EP1700811B1 - Elevator - Google Patents

Description

The invention relates to an elevator system with at least one car movable in a shaft, which is connected via two cable strands, which are assigned to different sides of the car, with a counterweight, and with a motor-driven traction sheave, over which the two cable strands are guided, wherein the Car is kept in a suspension ratio of 1: 1.

Such elevator systems are from the EP-A-1 329 412 known. In this elevator system two in a shaft independently upwards and downwards movable cars are used. The upper car is connected to a traction sheave and a counterweight via a single, multi-strand cable harness. Starting from this counterweight, the rope strand is then guided to a traction sheave of the lower car, and then the rope strand is divided into two rope strands, which run at a distance from each other and each associated with one side of the lower car. The lateral arrangement of the two cable strands of the lower car makes it possible to guide the cable strands each on one side of the upper car, which occupies a position between the two strands of rope. For each of the two cars, a separate drive is used, which is coupled to the respective traction sheave and causes it to rotate.

The use of two spaced apart cable strands to drive a car generally leads to the fact that the two cable strands have a different elongation, since the cable strands are usually performed in different ways with different bending loads. A different expansion behavior of the rope strands is also in a uniform load on the car can not be ruled out, since the cable strands are usually subject to different friction conditions. The different expansion behavior can cause the car held on the two cable strands is wrong. It is therefore known to store the cable strands on spring elements on the car. However, by means of such spring elements, the different elongation behavior of the cable strands can not be fully compensated in all cases, since especially with long strands of rope, the spring elements with their usual spring length are not sufficient for complete compensation.

Particularly in the case of high-speed elevators, in which at least one car is moved by means of two cable strands with speeds of mostly over 4 m / s, the different expansion behavior of the two cable strands is not negligible. To keep driving noises and vibrations of the car and noise of the pulleys and cable strands low even at relatively high speeds in the car, the car is maintained in a suspension ratio of 1: 1, so that the change in height of the car is identical to the feed of the cable strands and consequently there is no relative movement between the cable strands and the car.

Object of the present invention is to develop an elevator system of the type mentioned in such a way that a different elongation behavior of the two cable strands can be compensated.

This object is achieved in an elevator system of the generic type according to the invention that the two cable strands are coupled together via a arranged on the car and / or counterweight rope length compensation device.

By means of the cable length compensation device, a different elongation behavior of the two cable strands can be compensated, in particular larger, resulting in operation of the elevator system length differences of the two cable strands can be compensated despite the suspension ratio of 1: 1 with a cable guide the rope strands on two different ways. The two cable strands are loaded in the elevator installation according to the invention with the same tensile force, so that sets for both cable strands practically the same friction behavior in the range of the traction sheave. In addition, a tilt of the car is avoided.

The rope length compensation device can be positioned on the car or on the counterweight. It can be arranged, for example, above or below the car or the counterweight. In the present case, the car is both a user-accessible car cabin without a car frame and a car cabin including a car frame, on which the car cabin is held.

In a particularly preferred embodiment of the elevator installation according to the invention, the cable length compensation device has two connecting members, via which the two cable strands are operatively connected to the car or the counterweight, wherein the cable strands are coupled together between the two connecting members or via the two connecting members. The cable strands each act on a connecting member which is associated with the respective cable strand. Preferably, the link is disposed adjacent to a plane defined by the side of the car or counterweight to which the respective cable strand is associated.

In many cases, the rope strands comprise several single ropes. It is advantageous if the connecting members comprise a plurality of connecting elements, wherein each individual cable is assigned a connecting element and individual cables of the two cable strands between the respective connecting elements or via the respective connecting elements are coupled together. Such a configuration has the advantage that a rope length compensation and thus a train compensation is made possible between individual ropes of the two cable strands, so that a different elongation behavior of the individual ropes can be compensated.

It is advantageous if a locking device is arranged between the connecting links for non-displaceable mounting of the cable strands relative to the car or to the counterweight. Such a configuration makes it possible to prevent a cable length compensation in the presence of certain operating conditions of the elevator system, for example in the presence of a malfunction. In this case, an immovable mounting of the two cable strands relative to the car or the counterweight can be ensured by means of the locking device. During normal operation of the elevator system, the locking device can be deactivated, so that a rope length compensation is possible during normal operation of the elevator system.

The locking device may for example comprise a cable clamp with which the cable strands can be fixed immovably on the car or on the counterweight.

It is particularly advantageous if the connecting links at least one cable tension compensation element is assigned to compensate for the rope strands prevailing rope tensions. By means of the cable tension compensation elements can be counteracted in addition to the compensation of the rope lengths directly a difference in the rope tensions by the rope tension is increased in the one strand of rope and reduced in the other strand of rope.

If the cable strands have a plurality of individual cables, then it is particularly advantageous if a plurality of cable tension compensation elements are assigned to the connecting elements to compensate for the cable stresses prevailing in the individual cables. This can be ensured in a structurally simple manner that the individual cables of a rope strand have virtually the same cable tension and therefore loaded in the same way and are not overloaded.

The at least one cable tension compensation element can interact in different ways with at least one cable strand and a connecting member. For example, it can be provided that a cable tension compensation element is arranged between a cable strand and a connecting link.

Alternatively or additionally, it can be provided that a cable tension compensation element is arranged between a connecting link and the car or the counterweight.

The cable tension compensation element comprises in a structurally particularly simple embodiment, a spring element.

It can also be provided that the two connecting members are coupled together via a rope length compensation element. The links can hereby be movably held on the car or on the counterweight be, so that by moving at least one link, a difference in the pitches of the two cable strands can be compensated.

It is advantageous if the cable length compensation element has a linear adjustment system, for example a linear drive element, in particular an electrical, mechanical, hydraulic or pneumatic drive element for a linear (linear) movement, for example a hydraulic or pneumatic piston-cylinder unit. The use of a linear adjustment system has the advantage that by means of an electric, mechanical, hydraulic or pneumatic adjusting actively a difference in the cable lengths of the two cable strands can be counteracted by the linear adjustment is activated according to a present pitch difference and thus extended or shortened.

In a particularly preferred embodiment, the connecting members are spaced from each other and the two cable strands are preferably integrally connected to one another between the connecting members. Such a configuration makes it possible to guide the interconnected cable strands around the connecting members and thereby to achieve an immediate tension and length compensation between the cable strands.

In a structurally simple embodiment of the elevator system according to the invention, the connecting members are designed as deflection members, around which a cord is guided around each. It can be provided that the cable strands are slidably supported on the respective deflecting member so that they can move relative to the deflecting member to compensate for an unequal tensile load of the two cable strands.

Preferably, the deflecting members are designed as freely rotatable deflection rollers.

If the two cable strands comprise a plurality of individual cables, then it is advantageous if the deflecting rollers have a plurality of deflecting disks, with each individual cable being guided around a separate deflecting disk. This allows a particularly simple tension and length compensation between the individual cables of the two cable strands.

In order to avoid a mutual influence of the individual ropes in a length compensation, it is advantageous if the deflecting pulleys of a deflection roller are rotatably supported relative to each other. In such an embodiment, the deflection pulleys can rotate independently, so that in a rope length compensation only the affected individual rope is moved, while the other individual ropes of the rope strand experience no relative movement.

It can be provided that the deflecting members are held on a common carrier, which is arranged on the car or on the counterweight.

Alternatively, it may be provided that the deflecting members are each held on a separate carrier, which is arranged on the car or on the counterweight. The carriers can, for example, each form a bearing block, on which a deflection member in the form of a deflection roller is freely rotatably mounted.

Preferably, the deflecting members are held by means of a spring element on the car or on the counterweight. The spring element not only allows the compensation of different cable lengths and cable tensions, but secures also a very low-vibration storage of the car or the counterweight. Alternatively or additionally, it can be provided that the deflecting members are held by means of a linear adjustment system, for example a piston-cylinder unit, on the car or on the counterweight. By activating the linear adjustment system, the deflecting members can be moved relative to the car or to the counterweight.

It is advantageous if the mutual distance of the deflecting members is variable. Thus, for example, be provided that the deflecting members each protrude beyond a side of the car or the counterweight and are held perpendicular to the plane defined by the respective car or counterweight side plane, thereby changing the distance between the deflecting members. Likewise, the compensating movement of the deflecting members can also take place in the vertical direction.

Instead of forming the connecting links in the form of deflecting, is provided in an advantageous embodiment of the invention that the connecting members each form a pivotally mounted lever arm on which a cable strand is held. By pivoting the lever arm a rope length compensation can be achieved in a structurally simple way.

If the cable strands have a plurality of individual cables, then it is advantageous if the lever arms have a plurality of lever arm elements, on each of which a single cable is held. As a result, a different expansion behavior of the individual ropes of a rope strand can be compensated.

Preferably, the two lever arms are rigidly connected to each other and form a rocker. The rocker may for example be mounted on a stand projecting from the car bearing block.

Preferably, the rocker is pivotally held in the region of a vertical center axis of the car or the counterweight. In such an embodiment, the rocker is formed symmetrically such that the two lever arms each have the same length.

It is particularly advantageous if the individual cables of the two cable strands are each coupled to one another via a rocker. The individual cables can each be arranged on a cable tension compensation element at the ends of the rocker. The cable tension compensation elements can be configured, for example, as a one-piece or multi-part spring.

It can be provided that the two cable strands have a different number of individual cables. Such a configuration may be particularly advantageous for high shafts. It is advantageous if a rocker is used, which is held in the direction of the cable strand with the larger number of individual cables offset from the vertical center axis of the car or the counterweight pivotally. The rope strand with the larger number of individual ropes is thus held on a shorter lever arm than the rope strand with the smaller number of individual ropes. Thus, despite a different number of individual ropes in a simple way a rope length compensation and thus a train compensation between the rope strands can be achieved.

Preferably, the pivoting movement of the rocker can be monitored by means of a sensor. For this purpose, in particular a non-contact sensor, for example a magnetic field sensor, preferably a Hall sensor, can be used or else a conventional incremental encoder which is coupled to the pivot axis of the rocker. It can also be the approach of a lever arm of the Rocker be monitored to the car by the distance between the lever arm and the car is detected by a sensor.

In order to recognize a very strong change in length of the two cable strands, it is advantageous if a control signal can be output from the sensor when a predetermined pivoting angle of the rocker or a predetermined distance between the lever arm and the car is exceeded. The control signal may be provided to an elevator controller of the elevator system so that the elevator controller may issue a visual or audible warning signal upon the presence of the control signal to indicate to the user that the two cable strands have a very different cable length, for example due to a longer service life of the cable strands.

In a particularly preferred embodiment of the invention, the two connecting members are each configured as pivotally mounted angle lever with a first side arm and an angle, preferably oriented at right angles to this second side arm, wherein the first side arm a cable strand is held and the second side arms connected to each other via a coupling member are. The first side arms may each protrude beyond a side wall of the car or counterweight and may face in opposite directions, with each of the free ends of the first side arm adjacent to a cable strand. The cable strand can be rigidly connected to the respective side arm. It is particularly advantageous, however, if the cable strand is fixed to the first side arm via a cable tension compensation element, in particular a spring element. The second side arms may be vertically aligned with each other via the coupling member.

The coupling member may comprise a spring element which is clamped between the second side arms.

Alternatively or additionally, it can be provided that the coupling member has a linear adjustment system, so that the second side arms, for example, electrically, mechanically, pneumatically or hydraulically coupled to each other.

If the cable strands have several individual cables, then it is favorable if the angle levers each comprise a plurality of angle lever elements with a first and a second side arm, wherein a single cable is held on a first side arm of an angle lever element, preferably via a cable tension compensation element, and the second side arms of two Angle lever elements are connected to each other via their own coupling members. Different cable lengths of single ropes can thus be counteracted particularly effectively. Preferably, the angle lever elements are held pivotally to each other.

Figur 1:

eine schematische Darstellung einer ersten Ausführungsform einer erfindungsgemäßen Aufzuganlage;

Figur 2:

eine schematische Darstellung einer zweiten Ausführungsform einer erfindungsgemäßen Aufzuganlage;

Figuren 3 bis 9:

ausschnittsweise schematische Darstellungen von dritten bis neunten Ausführungsformen der erfindungsgemäßen Aufzuganlage.

The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it:

FIG. 1:

a schematic representation of a first embodiment of an elevator system according to the invention;

FIG. 2:

a schematic representation of a second embodiment of an elevator system according to the invention;

FIGS. 3 to 9:

partial schematic representations of third to ninth embodiments of the elevator installation according to the invention.

In FIG. 1 an elevator system 10 is shown with a car 12, which is movable in a shaft 13 for the transport of persons and / or loads and a car frame 14 and a car cabin 15 has. The car 12 is connected in a suspension ratio of 1: 1 via two cable strands 17, 18 with a counterweight 20, wherein the cable strands 17, 18 are guided over a common traction sheave 21 which is rotationally driven by means of a drive 22. The cable strands 17 and 18 are each associated with a car side 24 and 25 respectively.

At its top, the car carries a cable length compensation device 30 with two spaced-apart connecting members in the form of two guide rollers 32, 33, around each of a car-side end portion of the cable strands 17 and 18 is guided around. The two guide rollers 32, 33 are each mounted on a support in the form of a rigidly connected to the car 12 bearing block 35 and 36 freely rotatable. Between the two pulleys 32, 33, the two cable strands 17, 18 are integrally connected.

The cable strands 17, 18 are also integrally connected to one another in the region of the counterweight 20 and guided around a counterweight roller 38 which is freely rotatably mounted on the upper side on the counterweight 20.

Occurs, for example, due to a longer service life of very long ropes or a non-symmetrical weight load of the car 12, a different elongation of the two cable strands 17, 18, so may associated length change over the one-piece connection of the two cable strands 17, 18 and their support on the car 12 by means of the guide rollers 32, 33 by displacement of the connecting portion of the cable strands 17, 18 are compared with the car 12.

In FIG. 2 shows a second embodiment of a total occupied by the reference numeral 40 elevator system according to the invention. This is as well as the embodiments described in detail below, in the FIGS. 3 to 9 are designed largely identically designed as the elevator system 10. For identical components are therefore in the FIGS. 2 to 9 the same reference numerals as in FIG. 1 , To avoid repetition, reference is made in this regard to the above explanations.

The in the FIG. 2 Lift system 40 shown differs from the elevator system 10 in that below the car cabin 15, a rope length compensation device 42 is arranged. This includes pulleys 44 and 45, which are each freely rotatably mounted on a common carrier 47, which is held by spring elements 49, 50 on the cab cage 15. A car frame, as at the in FIG. 1 shown elevator system 10 is used, is omitted in the elevator system 40th

Also in the elevator system 40, the cable strands 17, 18 in the region between the guide rollers 44 and 45 integrally connected to each other, wherein they cooperate in this area with a locking device in the form of a cable clamp 52. By means of the cable clamp 52, the two cable strands 17, 18 are held relative to the car cage 15 immovable by being clamped firmly on the carrier 47. Thus, for example, in the case of a malfunction a length compensation between the cable strands 17 and 18 targeted be prevented, which then alternatively the car cabin 15 could be moved with only one strand of rope 17 or 18.

From the elevator system 10, the elevator system 40 also differs in that the two cable strands 17 and 18 are set directly on the counterweight 20. A counterweight roller, as used in the elevator installation 10, is omitted in the elevator installation 40.

In FIG. 3 a third embodiment of an elevator system is shown in fragmentary form, which is occupied overall by the reference numeral 60. In this elevator installation cable strands 61 and 62 are used, each having a plurality of individual cables 63 and 64 respectively. According to the in FIG. 2 In the illustrated embodiment, the cable strands 61 and 62 are guided around deflecting rollers of a cable length compensation device 67 mounted on the underside of the car 12, wherein, however, each individual cable 63 or 64 is assigned a separate deflecting disk 65 or 66 of the deflecting rollers. The individual deflection disks 65 and 66 are held rotatably relative to one another on the carrier 47, so that a length compensation can take place between two individual cables 63 and 64 of the two cable strands 61 and 62, respectively, without the other individual cables 63 and 64 being influenced thereby. It can also be provided that each deflection roller and in particular each deflection pulley 65, 66 is held separately resilient. The resilient mounting of the carrier 47 by means of the spring elements 49, 50 is then not required.

In FIG. 4 is a total occupied by the reference numeral 70 fourth embodiment of an elevator system according to the invention with a rope length compensation unit 74 shown in the underside of the car 12 arranged pulleys 71 and 72 are held on a rope length compensation element in the form of a hydraulic piston-cylinder unit 73, the underside am Car 12 is set. The piston-cylinder assembly 73 forms a linear adjustment system by means of which the deflection rollers 71, 72 can be offset relative to each other in opposite directions in order to change the distance between the deflection rollers 71 and 72. By changing this distance changes in the cable lengths of the cable strands 61, 62 can be specifically compensated. Also in this embodiment, the pulleys 71, 72, as already in FIG. 3 shown, consist of individual, mutually rotatable deflecting wheels, around each of which a single rope of the cable strands 61, 62 is guided around. In each case, a deflection pulley of the deflection roller 71 may be coupled via a piston-cylinder assembly 73 with a deflection pulley of the guide roller 72, so that the cable lengths of the individual cables of the cable strands 61, 62 can be individually compensated.

In FIG. 5 shows a fifth embodiment of a generally designated by the reference numeral 80 inventive elevator system with a rope length compensation device 85, in which two pulleys 81, 82 are used, each free via a cable tension compensation element in the form of a spring element 83 and 84 at the bottom of the car 12 are rotatably mounted. The cable strands 61, 62 are integrally connected to each other in the area between the guide rollers 81 and 82, so that between the cable strands 61, 62 can be made a length compensation during operation of the elevator system 80. The storage of the guide rollers 81 and 82 by means of the spring elements 83 and 84 makes it possible to counteract different cable tensions of the cable strands 61, 62 in a structurally simple manner. Again, the pulleys 81, 82 may have individual, mutually rotatable deflection pulleys, around each of which a single rope of the cable strands 61, 62 is guided around. The individual deflecting disks can each be mounted on the car 12 via a separate spring element 83, 84, so that the cable tensions of the individual cables can be individually compensated.

In the above-described embodiments of the elevator installation according to the invention, the two cable strands are integrally connected to one another. In contrast, in FIG. 6 a sixth embodiment of an elevator system according to the invention shown with reference numeral 90 shown with a rope length compensation device 107, are fixed at the cable strands 91 and 92 at the end via cable tension compensation elements in the form of spring elements 93 and 94 on a lever arm 95 and 96, respectively. The two lever arms 95, 96 are integrally connected to each other and form a rocker 97, which is mounted in the region of a vertical center axis 98 of the car 12 about a horizontally oriented pivot axis 99 pivotally mounted on a carrier 100 which is rigidly connected to the car 12.

The cable strands 91 and 92 each have a plurality of individual cables 101 and 102, respectively, and the lever arms 95 and 96 each comprise lever arm elements 103 and 104, respectively, to which a single cable 101 or 102 is fixed via a spring element 93 and 94, respectively. Two lever arm elements each form a rocker element 105, which is mounted pivotably relative to the remaining rocker elements 105 on the carrier 100.

All rocker elements 105 each cooperate with a rotary encoder 106, by means of which the pivotal position of the rocker element 105 can be detected and which provides a control signal when a maximum permissible and predefinable swivel angle of a known per se and therefore not shown in the drawing, so that the latter If the permissible swivel angle is exceeded, a warning signal can be output.

A seventh embodiment of an elevator installation according to the invention with a rope length compensation device 108 is shown in FIG FIG. 7 shown in detail and occupied by the reference numeral 110. In this elevator installation, two cable strands 111 and 112 are used which have a different number of individual cables 113 and 114, respectively. The individual cables 113 and 114 are fixed via cable tension compensation elements in the form of spring elements 115 and 116 respectively to a lever arm 117 and 118, respectively. The lever arms 117 and 118 each form a connecting member of the cable length compensation device 108 and are pivotally mounted on the carrier 100. The lever arm 117, on which the cable strand 111 is resiliently held with the larger number of individual cables 113, is shorter than the lever arm 118, which resiliently supports the individual cables 114 of the cable strand 112. The two lever arms 117, 118 form a rocker 119, in contrast to the in FIG. 6 illustrated embodiment offset from the vertical center axis 98 on the carrier 100 is pivotally mounted. Thus, by means of the rocker 119 in spite of the use of cable strands 111, 112 with a different number of individual ropes 113 and 114 in a structurally simple manner an equally high load and a length compensation of the cable strands 111, 112 can be achieved. Via the spring elements 115 and 116, compensation of the cable tensions prevailing in the individual cables 113, 114 is additionally possible.

In FIG. 8 is an overall denoted by the reference numeral 130 eighth embodiment of an elevator system according to the invention is shown in which a rope length compensation device 131 is used, the two spaced apart connecting members in the form of two angle levers 133, 134 each having a first side arm 135 and 136 and a The angle levers 133, 134 are pivotable about horizontal pivot axes 139 and 140, respectively, on carriers 141 and 142 fixed to the underside of the car 12, respectively held. At the free ends of the first side arms 135, 136, a respective cable strand 143 and 144 is fixed, and the second side arms 137, 138 are connected to each other via a coupling member in the form of a tension spring 145. By pivoting the angle lever 133, 134, a different elongation behavior of the two cable strands 143, 144 can be compensated, by means of the tension spring 145 and the rope tension of the two cable strands 143, 144 are compensated.

In FIG. 9 a ninth embodiment of an elevator installation according to the invention with a cable length compensation device 164 is shown in which, corresponding to the elevator installation 130, two angle levers 151 and 152 are used, each with a first side arm 153 or 154 and a second side arm 155 or 156 Once again, a cable strand 157 or 158 is fixed to the first side arms 153, 154. In contrast to the elevator system 130, however, the second side arms 155, 156 are not coupled to one another via a tension spring but via a linear adjustment system in the form of a hydraulic piston-cylinder unit 159. In addition, the two angle levers 151, 152 are mounted on a common carrier 160, which is formed substantially U-shaped and two fixed to the car 12 support arms 161, 162, which are integrally connected via a support web 163. The piston-cylinder unit 159 is held between the two support arms 161, 162 and is thus covered on the top side by the car 12 and on the underside by the support web 163. It forms a rope length compensation element to compensate for different cable lengths of the cable strands 157, 158th

Also in the cable length compensation devices 131 and 164, the cable strands 143, 144 and 157, 158 may comprise a plurality of individual cables, each of which is assigned a separate angle lever 133, 134 and 151, 152, respectively an angle lever 133 or 151 is coupled via a separate coupling member 145 or 159 with an associated angle lever 134 or 152. Thus, also in the in the FIGS. 8 and 9 illustrated embodiments, the cable lengths of individual cables of the cable strands 143, 144 and 157, 158 are compensated regardless of the pitch of the remaining individual ropes. Especially at the in FIG. 9 shown rope length compensation device 164 may also be provided that the individual cables of the cable strands 157, 158 each have a spring element, as for example in FIG. 6 shown and occupied by the reference numerals 93, 94, are held at the respective angle lever 151 and 152, respectively. The spring elements allow a balance of the rope tensions of the individual ropes.

Claims (37)

1. Elevator installation with at least one car (12), which can be made to travel in a shaft (13) and is connected to a counterweight (20) by means of two cable strands (17, 18; 61, 62; 91, 92; 111, 112; 143, 144; 157, 158), which are associated with different sides (24, 25) of the car (12), and with a traction sheave (21), which can be driven by a motor and over which the two cable strands (17, 18; 61, 62; 91, 92; 111, 112; 143, 144; 157, 158) are led, the car (12) being kept in a suspension ratio of 1:1, characterized in that the two cable strands (17, 18; 61, 62; 91, 92; 111, 112; 143, 144; 157, 158) are coupled to each other by means of a cable length equalizing device (30; 42; 67; 74; 85; 107; 108; 131; 164) disposed on the car (12) and/or on the counterweight (20).
2. Elevator installation according to Claim 1, characterized in that the cable length equalizing device (30; 42; 67; 74; 85; 107; 108; 131; 164) is disposed above or below the car (12) or the counterweight (20).
3. Elevator installation according to Claim 1 or 2, characterized in that the cable length equalizing device (30; 42; 67; 74; 85; 107; 108; 131; 164) has two connecting links (32, 33; 44, 45; 71, 72; 81, 82; 95, 96; 117, 118; 133, 134; 151, 152), by means of which the two cable strands (17, 18; 61, 62; 91, 92; 111, 112; 143, 144; 157, 158) are operatively connected to the car (12) or the counterweight (20), the cable strands (17, 18; 61, 62; 91, 92; 111, 112; 143, 144; 157, 158) being coupled to each other between the two connecting links (32, 33; 44, 45; 71, 72; 81, 82) or by means of the two connecting links (95, 96; 117, 118; 133, 134; 151, 152).
4. Elevator installation according to Claim 3, characterized in that the cable strands (61, 62; 91, 92; 111, 112) have a number of individual cables (63, 64; 101, 102; 113, 114) and the connecting links (44, 45; 95, 96) comprise a number of connecting elements (65, 66; 103, 104), each individual cable (63, 64; 101, 102) being associated with a connecting element (65, 66; 103, 104) and individual cables (63, 64; 101, 102) of the two cable strands (61, 62; 91, 92) being coupled to each other between the respective connecting elements (65, 66) or by means of the respective connecting elements (103, 104).
5. Elevator installation according to Claim 3 or 4, characterized in that an arresting device (52) is disposed between the connecting links (44, 45) for the non-displaceable securement of the cable strands (17, 18) in relation to the car (12) or the counterweight (20).
6. Elevator installation according to Claim 5, characterized in that the arresting device comprises a cable clamp (52).
7. Elevator installation according to one of Claims 3 to 6, characterized in that at least one cable tension equalizing element (49, 50; 83, 84; 93, 94; 115, 116) is associated with the connecting links (44, 45; 71, 72; 81, 82; 95, 96; 117, 118; 133, 134; 151, 152) for equalizing the cable tensions prevailing in the cable strands (17; 18; 61; 62; 91, 92; 111, 112).
8. Elevator installation according to Claim 7, characterized in that the cable strands (91, 92; 111, 112) have a number of individual cables (101, 102; 113, 114) and the connecting links (95, 96; 117, 118) have a number of associated cable tension equalizing elements (93, 94; 115, 116) for equalizing the cable tensions prevailing in the individual cables (101, 102; 113, 114).
9. Elevator installation according to Claim 7 or 8, characterized in that at least one cable tension equalizing element (93, 94; 115, 116) is disposed between a cable strand (91, 92; 111, 112) and a connecting link (95, 96; 117, 118).
10. Elevator installation according to Claim 7, 8 or 9, characterized in that at least one cable tension equalizing element (49, 50; 83, 84) is disposed between a connecting link (44, 45; 71, 72; 81, 82) and the car (12) or the counterweight (20).
11. Elevator installation according to one of Claims 7 to 10, characterized in that the cable tension equalizing element comprises a spring element (49, 50; 83, 84; 93, 94; 115, 116).
12. Elevator installation according to one of Claims 3 to 11, characterized in that the two connecting links (71; 72; 133, 134; 151, 152) are coupled to each other by means of a cable length equalizing element (73; 145; 159).
13. Elevator installation according to Claim 12, characterized in that the cable length equalizing element comprises a linear adjusting system (73; 145; 159).
14. Elevator installation according to one of Claims 3 to 13, characterized in that the connecting links (32, 33; 44, 45; 71, 72; 81, 82) are disposed at a distance from each other and the two cable strands (17, 18; 61, 62) are connected to each other between the connecting links (32, 33; 44, 45; 71, 72; 81, 82).
15. Elevator installation according to one of Claims 3 to 14, characterized in that the connecting links are configured as deflecting elements (32, 33; 44, 45; 71, 72; 81, 82), which are disposed at a distance from each other and around which a cable strand (17, 18; 61, 62) is respectively led.
16. Elevator installation according to Claim 15, characterized in that the deflecting elements are configured as freely rotatable deflecting rollers (32, 33; 44, 45; 71, 72; 81, 82).
17. Elevator installation according to Claim 16, characterized in that the two cable strands (61, 62) have a number of individual cables (63, 64) and the deflecting rollers (44, 45) comprise a number of deflecting sheaves (65, 66), each individual cable (63, 64) being led around a separate deflecting sheave (65, 66).
18. Elevator installation according to Claim 17, characterized in that the deflecting sheaves (65, 66) of a deflecting roller (44, 45) are held rotatably in relation to each other.
19. Elevator installation according to one of Claims 15 to 18, characterized in that the deflecting elements (44, 45; 71, 72) are held on a common carrier (47; 73), which is disposed on the car (12) or on the counterweight (20).
20. Elevator installation according to one of Claims 15 to 18, characterized in that the deflecting elements (32, 33; 81, 82) are respectively held on a separate carrier (35, 36; 83, 84), which is disposed on the car (12) or on the counterweight (20).
21. Elevator installation according to one of Claims 15 to 20, characterized in that the deflecting elements (44, 45; 81, 82) are held on the car (12) or on the counterweight (20) by means of a spring element (49, 50; 83, 84).
22. Elevator installation according to one of Claims 15 to 21, characterized in that the deflecting elements (71, 72) are held on the car (12) or on the counterweight (20) by means of a linear adjusting system (73).
23. Elevator installation according to one of Claims 15 to 22, characterized in that the distance between the deflecting elements (71, 72) can be changed.
24. Elevator installation according to Claim 23, characterized in that the distance between the deflecting elements (71, 72) can be changed by means of a linear adjusting system (73).
25. Elevator installation according to one of Claims 3 to 13, characterized in that the connecting elements respectively form a pivotably mounted lever arm (95, 96; 117, 118), on which a cable strand (91, 92; 111, 112) is held.
26. Elevator installation according to Claim 25, characterized in that the lever arms (95, 96) have a number of lever arm elements (103, 104), on each of which an individual cable (101, 102) of the cable strand (91, 92) is held.
27. Elevator installation according to Claim 26, characterized in that the lever arm elements (103, 104) of each lever arm (95, 96) are pivotably held in relation to each other.
28. Elevator installation according to Claim 25, 26 or 27, characterized in that the lever arms (95, 96; 117, 118) are rigidly connected to each other and form a rocker (97; 119).
29. Elevator installation according to Claim 28, characterized in that the rocker (97) is pivotably held in the region of a vertical centre axis (98) of the car (12) or of the counterweight (20).
30. Elevator installation according to Claim 28, characterized in that the two cable strands (111, 112) have a different number of individual cables (113, 114) and the rocker (119) is pivotably held offset in the direction of the cable strand (111) with the greater number of individual cables (113) in relation to the vertical centre axis (98) of the car (12) or of the counterweight (20).
31. Elevator installation according to Claim 28, 29 or 30, characterized in that the pivoting movement of the rocker (97) can be monitored by means of a sensor (106).
32. Elevator installation according to Claim 31, characterized in that a control signal can be output by the sensor (106) when a predetermined pivoting angle of the rocker (97) is exceeded.
33. Elevator installation according to one of Claims 3 to 13, characterized in that the two connecting links are configured as pivotably mounted angle levers (133, 134; 151, 152), with a first side arm (135, 136; 153, 154) and a second side arm (137, 138; 155, 156) aligned at an angle to said first side arm, a cable strand (143, 144; 157, 158) being held on the first side arm (135, 136; 153, 154) and the second side arms (137, 138; 155, 156) being connected to each other by means of a coupling link (145; 159).
34. Elevator installation according to Claim 33, characterized in that the coupling link comprises a spring element (145).
35. Elevator installation according to Claim 33 or 34, characterized in that the coupling link comprises a linear adjusting system (159).
36. Elevator installation according to Claim 33, 34 or 35, characterized in that the cable strands (143, 144; 157, 158) comprise a number of individual cables and the angle levers (133, 134; 151, 152) have a number of angle lever elements with a first and a second side arm, an individual cable being respectively held on a first side arm of an angle lever element and the second side arms of two angle lever elements being connected to each other by means of a coupling link.
37. Elevator installation according to Claim 36, characterized in that the angle lever elements are pivotably held in relation to each other.

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