Elevator

Abstract

The invention relates to an elevator having an elevator car (3) that can be moved up and down, which elevator comprises deflection pulleys (7, 8), by means of which deflection pulleys (7, 8) the elevator car (3) is suspended on support means (6) in an underlooping manner. At least one of the deflection pulleys (7) is equipped with a load measuring device (20), wherein an axle support part (10), which is formed by a plate and is intended for supporting the axle (11) of the deflection pulley (7) provided for load measurement, is arranged on one of the supports (9), in which axle support part (10) the load measuring device (20) is integrated in the form of a strain gauge sensor. The axle support part (10) is designed as a frame-like plate component having a central cutout (31).

Description

[0001] 2022P00107WÖ

[0002] - 1 -

[0003] Elevator

[0004] The invention relates to an elevator according to the preamble of claim 1. A load measuring device is used to measure a load acting on an elevator car. Load measuring devices of elevators have, among other things, the task of preventing elevator travel with an impermissibly high load and of providing the elevator control system with information that enables it to respond appropriately to call commands from elevator users, depending on the current load state of the elevator car.

[0005] Elevators are typically installed in a building shaft and are used to transport people or goods. The car, which moves up and down vertically in the elevator shaft, is supported by suspension elements, such as ropes or belts, which are connected to a drive mechanism to move the car. The elevator car has a cabin, the interior of which can accommodate people and goods. The cabin typically has a floor, side walls, and a ceiling, as well as one or two cabin doors. The elevator car also has a support structure to carry or brace the cabin. For example, if the elevator car is suspended from the suspension elements in the form of a sling, the support structure is located below the cabin. In a 2:1 suspension, the support structure has two pulleys or...Deflection units are assigned to the support structure, positioned at its ends. These units redirect the load-bearing elements running along the side walls, causing them to run more or less parallel to the floor beneath the cabin. Depending on the number and arrangement of the load-bearing elements, one or more deflection pulleys may be provided at each end. The deflection pulley(s) is / are mounted, for example, using roller bearings, to allow free rotation. The two deflection units can therefore each have one or more deflection pulleys.

[0006] From WO 01 / 83350 A1, an elevator with an elevator car suspended by ropes is known, wherein one of the deflection pulleys is equipped with a load measuring device. An elevator car equipped with a load measuring device is described in which the weight of the car and the payload causes the load-proportional deformation of at least one elastic element, wherein at least one sensor detects this deformation and 2022P00107WÖ

[0007] - 2 - generates a signal representing the degree of deformation and thus the load, which is then sent to an elevator control system. In a first variant, the elevator car has a support structure consisting of a horizontal beam and two pulley supports with deflection pulleys attached to it. Under load, the beam deflects; this deflection is detected by a strain gauge sensor, which generates a signal corresponding to the degree of deflection and thus the total weight of the elevator car as input for an elevator control system. In another variant, where there is no supporting frame, a pulley support is hinged to the mounting beam by means of a bending element and supported against it by a pressure sensor.A third variant, which also lacks a support frame, consists of a pulley support designed as a pivot lever, attached to a torsion bar and rotatably mounted via this bar in a bearing support connected to the mounting bracket. The pulley load resulting from the tensile forces of the supporting cables causes a load-proportional torque on the pulley support, which twists the torsion bar and induces corresponding load-proportional torsional stresses within it. These stresses are measured by a torsional stress sensor.

[0008] It is an object of the present invention to avoid the disadvantages of the known invention and, in particular, to create an improved elevator. The elevator should enable precise load measurement for the elevator car and at the same time be simple in design and easy to assemble and, if necessary, disassemble with regard to the load measuring device.

[0009] This problem is solved according to the invention by an elevator with the features of claim 1. The elevator comprises an elevator car that can be moved up and down and is supported or suspended from load-bearing elements. The elevator car has deflection pulleys over which the elevator car is suspended from the load-bearing elements. The deflection pulleys are arranged between two parallel beams of a support structure for the elevator car, and each deflection pulley is freely rotatable on an axis. In addition to the aforementioned support structure, the elevator car can have a cabin body that defines the space for passengers and goods. The support structure for carrying or bracing the cabin body thus comprises beams extending from one end to the opposite end.To create the underslung structure, for example for a 2:1 suspension system, two deflection pulleys can be arranged between the parallel beams, the deflection pulleys preferably being located in the area of ​​the beam ends. Between the deflection pulleys arranged at the ends of the beams or in the end regions of the beams 2022P00107WÖ.

[0010] - 3 - Additional pulleys, for example, pulleys for tensioning the load-bearing elements on the beam, could be arranged. It is of course conceivable that more than one deflection pulley could be provided at each end of the beam. The beams can be separate components, e.g., steel beams with a C-profile or I-profile. However, it would also be conceivable that the beams are assigned to a common component. For example, the component could be box-shaped and have parallel beam wall sections to form the beams. Deflection pulleys, for example, for creating the undercut, are arranged on the beams between these parallel beams. One of the deflection pulleys is equipped with an East measuring device.

[0011] Several advantages arise from the fact that one of the supports has a plate-like or at least plate-like axle support section for carrying the axle of the deflection pulley used for load measurement, and the load measuring device is integrated into this axle support section. The axle support section is a separate component that is easy to manufacture and handle, allowing for quick and easy assembly. If necessary, the axle support section, along with the load measuring device, can also be easily removed without having to dismantle the entire support structure.

[0012] The axle support component formed by a plate can, for example, be manufactured from a steel plate using machining processes. Alternatively, it can be produced from a metal sheet using stamping processes. This axle support component, which for simplicity will be referred to as the "support plate" below, is a flat component with plane-parallel top and back surfaces. The support plate rests against the beam, typically and more precisely against a vertical section of the beam wall, across its back surface. However, the axle support component does not necessarily have to be a purely flat component. It can be a flat component that, while having a flat underside, does not have to have its top surface lie entirely on the same plane parallel to the underside.For example, the top surface can be segmented, with the segments having different plate thicknesses, such as a flat measuring section and a raised axle support section. Besides being easy to manufacture, the axle support component formed by a plate, or at least plate-like, has the advantage of being a robust and durable component, making it particularly well-suited for precisely measuring elastic deformations for load measurement purposes using appropriate methods. 2022P00107WÖ.

[0013] - 4 -

[0014] The axle carrier component itself, i.e., the axle carrier component without the load measuring device, can be a single-piece component made from one material, e.g., steel. For example, it can be formed from a single sheet metal blank, e.g., a stamped sheet metal part. The axle carrier component should be easy to manufacture and, for example, adapted to the forces to be absorbed and transmitted by a suitable choice of sheet metal, particularly with regard to the thickness and material of the sheet metal.

[0015] The load-dependent deformation of the axle support component can be detected by a sensor. An evaluation unit can then determine the cabin load from the sensor signal, allowing, for example, the elevator control system to prevent elevator journeys with an impermissibly high load. The sensor can be, in particular, a strain gauge sensor.

[0016] The load measuring device is designed to measure loads or forces acting on a part of the load measuring device referred to as the force transmission element. For precise measurement results that accurately reflect the load, it is advantageous if the axle support component is mounted to the support as rigidly and with as little play as possible.

[0017] The elevator can be a machine-room-less elevator or an elevator with a machine room, comprising a drive unit with a traction sheave, the aforementioned elevator car, and a counterweight positioned to the side. The drive unit can power one or more suspension belts or cables via the traction sheave. The elevator car, suspended from the suspension system by means of pulleys, can thus move along vertical guides, for example, in the form of guide rails. Separate guide rails can be provided for the counterweight, which moves in the opposite direction to the elevator car.

[0018] According to a first embodiment, the support has a receiving opening for attaching the axle, which receiving opening preferably extends in a horizontal direction and is open at its end. This support, for example a steel beam extending horizontally from one end to the opposite end, allows the axle with the deflection pulleys mounted on it to be easily attached from the side. This receiving opening, open at the end, can in particular be formed by a horizontal elongated hole into which the axle of 2022P00107WÖ is inserted for mounting the deflection pulley.

[0019] - 5 - can be inserted into the beam from the outside end without having to move the two parallel beams of the support structure, which extend from one end to the opposite end, apart. When an axis is mentioned below, this refers to the axis of the deflection pulley provided for load measurement, i.e., the deflection pulley equipped with the load measuring device. The axis is attached to the beam by means of the axis support section that overlaps the receiving opening. The axis can preferably be received in the receiving opening with some play, so that in the event of elastic deformation due to load changes, the axis does not strike the receiving opening and allows for slight movement.

[0020] Furthermore, it can be advantageous if the axle support component is arranged on the beam at an inclination of preferably 45°. In particular, the preferred inclination of 45° results in optimal force transmission at the interface between the deflection pulley and the elevator car. If the axle support component is a component extending along a longitudinal axis, this longitudinal axis would serve as the reference point for the inclination. At an inclination of 45°, the longitudinal axis of the axle support component would be inclined at 45° to the horizontal. Accordingly, in this arrangement, the load measuring device can efficiently measure forces acting on the elevator car. In particular, load changes in the elevator car can be determined using the load measuring device.

[0021] In a further embodiment, the axle carrier part can have a receiving opening for carrying and fixing the axle to the axle carrier part, into which a screw or other fastening means embedded in the axle is passed. For better understanding and to distinguish it from the receiving opening mentioned above, which, however, belongs to or is provided in the carrier, this receiving opening of the axle carrier part is hereinafter referred to as the axle fixing opening.

[0022] This receiving opening of the axle carrier part, i.e., the axle fixing opening, can be a through hole. However, it is also conceivable that the receiving opening of the axle carrier part, or the axle fixing opening, is designed to allow lateral insertion. In the latter case, the axle carrier part can have two forks, between which the axle fixing opening is formed. 2022P00107WÖ

[0023] - 6 -

[0024] The axle can include a hollow shaft, the hollow shaft being supported on the respective end face of the axle carrier part directly or indirectly via a bushing inserted into the hollow shaft. A clamping screw can pass through the hollow shaft, forming the aforementioned screw for fixing the axle to the axle carrier part.

[0025] Preferably, the axle support component can be designed as a frame-like plate component with a central cutout. This frame-like plate component can consist of an axle holding section with a receiving opening for carrying and fixing the axle to the axle support component, web sections adjoining the axle holding section, and finally a fastening section, wherein the axle holding section, the two web sections, and the fastening section surround the cutout. In other words, the aforementioned web sections connect the axle holding section to the fastening section.

[0026] The axle support component, designed as a frame-like plate component, can comprise two trapezoidal and / or triangular web sections. Preferably, this axle support component can comprise two trapezoidal or triangular web sections. The two trapezoidal or triangular web sections can be symmetrical to each other with respect to their longitudinal axis. However, hybrid forms are also conceivable. For example, one of the web sections can be trapezoidal and the other web section, which is opposite the first web section, can be triangular.

[0027] Furthermore, the axle support component, designed as a frame-like plate component, can comprise two trapezoidal web sections extending along a longitudinal axis, symmetrically designed with respect to the longitudinal axis. The receiving opening for the axle, i.e., the receiving opening for supporting the axle and fixing it to the axle support component, can be designed as an elongated hole extending in a second direction, wherein the longitudinal direction or longitudinal axis and the second direction intersect and preferably form an angle of 45°. Under load, and especially during load changes in the elevator car, a load-proportional force is exerted on the axle support component, which can be measured by means of suitable sensors. The axle support component is elastically deformed under load, and this deformation can be detected, for example, with a strain gauge sensor.

[0028] In particular, the respective trapezoidal web section of the axle carrier part can be described as in We- 2022P00107WÖ

[0029] - 7 - The axial support section is designed as an isosceles trapezoid. Preferably, the axle support section is designed as a double trapezoid in the area of ​​its web sections, whereby these can be designed such that the longer bases of the two trapezoids run parallel to each other or even coincide. The bases of the trapezoids run parallel to the aforementioned longitudinal axis.

[0030] Preferably, the trapezoidal parts can be identical, in particular as two identical isosceles trapezoids. Equally preferred is the absence of the two longer bases of the trapezoids; in other words, the axle support part is designed as a kind of double trapezoid, i.e., a polygon, where this polygon consists only of the shorter bases and the legs of the two trapezoids, with the two longer bases either not being formed or only being virtually formed. This has the advantage that the polygon is deformable in a defined direction of force, which generally corresponds to the longitudinal axis of the axle support part.

[0031] In one embodiment, the load measuring device can be arranged between the opposing web sections and, in particular, between the two shorter base sides of the trapezoids, so that a change in the distance between the two shorter base plans can be measured by the load measuring device.

[0032] In one embodiment, the axle support component can have at least two bores or other means for fastening it to the support in the area of ​​the mounting section. The bores are preferably arranged such that a line passing through the two bores is essentially perpendicular to the longitudinal axis, i.e., to the desired direction of force. The aim is to fix the axle support component firmly to the elevator car and thus to the support in the direction of the acting force, so that a change in load leads only to elastic deformation of the axle support component and not to displacement. This can be easily achieved by two fastening elements corresponding to the bores, such as pins, screws, or bolts, which are preferably mounted on a line perpendicular to the direction of force.

[0033] According to a preferred embodiment, the axle carrier part is arranged, dimensioned and configured such that the axle carrier part, in the event of a movement between the deflection pulley and 2022P00107WÖ

[0034] - 8 - the force transmitted to the axle support part, which corresponds to the weight of the elevator car including a maximum permissible payload of the elevator car, is deformed essentially exclusively elastically. Preferably, the axle support part formed by a plate and at least plate-like is designed, that is, dimensioned and / or shaped in terms of material and thickness, such that it experiences only elastic deformation under forces that typically occur during normal operation of the elevator system.

[0035] In particular, according to one embodiment, the axle support component can be dimensioned such that its web sections deform by less than 1 mm, preferably less than 0.5 mm, and more preferably only between 0.05 mm and 0.3 mm, in the direction of the force when a force is transmitted between the deflection pulley and the axle support component, corresponding to the weight of the elevator car including its maximum permissible payload. The extent of this relative movement should advantageously be limited by the specific configuration of the axle support component to such an extent that, under normal circumstances, no relative movements of, for example, more than 0.5 mm occur. For many applications, it may even be advantageous if the axle support component or its web sections normally permit only relative movements of less than 0.2 mm.

[0036] For the strain gauge sensor, the load measuring device can be attached on one side to an axle retaining section of the axle carrier part, or optionally to the axle itself, or to a fixing arrangement coaxially mounted on the axle, via a force transmission element, and on the opposite side to a mounting section of the axle carrier part. A counter element of the load measuring device can be fixed to the mounting section, with the counter element and force transmission element being connected via a strain gauge. The counter element can include a housing containing the electronics for generating the load-dependent signal. Using a strain gauge sensor enables a very robust design of the load measuring device. Furthermore, the strain gauge allows for very precise and reproducible measurement of the acting forces.

[0037] Further individual features and advantages of the invention will become apparent from the following descriptions of an exemplary embodiment and from the drawings. These show:

[0038] Fig. 1 is a highly simplified representation of an elevator system in a side view, 2022P00107WÖ

[0039] - 9 -

[0040] Fig. 2 shows a side view of a support structure for carrying a cabin body of an elevator car according to the invention, wherein the support structure has a deflection pulley equipped with a load measuring device,

[0041] Fig. 3 shows a perspective view of part of a support structure with a deflection pulley and integrated load measurement according to a second embodiment.

[0042] Fig. 4 shows a perspective exploded view of the support structure from Fig. 3 from a different angle, and

[0043] Fig. 5 shows a perspective view of an axle support part for the load measuring device according to the second embodiment.

[0044] Fig. 1 shows a highly simplified representation of an elevator, designated as 1. The elevator 1 has an elevator car 3 (hereinafter also referred to as "car") that moves vertically up and down in an elevator shaft 2 of a building for transporting persons or goods. A counterweight 13, connected to the car via support elements 6, moves up and down in the opposite direction to the car 3. The car 3 and the counterweight 13 are moved along vertical guides. The car 3 has a car body 4 and a support structure for carrying the car body 4. The car body 4 comprises a car floor, side walls, and a car ceiling.

[0045] The support means 6 for supporting the cabin 3 and the counterweight 13 can be a single rope or several ropes. Of course, other support means, such as belts, are also conceivable. The movable main components of the elevator system, i.e., the cabin 3 and the counterweight 13, which have deflection units, are connected to each other via support means 6. The two deflection units associated with the cabin 3 each have one or more coaxially arranged deflection pulleys 7, 8.

[0046] To move the cabin 3 and the counterweight 13, a drive 15, for example a traction drive, is used to create a so-called machine-roomless elevator. This drive is, for example, installed in the area of ​​the shaft head of the elevator shaft 2. Instead of a machine-roomless elevator system, the drive 15 could be equipped with the traction sheave 14 2022P00107WÖ

[0047] - 10 - of course, they may also be located in a separate engine room in the area of ​​the shaft head.

[0048] The elevator 1 is designed in a 2:1 suspension configuration. The deflection units with the deflection pulleys 7, 8 assigned to the cabin 3 are arranged on a support structure (not shown in the schematic representation of Fig. 1) for carrying the cabin body 4. The deflection pulleys 7, 8 are freely rotatable on axles (not shown here). One of the deflection pulleys, in this example deflection pulley 7 or the corresponding deflection unit, is equipped with an East measuring device.

[0049] Fig. 2 shows a cabin 3 with pulleys, over which the cabin 3 is suspended from the support means 6. As already mentioned, the cabin 3 comprises the cabin body 4 and the support structure 5 for carrying or supporting the cabin body 4. Fig. 2 is limited to the illustration of the pulley 7, which is equipped with the load measuring device. The pulleys 7 and 8 are arranged between two parallel beams of the support structure 5 of the cabin 3, with each pulley 7 and 8 being freely rotatable on an axis.

[0050] Fig. 2 shows one of the two aforementioned supports, which is designated 9. This horizontal support 9 extends from one end, where the deflection pulley 7 is located, to the opposite end, where the other deflection pulley (8, not shown in Fig. 8; see, however, Fig. 1) is located. The support structure 5 has a further support profile 34 above the support 9, which obviously runs transversely to the support 9. The cabin body 4 rests on the upper support 34 as an example.

[0051] The deflection pulley 7 is mounted on the axis 11 using rolling bearings so as to rotate freely. More than one deflection pulley 7 can be mounted on each axis 11 so as to rotate freely. In this case, the deflection pulleys are grouped together to form a deflection unit.

[0052] An axle support part 10 is arranged on the support 9 to carry the axle 11 of the deflection pulley 7, in which the load measuring device 20 is integrated. The plate-like axle support part 10 forms a holding arrangement for the load measuring device 20.

[0053] The plate-like axle carrier part 10 rests against the carrier 9 over its rear side and is mounted on a 2022P00107WÖ

[0054] - 11 -

[0055] The horizontal beam 9 is connected to axis 11 on one side and to support 9 on the other. The horizontal beam 9 has a vertical support wall section 16. This support wall section 16 forms the surface to which the axis support part 10 is attached. The axis support part 10 can lie flat against the support wall section 16. Alternatively, the axis support part 10 can be positioned with a gap, essentially parallel to the support wall section 16. The axis support part 10 thus lies on a plane that is perpendicular to axis 11.

[0056] As can be seen further in Fig. 2, the axle support part 10 is designed as a frame-like plate component extending along a longitudinal axis designated 21. The axle support part 10, also referred to as the support plate, is arranged at an angle of 45° on the support 9. The longitudinal axis 21 forms the aforementioned 45° angle with the horizontal. A double arrow 19 indicates a direction of force during load changes in the cabin, which direction is determined by the longitudinal axis 21 being inclined at 45° to the horizontal. The bores 17 are arranged such that the line passing through the two bores corresponds to the longitudinal axis 21, i.e., to the desired direction of force.

[0057] The support plate 10 has a receiving opening for carrying and fixing the axle 11 to the support plate. A screw 30, embedded in the axle 11, passes through this receiving opening. This receiving opening is designed as a through-hole. This section of the axle support part 10 is also referred to here as the axle retaining section. Web sections 32 and 33 adjoin the axle retaining section 25. Finally, the support plate 10 has a fastening section 27, via which the support plate is fastened to the support 9. The fastening section 27 comprises two fastening openings 17 into which (not shown here) pins, screws, or bolts are inserted, arranged on a line perpendicular to the direction of force. The axle retaining section 25, the web sections 32 and 33, and the fastening section 27 are interconnected sections and are formed by the common component, namely the axle support part or the support plate 10.

[0058] The support plate 10 is designed as a frame-like plate component with a central cutout 31, the two web sections 32, 33 laterally surrounding the cutout 31. Each of the web sections 32, 33 is trapezoidal. In this case, the axle support part 10 comprises two web sections 32, 33 extending along the longitudinal axis 21 and designed symmetrically with respect to the longitudinal direction 21. The axle support part 10 is designed, at least in the area of ​​the web sections, as a kind of double trapezoid, i.e., a polygon, whereby this polygon is only 2022P00107WÖ

[0059] - 12 - consists of the shorter bases and legs of the two trapezoids, with the two longer bases not being implemented or only being virtual. This has the advantage that the polygon can be deformed in a defined direction of force, which in this case corresponds to the direction of the longitudinal axis of the axle support part.

[0060] The support 9 has an open receiving opening 12 at its end for attaching the axle 11 (see especially Fig. 4). The receiving opening 12 extends horizontally and is open at its end. The receiving opening 12 is formed by a horizontal elongated hole into which the axle 11 can be inserted from the outside for mounting the deflection pulley 7, without having to move the two parallel supports 9 of the support structure 5 apart. The axle 11 is attached to the support 9 by means of the axle support section 10, which overlaps the receiving opening 12.

[0061] The axle carrier part 10 is elastically deformed under load, and this deformation can be detected by a suitable sensor. These deformations are so slight that they are practically imperceptible to the naked eye. In the present embodiment, the load measuring device 20 comprises a strain gauge sensor with which deformations of the axle carrier part 10 can be measured. The strain gauge sensor enables a robust design of the load measuring device, and the acting forces can be measured very precisely and reproducibly.

[0062] The axis 11 is received in the receiving opening 12 of the support with clearance, so that in the event of elastic deformation due to load changes the axis 11 does not strike in the area of ​​the receiving opening 12 and allows this slight movement.

[0063] The axle carrier part 10 has a receiving opening, designed as a through-hole, for carrying and fixing the axle 11 to the axle carrier part. A screw 30, embedded in the axle 11, passes through this receiving opening. The axle retaining section 25 associated with this receiving opening is designed as a shoulder that is circular in plan view and raised compared to the other sections 32, 33, 27 of the axle carrier part.

[0064] As already mentioned, the axle carrier part comprises two web sections 32, 33 extending along the longitudinal axis 21. The receiving opening for the axle 11, designated as axle fixing opening 18, which is a receiving opening for carrying the axle and fixing it to 2022P00107WÖ

[0065] - 13 - the axle carrier part is, in the present example, designed as an elongated hole extending in a second direction (here: x-direction), wherein the longitudinal direction and the second direction intersect and enclose an angle of 45°.

[0066] Figures 3 to 5 depict a second embodiment of an elevator with an axle support part 10 attached to one of the supports 9 for carrying the axle 11 of the deflection pulley 7 provided for load measurement, in which the load measuring device 20 is integrated. This embodiment differs from the previously described embodiment, among other things, in that the load measuring device 20 is oriented differently and that, for easier assembly, the mounting opening of the axle support part 10 is designed not as a through hole, but as an open mounting opening.

[0067] The perspective view in Fig. 3 shows part of the support structure 5 of the elevator car 3. As can be seen from this, a deflection pulley unit is arranged between the two supports 9, 9', consisting of two deflection pulleys 7, 7' or a pair of deflection pulleys. The deflection pulleys 7, 7' are each freely rotatable about a common axis by means of a rolling bearing and have an inner ring and an outer ring. The rolling elements, for example formed by balls, are located between the inner ring and the outer ring. The outer ring has, for example, a grooved traction surface adapted to the load-bearing elements. The traction surface could have a smooth cylindrical or a convex surface instead of grooves. The load-bearing elements (not shown here) are, in this case, load-bearing belts that are grooved on one side.

[0068] The axle support section 10 rests flat against the vertical support wall section of the beam 9, designated 16. Alternatively, it can rest against the beam 9 in a substantially plane-parallel position via a ventilation gap. The support plate 10 is arranged at an angle of 45° to the beam 9. This 45° angle is derived from the angle formed by the x-axis and the longitudinal direction 21. The load measuring device 20, also designed here as a strain gauge sensor, extends in the direction designated 40. The two directions 21 and 40 are clearly perpendicular to each other. In other words, the load measuring device 20 is oriented transversely to the axle support section 10. The reference dimension or point for the transverse measurement is the longitudinal direction 21 of the axle carrier part 10. Thanks to the special axle carrier part 10 with the transversely oriented load measuring device 20, precise load measurement can be ensured even in confined spaces. 2022P00107WÖ

[0069] - 14 -

[0070] The exact construction of a deflection pulley 7 equipped with a load measuring device 20 can be seen in Fig. 4. Fig. 4 shows a perspective exploded view with the main components. The axle support part 10, formed by a plate, is arranged on the support 9 to carry the axle 11 of the deflection pulleys 7, 7' provided for load measurement. The load measuring device 20 is integrated into this axle support part 10. A support plate is also attached to the support 9', which runs parallel to the support 9. This support plate, designated 10', is identical to the support plate 10; however, the support plate 10' is not equipped with a load measuring device. The support plate 10' in Fig. 4 thus shows a rear view of the axle support part 10. The respective reference numerals are the same except for the marking by '.

[0071] For clarity, only the two parallel, horizontal beams 9, 9' of the support structure 5 for carrying or bracing the cabin body 4 are shown in Fig. 4. The beams 9, 9' with the vertical support wall section 16 each have open end mounting openings 12 for attaching the axle 11. The end-opening mounting opening 12 in the support wall section 16 extends horizontally. In other words, the mounting opening 12 forms a horizontal elongated hole. This significantly simplifies assembly. For mounting the deflection pulley, the axle can be inserted into the end of the beams 9, 9' from the outside without having to move the two beams 9, 9' apart. For secure mounting, the mounting opening 12 has a nose-like projection 36 at the entrance. On the opposite side to projection 36, the receiving opening 12 is chamfered.

[0072] The axle 11 is attached to the support 9, 9' by means of the support plates 10, 10' which overlap the mounting openings 12. The two bores designated 17 serve for fastening. Pins 41 are inserted into the two fastening openings 17. In addition to the bores or other fastening openings 17, a slightly larger bore is arranged centrally in the axle support part 10, into which a locking screw 42 can be inserted. This locking screw 42 is a further difference from the variant shown in Fig. 2.

[0073] The two deflection pulleys 7, 7' are freely rotatable on the hollow axle 11. A spacer shoulder section (not shown) is located centrally on the hollow axle for... 2022P00107WÖ

[0074] - 15 - spacing is provided between the two deflection pulleys 7, 7'. The axle 11 is secured by means of a clamping screw 30. Washers 38 are provided for the clamping screw 30 and the opposite (not shown) clamping nut. Spacer sleeves 39 are provided on both sides of the hollow axle 11, which ensure that the deflection pulleys 7, 7' are spaced apart from the supports. Further bushing parts 35 are inserted into the hollow axle on both sides of the hollow axle 11. From the outside, bushing-like counterparts 37 engage in the hollow axle 11, thereby securely holding the deflection pulleys in the support structure. The fixation to the axle support part 10 is achieved via its receiving opening, i.e., the axle fixing opening 18.In contrast, the axis 11 is received with play in the receiving opening 12 of the support 9, so that in the event of elastic deformation due to load changes, the axis 11 does not strike the receiving opening and allows this slight movement.

[0075] The axle support part 10 is arranged, dimensioned, and configured such that, under a force transmitted between the deflection pulley 7, or more precisely, the deflection pulley pair 7, 7', and the axle support part 10, which corresponds to the weight of the elevator car including its maximum permissible payload, the axle support part 10 deforms essentially exclusively elastically. In other words, the axle support part 10, formed by a plate, is designed such that it experiences only elastic deformation under forces that typically occur during normal operation of the elevator system. With the load measuring device 20, which in this exemplary embodiment is oriented transversely, such deformations can be detected, and the force acting on the elevator car can be determined from them.

[0076] The load measuring device 20 has a force transmission element associated with the fixed point 29 and a counter element 23. Between the force transmission element (29) and the counter element 23, the load measuring device 20 can have a sensor, for example, in the form of a strain gauge 22 as shown here, by means of which a force acting on the load measuring device 20 between its force transmission element and its counter element 23 can be measured. The load measuring device 20 can, for example, have evaluation electronics in its counter element 23, by means of which the measurement parameters prevailing at the sensor can be converted into electrical signals. The cabin load can be determined from the sensor signal by means of an evaluation unit. The signal representing the load from the load measuring device 20 is sent to an elevator control system, which can then prevent elevator journeys with an impermissibly high load. 2022P00107WÖ

[0077] - 16 -

[0078] Further details of the axle carrier part 10 can be seen in Fig. 5. As can be seen, the axle carrier part 10 is a flat component with plane-parallel top and back surfaces. The axle carrier part 10, formed by a plate, can, for example, be made of steel and manufactured from a sheet of steel using a stamping process. Such a stamped sheet metal part can be easily and inexpensively produced in large quantities.

[0079] Figure 5 again shows the force directions that lead to the deformations of the axle support part 10 during load changes. The main force direction is indicated by the double arrow 19. This main force direction runs in the direction of the longitudinal direction 21 of the axle support part 10, which longitudinal direction 21 is inclined at 45° to the horizontal. However, the axle support part 10, designed as a frame-like plate component with the central cutout 31, is not only deformed in direction 19, but also in the transverse direction 40, which runs perpendicular to it. The axle support part 10 is therefore also deformed in direction 40, which deformation is used for load measurement.

[0080] The axle carrier part 10 is evidently a one-piece component made of a single material, e.g., steel. The axle carrier part 10 has trapezoidal and triangular web sections. The lower web section 32 is trapezoidal, and the other, or upper, web section 33 is triangular. A web extension is formed on the trapezoidal web section 32, in which a bore for defining the fixed point 28 for the strain gauge sensor is arranged. On the opposite side, the second fixed point for the counter element (23) is a bore located centrally in the triangular web section 33.The axle support part, for example made of a sheet of steel, is advantageously dimensioned such that its web sections 32, 33 deform in the direction of force 40 by less than 1 mm, preferably less than 0.5 mm and more preferably only between 0.05 mm and 0.3 mm, when a force is transmitted between deflection pulley and axle support part, which corresponds to the weight of the elevator car including a maximum permissible payload of the elevator car.

Claims

2022P00107WÖ - 17 - Patent claims 1. Elevator with an elevator car (3) that can be moved up and down, wherein the elevator car (3) comprises deflection pulleys (7, 8) over which deflection pulleys (7, 8) the elevator car (3) is suspended in an underslung manner on support means (6), wherein the deflection pulleys (7, 8) are arranged between two beams (9) of a support structure of the elevator car (3) and wherein the deflection pulleys (7, 8) are each mounted so as to be freely rotatable on an axle (11), and wherein one of the deflection pulleys (7) is equipped with a load measuring device (20), characterized in that an axle support part (10) formed by a plate for supporting the axle (11) of the deflection pulley (7) provided for load measurement is arranged on one of the beams (9), in which axle support part (10) the load measuring device (20) is integrated.

2. Elevator according to claim 1, characterized in that the support (9) has at its end a receiving opening (12) for attaching the axle (11), which receiving opening (12) is designed to be open towards its end, and that the axle (11) is attached to the support by means of the axle support part (10) overlapping the receiving opening (12). (9) is attached.

3. Elevator according to claim 1 or 2, characterized in that the axle carrier part (10) is arranged in an inclined position on the support (9).

4. Elevator according to one of claims 1 to 3, characterized in that the axle carrier part (10) has an axle fixing opening (18) into which a screw (30) embedded in the axle (11) or other fastening means is passed.

5. Elevator according to claim 4, characterized in that the axis fixing opening (18) is designed to be open.

6. Elevator according to one of claims 1 to 5, characterized in that the axle support part (10) is designed as a frame-like plate component with a central cutout (31).

7. Elevator according to claim 6, characterized in that the axle support part (10) designed as a frame-like plate component comprises two trapezoidal web sections (32, 33). 2022P00107WÖ - 18 - 8. Elevator according to one of claims 5 to 7, characterized in that the axle support part (10) designed as a frame-like plate component comprises two web sections (32, 33) extending along a longitudinal axis (21) and that the axle fixing opening (18) for the axle (11) is designed as an elongated hole extending in a second direction, wherein the longitudinal axis and the second direction intersect and preferably enclose an angle of 45°.

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