EP4093694A1

EP4093694A1 - Lifting device for lifting a payload within an elevator shaft in a controllable manner

Info

Publication number: EP4093694A1
Application number: EP21700780.6A
Authority: EP
Inventors: Gabriele BIZZOZERO; Stefan Weber
Original assignee: Inventio AG
Current assignee: Inventio AG
Priority date: 2020-01-20
Filing date: 2021-01-20
Publication date: 2022-11-30
Also published as: WO2021148456A1; AU2021211883B2; CA3166642A1; CN114981197A; AU2021211883A1; US20230042428A1

Abstract

The invention relates to a lifting device (17) for lifting a payload (23) within an elevator shaft (3) in a controllable manner, said lifting device having a platform (19) to be fixed in the elevator shaft (3), a holding device (33) to be fixed to the payload (23), a lifting cable (29) which is attached to the holding device (33), a securing cable (31) which is secured to the folding device (33) for example, a pulling device (25) which is secured to the platform (19), and a catching device (27) which is secured to the platform (19) for example. The pulling device (25) is designed to actively and controllably displace the lifting cable (29) relative to the platform (19). The lifting device (17) is designed to displace the securing cable (31) in the event of a relative movement between the holding device (33) and the platform (19) such that the securing cable remains tensioned. The securing cable (31) and the catching device (27) are designed such that the catching device (27) blocks a further relative movement between the securing cable (31) and the catching device (27) in the event the lifting cable (25) fails.

Description

Lifting device for controllable lifting of a payload within a

Elevator shaft

The present invention relates to a lifting device for controllably lifting a payload within an elevator shaft and to an elevator installation equipped therewith.

Elevator systems are known which can already be operated while a building that is to be supplied by the elevator system is still under construction. Such elevator systems are sometimes also referred to as climb lifts. In this case, a lower part of an elevator shaft can already be completed and an elevator car can be relocated in this lower elevator shaft part, while an upper part of the elevator shaft is not yet completed. The elevator car can thus already be used in a construction phase of the building, for example in order to transport construction workers and / or construction material between lower floors of the building. One possible embodiment is described by way of example in EP 2636 629 A1.

It is also known that, during the construction phase, objects also have to be transported in the upper part of the building. For example, it may be desirable to move construction material within the partially completed upper part of the elevator shaft. For this purpose, a lifting device can be installed within the upper part of the elevator shaft, which has a pulling device, for example in the form of a cable winch, with the aid of which a payload can be raised and lowered within the elevator shaft.

In this case, however, it must be ensured that any objects falling from the lifting device do not endanger the elevator car located further down or even the passengers located therein.

WO 2015/003964 A1 therefore describes a fall protection device for a platform which is intended to protect the elevator car from falling objects.

However, such platforms usually only protect against smaller falling objects such as screws, tools or the like. However, it may also be desirable during the construction phase to lift heavy objects with weights of, for example, over 20 kg within the elevator shaft. For example, it may be necessary to lift a guide rail element in the elevator shaft in order to be able to extend a guide rail of the elevator system upwards so that the elevator system can “grow” with the building. In KR 10-2019-0012506, a holding device is described by way of example, with the aid of which a guide rail element can be connected to a lifting rope in order to be able to pull the guide rail element up with the lifting rope with the aid of a pulling device within the elevator shaft.

If such a heavy object should inadvertently come loose and fall in the direction of the elevator car located below, it would with a high degree of probability break through any platforms or a car roof and thus represent a high risk for passengers.

Therefore, conventionally, such heavy objects are typically lifted with the help of two independent pulling devices, i.e. for example two separate cable winches, so that if one of the pulling devices fails, the object is at least held by the other pulling device and prevented from falling.

However, the provision of two pulling devices generally represents an additional outlay in terms of equipment and thus leads to additional costs. In addition, the two pulling devices should be operated synchronized with each other, which requires further effort.

Among other things, there may be a need for a lifting device for controllably lifting a payload within an elevator shaft, which is constructed simply and / or inexpensively and / or can be operated simply and reliably. Furthermore, there may be a need for a correspondingly equipped elevator system.

Such a need can be met by the lifting device and the elevator installation according to the independent claims. Advantageous embodiments are defined in the dependent claims and the description below. According to a first aspect of the invention, a lifting device for controllably lifting a payload within an elevator shaft is described, which has a platform to be fixed in the elevator shaft, a holding device to be fixed to the payload, a lifting rope attached to the holding device, a pulling device attached to the platform, has a safety rope and a catching device which cooperate at a first coupling point with the holding device and at a second coupling point with the platform. The pulling device is set up to actively and controllably displace the lifting rope relative to the platform. The lifting device is set up in such a way that the safety rope is displaced relative to the catching device during a relative movement between the holding device and the platform in such a way that it remains tensioned between the first and the second coupling point. The safety rope and the safety device are set up in such a way that the safety device blocks any further relative movement between the safety rope and the safety device in the event of a failure of the lifting rope.

According to a second aspect of the invention, an elevator installation is described which has an elevator car to be relocated within a lower area in an elevator shaft and a lifting device arranged above the lower area according to an embodiment of the first aspect of the invention.

Possible features and advantages of embodiments of the invention can be viewed, inter alia and without restricting the invention, as being based on the ideas and knowledge described below.

Briefly summarized, in the case of the lifting device described herein, a payload to be lifted can be fixed to a holding device, which in turn is both held by the lifting rope and secured by the safety rope. The lifting rope can be actively shifted with the help of the pulling device fixed on the platform in order to raise the payload within the elevator shaft. In contrast to this, the safety rope does not serve to actively displace the payload, but only to protect the payload actively displaced with the hoisting rope from falling, for example in the event of a failure of the hoisting rope, in particular if the hoisting rope breaks. In other words, the safety rope does not have its own pulling device relocated, which would be able to actively lift the payload on its own via the lifting rope. Instead, the safety rope is only kept under tension, that is to say, for example, displaced in such a way that it does not sag. The safety rope interacts with the safety gear. This safety gear is designed, for example, to prevent the safety rope from moving excessively quickly relative to the safety gear. The fall arrest device can thus prevent the safety rope from accelerating sharply and beyond the speed limit value, for example in the event of a failure of the lifting rope, together with the falling payload. By blocking the relative movement of the safety rope in relation to the safety gear, the payload can thus be prevented from falling.

Properties of the lifting device proposed herein and of its components as well as their embodiments are described in more detail below.

The lifting device is intended to move, in particular to lift, heavy payloads, in particular in an upper part of a possibly only partially completed elevator shaft. A payload can have a weight of, for example, more than 20 kg, preferably more than 50 kg or even more than 100 kg. In particular, heavy rail elements can be lifted as payload, which typically have a weight of well over 100 kg.

For this purpose, the lifting device has a platform that can be fixed within the elevator shaft. A fixation of the platform can be designed in such a way that the fixation can be reversibly released in order to be able to relocate the platform, for example, to a higher part of the elevator shaft and fix it there again as soon as the elevator shaft has been structurally extended upwards. The platform can be temporarily anchored in the elevator shaft with screws, for example. A force-fit spreading of the platform in the elevator shaft is also conceivable in order to temporarily fix the platform in a stationary manner in the elevator shaft. On the other hand, the fixation should be designed in such a way that the platform remains securely anchored in the elevator shaft even when it is loaded with the weight of the payload. The platform can be designed, for example, with resilient structural elements such as supports, retaining profiles and the like. In particular, the platform can have load-bearing steel beams. In order to be able to lift the payload, the lifting device has a holding device which can be fixed to the payload at least temporarily. The holding device should be structurally designed in such a way that it can withstand the weight forces of the payload to be lifted. In particular, the holding device can be designed to be able to be coupled to the payload in a simple and rapid manner. For this purpose, the holding device can have a structure or geometry with which it can be simply but reversibly connected to the payload. For example, the holding device can have a shape that is complementary to the payload in order to be able to be coupled to the payload in a form-fitting manner. Furthermore, the holding device can be designed so that both the lifting rope and the safety rope can be attached to it in a simple and reliable manner.

The purpose of the lifting rope is to be able to lift the holding device together with the payload attached to it. For this purpose, the lifting rope should have sufficient mechanical strength or resilience in order to be able to withstand at least the weight of these two components, but preferably also forces that go beyond this, as can occur when the two components are accelerated. In particular, the lifting rope should be able to withstand forces of, for example, more than 1 kN, preferably more than 5 kN or even more than 10 kN. The lifting rope can have transverse dimensions, i.e. a diameter of a few millimeters for a round rope, for example between 2 mm and 20 mm, preferably between 5 mm and 10 mm.

The term “rope” is to be interpreted broadly here and is understood to be representative of elongated components that can be subjected to tensile loads and can be moved transversely to the direction of pull. Thus, a “rope” can also be designed in the manner of a belt or belt. The lifting rope can be composed of a large number of metallic strands as a steel rope or generally a metal rope. Alternatively, the lifting rope can also be a heavy-duty textile rope composed of fibers.

The pulling device serves to actively and controllably displace the lifting rope together with the holding device fixed on it and the payload fixed on it. For this purpose, the pulling device should exert sufficiently high forces on the lifting rope can exercise in order to be able to move this up and down again with the brakes within the elevator shaft together with the payload held on it. In other words, the pulling device should not only be able to hold the weight of the payload including the weight of the holding device, but should also be able to shift these components upwards against their weight. Here, the pulling device can preferably bring about lifting speeds of more than 0.1 m / s, preferably more than 0.3 m / s or even more than 1 m / s. The pulling device has an active drive for this purpose. The active drive can exert the desired force on the lifting rope. The drive can, for example, have an electric motor. The drive can possibly also have a gearbox to translate the driving force. The drive can be activated and deactivated in a controlled manner and, if necessary, its drive speed can be changed. For this purpose, the pulling device can have a control. The drive can, for example, drive a roller onto which the lifting rope can be wound. Accordingly, the drive can be designed as a type of cable winch, in particular a drum winch. Alternatively, the drive can drive a roller or a traction sheave, over or along the surface of which the lifting rope runs and, due to the resulting friction, a desired traction is brought about between the outer surface and the lifting rope. In particular, the pulling device can be designed as a cable winch.

Such a rope passage is sometimes referred to as a tirak.

The safety rope can be designed similarly or identically to the lifting rope. In particular, the safety rope should also have at least a load-bearing capacity that is sufficient to hold a total weight of the payload and the holding device. For example, the safety rope should have at least a load capacity of 2 kN, preferably at least 5 kN or at least 10 kN. Preferably, the load-bearing capacity of the safety rope should even be high enough to be able to withstand dynamic forces such as can occur if, for example, the lifting rope fails and the payload briefly falls or swings, only to be intercepted with the safety rope.

The holding device can comprise a shackle, and the safety rope can be attached to the same shackle to which the lifting rope is attached. The safety rope runs at least with partial areas between the first coupling point and the second coupling point. At the first coupling point, the safety rope is attached to the holding device or at least held on it, so that forces can be transmitted from the safety rope to the holding device. At the second coupling point, the safety rope is attached to the platform or at least held on it so that forces can be transmitted from the safety rope to the platform. Further components can be arranged between the safety rope and the holding device or the platform, via which forces can be transmitted between the safety rope and the holding device or the platform. In particular, the safety rope can interact with the safety device and transmit forces to it, and the safety device in turn can be attached to the platform, with the safety rope being attached to the holding device, for example, with an opposite end. Alternatively, the safety device can be attached to the holding device so that the safety rope can transmit forces to the holding device by interacting with the safety device, the safety rope being attached to the platform, for example, with an opposite end.

The safety gear is designed to quickly block a relative movement between the safety rope and the safety gear if the lifting rope should fail and the payload is thus only attached to the safety rope. By specifically blocking the safety rope, movement of the safety rope and the payload attached to it relative to the safety gear attached to the platform attached in the elevator shaft can be prevented, thus preventing the payload from falling.

For example, the safety rope and the safety device can be set up in such a way that the safety device blocks a further relative movement between the safety rope and the safety device in the event that a relative speed between the safety rope and the safety device exceeds a predetermined speed limit value. The safety gear interacts with the safety rope in such a way that the safety rope can be moved relative to the safety rope at a relatively low speed. However, if the relative speed increases excessively, a Activated mechanism by means of which the further relative movement between the safety rope and the safety gear is blocked, ie at least strongly braked or preferably braked to a standstill.

For example, the catching device can be designed to be small, light and compact and attached to the platform of the lifting device. The safety rope can run through the safety gear. If the speed exceeds a specified value when the safety rope is moved, the safety gear closes automatically and catches a load safely. The safety rope can be held between clamping jaws, for example, which prevent it from slipping further. A surface of the clamping jaws can be large enough so that the safety rope is not damaged. A construction of the fall arrest device can ensure that the clamping jaws hold the stronger the more load pulls on the safety rope. Typically, the air-termination system is tested with a multiple of its nominal load, for a multiple of safety. This security can be confirmed, for example, with certification in accordance with a European standard EN 1808 by an independent certification body.

According to a specific embodiment, the catching device can be designed in such a way that the speed limit value of the catching device is greater than a maximum speed to be controlled at which the pulling device can displace the hoisting rope.

In other words, the safety gear can be structurally or functionally configured in such a way that it blocks the relative movement between the safety rope and the safety gear as soon as the safety rope moves faster than the pulling device can move the lifting rope. If the safety rope moves faster than a maximum displacement of the lifting rope that can be effected by the pulling device, this indicates that the lifting rope has broken and the holding device, which is now only held by the safety rope, together with the payload, accelerates the safety rope to an overspeed. In this case, the fall arrest device can brake the incipient free fall of the payload by blocking the displacement movement of the safety rope and ultimately stop it. In an alternative embodiment, the safety gear cannot activate its brake shoes caused by excessive speed, but rather by scanning the lifting rope. The catching device can be kept open, for example, by means of a lever which is supported on the lifting rope, for example with a roller. If the lifting rope breaks, the support is missing and the safety gear closes its brake shoes and thus blocks further relative movement between the lifting rope and the safety gear.

In both above-described embodiments, such a catching means may be partially also referred to as Stop Block ^®.

In order to avoid the holding device and the attached payload initially starting to fall freely in the event of failure of the lifting rope until the safety rope intercepts the free fall, the lifting device is designed in such a way that the safety rope always remains taut when the holding device is due to a moved by the pulling device caused pull on the hoisting rope relative to the platform. In other words, due to a suitable design of components of the lifting device, the safety rope never sags slack even when the holding device attached at one end moves relative to the platform of the lifting device holding the catching device, but always at least slightly tensioned is. In the event that the lifting rope suddenly fails, the safety rope does not need to be tensioned first or the payload does not first fall a little until the safety rope is tensioned. Accordingly, excessive dynamic forces in particular can be avoided when intercepting such a free fall.

Such a continuous tensioning of the safety rope can be technically realized in different ways.

For example, according to one embodiment, the lifting device can furthermore have a deflection device fastened to the platform. The safety rope can run from a first end attached to the holding device upwards to the deflection device and from this again downwards to a second end. A counterweight can then be attached to the second end of the safety rope be attached.

In other words, a deflection device can be provided on the platform of the lifting device, over which the safety rope can run and is deflected in the process. The deflection device can be, for example, a deflection roller or a deflection pulley. The safety rope can run along a lateral surface of the deflection device. The deflection device can be rotatably mounted about an axis.

The safety rope is attached at its first end to the holding device and is therefore at least partially loaded with the weight of the holding device and the payload attached to it. A counterweight is provided on the safety rope at the opposite second end. The counterweight ensures that the safety rope is always under sufficient tension to avoid sagging and thus keep it taut. In other words, due to the forces acting in parallel directions on the safety rope at the two opposite ends, the safety rope loads with a corresponding force on the deflection device and is accordingly always subjected to tension and thus kept taut.

The force caused by the counterweight should, however, be significantly less than the force to be applied to the holding device by the pulling device via the lifting rope. For example, the counterweight should weigh significantly less than 50%, preferably less than 20%, of the payload to be lifted.

A continuous tensioning of the safety rope with the aid of the described arrangement of deflection device and counterweight can be implemented in a technically simple, cost-effective and reliable manner.

According to a further specific embodiment, a weight of the holding device can be greater than a sum of a weight of the counterweight and a weight of the safety rope. In other words, the weight of the counterweight should be such that, on the one hand, it can reliably keep the safety rope under tension. On the other hand, the weight of the counterweight should not be greater than the weight of the holding device minus the weight of the safety rope, as it could otherwise be difficult or even impossible to remove the holding device after the payload has been lifted with its help and then separated from the holding device was to lower back down. The weight of the holding device should preferably be at least 10% greater than the sum of the weight of the counterweight and the weight of the safety rope.

According to an alternative embodiment, the safety rope can be stretched taut between the second coupling point on the platform and a position arranged below the safety device, wherein the safety device can be attached to the holding device and can interact there as the first coupling point with the safety rope.

In other words, the safety rope can be attached with an upper end to the platform and hang down from there. A lower end can, for example, be weighted down with a weight or attached to a further component of the elevator system arranged below the platform, so that the safety rope is kept under tension as a whole. The safety rope can interact with the safety gear between the upper end and the lower end. The catching device can be attached to the holding device. The fall arrester can be raised together with the payload by lifting the lifting rope and moving vertically upwards along the safety rope. In the event that the lifting rope fails, in particular breaks, the payload is then held on the safety rope together with the holding device and the spontaneously blocking catching device and thus prevented from falling. In such an embodiment, the safety rope can be installed relatively easily in the lifting device or the elevator system.

According to yet another alternative embodiment, the safety rope can be attached to the platform with a first and an opposite second end. The lifting device can then also be one attached to the platform Have deflection device over which the safety rope runs. The catching device can then be fastened to the holding device and interact there as a first coupling point with a first region of the safety cable running between the first end and the deflecting device. The safety rope can be weighted and kept under tension by a counterweight acting in a second area between the deflection device and the second end.

In other words, the safety rope can be held on the platform in a manner similar to a 2: 1 suspension. Between the first end fastened to the platform and the area running over the deflection device, the safety cable runs downwards to the catching device. Between the area running over the deflection device and the second end, the safety rope runs towards a counterweight attached to the safety rope. The counterweight always keeps the safety rope under tension. Similar to the embodiment described above, the catching device can move together with the payload and the holding device raised by the lifting rope. Should the lifting rope break, the safety rope can prevent the payload from falling. The safety rope can prevent falling in many cases even if the safety rope breaks in a partial area, in particular if the safety device is designed to block in both directions of movement of the safety rope relative to the safety device in the event of overspeed.

Furthermore, according to one embodiment, the safety device can be set up to block the further relative movement between the safety rope and the safety device exclusively when the relative speed between the safety rope and the safety device exceeds the specified speed limit value in a direction of movement in which the holding device attached to the safety rope shifts downwards.

In other words, the safety gear can be configured to block the relative movement between the safety rope and the safety gear only when the safety rope moves in a direction in which the holding device attached to it moves downwards and the predetermined speed limit is exceeded. In the opposite direction, i.e., when the holding device moves upwards, the catching device generally does not need to be able to block. As a result, a structural design of the interception device can be simplified.

In one embodiment of the elevator system according to the second aspect of the invention, the elevator system can be operable by means of the lifting device before the elevator shaft is completed for moving the elevator car and for lifting payloads above the elevator car.

In other words, the proposed elevator system can be a climb lift that can already be used before the elevator shaft or the building accommodating the elevator shaft is completed. On the one hand, the elevator car can be relocated within a lower area of the elevator shaft in order to be able to convey people and / or material there. On the other hand, the lifting device described herein can be used in order to be able to transport payloads in a region of the elevator shaft above the lower region, i.e. above the travel range of the elevator car.

Due to the implementation proposed here, in which the payload is not only held and shifted with the lifting rope but also secured with the safety rope, there is no significant risk of the payload falling in an uncontrolled manner and the elevator car located below it people are endangered.

It is pointed out that some of the possible features and advantages of the invention are described herein with reference to different embodiments of the lifting device on the one hand and the elevator installation equipped therewith on the other hand. A person skilled in the art recognizes that the features can be combined, adapted or exchanged in a suitable manner in order to arrive at further embodiments of the invention.

Embodiments of the invention are described below with reference to the accompanying drawings, wherein neither the drawings nor the description are to be interpreted as restricting the invention. 1 shows an elevator installation with a lifting device according to an embodiment of the present invention.

2 shows an enlarged view of a holding device for a lifting device according to an embodiment of the present invention.

3 shows an elevator installation with a lifting device according to an alternative embodiment of the present invention.

4 shows an elevator installation with a lifting device according to a further alternative embodiment of the present invention.

The figures are only schematic and not true to scale. In the various figures, the same reference symbols denote the same or equivalent features

1 shows an elevator installation 1 according to an embodiment of the invention. The elevator system 1 is designed as a climb lift. In a building that is still under construction, an elevator shaft 3 has not yet been completely completed.

In a lower area 5 of the elevator shaft 3, the elevator installation 1 is already being operated in order to transport passengers such as construction workers or objects such as construction material between lower floors of the building. For this purpose, the elevator installation 1 has an elevator cabin 7, which can be displaced within the lower area 5 of the elevator shaft 3 with the aid of a drive machine 9. For this purpose, the drive machine 9 is held on a platform 11 temporarily fixed in the elevator shaft 3. In this case, the drive machine 9 can move rope-like suspension means 13, on which the elevator car 7 is suspended, upwards and downwards.

In an upper area 15 of the elevator shaft 3, ie above the platform 11 delimiting the lower area 5 towards the top, the elevator installation 1 has a lifting device 17 according to the invention upper Area 15 of the elevator shaft 3 are conveyed. The lifting device 17 is designed to also lift heavy objects such as guide rail segments 35 with a weight of over 100 kg within the upper area 15 of the elevator shaft 3. Precautions are taken to reliably prevent such heavy objects from falling and thus endangering the elevator car 7 located below.

For this purpose, the lifting device 17 has a further platform 19. This further platform 19 is arranged near an upper end of the at least partially completed elevator shaft 3 and is fixed in the elevator shaft 3. For this purpose, the platform 19 can be anchored temporarily and reversibly releasably in the walls of the elevator shaft 3 with the aid of fixing means 21 such as screws, bolts or the like. Alternatively, the platform 19 can be expanded within the elevator shaft 3 with the aid of suitable fixing means 21.

The lifting device 17 also has a pulling device 25 fastened to the platform 19, a catching device 27 also fastened to the platform 19, a lifting rope 29, a safety rope 31 and a holding device 33.

The holding device 33 is here, as enlarged in FIG. 2 and shown as an example in a perspective view, designed to hold the payload 23, for example in the form of a guide rail segment 35, or to be attached to it at least temporarily and detachably. For this purpose, the holding device 33 can be formed with an angled metal sheet 37 in which a recess 39 is formed. A shape of the recess 39 can be essentially complementary to a cross-sectional shape of the guide rail segment 35 acting as a payload 23. In the example shown, the metal sheet 37 can be pushed with its recess 39 over the guide rail segment 35 and then a stop plate 41 can be temporarily attached to the guide rail segment 35 with screws 43 above the metal sheet 37. The screws 43 can be screwed into drilled holes in the guide rail segment 35, which are provided for later fastening of the guide rail segment 35 to walls of the elevator shaft 3. In this way, the guide rail segment 35 can be fixed as a payload 23 on the holding device 33. Furthermore, the holding device 33 shown has via another hole in which a shackle 45 is held. With the aid of the shackle 45, one end of the lifting rope 29 can be fastened to the holding device 33, for example with the aid of a carabiner 47.

Starting from the holding device 33, the lifting rope 29 then runs to the pulling device 25 attached to the platform 19. The pulling device 25 is configured to actively and controllably displace the lifting cable 29 relative to the platform 19. For this purpose, the pulling device 25 can be designed as a cable winch, in particular as a pass-through cable winch or Tirak. An operation of the pulling device 25 can be controlled with the aid of a controller (not shown). The lifting rope 29 can be composed of several steel strands as a steel rope and, for example, have a diameter of 8 mm.

The safety rope 31 provided in addition to the lifting rope 29 in the lifting device 17 is provided to secure the payload 23, i.e. to prevent the payload from falling in the event that the lifting rope 25 fails.

For this purpose, the safety rope 31 is also attached to the holding device 33 with a first end. For example, the safety rope 31 can be attached to the same shackle 45 to which the lifting rope 29 is attached. Alternatively, a further shackle or the like (not shown) can be fastened or arranged on the holding device 33 for this purpose. Starting from the holding device 33, the safety rope 31 then runs upwards to a deflection roller 51 serving as a deflection device 49. The deflection device 49 is held on the platform 19 and can rotate about an axis of rotation. The safety rope 31 runs over a lateral surface of the deflection device 49 and then down to a counterweight 53 which is attached to a second end of the safety rope 31. Between the deflection device 49 and the counterweight 53, the safety rope 31 still runs through the catching device 27.

Due to the counterweight 53 and the deflection of the safety rope 31 on the deflection roller 51, the safety rope 31 is thus always kept under tension. In other words, the counterweight 53 has the effect that the safety rope 31 never sags slack even in the event that its opposite end together with the holding device 33 attached to it is lifted with the aid of the lifting rope 29. In particular, a region of the lifting rope 29 running between the holding device 33 and the catching device 27 always remains taut.

The safety device 27 is configured for this purpose and interacts with the safety rope 31 in such a way that, in the event of failure of the lifting rope 29, it does not block any relative movement between the safety rope 31 and the safety device 27.

For this purpose, the catching device 27 can be designed as a so-called block stop 55. The safety rope 31 runs through such a block stop 55. The Blocstop 55 can be structurally designed to directly detect a failure of the lifting rope 29 and then to block the movement of the safety rope 31. Alternatively, the block stop 55 can be designed to detect the failure of the lifting rope 29 indirectly via the fact that the safety rope 31 runs through the block stop 55 at a relative speed exceeding a speed limit value, and then to block the movement of the safety rope 31. The speed limit value can for example be selected in such a way that it is greater than a speed at which the pulling device 25 can displace the lifting rope 29 upward as quickly as possible.

In Fig. 3, an elevator installation 1 with an alternative lifting device 17 is shown. In this embodiment, one end of the safety rope 31 is fixed to the platform 19. An opposite end of the safety rope 31 is loaded with a counterweight 53, so that the safety rope 31 is always kept under tension. Alternatively, the safety rope 31 can be attached with its lower end to another elevator component such as the lower platform 11 and put under tension. The safety rope 31 runs through a catching device 27 in the form of a block stop 55, which is fastened to the holding device 33. When the holding device 33 together with the payload 35 is slowly raised by the pulling device 25, the catching device 27 can move along the tensioned safety rope 31. In the event that the lifting rope 29 should break, the catching device 27 blocks so that the payload 23 is held on the safety rope 31 via the holding device 33 and the catching device 27 and is prevented from falling. The lifting device 17 with a safety rope 31 running in this way can be installed particularly easily. 4 shows an elevator installation 1 with a further alternative embodiment of a lifting device 17. The safety rope 31 is attached to the platform 19 with both of its ends. Furthermore, a deflection device 49 in the form of a deflection roller 51 is arranged on the platform 19. A first area of the safety rope 31 runs between the first end of the safety rope 31 and the deflection roller 51 through the catching device 27 attached to the holding device 33 in the form of a block stop 55. A second area of the safety rope 31 runs between the deflection roller 51 and the second end of the safety rope 31 and is kept under tension by a counterweight 53 attached to it. In such a configuration, the safety rope 31 can in many cases even prevent the payload 35 from falling if not only the lifting rope 29 but also the safety rope 31 itself should break in one of its sub-areas.

With embodiments of the described lifting device 17, payloads 23, in particular heavy guide rail segments 35, can be transported in the upper area 15 of the elevator shaft 3 already during the construction phase of a building and in particular while the elevator car 7 is already being used as a means of transport in the lower area 5 of the elevator shaft 3 . While the payload 23 is being lifted with the aid of the pulling device 25 and the lifting rope 29, the payload 23 is always secured against falling with the aid of the safety rope 31, for example in the event of an unexpected failure of the lifting rope 29. The safety rope 31 is kept under tension with the aid of the counterweight 53 and blocked in its movement by the catching device 27 in the event of the failure of the lifting rope 29 and thus fixed relative to the platform 19.

After the payload 23 has been raised within the elevator shaft 3 to a target height, the holding device 33 can be released from the payload 23. A weight of the counterweight 53 together with a weight of the safety rope 31 should be smaller than the weight of the holding device 33, especially in the embodiment shown in FIG. 1, so that the holding device 33 is back in the elevator shaft even after the payload 23 has been released due to its own weight 3 can be lowered in order to be able to attach a payload 23 to it again. For example, with a counterweight with a weight of 8 kg and a safety rope of 40 m length with a length weight of 0.5 kg / m, ie one Weight of the safety rope of 20 kg, a weight of the holding device 33 at least 30 kg.

Finally, it should be pointed out that terms such as “having”, “comprising”, etc. do not exclude any other elements or steps and that terms such as “a” or “an” do not exclude a plurality. Furthermore, it should be pointed out that features or steps that have been described with reference to one of the exemplary embodiments above can also be used in combination with other features or steps of other exemplary embodiments described above. Reference signs in the claims are not to be regarded as a restriction.

Claims

1. Lifting device (17) for controllably lifting a payload (23) within an elevator shaft (3), comprising: a platform (19) to be fixed in the elevator shaft (3), a holding device (33) to be fixed to the payload (23) , a lifting rope (29) attached to the holding device (33), a pulling device (25) fastened to the platform (19), a co-operating at a first coupling point with the holding device (33) and at a second coupling point with the platform (19) Safety rope (31), and a catching device (27), wherein the pulling device (25) is set up to actively and controllably displace the lifting rope (29) relative to the platform (19), the lifting device (17) being set up in such a way that during a relative movement between the holding device (33) and the platform (19) the safety rope (31) is displaced relative to the catching device in such a way that it remains tensioned between the first and the second coupling point, and thereby k indicates that the safety rope (31) and the safety device (27) are set up in such a way that the safety device (27) blocks any further relative movement between the safety rope (31) and the safety device (27) in the event of failure of the lifting rope (25).

2. Lifting device according to claim 1, wherein the holding device (33) comprises a shackle (45), and the safety rope (31) is attached to the same shackle (45) to which the lifting rope (29) is attached.

3. Lifting device according to one of claims 1 or 2, wherein the safety device (27) is attached to the platform (19) and the safety rope (31) is attached to the holding device (33).

4. Lifting device according to one of claims 1 or 2, wherein the safety device (27) is attached to the holding device (33) and the safety rope (31) is attached to the platform (19).

5. Lifting device according to one of the preceding claims, wherein the safety rope (31) and the safety device (27) are set up such that the safety device (27) in the event that a relative speed between the safety rope (31) and the safety device (27) a exceeds the predetermined speed limit value, a further relative movement between the safety rope (31) and the safety gear (27) is blocked.

6. Lifting device according to claim 5, wherein the speed limit value of the catching device (27) is greater than a maximum speed to be controlled with which the pulling device (25) can move the lifting rope (29).

7. Lifting device according to one of the preceding claims, wherein the lifting device (17) further comprises a deflection device (49) attached to the platform (19), the safety rope (31) coming from a first end attached to the holding device (33) runs up to the deflection device (49) and from this again downwards to a second end, and a counterweight (53) is attached to the second end.

8. Lifting device according to claim 7, wherein a weight of the holding device (33) is greater than a sum of a weight of the counterweight (53) and a weight of the safety rope (31).

9. Lifting device according to one of claims 1 to 6, wherein the safety rope (31) is taut between the second coupling point on the platform (19) and a position below the catching device (27) and wherein the catching device (27) on the holding device (33) is attached and interacts there as the first coupling point with the safety rope (31).

10. Lifting device according to one of claims 1 to 6, wherein the safety rope (31) is attached to the platform (19) with a first and an opposite second end, the lifting device (17) further attached one to the platform (19) Has deflecting device (49) over which the safety rope (31) runs, the catching device (27) being attached to the holding device (33) and there as a first coupling point with a first region of the running between the first end and the deflecting device (49) Safety rope (31) cooperates, and wherein the safety rope is weighted and kept under tension by a counterweight (53) acting in a second area between the deflection device (49) and the second end.

11. Lifting device according to one of the preceding claims, wherein the catching device (27) is set up to block the further relative movement between the safety rope (31) and the catching device (27) only when the relative speed between the safety rope (31) and the The safety gear (27) exceeds the predetermined speed limit value in a direction of movement in which the holding device (33) attached to the safety rope (31) is displaced downwards.

12. Lifting device according to one of the preceding claims, wherein the safety rope (31) has a load capacity which is sufficient to hold a total weight of the payload (23) and the holding device (33).

13. Elevator installation (1), comprising: an elevator car (7) to be relocated within a lower region (5) in an elevator shaft (3), and a lifting device (17) according to one of claims 1 to above the lower region (5) 11.

14. Elevator system according to claim 13, wherein the elevator system (1) can be operated by means of the lifting device (17) for moving the elevator car (7) and for lifting payloads (23) above the elevator car (7) before the elevator shaft (3) is completed .