EP2874933B1 - Lift assembly with safety device - Google Patents

Description

The invention relates to an elevator installation and to a method for the relative position monitoring of components in an elevator installation according to the preamble of claims 1 or 14.

In elevator installations, the safety of the operation must be constantly monitored, for example by the monitoring of the closing state of the doors, the monitoring of the driving speed and the protection against overloading belong. Such control and monitoring requires the detection of values, due to which an actual state is continuously compared with a desired state during operation. This is usually done with controls and control devices that allow a time and distance-dependent acquisition of operating data.

In elevator systems with a counterweight, in which a suspension means is guided according to a pulley (for example, 2: 1, 4: 1 or 6: 1 installations), for example, the carrying ropes or straps on the cabin side as well as on the counterweight side are guided by deflection rollers. On these pulleys sometimes act large forces, which is associated with a high material stress. In particular, bearing damage may occur due to wear. Such bearing damage can lead to large forces or torques on the bearing parts due to increased friction. This can e.g. cause a fixed axle body to be turned out of its attachment. This unwanted rotational movement can lead to consequential damage to the suspension up to a total failure of the camp with possibly subsequent damage to the elevator system.

From the EP 0 824 495 B1 It is known to monitor the states of motion and / or rotational adjustment states of mutually rotatable components of a rolling bearing. The monitoring takes place with pulse generators or via other means for signal detection, which are integrated in the rolling bearings. However, such bearings are costly and complex in system integration. In particular, a connection to a control of the elevator installation is required, which can be complicated in the case of rolling bearings arranged on moving components.

From the DE 20 2009 013349 U1 Furthermore, a load lifting devices using the pulley principle has become known, which has a monitoring device for detecting a relative movement between the cable loop and a center roller.

From the WO9943593 are an elevator installation and a method according to the preambles of claims 1, and 14 known.

It is therefore an object of the invention to provide an elevator system with a safety device, which reliably ensures safe operation of the elevator system with a simple construction and cost-effective design. In this case, the invention is intended to ensure monitoring of the operation of a deflection roller assigned to a counterweight of a suspension element of the elevator installation.

The solution of the problem is defined by the features of claim 1. This relates to an elevator installation with a safety device for the relative position monitoring of components in the elevator installation. In this case, the elevator installation comprises a component formed by a counterweight, to which a relatively fixed component formed by a bearing part of a deflection roller assigned to the counterweight is fastened in a predetermined desired position. The safety device is designed and arranged in such a way that a positional deviation of the stationary component (i.e., the bearing part) from the desired position with respect to the component (i.e., the counterweight) can be monitored, whereby an alarm signal can be generated when a predeterminable positional deviation from the safety device is exceeded. The elevator installation is characterized in that the safety device is designed and arranged such that the positional deviation which can be monitored by the safety device comprises a rotation of the stationary component with respect to the counterweight to which it is fastened. In addition, the safety device could also be designed such that a translation of the bearing part or possibly additionally of another component can be monitored.

With a relatively fixed component is presently referred to a component which is rigidly mounted in the operative state with respect to the component to which it is attached. A mobility relative to the component is provided neither during operation nor out of service. It is understood that the fixed component may be releasably secured, for example for maintenance purposes. Such rigidly mounted components may, for example, be screwed tightly to the component, riveted, welded or have a press fit. It is understood that the component to which the component is fixed relatively fixed, can be arranged movably in the elevator system. Alarm signal here refers generally to a signal generated by the safety device, which can be utilized in different ways by other units of the elevator system. For example, the alarm signal can be forwarded to a control of the elevator installation, which blocks operation of the elevator system as a result of the alarm signal, for example in an emergency shutdown or an emergency stop. It is also conceivable that, for example, only or additionally an acoustic or visual alarm is triggered, if the positional deviation of the monitored component does not result in an immediate safety risk. The safety device may include an alarm device, which further processes the alarm signal. In principle, it is also conceivable, for example, to only register the alarm signal and, for example, store it in a memory.

A desired position of the relatively stationary component denotes a position in which it, in the context of a manufacturing or installation tolerance, in operating condition on the component (that is, the counterweight) is fixed. Depending on the nature of the fixed component, positional deviations from this desired position may generally occur in the course of operation, which pose no safety risk and therefore do not have to result in an alarm signal. Due to the predeterminable positional deviation at which the alarm signal is generated, a range of tolerable positions around the desired position is thus definable. Only when the predeterminable positional deviation is reached, the alarm signal is generated according to the invention. It is understood that, for safety reasons, the tolerable range which can be predetermined by the predefinable positional deviations is generally narrow for safety reasons.

By monitoring the position of the relatively fixed bearing part relative to the counterweight, to which the component is attached, an operational arrangement of bearing part can be ensured. A corresponding safety device can be made particularly simple, since in the construction no relative movement has to be considered. Elements of the safety device can therefore be only mechanically negligible or not stressed during normal operation. This is also associated with little or negligible mechanical wear. Likewise, a comparatively low precision in the monitoring of a relatively fixed component is usually required. If such a component has once been released, this usually results in a comparatively significant change in position. The through the security device The monitoring provided by the elevator system according to the invention is therefore fundamentally different from known position monitoring devices, in which components moving relative to one another, for example for determining a position of the car or its speed, can be precisely monitored.

According to the invention, a rotation, i. a rotation of the relatively fixed component relative to the component formed by the counterweight, to which the component formed by the bearing member is attached, and optionally additionally a translation, i. a shift of the component relative to the component monitored. Thus, the safety device is versatile in the elevator system used. In particular, by monitoring rotation of the stationary component, the safety device is also suitable for relatively fixed bearing parts of pivot bearings, such as pivot bearings. Axle body or bearing sleeves suitable. On such bearing parts can act large torques in case of failure of the bearing, which can solve the attachment of the relatively fixed bearing part. Additional monitoring of translation, i. a shift of the component relative to the component, ensures additional security even with rotary bearings. It will be appreciated that monitoring both rotation and translation, or a combination of both, may be beneficial to any type of relatively stationary component. Depending on the type of component, e.g. In the case of only statically loaded components, it may be sufficient to monitor only one translation.

The safety device of the elevator installation according to the invention is suitable for monitoring fixed bearing parts of rotatingly mounted elements. As described above, the fixed component according to the invention is a bearing part of a rotary bearing, in particular an axle body, a deflection roller, which is rotatably mounted on the bearing with respect to the component at this. It is understood that depending on the design of the pivot bearing, other relatively fixed parts of rolling bearings or plain bearings can be monitored such. Bearing sleeves.

Such pulleys can be used in an elevator installation in a variety of applications. Particularly advantageously, the fixed component is a bearing part of a deflection roller for a support means for supporting an elevator car. The support means is connected via the pulley to the elevator car and wraps around the pulley at least partially. As a support means, for example, suspension cables, straps or Straps are used. Such pulleys are used, for example, in 2: 1 installations for the application in which the support means is fixed with both ends to the ceiling (pit head) of the elevator shaft, while cabin and counterweight depending hang by means of pulleys on the support means. Other possible suspensions are for example 4: 1 and 6: 1, which are usually used in goods lifts. Of course, the rotating element, whose bearing part is monitored, for example, be a guide roller or a pivot lever.

Advantageously, the counterweight, on which the stationary bearing part is arranged, movably arranged in the elevator installation. In particular, the component is preferably movable in a straight line along a lift shaft. The component is a counterweight to the elevator car displaceable counterweight, which is connected via the suspension means to the elevator car. Such counterweights are often difficult to access, making maintenance difficult. Especially in this case, a monitoring of the relatively fixed components with the safety device is particularly advantageous. It is understood, however, that the safety device could also be suitable for monitoring fixed components which are fastened to stationary components.

The positional deviation from the desired position which can be monitored by the safety device preferably comprises a deviation component in the direction perpendicular to the direction of movement of the movable component. In particular, this deviation component can result from a rotation with respect to a geometric axis which is arranged perpendicular to the direction of movement or else additionally a translation.

Advantageously, the safety device comprises a detection element for detecting the positional deviation of the fixed bearing part of the counterweight deflection roller from the desired position and a triggering element which can cooperate with the safety device for triggering the alarm signal. Detection element and triggering element are arranged and designed such that they can cooperate at least when reaching the predetermined positional deviation of the fixed bearing part of the target position for triggering the alarm signal.

By having a separate detection element and triggering element, the elements can be arranged on different components of the elevator installation. Especially For example, the detection element may be mounted on the fixed bearing part of the counterweight deflection roller while the trigger element is stationary in the elevator installation or on another component of the elevator installation (eg cabin). Preferably, the detection element and trigger element are arranged contactless to each other when a positional deviation of the fixed bearing part is less than the predetermined position deviation. This is advantageous in the case of movable counterweights, since, with a suitable design and relative arrangement of the detection element and the triggering element, a movement of the counterweight is not hindered.

Detection element and trigger element thus preferably cooperate only when the predeterminable relative positional deviation of the stationary bearing part has been reached. Preferably, the interaction takes place due to a relative change in position of detection element and trigger element.

Advantageously, the trigger element is stationary in the elevator installation, in particular in an elevator shaft. In this way, the trigger element can be equipped with elements of the security device stationarily mounted in the elevator installation, such as e.g. Switching devices or an alarm device interact in a simple manner, if necessary, also be directly connected. Such switching devices may be actuatable via the trigger element and in addition, e.g. provide a fastener for the trigger element. It is understood that, depending on the requirement, a movable arrangement of the trigger element is possible, in which case a connection to the safety device usually can be achieved only with additional effort.

In principle, it is conceivable that triggering element and detection element interact electrically, ie, for example, electrically close a circuit of the safety device upon contact and thus trigger the alarm signal. Preferably, however, the detection element and the trigger element mechanically act upon reaching the predetermined positional deviation of the stationary bearing part of the desired position together such that on the detection element, a force on the trigger element can be generated. Due to the force effect, a switching device can be actuated to trigger the alarm signal, for example, by a change in position of the trigger element reached thereby. The mechanical interaction can take place either directly or indirectly.

Preferably, a tensile force in the trigger element can be generated during the interaction. This is especially true in the case of an elongated configuration of the trigger element, e.g. as a wire or push rod advantageous, wherein the tensile force is preferably generated along the trigger element. In this case, the triggering element may, in the manner of a ripcord, be able to be ripped from a fastening or separated at a predetermined breaking point due to the force effect for actuating a switching device.

Preferably, the trigger element is therefore elongated and preferably extends along the elevator shaft. Such a design is particularly preferred in the case of a component which is movable along the elevator shaft and formed by the counterweight, in which case the trigger element can be arranged parallel to the direction of movement of the counterweight. The trigger element preferably extends substantially over the entire length of the elevator shaft, preferably substantially at least over the range of movement of the counterweight, on which the relatively fixed bearing part is arranged. In this case, the triggering element is preferably made relatively thin, e.g. as a thin rod or wire, so it can be accommodated to save space.

Preferably, a switching device of the safety device is arranged in an end region of the trigger element, which can be actuated via the trigger element. An arrangement of the switching device in an end region of the trigger element has the advantage that the switching device can be arranged stationary at an end-side attachment of the trigger element. The trigger element can be connected directly to the switching device in the end region, e.g. be attached to this. The actuation of the switching device can, as mentioned, e.g. done in the manner of a ripcord or in the case of a rod-shaped training in the manner of a push rod.

The switching device can also be arranged separately from the trigger element of this. In this case, the switching device can be actuated, for example via a driver of the trigger element. The actuation takes place in this case, for example, after a release of the trigger element, for example by mechanical separation due to a longitudinal displacement of the trigger element.

It is understood that the switching device can be arranged in variants in any area of the trigger element. For example, a lateral deflection of the trigger element can be used to actuate the switching device, in which case the switching device can preferably be arranged in the region of the greatest deflection.

Advantageously, the trigger element comprises a wire or a rope. A wire or rope can be easily attached e.g. install stationary in the elevator shaft. In particular, a wire or rope can be formed largely arbitrarily long, which is particularly advantageous for a trigger element, which extends over the entire length of a hoistway.

The wire (hereinafter also representative of ropes) may be formed electrically conductive, for example as a metal wire (or wire rope). In this case, for example, in the event of contact between the detection element and the wire for triggering the alarm signal, a circuit of the safety device can be closed. The circuit can be closed, for example, via a longitudinal guide of the counterweight to the safety device out. Likewise, alternatively, there may be a current flow in the wire which can be interrupted to trigger the alarm signal in the event of mechanical separation of the wire by the detection element.

Preferably, a trip element designed as a wire is also used when the alarm signal is triggered mechanically. In this case, no electrical conductivity is required, which is why, in principle, e.g. Also, a plastic wire or plastic rope can be used. The formation of the trigger element as a wire in this case has the advantage that a mechanical interaction of detection element and trigger element also allows deformation of the trigger element. For example, the wire can be wound up by the detection element due to the positional deviation of the relatively stationary component, whereby a tensile force in the wire can be generated to trigger the alarm signal. In variants, the wire may e.g. also be severed directly from the detection element.

Preferably, the wire or rope is suspended on one side of a fixture in the elevator shaft and braced with a weight. The attachment can eg on a ceiling be arranged in the shaft head of the elevator shaft, wherein the wire or rope from the weight hangs suspended in the elevator shaft. In preferred embodiments, the wire or the cable may also be stretched between two fastenings in the elevator shaft. The fasteners can be arranged on the ceiling and floor of the elevator shaft or on a shaft wall. A tension in the wire can be achieved in this case, for example via a spring device. The fasteners may be provided, for example, by switching devices of the safety device, ie the wire may be attached directly to the switching devices.

In a preferred embodiment, a predetermined breaking point is present in the region of the fastening or at least one of the fastenings of the wire or rope. At the predetermined breaking point as a result of the force generated by the detection element of the wire or the rope depending on the arrangement of the predetermined breaking point at least partially releasable. This embodiment is particularly advantageous in a suspended in the elevator shaft wire, which is covered by a weight. If the additional force exerted by the detection element on the wire, the predetermined breaking point is separable and the wire is releasable. Due to the weight, the wire drops, causing the switching device e.g. via the wire itself or via the weight can be triggered. The predetermined breaking point may be formed on the attachment of the wire or on the wire itself. Instead of the weight, the wire may also be tensioned by a spring arrangement, which e.g. when releasing the wire also triggers the switching device. A predetermined breaking point for releasing the wire can also be advantageous in embodiments in which the wire is stretched between two fasteners.

Advantageously, the detection element of the safety device is mechanically directly, in particular rigidly connected to the relatively fixed bearing part. In this way, a positional deviation of the stationary bearing part results in a direct change in position of the detection element, whereby this can cooperate with the correspondingly arranged release element. It is understood that the detection element also indirectly, e.g. can be connected via a transmission with this fixed component. However, in terms of design and mechanics, this usually requires more effort and may be more prone to malfunction.

Preferably, the detection element has at least one driver for the triggering element on, which is movable at a position deviation from the desired position of the fixed bearing part to the trigger element. The driver may for example be designed as a rod or, for better entrainment of the trigger element, for example, also have a hook-shaped structure. The driver is in the desired position of the relatively fixed component and at a position deviation, which is smaller than the predetermined position deviation, preferably arranged contactlessly to the triggering element. Upon reaching the predetermined position deviation of the driver can take the trigger element and this example in the case of a wire wound or mechanically separating.

Since the fixed component is a bearing part of a pivot bearing, the driver of the detection element is preferably mounted in the direction of the axis of rotation and spaced therefrom directly to the bearing part. With the eccentric arrangement achieved in this way, the driver can be brought to the triggering element due to a rotation of the component.

In a preferred embodiment, the driver, in particular elongated, lateral limiters, between which the trigger element, preferably non-contact, is arranged, at least when the fixed bearing part is in the desired position. Preferably, the arrangement is also contactless, if a positional deviation of the relatively fixed bearing part is smaller than the predetermined positional deviation.

The limiters are preferably arranged relative to each other rigidly and spaced from each other, thus forming a gap for the trigger element. In a rotation about an axis parallel to the limiters they can detect the trigger element and wind example in the case of a wire. By two limiters are present, the interaction of trigger element and detection element can be symmetrical, regardless of the direction of rotation.

Preferably, a gap between the lateral limiters is completed, so that the trigger element is completely enclosed. In this case, the driver may be formed, for example, as an eyelet or opening in the driver. The trigger element is preferably passed through the opening, so that upon rotation of the opening about an axis perpendicular to the opening plane, the border come into contact with the trigger element and can take this optionally. It is understood that other embodiments of fully enclosed openings are conceivable. For example can be mounted on a front side of the fixed component of this spaced apart an end plate via two acting as a lateral limiter bearing neck. The release means may be passed in this case through the so completely bordered space between the end plate and end face of the component. The driver may also include a wire loop surrounding the opening. In variants, the opening can also be formed directly in the stationary component itself, for example as a transverse bore in an axle body.

The invention also relates to a method according to claim 14 for the relative position monitoring of components in an elevator installation with a safety device, in particular in an elevator installation according to the invention. The elevator installation comprises a component which is formed by a movable counterweight and to which a component which is relatively fixed relative to this component in a predetermined desired position is fastened, the mentioned component being a bearing part of a bearing of a deflection roller mounted on the counterweight. The method comprises monitoring a positional deviation of this fixed component from the desired position with respect to the counterweight with the safety device and triggering an alarm via an alarm device of the safety device when a predetermined relative positional deviation of the stationary bearing part with respect to the component is exceeded.

The triggering of the alarm preferably takes place by mechanical interaction of a detection element of the safety device connected to the relatively stationary component with a triggering element of the safety device, in particular a stationary location in the elevator installation. In this case, the mechanical interaction is preferably carried out in such a way that a force action is generated on the trigger element, due to which a switching device of the alarm device is actuated. Alternatively, the method may also include an actuation of the switching device by closing or interrupting a guided through the trigger element circuit. Further method steps result from the present description of the elevator installation.

From the following detailed description and the totality of the claims, further advantageous embodiments and feature combinations of the invention result.

Fig. 1:

eine Ansicht einer erfindungsgemässen Aufzugsanlage mit Sicherheitsvorrichtung;

Fig. 2a:

eine Ansicht eines Gegengewichts mit Umlenkrolle einer erfindungsgemässen Aufzugsanlage;

Fig. 2b:

Ausschnittsvergrösserung einer Stirnseite eines Achskörpers der Umlenkrolle des Gegengewichts der Fig. 2a;

Fig. 3a:

Ansicht gemäss Fig. 2b in einer Draufsicht längs einer Drehachse A mit einem Achskörper in der Solllage;

Fig. 3b:

Ansicht gemäss Fig. 3a mit dem Achskörper in einer von der Solllage abweichenden Lage.

The drawings used to explain the embodiments show schematically:

Fig. 1:

a view of an elevator system according to the invention with safety device;

Fig. 2a:

a view of a counterweight with pulley of an elevator system according to the invention;

Fig. 2b:

Section enlargement of a front side of an axle body of the deflection roller of the counterweight of Fig. 2a ;

Fig. 3a:

View according to Fig. 2b in a plan view along a rotation axis A with an axle body in the desired position;

3b:

View according to Fig. 3a with the axle body in a position deviating from the desired position.

Basically, the same parts are provided with the same reference numerals in the figures.

FIG. 1 shows a schematic view of an elevator system 1 according to the invention with a safety device 2. The elevator installation comprises an elevator car 3, which can be moved in an elevator shaft 4 in the vertical direction. On a wall of the elevator shaft 4, a counterweight 5 is arranged, which is also displaceable in the vertical direction in a longitudinal guide 18. Above the counterweight 5, a support means 6 is firmly anchored to the ceiling 9 of the elevator shaft 4. From the attachment, the support means 6 extends in the vertical direction down to a guide roller 7 of the counterweight 5 and is half led around this. Of the guide roller 7, the support means 6 extends in the vertical direction upwards to a further guide roller 8, which is arranged stationarily in an upper region at the ceiling 9 of the elevator shaft 4. Of the guide roller 8, the support means 6 extends next to the elevator car 3 in the vertical direction down and is guided below the elevator car 3 via pulleys 3.1 from one side of the elevator car 3 to the opposite side. From there, the support means 6 in addition to the elevator car 3 in the vertical direction up to a further anchoring led to the ceiling 9 of the elevator shaft 4. This 2-in-1 (2-in-1) installation creates a simple pulley that can lift a double payload at half the speed of a 1: 1 direct-cab and counterweight installation via a stationary pulley.

Parallel to a displacement of the counterweight 5 is designed as a wire 11 trigger element 26 of the safety device 2 between the ceiling 9 and the bottom 10 of the elevator shaft 4 is stretched. The wire rope 11 is attached to both the ceiling 9 and the bottom 10 to a respective switching device 12 and 13 of the safety device 2. Of course, the wire rope 11 may also be attached to a shaft wall, in which case, if necessary, the switching devices 12 and 13 of the shaft wall can be arranged (not shown). The attachments of the wire rope 11 to the switching devices 12 and 13 may have spring devices, which keep the wire 11 stretched. The switching devices 12 and 13 are designed such that at a sufficient tensile force along the wire rope 11, a switching operation can be triggered. The switching devices 12 and 13 are connected via signal lines 2.1 to a control unit 2.2 of the safety device 2. The control unit 2.2 generates during a switching operation in one or both of the switching devices 12 and 13 an alarm signal. The alarm signal can be forwarded, for example, to a control unit (not shown) of the elevator installation 1. It is understood that the control unit 2.2 of the safety device 2 can be integrated into the control unit of the elevator installation 1.

The wire rope 11 extends in front of an end face of an axle body 15 (see Fig. 2b ) of a bearing of the deflection roller 7. The axle body 15 is relative to the counterweight 5 fixed fixed thereto. The axle body 15 is in a desired position, ie a position in which it is provided fixedly for operation provided. The deflection roller 7 is arranged rotatably about a geometrical axis of rotation A, for example, via a roller bearing or a slide bearing on the stationary axle body 15. The geometric axis of rotation A corresponds essentially to a longitudinal axis of the axle body 15.

The wire rope 11 essentially intersects the axis of rotation A of the deflection roller 7 (see Fig. 2b ). By the wire rope 11 is arranged parallel to the displacement of the counterweight 5 Likewise, a distance of the wire rope 11 from the axle body 15 in the axial direction of A, ie also in a direction perpendicular to the wire rope 11, regardless of a displacement position of the counterweight 5 remains constant , The wire rope 11 can therefore in each shift position of the counterweight 5 by a relatively stationary formed on the counterweight 5 and edged in the direction perpendicular to the wire 11 opening 17 (see Fig. 2b ) pass through without contact.

The opening 17 is bounded in the axial direction of A from an end face 15.1 of the axle body 15 and an end plate 16 spaced therefrom. It is understood that the end face 15.1 of the axle body 15 may be provided by a separate element, which is bolted to the axle body 15 on the front side or from the axle body 15 itself. The front plate 16 is designed as a horizontally arranged strip in the desired position of the axle body 15 and of bearing stubs 24 held at a distance to the front side 15.1 (see Fig. 2b ). The bearing stubs 24 are arranged spaced apart on both sides of the wire rope 11 and form parts of a detection element 25 of the safety device second end 15.1, end plate 16 and bearing stub 24 limit the opening 17, the opening plane is arranged substantially perpendicular to the wire 11. The wire rope 11 passes without contact through the opening 17, when the axle body 15 is in the desired position (see Fig. 2b ).

FIG. 2a schematically shows an oblique view of the counterweight 5 a slightly modified inventive elevator system 1 '. The counterweight 5 is guided on guide shoes (not shown) on both sides in vertical guide rails of the longitudinal guide 18 slidably.

The counterweight 5 has a holding structure 5.1 in the form of holding plates on which the axle body 15 is held relatively stationary with respect to the counterweight 5. The end face 15.1 of the axle body 15 projects beyond in the axial direction, i. in the direction of A, the support structure 5.1 and is about the counterweight 5 on. The arranged in front of the face 15.1 wire rope 11 thus extends completely outside of a range which is covered by the counterweight 5 at a shift.

In the elevator system 1 'of Fig. 2a is the wire rope 11 in contrast to the elevator installation 1 suspended from a mounting 23 on the ceiling 9 of the elevator shaft 4. The attachment 23 comprises a predetermined breaking point 23.1, to which the wire rope 11 is attached. In the region of the bottom 10 of the elevator shaft 4, a weight 22 is suspended freely suspended from the wire rope 11. The wire rope 11 is braced by the attachment 23 in the vertical direction hanging from the weight 22.

The wire rope 11 is attached via a driver 19 on the weight 22. The driver 19 is disposed directly above the weight 22 at this and has a lateral recess 20 with in the direction of the wire rope 11 symmetrically designed control surfaces. The driver 19 is guided in a longitudinal guide 21, so that the driver 19 in this area not laterally, i. perpendicular to the longitudinal direction of the wire rope 11, can escape. On the longitudinal guide 21, a switching device 13 'is arranged, which protrudes with an actuating element in the recess 20. If a sufficiently large displacement of the driver 19 in the direction of the wire rope 11 relative to the longitudinal guide 21, i. relative to the switching device 13 ', the actuating element slides on the control surfaces of the recess 19. The driver 19 actuates the switching device 13 ', whereby a switching operation is triggered. The switching device 13 'is connected via the signal line 2.1 to the control unit 2.2 of the safety device 2, which can generate an alarm signal as a result of the switching operation.

FIG. 2b shows an enlarged detail of an oblique view of the front side 15.1 of the axle body 15. Recognizable is arranged in the direction of A in front of the front side 15.1 end plate 16 with bearing stud 24. Between the bearing sleeve 24 and the front side 15.1 and end plate 16, the wire rope 11 passes through the opening 17th therethrough.

FIG. 3a shows a plan view of the front side 15.1 of the axle body 15 according Fig. 2b along the axis of rotation A in the desired position. The two bearing stubs 24 are arranged with respect to A on both sides of the wire rope 11 and form lateral limiters of the detection element 25. The face plate 16 also forms a limiter in the axial direction of A.

FIG. 3b shows a view according to Fig. 3a , wherein the axle body is rotated about A in a position deviating from the desired position. In this case, a predeterminable positional deviation is exceeded, so that the detection element 25 interacts mechanically with the triggering element 26. This may be the case if, for example, a rolling bearing of the deflection roller 7, for example due to lack of maintenance on the axle body 15 seizes and the axle body 15 is rotated from its attachment. In this case, the bearing neck 24 come into contact with the wire 11 and take this with. The wire rope 11 is wound on the bearing nozzle 24 with a tensile force F along the wire rope 11 is generated.

In the case of the elevator installation 1, this has the consequence that the pulling force triggers a switching operation in the switching devices 12 and / or 13. A corresponding switching signal is transmitted via the signal lines 2.1 to the control unit 2.2, which generates the alarm signal. Optionally, the switching devices 12 and 13 may be formed such that the wire rope 11 is torn to trigger the switching operation in the manner of a rip cord.

In the case of the elevator installation 1 ', the tensile force F has the consequence that the predetermined breaking point 23.1 breaks and the wire rope 11 is thus released. As a result of the release, the wire rope 11 and the weight 22 fall towards the ground 10 and moves the associated driver 19 downwards. The control surfaces of the recess 20 actuate the switching device 13 'and trigger a switching operation. A switching signal is transmitted via the signal line 2.1 to the control unit 2.2, which generates the alarm signal. Alternatively, if e.g. the breaking point 23.1 should fail, if necessary, with sufficient tensile force F, the weight 22 against the force of gravity can be pulled upwards, whereby the driver 19 is moved upward. In a bilateral formation of the recess 19, a switching operation in the switching device 13 'can be triggered in this way also.

From the Fig. 3a and 3b It can be seen that the arrangement of acting as a lateral limiter support piece 24 dictates a positional deviation, in which the bearing stub 24 come into contact with the wire rope 11. At a smaller distance than in Fig. 3a and eg parallel up or down shifted arrangement, the wire rope 11 would be detected by the bearing stub 24 already at a lower positional deviation.

It is immediately apparent that the elevator systems 1 and 1 'shown in the figures are also suitable for embodiments in which a switching operation is triggered electrically. For example, instead of the switching devices 12 and 13 of the elevator installation 1 contacts a circuit of the security device 2 for attachment be provided of the wire rope 11. The tensioned between these contacts wire 11 closes the circuit. In the event of an interruption, for example due to a mechanical separation of the wire rope 11, the safety device can generate the alarm signal. For this purpose, a predetermined breaking point can be provided, for example, on the wire rope 11 itself or on the contacts.

Likewise, it can be seen that the bearing stubs 24 are suitable with appropriate training as electrical contacts for contacting the wire rope 11. If, for example, via the control unit 2.2 to the wire 11 and to the bearing stub 24 (for example, guided over the guide rails 18 and the counterweight 5 to the bearing neck 24) to a voltage potential, at an electrically conductive contact between the bearing neck 24 and wire 11 flow a current. Due to the current flow, an alarm signal can be generated by the safety device 2. In this case, no force is required on the wire rope 11. Further embodiments are directly accessible to the person skilled in the art.

Claims (15)

1. Lift installation (1, 1') with a lift cage (3), a counterweight (5), a support means (6) for supporting the lift cage (3) and the counterweight (5), wherein the counterweight (5) is connected with the support means (6) by way of at least one deflecting roller (7) mounted to be rotatable about a rotary bearing and wherein the support means (6) at least partly loops around the deflecting roller (7), wherein the rotary bearing of the deflecting roller (7) comprises a bearing part (15) stationary relative thereto and, in particular, an axial body, wherein the bearing part (15) is fixed to the counterweight (5) in an intended desired position, characterised in that the lift installation comprises a safety device (2) for relative positional monitoring of the bearing part in the lift installation (1, 1'), wherein the safety device (2) is so constructed and arranged that a positional deviation of the bearing part from the desired position with respect to the counterweight (5) can be monitored, wherein the positional deviation, which can be monitored by the safety device (2), comprises a rotation of the bearing part (15) with respect to the counterweight (5), and wherein an alarm signal can be generated by the safety device (2) if a predeterminable positional deviation is exceeded.
2. Lift installation (1, 1') according to claim 1, characterised in that the positional deviation, which can be monitored by the safety device (2), from the desired position comprises a deviation component in a direction perpendicular to the direction of movement of the movable counterweight (5).
3. Lift installation (1, 1') according to one of claims 1 and 2, characterised in that the safety device (2) comprises a detection element (25) for detecting the positional deviation of the bearing part (15) from the desired position and a trigger element (26) which is co-operable with the safety device (2) for triggering the alarm signal, wherein the detection element (25) and the trigger element (26) are so constructed and arranged that they are co-operable for triggering the alarm signal at least on attainment of the predeterminable positional deviation of the bearing part (15) from the desired position.
4. Lift installation (1, 1') according to claim 3, characterised in that the trigger element (26) is arranged in stationary position in the lift installation (1, 1'), particularly in a lift shaft (4).
5. Lift installation (1, 1') according to one of claims 3 and 4, characterised in that the detection element (25) and the trigger element (26) are mechanically co-operable on attainment of the predeterminable positional deviation of the bearing part (15) from the desired position, wherein a force action on, particularly a tension force along, the trigger element (26) can be generated by way of the detection element (25).
6. Lift installation (1, 1') according to any one of claims 3 to 5, characterised in that the trigger element (26) is of elongate construction and preferably extends longitudinally of the lift shaft (4), particularly substantially over the entire length thereof and parallel to the direction of movement of the counterweight (5) and in particular substantially at least over the length of the range of movement of the counterweight (5).
7. Lift installation (1, 1') according to claim 6, characterised in that a switching device (12, 13, 13'), which is actuable by way of the trigger element (26), of the safety device (2) is arranged in an end region of the trigger element (26).
8. Lift installation (1, 1') according to claim 7, characterised in that the trigger element (26) comprises a wire or a cable (11).
9. Lift installation (1, 1') according to claim 8, characterised in that the wire or the cable (11) is suspended at one end at an attachment (23) in the lift shaft (4) and tensioned by a weight (22) or stretched between two attachments.
10. Lift installation (1, 1') according to claim 9, characterised in that a frangible location (23.1) is present in the region of the attachment (23) or at least one of the attachments of the wire or cable (11).
11. Lift installation (1, 1') according to any one of claims 5 to 12, characterised in that the detection element (25) is mechanically directly, particularly rigidly, connected with the bearing part (15).
12. Lift installation (1, 1') according to any one of claims 3 to 11, characterised in that the detection element (26) comprises at least one entrainer which is movable towards the trigger element when there is a positional deviation from the desired position of the bearing part (15).
13. Lift installation according to claim 12, characterised in that the entrainer comprises lateral, particularly elongate, limiters (24) between which the trigger element (26) is arranged, preferably contactlessly, when the bearing part (15) is in the desired position.
14. Method for relative positional monitoring of components in a lift installation (1, 1') with a safety device (2), particularly in a lift installation (1, 1') according to any one of claims 1 to 13, wherein the lift installation (1, 1') comprises a counterweight (5), which is displaceable in opposite sense to a lift cage (3) and to which a bearing part (15), which is stationary with respect to the counterweight (5) in an intended desired position, of a rotary bearing of a deflecting roller (7) mounted on the counterweight is attached, characterised by the steps:

    - monitoring a relative rotational positional deviation of the bearing part (15) from the desired position with respect to the counterweight (5) by the safety device (2) and

    - generating an alarm signal by the safety device (2) if a predeterminable relative positional deviation is exceeded.
15. Method according to claim 14, characterised in that the generation of the alarm signal is effected by mechanical co-operation of a detection element (25), which is connected with the bearing part (15), of the safety device (2) with a trigger element (26), which is arranged in the lift installation (1, 1') in, in particular, stationary location, of the safety device (2), wherein the mechanical co-operation preferably takes place in such a way that a force action on, particularly a tension force in, the trigger element (26) is produced.

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