WO2008095324A1

WO2008095324A1 - Drive for a elevator car that can be serviced from said elevator car

Info

Publication number: WO2008095324A1
Application number: PCT/CH2008/000036
Authority: WO
Inventors: Markus Henseler
Original assignee: H. Henseler Ag
Priority date: 2007-02-06
Filing date: 2008-02-01
Publication date: 2008-08-14
Also published as: EP2114810B1; DE502008002280D1; EP2114810A1; PT2114810E; ATE495130T1; PL2114810T3; HRP20110155T1; CH700929B1; ES2358463T3

Abstract

The invention relates to a drive for an elevator car and to its counterweight. Said drive is a gearless traction drive comprising a stationary stator and an external, rotating drive cylinder (26) that is equipped with permanent magnets on the inside. Drive cables (41, 42) for the elevator car and the counterweight are guided in the cable grooves (8) on said drive cylinder (26). Said traction drive is suspended on a bridge (25) that is secured to the vertical guide rails (23,24) for the elevator car and the counterweight.

Description

From the elevator cabin serviceable drive for a lift cabin

This invention relates to a drive for a lift cabin, which is guided in a lift shaft along vertical rails. As a special feature, the drive can be maintained from the lift cabin. The drive unit is arranged laterally in an upper region of the shaft space, wherein the cabin is partially passable by this drive, so that the lowest possible shaft head height and at the same time a minimum shaft space cross section are necessary.

Conventionally, many lift drives are arranged in the upper end of the elevator shaft. To maintain these lift drives, a lift fitter must climb onto the cabin roof of the lift cabin to gain access to the lift drive. This is basically dangerous, and even some fitter have been injured in the past when performing such checks and maintenance between the elevator car and the shaft ceiling or even killed by crushing. Therefore, the legislature has issued strict guidelines that are to make crushing impossible.

As a central rule, the danger of crushing in the end positions of the elevator car with open spaces or protective niches must be avoided in new elevators. Due to the wording of point 2.2. in the Elevator Regulation and the EC Elevator Directive this means that for the Legislator the optimum safety is achieved with a mandatory shelter. The shaft head, the shaft pit and the shelter are defined by the harmonized standards SN EN 81-1 / 2: 1998. According to this, in point 5.7.1, it is said to be the upper shelter of traction sheave lifts under d): The space above the cabin must be able to accommodate a cuboid lying on one of its sides with minimum dimensions of 0.5mx 0.6mx 0.8m, permanently. An additional free space can be created with temporary measures, for example by using supports, if it is ensured that the lift shaft is only accessible if these measures are taken and thus this space is created. The height of this additional free space with footprint 0.48mx 0.25m depends on the maximum speed of the lift cabin and is calculated in meters to 1 + 0.035 xv ² , where v is used in [m / s]. These regulations apply and must be complied with even if it is not necessary at all to climb onto the cabin roof to maintain the lift.

So far, however, it was hardly necessary to avoid committing the elevator car (cabin roof). Most lift drives are located in the upper end of the lift shaft head and therefore the lift cabin (cabin roof) must be accessible to carry out the maintenance work. The situation is different with a lift construction in which the upper end of the shaft head remains completely free. From the architecture comes the increasing desire to be able to do without unsightly light shaft heads on the buildings. However, this presents the lift manufacturers with new challenges, precisely because with every construction, the applicable lift regulations must be met. Latest lift drive designs allow a minimum shaft head height of just 280cm. This is the measure of the top floor floor up to the bottom of the lift shaft head, that is to the ceiling of the elevator shaft. For example, a lift to be installed has a cabin of 220cm inside height. Approximately 10cm are needed for crossing above the cabin. For the lift door drive, it also requires certain height. This leaves only 50cm left in the top normal lift position. These are needed as a safety buffer. If the lift with heavy load on the top floor stops, exactly at floor level, and is then relieved, so the cabin can still raise by a few cm due to the elasticity of the suspension ropes. Even then there must still be a gap wide air up to the lift shaft head, so that in no case can strike the elevator car at the same. In this constellation with elevator cabin height of 220cm plus the minimum height of the lying prescribed cuboid of 0.5Om ₁ which means 220cm + 50cm + 10cm crossing, this headroom height of 280cm results straight. There is a desire to further reduce this measure of the shaft head, because the usual floor height in residential buildings is 240cm. Then comes the concrete ceiling and possibly the flat roof construction above. With lift shaft heads of 280cm from the top floor you are in many cases still higher than the corresponding roof construction, so that the lift head always protrudes high out of the roof. But that is exactly what should be avoided. In addition, it should be sought with a new drive design to be able to carry out all maintenance, if possible, from the elevator car out.

Another disadvantage of conventional drives for lift cabins is the fact that it works with electric motors, transmissions and pulleys or traction sheaves. Due to the design, it is not possible in many cases to achieve a good mass balance. This then makes it necessary that the drive structures must be very strongly connected to the lift shaft, so that the reaction forces occurring can be absorbed.

The object of the present invention is therefore to provide a drive for a lift cabin, which requires a minimum elevator head height at a certain elevator car height and which makes it possible to perform all of the driven by him lift maintenance, inspection and maintenance work Inside of the lift cabin. The drive should also take up a minimal space between the outside of the elevator car and the shaft wall and provide an optimal weight distribution between the elevator car and its payload and the counterweight, so that hardly more forces act on the shaft wall on which the drive structure attached and secured.

This object is achieved by a drive for a lift cabin and their

Counterweight, which are each guided on a pair of vertical guide rails, and which is characterized in that the drive gearless

Traction drive with stationary stator and external, rotating and inside with

Permanent magnet fitted typhoon is over which the drive cables for the elevator car and the counterweight are guided in rope grooves, and which

Traction drive is mounted hanging on a bridge, which is attached to the vertical guide rails for the elevator car and the counterweight.

Based on the drawings, this drive is shown and described his attachment to the guide rails of a lift cabin and a counterweight in a lift shaft and described. The function of this drive and its peculiarities are explained and explained.

It shows:

Figure 1: A conventional drive with electric motor, gearbox and pulley;

Figure 2: This conventional drive when performing maintenance;

Figure 3: another conventional drive with electric motor, gear and pulley;

Figure 4: The traction drive according to the invention with a driving tube in a drive on the wall of the elevator shaft with the guide rails attached thereto and the mounting bridge for the traction drive;

Figure 5: A view of the wall of the elevator shaft with the guide rails attached thereto and the traction drive with drive pipe when the Lift cabin with open wall part is at the height of the drive;

Figure 6: A view of the elevator shaft seen from above, viewed from below the drive against downwards on the pulleys for the counterweight and the elevator car landing;

Figure 7: A view of the elevator shaft seen from above, with the traction drive with driving tube without mounting bridge, illustrating its mounting position with respect to the two guide rail pairs;

Figure 8: A perspective view of the traction drive with drive tube and mounting bridge and the guide rails on which this mounting bridge is mounted;

Figure 9: A schematic representation of the cable guide to this drive with suspended traction drive and associated drive tube;

Figure 10: The view into a lift cabin with maintenance window, which is driven by this traction drive;

FIG. 11 shows the view into this elevator cabin with the maintenance window open and the cables outside the maintenance window;

Figure 12: A schematic representation of the elevator car wall, the parapet formed and the safety device for the process of the elevator car with the maintenance window open;

Figure 13: A schematic representation of the elevator car wall, the parapet formed and an alternative safety device for the

Lift cabin procedure with the maintenance window open;

Figure 14: A longitudinal section through the elevator cabin seen from the side in the highest position in the lift shaft, with closed maintenance window;

Figure 15: A longitudinal section through the elevator car seen from the side in the uppermost position in the elevator shaft, with open maintenance window and parapet created.

Figure 1 shows a first conventional drive with electric motor 50, gear and pulley 51 to show the general problem. Here, the elevator car 52 is guided with its pedestal 53 to two guide rails 54, and the counterweight 55 on two just such, staggered guide rails 56. On the ropes 57, the counterweight 55 and the elevator car 52 depends directly, without further reduction. This also makes a gear needed, which is flanged to the electric motor 50 and is needed to adjust the rotational speed of the pulley 51 accordingly, which would otherwise run much too fast.

As can be seen with reference to Figure 2, in such a conventional arrangement of the lift motor 50 with a geared-down driven pulley 51, the maintenance work necessarily be performed from the canopy. The lift mechanic stands on the cabin roof. On this cabin roof a free space F of 0.5m x 0.6m x 0.8m must always be present, for example as drawn. The cuboid with the dimensions 0.5m x 0.6m x 0.8m, however, may be on a different side. Even if the lift motor 50 and all other drive elements were arranged at the bottom in the lift shaft, then this marked clearance F would have to be present. The elevator cab could therefore not be driven with its canopy all the way to the end of the elevator shaft head.

FIG. 3 shows another conventional drive construction. In this construction, the lift motor 50 is located farther down, not directly above the cross section of the elevator car, but approximately at the level of the upper cabin edge when the car is in its uppermost position as shown here located. However, the lift engine still has to be maintained from the outside - it is not accessible from inside the cab. Here, too, a free space F of 0.5mx 0.6mx 0.8m must always be present on the cabin roof, whereby this can for example be as shown. However, the cuboid 0.5mx 0.6mx 0.8m can be on another side.

In Figure 4, the new drive is shown. It is a view of the wall 7 of the elevator shaft with the attached guide rails 23,24 for the elevator car and the counterweight and the now gearless traction drive with drive pipe 26. The special feature of this traction drive is that it is a gearless drive with stationary stator and outer, rotating and internally fitted with permanent magnets propellant tube 26, over which the drive cables for the elevator car and the counterweight are guided in cable grooves 8, and which traction drive is mounted suspended on a bridge 25 which on the vertical guide rails 23,24 is attached for the lift cabin and the counterweight. This traction drive has a drive tube 26 with at least 240mm Außendruchmesser, and brings a power of at least 2.4 kW and a torque of at least 295 Nm, with stronger versions are used, with much more power and torque.

Figure 5 shows the same, but now with the elevator car 1 and their doors 18 and pedestal or elevator car floor 36 when the elevator car 1 is stopped at the height of the traction drive, and this traction drive is accessible through their own open maintenance window , As a special feature, this traction drive is suspended on a bridge 25, which rest on C-shaped frame members 27 on the inner guide rails 23 for the counterweight, while these frame members 27 are laterally attached to the outer guide rails 24 for the elevator car. The maintenance window in the elevator cabin is open except for the lower, for example 90 cm high side wall part 6. It extends virtually over the entire width of the elevator car 1. Before this maintenance window, the removable side wall part 3 is placed on the elevator car floor, so the pedestal 36, so that its upper edge 4, the lower Side wall part 6 surmounted by 10 cm and forms a parapet 4. In the figure, one recognizes the rails 23 for the guidance of the counterweight, and arranged outside the motor parallel to the rails 24 for the guidance of the elevator car 1. Furthermore, it can be seen here that the mounting bridge 25 at this uppermost position of the elevator car 1 below its upper edge is located. Therefore, the entire drive through the maintenance window from the interior of the elevator car 1 is accessible, and the elevator car 1 can be driven with open maintenance window off and on.

Figure 6 shows a view of the lift shaft seen from above, seen from below the drive down. Here you can see the lift cabin from above on the pedestal 36 and left and right the lift doors. The view falls on the sheaves 29, the counterweight 30 and on the sheaves 28 for the elevator car landing stage 26. The counterweight 30 is disposed between the inner guide rails 23 and its sheaves 29 are designed as loose rollers, at the pivot pin 11, the counterweight 30th hangs. At the axle 10 of the pulleys 28 for the elevator car on the other hand rests the pedestal 36 for the elevator car by these axles 10 lead into the interior of the elevator car pedestal 36.

Figure 7 shows this lift shaft seen from above, with the traction drive with drive tube 26 without mounting bridge, to illustrate the position of the drive tube 26 with respect to the two guide rail pairs 23,24. As can be seen, the axis of rotation 37 of the drive tube 26 runs exactly between the two planes 38, 39, which are formed by the two guide rail pairs 23 and 24. This arrangement of the drive tube 26 an excellent mass balance is achieved, so that the forces acting on the suspension of the traction drive on the guide rails torques and forces remain minimal and also hardly significant forces on the attachment of the guide rails 23,24 act on the lift shaft wall 7.

Figure 8 shows a perspective view of the traction drive with its driving tube 26, which is shown here by dashed lines, because it mounted on Drive is covered by a cover plate 40. It can be seen the mounting bridge 25 and the guide rails 23,24, to which this mounting bracket 25 is mounted. A first pair of parallel guide rails 23 is provided for the guidance of the counterweight, and parallel to the plane between these two guide rails 23, a further pair of parallel guide rails 24 is arranged at a greater distance from each other, on which the elevator car is guided. The guide rails 24 are screwed via square sections 34 and an end flange 35 with the wall 7 of the elevator shaft. In the same way, the inner guide rails 23 are connected to the wall 7. The traction drive tube 26 extends horizontally and parallel to the two planes between the guide rails 23 and 24 of the two pairs of vertical guide rails. The inner pair of vertical guide rails 23, on which the counterweight is guided, is closer to the shaft wall 7 than the guide rails 24 of the other pair of guide rails, on which the elevator car is guided. The bridge 25, together with two frame members 27, each consisting of a bent to a C-shape steel plate, a frame. The open side of the two C-shaped frame members 27 are arranged opposite to each other, wherein the lower, horizontally extending legs 33 of the C-shape resting on the upper ends of the inner guide rails 23, while the upper, horizontally extending legs 32 of the C-shape a profile resting on these legs 32 are connected and screwed so that it forms a bridge 25. The vertically extending portions of the C-shaped frame members 27 are clamped by means of clamping elements 31, so-called frogs, with the outside on them outer guide rails 24. FIG. 8 shows the cables 41, 42 guided over the driving tube 26. For the clean guidance of these cables, the driving tube 26 is equipped with rope grooves 8. There are six ropes, that is on each side of the drive tube 26 results in 2 x three ropes 41, 42, which lead down. The here front ropes 42 lead further down to loose roles whose axles 10 carry the elevator car platform 36, and the rear six ropes 41 lead to loose roles, the axle bolts carry the counterweight. Figure 9 shows a schematic representation of this cable guide. From the driving tube 26, the six ropes 42 on the side facing the elevator car and its pedestal 36 initially lead vertically downwards, and then they are guided around the pulleys 28, whose axle bolts 10 protrude into the pedestal 36 of the elevator car and thus wear the same. Of the total of six ropes 42, three are wound around one pulley 28 and the other three ropes are passed around the adjacent pulley 28. On the outer sides of these two sheaves 28, the ropes 42 lead back up and are finally attached to the frame in which hangs the traction drive. For the rope attachment, the lower leg 33 offer the C-shaped frame members 27 at. There, the rope ends are bolted and secured with locknuts. Because there are three ropes each 42, the sheaves 28 corresponding to three adjacent rope grooves. The ropes 41, which lead to the wall side of the driving tube 26 down, so here the viewer of the figure facing ropes 41, down and there in the same way to two sheaves 29. Their axle 11 are connected to a counterweight 30, the depends on this axle 11. On the other side of the pulleys 29, so here on the outer sides, lead the ropes 41 back up and are also attached to the lower legs 33 of the C-shaped frame members 27.

In Figure 10, a view is granted in the open and driven by this system elevator car, seen from the access door. Here the lift cabin is shown ready for use. The side walls are formed by panels 3, 6, 15, which are held, for example, by lateral guide rails 14, which in turn are connected to the frame of the elevator cabin by plug-in or screw connections. A fuse strip 16 may for example be arranged horizontally along the top of the cabin roof. This is equipped with a closing mechanism, which can be opened with a three or square wrench by this is inserted at the hole 17 and then rotated. On the rear cabin side, a second lift door 18 is arranged here, consisting of two horizontally outwardly displaceable door parts. As you can see, the sidewall is divided into an upper left Side wall part 3 and a lower side wall part 6. Between these parts, a transverse strut 19 is arranged, which carries a handrail 5, here in the form of a chromium steel tube which is a few centimeters from the side wall spaced. Instead of a pipe, a strip can be provided, which can be engaged behind. The here upper side wall part 3 is a special feature with a few simple steps from the lift cabin side removable. For this purpose, first the fuse strip 16 is removed by the closing mechanism is released by means of a key. After removal of the fuse strip 16, the lateral retaining strips 14 can be removed. These are, for example, stuck in the bottom of moldings and connected at the top by a plug or screw connection to the frame of the elevator car. After removal of these retaining strips 14, these can be ajar for temporary storage, for example, on the opposite cabin wall. But now the lateral edges of the upper side wall part 3 are exposed. This side wall part 3 can now be grasped with the hands on the lateral edges and be lifted out of its lower holding profile, which runs along the upper edge of the lower side wall part 6, and afterwards parked on the cabin floor 36.

This situation is shown in FIG. The dismantled side wall part 3 is here parked on the elevator car floor 36 and is ajar against the handrail 5. Thus, through the created above the parked side panel 3 maintenance window, the view of all elements of the lift drive, which must be maintained and checked, released and these elements are also accessible manually. The dismantled side wall part 3 closes in the mounting position a contact switch, not shown here, which is mounted outside of the elevator car. Once the side wall part 3 is removed, the elevator car can not be driven. If the side wall portion 3, which is preferably 100cm high, placed on the floor 36 of the cabin and ajar against the handrail 5, so it forms with its upper edge 4 a proper parapet for the lift fitter, who now through the created open maintenance window on the elements the lift drive can carry out its work. Thus, the elevator car during this work and even more so for the purpose of performing this work with an open maintenance window, it must always be ensured that there is a prescribed distance of at least 10 cm between the parapet and the nearest parts moving relative to the lift cabin. By turning off the dismantled side wall part 3 and parking it in front of the lower side wall part 6 and leaning against the handrail 5, the same acts as a spacer. The lift drives are designed as narrow as possible to save space in the elevator shaft. The support and drive cables 41, 42 and the guide rails 23, 24 for the elevator car and the counterweight run correspondingly close to the elevator car. As a result of the parking of the removed side wall part 3, which is offset inwards into the cabin interior, this required distance of 10 cm can easily be maintained, as can be seen in the figure.

In a second step, this parked side wall part 3 is now secured from falling over and at the same time is achieved so that the elevator car can be driven again. This will be explained with reference to FIG. 12, where the upper side wall part 3 is seen on the elevator car floor in front of the lower side wall part 6, viewed from the side. On the outside of the elevator car, a cable holder 9 is mounted, and from this cable holder 9 leads from a two-pole cable 11 to an end-side plug 12. This plug 12 can be inserted as shown here on a socket 13, on the back of the removable upper side wall portion 3 is mounted. In the socket 13, the two poles of the plug 12 are electrically connected to each other. As soon as the plug 12 is plugged into the socket 13, a circuit is closed, so that the elevator car is mobile. This connector secures on the one hand the removable side wall part 3 from falling over in the elevator car, and on the other hand, it closes a circuit, so that the elevator car is mobile. Thus, the elevator car is mobile only when the dismantled side wall part 3 is correctly parked in front of the lower side wall part 6 and thus, first, a parapet 4 with the required minimum distance to the moving parts, such as the passing cables 7 is formed, and secondly the circuit for driving the elevator car is closed. However, this contact can be closed only with correctly turned off side wall part 3, because only then can the engraver 12 plug into the socket 13 and close the circuit.

Instead of a handrail 5, which serves as a spacer for the parked side wall part 3 here, can also serve a bracket, which is mounted on the back of the side wall part 3. For lifts where there is no handrail for space reasons, this solution is used. It is shown in FIG. On a bracket 21 which is mounted on the back of the side wall part 3, a bracket 19 is pivotally mounted. In the tilted position, it simply hangs on the pivot bearing and contributes to the rear on the back of the side wall part 3 little. After the side wall part 3 is turned off after disassembly on the cabin floor 36, the lift fitter can pivot the bracket 19 upwards and put it with its end-side profile 20 over the upper edge of the lower side wall part 6. This also ensures compliance with the required distance of at least 10 cm to the moving parts, as shown, and the side wall part 3 can not fall over. Then next the circuit is closed, as already described for Figure 12.

The wegnehmbare side wall portion 3 may be a mirror glass, which is inserted into a profile strip 22 at the upper edge of the stationary side wall portion 6 and by means of the lateral retaining strips 14 on the cabin wall is securable. Instead of a mirror glass, a transparent glass pane made of laminated glass can be used, or a panel made of wood, plastic or metal or a combination of these materials.

Figure 14 shows the elevator car in its uppermost position in the elevator shaft, in a section seen from the side. It can be seen that in this uppermost position of the elevator car, the traction drive with its drive pipe 26 lies laterally next to the elevator car, or that the elevator car 1 can be moved up to the traction drive. The mounting bridge of the drive is located in this uppermost position of the elevator car 1 below the upper edge of the elevator car 1 and even more of the traction drive, which is so mounted hanging on the mounting bridge. The support and traction cables 41, 42 run in two planes, the one Level is very close to the lift cabin. In Figure 15, the maintenance window is open. The upper side wall part 3 is placed accordingly in front of the lower side wall part 6 on the cabin floor 36, and that at a certain distance. This is defined by the above-described spacers, either by a stationary handrail 5, or by at least one spacer bracket 19, which are pivotable or hinged if necessary on the back of the removable side wall part 3. In FIG. 15 it can be seen how a sill 4 is formed from this removable side wall part 3. From the inside of the parapet 4 to the first rope 7 at least 10cm distance must be maintained, which can be easily achieved with this arrangement.

The drive presented here together with this lift cabin with maintenance window makes it possible for the first time to wait and control the lift exclusively from the elevator car. For this purpose, the entire stroke can be traveled with the lift cabin open with the maintenance window open and all components of the lift can be checked and serviced. The prerequisite is, of course, that all drive-relevant elements are accommodated on a single side of the elevator car. The elevator car has for this purpose an L-shaped chassis, and the rails 24 for the guidance of the elevator car 10 as well as those 23 for the counterweight 30 extend behind the standing leg of the L's. Also, the traction drive with driving tube 26 is located behind the standing leg of the L's, as well as acting as loose pulleys sheaves 28,29, all fasteners for the ropes 41, 42 and rails 23,24, and all limit switches. Thus, all these elements are visible through the maintenance window and accessible from the cab 1. Maintenance is carried out exclusively from the lift cabin 1 and is therefore much more comfortable and cleaner for the lift mechanic and, moreover, faster and safer.

With a lift cabin height of 220 cm, this cabin 1 can be driven almost to the upper end of the lift shaft head 43. Calculated only has the height of about 15 to 20cm to build the door drives for the lift doors, and a few centimeters buffer zone in the event that the elevator car due to the elasticity of the suspension ropes with the weight-relief when exiting the persons a few centimeters is raised. In any case, irrespective of the above, it is necessary to comply with the condition that a clearance F of 0.5m × 0.6m × 0.8m above the cab 1 is obtained, although a lift fitter never needs to climb the roof of this elevator cab 1. Fulfills the demand for this space F by the ceiling 44 of the elevator car 1 is designed compliant, so that the free space F would be available immediately, a body would be on the cabin roof and the elevator car 1 in the uppermost position shown here in the elevator shaft. 7 drive. As soon as the cab roof 44 has to absorb a certain load, it gives way downwards. In practice, it is sufficient if this load is 150N, for example - it is not that easy for a fitter anyway.

In a first variant, the roof 44 of the elevator car 1 can be made of a bare sheet metal, which is fastened from below by plug or clamp connections on the car roof. Once a certain load is exceeded, the connections dissolve and the roof 44 falls into the elevator car. In a further embodiment, the roof 44, for example, the size of a base of the required cuboid, ie in the size of 60cm x 80cm, 50cm x 60cm, or 50cm x 80cm held over a number of predetermined breaking points on a corresponding hatch in the elevator car roof. As soon as a certain load acts on the roof 44, the predetermined breaking points break and the roof 44 falls into the elevator cab 1. Next, the resilient roof piece can also be attached to ropes, which are, for example, spring-loaded extendable. This can be realized recordable, as shown in Figure 15, namely that the corners of the roof piece hang on wires 45, which are guided over pulleys 46,47 along the outside of the elevator car 1 and there are attached to tension springs 48. Of course, other guides of the wire cables are conceivable, so that they run only on the cabin roof. Once the spring forces are exceeded by a load on the roof, the roof 44 lowers the expansion of the springs 48 down, at least to the extent that the required space F is available. The resilient roof 44 may also be designed as a hinged roof by hinged to a corresponding hatch is held in the car roof, and is held on the side facing away from the hinge over a predetermined breaking point. The roof can also be designed as a wing door, so that so two on opposite sides of a hatch hinged hinged wings form the roof. A bolt provided with a predetermined breaking point closes the door wings and holds them together until a certain load has been exceeded. Then fold the two leaves down. With these optional different measures, the required free space F is available in any case, although technically it would no longer be necessary. But the requirement has been met and this now allows the construction of lifts with significantly reduced lift shaft heights. In practice, with cabin interior heights of 220cm, the minimum height of the lift shaft head is 255cm. This 45cm difference is needed by the cab design and especially by the motor drives for the lift doors as well as by a buffer zone. With even more compact electric motors for the door drives, the shaft head height can be further reduced by a few cm to approx. 240cm.

Claims

claims

A drive for an elevator car (1) and its counterweight (30), each guided on a pair of vertical guide rails (23, 24), characterized in that the drive is a gearless traction drive with stationary stator and outer, rotating and inside equipped with permanent magnets driving tube (26), via which the drive cables (41, 42) for the elevator car (1) and the counterweight (30) in cable grooves (8) are guided, and which traction drive hanging on a

Bridge (25) which is attached to the vertical guide rails (23,24) for the elevator car (1) and the counterweight (30).

2. drive for a lift cabin according to claim 1, characterized in that the bridge (25) in the uppermost position of the elevator car (1) below the

Upper edge is arranged and on the vertical guide rails (23,24) for the elevator car (1) and the counterweight (30) is fixed, and that the traction drive has a drive tube (26) with at least 240mm Aussend ruchmesser, and a performance of at least 2.4 kW and a torque of at least 295 Nm.

3. Drive for a lift cabin according to one of the preceding claims, characterized in that a first pair of parallel guide rails (23) for guiding the counterweight (30) is present, and parallel to the plane (38) between these two guide rails

(23) a further pair of parallel guide rails (24) is arranged at a greater distance from each other, on which the elevator car (1) is guided, and the traction drive tube (26) horizontally and parallel to the two planes (38,39) between the guide rails (23,24) of the two pairs of vertical guide rails (23,24) extends.

4. Drive for a lift cabin according to one of the preceding claims, characterized in that the inner pair of vertical Guide rails (23), the counterweight (30) is guided and these guide rails (23) closer to the shaft wall (7) are guided as the guide rails (24) of the other pair of guide rails (24) on which the elevator car (1) is guided.

Drive for a lift cabin according to one of the preceding claims, characterized in that the bridge (25) on which the traction drive is suspended, rests on the upper ends of the inner pair of guide rails (23) and on the outer two guide rails (23). 24) of the pair of guide rails (24) to which the elevator car (1) is guided.

6. Drive for a lift cabin according to one of claims 3 to 5, characterized in that the traction drive is mounted so that the axis of rotation (37) of its driving tube (26) to compensate for acting on the driving tube

Weight forces of the elevator car (1) on the one hand and counterweight (30) on the other hand in the middle between the two planes (38,39) of the two guide rail pairs (23,24) extends.

Drive for an elevator car according to one of claims 3 to 6, characterized in that the bridge (25) on which the traction drive is suspended, rests on the upper ends of the inner pair of guide rails (23) and on the outer two guide rails (24) of the pair of guide rails (24) to which the elevator car (1) is guided by the bridge (25) forming a frame consisting of two frame members

(27) each consisting of steel plates bent to a C-shape, these two frame members (27) being arranged opposite each other with the open side of their C-shape, and the lower, horizontally extending legs (33) of the C Form on the upper ends of the inner guide rails (32) rest, while the upper, horizontally extending legs (32) of the C-shape with a resting on these legs (32) profile as a bridge (25) are connected and screwed while the vertically extending portions of the C-shaped frame members (27) clamped by means of clamping means (31) with the outside on them outer guide rails (24).

8. Drive for a lift cabin according to one of the preceding claims, characterized in that six cables (41, 42) are guided around the traction tube (26), wherein the first of the shaft wall (7) leading down six cables (41) the counterweight (30) by wearing three ropes each one of two acting as loose rollers sheaves (29) with three grooves, the axle bolts (11) extend horizontally and parallel to each other and carry a hanging on them counterweight (30), which on the inner rail pair (23) is guided, and that the axle bolts (11) of these pulleys (29) perpendicular to the axis (38) of the drive tube (26) extend, wherein the ropes (41) on the other side of the pulleys (29) to the frame (27 ) of the bridge (25) and on the lower leg (33) of the C-shaped frame member (27) are attached, and that further from the driving tube (26) leading down six further, located on the side of the elevator car (1) ropes (42) the lift cabin (1) or carry their lower platform (36) by wearing three ropes (42) acting on each of two acting as loose rollers sheaves (28) with three grooves, the axle bolts (11) horizontally and parallel to each other and carry the lift car platform (36) , which on the outer rail pair

(24) is guided, and that the axle bolts (11) of these sheaves (28) perpendicular to the axis (38) of the drive tube (26) extend, wherein the ropes (42) on the other side of the sheaves (28) to the frame of the bridge (25) and on the lower leg (33) of the C-shaped frame portion (27) are attached.

9. Drive for a lift cabin according to one of the preceding claims, characterized in that the elevator car (1) is equipped on the drive side facing with a maintenance window by a 85 cm above the cabin floor (1) of the cabin wall (2) arranged part ( 3) is designed to be removable after the inside of the cabin, this part (3) is at least 95cm high and after removal on the cabin floor (1) standing to form a parapet (4) to this cabin wall (2) leaning wherein there is at least one spacer (5, 19) between this removable part (3) and the lower part (6) of the cabin wall (2), so that the distance from the interior side of the cabin facing the floor (1) parked side wall part (3) to the relative to the moving elevator car moving elements (7,8) of the lift drive is at least 10cm.

10. Drive for a lift cabin according to claim 9, characterized in that the spacer (5) is formed by a horizontally arranged handrail, which is mounted at a height of 800mm to 950mm on the cabin wall (2) and protrudes from that, and a safety device is provided so that the elevator car is only mobile when the side wall part (3) is removed, when the side wall part (3) is placed on the floor and forms a parapet (4), the safety device forming an electrical loop which supports a cable holder (9) the outer side of the cabin (1) encloses, a leading away from this two-pole cable (11) with plug (12), wherein the plug (12) on the back of the side wall part (3) in a mounted there jack (13) can be inserted, which the two poles electrically connect in its interior.