator car. These rollers can at least partially absorb another portion of the weight of the elevator car, so that the carrying belt is not subjected to the entire weight. For example, a friction brake can be arranged between the device and the elevator car, depending on the path of the carrying belt. This friction brake can have rollers that can absorb a large portion of the force exerted on the carrying belt by the elevator car, and this is explained in more detail below.

[0016] In an initial state of the device, the carrying strap is not yet subjected to a tensile force in the pulling direction. In this initial state, the carrying strap can be positioned between the holding jaws as intended, and the holding jaws can be fastened to one another so that the carrying strap is clamped between the holding jaws with at least a slight contact pressure. This contact pressure should be at least large enough for the holding jaws to move in the pulling direction when the carrying strap is pulled, in particular, to be drawn into the receiving recess.

[0017] In one operating state of the device, in particular when the carrying strap slips due to the friction brake, the carrying strap is subjected to a tensile force in the pulling direction, in particular due to the weight of the elevator car. If, in the operating state of the device, both holding jaws rest against the corresponding wall of the receiving recess due to the pull caused by the tensile force and the pull is maintained, the two holding jaws are pressed together due to the tapering of the receiving recess and the corresponding holding jaw, since the space in the receiving recess becomes increasingly smaller due to the tapering of the receiving recess in the pulling direction. As a result, the contact pressure is so great that the carrying strap is reliably fixed in the device, even if at least part of the weight of the elevator car is held by the carrying strap and the carrying strap is pulled in the pulling direction.

[0018] The tension on the carrying strap is referred to as "sufficient" in this description when the holding jaws are pulled far enough into the receiving recess due to the corresponding tensile force that the holding jaws rest against the corresponding walls of the receiving recess. The tension length of the tension is referred to as "sufficient" in this description when the holding jaws are pulled far enough into the receiving recess due to the corresponding tensile force that the holding jaws are pressed together by the walls due to the tensile force in such a way that the carrying strap is reliably fixed in the holding jaw receptacle by means of the holding jaws and thus reliably fixed in the device. The fact that the carrying strap is "reliably" fixed can mean, for example, that the carrying strap is sufficiently fixed to hold at least part of the weight of the elevator car that is transferred from the carrying strap to the device.

[0019] According to one embodiment, the holding jaw, which is increasingly tapered in the pulling direction, is wedge-shaped at least in a section of the corresponding holding jaw located forward in the pulling direction, thereby forming the tapering of the corresponding holding jaw. The section in which the holding jaws are wedge-shaped can also be referred to as a wedge-shaped section. The wedge-shaped section can, for example, extend over the entire corresponding holding jaw. In other words, the corresponding holding jaw can be wedge-shaped and form a holding wedge.

[0020] According to one embodiment, both holding jaws are progressively tapered in the pulling direction. In particular, both holding jaws can each have a correspondingly tapered wedge-shaped section, thus forming a pair of holding wedges. This can make it possible to design the two holding jaws to be congruent or at least substantially congruent, for example, except for one or more fastening elements for securing the holding jaws to one another. This can help keep manufacturing costs for the holding jaws and thus the device low.

[0021] According to one embodiment, the holding jaws are arranged mirror-symmetrically to one another. For example, the two wedge-shaped sections can jointly form a wedge, with a tip of the wedge being formed from tips of the wedge-shaped sections, and with this tip being directed in the pulling direction. The fact that the holding jaws are arranged mirror-symmetrically to one another means, in particular, that the holding jaws are arranged mirror-symmetrically to one another with respect to the carrying strap. In other words, the carrying strap can have or form an axis of symmetry to which the holding jaws are symmetrical in a side view, i.e., perpendicular to the pulling direction.

[0022] According to one embodiment, the receiving recess has a cross-section on its rear side in the pulling direction, in a direction perpendicular to the pulling direction, which is larger than a common cross-section of the two holding jaws lying in the pulling direction. This allows the holding jaws to be at least partially drawn into the receiving recess with sufficient tension. The common cross-section of the two holding jaws comprises the cross-section of one holding jaw and the cross-section of the other holding jaw. Due to the tapering of the holding jaw(s), the common cross-section of the holding jaws on the sides of the holding jaws lying in the pulling direction can be significantly smaller than the cross-section of the rear side of the receiving recess in the pulling direction.

[0023] According to one embodiment, the retaining jaw, which is increasingly tapered in the pulling direction, rests against a wall of the receiving recess upon sufficient tension on the carrying strap. This wall is a sliding surface of a ramp formed by the retaining jaw receptacle, and the corresponding retaining jaw slides along the sliding surface into the receiving recess upon tension on the carrying strap. The ramp can, for example, be designed and arranged such that the wedge-shaped section of the corresponding retaining jaw strikes the sliding surface of the ramp when the retaining jaws are pulled into the retaining jaw receptacle by means of the carrying strap.The holding jaw receptacle can, for example, be designed in two parts, wherein, when the carrying strap is arranged as intended between the holding jaws, a first part of the holding jaw receptacle is arranged on the first side of the carrying strap and a second part of the holding jaw receptacle is arranged on the second side of the carrying strap. In this case, one of the parts of the holding jaw receptacle can have or form the ramp, or both parts of the holding jaw receptacle can have or form a corresponding ramp, in particular if both holding jaws have the wedge-shaped section. If necessary, the two ramps can, for example, be designed and arranged mirror-symmetrically to one another. The fact that the ramps can be arranged mirror-symmetrically to one another means, in particular, that the ramps can be arranged mirror-symmetrically to one another with respect to the carrying strap.In other words, the carrying strap can have an axis of symmetry, to which the ramps are symmetrical in a side view, i.e., perpendicular to the pulling direction. The holding jaw receptacle can, for example, be formed by the two ramps. The two ramps can delimit the receiving recess in a direction perpendicular to the pulling direction and optionally in the pulling direction. Optionally, the ramps can be designed to be substantially congruent with the holding wedges.

[0024] According to one embodiment, the receiving recess of the holding jaw receptacle is tapered in the pulling direction such that the holding jaw receptacle forms an end stop for the holding jaws in the pulling direction, which prevents further movement of the holding jaws and thus of the clamped carrying strap in the pulling direction. The fact that the holding jaw receptacle forms an end stop for the holding jaws in the pulling direction means that the holding jaws cannot be pulled beyond the holding jaw receptacle in the pulling direction. This can be achieved in particular by the receiving recess being tapered in the pulling direction such that although the carrying strap can still pass between the parts of the holding jaw receptacle, for example between the ramps, the holding jaws themselves no longer fit between the parts of the holding jaw receptacle.

[0025] According to one embodiment, the holding jaws each have at least one anti-slip surface on their mutually facing sides, which, when the carrying strap is arranged as intended, contacts the carrying strap in order to increase friction between the corresponding holding jaw and the carrying strap. The anti-slip surfaces contribute to a particularly high friction force between the holding jaws and the carrying strap. This contributes to the reliable fixation of the carrying strap in the device. The two anti-slip surfaces can, for example, be designed and / or arranged to overlap or coincide with one another with respect to the pulling direction. For example, the anti-slip surfaces can contact the same longitudinal section of the carrying strap, but from different sides of the carrying strap. Optionally, the holding jaws can each have two or more anti-slip surfaces on their mutually facing sides.The anti-slip surfaces can each comprise or be made of plastic and / or rubber, for example.

[0026] According to one embodiment, the device comprises a holder for stationary mounting of the device in an elevator shaft of the elevator system, wherein the holding jaw receptacle is mechanically coupled to the holder and is fixedly arranged in the elevator shaft by means of the holder. Optionally, the holder can comprise a housing in which the holding jaw receptacle is fixedly arranged.

[0027] According to one embodiment, the device comprises a tensioning weight arranged on a side of the holding jaws facing away from the elevator car, relative to the path of the carrying strap, and suspended from the holding jaws in such a way that the carrying strap is pretensioned by the holding jaws against the direction of pull due to the tensioning weight. If, relative to the path of the carrying strap, a friction brake is arranged between the device and the elevator car to absorb a large portion of the weight of the elevator car transmitted by the carrying strap, the tensioning weight can contribute to ensuring the proper functioning of the friction brake, since such a friction brake only functions when the carrying means is pulled at both ends of the carrying means, as explained in more detail below.The tensile force acting on the suspension element on the side of the elevator car can be significantly greater, for example by a factor of 10 or 100, than the tensile force acting on the suspension element on the side of the device for fixing the carrying strap.

[0028] According to one embodiment, the device comprises a slip sensor designed and arranged such that slippage of the carrying strap relative to the holding jaws can be detected by the slip sensor. The slip sensor enables any slippage that may occur to be detected. The slippage can be caused, for example, by insufficient contact pressure and / or excessive tensile force of the cable. Thus, the slip sensor can help automatically detect insufficient contact pressure or excessive tensile force of the cable. This can contribute to the reliable and safe operation of the elevator system.

[0029] According to one embodiment, the scalable elevator system has a friction brake through which the carrying belt runs. The friction brake is arranged between the elevator car and the device with respect to the path of the carrying belt. The friction brake is designed to variably fix the carrying belt and thereby absorb a large portion of the weight of the elevator car transmitted by the carrying belt, so that only a small portion of the weight of the elevator car transmitted by the carrying belt needs to be held by the device. The friction brake serves to absorb a large portion of the weight of the elevator car transmitted by the carrying belt, so that only a small portion of the weight of the elevator car transmitted by the carrying belt needs to be held by the device.This makes it possible to keep the contact pressure on the carrying strap, which is generated by the holding jaws to reliably fix the carrying strap in the device, so low that the carrying strap is not damaged by the holding jaws, even if the elevator car is very heavy. Without the friction brake, the tensile force in the area of ​​the device would be significantly greater, so the contact pressure to fix the carrying strap would have to be increased accordingly. This could lead to damage to the carrying strap, especially if it is coated with a plastic layer. In particular, the plastic layer could be damaged by the high contact pressure. If the carrying strap is sufficiently stable, the contact pressure can be increased sufficiently so that the friction brake could be dispensed with.

[0030] The operating principle of a friction brake is based on using one or more fixed components to generate such a strong frictional force between the components and the carrying belt that the majority of the weight of the elevator car is transferred to the friction brake via friction. The components can, for example, comprise one or more rollers and / or cylinders, some of which can be fixed and some of which can be rotating. The fact that the carrying belt can be variably fixed in the friction brake means that the carrying belt can be fixed at different points along the carrying belt.For example, the components can be designed such that the carrying strap can be easily and variably pulled through the friction brake at low loads and correspondingly low friction, whereby a length of the carrying strap on the side of the elevator car is variable, and that the carrying strap cannot be pulled through the friction brake at high loads, in particular when moving the elevator car, due to correspondingly high friction and is fixed by the friction brake and the device, so that the elevator car can be moved reliably and safely.

[0031] The variable fixation of the carrying strap can be particularly advantageous if the scalable elevator system is designed as a climbing lift. With such a climbing lift, it is possible to suspend a machine platform of the elevator system, to which the drive machine of the elevator system is attached, at different heights within the elevator shaft and to travel to different floors of the building using the elevator car regardless of the current height. However, this requires the ability to vary the length of an active section of the carrying strap, which is possible, for example, thanks to the variable fixation of the carrying strap. The "active" section of the carrying strap is understood to be the section of the carrying strap that is subjected to the tensile force of the elevator car during normal operation of the elevator system.In particular, the active section of the carrying belt can extend from the device across the elevator car and optionally across a counterweight to a first end of the carrying belt facing away from the device, to which end the carrying belt can be attached, for example, to the machine platform. In contrast, an "inactive" section of the carrying belt lies from the elevator car along the course of the carrying belt behind the device. Due to the friction brake and the device, this inactive section is not subjected to the tensile force of the elevator car. The length of the inactive section of the carrying belt varies depending on the height level at which the climbing lift is located and the floors currently being reached with the climbing lift. The longer the active section, the shorter the inactive section, and vice versa.

[0032] Embodiments of the invention are described below with reference to the accompanying drawings, wherein neither the drawings nor the description are to be construed as limiting the invention.

[0033] Fig. 1 shows a side sectional view of a growing elevator system according to an embodiment of the present invention.

[0034] Fig. 2 shows a side sectional view of a device for fixing a carrying strap in a predetermined pulling direction, according to an embodiment of the present invention.

[0035] Fig. 3 shows a side sectional view of a device for fixing a carrying strap in a predetermined pulling direction, according to an embodiment of the present invention.

[0036] Fig. 4 shows two holding jaws and the carrying strap according to an embodiment of the present invention.

[0037] Fig. 5 shows two alternative holding jaws and two carrying straps, according to an embodiment of the present invention.

[0038] Fig. 6 is a perspective view of the device with a tension weight, according to one embodiment of the present invention. The figures are merely schematic and not to scale. Like reference numerals designate like or equivalent features in the various figures.

[0039] Fig. 1 shows a side sectional view of an evolving elevator system 10 according to one embodiment of the present invention. The evolving elevator system 10 is used to transport a load from one floor to another within a building still under construction. The evolving elevator system 10 can be designed, in particular, as a climbing lift, which can be used, for example, in a new building construction, especially if an elevator shaft 12 of the evolving elevator system 10 has not yet been completed. In this case, the evolving elevator system 10 can be used, in particular, to transport workers and construction materials to the various existing floors.

[0040] The scalable elevator system 10 comprises an elevator car 14, the at least partially completed elevator shaft 14, at least one carrying belt 20, a drive machine 18, and a device for securing the carrying belt 20 in a predetermined pulling direction 40. Furthermore, the scalable elevator system 10 can comprise a machine platform 16, a counterweight 22, several deflection pulleys 26, two buffers 30, a friction brake 32, and / or a carrying belt reservoir 38.

[0041] The elevator car 14 serves to accommodate the load. The load can be, for example, one or more people and / or goods. The elevator shaft 14 extends at least from one floor to the other. The elevator car 14 is arranged in a movable manner within the elevator shaft 14.

[0042] The carrying strap 20 is mechanically coupled to the elevator car 10. The carrying strap 20 is designed to support the elevator car 14 of the elevator system 10. A first end 24 of the carrying strap 20 can be fastened, for example, to the machine platform 16. Starting from this fastening, the carrying strap 20 runs from the first end 24 over the counterweight 22 to the elevator car 10 and further through the friction brake 32 and the device 36 to a second end 46 of the carrying strap 20, which can be stowed, for example, in the carrying strap reservoir 38. Thus, the course of the carrying strap 20 can extend from the fastening of the first end 24 over the counterweight 22, the elevator car 10, the friction brake 32, the device 36 to the carrying strap reservoir 38, in this order.In addition to the carrying belt 20, the growing elevator system 10 can have one, two or more further carrying belts 20, which run parallel to one another, for example, and between which the load to be carried by the carrying belt 20 can be distributed.

[0043] The drive machine 18 is mechanically coupled to the carrying belt 20. The drive machine 18 is designed to move the elevator car 14 within the elevator shaft 12 by means of the carrying belt 20, for example, in a vertical direction. The drive machine 18 can be arranged on the machine platform 18. The machine platform 18 can be suspended at different height levels within the elevator shaft 12. A vertical displacement of the machine platform 18 can, for example, be referred to as climbing operation of the scalable elevator system 10.

[0044] The device 36 for securing the carrying strap 20 in the predetermined pulling direction 40 has two holding jaws 50 and a holding jaw receptacle 52. The holding jaws 50 and the holding jaw receptacle 52 serve to secure the carrying strap 20 in the predetermined pulling direction 40. When the device 36 is used as intended, the carrying strap 20 is arranged as intended in the device 36. In particular, when the carrying strap 20 is arranged as intended, the carrying strap 20 is clamped between the holding jaws 50. Movement of the holding jaws 50 in the pulling direction 40 is limited by the holding jaw receptacle 52, so that the holding jaws 50 and thus the carrying strap 20 clamped by them are fixed in the pulling direction 40, in other words, are secured. In other words, the holding jaw receptacle 52 forms an end stop for the holding jaws 50 in the pulling direction 40.

[0045] Alternatively, an alternative device for fixing the carrying strap 20 in the pulling direction 40 can be used (not shown), which has one or more (holding) rollers instead of the holding jaws 50 and a gap instead of the holding jaw receptacle 52, into which the holding rollers are pulled when the carrying strap 20 slips, are clamped therein and thus fix the carrying strap 20 in the gap.

[0046] During normal operation of the elevator system 10, the carrying belt 20 is subjected to a portion of the weight of the elevator car 14 by the elevator car 12 in the pulling direction 40, so that during normal operation the elevator car 14 pulls on the carrying belt 20 in the pulling direction 40. With respect to the path of the carrying belt 20 between the device 36 and the elevator car 14, the carrying belt 20 can extend around one or more fixed rollers and / or rotatable rollers, which can at least partially absorb another portion of the weight of the elevator car 14, so that the device 36 is not subjected to the entire weight of the elevator car 14.For example, with respect to the path of the carrying belt 20, the friction brake 32 can be arranged between the device 36 and the elevator car 14, which can have the rollers that can absorb a large part of the force with which the carrying belt 20 is acted upon by the elevator car 14, and which is explained in more detail below.

[0047] The carrying belt 20 can extend through the friction brake 32. The friction brake 32 is designed to variably fix the carrying belt 20 and thereby absorb a large portion of the weight of the elevator car 14 transmitted by the carrying belt 20, such that only a small portion of the weight of the elevator car 14 transmitted by the carrying belt 20 needs to be held by the device 36. A functional principle of the friction brake 32 is based on generating such a strong frictional force between these components and the carrying belt 20 by means of one or more rotatable and / or fixed components, for example one or more brake rollers 34, that the majority of the weight of the elevator car 14 is transferred to the friction brake 32 via friction. Alternatively or in addition to the brake rollers 34, the components can, for example, comprise one or more rotatable rollers and / or fixed cylinders.The components can, for example, be designed such that the carrying strap 20 can be easily and variably pulled through the friction brake 32 under low load and correspondingly low friction, for example in an initial state before commissioning of the elevator system 1. As a result, the length of the carrying strap 20 on the side of the elevator car 14 is variable and can be adapted to the different height levels at which the machine platform 16 may be suspended. In contrast, under high load, in particular when moving the elevator car 14, the carrying strap 20 cannot be pulled through the friction brake 32 due to the correspondingly high friction and is fixed by the friction brake 32 and the device 36 such that the elevator car 14 can be moved reliably and safely.

[0048] The variable fixation of the carrying belt 20 by means of the friction brake 32 can be particularly advantageous when the scalable elevator system 10 is designed as a climbing lift. If the machine platform 16 is suspended at different heights within the elevator shaft 12 at different times and, regardless of the current height, different floors of the building are to be reached by the elevator car 14, it may be necessary to be able to vary the length of an active section 42 of the carrying belt 20, which is possible, for example, due to the variable fixation of the carrying belt 20. The "active" 42 section of the carrying belt 20 is understood to be the section of the carrying belt 20 that is subjected to the tensile force of the elevator car 14 during normal operation of the elevator system 10, i.e., when transporting the load.In particular, the active section 42 of the carrying belt 20 can extend from the device 36, optionally via the friction brake 32, via the elevator car 14 and optionally via the counterweight 22, to the first end 24 of the carrying belt 20 facing away from the device 36, wherein a part of the active section 44, which runs between the device 36 and the friction brake 32, is only subjected to a fraction of the tensile force exerted on the remainder of the active section 44 due to the friction brake 32. In contrast, an "inactive" section 44 of the carrying belt 20 lies from the elevator car 14 along the course of the carrying belt 20 behind the device 36. This inactive section 44 is not subjected to the tensile force of the elevator car 14 due to the friction brake 32 and the device 36.The length of the inactive section 44 of the carrying strap 20 varies depending on the height level at which the climbing lift, in particular the machine platform 16, is located, and depending on the floors currently being reached by the climbing lift. The inactive section 44 becomes shorter the longer the active section becomes, and vice versa.

[0049] The carrying strap reservoir 38 is arranged on the side of the device 36 facing away from the elevator car 14, relative to the path of the carrying strap 20. The carrying strap reservoir 38 is designed to accommodate at least a large portion of the inactive portion 44 of the carrying strap 20. This inactive portion 44 of the carrying strap 20 can have the second end 46 of the carrying strap 20. The carrying strap reservoir 38 can, for example, have a drum 48 that is rotatable and onto which the portion of the carrying strap 20 can be wound. The carrying strap reservoir 38 enables the inactive portion 44 of the carrying strap 20, which is not currently needed, to be safely and carefully stowed, for example by rolling the carrying strap 20 onto the drum 48. The drum 48 can, for example, be electrically and / or mechanically rotatable.The carrying strap reservoir 38 also allows the active section 42 of the carrying strap 20 to be extended if necessary, for example by unwinding the carrying strap 20 from the drum 48.

[0050] The buffers 30 under the elevator car 14 and under the counterweight 22 can serve as a lower limit for a vertical movement of the elevator car 14 and the counterweight 22, respectively. The buffers 30 can be designed, for example, as hydraulic buffers.

[0051] Fig. 2 shows a side sectional view of the device 36 for fixing the carrying strap 20 in the predetermined pulling direction 40, according to an embodiment of the present invention.

[0052] At least one of the two holding jaws 50, for example a first holding jaw 54 and a second holding jaw 56 of the holding jaws 50, are increasingly tapered in the pulling direction 40. In other words, a cross-section perpendicular to the pulling direction 40 of the two holding jaws 50 becomes increasingly smaller in the pulling direction 40. For example, the two holding jaws 50 taper to a point in the pulling direction 40, so that a pointed edge 64, in other words a sharp edge or acute angle, is formed at their respective ends directed in the pulling direction 40. The holding jaws 50, which taper increasingly in the pulling direction 40, can each be wedge-shaped at least in a section of the holding jaws 50 lying forward in the pulling direction 40, thereby forming the taper of the holding jaw 50. The sections in which the holding jaws 50 are wedge-shaped can also be referred to as wedge-shaped sections.The wedge-shaped sections can each extend, for example, over the entire holding jaws 50. In other words, the holding jaws 50 can be wedge-shaped and each form a holding wedge. In particular, the holding jaws 50 can form a pair of holding wedges. For example, the two wedge-shaped sections can jointly form a wedge, with a tip of the common wedge being formed from the pointed edges 64 of the wedge-shaped sections. The holding jaws 50 can, for example, be arranged mirror-symmetrically to one another. The fact that the holding jaws 50 are arranged mirror-symmetrically to one another means, in particular, that the holding jaws 50 are arranged mirror-symmetrically to one another with respect to the carrying strap 20. In other words, the carrying strap 20 can have or form an axis of symmetry to which the holding jaws 50 are symmetrical in a side view, i.e., perpendicular to the pulling direction 40.In the intended arrangement of the carrying strap 20, one of the holding jaws 50, for example, the first holding jaw 54, is arranged on a first side of the carrying strap 20, and the other of the holding jaws 50, for example, the second holding jaw 56, is arranged on a second side of the carrying strap 20. The two holding jaws 50 can be fastened to one another, for example, screwed or clamped together.

[0053] The holding jaw receptacle 52 is arranged in front of the holding jaws 50 in the pulling direction 40. The holding jaw receptacle 52 can, for example, be designed in two parts, wherein, when the carrying strap 20 is arranged as intended between the holding jaws 50, a first part of the holding jaw receptacle 52 is arranged on the first side of the carrying strap 20 and a second part of the holding jaw receptacle 52 is arranged on the second side of the carrying strap 20. In this case, the parts of the holding jaw receptacle 52 can each have a ramp, in particular a first ramp 58 and a second ramp 60, or can be formed therefrom. The two ramps 58, 60 can, for example, be designed and arranged mirror-symmetrically to one another. The fact that the ramps 58, 60 can be arranged mirror-symmetrically to one another means in particular that the ramps 58, 60 can be arranged mirror-symmetrically to one another with respect to the carrying strap 20.In other words, the carrying strap 20 can have the axis of symmetry, to which the ramps 58, 60 are symmetrical in a side view, i.e., perpendicular to the pulling direction 40. The holding jaw receptacle 52 can, for example, be formed by the two ramps 58, 60. Optionally, the ramps 58, 60 can be formed substantially congruent with the holding wedges, but rotated by 180° relative to them, as shown in Figure 2.

[0054] The holding jaw receptacle 52 has a receiving recess 62 for receiving the holding jaws 50. For example, the two ramps 58, 60 can delimit the receiving recess 62 in a direction perpendicular to the pulling direction 40 and optionally in the pulling direction 40. For example, the receiving recess 62 can be formed by the two ramps 58, 60. The receiving recess 62 is open towards the holding jaws 50. The receiving recess 62 is increasingly tapered in the pulling direction 40. In other words, a cross-section perpendicular to the pulling direction 40 of the receiving recess 62 becomes increasingly smaller in the pulling direction 40. The receiving recess 62 has, on its side lying at the rear in the pulling direction 40, a cross-section in the direction perpendicular to the pulling direction 40 which is larger than a common cross-section of the two holding jaws 50 lying at the front in the pulling direction 40.The common cross-section of the two holding jaws 50 comprises the cross-section of the first holding jaw 54 and the cross-section of the second holding jaw 56. The common cross-section of the holding jaws 50 on the sides of the holding jaws 50 lying at the front in the pulling direction 40, for example in the region of the pointed edges 64, can be significantly smaller than the cross-section of the side of the receiving recess 62 lying at the rear in the pulling direction 40 due to the tapering of the holding jaw(s) 50.

[0055] When the carrying strap 20 is pulled sufficiently, the holding jaws 50, which increasingly taper in the pulling direction 40, rest against a wall of the receiving recess 62, said wall having a first sliding surface 68 of the first ramp 58 and a second sliding surface 70 of the second ramp 60. When the carrying strap 20 is pulled, the holding jaws 50 slide along the corresponding sliding surface 68, 70 into the receiving recess 62. For example, the ramps 58, 60 can be designed and arranged such that the wedge-shaped sections of the holding jaws abut the corresponding sliding surfaces 68, 70 when the holding jaws 50 are pulled into the holding jaw receptacle 52 by means of the carrying strap 20.

[0056] The receiving recess 62 of the holding jaw holder 52 can be tapered in the pulling direction 40 such that the holding jaw holder 54 forms an end stop for the holding jaws 50 in the pulling direction 40, against which the holding jaws 50 rest on the carrying strap 20 when the pulling length is sufficient. The fact that the holding jaw holder 52 forms the end stop for the holding jaws 50 in the pulling direction 40 means that the holding jaws 50 cannot be pulled beyond the holding jaw holder 52 in the pulling direction 40. This can be achieved in particular by tapering the receiving recess 62 in the pulling direction 40 in such a way that the carrying strap 20 can still pass between the parts of the holding jaw holder 52, but the holding jaws 50 themselves no longer fit between the parts of the holding jaw holder.

[0057] When the carrying strap 20 is arranged as intended between the holding jaws 50, as shown in Figure 2, and with sufficient tension on the carrying strap 20 in the pulling direction 40, the holding jaws 50 can be pulled into the receiving recess 62 by means of the carrying strap 20 at least far enough that the holding jaws 50 are at least partially, for example completely, arranged in the receiving recess 62 and that the holding jaws 50 are pressed against one another due to the tapering of the receiving recess 62 and due to the tapering of the corresponding holding jaw 54, 56, so that with sufficient tension on the carrying strap 20 in the pulling direction 40, the carrying strap 20 is fixed in the holding jaw receptacle 62 by means of the holding jaws 50.

[0058] In an initial state of the device 36, in which the elevator system 10 is not in normal operation, the carrying strap 20 is not yet subjected to a tensile force in the pulling direction 40. In this initial state, the carrying strap 20 can be arranged as intended between the holding jaws 50, and the holding jaws 50 can be fastened to one another so that the carrying strap 20 is clamped between the holding jaws 50 with at least a slight contact pressure. This contact pressure should be at least large enough that the holding jaws 50 are moved along with the pulling direction 40 when the carrying strap 20 is pulled, in particular, are drawn into the receiving recess 62.

[0059] In an operating state of the device 36, for example during normal operation of the elevator system 10, the carrying belt 20 is subjected to the tensile force in the pulling direction 40, in particular due to the weight of the elevator car 14. If, in the operating state of the device 36, due to the pull caused by the tensile force, both holding jaws 50 rest against the corresponding wall of the receiving recess 62 and the pull is maintained, the two holding jaws 50 are pressed against one another due to the taper of the receiving recess 62 and the corresponding holding jaw 50, since the space in the receiving recess 62 becomes increasingly smaller due to the taper of the receiving recess 62 in the pulling direction 40. As a result, the contact pressure becomes so great that the carrying belt 20 is reliably fixed in the device 36, even if at least part of the weight of the elevator car 14 is held by the carrying belt 20 and the carrying belt 20 is pulled in the pulling direction 40.

[0060] Optionally, the holding jaws 50 each have at least one, for example two, anti-slip surfaces 66 on their mutually facing sides, which contact the carrying strap 20 when the carrying strap 20 is arranged as intended in order to increase friction between the holding jaw 50 and the carrying strap 20. The anti-slip surfaces 66 can be designed and / or arranged, for example, in pairs overlapping one another or congruently with respect to the pulling direction 40. For example, the two anti-slip surfaces 66 arranged on different holding jaws 50 can contact the same longitudinal section of the carrying strap 20, but from different sides of the carrying strap 20. Optionally, the holding jaws 50 can each have two or more of the anti-slip surfaces 66 on their mutually facing sides per carrying strap 20 (not shown).

[0061] Fig. 3 shows a side sectional view of a device 36 for securing the carrying strap 20 in the predetermined pulling direction 50, according to one embodiment of the present invention. The device 36 shown in Figure 3 can largely correspond to the device 36 explained with reference to Figure 2. Therefore, the following only discusses those features of the device 36 shown in Figure 3 with respect to which the device 36 shown in Figure 3 differs from the device 36 shown in Figure 2.

[0062] The device 36 shown in Figure 3 has only one holding jaw that tapers in the pulling direction 40, namely the first holding jaw 54. The second holding jaw 56 can, for example, be cuboid-shaped. Accordingly, the holding jaw receptacle 52 can have only one ramp, namely the first ramp 58. The second ramp 60 can be omitted in this exemplary embodiment. The functioning of the device 36 shown in Figure 3 corresponds in principle to the functioning of the device 36 shown in Figure 2, wherein, with sufficient tension on the carrying strap 20 in the pulling direction 40, the carrying strap 20 is clamped between the holding jaws 50 and thereby fixed due to the tapering of the first holding jaw 54, for example due to the wedge-shaped design of the first holding jaw 54, and due to the tapering of the receptacle recess 62, in particular due to the first ramp 58.

[0063] Fig. 4 shows the two holding jaws 50 and the carrying strap 20, according to one embodiment of the present invention. The holding jaws 50 can be the holding jaws 50 shown in Figures 1, 2, or 3. The holding jaws 50 are not yet fastened to one another, and the device 36 can be in the initial state. In Figure 4, the holding jaws 50 are "folded open," so that in Figure 4, the sides of the holding jaws 50 that face each other when the carrying strap 20 is in its intended position lie next to one another and do not face each other. The anti-slip surfaces 66 are arranged on these sides. The two holding jaws 50 can, as shown in Figure 4, be two fundamentally independent components that can be fastened to one another - TI - by means of fastening means, for example screws and nuts, when the carrying strap 20 is arranged between them.Alternatively, the two holding jaws 50 can be connected to one another by means of one or more hinges so that they can be opened up to arrange the carrying strap 20 between the holding jaws 50 and then folded back down again.

[0064] Fig. 5 shows two alternative holding jaws 50 and two carrying belts 20, according to an embodiment of the present invention. The two carrying belts 20 can, for example, run parallel to each other, and the load to be carried, in particular the weight of the elevator car 14 and / or the counterweight 22, can be distributed between the two carrying belts 20. The holding jaws 50 can be the holding jaws 50 shown in Figures 1, 2, or 3. The holding jaws 50 can largely correspond to the holding jaws 50 shown in Figure 4. Therefore, the following only discusses the features of the holding jaws 50 shown in Figure 5 with respect to which the holding jaws 50 shown in Figure 5 differ from the holding jaws 50 explained with reference to Figure 4.

[0065] The holding jaws 50 are each designed, in particular, with such a width, that the two carrying straps 20 can be arranged side by side between the holding jaws 50. The holding jaws 50 can each have one of the anti-slip surfaces 66 for each carrying strap 20, as shown in Figure 5. Thus, for example, in the case of four carrying straps 20, four of the anti-slip surfaces 66 can be arranged accordingly. Alternatively, each of the holding jaws 50 can have only one of the anti-slip surfaces 66, which are designed with such a width that they each extend over all carrying straps 20 (not shown).

[0066] Fig. 6 shows a perspective view of the device 36 with a tension weight 74, according to an embodiment of the present invention.

[0067] The device 36 can have a bracket 72 for stationary fastening of the device 36 in the elevator shaft 12. The holding jaw receptacle 52 can be mechanically coupled to the bracket 72. The holding jaw receptacle 52 can be stationary arranged in the elevator shaft 12 by means of the bracket 72. Optionally, the bracket 72 can have a housing in which the holding jaw receptacle 52 is stationary arranged.

[0068] The tensioning weight 74 is arranged on a side of the holding jaws 50 facing away from the elevator car 14, relative to the path of the carrying belt 20. The tensioning weight 74 is suspended from the holding jaws 50 in such a way that the carrying belt 20 is pretensioned by the holding jaws 50 against the pulling direction 40 due to the tensioning weight 74.

[0069] The device 36 can have a slip sensor 78, which is designed and arranged such that slippage of the carrying strap 20 relative to the holding jaws 50 can be detected by the slip sensor 78. The slip sensor 78 makes it possible to detect any slippage that may occur. If slippage is detected, one or more safety measures can be initiated. For example, an elevator control system (not shown) of the elevator system 10 can stop operation of the drive machine 18 and / or activate a parking brake (not shown) of the elevator system 10, wherein the activated parking brake prevents any displacement of the elevator car 14.

[0070] Finally, it should be noted that terms such as "having," "comprising," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be considered as limitations.

Claims

Patent claims 1. Device (36) for fixing a carrying strap (20) in a predetermined pulling direction (40), wherein the carrying strap (20) is designed to carry an elevator car (14) of a growing elevator system (10), the device (36) comprising: two holding jaws (50) for clamping the carrying strap (20), wherein the carrying strap (20) is clamped between the holding jaws (50) when the carrying strap (20) is arranged as intended, and wherein at least one of the holding jaws (50) is increasingly tapered in the pulling direction (40); and a holding jaw receptacle (52) which is arranged in front of the holding jaws (50) in the pulling direction (40) and which has a receiving recess (62) for receiving the holding jaws (50), which is open towards the holding jaws (50) and is increasingly tapered in the pulling direction (40),so that when the carrying strap (20) is arranged as intended between the holding jaws (50) and there is sufficient tension on the carrying strap (20) in the pulling direction (40), the holding jaws (50) can be pulled into the receiving recess (62) by means of the carrying strap (20) at least far enough that the holding jaws (50) are at least partially arranged in the receiving recess (62) and that the holding jaws (50) are pressed against one another due to the tapering of the receiving recess (62) and due to the tapering of the corresponding holding jaw (50, 54, 56), so that when the pulling length on the carrying strap (20) in the pulling direction (40) is sufficient, the carrying strap (20) is fixed in the holding jaw receptacle (52) by means of the holding jaws (50).

2. Device (36) according to claim 1, wherein the holding jaw (54, 56), which is increasingly tapered in the pulling direction (40), is wedge-shaped at least in a section of the corresponding holding jaw (54, 56) which is forward in the pulling direction (40), whereby the taper of the corresponding holding jaw (54, 56) is formed.

3. Device (36) according to one of claims 1 or 2, wherein both holding jaws (50) are increasingly tapered in the pulling direction (40).

4. Device (36) according to one of the preceding claims, wherein the holding jaws (50) are arranged mirror-symmetrically to one another.

5. Device (36) according to one of the preceding claims, wherein the receiving recess (62) has, on its side lying rearward in the pulling direction (40), a cross-section in the direction perpendicular to the pulling direction (40) which is larger than a common cross-section of the two holding jaws (50) lying forward in the pulling direction (40).

6. Device (36) according to one of the preceding claims, wherein the holding jaw (54, 56), which is increasingly tapered in the pulling direction (40), rests against a wall of the receiving recess (62) when the carrying strap (20) is pulled sufficiently, and this wall is a sliding surface (68, 70) of a ramp (58, 60) which is formed by the holding jaw receptacle (52), the corresponding holding jaw (54, 56) sliding along the sliding surface (68, 70) into the receiving recess (62) when the carrying strap (20) is pulled.

7. Device (36) according to one of the preceding claims, wherein the receiving recess (62) of the holding jaw receptacle (52) is tapered in the pulling direction (40) such that the holding jaw receptacle (52) forms an end stop for the holding jaws (50) in the pulling direction (40), which prevents further movement of the holding jaws (50) and thus of the clamped carrying strap (20) in the pulling direction (40).

8. Device (36) according to one of the preceding claims, wherein the holding jaws (50) each have at least one anti-slip surface (66) on their mutually facing sides, which, when the carrying strap (20) is arranged as intended, contact the carrying strap (20) in order to increase friction between the corresponding holding jaw (54, 56) and the carrying strap (20).

9. Device (36) according to one of the preceding claims, comprising: a holder (72) for stationary fastening of the device (36) in an elevator shaft (12) of the elevator system (10), wherein the holding jaw receptacle (52) is mechanically coupled to the holder (72) and is arranged in a stationary manner in the elevator shaft (12) by means of the holder (72).

10. Device (36) according to one of the preceding claims, comprising: a tensioning weight (74) which is arranged on a side of the holding jaws (50) facing away from the elevator car (14) with respect to the course of the carrying belt (20) and which is suspended from the holding jaws (50) in such a way that the carrying belt (20) is pretensioned by means of the holding jaws (50) against the pulling direction (40) due to the tensioning weight (74).

11. Device (36) according to one of the preceding claims, comprising: a slip sensor (78) which is designed and arranged such that slippage of the carrying strap (20) relative to the holding jaws (50) can be detected by means of the slip sensor (78).

12. A growing elevator system (10) for transporting a load from one floor to another within a building under construction, the elevator system (10) comprising: an elevator car (14) for receiving the load; an elevator shaft (12) which becomes higher as the building's height increases during the construction phase of the building, which extends at least from one floor to the other and in which the elevator car (14) is displaceably arranged; a carrying belt (20) which is mechanically coupled to the elevator car (14); a drive machine (18) which is mechanically coupled to the carrying belt (20) and which is designed to displace the elevator car (14) in the elevator shaft (12) by means of the carrying belt (20); a device (36) for fixing the carrying belt (20), wherein a section of the carrying belt (20) is arranged in the device (36);and a carrying strap reservoir (38) which, with respect to the course of the carrying strap (20), is arranged on a side of the device (36) facing away from the elevator car (14) and which is designed to receive a part of the carrying strap (20) which, with respect to the course of the carrying strap (20), is located on the side of the device (36) for fixing the carrying strap (20) facing away from the elevator car (14); 13. A growing elevator system (10) according to claim 12, comprising: a friction brake (32) through which the carrying belt (20) runs, which friction brake is arranged between the elevator car (14) and the device (36) with respect to a path of the carrying belt (20) and which is designed to variably fix the carrying belt (20) and in the process to absorb a large part of the weight of the elevator car (14) transmitted by means of the carrying belt (20), so that only a small part of the weight of the elevator car (14) transmitted by means of the carrying belt (20) has to be held by the device (36).

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