Elevator system
Patent Information
- Application Number
- EP2023704711
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-02-09
- Filing Date
- 2023-02-06
- Publication Date
- 2024-12-18
Smart Images
Figure 1.1
Abstract
Description
[0001] Elevator system
[0002] The invention relates to an elevator system according to the preamble of claim 1.
[0003] Elevator systems contain elevator cars that are moved up and down in an elevator shaft by means of suspension elements, such as suspension ropes or belts, using a drive unit. For certain situations, such as maintenance work or inspections, it is necessary for people to be on the car roof. If the gap between the car and the adjacent shaft wall is too wide, balustrades must be installed on the car roof to provide fall protection.
[0004] Balustrades on the roof of elevator cars have been known and used for a long time. The balustrades consist of vertical posts and horizontal beams connecting the posts. The beams may have at least one handrail forming the top beam. For example, the US standard ASME A17.1-2000 and the European standard EN81-20:2014 contain instructions with detailed specifications for the design and dimensioning of the car roof and the necessary balustrade. To ensure sufficient stability, the common balustrades are comparatively heavy and expensive.
[0005] It is therefore an object of the present invention to avoid the disadvantages of the known art and, in particular, to create an improved elevator system. The elevator system comprises an elevator car with a balustrade arranged on its roof, which balustrade is intended to protect people from falling into the car shaft in a simple and safe manner.
[0006] These objects are achieved according to the invention with the elevator system having the features of claim 1. The elevator system comprises an elevator car that can be guided or guided vertically along at least one guide rail. The elevator system can further comprise an elevator shaft. The elevator car can be moved up and down along the guide rails, which are preferably arranged in the elevator shaft. The elevator car has a roof with a balustrade arranged thereon as a fall protection device to delimit an accessible, interior area on the roof. For maintenance work, for example, a person can remain safely in the interior area on the roof. To the outside, there is access to the adjacent shaft wall, to which a guide rail can be attached.However, it is also conceivable that the guide rail is positioned on the adjacent shaft wall mentioned above, but there is no direct connection between the guide rail and the shaft wall in question. The guide rail can, for example, be connected to the elevator shaft via a support structure that is fixed to the elevator shaft on the shaft door side.
[0007] The balustrade comprises guide rail engagement means, via which the balustrade can be supported inwards on one of the guide rails. In other words, the balustrade can be engaged with at least one of the guide rails in the secured position via or with the aid of the guide rail engagement means, such that the balustrade is supported inwards or towards the inner area in the secured position. The fact that the balustrade comprises guide rail engagement means, via which the balustrade can be supported inwards on one of the guide rails, offers several advantages. Thanks to the inward support, it is ensured that undesired yielding can be easily prevented when horizontal forces act from the outside to the inside, for example when a person pulls on the balustrade. The balustrade can therefore be constructed from comparatively light and thin structures.
[0008] The elevator system can further comprise at least one counterweight that can be moved up and down in the opposite direction to the elevator car. This at least one counterweight is also preferably guided on guide rails (counterweight guide rails). For certain elevator configurations, it is also conceivable for the balustrade to comprise guide rail engagement means, via which the balustrade can be supported inwardly on the counterweight guide rail(s). It is also conceivable for the respective guide rail, on which the balustrade is supported inwardly in the secured position, to be provided for guiding both the elevator car and the counterweight.
[0009] The active connection between the balustrade and the guide rail does not have to be permanent. The guide rail can also be actuated by the guide rail engagement devices only temporarily, for example, during certain operating phases of the elevator system (e.g., during a maintenance phase when work is being carried out on the roof). When the active connection between the balustrade and the guide rail is maintained, the balustrade is in the secured position. The balustrade can be moved from the secured position back to a position, for example, for normal operation of the elevator system, in which the active connection is released.
[0010] The balustrade preferably comprises guide rail engagement means, via which the balustrade can be engaged with the guide rail in the secured position such that the balustrade is supported both inwardly and outwardly in the secured position. Thanks to the outward support, it can be ensured that, in the event of horizontal forces acting from the inside outward, for example, if a person leans over the balustrade or falls into the balustrade from the roof, unwanted outward yielding can be easily prevented. Complex, time-consuming, and costly structural measures for the stable design and attachment of the balustrade to the cabin roof can be eliminated.
[0011] The guide rail engagement devices can be located on the handrail of the balustrade. Alternatively, or even additionally, the guide rail engagement devices can be located on horizontal rails below the handrail. Furthermore, it is conceivable to attach the guide rail engagement devices to posts.
[0012] The balustrade can be attached to or adjacent to a roof edge. This roof edge generally runs in a horizontal direction, which direction is referred to below as the lateral longitudinal direction for the sake of simplicity. The guide rail can have a profile section forming a tongue, having a free end and extending in the direction of the lateral longitudinal direction and preferably parallel to the lateral longitudinal direction. In other words, said profile section can run parallel to the adjacent shaft wall. Such a guide rail with a profile section forming a tongue for a tongue-and-groove connection is known, for example, from WO 2020 / 127303 A1. The balustrade comprising guide rail engagement means can be engaged with this profile section.
[0013] However, the balustrade can also be engaged with other sections or parts of a guide rail. For example, if the elevator system has car guide rails with a T-shaped profile, it would be conceivable to use the rail base of the T-rails for the engagement. The rail base can thus obviously also form a profile section extending in the longitudinal direction of the side, preferably parallel to the longitudinal direction.
[0014] To form the guide rail engagement means, the balustrade may have a locking element that can be snapped onto the guide rail, preferably via the aforementioned profile section. Thus, the balustrade can be easily and effortlessly connected to the guide rail, at least temporarily, for maintenance work, using a snap-in or locking mechanism.
[0015] The elevator system can be designed in such a way that at least when the guide rail engagement means are engaged with the guide rail, no maintenance runs are carried out or are possible.
[0016] Furthermore, it may be advantageous if, for the locking connection of the balustrade to the guide rail, the locking element is spring-loaded and secured to the handrail or another part of the balustrade with limited movement. The locking element can be preloaded by a spring. The spring causes the locking element to be preloaded in a locking position. The locking element can have an abutment that can be engaged with the rear side of the profile section of the guide rail. When the balustrade is connected to the guide rail with a locking connection, the locking element is in the locking position and the balustrade is in the advantageous secured position.
[0017] Furthermore, it can be advantageous if the balustrade is designed to be movable. Such a movable balustrade can, for example, be a folding or telescopic or otherwise vertically extendable balustrade. If, for example, the folding balustrade has the locking element described above, the locking connection can be created automatically when the balustrade is moved into the upright position, which corresponds to the balustrade's locking position.
[0018] The locking element can have a wedge-shaped locking lug. The locking lug can form a ramp that interacts with the free end of the profiled section of the guide rail to create the locking connection. The end of the profiled section runs along the ramp and initially pushes the locking lug away. In the locked position, the locking lug is pushed back under the action of the spring.
[0019] The balustrade can have a manually or motor-operated blocking arrangement to form the guide rail engagement means. The blocking arrangement can be moved into a blocking position to create the balustrade's secured position by manual actuation, such as by sliding or pivoting. Instead of manual actuation, however, it may be advantageous for the blocking arrangement to be automatically actuated. The automatic actuation can be activated, for example, as soon as the movable balustrade is brought into the upright position.
[0020] The locking element can, for example, be pivotally mounted on the handrail of the balustrade about a horizontal axis. When the locking element is pivoted out in a horizontal position, it is in the blocking position, and consequently, the balustrade is also in the securing position. By pivoting the locking element, the blocking or securing position can be released again. This locking element can be plate-shaped, at least in the engagement area.
[0021] The blocking arrangement can comprise an actuating lever or lever arm that is rigidly or gear-connected to the locking member. The actuating lever can comprise a handle for manual actuation. Instead of the actuating lever, however, the blocking arrangement can also comprise a comparatively heavy lever arm that, after activation, falls downward under the force of gravity, thus enabling the automatic pivoting of the locking member into the blocking position to create the secure position in a simple manner. In an alternative embodiment, the balustrade can comprise an inclined beam on which the locking member is mounted so that it can be displaced between the rest position and the blocking position.In a further embodiment, the blocking arrangement may include a U-shaped engagement channel which, when the blocking arrangement is in the blocking position, engages around said profile section of the guide rail or another section or part of the guide rail from the side, resulting in the securing position of the balustrade.
[0022] Further advantages and individual features are evident from the following description of exemplary embodiments and the drawings. They show:
[0023] Fig. 1: a simplified plan view of an elevator system according to the invention,
[0024] Fig. 2: a highly simplified side view of another elevator system,
[0025] Fig. 3: a perspective view of a car roof of an elevator car for an elevator system according to a further embodiment,
[0026] Fig. 4: a plan view of an elevator system, wherein the elevator system has a balustrade which is operatively connected to the guide rails by means of engagement means,
[0027] Fig. 5: a manually operable guide rail engagement means in a rest position,
[0028] Fig. 6: a detailed view of a guide rail in cross section and a balustrade in a securing position according to another embodiment,
[0029] Fig. 7: an enlarged perspective view of the guide rail engagement means from Fig. 6,
[0030] Fig. 8: a perspective detailed view of a balustrade engaging with a guide rail according to a further embodiment, Fig. 9: a front view of a further guide rail engagement means in a rest position,
[0031] Fig. 10: the guide rail engagement means of Fig. 9 in a rear view,
[0032] Fig. 11: the front view of the guide rail engagement means in a blocking position (balustrade in securing position), and
[0033] Fig. 12: the activated safety device of Fig. 11 in the rear view.
[0034] Fig. 1 shows an elevator system, designated overall by 1, for a multi-story building. The elevator system 1 contains an elevator car 2 that can be moved vertically up and down in an elevator shaft 3 for transporting people or goods to individual floors. The elevator car 2 is connected via support means (not shown here; however, see Fig. 2 below, in which the support means are designated by 7) to a counterweight 4 that can be moved up and down in the opposite direction to the elevator car 2. Both the elevator car 2 and the counterweight 4 are each guided on guide rails. The guide rails for guiding the elevator car are designated by 5. The guide rails for the counterweight 4 are the guide rails 6. The guide rails 5 and the guide rails 6 are each formed by T-shaped metal profiles. The respective guide rail 5, 6 has a rail base and a rail web projecting at right angles from this.The rail base serves to secure the guide rail in the elevator shaft, while the rail web provides the actual guidance. For this purpose, the rail web has guide surfaces along which sliding or roller guide shoes (not shown) assigned to the elevator car 2 or the counterweight 4 can slide in a conventional manner.
[0035] A balustrade 10 is installed on the cabin roof 9 to provide fall protection. The balustrade 10 demarcates a walkable, interior area on the roof 9 from the outside. The balustrade 10 has guide rail engagement means, designated 11, via which the balustrade 10 interacts with the guide rail in a special manner. Via these engagement means 11, the balustrade 10 can be engaged with the guide rail 5 such that the balustrade 10 is supported inwardly (or, more precisely, in the direction of the interior area). The guide rail engagement means 11 have a blocking arrangement with a U-shaped engagement channel that surrounds the rail base of the guide rail 5 from the side. Fig. 1 shows not only a blocking position in which the engagement is present (balustrade in securing position), but also a rest position of the guide rail engagement means 11 is indicated by an arrow.The engagement can be released by pivoting the locking assembly in the direction of the arrow. In this position, the locking assembly is in a rest position.
[0036] The balustrade is evidently mounted adjacent to a roof edge designated 13, which runs in a lateral longitudinal direction. The rail web of the guide rail 6, formed by a T-profile, forms a profile section with which the guide rail engagement means 11 can be brought into engagement with the U-shaped engagement channel 16.
[0037] In the elevator system 1 shown in Fig. 1, the counterweight 4 is arranged on one side of the elevator car 2. On this side, the balustrade 10 for fall protection is arranged on the roof 9. It is operatively connected to the guide rail 5 via guide rail engagement means 11, the structure and operation of which are shown and explained in detail below. In the front area near the car door 8 and on the opposite rear side, no balustrade components are necessary due to the narrow gap widths.
[0038] For fall protection, hybrid designs combining innovative and conventional balustrades are also conceivable. For example, in this example, a conventional balustrade 10' is provided on the opposite side of the elevator car 2, where the guide rail designated 5' for guiding the elevator car 2 is located. Of course, this balustrade 10' could also be equipped with guide rail engagement means 11, which are explained in detail below.
[0039] The balustrade 10, equipped with guide rail engagement means 1, is generally suitable for all types of elevator configurations or types. Instead of the elevator configuration shown in Fig. 1 with the counterweight arranged on the side of the car, the novel balustrade 10 can also be used, for example, in elevator systems in which the counterweight 4 is arranged in the area of the rear of the elevator car 2.
[0040] Maintenance work is preferably carried out when the elevator car is stationary. However, maintenance trips can also be performed if necessary. There are regulations, such as those in the European standard EN81-20:2014, which stipulate that the horizontal distance between the handrail and the guide rail or other parts in the elevator shaft should not be less than a certain value (e.g., 10 cm according to section 5.4.7.4 lit. a of EN81-20). Since the horizontal distance between the handrail 14 and the guide rail 5 is greater than 10 cm in the embodiment shown in Fig. 1, the safety of the person performing the maintenance would be ensured even during maintenance trips.
[0041] The balustrade 10 shown in Fig. 1 is designed as a rigid balustrade. Depending on the gap width, the balustrade 10 should protrude at least 70 cm, and preferably at least 110 cm, above the roof 9. However, it may also be advantageous to equip movable balustrades with guide elements. Such movable balustrades are used particularly in elevator systems 1, which are characterized by low shaft headroom. As an alternative to the folding balustrade, vertically extendable or telescopically extendable balustrades are also conceivable. Such movable balustrades can also be equipped with the guide rail engagement means 11 described here.
[0042] As can be seen from Fig. 2, guide rail engagement means 11 can also be combined with movable, here foldable, balustrades 10. The balustrade 10 is foldable, i.e., it can be pivoted between a folded-down position, which corresponds to a rest position (as shown in dashed lines in Fig. 2), in which the balustrade is arranged substantially horizontally and thus parallel to the roof 9 of the elevator car 1, and an erected position, in which the balustrade 10 is arranged substantially vertically and thus perpendicular to the roof 9 of the elevator car 2. When the balustrade 10 is erected, the guide rail engagement means 11 act on the guide rail 5. In this position, maintenance work can be carried out on the car roof 9, preferably while the elevator car is stationary.The balustrade 10 is temporarily connected to the guide rail 5 via the guide rail engagement means 11 in such a way that the balustrade is supported inwardly and outwardly. When horizontal forces act from the inside outward, for example, when a person on the roof pushes against the balustrade, the support prevents the balustrade 10 from giving way further, thus securing the person. The inward support ensures that unwanted giving way can be easily prevented when horizontal forces act from the outside inward, for example, when a person pulls on the balustrade.
[0043] Fig. 3 relates to a rigid balustrade 10 which forms a fall protection device on three sides of the elevator car 2. In contrast to the previous embodiments, in the embodiment according to Fig. 3 the balustrade 10 is only supported inwards in the secured position. In the area of a front side, in which the elevator car 2 is equipped with a car door 8, no guardrail is necessary due to the small gap between the car and the shaft wall. The balustrade 5 here comprises, for example, a total of four vertical posts, with two posts each connected to each other by three horizontal beams 14, 16, 17. The uppermost beam is a handrail 14. However, the balustrade 10 could also have only one handrail 14 on each side and a central beam at mid-height. It would also be conceivable to provide additional vertical struts to increase the stability of the balustrade.
[0044] The balustrade 10 typically has two guide rail engagement means 11, which are operatively connected to the respective guide rails 5 such that the balustrade 10 is supported inwardly in the secured position. For clarity, only the left guide rail 5 and the corresponding guide rail engagement means 11 are shown in Fig. 3. The elevator installation 1 has a similarly designed guide rail on the opposite, right-hand side. The guide rail engagement means 11 are clearly arranged on the respective handrails 14 of the balustrade 10. The elevator installation 1 can—as in Figs. 1 to 3—comprise car guide rails 5 that have a T-profile shape, in which guide rails the rail base of the T-rails is used for the application or engagement of the guide rail engagement means 11.In this example, the guide rail engagement means 11 are slidably mounted on the handrail 14. The engagement can be released by moving them in the direction of the arrow. Various design variants of the guide rail engagement means 11 are shown and described below, which interact with specially designed guide rails 5.
[0045] Fig. 4 shows an elevator car 2 for an elevator system 1, which has two counterweights 4, 4' as well as (not shown) suspension elements and drives. The two drives (e.g., traction sheave drives) drive the respective suspension elements (e.g., belts, steel cables) and thus move the elevator car 2 and the two counterweights 4 and 4' in opposite directions. Each drive is assigned to one of the counterweights 4, 4'. Two guide rails 5, 5' are provided on both sides of the elevator car to guide the elevator car 2 and the counterweights 4, 4'.
[0046] Two guide rails 5, 5' are provided on both sides of the elevator car 2 to guide the elevator car 2 and the counterweights 4, 4'. These guide rails 5 serve as linear guides for both the elevator car 2 and the respective counterweights 4, 4'. The guide rails 5 are manufactured as one-piece rolling profiles. The elevator system 1 is designed as a so-called "front bag elevator." Further details on the front bag elevator and the guidance of the car and counterweights with shared guide rails can be found in WO 2020 / 127303 A1 and WO 2020 / 127787 A1.
[0047] The guide rail 5 (the same applies to the guide rail 5') has a profile section designated 18, which forms a tongue for a tongue-and-groove connection. This profile section 18 forms an active surface on which a cabin brake or safety gear acts in an emergency or braking situation. The profile section 18 obviously runs parallel to the lateral longitudinal direction. This lateral longitudinal direction is the direction in which the roof edge 13 runs. For better understanding, a Cartesian coordinate system with the axes x, y, and z is shown in Fig. 3. The lateral longitudinal direction runs in the x-direction; consequently, the profile section 18 also runs in the x-direction. The profile section 18 can be used not only to brake the cabin, but can also be used to support the balustrade 10.For this purpose, the balustrade 10 has engagement means 11 that engage with the guide rail 5 in such a way that the balustrade 10 is supported both inwardly and outwardly. The balustrade 10 is thus locked in the secured position by the guide rail 5.
[0048] The guide rail engagement means 11 are designed as blocking arrangements 20. The blocking arrangement 20 has—similar to Fig. 1—a horseshoe-shaped or U-shaped, channel-like engagement section 16 that surrounds the profile section 18 of the guide rail 5 from the side. When the balustrade 10 and guide rails 6 engage, a locking position is created. The engagement can be permanent or temporary for carrying out maintenance work. The exemplary embodiments shown below in Figs. 6 to 12 relate to variants in which the engagement is only temporary. Maintenance work is preferably carried out when the elevator car is stationary. A safety device connected to the drive unit can prevent unwanted car travel during the maintenance phase.It would even be conceivable to provide guide rail engagement means 11 that engage with the guide rail not only temporarily, but permanently. In this case, the guide rail engagement means 11 could also assume a guiding function.
[0049] Fig. 5 shows a possible structural design of a blocking arrangement 20 for forming guide rail engagement means 11 for an elevator installation 1 in the manner of Fig. 4. The blocking arrangement 20 comprises a component made of sheet metal, which forms the channel-like engagement section 16 complementary to the profile section 18 (not shown here) of the guide rail 5. In Fig. 4, the blocking arrangement 20 is in a rest position. This position is associated with normal operation of the elevator installation. For maintenance work, the blocking arrangement 20 can be moved into the blocking position. In the blocking position, the balustrade 10 is secured; the balustrade 10 is then in the securing position. In the present exemplary embodiment, the blocking arrangement 20 is pivotally attached to the handrail 14. The pivot axis is designated S.By pivoting in the direction of the arrow, the blocking arrangement 20 can be brought into the blocking position and thus the securing position of the balustrade 10 can be created.
[0050] Fig. 6 shows a guide rail that is configured approximately the same as that of the previous embodiment shown in Fig. 4. Here, however, the engagement or operative connection between balustrade 10 and guide rail 5 is achieved via a locking mechanism. To form the guide rail engagement means, balustrade 10 has a locking element 12 that can be locked into guide rail 5 via its profile section 18. Locking element 12 has a wedge-like locking lug 17. Locking lug 17 forms a ramp that interacts with the free end of profile section 18.
[0051] This variant, with the locking element 12 that can be snapped onto the guide rail 5, is particularly suitable for folding balustrades 10. When moving, or more precisely, folding the balustrade 10 from the folded-down position to the upright position, the snap-in connection is automatically created. For this purpose, as can be seen from Fig. 6, the balustrade 10 is advantageously positioned almost flush with the edge of the roof 9.
[0052] In the secured position shown in Fig. 6, the profile section 18 is clamped between the outer side of the handrail 14 and the locking element 12 in the secured position. Since the horizontal distance between the handrail 14 and the guide rail 5 is evidently less than 10 cm, to protect the person passing through the maintenance, it should be ensured, if possible, that the elevator car is not moved up or down during the maintenance phase.
[0053] Further details of the locking mechanism for the guide rail engagement means 11 can be seen in Fig. 7. The locking element 12 is spring-loaded and secured to the handrail 14 with limited movement. Reference numeral 25 denotes a release lever with which the locking element 12 can be moved to the right, thus releasing the locking connection or the blocking position and thus canceling the secured position of the balustrade 10. After completion of the maintenance work, the balustrade can be moved from the upright position back into the folded-down position for normal operation simply by placing it down.
[0054] A further variant of a guide rail engagement means 11 is shown in Fig. 8. Here, the guide rail engagement means 11 comprises a locking member designated 21, which can be moved from a rest position designated PI into the blocking position P2 shown in Fig. 8. For this purpose, the locking member 21 is displaceably mounted on an inclined rail 31 of the balustrade. To automatically create the blocking position P2, the locking member 21 can be moved via an actuating mechanism having spring means, which can be activated via a trigger element 26. When the foldable balustrade 10 is folded up, the trigger element 26 contacts the guide rail 5, whereupon the spring force of the spring means moves the locking member 21 into the blocking position.
[0055] The embodiment according to Figs. 9 to 12 shows a variant with a gravity-based actuation mechanism. The blocking arrangement 20 for the engagement means 11 has a locking member 21 that can be pivoted between a rest position and a blocking position to create the secured position. The locking member 21 is pivotally mounted on the handrail 14 about a horizontal axis. The plate-shaped locking member 21 is rigidly connected to a lever arm 27. The lever arm 27 is secured in the rest position in a holder 26. As soon as the balustrade 10 comes into contact with the guide rail 5 when it is folded up, the holder 26 is displaced outwards, whereby the locking of the lever arm 27 is released and the lever arm swings downwards. Fig. 9 shows the blocking arrangement 20 shortly before the balustrade 10 is fully folded up. Fig. 10 is a rear view of the blocking arrangement 20 in the same position as in Fig. 9.To reliably trigger the safety device, the blocking arrangement 20 has a plunger-like contact element (not shown). This contact element is connected to the bracket 26. When the handrail 14 strikes the guide rail 5 when the balustrade 10 is folded up, the plunger-like contact element is displaced outward together with the bracket 26.
Claims
Elevator system with an elevator car (2) with a roof (9) of the The elevator car (2) is equipped with a balustrade (10) as fall protection for demarcating a walkable, interior area on the roof, wherein the elevator car (2) is movable up and down along guide rails (5), characterized in that the balustrade (10) comprises guide rail engagement means (11) by means of which the balustrade (10) can be supported inwards on one of the guide rails (5). The elevator system according to claim 1 is characterized in that the guide rail engagement means (11) are arranged on the handrail (14) of the balustrade (10). Elevator system according to claim 1 or 2, wherein the balustrade (10) is attached adjacent to a roof edge (13) extending in a lateral longitudinal direction, characterized in that the guide rail (6) has a prod section (18) extending in the direction of the lateral longitudinal direction and preferably parallel to the lateral longitudinal direction, and that the balustrade (10) can be brought into engagement with this prod section (18).Elevator system according to any one of claims 1 to 3, characterized in that the balustrade (10) has a locking element (12) for forming the guide rail engagement means, which can be snapped into the guide rail (5). Elevator car according to claim 4, characterized in that, for snapping the balustrade (10) to the guide rail (5), the locking element (12) is resiliently and with limited displacement attached to the handrail (12). Elevator system according to any one of claims 1 to 5, characterized in that the balustrade (10) is designed to be movable, wherein the snap connection is automatically established when the balustrade (10) is moved.
7. Elevator system according to one of claims 4 to 6, characterized in that a locking element (12) has a wedge-shaped locking lug (17).
8. Lifting system according to claim 1 or 2, characterized in that the balustrade (10) has a blocking arrangement (20) for forming the guide rail engagement means.
9. Elevator system according to claim 8, characterized in that the blocking arrangement (20) has a locking element (21) that can be pivoted or moved between a rest position and the blocking position.
10. Lifting system according to claim 9, characterized in that the locking element (21) is pivotably mounted about a horizontal axis on the handrail (14) of the balustrade (10).
11. Lifting system according to claim 9 or 10, characterized in that the blocking arrangement (20) has an actuating lever or lever arm (27) that is rigidly connected to the locking element (21) or connected via a gear mechanism.
12. Lifting system according to claim 9, characterized in that the balustrade () has an inclined beam (21) on which the locking element (21) is slidably mounted.
13. Lifting system according to claim 8 or 9, characterized in that the blocking arrangement (20) includes a U-shaped engagement channel (16) which, when the blocking arrangement (20) is in a blocking position, engages the profile section (18) of the guide rail (5) from the side.