Lift with a tiltable carrying sheave assembly

Abstract

The invention relates to a passenger and / or goods lift with a rope pulley (3) for raising and lowering the lift car (2) and its counterweight (4) with a drive pulley (5) arranged on top, wherein the rope pulley is guided by a support pulley arrangement (6) on the counterweight (4), the axis of rotation (13) of which is rotated by approximately 90° relative to the axis of rotation (12) of the drive pulley and is pivotable about a pivot axis (22) on the underside parallel to the axis of rotation (12) of the drive pulley (5). This enables a very compact design of the lift.

Description

[0001] The invention relates to an elevator, in particular a passenger and / or goods elevator, with a rope pulley for raising and lowering an elevator car and a counterweight connected to it, wherein this rope pulley is guided by means of a drive pulley preferably rotatably connected to a motor at the top and around at least one rope pulley of a support pulley arrangement held on the counterweight, wherein the axis of rotation of the at least one rope pulley is aligned approximately perpendicular to the axis of rotation of the drive pulley.

[0002] Elevators of this type are typically housed in a building's elevator shaft, which, for space reasons, should have the smallest possible cross-section and be built to save space in terms of height. For this reason, one measure taken is to orient the counterweight's support rollers at approximately 90° to the motor's drive roller, thereby reducing the shaft width.

[0003] In conventional elevators of this type, the counterweight typically moves along a vertical plane defined by the cable extending perpendicularly from the drive pulley. This results in the support pulley assembly protruding at the rear by approximately half the width of the drive pulleys, necessitating a shaft width that is roughly the same amount larger. Further disadvantages arise from the limited space available for the counterweight guide rails and the cabin doors.

[0004] The invention is based on the objective of avoiding these disadvantages and creating an elevator of the type mentioned above which can be installed in a shaft with a reduced cross-section or reduced height using structurally simple means, without having to reduce the cabin size.

[0005] This problem is solved according to the invention by making the at least one rope pulley of the support pulley arrangement pivotable on the counterweight about a pivot axis which runs approximately parallel to the axis of rotation of the drive pulley.

[0006] This allows the counterweight to be guided along an inwardly relocated plane, because its support roller assembly can automatically adjust itself to the counterweight's position in the shaft thanks to the pivoting of its cable pulleys. The space behind the counterweight remains clear, thus preventing any loss of available shaft width. The invention therefore enables a very compact design and a symmetrical door arrangement in the elevator car, which offers advantages in terms of manufacturing and assembly. The 90° rotation between the cable pulleys of the counterweight's support roller assembly and the drive pulley is also maintained.

[0007] This space advantage makes it possible to install the elevator in relatively narrow shafts. A symmetrical door arrangement is also possible.

[0008] It is also advantageous in terms of the desired space saving if, in the case of a usually plate-shaped counterweight, the pivot axis of the support roller arrangement is arranged on the central plane of the counterweight between its guide rails.

[0009] In order to avoid excessively stressing the guide rails of the counterweight, it is advisable to minimize the swivel angle of the support roller arrangement in the upper end position of the counterweight.

[0010] It is also advantageous for static reasons if the pivot axis of the support roller arrangement is located in the center plane of the counterweight.

[0011] The invention further provides that the support roller assembly consists of two rope pulleys rotatable parallel to each other within a housing, the housing being pivotable on its underside about a pivot axis mounted on the counterweight. This results in a more even distribution of stress on the rope over a longer section than with a single rope pulley. Furthermore, the counterweight is guided more effectively by the rope. In this respect, it is advantageous to design the rope system such that it consists of several individual ropes running side by side.

[0012] The invention further provides that the individual ropes of the cable pull are attached at both ends to spring assemblies located directly below the motor or arranged one above the other in the elevator shaft. In this way, the tension of the individual ropes can be balanced without requiring a significantly larger elevator shaft.

[0013] The invention and further advantages thereof are explained in more detail below with reference to an exemplary embodiment and the drawing. The drawing shows: Fig. 1 a perspective side view of the guide of the counterweight in an upper and a lower position and of the motor arranged on the top of an elevator according to the invention; Fig. 2 a perspective rear enlarged view of the guide of the counterweight and the motor according to Fig. 1 ; Fig. 3 the upper area of ​​the elevator in the shaft after Fig. 1 shown in section; Fig. 4 shows a section of the elevator in the shaft along line IV - IV according to Fig. 3 ; Fig. 5 a perspective view of a support roller arrangement of the elevator according to Fig. 1 ; and Fig. 6 a perspective rear view of the support roller arrangement according to Fig. 5 .

[0014] Fig. 1 bis Fig. 4 The figures show an elevator that can be installed in a shaft 1 with a substantially rectangular cross-section and includes a cabin 2 for accommodating persons and / or goods, a cable pulley 3 driven by a drive pulley 5 of a motor 11 for raising and lowering the cabin 2, and a counterweight 4 connected to the cabin via the cable pulley. The cable pulley 3 is guided around two parallel cable pulleys 21a, 21b of a support pulley assembly 6 on the cabin's counterweight 4. The cabin 2 and the counterweight 4 can travel along guide rails 7 and 8, respectively, which are attached laterally in the shaft 1 by means of base elements 7'. The latter are components of a support frame 9 with an upper support bracket 10 on which the motor 11 with the drive pulley 5 is mounted.

[0015] The counterweight 4 is plate-shaped and has a planar cross-section, with the axis of rotation 12 of the drive roller 5 of the motor 11 being approximately on the central plane of the counterweight 4, while the axes of rotation 13 of the rope rollers 21a, 21b of the support roller arrangement 6 are aligned by approximately 90° to the axis of rotation 12 of the drive roller, so that the required clear shaft width can be reduced.

[0016] According to Fig. 3 The cable 3 runs downwards from the motor-side cable end 14 around the pulleys 21a, 21b of the support pulley assembly 6 above the counterweight 4, then upwards again to the drive pulley 5 of the motor 11, and subsequently around guide pulleys 15 located on the underside of the elevator car 2, back up to the other cable end 16. The latter is attached opposite the motor 11 on the other side of the car at the upper end of the shaft 1. Both the counterweight 4 and the car 2 are shown in their upper end position. In the actual installed state, however, the car 2 is in its lower end position when the counterweight is at its highest point.

[0017] The cable system 3 consists of several parallel individual cables 3', which are not illustrated in detail. These cables are attached at cable ends 14 and 16 to spring assemblies 18 and 19, respectively. At cable end 14, the spring assemblies are positioned directly below the motor 11, while at cable end 16, they are stacked one above the other at the top of shaft 1. This arrangement allows for optimal use of the available space. The spring assemblies 19 are not arranged in a single row. For example, if there are a total of nine individual cables 3', five are in a lower row and four are in an upper row. These are arranged horizontally at approximately the same height, but slightly offset inwards.

[0018] The individual cables 3' of the cable pull 3 at the cable pull end 14 on the support bracket 10 of the motor 11 are attached to a pivotable bracket 17, which comprises a retaining element 26 fixed to the support bracket 10 and a profile 28 pivotably mounted in it about an axis 29. This allows one end of the cable pull 3 to pivot about the axis 29 parallel to the axis of rotation 12 of the drive pulley 5. The individual cables 3' of the cable pull 3 are detachably attached at their ends to the profile 28.

[0019] Fig. 5 und Fig. 6 Figure 1 shows the support roller assembly 6, which can be attached to the top of the counterweight 4 and, according to the invention, consists of a housing 20 with two rotatable rope pulleys 21a, 21b and a pivot axis 22 pivotally mounted on the housing 20. This allows the rope pulleys to adjust themselves automatically depending on the position of the counterweight 4. When the counterweight is in the upper end position of the shaft 1, the pivot angle α of the rope pulleys 21a, 21b of the support roller assembly 6 relative to the direction of movement of the counterweight is as shown in Figure 2. Fig. 3 removable, deflected to its maximum extent.

[0020] The arrangement according to the invention does indeed entail that certain rail forces act on the counterweight 4. In order not to overload these parts, it is practical to limit the pivot angle α of the support roller arrangement 6 in this upper end position of the counterweight 4 to a specific value, for example to approximately 8°, and to offset the pivot axis 22 a small amount outwards from the central plane of the drive roller 5.

[0021] This pivot axis 22 is very advantageously arranged at right angles to the axes of rotation 13 of the rope pulleys 21a, 21b and parallel to the axis of rotation 12 of the drive pulley 5 and approximately on the central plane of the counterweight 4. Due to the pivotability of the support pulley arrangement 6, the counterweight 4 can be guided in an inwardly offset path towards the cabin, compared to known solutions.

[0022] The pulleys 21a and 21b are identical in design, and their profile features a number of annular grooves 21' for each individual cable of the cable pull 3. Depending on the design, the pivot axis 22 may be slightly offset from the central plane of the counterweight 4 to achieve an optimal arrangement for space saving. The housing 20 should not protrude from the planes of the counterweight's side walls when inclined.

[0023] The design of the support roller assembly 6 with two rope pulleys 21a, 21b arranged side by side is advantageous both for guiding the counterweight 4 and for loading the individual rope pulleys. However, the space advantages resulting from the invention are also achieved with a support roller assembly consisting of a single rope pulley mounted centrally on the counterweight 4 or more than two pulleys, if, according to the invention, it is designed as a pendulum pulley that is pivotable on its underside about an axis parallel to the axis of rotation of the drive pulley.

[0024] The invention is sufficiently demonstrated by the exemplary embodiments described. However, it could be further illustrated by other variations. For example, the cable could be guided around guide rollers on the top of the cabin.

[0025] The cable pulley could also be designed without pulleys on the cabin or the counterweight. In such a design, instead of the pulley of the support pulley arrangement on the counterweight, a cable end attachment would be used, which would be pivotably arranged on its underside about an axis parallel to the rail axis of the counterweight, analogous to the pivot axis 22.

Claims

1. Elevator, in particular a passenger and / or goods elevator, with a rope pulley (3) for raising and lowering an elevator car (2) and a counterweight (4) connected thereto, wherein this rope pulley (3) is guided by means of a drive pulley (5) preferably rotatably connected to a motor (11) at its upper side around at least one rope pulley (21a, 21b) of a support pulley arrangement (6) held on the counterweight (4), wherein the axis of rotation (13) of the at least one rope pulley (21a, 21b) is aligned approximately perpendicular to the axis of rotation (12) of the drive pulley (5), characterized by the fact that at least one pulley (21a, 21b) of the support pulley arrangement (6) is pivotable on the counterweight about a pivot axis (22) which runs approximately parallel to the axis of rotation (12) of the drive pulley (5).

2. Elevator according to claim 1, characterized by the fact thatthe pivot axis (22) is arranged on the underside of the at least one cable pulley (21a, 21b) in the support roller arrangement (6) and extends, like the axis of rotation (12) of the drive roller (5), approximately on the central plane of the plate-shaped counterweight (4) between guide rails (7).

3. Elevator according to claim 1, characterized by the fact that the swivel angle (α) of the support roller arrangement (6) in the upper end position of the counterweight (4) is limited, for example to approximately 8°.

4. Elevator according to one of claims 1 to 3, characterized by the fact that the pivot axis (22) of the support roller assembly (6) is arranged in the vertical central plane of the cabin (2).

5. Elevator according to one of claims 1 to 4, characterized by the fact that the support roller arrangement (6) consists of two rope rollers (21a, 21b) rotatable parallel to each other in a housing (20), the housing being pivotable on the underside about a pivot axis (22) mounted on the counterweight (4).

6. Elevator according to one of claims 1 to 5, characterized by the fact that the cable pull (3) is composed of several individual ropes running parallel to each other.

7. Elevator according to one of claims 1 to 6, characterized by the fact that The cable (3) runs downwards from the motor-side cable end (14) around the cable pulleys (21a, 21b) of the support pulley arrangement (6) above the counterweight (4) and upwards again to the drive pulley (5) of the motor (11) and consequently around guide pulleys (15) arranged on the underside of the elevator car (2) to the other cable end (16), which is preferably attachable opposite the motor (11) at the upper end of a shaft (1).

8. Elevator according to claim 6, characterized by the fact that the individual ropes of the rope pull (3) are attached at least at the rope pull end (16) at the shaft (1) to spring assemblies (19) arranged one above the other.

9. Elevator according to one of claims 1 to 8, characterized by the fact thatthe individual ropes of the cable pull (3) are attached at least at the cable pull end (14) at the support bracket (10) of the motor (11) to a pivotable bracket (17) which at least allows one end of the cable pull (3) to pivot about an axis (29) parallel to the axis of rotation (12) of the drive roller (5).

10. Elevator according to claim 9, characterized by the fact that the pivotable bracket (17) comprises a holding element (26) fixed to the support frame (10) and a profile (28) pivotably mounted in it about the axis (29), in which the individual ropes of the cable pull (3) are detachably fastened at their ends.

11. Carrying roller arrangement for a lift according to one of claims 1 to 10, characterized by the fact that at least one pulley (21a, 21b) of the support pulley arrangement (6) is pivotable about a pivot axis (22) which is approximately perpendicular to the axis of rotation (13) of the pulley (21a, 21b).

12. Carrying roller arrangement according to claim 11, characterized by the fact thatthe support roller arrangement (6) comprises a housing (20) and two rope rollers (21a, 21b) arranged parallel to each other in it, wherein the housing is pivotable on the underside about the supported pivot axis (22).