EP0917518B1 - Pulley-driven elevator - Google Patents

Abstract

A traction-sheave elevator is provided without a counterweight. The elevator includes an elevator car that is guided in an elevator shaft. A rope is used to carry the car. The elevator further include at least two motor-driven traction-sheaves that are connected one behind the other relative to the rope. The rope wraps around each traction-sheave to define a relative angle of wrap greater than 180°. A tensioning device is connected downstream of the traction-sheaves for self-adjustably applying a requisite tension to the rope after the rope comes off the second traction-sheave. Additionally, a braking device is provided for at least one of the traction-sheaves.

Description

The invention relates generally to elevators, and more particularly to a traction sheave elevator. which has no mechanical counterweight.

Such a traction sheave elevator is already known from FR-A-2308578.

Different types of lifts for the transportation of people and / or loads are well known and widely used. Lifts can generally be divided into three Subdivide classes, traction sheave or rope lifts, hydraulic lifts and Special solutions, such as Rack, chain or spindle gear lifts. Mixed forms are also known, e.g. a hydraulic rope elevator, which actuated via a piston-cylinder arrangement and intermediate cables becomes.

In the case of traction sheave lifts or rope lifts, a load conveyor, in particular an elevator car hung on a rope, which over a so-called traction sheave is guided. The traction sheave is driven by a motor to move the cabin up or down. At the other end a counterweight is usually arranged on the suspension element or rope, which is usually heavier than the load conveyor. To the load conveyor and moving the counterweight must be sufficient There may be friction between the suspension cable and the traction sheave. The for Rope friction required on the one hand by the design of the Traction sheave, the rope and the number of ropes determined, and on the other by the pressure of the rope against the traction sheave, which in turn of the rope tension and thus of the weight of the load and the Counterweight depends. The counterweight is usually designed so that it is about the weight of the load plus half the maximum load corresponds. Common counterweights are made of steel, reinforced concrete or the like manufactured and require a lot of space in the elevator shaft and on the other hand stable guide rails for spatial fixation. This spatial guidance in the elevator shaft is costly and material-intensive. In particular it is often necessary to use speed limiters and safety gear to provide for the counterweight, which other structural measures with bring with it the required space, costs and material. Furthermore, by the composite high moment of inertia of the load conveyor and the Counterweight greatly affects the response behavior of the elevator.

With the modernization of existing elevator systems or with integration of new elevators in existing buildings, especially old buildings in addition to state requirements, there is often only limited space available.

From DE-PS 105 613 a traction sheave elevator without counterweight is in accordance with the preamble of claim 1 known. In the generic traction sheave elevator a manually adjustable tensioning device acts on you Section of a suspension element. The tension force introduced into the suspension element becomes evenly over pulleys and a self-contained suspension element distributed on the two traction sheaves.

From the magazine Liftreport, Issue 2, 1990, pp. 6-8 is a counterweight Known traction sheave elevator, in which a traction sheave is provided, which in connection with the engine as a tensioning weight at the bottom of the ropes is arranged hanging.

The object of the invention is a generic traction sheave elevator without Develop counterweight with two traction sheaves such that a high Operational safety, in particular a high driving ability is guaranteed, while the elevator is as compact as possible, reduced number of parts as well reduced manufacturing and assembly costs.

This object is achieved by a traction sheave elevator Features of claim 1 solved.

Preferred embodiments are defined in the dependent claims.

In particular, the tensioning device is in the traction sheave elevator according to the invention self-adjusting, i.e. self-acting or self-adjusting at one if necessary, elongation of the suspension element. Furthermore, according to the invention relative wrap angle of the suspension element with respect to each traction sheave greater than 180 °, i.e. that the wrap angle minus any integer multiples of 360 ° is greater than 180 °. Finally, the traction sheave elevator according to the invention via at least one braking device for at least one of the traction sheaves to ensure the operational safety of the elevator further increase. Since the tensioning device the suspension element after the expiry of applied to the second traction sheave, the force applied acts directly as the contact pressure of the suspension element with respect to the traction sheave, so that a total lower voltage of the elevator shaft or the one to be equipped Building can be reached.

The traction sheave elevator preferably has a counterweight, which in one A lift conveyor, a flexible suspension means, is guided, at least two motor-driven traction sheaves and a tensioning device on, which brings a required tension into the suspension element. In particular the load conveyor is an elevator car and the flexible suspension means especially ropes which are wound one after the other around the two traction sheaves are. By providing two traction sheaves in combination with the downstream suspension means is the static friction generated between the suspension element and the traction sheaves are greater than the weight of the maximum loaded load conveyor, which leads to the use of a voluminous and heavy counterweight can be dispensed with, the permissible load limits of the suspension element and the traction sheave, in particular the traction sheave groove must not be exceeded. By dropping out of the counterweight advantageously increases the risk of falling Eliminated elevator, which with conventional traction sheave lifts particularly resulting from the fact that the counterweight is usually is heavier than the load conveyor.

The elevator according to the invention enables a very compact construction, whereby in particular, all components are housed in the elevator shaft itself can be.

The required rope tension can be achieved using one provided at one end of the rope Tensioning means are provided, e.g. a hydraulic or pneumatic Clamping device, which e.g. mounted on the bottom of the elevator shaft can be. However, the required voltage of the Suspended means reached via a force-deflection pulley, the Power-operated deflection pulley can also serve the wrap angle of the suspension element around the traction sheaves.

In a preferred embodiment of the traction sheave elevator according to the invention one end of the suspension means is connected to the load conveyor. Thus, each section of the suspension element moves at the same speed moves like the load conveyor. The attachment of the ends of the Suspension means formed in one piece for both ends, i.e. that in particular preferably the suspension means forms a closed loop. Alternatively, you can separate locations are also provided for the two ends of the suspension element be, in particular these can be offset from one another, if necessary to compensate for a shifted focus. With offset attachment the ends of the suspension element on the load handling equipment should be designed for it care is taken that the upward-running end of the suspension means in attached substantially above the center of gravity of the load conveyor becomes.

Alternatively, it is preferred that one end of the suspension element at the bottom and is attached to the upper end of the elevator shaft, creating a stationary Suspension means is formed. This arrangement is particularly advantageous because there is little Suspension material is required. Furthermore, with this arrangement, the complete Drive device, possibly including the elevator control, attached to the load conveyor, i.e. all moving parts can are located on the load conveyor and are therefore easy to install and close wait, with neither a machine room at the top nor at the bottom the like is needed to accommodate the elevator machinery.

The traction sheave elevator preferably has at least one further deflection sheave on the one hand, to ensure better symmetry of the suspension element course, and on the other hand the wrap angle of the traction sheaves increase. A deflection roller is particularly preferred on the load conveyor provided to suspend the load conveyor indirectly or in the manner of a block and tackle, so that the force caused by the load conveyor halves to two each above-extending suspension element sections is distributed. This pulley is preferred as a freewheel deflection roller and / or a double deflection counter roller formed, these having the same or possibly different radii can have. By providing such a deflection roller on the load conveyor it is possible to measure the dimensions and designs of the rest To reduce components, especially for the drive device sufficient, in fact at double speed or double driving ability to provide only half the drive torque.

The traction sheaves of the elevator can be driven by a common motor using a suitable gearbox, possibly with a clutch for the two traction sheaves, but it is preferred that each of the traction sheaves be driven by its own motor becomes. In particular, electric motors, hydraulic motors and the like are used. In particular, there is currently a hydraulic motor preferred, which enables the most silent possible operation by the absence of a transmission device. The engine can too serve as a braking device and in this case is preferably with a memory connected to the braking energy generated during the lowering of the load conveyor save for later lifting. Thus the engine acts as Braking device in the manner of a generator, the energy generated can be partially stored in a suitable memory, such as Example of a pressure or hydraulic accumulator in the case of a hydraulic motor, however, for example in the case of an electric motor, also a battery or others suitable storage means can be used. Thus one can Provide more energy-efficient elevator, which apart from the efficiency from the memory losses and / or from the required drive power, in corresponds essentially to an elevator with counterweight, but without the Disadvantages, especially the space requirements of a counterweight elevator to show.

The suspension element-exciting deflection disk is preferred over a weight-provided one Lever mechanism, a hydraulic device, a pneumatic Device or powered by an electric motor. Depending on the requirements the application of force can thus be controlled or adjusted, whereby also compensated for a suspension expansion caused by material fatigue can be. In a particularly advantageous manner, the traction sheaves and the suspension element tensioning device is thus also spatially separated from one another be attached. It is further preferred that the in the suspension means generated voltage, i.e. that in particular the exciting on the suspension means Deflection force acting on the load of the load conveyor is. For this purpose, a weight detection device is in or on Load conveying means are provided, which are mechanical, electrical or otherwise is connected to a control device, which in turn has the required suspension element tension determined and this via the tensioning device in the suspension element brings in.

The traction sheave elevator is preferably provided with a suspension element tension detection device provided which falls below a predetermined Carrier tension activated a safety device. In particular, at Relief of the suspension medium tension arrests the movement of the load conveyor, e.g. through pawls provided in the guidance of the load conveyor or Detents, which are activated as a safety device immediately when the Carrier tension has dropped below a predetermined value.

The propellant-exciting device is preferably on the floor of the elevator shaft intended.

The traction sheaves of the traction sheave elevator are preferably fixed in the upper one Section or above the upper section, in a dedicated machine room arranged, but can also be at the bottom or below of the elevator shaft can be installed if the spatial conditions request this accordingly.

The suspension device exciting device and / or the traction sheaves can also attached to the load conveyor itself, i.e. move with this. In particular can transform the individual panes into a suspension element Drive unit can be combined, which as a whole on the load conveyor is attached. By such an arrangement of the traction sheaves and / or Clamping device, the space required can be further reduced. Furthermore, the elevator shaft height in such an embodiment be optimally used.

The suspension element preferably rotates with the traction sheaves one after the other a wrap angle of 180 °, which is preferably up to 270 °. This high wrap angle ensures that even at heavily loaded load handling equipment ensures starting and braking without the suspension element sliding with respect to the traction sheaves, even at high speeds. Thus a quick response of the Elevator machinery guaranteed.

The motor drive of the traction sheaves can also act as a braking device may be used, but it is preferred that for at least one of the traction sheaves a separate braking device is provided to control the movement of the Traction sheave, and thus that driven by the traction sheave and the suspension element Braking the load conveyor, and in particular its position to back up.

Finally, it is preferred that the tensioning device, the traction sheaves and the suspension means are arranged in a plane, which is next to and / or behind the load conveyor is arranged. So it is neither below nor above the exploitable shaft height space required, so that an even more compact Design of the elevator according to the invention is made possible.

Further features and advantages of the traction sheave elevator according to the invention emerge from the detailed description below of some preferred ones Embodiments which are exemplary only and are non-limiting is to be viewed, and is made with reference to the accompanying drawing.

Figure 1 shows a longitudinal sectional view of an elevator shaft, in which a preferred traction sheave elevator is arranged according to the invention.

Figure 2 shows a view similar to Figure 1, but above the Elevator shaft a machine room is provided, and in the machine room and the elevator shaft an alternative embodiment of the invention Traction sheave elevator is mounted.

FIGS. 3A and 3B show cross-sectional views through the one in FIG. 1 and in FIG Figure 2 shown shaft, wherein Figure 3A shows the details of the motor-driven Traction sheaves and Figure 3B shows details of the tensioning device.

Figure 4 is a longitudinal sectional view similar to Figure 1, but with an alternative Embodiment of the traction sheave elevator according to the invention mounted is.

Figure 5 is another longitudinal sectional view similar to Figure 1 of another preferred embodiment according to the invention, in particular a offset center of gravity is taken into account.

Figure 6 shows a particular application of a preferred embodiment of the traction sheave elevator according to the present invention.

FIGS. 7A and 7B show a further longitudinal sectional view of an elevator shaft with two further preferred embodiments of the traction sheave elevator mounted in it.

Figure 8 shows a further longitudinal sectional view of an elevator shaft with still a further preferred embodiment of the traction sheave elevator therein assembled.

1 shows an elevator shaft 1 formed from walls 2 without a machine room shown. In the shaft 1 is a frame-shaped scaffold construction 3 mounted, which two guide rails 4, several brackets 5 and two cross members 6 and 7. The cross members 6 and 7 are essentially in the upper and lower end of the shaft 1 embedded in the walls 2 or to the Guide rails mounted, and extend substantially over the entire shaft width. Extend between the cross beams 6 and 7 Guide rails 4, which are a load conveyor, in the embodiment shown guide an elevator car 12 to move up and down. The elevator car 12 is connected at 16 to one end of a suspension element 15. In the embodiment shown, the suspension element 15 is formed from three steel cables, which at the attachment point at a short distance relative to each other the elevator car are attached. Starting from the elevator car 12 extends the suspension element 15 is essentially perpendicular to one first traction sheave 8, which is driven by an electric motor 10. The Suspension means 15 wraps around the traction sheave 8 and is continued via a Deflection pulley 13 to a second traction sheave 9 with a second driving Electric motor 11. Starting from the second traction sheave 9, the Support means 15 guided downwards via a further deflection disk 14. In the The embodiment shown are the traction sheaves 8, 9 and the deflection sheaves 13, 14 mounted on the upper cross member 6 via a frame construction. After the second deflection disk 14, the suspension element 15 runs essentially perpendicular downwards to a clamping device 17. In the embodiment shown The tensioning device 17 comprises a deflection disk 18, which over a lever mechanism is loaded with a weight 19. The Suspension means 15 is wound around the deflection plate 18, and is with the other end also attached to the elevator car 12. In the embodiment shown the second end is attached to the elevator car 12 via a trigger spring mechanism 22, which e.g. if one of the Ropes activated a fall arrester, which prevents the elevator car 12 is moved when failure of one of the suspension cables is present.

The embodiment shown in FIG. 2 is generally similar to that in FIG. 1 shown, and the description of the same constituents is used herein for the purpose left out of the shortage. In the embodiment shown in Figure 2 is, the traction sheaves 8, 9 with the associated motors 10, 11 and Deflection disks 13 and 14 in a located above the elevator shaft Engine room housed. Furthermore, in the embodiment shown in Figure 2 the suspension device 17 via a hydraulic or pneumatic cylinder 20 is pressurized. Especially with a hydraulic or pneumatically controlled clamping device can be a load-dependent Rope tension achieved in a simple manner via a control, not shown become.

From the cross-sectional views of Figures 3A and 3B it follows that the Suspension means 15, the traction sheaves 8, 9 and the tensioning device 17 essentially are mounted next to the elevator car 12 in or on the elevator shaft 1, leaving enough space for the elevator car 12, and not from a falling traction sheave or deflection sheave can be hit. FIGS. 3A and 3B also show that the traction sheaves 8, 9 and the deflection pulley 18 of the tensioning device 17 for guiding several ropes are designed, which together form the suspension element 15. With one in particular preferred embodiment, not shown, comprises the tensioning device in each case a single, mounted washer for one rope of the suspension element, so that each component of the suspension means taken on a specific basis Rope tension can be brought, whereby the production tolerances at the Production of suspension elements can be plugged coarser.

3A and 3B is an electric motor 11 replaced by a hydraulic motor 11, furthermore for the traction sheave 9 a braking device 30 is provided. Furthermore, the tensioning device here with a weight 19 as well as with a pneumatic or hydraulic clamping cylinder 20 shown.

In the embodiment shown in Figure 4, the traction sheaves 8, 9 are mounted lower end of the elevator shaft 1, while at the upper end of the Only another free idler pulley 25 is provided in the elevator shaft is. In the embodiment shown, one of the deflection disks 13, 14 as a force-actuated deflection disk 18 of the tensioning device 17 educated. In the embodiment shown, the deflection disk is used in particular 13 on the one hand to increase the degree of wrap of the traction sheave 8 increase. The deflection disk 18 brings about the cylinder / piston device 20 a corresponding tension in the suspension element 15. Of course could the drive deflection and suspension device arrangement also in one Shaft pit below the elevator shaft (not shown).

5 shows a modified embodiment in which the Suspension means 15 is attached to the elevator car 12 at different locations. One end of the suspension element 15 is essentially in the middle at the upper end of the Elevator car 12 attached. The elevator car will be as in the previous ones Embodiments via a guide rail 4 within the elevator shaft 1 led. Since the elevator car 12 has a door on one side is provided, is the center of gravity of the elevator car 12 with respect to the central axis slightly shifted. Starting from the suspension point of the elevator car the suspension element 15 extends perpendicularly upwards to the first Traction sheave 8, wrapped around it with a wrap angle of about 260 °, then following the shape of a question mark the second traction sheave 9, also to be wrapped with a wrap angle of about 260 °, after which the suspension element 15 is guided upwards to a deflection disk 13. The two traction sheaves 8, 9 are driven by the motors 10, 11 in accordance with the View driven in reverse. Starting from the deflection disc 13 the suspension element is further vertical via a deflection disk 14 led down to the deflecting tensioning device 17, which is shown in FIG Embodiment comprising a pneumatic cylinder 19 and a deflection disk 18 is formed. Starting from the deflection plate 18, the suspension element 15 becomes wider continued to the elevator car 12. The attachment of the second end of the Suspension means 15 takes place via a suspension means tension detection device 22, the end being mounted on the elevator cage such that the displacement of the Center of gravity balanced by the downward force of the suspension element becomes.

FIG. 6 shows a special application of a preferred traction sheave elevator shown, which itself used to assemble the elevator scaffold can be. For this purpose, the traction sheave deflection device, e.g. by doing Machine room mounted above the elevator shaft. Below is on Bottom of the elevator shaft mounted the tensioning device, after which in simple Way the suspension element is arranged around the individual disks can be finally biased via the tensioning device become. In this application in particular, it is advantageous that none is difficult There are counterweights to be guided, since the guide rails in the Elevator shaft gradually with upward movement of the elevator itself can be designed and constructed. Thus, the system can already Construction stage can be used as an assembly elevator, creating a significant Cost reduction can be achieved. In particular, the basic framework of the Load conveyor designed in such a way that a device is attached to it can be, with which it is possible, rail sections lying higher to set up the construction progress without the usual, push the necessary assembly platforms. Too high a procedure of the frame, i.e. jumping out of the already installed guide rails to exclude corresponding sensors, not shown, as well a mechanical safety device is provided which detects the lifting movement interrupt immediately as soon as the previously installed rail end is reached.

Figures 7A and 7B show two further preferred embodiments, at which the suspension means firmly between the upper and the lower elevator shaft end is clamped. In the embodiment shown in Figure 7A (left half) is the suspension element 15 at the upper end of the elevator shaft 1, attached in particular to the cross member 6, extends downward from there to a first, motor-driven traction sheave 8, and from this to the second traction sheave 9, the support means 15, the traction sheaves 8, 9 in one essentially wraps around an S-shape, so that each wrap angle of about 250 ° is reached. In the embodiment shown, the traction sheaves are 8, 9 fixed, but of course rotatably connected to the elevator car 12. From the second traction sheave 9, the suspension element 15 follows vertically below to a tensioning device also mounted on the elevator car 12 17, which in turn consists of a deflection plate, a lever and a hydraulic cylinder 20 is formed. Especially with this configuration load-dependent rope tensioning can be achieved particularly easily. In the embodiment shown is below the tension force generating Cylinder 20 provided a suspension element tension detection device 34, which responds if the suspension element fails. Starting from the pressurized Deflection plate 18, the suspension element 15 is further via an additional Deflection pulley 13 out of which the suspension element to the lower frame element 7 is guided, which is at the lower end of the elevator shaft located. In the embodiment of Figure 7B (right half) are also the traction sheaves 8, 9 rotatable, but firmly on the elevator car assembled. However, in the embodiment shown, the rope tensioning device 17 provided as a separate device at the bottom of the elevator shaft, wherein in the embodiment shown, the tensioning device 17 is directly on the suspension means acting hydraulic or pneumatic tensioning device 17 is. In the embodiment shown, this clamping device also includes the Suspension means voltage detection device 34, which with the elevator control (not shown).

Figure 8 finally shows yet another preferred embodiment, at which also has one end of the suspension element at the upper end of the elevator shaft is set. The other end of the suspension element is shown in the Embodiment above a mounted on the bottom of the elevator shaft Housing attached, which holds traction sheaves, tensioning device etc. serves. Although not shown, it is also possible the other Attach the end of the suspension element directly to the bottom of the elevator shaft 1. The traction sheave arrangement and the tensioning device correspond in essential of the embodiment shown in Figure 4. In the embodiment shown the motor 10 is provided as a hydraulic motor, which via Lines 130 is connected to a valve housing 125. The valve housing is connected to a drive unit 110, which a pump 115 and includes an electric motor 120. There is also a pressure accumulator on the valve housing 125 135 connected, which with appropriate valve switching Hydromotor 10 supplied, or is fed by this. The specialist will recognize that other drive and storage means, such as for example an electric motor used in combination with a battery can be. Thus, when the load conveyor 12 descends, the Suspension means 15 drive the hydraulic motor 10 under braking, so that it the pressure generated via the lines 130 and the valve housing 125 to the Memory 135 feeds. During a later lifting process, the data can be stored in the memory 135 stored energy again to the hydraulic motor 10 via the valve housing 125 are supplied to relieve the drive unit 110.

Furthermore, a deflection device 104 is on in the embodiment shown the load conveyor provided. It is in the embodiment shown a double counter-rotating pulley or two oppositely provided Deflection rollers, which in the embodiment shown have the same diameter have and are mounted on only one shaft, but this is not mandatory. The suspension element 15 extends from the Attachment point at the top of the elevator shaft down to this Deflection roller 104 is deflected from there upwards to the deflection plate 25 and is continued from there down to the traction sheaves. After the wrap of the two traction sheaves 8 and 9, the suspension element becomes a self-tensioning device 17 led to be continued from there up again to the part of the deflection device 104 provided in the opposite direction, in order to be there to be redirected again to the attachment point at the bottom of the Elevator shaft. The load handling equipment becomes the load-carrying means through the suspension means guide provided in this way 12 suspended indirectly or in the manner of a pulley, so that the weight force on the respective upward running suspension sections each divided in half. Thus, the other units, such as for example design the traction sheaves and the motor accordingly weaker, with the engine, in particular, that with double throughput or at double speed only half the drive torque is required. Regarding the other features of this embodiment, reference is made to the previous ones Embodiments referenced.

Although some specific embodiments of the present invention are described in above, it will be apparent to one of ordinary skill in the art that various arrangements of the traction sheaves, deflection sheaves and the clamping device are possible, which, however, on the same according to the invention Concept based. In summary, with the invention Design of the traction sheave elevator a compact elevator realize that can be used even in tight spaces, which is due to a lack of counterweight and the pre-assembled Carrier module as drive unit greatly reduced installation effort distinguished, in the case of a fall due to the lack of counterweight above with understaffed cabin is excluded, and which one has a significantly higher level of security than previous traction sheave lifts. If necessary, the drive can be installed inside the shaft integration into old buildings without major structural measures is possible.

Claims (15)

1. Traction-sheave elevator without counterweight, which is guided in an elevator shaft (1), comprising a load-conveying means (12), in particular an elevator car, a flexible carrying means (15), in particular ropes, at least two motor-driven traction sheaves (8, 9) connected one behind the other relative to the carrying means, and a tensioning device (17), which introduces a requisite tension into the carrying means (15) and is connected downstream of the two traction sheaves.
2. Traction-sheave elevator according to Claim 1, in which the tensioning device (17) has a deflection sheave (18) to which force is applied.
3. Traction-sheave elevator according to Claim 1 or 2, in which in each case an end of the carrying means (15) is connected to the load-conveying means (12).
4. Traction-sheave elevator according to Claim 1 or 2, in which in each case an end of the carrying means (15) is fastened to the bottom of the elevator shaft (1) and to the top end of the elevator shaft (1).
5. Traction-sheave elevator according to one of the preceding claims, in which at least one further deflection sheave (13, 14, 104) is provided, in particular a deflection pulley (104) secured to the load-conveying means and intended for suspending the load-conveying means, preferably provided as a freewheeling deflection pulley and/or as a double deflection contrarotating pulley.
6. Traction-sheave elevator according to one of the preceding claims, in which each traction sheave (8, 9) is driven via a separate motor (10, 11, 11'), in particular an electric motor (10, 11) or hydraulic motor (11'), in particular also serving as braking device, which if need be is connected to an accumulator so that the braking energy produced during the lowering travel of the load-conveying means is stored for a subsequent elevating operation.
7. Traction-sheave elevator as claimed in one of Claims 2 to 6, in which force is applied to the carrying-means-tensioning deflection sheave (18) via a lever mechanism (19) provided with a weight, via a hydraulic device (20), a pneumatic device or via an electric motor.
8. Traction-sheave elevator as claimed in one of Claims 2 to 6, in which the force acting on the carrying-means-tensioning deflection sheave (18) is a function of the useful load of the load-conveying means (12).
9. Traction-sheave elevator as claimed in one of the preceding claims, in which a carrying-means-tension-detection device (22, 34), which activates a safety device if the carrying-means tension falls below a predetermined value, is provided.
10. Traction-sheave elevator as claimed in one of the preceding claims, in which the carrying-means-tensioning device (17) is provided at the bottom of the elevator shaft (1).
11. Traction-sheave elevator as claimed in one of the preceding claims, in which the traction sheaves (8, 9) are firmly installed in the top/bottom section or above the top or below the bottom end of the elevator shaft (1).
12. Traction-sheave elevator as claimed in one of the preceding claims, in which the traction sheaves (8, 9) and/or the carrying-means-tensioning device (17) are/is attached to the load-conveying means (12), i.e. move or moves with the load-conveying means (12).
13. Traction-sheave elevator as claimed in one of the preceding claims, in which the angle of wrap of the carrying means (15) around each traction sheave (8, 9) is > 180°, and in particular is up to 270°.
14. Traction-sheave elevator as claimed in one of the preceding claims, in which a braking device is also provided for at least one of the traction sheaves (8, 9).
15. Traction-sheave elevator as claimed in one of the preceding claims, in which the tensioning device (17), the traction sheaves (8, 9) and the carrying means (15) extend in one plane, which is arranged next to and/or behind the load-conveying means (12).

Images