Car of an elevator system, in particular an installation car

Abstract

The following descriptions relate to a car (14) for an elevator system (1) with a deflection means (18) for receiving a lifting element (16), comprising a drive device (15) for receiving a first section (16.1) of the lifting element (16) and for moving the car (14), a receptacle (30) for an end of a second section (16.2) of the support means (16), wherein the receptacle (30) is spaced apart from the car (14) by means of a first spring element (32), such that a weight force of the car (14) causes a change in the distance opposite the first spring element (32), a release element (41) arranged between the receptacle (30) and the car (14) and a sensor (44) arranged on the car (14) or the receptacle (30), wherein the release element (41) and the sensor (44) are designed and positioned relative to each other such that the sensor (44) is triggered by the release element (41) when a defined distance between the receptacle (30) and the car (14) is reached in order to detect an excess weight of the car (14).

Description

Technical field

[0001] The following descriptions relate to a car for an elevator system with an elevator shaft and a deflection device arranged at an upper end of the elevator shaft for receiving a lifting element hanging in the elevator shaft, the car having a drive device for receiving a first section of the lifting element and for moving the car on the lifting element and a receptacle held on the car for one end of a second section of the lifting element.

[0002] Furthermore, the following descriptions relate to an elevator system comprising an elevator shaft, a shaft ceiling with a deflection device attached to it, a support device wherein the support device is guided on the deflection device and hangs down into the elevator shaft with a first leg and a second leg respectively, and at least one elevator car. Technical background

[0003] Elevator systems for transporting people and / or goods are an integral part of modern residential and commercial buildings. A typical elevator system comprises one or more elevator shafts, in each of which one or more cars are moved between landing positions by means of drives such as suspension drives or linear drives.

[0004] In tall buildings or those built underground, it is known to use the elevator shaft of an elevator system for transporting construction personnel even during the building's construction phase. As construction of such a building progresses, the elevator shaft is progressively lengthened, with the usable travel distance of the elevator car being regularly extended to serve the newly added floors. For this purpose, movable platforms are known that limit the usable travel distance and, in particular, accommodate components of the elevator system. Such platforms are moved into a newly constructed shaft section to extend the usable travel distance and, for example, form a movable machine room located above the elevator car.

[0005] In elevator systems known as "shaft climbers," extending the elevator shaft or travel path is relatively complex. It is common practice to use an installation car for installing components in new sections of the elevator shaft. Such an installation car is typically designed to be as simple as possible and therefore has a low permissible load capacity. For the safe operation of the installation car, it is necessary to monitor its actual load capacity, for which weight sensors are commonly used. However, these weight sensors are relatively expensive and complex to install and maintain.

[0006] Based on this situation, the task at hand is to propose a simple and cost-effective method for monitoring the load capacity of a previously described elevator car. Description - Technical Solution

[0007] The present problem is solved by the features of the independent claims. Advantageous embodiments are specified in the dependent claims, the description, and the drawings. Where technically feasible, the teachings of the dependent claims can be combined arbitrarily with those of the main and dependent claims.

[0008] In particular, the problem is solved by a car for an elevator system with an elevator shaft and a deflection device arranged at an upper end of the elevator shaft for receiving a lifting element suspended in the elevator shaft, the car having a drive device for receiving a first section of the lifting element and for moving the car on the lifting element, a receptacle held on the car for an end of a second section of the lifting element, wherein the receptacle is spaced apart from the car by means of at least one first spring element, such that a weight force of the car causes a change in the distance between the car and the receptacle opposite to the at least one first spring element, a release element arranged between the receptacle and the car, and a sensor arranged on the car or the receptacle, wherein the release element and the sensor are designed and positioned relative to each other in such a way as tothat the sensor is triggered by the triggering element when a defined distance between the sensor and the elevator car is reached, in order to detect an overload of the elevator car.

[0009] The following sections explain advantageous aspects and subsequently describe preferred modified embodiments. Explanations, particularly regarding advantages and definitions of features, are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be explicitly stated.

[0010] Where ordinal numbers, such as "first," "second," etc., are used, for example to designate a component, an element, a process step, or a process action, these ordinal numbers are solely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that a device does not need to have a "first component" to have a "second component." A device can also have a "first component" and a "third component" without necessarily having a "second component." Multiple units with the same ordinal number are also possible, for example, multiple "first components."

[0011] According to the present understanding, an elevator system is designed, for example, with at least one elevator shaft and at least one car that can travel along a route in the elevator shaft, and can furthermore have several parallel routes in one elevator shaft with at least one car per route, as well as several elevator shafts with additional cars.

[0012] For example, an elevator car is held by a suspension element and has a drive device that moves it along the suspension element, or a drive device is provided on the shaft side that drives the suspension element and thus the elevator car. In the first case, the suspension element encircles a deflection element, such as a pulley, located at the top of the elevator shaft and is thus held there, with one section of the suspension element fixed to the elevator car and the other section being movable relative to the elevator car by means of the drive device.

[0013] In the second case, the drive device is located, for example, in the head of the elevator shaft or in a machine room situated above the elevator shaft or travel path, and transmits a drive torque to the load-bearing element. The load-bearing element is in contact with the drive device, for example, via friction or positive locking, such as with a drive zone or a drive sheave of a drive shaft. In the case of a drive device located in the elevator shaft, the load-bearing element is also preferably connected to a counterweight associated with the elevator car.

[0014] A load-bearing element is, in particular, designed as a rope, belt, strap, chain, or the like, and carries tensile loads in the direction of its longitudinal extension. A section of a load-bearing element is understood to be a segment of the load-bearing element extending on a first side of the deflection element, with a second section extending on a second side of the deflection element. The sections run, in particular, parallel to each other.

[0015] An elevator shaft is a shaft that extends over several floors of a building and has a cross-section designed for the passage of the elevator car. A travel path within the elevator shaft is defined in particular by one or more guide rails and end boundaries formed by a shaft floor and / or a shaft ceiling, which in the case of a shaft climber may each be designed as movable platforms.

[0016] Insofar as reference is made to an elevator system in a building under construction, the relevant relationships are explained below with reference to a building extending upwards from ground level. These relationships apply analogously to a building constructed downwards into the ground. In the case of an elevator system that grows with a building under construction, a shaft climber, the travel path extends, for example, between the lowest landing position and a landing position on an already constructed floor. A machine room platform is located on or above this floor, housing the drive mechanism of a car that travels below.The elevator car is suspended from the drive mechanism via a suspension system and serves, for example, to allow construction personnel easier access to an active construction section during daily work and to transport building materials to this section. As additional floors of the building are constructed, the machine room platform is moved further upwards to provide access to landing positions for the new floors and thus subsequent construction sections via the elevator shaft. The elevator shaft is therefore extended to accommodate the newly constructed floors and landing positions. For this purpose, an installation car is provided in the elevator shaft, specifically above the machine room platform. This car allows for shaft installations in newly constructed shaft sections and can assist in the relocation of the machine room platform.

[0017] An installation car is generally defined as one designed for installing elevator components within the elevator shaft. The installation car may be intended solely for installation work, without being equipped for the (later) regular operation of the elevator, or it may be equipped for both purposes and used as a regular elevator car after installation. In particular, in the case of a shaft climber, an installation car is suspended from a shaft platform and has a drive mechanism that allows it to ascend or descend along a support element guided on the shaft platform, with the installation car being guided, in particular, by guide rails already installed in the elevator shaft.The installation car, for example, is designed to be more open, allowing access to the walls of the elevator shaft from the installation car for shaft installations. For instance, the installation car's lifting capacity is only designed for loads necessary during installation, such as for one person and / or a specific quantity of work materials.

[0018] A receptacle for the end of the second strand is designed such that the second strand can be securely fixed to it in the region of its end. In the case of a load-bearing rope, a receptacle comprises, in particular, a cable block, and in the case of a load-bearing strap, a clamping device.

[0019] A sensor can be designed, for example, as a push button that is triggered by pressing or releasing a tactile element. Triggering thus corresponds to detecting a press on or release of the tactile element. For example, the tactile element closes an otherwise open circuit. A sensor can also be designed in other ways and, in particular, utilize optical, magnetic, or electromagnetic operating principles. A triggering element is designed such that a change in the distance between the elevator car and the mounting, contrary to the at least one first spring element, results in a change in the positional relationship between the triggering element and the sensor, which ultimately triggers the sensor. The triggering element is therefore designed, for example, as a cantilever, a lever, or the like.

[0020] The solution to the problem with the aforementioned elevator car involves the teaching that the end of the second leg of the suspension system is suspended from the elevator car by means of spring elements, such that the spring element is compressed or extended accordingly with increasing weight. The resulting distance between the mounting point and the elevator car is directly proportional to the weight of the elevator car and can be easily detected by sensors. The elevator car is thus suspended from the suspension system via the spring element. By placing a sensor at the mounting point and a corresponding release element, the weight of the elevator car can be detected in a simple and cost-effective manner with regard to whether a weight limit is exceeded, and the permissible load capacity for the elevator car can therefore be easily monitored. Operation of the elevator car is then prevented if the load capacity is exceeded.

[0021] Alternatively or additionally, the car may be designed as an installation car for an elevator system under construction. Such an installation car can be particularly simple and have a very low load capacity, making cost-effective load monitoring and its resulting advantages especially important. In particular, the load capacity of a drive unit used in an installation car is typically very limited to keep costs down. Cost-effective load monitoring allows this low load capacity to be monitored, enabling the installation car to be designed cost-effectively overall.

[0022] Alternatively or additionally, the suspension element can be designed as a suspension rope, with the end of the second leg being received at the receiver via a linkage with a cable block attached to it. The end is then securely fastened to the car with a high possible force transmission, and the cable block can also be positioned sufficiently high by the linkage to keep the suspension rope itself free from potentially damaging contact with car components surrounding the receiver, for example, in the event of oscillations of the suspension rope or the car on the suspension rope.

[0023] Alternatively or additionally, the mounting can be arranged on the floor of the car. The first spring element is then subjected to compression by the weight of the car, or the distance defined by the first spring element is reduced by an increase in weight. The first spring element can then be of a particularly simple design and arranged on the mounting or the car. Furthermore, if the car has one end of the suspension system fixed to the floor, it can be guided at several points along the suspension system.

[0024] Alternatively or additionally, the mounting can be provided with a first plate, which is held relative to the car by means of at least three spring elements. The first mounting can then be attached to the spring elements in a simple and stable manner, dependent on the force of gravity, thereby achieving a precise relationship between the force of gravity and the distance between the first plate and the car. Furthermore, other car components can be easily arranged on a first plate.

[0025] Alternatively or additionally, the release element can be arranged on the first plate. Advantageously, the release element can be arranged simply and flexibly on the first plate.

[0026] Alternatively or additionally, the first plate can be held relative to a second plate by means of the first spring elements, the second plate being spaced from the elevator car by at least three sleeves with second spring elements attached to them. The first and second spring elements are then dimensioned relative to each other such that, when the elevator car is suspended in the lifting mechanism, the second spring elements are compressed to such an extent that the second plate rests against the sleeves, which in turn rest against the elevator car. The first plate is thus indirectly attached to the elevator car via the second plate and the sleeves under load.When the force is applied by the car suspended in the lifting mechanism, the second plate is fixed in its position by the sleeves, but is pushed away from the car by the second spring elements when the lifting mechanism is relieved, for example in the event of a crack in the lifting mechanism, so that a crack in the lifting mechanism can be detected based on the position of the second plate.

[0027] Alternatively or additionally, the second plate can be connected to a linkage of a safety gear. The linkage is then arranged on the second plate in such a way that, in the event of a break in the load-bearing element, the second plate actuates the linkage to trigger the safety gear. In particular, the linkage can have an additional lever arm by means of which it can be manually actuated from inside the elevator car, preferably without the second plate being spaced apart from the elevator car.

[0028] Alternatively or additionally, the sensor can be arranged on the second plate. The sensor can be advantageously positioned and attached to the second plate easily and with sufficient clearance from the triggering element.

[0029] Alternatively or additionally, the extension of the release element can be designed to be adjustable for setting a release weight for the car. This advantageously allows the same assembly of mounting, spring elements, sensor, and release element to be used for cars with different load capacities. For example, the extension of the release element can be easily adjusted by weighting the car up to its load capacity limit, taking into account a tolerance in the load capacity limit. With the car weighted, the extension of the release element is then adjusted so that it just triggers the sensor.

[0030] Alternatively or additionally, the triggering element can be provided with a trigger curve, wherein a trigger button guided by the trigger curve is spaced relative to the sensor depending on its position on the trigger curve. The trigger button, which is, for example, located between the sensor and the triggering element or on the sensor itself, thus follows the path of the trigger curve and actuates the sensor when a sufficiently small distance between the trigger curve and the sensor is reached. A trigger curve in conjunction with a trigger button provides a simple, cost-effective, and robust method of triggering the sensor.

[0031] Alternatively or additionally, the at least one first spring element can be designed as a coil spring and mounted on at least one guide pin connecting the mounting to the car. This achieves a linear relationship between the weight of the car and the distance between the mounting and the car, with the coil springs being secured against lateral displacement by the guide pins.

[0032] The problem is further solved by an elevator system comprising an elevator shaft, a shaft ceiling with a deflection element attached thereto, a suspension element, wherein the suspension element is guided on the deflection element and hangs down into the elevator shaft with a first run and a second run respectively, and at least one car as described above, wherein the car is held on the suspension element. Essentially the same advantages as described above for the car can be achieved with this elevator system. In particular, the elevator system is simple and cost-effective.

[0033] Alternatively or additionally, the elevator car can be designed as an installation car, and the shaft ceiling, in particular within the elevator shaft, can be repositioned. For the installation car, which is only used during the construction phase of such an elevator system and for which there are only minimal requirements regarding comfort and user-friendliness, the advantage lies in the fact that expensive components for load monitoring can be dispensed with, which is particularly significant.

[0034] Alternatively or additionally, a machine room platform with a drive device for a further elevator car located below it can be arranged below the installation car, and the machine room platform is designed to be movable within the elevator shaft. Using the machine room platform or a drive device arranged therein, an elevator car can then be used in a completed section of the elevator shaft below the machine room platform to transport construction personnel and building materials during the building construction phase. Brief description of the drawings

[0035] A preferred technical solution is explained in more detail below with reference to the accompanying drawings and preferred embodiments. The term "figure" is abbreviated as "Fig." in the drawings.

[0036] The drawings show Fig. 1 a schematic representation of a lift system designed to be extended as construction progresses during the building process, wherein Fig. 1 shows several steps of such an extension of the travel path in the elevator system; Fig. 2 a perspective view of a car according to the present disclosure, as it is used in an elevator system according to Fig. 1 is used as an installation lift; Fig. 3 a detailed view of the elevator car according to Fig. 2; Fig. 4 another detailed view of the elevator car according to Fig. 2; Fig. 5 another detailed view of the elevator car according to Fig. 2; Detailed description of the drawings

[0037] The described embodiments are merely examples that can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a particular embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a particular claim category can also be used accordingly in an embodiment of a different claim category.

[0038] Fig. Figure 1 shows an elevator system 1 with an elevator shaft 2 extending in the vertical direction V in several states 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, which occur during the extension of a travel path 3 in the elevator shaft 2 during the construction of a building according to the present disclosure. The elevator system 1 has a car 5 that can travel in the travel path 3 between landing positions 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, wherein the travel path 3 initially extends to the second landing position 4.2 in states 1.1 to 1.4 and to the sixth landing position 4.6 in state 1.6. Above the car 5, an engine room platform 6 is arranged as the upper boundary of the travel path 3. This platform is detachably supported in the area of ​​a shaft door opening 7 of the third landing position 4.3, which is initially located outside the travel path 3. Above the engine room platform 6, in the area of ​​a shaft door opening 7, is the fourth landing position 4.4, also initially outside the travel path 3, a lifting platform 10 for raising the machine room platform 6 is detachably supported. The car 5 is held on the machine room platform 6 by means of a lifting element 11 and driven by a drive device 12 located there.

[0039] Above the fourth landing position 4.4, five further floors with landing positions 4.5, 4.6, 4.7, 4.8, and 4.9 were constructed, the respective landing positions 4.5, 4.6, 4.7, 4.8, and 4.9 being defined by shaft door openings 7. In the area of ​​landing positions 4.5, 4.6, 4.7, 4.8, and 4.9, an installation car 14 is movably arranged, the installation car 14 having a drive device 15 and supported by a support element 16. The support element 16 is held on a shaft platform 17, which is detachably supported in the area of ​​a shaft door opening 7 of the ninth landing position 4.9, and is deflected by a deflection device 18 located there. The support element 16 has a first section 16.1 on one side of the deflection element 18 and a second section 16.2 on the other side of the deflection element 18. The shaft platform 17, in turn, has only a few components.The components arranged thereon can be installed on the shaft platform 17 with minimal effort, making the shaft platform 17 relatively light and allowing it to be moved manually or with minimal machinery to the next higher landing position 4.5, 4.6, 4.7, 4.8, 4.9. In addition to the deflection device 18 for the lifting element 16, a first lifting device 19.1 and a second lifting device 19.2 are arranged on the shaft platform 17, by means of which a first crane hook 20.1 and a second crane hook 20.2 can be raised. The installation car 14 and the car 5 are guided on guide rails 21.1, 21.2, with corresponding guide elements 24 of the installation car 14 arranged on a lower or downwardly extending area of ​​the installation car 14.

[0040] In the first stage 1.1 of the extension of the travel path 3, guide rail sections 23 are installed in the area of ​​the newly constructed landing positions 4.4, 4.5, 4.6, 4.8, 4.9 using the installation car 14 to extend the guide rails 21.1, 21.2 along the newly constructed landing positions 4.5, 4.6, 4.7, 4.8, 4.9. In the second stage 1.2 of the extension of the travel path 3, the installation car 14 is moved downwards towards the lifting platform 10 after the installation of the guide rails 21.1, 21.2 is completed. In the third stage 1.3 of the extension of the travel path 3, the installation car 14 is connected to the lifting platform 10. The lifting platform 10 has a lifting device 10.1 for raising the engine room platform 6, which, however, is not (yet) connected to the engine room platform 6 in the third state 1.3. In the fourth state 1.4. During the extension of the travel path 3, the lifting platform 10 is raised to the eighth landing position 4.8 by means of the installation car 14. No additional cargo or personnel are provided in the installation car 14, so that the permissible load capacity of the installation car 14 or the drive unit 15 is sufficient to raise the lifting platform 10. The load capacity of the installation car 14 is monitored during the raising of the lifting platform 10 and also during its use for installing components in the elevator shaft 2, as described below, so that the installation car 14 can only be moved in all states 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 and beyond if it does not exceed its permissible load capacity. In the fifth state 1.5 of the extension of the travel path 3, the lifting platform 10 is supported in the area of ​​the shaft door 7 of the eighth landing position 4.8 and the engine room platform 6 is attached to the lifting device 10.1. The engine room platform 6 is engaged, with the lifting device 10.1 raising it to the seventh landing position 4.7. In the sixth state 1.6, the engine room platform 6 is supported in the seventh landing position 4.7, thus extending the travel path 3. The car 5 can now be moved to the sixth landing position 4.6.

[0041] The Fig. 2 and Fig. Figure 3 shows the installation car 14 in detail. It is open on all sides to allow for the installation of components in the elevator shaft 2 and also has guide elements 24 for guidance along the guide rails 21.1, 21.2. The drive device 15 acts on the first leg 16.1 of the load-bearing element 16, the first leg 16.1 passing through a guide roller 25 located under a floor 14.1 of the installation car 14 and then terminating freely below the installation car 14 (not shown in detail). The second leg 16.2 of the load-bearing element 16 is connected to a weight monitoring device 27, also located below the floor 14.1, as described below with reference to the Fig. 4 and Fig. 5 is explained in more detail. The elevator system 1 also has a safety rope 28 held on the shaft platform 17, on which a rope brake 29 is arranged as an emergency brake for the installation car 14. The safety rope 28 is kept under tension by a tension weight 28.1.

[0042] The Fig. 4 and Fig.Figure 5 shows the weight monitoring device 27 in detail. The weight monitoring device 27 has a receptacle 30, which consists of a first plate 30.1, a linkage 30.2 held thereto, and a cable block 30.3 held on the linkage 30.2 for receiving the second section 16.2. The first plate 30.1 is supported against a second plate 34 by four first spring elements 32, designed as coil springs and guided on guide pins 33. The first spring elements 32 and the weight of the installation cage 14 acting on them press the second plate 34 against four second spring elements 35, also designed as coil springs. Due to the first spring elements 32 being stronger than the second spring elements 35, the second plate 34 rests against sleeves 36 that receive the second spring elements 35.If the weight of the installation car 14 changes, the distance between the first plate 30.1 and the second plate 34 changes proportionally, while the second plate 34 remains in contact with the sleeves 36. The second spring elements 35 can only be triggered in the event of a tear or other loss of tension in the lifting element 16, and then push the second plate 34 away from the floor 14.1 of the installation car 14 in order to actuate a linkage 38 of a safety gear (not shown) via a lever 38.1 to trigger the safety gear. The linkage 38 can also be manually actuated from inside the installation car 14 via a lever 38.2.

[0043] According to the present disclosure, a release element 41, designed as a cantilever, is arranged on the first plate 30.1. The release element 41 has a release curve 41.1 in its upper region and its extension is adjustable via screws 42. A release button 43 is arranged in the region of the release curve 41.1 and rolls along the release curve 41.1. If the weight of the installation car 14 increases up to its permissible load capacity, the release button 43 is moved by the release curve 41.1 to such an extent that it actuates a sensor 44 designed as a push button. The distance between the first plate 30.1 and the second plate 34, and thus the weight of the installation car 14 at which the sensor 44 is triggered, can be adjusted by means of the screws 42. If sensor 44 is activated, this is detected as an overload of the installation car 14 and commissioning of the drive device 15 is prevented. Reference symbol list 1 elevator system 1.1 Initial state of the elevator system during the extension of the travel path 1.2 Second state of the elevator system during the extension of the travel path 1.3 Third state of the elevator system during the extension of the travel path 1.4 Fourth state of the elevator system during the extension of the travel path 1.5 Fifth state of the elevator system during the extension of the travel path 1.6 Sixth state of the elevator system during the extension of the travel path 2 elevator shafts 3 Route 4.1 First landing position 4.2 Second landing position 4.3 Third landing position 4.4 fourth landing position 4.5 fifth landing position 4.6 sixth landing position 4.7 seventh landing position 4.8 eighth landing position 4.9 ninth landing position 5 elevator car 6 Engine room platform 7 Shaft door opening 10 lifting platforms 10.1 Lifting equipment of the lifting platform 11 Lifting equipment 12 Drive device 14 Installation lift 14.1 Floor of the installation elevator car 15 Drive device 16 Lifting devices 16.1 first section of the lifting device 16.2 second section of the lifting device 17 Shaft platform 18 Deflection devices 19.1 first lifting device 19.2 second lifting device 20.1 first crane hook 20.2 second crane hook 21.1 first guide rail 21.2 second guide rail 23 Guide rail section 24 Guide elements of the installation elevator 25 Leadership role 27 Weight monitoring 28 Safety rope 28.1 Tension weight of the safety rope 29 Rope brake 30 recordings 30.1 first plate of the recording 30.2 Rods of the recording 30.3 Rope case of the recording 32 first spring element 33 guide pins 34 second record 35 second spring element 36 Sleeve 38 rods 38.1 Lever of the linkage 38.2 Lever of the linkage 41 Trigger element 41.1 Trigger curve of the trigger element 42 screws for adjusting the release element 43 trigger buttons 44 Sensor V vertical direction

Claims

[1] Car (14) for an elevator system (1) with an elevator shaft (2) and a deflection means (18) arranged at an upper end of the elevator shaft (2) for receiving a support means (16) hanging in the elevator shaft (2), the car (14) having a drive device (15) for receiving a first section (16.1) of the lifting means (16) and for moving the car (14) on the lifting means (16); a receptacle (30) held on the car (14) for an end of a second section (16.2) of the lifting means (16), wherein the receptacle (30) is spaced apart from the car (14) by means of at least one first spring element (32), such that a weight force of the car (14) causes a change in the distance between the car (14) and the receptacle (30) in the opposite direction to the at least one first spring element (32); a release element (41) arranged between the receiver (30) and the elevator car (14); and a sensor (44) arranged on the car (14) or the receiver (30); wherein the triggering element (41) and the sensor (44) are designed and positioned relative to each other such that the sensor (44) is triggered by the triggering element (41) when a defined distance is reached between the receiver (30) and the car (14) to detect an excess weight of the car (14). [2] Carriage (14) according to claim 1, designed as an installation carriage (14) for an elevator system (1) under construction. [3] Carriage (14) according to claim 1 or 2, wherein the support means (16) is designed as a suspension rope and wherein the end of the second run (16.2) is received at the receptacle (30) via a linkage (30.2) with a rope block (30.3) formed thereon. [4] Elevator car (14) according to one of the preceding claims, wherein the receptacle (30) is arranged on a floor (14.1) of the elevator car (14). [5] Carriage (14) according to one of the preceding claims, wherein the receptacle (30) has a first plate (30.1) and the first plate (30.1) is held relative to the carriage (14) by means of at least three first spring elements (32). [6] Elevator car (14) according to claim 5, wherein the release element (41) is arranged on the first plate (30.1). [7] Carriage (14) according to claim 5 or 6, wherein the first plate (30.1) is held relative to a second plate (34) by means of the first spring elements (32) and wherein the second plate (34) is spaced apart from the carriage (14) by at least three sleeves (36) with second spring elements (35) arranged thereon. [8] Carriage (14) according to claim 7, wherein the second plate (34) is connected to a linkage (38) of a safety device. [9] Elevator car (14) according to one of claims 7 or 8, wherein the sensor (44) is arranged on the second plate (34). [10] Carriage (14) according to one of the preceding claims, wherein the extension of the release element (41) for setting a release weight of the carriage (14) is adjustable. [11] Elevator car (14) according to one of the preceding claims, wherein the release element (41) has a release curve (41.1) and wherein a release button (43) guided on the release curve (41.1) is spaced apart from the sensor (44) depending on its position on the release curve (41.1). [12] Carriage (14) according to one of the preceding claims, wherein the at least one first spring element (32) is designed as a coil spring and is received on at least one guide pin (33) connecting the receptacle (30) with the carriage (14). [13] Lift installation (1) comprising an elevator shaft (2); a shaft cover with a deflecting device attached to it (18); a support means (16), wherein the support means (16) is guided on the deflection means (18) and hangs down into the elevator shaft (2) with a first leg (16.1) and with a second leg (16.2); and at least one elevator car (14) according to one of the preceding claims, wherein the elevator car (14) is held on the support means (16). [14] Lifting system (1) according to claim 13, wherein the car (14) according to one of claims 1 to 12 is designed as an installation car (14) and the shaft ceiling is designed to be movable, in particular in the lift shaft (2). [15] Lifting system (1) according to claim 14, wherein a machine room platform (6) with a drive device (12) arranged thereon for a further lifting car (5) of the lifting system (1) arranged below the installation car (14) is arranged and wherein the machine room platform (6) is designed to be movable in the lift shaft (2).

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