Abstract: The invention relates to a method for replacing the hoisting ropes of an elevator. By the method of the invention, the hoisting ropes (4) are replaced by first joining the old and new hoisting ropes (4a, 4b) together by their one ends by splicing the ends together around a common core strand (17), whereupon the new set (4b) of hoisting ropes is pulled into place by means of the old set (4a) of hoisting ropes.

Abstract: An illustrative method of making a load bearing member for use in an elevator system includes mechanically roughening at least one surface on an exterior of a jacket of the load bearing member to establish a friction characteristic that facilitates engagement between an elevator system sheave and the roughened surface.

Abstract: An elevator system has two elevator cars arranged one over the other, but that can travel independently of each other. Both elevator cars are suspended on suspension and traction mechanisms and each is coupled to a separate counterweight. Both elevator cars have a lower cable, wherein the two lower cables are tensioned by separate tension devices. The lower cable of the first, lower elevator car is fastened to the first elevator car and the first counterweight, The lower cable of the second, upper elevator car is guided at the second elevator car and at least one of the two lower cable ends thereof is secured by a weighted body secured in place with play and/or free-floating.

Abstract: The object of the invention is an elevator arrangement, which comprises at least an elevator car configured to move up and down in an elevator hoistway and at least two compensating weights, which are for their part connected to support the elevator car by the aid of their own support means, such as by the aid of ropes or belts and also e.g. diverting pulleys, and a hoisting machine provided with at least one traction sheave or corresponding, and at least one traction means such as a rope or belt, which is configured to transmit the rotational movement of the traction sheave into movement of the elevator car and of the compensating weights. Each compensating weight is connected by the aid of a traction means to the same hoisting machine.

Abstract: An elevator may include an elevator car, a set of hoisting ropes, a traction sheave, and a compensating device. The set of hoisting ropes may include first and second rope portions. The elevator car may include one or more first diverting pulleys from which the first rope portions extend upward. The elevator car may include one or more second diverting pulleys from which the second rope portions extend downward. The first rope portions may be under a first rope tension. The second rope portions may be under a second rope tension that is different from the first rope tension. The compensating device may act in substantially opposite directions on the first and second rope portions. The compensating device may produce an auxiliary force acting substantially in a same direction as the first rope tension.

Abstract: An exemplary elevator system includes an elevator car. At least one guiderail guides movement of the elevator car. The guiderail has a length in a direction of movement of the elevator car and a depth generally perpendicular to the length. A plurality of flat belts are situated relative to the elevator car such that movement of the flat belts for causing movement of the elevator car is approximately four times a corresponding movement of the elevator car. A plurality of sheaves is situated for directing the flat belts as the belts at least partially wrap around the sheaves. The plurality of sheaves remains fixed near one end of the guide rail. The plurality of sheaves rotate about coaxially aligned axes and have a collective width along the axes that is no greater than the depth of the guiderail.

Abstract: A method for installing the ropes of an elevator in an elevator system comprising the ropes, a diverting pulley and a frame structure for rotatably supporting the diverting pulley in place, the method including the steps of mounting the ropes on the diverting pulley and mounting the diverting pulley together with the ropes in the frame structure or, alternatively, passing the ropes via a guiding device of the frame structure and mounting the diverting pulley and a supporting element in the frame structure. Also, an elevator comprising at least one diverting pulley mounted in place by means of a frame structure and a set of ropes having a number of ropes, the passage of which has been arranged using at least one diverting pulley.

Abstract: An elevator system includes an elevator car, one or more sheaves, and one or more belts operably connected to the car and interactive with the one or more sheaves for suspending and/or driving the elevator car. The one or more belts include a plurality of wires arranged into one or more cords, and a jacket substantially retaining the one or more cords. A cord ratio, between a smallest sheave diameter (D) of the one or more sheaves of the elevator system that are interactive with the belt and a largest cord diameter (dc) of the one or more cords, (D/dc) is less than about 55. A wire ratio, between the smallest sheave diameter (D) and the largest wire diameter (dw) of the plurality of wires, (D/dw) is between about 160 and about 315.

Abstract: An elevator includes a set of hoisting ropes supporting a counterweight and an elevator car moving on respective tracks, each hoisting rope having a substantially round cross-section, and a hoisting machine engaging the set of hoisting ropes via a traction sheave. The traction sheave has a plurality of rope grooves. Each of the plurality of rope grooves generally conforms to a substantially circular shape. Each of the plurality of rope grooves has an opening for receiving a hoisting rope from among the set of hoisting ropes. A coating is adhesively bonded to each of the plurality of rope grooves. Each hoisting rope has a diameter below 8 mm. Each hoisting rope is composed of steel wires having a strength exceeding 2000 N/mm2. A contact angle between the set of hoisting ropes and the traction sheave is greater than about 180 degrees.

Abstract: A lift cage includes a platform having a plurality of platform sections. The cage includes a front-sided and a rear-sided platform section arranged on a central platform section. The platform sections have connection points which are arranged on parallel, vertical planes, whereon the platform sections can be connected together by connection elements. In order to provide additional stabilization for the cage platform, stable platform edge profiles are connected to the uppersides of all platform sections. Subsystems of the lift cage can be premounted in the platform sections. A method for installing a lift wherein a cage platform is prepared in at least two separate platform sections, and the platform sections of the cage platform, which are delivered separately, are connected together by connection elements during installation.

Abstract: An elevator installation includes a drive unit moving a car and a counterweight in an elevator shaft. The drive unit has a drive motor and a brake coupled to a drive shaft and mounted on a crossbeam in the elevator shaft or on the shaft ceiling. The drive unit has two spaced-apart drive zones and the drive motor is arranged to the left or the right of the two drive zones with the brake on the same side or the opposite side of the drive zones.

Abstract: An elevator load bearing member assembly includes at least one roughened surface (46) on a polyurethane jacket (44). In one example, mechanical roughening is used to roughen the surface (46) after the jacket has been extruded onto tension members (42). In another example, the temperatures used for molding a jacket (44) are controlled to induce melt fracture and roughen the surface (46) during the forming process. Other examples include chemically roughening the jacket surface and using localized heating to roughen the surface. The roughened jacket surface improves friction characteristics of a load bearing member assembly.

Abstract: An elevator system which utilizes four or more independently moving cabs in each elevator shaft. The lower cabs are connected to four spatially separated counterweights at four different counterweight connection points. The connection points are horizontally shifted on different cabs in order to prevent interference between cables, pulleys and counterweights. The top cab may be connected to one or two counterweights by connection points on the roof of the cab. The cabs are mounted on two tracks, each track on one side of the elevator shaft. The system includes a motor attached to each of the cabs by lift cables to facilitate the independent movement of all cabs. Existing buildings can be retrofit for compatibility with the present invention.

Abstract: An elevator car assembly includes a car frame, a car connected to the car frame and having a first guide axis between a first side and a second side of the car frame, a plurality of traction members, a first plurality of sheaves rotatably connected to the car frame between the first side and the second side for respectively receiving the plurality of traction members, and a first guide attached to either the car frame or the car below the first plurality of sheaves for movably engaging a first rail. The first guide is aligned with the first guide axis and is configured to be aligned with the first rail. One of the plurality of traction members and the first guide are vertically aligned at the first guide axis.

Abstract: An elevator installation comprises a drive frame and a drive unit, wherein a support element couples an elevator cage with a counterweight, wherein a drive roller and a spacer roller are mounted at the drive frame on a mounting device associated therewith, wherein the support element is guided over the spacer roller of the drive roller, wherein at least one of the mounting devices is fixable to the drive frame at at least two positions so that a horizontal support element spacing is thereby variable and wherein a portion of the support element between the drive roller and the spacer roller is substantially rectilinear.

Abstract: A method for installing, securing, or installing and securing at least one rope pulley of an elevator may include: arranging a set of ropes of the elevator and the at least one rope pulley, in a rigged or unrigged state, near an elevator car of the elevator or in a shaft of the elevator; and detachably mounting the at least one rope pulley to the elevator car, a frame structure of the elevator car, or a guide rail of the elevator car using a quick coupling. The elevator may include the ropes, the at least one rope pulley, the elevator car, and elevator car guide rails. The ropes may pass around the at least one rope pulley. The at least one rope pulley may be adapted to detachably mount to the elevator car, the frame structure, or one of the elevator car guide rails using a quick coupling.

Abstract: A single support device (30) is adapted to support and secure a machine (34) at least one sheave (38) and a plurality of termination members (44, 46). The single support device (30) is conveniently installed within a hoistway (26) or within a machine room (90). The machine (34) and sheave (38) may be premounted to the support device (30) and the entire assembly can be lowered into position by crane (300).

Abstract: An elevator includes hoisting ropes and a compensating device. The hoisting ropes include first rope portions under a first rope tension that go upward from an elevator car and second rope portions under a different, second rope tension that go downward from the elevator car. The compensating device acts in substantially opposite directions on the first and second rope portions in order to do one or more of the following: equalize the first, second, or first and second rope tensions; compensate the rope tensions between the first and second rope tensions; equalize rope elongation in the first, second, or first and second rope portions; compensate the rope elongations between the first and second rope portions; and render a ratio of the first rope tension to the second rope tension substantially constant. The compensating device produces an auxiliary force acting substantially in a same direction as the first rope tension.

Abstract: An elevator may include an elevator car, a set of hoisting ropes, a traction sheave, and a compensating device. The set of hoisting ropes may include first and second rope portions. The elevator car may include one or more first diverting pulleys from which the first rope portions extend upward. The elevator car may include one or more second diverting pulleys from which the second rope portions extend downward. The first rope portions may be under a first rope tension. The second rope portions may be under a second rope tension that is different from the first rope tension. The compensating device may act in substantially opposite directions on the first and second rope portions. The compensating device may produce an auxiliary force acting substantially in a same direction as the first rope tension.

Abstract: A transmission belt for driving and/or supporting an elevator car has a longitudinally extending body including an area tensile layer reinforced by chemical fibers. The belt can have a flat friction layer or a friction layer including alternating longitudinally extending wedge-shaped ribs and grooves. Transverse grooves can be formed across the width of the longitudinally grooved friction layer.

Abstract: A method for installing the hoisting roping of an elevator, the elevator including at least an elevator car that moves in essentially a vertical direction in the elevator hoistway, a hoisting machine, a traction sheave, and at least a plurality of diverting pulleys includes fitting a plurality of hoisting ropes to pass around a plurality of diverting pulleys as well as the traction sheave, the hoisting ropes, after the installation, forming the hoisting roping of the elevator. Each hoisting rope is guided to pass around each diverting pulley and/or the traction sheave such that a loop is formed from the part between the first and second end of the hoisting rope, the loop being fitted to pass around the diverting pulley and/or the traction sheave.

Abstract: A machineroom-less elevator in which a counterweight is vertically moved behind a cage, with the cage and the counterweight being suspended in a jig back manner through a first and second diverting sheaves. In this machineroom-less elevator, a sufficiently large vertical stroke of the counterweight can be secured, while a durability of a hoist rope is improved. In addition, since no tensile difference is generated in respective parts of the hoist rope, vertical vibrations of the cage are prevented when the cage restarts a vertical movement. A traction sheave is disposed on one of right and left sidewalls of an elevator shaft. A first diverting sheave is disposed below and sufficiently apart from the traction sheave, and a second diverting sheave is disposed on a top of a rear wall of the elevator shaft.

Abstract: An apparatus for automatically equalizing the uneven tension between ropes of an elevator in combination with a load cell to determine elevator load. The load of an elevator car having multiple tension members is automatically balanced while load is measured using a single load cell. The incorporation of a load cell with an autobalancing system allows for an accurate measure of an elevator load to be taken while providing the benefits of having uniform rope lengths in the elevator system. The apparatus may have various arrangements, including an in-line configuration and a grouped configuration. The apparatus may also dampen the vibration energy that is usually imparted to an elevator car.

Abstract: A transmission belt for driving and/or supporting an elevator car has a longitudinally extending body including an area tensile layer reinforced by chemical fibers. The belt can have a flat friction layer or a friction layer including alternating longitudinally extending wedge-shaped ribs and grooves. Transverse grooves can be formed across the width of the longitudinally grooved friction layer.

Abstract: A drive arrangement for an elevator car and a machine roomless elevator incorporates a machine having a drive sheave, a pair of right and left car side sheaves disposed beneath the car, a counterweight with a pair of top mounted sheaves, and a hoist cable including a plurality of ropes. The car is shifted to one side of the hoistway and the car guide rails are shifted forward in the hoistway in order to create a large pocket in a rear corner of the hoistway for the counterweight. In this manner, the elevator car can nest beside the machine in the top of the hoistway limiting the required top hoistway space and creating a minimal hoistway footprint.

Abstract: An elevator, preferably an elevator without counterweight, comprising a number of diverting pulleys in the upper part of an elevator shaft or equivalent, a number of diverting pulleys in the lower part of the elevator shaft and a number of diverting pulleys on an elevator car, is installed in such manner that at least some of the diverting pulleys for the upper part are rigged in the lower part of the elevator shaft and at least some of the diverting pulleys from which the passage of the ropes is directed upwards are rigged at the same time. The diverting pulleys for the upper part thus rigged are raised in the rigged state to the upper part of the elevator shaft or equivalent and mounted in place.

Abstract: An elevator having an elevator car with a car frame on which are mounted a first set of diverting pulleys from which the hoisting ropes go downwards and a second set of diverting pulleys from which the hoisting ropes go upwards. The rope tension in the rope portions going from the diverting pulleys of the first set is smaller than the rope tension in the rope portions going from the diverting pulleys of the second set by a specified ratio. According to the invention, the diverting pulleys of the first set are at a larger average distance from the car frame than the diverting pulleys of the second set. In a possible inventive arrangement, the distance of an up-direction diverting pulley from the car frame is smaller by a specified ratio than the distance a corresponding down-direction diverting pulley.

Abstract: A system and method for minimizing compensation rope sway by altering the natural frequency of compensation ropes using servo actuators. The rope sway may be minimized by moving the compensation sheave to adjust the tension of the compensation rope or adjusting the position of the termination of a compensation rope to account for changes in the position of a structure. Servo actuators may also be used to re-level the elevator car to account for rope stretch.

Abstract: A method for installing an elevator may include stopping an elevator car or partially completed elevator car in the upper part of an elevator shaft; rigging first portions of hoisting ropes between the car and diverting pulleys in the upper part of the shaft so that the first portions pass via the diverting pulleys in the upper part of the shaft and first diverting pulleys on the car; moving the car to the lower part of the shaft, while supplying ropes from rope reels to the first portions between the car and the diverting pulleys in the upper part of the shaft; and rigging second portions of the hoisting ropes between the car and diverting pulleys in the lower part of the shaft so that the second portions pass via the diverting pulleys in the lower part of the shaft and second diverting pulleys on the car.

Abstract: An elevator may include an elevator car, one or more hoisting ropes, a traction sheave, an overspeed governor, at least one safety gear, a locking mechanism, and guide rails. The car may be suspended by the one or more hoisting ropes. The traction sheave may move the car using the one or more hoisting ropes. The at least one safety gear and locking mechanism may be fitted in conjunction with the car. The overspeed governor may be configured to activate and release, via a linkage, the at least one safety gear during operation of the elevator. The locking mechanism may be configured to activate and release, by operatively acting on the linkage, the at least one safety gear during installation, maintenance, or installation and maintenance of the elevator. When activated, the at least one safety gear may engage one of the guide rails to lock the car in place.

Abstract: In an elevator, with an elevator car, a counterweight, a drive unit arranged below the counterweight and provided with a drive pulley, and an elevator support device, which is guided over the drive pulley and at least one deflecting pulley and which supports and moves the elevator car and the counterweight in opposite directions, at least one run of the support device, which leads to the drive pulley, is led through a cut-out in the counterweight.

Abstract: An elevator comprises an elevator car, a counterweight, a drive and a support, wherein the support couples the elevator car and the counterweight with the drive so that the elevator car and the counterweight are movable in opposite vertical directions by the drive, and wherein the support has a support section at the car side and a support section at the counterweight side. The elevator further comprises a sensor line which is coupled to both the elevator car and the counterweight and which is guided so that in the case of movement of the elevator car and the counterweight in opposite directions it generally remains tensioned by a substantially constant tension stress. The elevator further comprises a sensor which is coupled with the sensor line so that slackening of a support section is detectable by the sensor.

Abstract: An elevator system (20) includes multiple elevator cars (22, 32) within a hoistway (28). A first compensation member (40) is associated with a first counterweight (24). A second compensation member (50) is associated with a second one of the elevator cars (32). Each compensation member has one end that moves with the associated elevator system component and an opposite end (44, 54) secured in a fixed position within the hoistway. In one example, a compensation member has a linear density that is approximately four times a linear density of a corresponding load bearing member.

Abstract: Diverting pulley arrangement, more particularly a diverting pulley arrangement of an elevator, which includes an axle, at least one diverting pulley that rotates while supported on the axle, a faceplate structure, in relation to which and supported by which the diverting pulley is arranged to rotate on the first side of the faceplate structure, which axle is locked so that it does not rotate in relation to the faceplate structure by the aid of a locking element, which locking element is on the second side of the faceplate structure and supported so that it does not move in relation to the faceplate structure. The locking element is placed against the locking surface included in the axle so that the contact point of the locking element and the locking surface of the axle is at least partly visible.

Abstract: An elevator may include an elevator car, a counterweight, a set of hoisting ropes, and one or more rope pulleys. The car and counterweight may be suspended on the hoisting ropes. At least one rope pulley may include a solid surface including a plurality of rope grooves configured to receive at least one hoisting rope. Each rope groove may generally conform to a semi-circular shape and may include a groove bottom and sides. The at least one rope pulley may include a coating adhesively bonded to it. The coating may directly contact the at least one hoisting rope. A coating thickness may be less than or equal to about 3 mm. At the groove bottom of each rope groove, the coating thickness may be substantially less than half a thickness of the at least one hoisting rope. The coating may cover the groove bottom and sides of each rope groove.

Abstract: A method for arranging the reeving of an elevator is provided, which elevator comprises at least an elevator car provided with a car sling comprising an overhead beam, a traction sheave and hoisting roping that passes over the traction sheave, as well as a counterweight and a plurality of diverting pulleys. At least two diverting pulleys are disposed on the roof of the elevator car such that the centers of rotation of the diverting pulleys are above the bottom surface of the overhead beam of the car sling, and the rims of the diverting pulleys are below the bottom surface of the overhead beam of the car sling.

Abstract: Roping method and apparatus for replacing, installing and/or re-roping the hoisting rope of a traction sheave elevator, said elevator having an elevator car, which is at least partially suspended on a set of hoisting ropes, said set of ropes comprising one or more parallel ropes. The elevator car is moved by means of the ropes. In the method, a rope feed apparatus (1) acting on the hoisting rope is used to feed a new rope to the elevator and/or to pull out a possible old hoisting rope to make place for the new rope.

Abstract: An exemplary elevator system comprises a machine support (30) including a first portion (32) situated in a generally horizontal position at least partially within a hoistway (24). A second portion (34) is oriented generally perpendicular to the first portion. The second portion has one end supported by a support surface (52) adjacent the hoistway such that a portion of a load of the machine support is transferred to the support surface. One end of the first portion (32) is supported by the second portion (34) and another end of the first portion is supported by a structural member at least partially in the hoistway such that a remainder of the load of the machine support is transferred to the structural member.

Abstract: An elevator may include an elevator car, counterweight, set of hoisting ropes, and one or more rope pulleys. The elevator car and counterweight may be suspended on the set of hoisting ropes. The one or more rope pulleys may be provided with one or more rope grooves. Each rope groove may have a groove bottom and groove sides. At least one rope pulley may have a coating adhesively bonded to it. At the groove bottom, a thickness of the coating may be at most about 3 mm. At the groove bottom, the thickness of the coating may be substantially less than half a thickness of the at least one hoisting rope running in the one or more rope grooves. At the groove sides, the thickness of the coating may be at most about 3 mm. The coating may be thicker at the groove bottom than at the groove sides.

Abstract: An arrangement for equalizing rope force of an elevator may include: a hoisting machine, set of hoisting ropes, traction sheave, elevator car, guide rails, and compensating device. The hoisting machine may engage the hoisting ropes via the traction sheave. The elevator car may be at least partially supported by the hoisting ropes to move the elevator car. The elevator car may move along the guide rails. The compensating device may include first and second tensioning devices. The first tensioning device may be spaced apart from the second tensioning device. The first and second tensioning devices may be interconnected via a transmission device that transmits rotary motion. A first end of the set of hoisting ropes may be secured to a point in conjunction with the first tensioning device. A second end of the set of hoisting ropes may be secured to a point in conjunction with the second tensioning device.

Abstract: An elevator load bearing assembly (20) includes a plurality of cords (22) within a jacket (24). The jacket has a plurality of grooves (32, 34, 36, 38 40) spaced along the length of the belt assembly. Each groove has a plurality of portions (50, 52, 54, 56) aligned at an oblique angle (A, B) relative to a longitudinal axis (48) of the belt (20). In one example, the grooves are separated such that there is no longitudinal overlap between adjacent grooves. In another example, transitions (60, 64) between the obliquely aligned portions are at different longitudinal positions on the belt. Another example includes a combination of the different longitudinal positions and the non-overlapping groove placement.

Abstract: Provided is an elevator apparatus that may be mounted horizontally in an upper portion of an elevator hoistway. Such an elevator apparatus may comprise a drive machine, a deflector sheave, a support frame, and a roping system. The roping system may be configured to eliminate reverse rope bend to improve the rope life of the system.

Abstract: An exemplary elevator system includes an elevator car (22) having an integrated cabin and car frame structure including a platform thickness (T) between a floor surface in the cabin and a lowermost surface on a support beam used for supporting the car beneath the floor surface. A sheave assembly (26) is supported beneath the floor surface. The sheave assembly includes a plurality of sheaves and a plurality of subframe beams. The sheaves and subframe beams fit within the platform thickness (T) such that the subframe beams and the sheaves are no lower than the lowermost surface on the support beam. A plurality of isolation members are between the sheave assembly and the elevator car for isolating an interior of the cabin from vibrations associated with movement of the sheaves (26).

Abstract: The present invention refers to a configuration of the pulleys and ropes so as to obtain the cage (21) suspension of the size ratio type at least equal to 1:2 or greater (1:4, 1:6, 1:8, etc) and the suspension of a balance weight (14) always equal to 1:2 in size ratio, formed such that the path of the balance weight is equal to the path of the cage. The ropes going from the traction pulley (2) towards the balance weight pass between the pulleys placed on the cage and the pulleys (5, 8) placed in the lower portion of the shaft, such that the portion of the size ratio not obtained between the balance weight and the upper portion of the shaft is realized between the cage and the lower portion of the shaft, so as to equalize on the whole the size ratio between the cage and the upper portion of the shaft. Advantageously, the invention can be provided with segmented dowelling of the pulley races and insertion undercut.

Abstract: A sheave support apparatus for an elevator includes a car frame and a sheave support member. The car frame supports a car, and has a beam extending in a horizontal direction. The sheave support member rotatably supports a pair of sheaves around which cables pass, and is attached to the beam to extend in the horizontal direction in a state of crossing the beam of the car frame. The sheave support member includes a first support beam and a second support beam. The first and the second support beams are fixed to the beam of the car frame in a state of holding the beam therebetween from above and below. The sheaves are supported between respective end portions of the first support beam and respective end portions of the second support beam.

Abstract: An elevator system includes a cab supported for movement within a hoistway. A tension device, which remains close to one end of the hoistway, maintains a desired tension on a load bearing member that supports the cab and moves to achieve a desired placement of the cab. The load bearing member extends from a first end of the hoistway toward the cab, wraps around a first sheave supported on the cab, extends toward the first end of the hoistway, wraps around a second sheave supported near the first end of the hoistway, extends toward a second end of the hoistway, wraps about a third sheave supported near the second end of the hoistway, extends toward the cab, wraps around a fourth sheave supported on the cab, and extends toward the second end of the hoistway where it is secured to the tension device.

Abstract: An elevator system includes a hoistway defined by a surrounding structure. An elevator car and counterweight are located in the hoistway, and a drive motor is located between the elevator car and a sidewall of the hoistway. The drive motor drivingly couples and suspends the elevator car and counterweight via at least one flat rope or belt.

Abstract: An elevator comprises an elevator car and support belts that form a 4:1 suspension for the elevator cabin and that are looped several times beneath the elevator car. Several parallel, flat belts are used and the rollers of at least one fixed roller group that diverts the belts are positioned in such a way that the belt sections of the parallel belts lie vertically above one another in the vicinity of the belt diversion.

Abstract: An elevator may include an elevator car, a plurality of diverting pulleys on the elevator car, one or more hoisting ropes, a traction sheave, and a compensating system. The elevator car may be suspended by the plurality of diverting pulleys on the one or more hoisting ropes. The one or more hoisting ropes may have rope portions going upwards from a first set of the diverting pulleys and downwards from a second set. The rope portions going upwards may be under a first rope tension. The rope portions going downwards may be under a second rope tension. The compensating system may act on the one or more hoisting ropes to perform one or more of equalizing tension, compensating tension, equalizing elongation, and compensating elongation in the one or more hoisting ropes, and keeping a ratio of the first rope tension to the second rope tension substantially constant.

Abstract: An elevator may include an elevator car, two or more diverting pulleys on the elevator car, one or more hoisting ropes, a traction sheave, and a compensating device. The hoisting ropes may include first, second, third, and fourth rope portions. The first rope portions may extend upward from at least one diverting pulley and the second rope portions may extend downward from at least one diverting pulley. The first rope portions may be under a first tension caused by the compensating device acting on the third rope portion and the second rope portions may be under a second tension caused by the compensating device acting on the fourth rope portion. The first tension to the second rope tension may be maintained substantially constant and may be independent of a load of the elevator.