AU2021443323A1 - Elevator - Google Patents

Abstract

The invention relates to an elevator for transporting passengers and/or goods. The elevator according to the present invention comprises an elevator car (1); a counterweight (2); and one or more ropes (3), (4) interconnecting the car (1) and counterweight (2), one end of each rope (3), (4) being fixed to the elevator car (1) and the other end of each rope (3), (4) being fixed to the counterweight (2), and each rope (3), (4) comprising one or more conductive load bearing members (31-34), (41), (42) that extend unbroken throughout the length of the rope (3), (4), wherein the supply of electricity between said elevator car (1) and said counterweight (2) and/or the data transfer between said elevator car (1) and said counterweight (2) is realized via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4).

Description

ELEVATOR

FIELD OF THE INVENTION

[0001] The invention relates to an elevator for transporting passengers and/or goods. BACKGROUND OF THE INVENTION

[0002] An elevator typically comprises an elevator car and a counterweight, which are vertically movable in a hoistway. These elevator units are typically interconnected by suspension roping, i.e. suspension ropes that suspend these elevator units on opposite sides of one or more rope wheels mounted higher than these elevator units. Suspension ropes may also be called hoisting ropes. For providing force for moving the suspension ropes, and thereby also for the elevator car and a counterweight, one of the wheels is typically a drive wheel engaging the suspension ropes. At least one of these rope wheels is a drive wheel, so that the suspension ropes are normally arranged to suspend the elevator units on opposite sides of a drive wheel. For providing force for moving the suspension roping, and thereby also for the elevator units, the elevator usually comprises a drive machine which drives the elevator car under control of an elevator control system. The drive machine typically comprises a motor and a rotatable drive member, such as a drive wheel, engaging an elevator roping which is connected to the car. Thus, the driving force is transmitted from the motor to the car via the drive member and the suspension roping. The motor is automatically controlled by an elevator control system, whereby the elevator is suitable for automatically serving passengers.

[0003] Conventionally, elevators have a counterweight suspended by a suspension rope section that is on one side of the rotatable drive member and the car by the suspension rope section that is on the other side of the rotatable drive member. The counterweight provides tension for the suspension rope section which does not suspend the car. [0004] The elevator car may also have a travelling cable connected by ropes, which hang from the elevator car and connected to the hoistway. The travelling cable is often used to provide compensation for the weight of the suspension ropes.

[0005] Ropes of an elevator, such as suspension ropes or hoisting ropes, typically include one or several load bearing members that are elongated in the longitudinal direction of the rope, each load bearing member forming a structure that continues unbroken throughout the length of the rope. Load bearing members are the members of the rope, which are able to bear together the load exerted on the rope in its longitudinal direction. The load, such as a weight suspended by the rope, causes tension on the load bearing member in the longitudinal direction of the rope, which tension can be transmitted by the load bearing member in question all the way from one end of the rope to the other end of the rope. Ropes may further comprise non-bearing components, such as an elastic coating, which cannot transmit tension in the above-described way. [0006] As a safety measure for elevators, a conventional OSG with steel rope is not favorable with high travel height (OSG, overspeed governor]. This is because the large inertia of a long OSG rope may cause unintentional activation of safety gear e.g. during an emergency stop. When the elevator is stopped rapidly, the inertia force of OSG rope may be high enough to activate the safety gear. [0007] In elevators, an electrical overspeed governor OSG is preferred, especially with high travel height. The electrical OSG does not have a moving rope, but overspeed detection is done electrically e.g. with linear encoder. With the electrical OSG, the tripping speed can be a function of elevator car position or counterweight position. In elevators, the counterweight does not have supply of electricity, so electrical overspeed governor or electrical safety gear is not possible to implement.

BRIEF DESCRIPTION OF THE INVENTION

[0008] The object of the invention is to introduce a new type of an elevator, in which a continuous, reliable and immediate power supply is provided to the counterweight. Advantageous embodiments are furthermore presented, inter alia, wherein said counterweight is provided with more sophisticated features when compared with the prior art solutions.

[0009] It is brought forward a new elevator comprising an elevator car; a counterweight; and one or more ropes interconnecting the car and counterweight, one end of each rope being fixed to the elevator car and the other end of each rope being fixed to the counterweight, and each rope comprising one or more conductive load bearing members that extend unbroken throughout the length of the rope, wherein the supply of electricity between said elevator car and said counterweight and/or the data transfer between said elevator car and said counterweight is realized via said conductive load bearing members of said one or more ropes.

[0010] Hereby, one or more of the above-mentioned advantages and/or objectives are achieved. These advantages and/or objectives are further facilitated with the additional preferred features described in the following.

[0011] In a preferred embodiment, said one or more ropes comprise one or more hoisting belts, one or more hoisting ropes or one or more hoisting cables.

[0012] In a preferred embodiment, said counterweight comprises a safety gear arrangement. [0013] In a preferred embodiment, said counterweight comprises a counterweight battery, said counterweight battery arranged to receive supply of electricity from said elevator car via said conductive load bearing members of said one or more ropes, and said counterweight battery arranged to supply electricity to said safety gear arrangement. [0014] In a preferred embodiment, said elevator car is arranged to receive supply of electricity from said counterweight battery via said conductive load bearing members of said one or more ropes. [0015] In a preferred embodiment, said counterweight comprises a counterweight control unit, said counterweight control unit arranged to receive supply of electricity from and/or transfer data with said elevator car via said conductive load bearing members of said one or more ropes, and said counterweight control unit arranged to transfer electricity and/or data to said safety gear arrangement.

[0016] In a preferred embodiment, said safety gear arrangement comprises activating means energized by electricity from said counterweight control unit.

[0017] In a preferred embodiment, said one or more ropes comprises a non- conductive coating, said one or more conductive load bearing members being embedded in said coating, said coating forming the surface of said one or more ropes, and extending between adjacent load bearing members thereby isolating them from each other.

[0018] In a preferred embodiment, said conductive load bearing members are made of non-metal material, e.g. of composite material comprising electrically conducting reinforcing fibers in polymer matrix, said reinforcing fibers preferably being carbon fibers.

[0019] In a preferred embodiment, said one or more ropes comprise one or more optic fibers in said ropes. [0020] In a preferred embodiment, said one or more ropes comprise a plurality of first conductive load bearing members; a non-conductive coating, said non- conductive coating covering said plurality of first conductive load bearing members; and a plurality of second conductive load bearing members wound around said coated first conductive load bearing members and said non-conductive coating.

[0021] In a preferred embodiment, said one or more ropes comprise one or more optic fibers in said ropes. [0022] In a preferred embodiment, said elevator comprises an elevator control system; a travelling cable, which travelling cable hangs from the elevator car, and comprises two or more conductive members that extend unbroken throughout the length of said travelling cable, and which travelling cable is connected to a hoistway connection at the hoistway; wherein the supply of electricity to said elevator car and/or the data transfer between said elevator control system and said elevator car is realized via said plurality of conductive members of said travelling cable.

[0023] In a preferred embodiment, said elevator car comprises a battery.

[0024] In a preferred embodiment, said elevator car comprises a battery- charging unit arranged for charging said battery of the elevator car.

[0025] In a preferred embodiment, said elevator comprises an elevator control system; a travelling cable, which travelling cable hangs from the counterweight, and comprises two or more conductive members that extend unbroken throughout the length of said travelling cable, and which travelling cable is connected to a hoistway connection at the hoistway; wherein the supply of electricity to said counterweight and/or the data transfer between said elevator control system and said counterweight is realized via said plurality of conductive members of said travelling cable.

[0026] In a preferred embodiment, said counterweight comprises a battery. [0027] In a preferred embodiment, said elevator car comprises a battery charging unit arranged for charging said battery of the counterweight.

[0028] In a preferred embodiment, said battery of the elevator car and/or said battery of the counterweight is/are arranged for being charged wirelessly.

[0029] In a preferred embodiment, said elevator car or said counterweight comprises a communication unit arranged for wirelessly transferring data between said elevator control system and the elevator car or the counterweight. [0030] In a preferred embodiment, said communication unit is arranged for transferring data between said elevator car and said counterweight via said conductive load bearing members of said one or more ropes.

[0031] In a preferred embodiment, said counterweight comprises an at least one speed sensor arranged to measure the speed of said counterweight.

[0032] In a preferred embodiment, said counterweight comprises an at least one position sensor arranged to measure the vertical position of said counterweight.

[0033] In a preferred embodiment, said counterweight said counterweight comprises an at least one acceleration sensor arranged to measure the acceleration of said counterweight.

[0034] In a preferred embodiment, the activating means of the safety gear arrangement of said counterweight are activated in response to an output from said at least one speed sensor and/or said at least one position sensor and/or said at least one acceleration sensor.

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In the following, the present invention will be described in more detail by way of example and with reference to the attached drawings, in which:

Figure 1 illustrates a functional view of an elevator according to one embodiment of the present invention.

Figure 2 illustrates a hoisting rope of an elevator according to one embodiment of the present invention.

Figure 3 illustrates a cross-sectional view of one embodiment of a hoisting rope of an elevator according to the present invention. Figure 4 illustrates a preferred inner structure of one embodiment of the load bearing member according to the present invention.

Figure 5 illustrates a three-dimensional view of a section of one embodiment of the load bearing member according to the present invention. Figure 6 illustrates a stepwise cross-sectional view of another embodiment of a hoisting rope of an elevator according to the present invention.

Figure 7 illustrates preferred details of a counterweight arrangement according to one embodiment of the present invention. Figure 8 illustrates a functional view of an elevator according to another embodiment of the present invention.

Figure 9 illustrates a functional view of an elevator according to a third embodiment of the present invention.

Figure 10 illustrates a functional view of an elevator according to a fourth embodiment of the present invention.

The foregoing aspects, features and advantages of the invention will be apparent from the drawings and the detailed description related thereto.

DETAILED DESCRIPTION

[0036] Figure 1 illustrates a functional view of an elevator according to one embodiment of the present invention. In the presented embodiment, the elevator comprises a hoistway and an elevator car 1 vertically movable in the hoistway and a counterweight 2 vertically movable in the hoistway. Said elevator car 1 is arranged for receiving a load to be transported i.e. goods and/or passengers. In the presented embodiment, the elevator also comprises one or more hoisting ropes 3, 4 interconnecting the elevator car 1 and the counterweight 2, one end of each hoisting rope 3, 4 being fixed to the elevator car 1 and the other end of each hoisting rope 3, 4 being fixed to the counterweight 2, and each hoisting rope 3, 4 comprising one or more conductive load bearing members that extend unbroken throughout the length of the hoisting rope 3, 4. [0037] As used herein the term “hoisting rope” refers to any hoisting means arranged to interconnect the elevator car and the counterweight, said hoisting means including hoisting ropes, hoisting cables and hoisting belts, e.g. hoisting belts comprising a plurality of conductive load bearing members and a non- conductive coating. [0038] In the presented embodiment, the elevator also comprises a drive machine, which drives the elevator car 1 under control of an elevator control system. Said drive machine comprises a motor and a rotatable drive member 6, a drive wheel 6, said drive wheel 6 engaging said one or more hoisting ropes 3, 4 connected to the elevator car 1 and to the counterweight 2. In the presented embodiment, said one or more hoisting ropes 3, 4 comprises a plurality of conductive load bearing members. The elevator according to the presented embodiment also comprises a travelling cable 7, which hangs from the elevator car 1 and is connected to a hoistway connection 8 at the hoistway. In the present embodiment, said travelling cable 7 comprises two or more conductive members that extend unbroken throughout the length of said travelling cable 7. Alternatively, said travelling cable 7 may also be realized as two or more cables 7, each cable 7 comprising one or more conductive members that extend unbroken throughout the length of said cable 7. [0039] In the presented embodiment, the elevator car 1 of the elevator comprises a car control unit 12, which car control unit 12 controls certain functions of the elevator car 1 and is connected to said elevator control system. Furthermore, in the presented embodiment, the counterweight 2 of the elevator comprises a counterweight control unit 22, which counterweight control unit 22 controls certain functions of the counterweight 2 and is connected to said elevator control system. In the presented embodiment, the counterweight 2 of the elevator also comprises a battery 21 and a safety gear arrangement 23.

[0040] In the present embodiment, the supply of electricity from the elevator car 1 to the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, in the present embodiment, the supply of electricity also to the battery 21 of the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, in the present embodiment, said battery 21 of the counterweight 2 may be also used for supplying electricity to the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4.

[0041] Furthermore, in the present embodiment, data transfer between the elevator car 1 and the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Said one or more hoisting ropes 3, 4 may also comprise one or more optic fibers in said hoisting ropes 3, 4 for transferring data.

[0042] In the presented embodiment, said counterweight control unit 22 is arranged to receive electricity from and/or transfer data with the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2. Likewise, said safety gear arrangement 23 is arranged to receive electricity and/or data from the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2, possibly via said counterweight control unit 22. Said safety gear arrangement 23 may also comprise activating means, which activating means may be arranged to be energized by electricity from said counterweight control unit 22.

[0043] In the presented embodiment, the supply of electricity to the elevator car 1 is realized via said hoistway connection 8 at the hoistway and via said plurality of conductive members of said travelling cable 7. Likewise, in the presented embodiment, data transfer between the elevator control system and the elevator car 1 is realized via said hoistway connection 8 at the hoistway and via said plurality of conductive members of said travelling cable 7.

[0044] Electricity supply and data transfer can happen via the same or different suspension and/or compensation ropes. The ropes should have electrically insulating coating and at least one electrically conductive core. Ropes may also contain one or more optic fibers. Redundancy can be increased by using several parallel ropes for power or data transfer. [0045] In the presented embodiment, the counterweight 2 of the elevator may comprise an at least one speed sensor arranged to measure the speed of said counterweight 2. Furthermore, the counterweight 2 of the elevator may comprise an at least one position sensor arranged to measure the vertical position of said counterweight 2. Furthermore, the counterweight 2 of the elevator may comprise an at least one acceleration sensor arranged to measure the acceleration of said counterweight 2. In the presented embodiment, said activating means of the safety gear arrangement 23 of said counterweight 2 may be activated in response to an output from said at least one speed sensor and/or said at least one position sensor and/or said at least one acceleration sensor.

[0046] Figure 2 illustrates a hoisting rope of an elevator according to one embodiment of the present invention. In the presented embodiment, the hoisting rope 3 may also be referred to as a hoisting belt 3 as said hoisting rope 3 is belt shaped, i.e. larger in width direction than thickness direction. The hoisting rope 3 comprises a non-conductive coating 35, and a plurality of conductive load bearing members 31-34 for bearing the load exerted on the hoisting rope 3 in longitudinal direction thereof, which are adjacent in width direction of the hoisting rope 3. The load bearing members 31-34 are embedded in the non-conductive coating 35 and extend parallel to each other as well as to the longitudinal direction of the hoisting rope 3 unbroken throughout the length of the hoisting rope 3. The coating 35 forms the surface of the hoisting rope 3 and extends between adjacent load bearing members 31-34, thereby isolating them from each other both mechanically and electrically. The said conductive load bearing members 31-34 maybe made of non- metal material. The said conductive load bearing members 31-34 may be made of composite material comprising electrically conducting reinforcing fibers in polymer matrix, said reinforcing fibers preferably being carbon fibers.

[0047] Figure 3 illustrates a cross cross-sectional view of one embodiment of a hoisting rope of an elevator according to the present invention. In the presented embodiment, the hoisting rope 3 may also be referred to as a hoisting belt 3 as said hoisting rope 3 is belt-shaped, i.e. larger in width direction than thickness direction. The hoisting rope 3 comprises one or more elongated load bearing members 31-34 that extend parallel to the longitudinal direction 1 of the hoisting rope 3 unbroken throughout the length of the hoisting rope 3. As illustrated, the load bearing members 31-34 are embedded in a non-conductive surface material 35 forming the outer surface of the hoisting rope 3. The non- conductive surface material 35 forms a coating adhering to the load bearing members 31-34. The non-conductive surface material 35 is preferably made of non-metallic material, such as polymer material, such as polyurethane for example.

[0048] With the non-conductive surface material 35, the load bearing members 31-34 are prevented from getting into contact with rope wheels or other components of the elevator that contact any of the lateral sides of the hoisting rope 3. Thus, the non-conductive surface material 35 isolates the load bearing members 31-34 from external components whereby the conductivity is not disturbed. With the non-conductive surface material 35, i.e. the coating, the hoisting rope 3 is also provided with a surface via which the hoisting rope 3 can effectively engage frictionally with a drive wheel of an elevator, for instance. Also, hereby the friction properties and/or other surface properties of the hoisting rope are adjustable, independently of the load bearing function, such that the hoisting rope perform wells in the intended use, for instance in terms of traction for transmitting force in longitudinal direction of the hoisting rope so as to move the hoisting rope with a drive wheel. Furthermore, the load bearing members 31-34 embedded therein are thus provided with protection. The coating 35 is preferably elastic. Elastic polymer material, for example polyurethane provides the hoisting rope 3 the desired frictional properties simply, good wear resistance as well as efficient protection for the load bearing members 31-34. Polyurethane is in general well suitable for elevator use, but also materials such as rubber or silicon or equivalent elastic materials are suitable for the material of the coating 35.

[0049] In an advantageous case, there are particularly four of said load bearing members 31-34 embedded adjacently in the non-conductive surface material 35, i.e. said coating 35. This is advantageous because thus, said at least two load bearing members 31-34 forming part of the circuit can belong to the same hoisting rope 3, as presented in Figure 2. In this case, said non-conductive surface material 35 isolates the at least two load bearing members 31-34 forming part of the circuit from each other. In one embodiment, one circuit can act as a signalling circuit conveying a data signal and another circuit can act as a charging circuit conveying an electrical charging current. In another embodiment, one circuit can act both as a signalling circuit and as a charging circuit conveying an electrical charging current and a data signal on top of said electrical charging current. However, the hoisting rope 3 could alternatively have any other number of load bearing members 31-34. For instance, the hoisting rope 3 could be made to have only one load bearing member 31-34, for instance. However, in this case the at least two load bearing members 31-34 forming part of the circuit are to belong to different hoisting ropes 3.

[0050] Said load bearing members 31-34 are electrically conductive load bearing members. Preferably, they are made of composite material comprising electrically conductive reinforcing fibers embedded in polymer matrix, said reinforcing fibers preferably being carbon fibers. With this kind of structure, the hoisting rope 3 has especially advantageous properties in elevator use, such as light weight and good tensile stiffness in longitudinal direction but still good conductivity across the load bearing member 31-34. The structure of the hoisting rope can be more specifically as described in document W02009090299A1. It is however not necessary that the load bearing members 31-34 are made of said composite, because the conductivity can be provided also by metallic load bearing members, such as metal cords. [0051] Figure 4 illustrates a preferred inner structure of one embodiment of the load bearing member according to the present invention. In Figure 4 the width direction w and the thickness direction t of a load bearing member 31 is shown. In Figure 4 the cross section of the load bearing member 31 as viewed in the longitudinal direction 1 of the load bearing member 31 is shown in particular. The hoisting rope could alternatively have some other number of load bearing members 31, either more or less than what is disclosed in the Figures.

[0052] The load bearing members 31-34 are made of composite material comprising reinforcing fibers F embedded in polymer matrix m. The reinforcing fibers F are more specifically distributed in polymer matrix m and bound together by the polymer matrix, particularly such that an elongated rod-like piece is formed. Thus, each load bearing member 31-34 is one solid elongated rod-like piece. The reinforcing fibers F are distributed preferably substantially evenly in the polymer matrix m. Thereby a load bearing member with homogeneous properties and structure is achieved throughout its cross section. In this way, it can be also ensured that each of the fibers can be in contact and bonded with the matrix m. Said reinforcing fibers F are most preferably carbon fibers as they are electrically conducting and have excellent properties in terms of load bearing capacity, weight, and tensile stiffness, which makes them particularly well suitable for use in elevator hoisting ropes. Alternatively, said reinforcing fibers F can be of any other fiber material which is electrically conducting. The matrix m comprises preferably of epoxy, but alternative materials could be used depending on the preferred properties. Preferably, substantially all the reinforcing fibers F of each load bearing member 31-34 are parallel with the longitudinal direction of the load bearing member 31-34. Thereby the fibers are also parallel with the longitudinal direction of the hoisting rope 3 as each load bearing member is oriented parallel with the longitudinal direction of the hoisting rope 3. Thereby, the fibers in the final hoisting rope 3 will be aligned with the force when the hoisting rope 3 is pulled, which ensures that the structure provides high tensile stiffness. This is also advantageous for achieving unproblematic behavior of the internal structure, particularly internal movement, when the hoisting rope 3 is bent.

[0053] The fibers F used in the preferred embodiments are substantially untwisted in relation to each other, which provides them said orientation parallel with the longitudinal direction of the hoisting rope 3. This is in contrast to the conventionally twisted elevator ropes, where the wires or fibers are strongly twisted and have normally a twisting angle from 15 up to 30 degrees, the fiber/wire bundles of these conventionally twisted elevator ropes thereby having the potential for transforming towards a straighter configuration under tension, which provides these ropes a high elongation under tension as well as leads to an unintegral structure.

[0054] The reinforcing fibers F are preferably long continuous fibers in the longitudinal direction of the load bearing member, the fibers F preferably continuing for the whole length of the load bearing member 31-34 as well as the hoisting rope 3. Thus, the load bearing ability, good conductivity as well as manufacturing of the load bearing member 31-34 are facilitated. The fibers F being oriented parallel with longitudinal direction of the hoisting rope 3, as far as possible, the cross section of the load bearing member 31-34 can be made to continue substantially the same in terms of its cross-section for the whole length of the hoisting rope 3. Thus, no substantial relative movement can occur inside the load bearing member 31-34 when it is bent.

[0055] As mentioned, the reinforcing fibers F are preferably distributed in the aforementioned load bearing member 31-34 substantially evenly, in particular as evenly as possible, so that the load bearing member 31-34 would be as homogeneous as possible in the transverse direction thereof. An advantage of the structure presented is that the matrix m surrounding the reinforcing fibers F keeps the interpositioning of the reinforcing fibers F substantially unchanged. It equalizes with its slight elasticity the distribution of a force exerted on the fibers, reduces fiber-fiber contacts and internal wear of the rope, thus improving the service life of the hoisting rope 3. The composite matrix m, into which the individual fibers F are distributed as evenly as possible, is most preferably made of epoxy, which has good adhesion to the reinforcement fibers F and which is known to behave advantageously with carbon fiber. Alternatively, e.g. polyester or vinyl ester can be used, but alternatively any other suitable alternative materials can be used. Figure 4 presents inside the circle a partial cross-section of the load bearing member 31- 34 close to the surface thereof as viewed in the longitudinal direction of the hoisting rope 3. The reinforcing fibers F of the load bearing member 31-34 are preferably organized in the polymer matrix m according to this cross-section. The rest (parts not showed) of the load bearing member 31-34 have a similar structure.

[0056] Figure 5 illustrates a three-dimensional view of a section of one embodiment of the load bearing member according to the present invention. From the presented Figure 4 and Figure 5 it can also be seen how the individual reinforcing fibers F of a load bearing member 31 are substantially evenly distributed in the polymer matrix m, which surrounds the reinforcing fibers F. The polymer matrix m fills the areas between individual reinforcing fibers F and binds substantially all the reinforcing fibers F that are inside the matrix m to each other as a uniform solid substance. A chemical bond exists between, the individual reinforcing fibers F (preferably each of them) and the matrix m, one advantage of which is uniformity of the structure. To improve the chemical adhesion of the reinforcing fiber to the matrix m, in particular to strengthen the chemical bond between the reinforcing fiber F and the matrix m, each fiber can have a thin coating, e.g. a primer (not presented) on the actual fiber structure between the reinforcing fiber structure and the polymer matrix m. However, this kind of thin coating is not necessary. The properties of the polymer matrix m can also be optimized as it is common in polymer technology. For example, the matrix m can comprise a base polymer material (e.g. epoxy) as well as additives, which fine-tune the properties of the base polymer such that the properties of the matrix are optimized. The polymer matrix m is preferably of a hard non-elastomer as in this case a risk of buckling can be reduced for instance. However, the polymer matrix need not be non-elastomer necessarily, e.g. if the downsides of this kind of material are deemed acceptable or irrelevant for the intended use. In that case, the polymer matrix m can be made of elastomer material such as polyurethane or rubber for instance. The reinforcing fibers F being in the polymer matrix means here that the individual reinforcing fibers F are bound to each other with a polymer matrix m, e.g. in the manufacturing phase by immersing them together in the fluid material of the polymer matrix which is thereafter solidified. In this case the gaps of individual reinforcing fibers bound to each other with the polymer matrix comprise the polymer of the matrix. In this way a great number of reinforcing fibers bound to each other in the longitudinal direction of the rope are distributed in the polymer matrix. As mentioned, the reinforcing fibers are preferably distributed substantially evenly in the polymer matrix m, whereby the load bearing member is as homogeneous as possible when viewed in the direction of the cross-section of the rope. In other words, the fiber density in the cross-section of the load bearing member 31-34 does not therefore vary substantially. The individual reinforcing fibers of the load bearing member 31-34 are mainly surrounded with polymer matrix m, but random fiber-fiber contacts can occur because controlling the position of the fibers in relation to each other in their simultaneous impregnation with polymer is difficult, and on the other hand, perfect elimination of random fiber-fiber contacts is not necessary from the viewpoint of the functioning of the solution. If, however, it is desired to reduce their random occurrence, the individual reinforcing fibers F can be pre-coated with material of the matrix m such that a coating of polymer material of said matrix is around each of them already before they are brought and bound together with the matrix material, e.g. before they are immersed in the fluid matrix material.

[0057] In the case of delamination of a load bearing member 31-34 the polymer matrix no longer supports all of the individual reinforcing fibers in a load bearing member 31-34. Consequently, in delamination some of said individual reinforcing fibers detach from one another in the longitudinal direction.

[0058] As above mentioned, the matrix m of the load bearing member 31-34 is most preferably hard in its material properties. A hard matrix m helps to support the reinforcing fibers F, especially when the rope bends, preventing buckling of the reinforcing fibers F of the bent rope, because the hard material supports the fibers F efficiently. To reduce the buckling and to facilitate a small bending radius of the load bearing member 31-34, among other things, it is therefore preferred that the polymer matrix m is hard, and in particular non-elastomeric. The most preferred materials for the matrix are epoxy resin, polyester, phenolic plastic, or vinyl ester. The polymer matrix m is preferably so hard that its module of elasticity E is over 2 GPa, most preferably over 2.5 GPa. In this case the module of elasticity E is preferably in the range 2.5-10 GPa, most preferably in the range 2.5-3.5 GPa. There are commercially available various material alternatives for the matrix m which can provide these material properties. [0059] Preferably over 50% of the surface area of the cross-section of the load bearing member 31-34 is of the aforementioned electrically conducting reinforcing fiber. Thereby, good conductivity can be ensured. Fibers F will be in contact with each other randomly along their length whereby magnetic fields signal inserted into the load bearing member remains within substantially the whole cross section of the load bearing member. To be more precise preferably 50%-80% of the surface area of the cross-section of the load bearing member 31- 34 is of the aforementioned reinforcing fiber, most preferably such that 55%-70% is of the aforementioned reinforcing fiber, and substantially all the remaining surface area is of polymer matrix. In this way conductivity and longitudinal stiffness of the load bearing member 31-34 are facilitated yet there is enough matrix material to bind the fibers F effectively to each other. Most preferably, this is carried out such that approx. 60% of the surface area is of reinforcing fiber and approx. 40% is of matrix material.

[0060] Figure 6 illustrates a stepwise cross-sectional view of another embodiment of a hoisting rope of an elevator according to the present invention. Figure 6 illustrates a hoisting rope of an elevator according to another embodiment of the present invention. In the presented embodiment, the hoisting rope 4 comprises a plurality of first conductive load bearing members 41 for, in part, bearing the load exerted on the hoisting rope 4 in longitudinal direction thereof, which first conductive load bearing members 41 are conductive corded cables wound around a center part 40 of the hoisting rope 4.

[0061] In the presented embodiment, the hoisting rope 4 also comprises a non-conductive coating 43, said non-conductive coating 43 covering said plurality of first conductive load bearing members 41. In the presented embodiment, the said non-conductive coating 43 covers completely said conductive corded cables wound around a center part 40 of the hoisting rope 4. The non-conductive coating 43 is preferably elastic. Elastic polymer material, for example polyurethane provides the hoisting rope 4 the desired frictional properties simply, good wear resistance as well as efficient protection for the first conductive load bearing members 41. Polyurethane is in general well suitable for elevator use, but also materials such as rubber or silicon or equivalent elastic materials are suitable for the material of the coating 43.

[0062] In the presented embodiment, the hoisting rope 4 also comprises a plurality of second conductive load bearing members 42 for bearing the load exerted on the hoisting rope 4 in longitudinal direction thereof, which second conductive load bearing members 42 are conductive corded cables wound around said coated first conductive load bearing members 41 and said non-conductive coating 43. In the presented embodiment said non-conductive coating 43 forms an isolating layer covering said plurality of first conductive load bearing members 41 and isolating them from said second conductive load bearing members 42 of the hoisting rope 4 both mechanically and electrically. The said conductive load bearing members 41, 43 may be made of metal material, of metal alloy material or of electrically conducting composite material. In the presented embodiment, the hoisting rope 4 may also comprise one or more optic fibers in said hoisting rope 4 for transferring data. Said one or more optic fibers may be embedded in the center part 40 of the hoisting rope 4.

[0063] Figure 7 illustrates preferred details of a counterweight arrangement according to one embodiment of the present invention. The end of each hoisting rope 3, 4 has been fixed to the counterweight 2 with a rope fixing means RF. The counterweight 2 has been mounted to travel along guide rails G guided by guide members g mounted on the counterweight 2. The illustrated counterweight arrangement also comprises a battery 21, a counterweight control unit 22 and a safety gear arrangement 23.

[0064] Each said guide member g may be any guide member suitable for leaning in horizontal direction against a vertical guide rail G and to travel along it. The guide members g are preferably either in the form of roller guides or slider guides. In the presented embodiment, there are two of said guide rails G, and two guide members g mounted on the counterweight 2 per each guide rail G. In the Figure, there is illustrated only one counterweight position sensor 9 mounted on the counterweight and arranged to sense position of the counterweight relative to a guide rail G. However, it is preferable that the elevator comprises per each guide rail G at least one counterweight position sensor 9 mounted on the counterweight and arranged to sense position of the counterweight relative to the guide rail G in question. [0065] In the present embodiment, the supply of electricity from the elevator car 1 to the counterweight 2 and to the battery 21 of the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Furthermore, in the present embodiment, data transfer between the elevator car 1 and the counterweight control unit 22 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. In the presented embodiment, said counterweight control unit 22 is arranged to receive electricity from and/or transfer data with the battery 21 of the counterweight 2. Likewise, said safety gear arrangement 23 is arranged to receive electricity and/or data from the battery 21 of the counterweight 2 via said counterweight control unit 22.

[0066] Figure 8 illustrates a functional view of an elevator according to another embodiment of the present invention. In the presented embodiment, the elevator comprises a hoistway and an elevator car 1 vertically movable in the hoistway and a counterweight 2 vertically movable in the hoistway. The elevator also comprises one or more hoisting ropes 3, 4 interconnecting the elevator car 1 and the counterweight 2, one end of each hoisting rope 3, 4 being fixed to the elevator car 1 and the other end of each hoisting rope 3, 4 being fixed to the counterweight 2, and each hoisting rope 3, 4 comprising one or more conductive load bearing members that extend unbroken throughout the length of the hoisting rope 3, 4. In the presented another embodiment, the elevator also comprises a drive machine comprising a motor and a rotatable drive member 6, a drive wheel 6, said drive wheel 6 engaging said one or more hoisting ropes 3, 4 connected to the elevator car 1 and to the counterweight 2.

[0067] In the presented embodiment, the elevator car 1 of the elevator comprises a car control unit 12, which car control unit 12 controls certain functions of the elevator car 1 and is connected to said elevator control system. In the presented embodiment, the elevator car 1 of the elevator also comprises a battery 11 and a communication unit 13. Furthermore, in the presented embodiment, the counterweight 2 of the elevator comprises a counterweight control unit 22, which counterweight control unit 22 controls certain functions of the counterweight 2 and is connected to said elevator control system. In the presented embodiment, the counterweight 2 of the elevator also comprises a battery 21 and a safety gear arrangement 23.

[0068] In the present embodiment, the supply of electricity from the elevator car 1 to the counterweight 2 and to the battery 21 of the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, in the present embodiment, data transfer between the elevator car 1 and the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. In the presented embodiment, said counterweight control unit 22 is arranged to receive electricity from and/or transfer data with the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2. Likewise, said safety gear arrangement 23 is arranged to receive electricity and/or data from the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2, possibly via said counterweight control unit 22.

[0069] In the present embodiment, the elevator car 1 of the elevator comprises a battery 11 for supplying electricity to the elevator car 1. Said battery 11 of the elevator car 1 is also used for supplying electricity to the counterweight 2 and to the battery 21 of the counterweight 2 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, said battery 21 of the counterweight 2 may be also used for supplying electricity to the elevator car 1 and to the battery 11 of the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Said battery 11 of the elevator car 1 may be charged wirelessly. Likewise, said battery 21 of the counterweight 2 may be charged wirelessly.

[0070] In the present embodiment, the elevator car 1 of the elevator comprises a communication unit 13 for transferring data wirelessly between the elevator control system and the elevator car 1 and for transferring data between the elevator control system and the car control unit 12 of the elevator car 1. Said communication unit 13 is also used for transferring data between the elevator car 1 and the counterweight 2 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. [0071] Figure 9 illustrates a functional view of an elevator according to a third embodiment of the present invention. In the presented embodiment, the elevator comprises a hoistway and an elevator car 1 vertically movable in the hoistway and a counterweight 2 vertically movable in the hoistway. The elevator also comprises one or more hoisting ropes 3, 4 interconnecting the elevator car 1 and the counterweight 2, one end of each hoisting rope 3, 4 being fixed to the elevator car 1 and the other end of each hoisting rope 3, 4 being fixed to the counterweight 2, and each hoisting rope 3, 4 comprising one or more conductive load bearing members that extend unbroken throughout the length of the hoisting rope 3, 4. In the presented another embodiment, the elevator also comprises a drive machine comprising a motor and a rotatable drive member 6, a drive wheel 6, said drive wheel 6 engaging said one or more hoisting ropes 3, 4 connected to the elevator car 1 and to the counterweight 2. The elevator according to the presented embodiment also comprises a travelling cable 7, which hangs from the elevator car 1 and connected to a hoistway connection 8 at the hoistway. In an alternative embodiment of the present invention, the travelling cable 7 of the elevator connected to the hoistway connection 8 may hang from the counterweight 2. In the present embodiment, said travelling cable 7 comprises two or more conductive members that extend unbroken throughout the length of said travelling cable 7. Alternatively, said travelling cable 7 may also be realized as two or more cables 7, each cable 7 comprising one or more conductive members that extend unbroken throughout the length of said cable 7.

[0072] In the presented embodiment, the elevator car 1 of the elevator comprises a car control unit 12, which car control unit 12 controls certain functions of the elevator car 1 and is connected to said elevator control system. In the presented embodiment, the elevator car 1 of the elevator also comprises a battery 11. Furthermore, in the presented embodiment, the counterweight 2 of the elevator comprises a counterweight control unit 22, which counterweight control unit 22 controls certain functions of the counterweight 2 and is connected to said elevator control system. In the presented embodiment, the counterweight 2 of the elevator also comprises a battery 21 and a safety gear arrangement 23.

[0073] In the present embodiment, the supply of electricity from the elevator car 1 to the counterweight 2 and to the battery 21 of the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, in the present embodiment, data transfer between the elevator car 1 and the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. In the presented embodiment, said counterweight control unit 22 is arranged to receive electricity from and/or transfer data with the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2. Likewise, said safety gear arrangement 23 is arranged to receive electricity and/or data from the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2, possibly via said counterweight control unit [0074] In the presented embodiment, the supply of electricity to the elevator car 1 is realized via said hoistway connection 8 at the hoistway and via said plurality of conductive members of said travelling cable 7. Likewise, in the presented embodiment, data transfer between the elevator control system and the elevator car 1 is realized via said hoistway connection 8 at the hoistway and via said plurality of conductive members of said travelling cable 7. In the present embodiment, the elevator car 1 of the elevator comprises a battery 11 for storing and supplying electricity to the elevator car 1. Said battery 11 of the elevator car 1 is charged via said plurality of conductive members of said travelling cable 7. Said battery 11 of the elevator car 1 is also used for supplying electricity to the counterweight 2 and to the battery 21 of the counterweight 2 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, said battery 21 of the counterweight 2 may be also used for supplying electricity to the elevator car 1 and to the battery 11 of the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4.

[0075] Figure 10 illustrates a functional view of an elevator according to a fourth embodiment of the present invention. In the presented embodiment, the elevator comprises a hoistway and an elevator car 1 vertically movable in the hoistway, a counterweight 2 vertically movable in the hoistway and one or more hoisting ropes 3, 4 interconnecting the elevator car 1 and the counterweight 2. In the presented another embodiment, the elevator also comprises a drive machine comprising a motor and a rotatable drive member 6, a drive wheel 6, said drive wheel 6 engaging said one or more hoisting ropes 3, 4 connected to the elevator car 1 and to the counterweight 2. [0076] In the presented embodiment, the elevator car 1 of the elevator comprises a car control unit 12, which car control unit 12 controls certain functions of the elevator car 1 and is connected to said elevator control system. In the presented embodiment, the elevator car 1 of the elevator also comprises a battery 11, a communication unit 13 and a battery-charging unit 14. Furthermore, in the presented embodiment, the counterweight 2 of the elevator comprises a counterweight control unit 22, which counterweight control unit 22 controls certain functions of the counterweight 2 and is connected to said elevator control system. In the presented embodiment, the counterweight 2 of the elevator also comprises a battery 21 and a safety gear arrangement 23. [0077] In the present embodiment, the supply of electricity from the elevator car 1 to the counterweight 2 and to the battery 21 of the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. Likewise, in the present embodiment, data transfer between the elevator car 1 and the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. In the presented embodiment, said counterweight control unit 22 is arranged to receive electricity from and/or transfer data with the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2. Likewise, said safety gear arrangement 23 is arranged to receive electricity and/or data from the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 or from the battery 21 of the counterweight 2, possibly via said counterweight control unit 22.

[0078] In the present embodiment, the elevator car 1 of the elevator comprises a battery 11 for supplying electricity to the elevator car 1. Said battery 11 of the elevator car 1 is also used for supplying electricity to the counterweight 2 and/or to the battery 21 of the counterweight 2 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4.

[0079] The battery 11 of the elevator car 1 may be charged via the battery- charging unit 14. Said battery-charging unit 14 may be connectable to an electricity supply arranged in the hoistway. In an alternative embodiment, said battery 11 of the elevator car 1 may be charged wirelessly. In another alternative embodiment of the present invention, the counterweight 2 of the elevator comprises a battery charging unit. In said another alternative embodiment, the battery-charging unit of the counterweight 2 may connect to an electricity supply arranged in the hoistway and the battery 21 of the counterweight 2 may be charged via a wired connection or wirelessly. In said another alternative embodiment, said battery 21 of the counterweight 2 is used for supplying electricity to the elevator car 1 and/or to the battery 11 of the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4.

[0080] In the present embodiment, the elevator car 1 of the elevator comprises a communication unit 13 for transferring data wirelessly between the elevator control system and the elevator car 1 and for transferring data between the elevator control system and the car control unit 12 of the elevator car 1. Said communication unit 13 is also used for transferring data between the elevator car

1 and the counterweight 2 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4.

[0081] With the help of the present invention, a continuous, reliable, and immediate power supply is provided to said counterweight 2 of the elevator and also to the safety gear arrangement 23 of the counterweight 2. Said the safety gear arrangement 23 may be an electrical overspeed governor arrangement (OSG) 23, an electrical safety gear (SG) 23 or an electrical gripper arrangement 23.

[0082] Said battery 21 of the counterweight 2 may be charged via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4 using low electric current. Low electric current results in low resistive power loss in hoisting ropes 3, 4. With the help of the present invention, said battery 21 of the counterweight 2 can quickly supply a lot of electric power to the counterweight 2 when needed. In an alternative embodiment, said battery 21 of the counterweight

2 may be charged wirelessly. [0083] In the present embodiment, data transfer between the elevator car 1 and the counterweight 2 is realized via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. With the help of the data transfer between elevator car 1 and counterweight 2 the status of the safety gear arrangement 23 as well as the charge status of the battery 21 of the counterweight 2 can be controlled. The data transfer between elevator car 1 and counterweight 2 can also be used for condition monitoring of roller guide shoe bearings and other components of the counterweight 2. Data transfer can happen also via one or more optic fibers in the ropes. In the present embodiment, several parallel ropes for supplying electricity or using several parallel ropes for transferring data may be used for increased redundancy.

[0084] With the help of the present invention data can be transferred from the counterweight 2 to the elevator car 1 and/or to the car control unit 12 of the elevator car 1 via said plurality of conductive load bearing members of said one or more hoisting ropes 3, 4. The transferred data may comprise speed data of said counterweight 2, vertical position data of said counterweight 2, counterweight component maintenance data, counterweight battery capacity data, acceleration measurement data of said counterweight 2 and/or safety gear arrangement status data. [0085] When referring to conductivity, in this application it is meant electrical conductivity.

[0086] It is to be understood that the above description and the accompanying Figures are only intended to teach the best way known to the inventors to make and use the invention. It will be apparent to a person skilled in the art that the inventive concept can be implemented in various ways. The above- described embodiments of the invention may thus be modified or varied, without departing from the invention, as appreciated by those skilled in the art in light of the above teachings. It is therefore to be understood that the invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims and their equivalents.

Claims (26)

1. An elevator comprising: an elevator car (1); - a counterweight (2); and one or more ropes (3), (4) interconnecting the car (1) and counterweight (2), one end of each rope (3), (4) being fixed to the elevator car (1) and the other end of each rope (3), (4) being fixed to the counterweight (2), and each rope (3), (4) comprising one or more conductive load bearing members (31-34), (41), (42) that extend unbroken throughout the length of the rope (3), (4), wherein the supply of electricity between said elevator car (1) and said counterweight (2) and/or the data transfer between said elevator car (1) and said counterweight (2) is realized via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4).

2. An elevator according to claim 1, wherein said one or more ropes (3), (4) comprise one or more hoisting belts (3), one or more hoisting ropes (4) or one or more hoisting cables.

3. An elevator according to claim 1 or claim 2, wherein said counterweight (2) comprises a safety gear arrangement (23).

4. An elevator according to claim 3, wherein said counterweight (2) comprises a counterweight battery (21), said counterweight battery (21) arranged to receive supply of electricity from said elevator car (1) via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4), and said counterweight battery (21) arranged to supply electricity to said safety gear arrangement (23).

5. An elevator according to claim 4, wherein said elevator car (1) is arranged to receive supply of electricity from said counterweight battery (21) via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4).

6. An elevator according to claim 4 or claim 5, wherein said counterweight (2) comprises a counterweight control unit (22), said counterweight control unit (22) arranged to receive supply of electricity from and/or transfer data with said elevator car (1) via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4), and said counterweight control unit (22) arranged to transfer electricity and/or data to said safety gear arrangement (23).

7. An elevator according to claim 6, wherein said safety gear arrangement (23) comprises activating means energized by electricity from said counterweight control unit (22).

8. An elevator according to any of the preceding claims 1-7, wherein said one or more ropes (3) comprises a non-conductive coating (35), said one or more conductive load bearing members (31-34) being embedded in said coating (35), said coating (35) forming the surface of said one or more ropes (3), and extending between adjacent load bearing members (31-34) thereby isolating them from each other.

9. An elevator according to any of the preceding claims 1-8, wherein said conductive load bearing members (31-34) are made of non-metal material, e.g. of composite material comprising electrically conducting reinforcing fibers (F) in polymer matrix (m), said reinforcing fibers (F) preferably being carbon fibers.

10. An elevator according to claim 8 or to claim 9, wherein said one or more ropes (3) comprise one or more optic fibers in said ropes (3).

11. An elevator according to any of the preceding claims 1-7, wherein said one or more ropes (4) comprise: a plurality of first conductive load bearing members (41); a non-conductive coating (43), said non-conductive coating (43) covering said plurality of first conductive load bearing members (41); and a plurality of second conductive load bearing members (42) wound around said coated first conductive load bearing members (41) and said non-conductive coating (43).

12. An elevator according to claim 11, wherein said one or more ropes (4) comprise one or more optic fibers in said ropes (4).

13. An elevator according to any of the preceding claims 1-12, comprising: an elevator control system; a travelling cable (7), which travelling cable (7) hangs from the elevator car (1), and comprises two or more conductive members that extend unbroken throughout the length of said travelling cable (7), and which travelling cable (7) is connected to a hoistway connection (8) at the hoistway; wherein the supply of electricity to said elevator car (1) and/or the data transfer between said elevator control system and said elevator car (1) is realized via said plurality of conductive members of said travelling cable

(7).

14. An elevator according to any of the preceding claims 1-13, wherein said elevator car (1) comprises a battery (11).

15. An elevator according to claim 14, wherein said elevator car (1) comprises a battery-charging unit (14) arranged for charging said battery (11) of the elevator car (1).

16. An elevator according to claim 14 or claim 15, wherein said battery

(11) of the elevator car (1) and/or said battery (21) of the counterweight (2) is/are arranged for being charged wirelessly.

17. An elevator according to any of the preceding claims 1-12, comprising: an elevator control system; a travelling cable (7), which travelling cable (7) hangs from the counterweight (2), and comprises two or more conductive members that extend unbroken throughout the length of said travelling cable (7), and which travelling cable (7) is connected to a hoistway connection (8) at the hoistway; wherein the supply of electricity to said counterweight (2) and/or the data transfer between said elevator control system and said counterweight (2) is realized via said plurality of conductive members of said travelling cable (7).

18. An elevator according to any of the preceding claims 1-17, wherein said counterweight (2) comprises a battery (21).

19. An elevator according to claim 18, wherein said counterweight (2) comprises a batteiy-charging unit arranged for charging said battery (21) of the counterweight (2).

20. An elevator according to claim 18 or claim 19, wherein said battery (11) of the elevator car (1) and/or said battery (21) of the counterweight

(2) is/are arranged for being charged wirelessly.

21. An elevator according to any of the preceding claims 13-20, wherein said elevator car (1) or said counterweight (2) comprises a communication unit (13) arranged for wirelessly transferring data between said elevator control system and the elevator car (1) or the counterweight (2).

22. An elevator according to claim 21, wherein said communication unit (13) is arranged for transferring data between said elevator car (1) and said counterweight (2) via said conductive load bearing members (31-34), (41), (42) of said one or more ropes (3), (4).

23. An elevator according to any of the preceding claims 1-22, wherein said counterweight (2) comprises an at least one speed sensor arranged to measure the speed of said counterweight (2).

24. An elevator according to any of the preceding claims 1-23, wherein said counterweight (2) comprises an at least one position sensor arranged to measure the vertical position of said counterweight (2).

25. An elevator according to any of the preceding claims 1-24, wherein said counterweight (2) comprises an at least one acceleration sensor arranged to measure the acceleration of said counterweight (2).

26. An elevator according to any of the preceding claims 23-25, wherein the activating means of the safety gear arrangement (23) of said counterweight (2) are activated in response to an output from said at least one speed sensor and/or said at least one position sensor and/or said at least one acceleration sensor.