Lifting mechanism, lifting assembly and lifting device

Abstract

The utility model provides a lifting mechanism, a lifting assembly and a lifting device. The lifting mechanism comprises a motor, the motor comprises a shell assembly, a driving assembly and an output piece, the driving assembly and the output piece are arranged in the shell assembly, and the driving assembly can drive the output piece to rotate; the lead screw comprises a threaded column and a polished rod column which are connected, the polished rod column is connected to the output piece, and the threaded column is used for being connected with the outer pipe; the connecting structure comprises a first bearing and a bearing seat, the bearing seat is of an integrated structure and fixed to the shell assembly, the first bearing is installed in the bearing seat and arranged on the polish rod column in a sleeving mode, so that the bearing seat, the first bearing and the lead screw are relatively fixed in the preset direction, and the preset direction is the axial direction of the lead screw. According to the structural form of the lifting mechanism, the output piece can not bear axial force from the lead screw any more or only bear part of the axial force, and therefore the service life of the motor is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifting mechanism, in particular to a lifting mechanism, a lifting assembly and a lifting device. BACKGROUND

[0002] In recent years, lifting devices with lifting function (such as lifting tables and lifting chairs) are becoming more and more popular, which usually include a lifting mechanism, an outer tube and a carrier. The lifting mechanism is provided with a lead screw and a motor, the output end of the motor is connected to the lead screw, the lead screw is threadedly connected with the outer tube, one end of the outer tube is fixedly connected to the carrier, and the carrier is a table top or a chair surface. When the output end of the motor drives the lead screw to rotate, the outer tube drives the carrier to rise or fall. It can be understood that the lead screw will at least bear the weight from the outer tube and the carrier, that is, the lead screw will be subjected to a vertical downward axial force, which will be transmitted to the output end of the motor, thereby causing the output end of the motor to produce abnormal sound, and also causing the reduction gear in the motor to rotate unsmoothly, thereby seriously reducing the service life of the motor. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a lifting mechanism, a lifting assembly and a lifting device, wherein the structural design of the lifting mechanism can make the output member no longer bear the axial force from the lead screw or only bear part of the axial force, thereby improving the service life of the motor.

[0004] In a first aspect, the present application provides a lifting mechanism, which comprises:

[0005] a motor, the motor comprising a housing assembly, a driving assembly and an output member, the driving assembly and the output member being arranged in the housing assembly, and the driving assembly being capable of driving the output member to rotate;

[0006] a lead screw, the lead screw comprising a threaded column and a light rod column connected with each other, the light rod column being connected to the output member, and the threaded column being used for connecting an outer tube; and

[0007] a connecting structure, the connecting structure comprising a first bearing and a bearing seat, the bearing seat being an integral structure and being fixed to the housing assembly, the first bearing being installed in the bearing seat and being sleeved on the light rod column, so that the bearing seat, the first bearing and the lead screw are relatively fixed in a preset direction, wherein the preset direction is the axial direction of the lead screw.

[0008] In some embodiments, the first bearing is arranged on the side of the output member close to the outer tube and is spaced apart from the output member in the preset direction.

[0009] In some embodiments, the bearing seat comprises a barrel portion having a receiving space and a blocking portion protruding from an inner wall of the barrel portion constituting the receiving space, and the connecting structure further comprises a first circlip arranged in the receiving space, and the first bearing is arranged between the first circlip and the blocking portion.

[0010] In some embodiments, the inner wall of the barrel portion is provided with a first groove, and the first circlip is arranged in the first groove.

[0011] In some embodiments, the connecting structure further comprises a second circlip sleeved on the outer periphery of the polished rod column, and the first bearing is arranged between the second circlip and the threaded column.

[0012] In some embodiments, the polished rod column is provided with a second groove, and the second circlip is arranged in the second groove.

[0013] In some embodiments, the polished rod column has a non-circular cross-sectional shape, the output member is provided with a matching hole matching the shape of the polished rod column, and the polished rod column is inserted into the matching hole.

[0014] In some embodiments, the shell assembly and the bearing seat are detachably connected.

[0015] In a second aspect, the application further provides a lifting assembly, which comprises an outer tube and a lifting mechanism, and a lead screw of the lifting mechanism is inserted into the outer tube and is threadedly connected together.

[0016] In a third aspect, the application further provides a lifting device, which comprises a carrier and at least one lifting assembly, and an outer tube of the lifting assembly is fixedly connected to the carrier.

[0017] In the lifting mechanism provided by the application, the bearing seat, the first bearing and the lead screw are relatively fixed in a preset direction, so that when the lead screw is subjected to an axial force in the preset direction, at least part of the axial force will be transmitted from the lead screw to the first bearing, and then from the first bearing to the bearing seat. Since the bearing seat is fixed on the shell assembly, the axial force will finally be transmitted to the shell assembly, i.e., the shell assembly will share at least part of the axial force borne by the lead screw. Therefore, the structure of the lifting mechanism provided by the application can make the output member no longer bear the axial force from the lead screw or only bear part of the axial force, which can avoid or weaken the problems of abnormal noise at the output member and poor rotation of the internal reduction gear of the motor, thereby improving the service life of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 The schematic diagram of the lifting mechanism provided by the embodiments of the present application is shown.

[0020] Figure 2 The exploded view of the lifting mechanism shown in Figure 1

[0021] Figure 3 The cross-sectional view of the lifting mechanism shown in Figure 1

[0022] Figure 4 The schematic diagram of the A area of the lifting mechanism shown in Figure 3

[0023] The schematic diagram of the bearing seat provided by the embodiments of the present application is shown. Figure 5

[0024] The schematic diagram of the screw rod provided by the embodiments of the present application is shown. Figure 6

[0025] The cross-sectional schematic diagram of the screw rod and the output in the assembled state provided by the embodiments of the present application is shown. Figure 7

[0026] The schematic diagram of the motor provided by the embodiments of the present application is shown. Figure 8

[0027] The schematic diagram of the lifting assembly provided by the embodiments of the present application is shown. Figure 9

[0028] The schematic diagram of the lifting device provided by the embodiments of the present application is shown. Figure 10 Legend of the drawings:

[0029] Lifting device-100; lifting assembly-1; carrier-2; base-3;

[0030]

[0031] ​​​Lifting mechanism-10; motor-11; housing assembly-111; shell-1111; fixing member-1112; driving assembly-112; power assembly-1121; speed reduction assembly-1122; output member-113; second bearing-114; screw rod-12; threaded column-121; light pole column-122; connecting structure-13; first bearing-131; bearing seat-132; cylinder part-1321; blocking part-1322; skirt part-1323; first clamping spring-133; second clamping spring-134; threaded member-14; outer tube-20; containing space X1; first groove X2; second groove X3; matching hole X4; first mounting hole X5; second mounting hole X6. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Reference herein to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment or embodiments can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. Those skilled in the art will appreciate that the embodiments described herein are merely examples of the present application and are not the only way in which the present application can be practiced.

[0034] Please refer to Figures 1 to 4 The present application provides a lifting mechanism 10, which comprises a motor 11, a screw rod 12, and a connecting structure 13.

[0035] The motor 11 comprises a housing assembly 111, a driving assembly 112, and an output member 113 (as shown in Figure 3 and Figure 4 The driving assembly 112 and the output member 113 are arranged in the housing assembly 111, and the driving assembly 112 can drive the output member 113 to rotate. The driving assembly 112 can comprise a power assembly 1121 and a speed reduction assembly 1122, wherein the power assembly 1121 is a power source, the speed reduction assembly 1122 comprises a plurality of speed reduction gears, the power generated by the power assembly 1121 is transmitted to the output member 113 through the speed reduction assembly 1122, so that the output member 113 rotates. The output member 113 can be regarded as an output end of the motor 11.

[0036] The screw rod 12 comprises a threaded column 121 and a light rod column 122 connected with each other. The threaded column 121 refers to a column part of the screw rod 12 provided with external threads, and the light rod column 122 refers to a column part of the screw rod 12 without external threads. The threaded column 121 is used to connect an outer tube provided with a threaded hole, and the threaded column 121 is screwed into the threaded hole of the outer tube. The light rod column 122 is connected to the output member 113, and the light rod and the output member 113 are fixed relative to each other in the circumferential direction, so that the output member 113 drives the light rod to rotate when the output member 113 rotates, that is, the output member 113 can drive the screw rod 12 to rotate. When the screw rod 12 rotates, the outer tube moves close to or away from the motor 11.

[0037] The connecting structure 13 comprises a first bearing 131 and a bearing seat 132. The bearing seat 132 is an integral structure, that is, the bearing seat 132 is physically an undividable whole, so that the assembly process of the bearing seat 132 and other components can be simplified. The bearing seat 132 is fixedly installed on the housing assembly 111, and the installation form can be detachable or non-detachable.

[0038] The first bearing 131 is fixedly installed in the bearing seat 132 and sleeved on the light rod column 122, so that the bearing seat 132, the first bearing 131 and the screw rod 12 are relatively fixed in a preset direction. The relative fixation refers to that the three cannot move relative to each other in the preset direction. The preset direction is the axial direction of the screw rod 12, that is, the length direction of the screw rod 12.

[0039] The first bearing 131 can be a radial bearing or a thrust bearing, and the present application only exemplarily illustrates the radial bearing. The inner ring of the first bearing 131 is sleeved on the light rod column 122, and the outer ring is fixed on the bearing seat 132. When the screw rod 12 rotates, the inner ring of the first bearing 131 rotates synchronously with the screw rod 12.

[0040] In the prior art, the axial force of the screw rod in the preset direction is completely transmitted to the output member, which causes abnormal noise and causes the reduction gear in the reduction assembly to rotate unsmoothly, thereby seriously reducing the service life of the motor.

[0041] In the lifting mechanism 10 provided by the present application, since the bearing seat 132, the first bearing 131 and the screw rod 12 are relatively fixed in the preset direction, when the screw rod 12 is subjected to an axial force in the preset direction, at least part of the axial force will be transmitted from the screw rod 12 to the first bearing 131, and then from the first bearing 131 to the bearing seat 132. Since the bearing seat 132 is fixed on the shell assembly 111, the axial force will finally be transmitted to the shell assembly 111, that is, the shell assembly 111 will share at least part of the axial force borne by the screw rod 12. Therefore, the structural form of the lifting mechanism 10 provided by the present application can make the output member 113 no longer bear the axial force from the screw rod 12 or only bear part of the axial force, so as to avoid or weaken the problems of abnormal sound at the output member 113 and poor rotation of the reduction gear inside the motor 11, thereby improving the service life of the motor 11.

[0042] Please refer to Figure 4 , the first bearing 131 is arranged on the side of the output member 113 close to the outer tube, and the first bearing 131 and the output member 113 are arranged in the preset direction. That is, the first bearing 131 and the output member 113 are spaced apart in the preset direction. In this way, the axial force from the screw rod 12 can be prevented from being directly transmitted from the first bearing 131 to the output member 113, thereby improving the service life of the motor 11.

[0043] Please refer to Figure 4 and Figure 5 , the bearing seat 132 comprises a cylinder portion 1321, a skirt portion 1323 and a blocking portion 1322. The cylinder portion 1321 has an accommodation space X1 which penetrates the cylinder portion 1321 in the preset direction. The blocking portion 1322 is protruded from the inner wall of the cylinder portion 1321 which constitutes the accommodation space X1, that is, the blocking portion 1322 is arranged in the accommodation space X1 and protrudes from the inner wall of the cylinder portion 1321. The skirt portion 1323 is connected to the outer periphery of the cylinder portion 1321 away from the accommodation space X1, and the skirt portion 1323 is connected to the shell assembly 111 to fix the bearing seat 132 on the shell assembly 111.

[0044] The connecting structure 13 further comprises a first circlip 133, which can also be called a retainer or a snap ring. The first circlip 133 is arranged in the accommodation space X1. The first bearing 131 is arranged between the first circlip 133 and the blocking portion 1322. In this way, the first bearing 131 is clamped between the first circlip 133 and the blocking portion 1322, and the freedom degree of the first bearing 131 in the preset direction is limited by the first circlip 133 and the blocking portion 1322 respectively, so that the first bearing 131 and the bearing seat 132 are relatively fixed in the preset direction.

[0045] The inner wall of the barrel portion 1321 is provided with a first groove X2 which is an annular groove surrounding the accommodating space X1 and has a size and shape suitable for the first circlip 133. The first circlip 133 is arranged in the first groove X2, so that the first circlip 133 is fixed on the bearing seat 132 to avoid movement of the first circlip 133 in a predetermined direction, thereby effectively limiting the first bearing 131 in the bearing seat 132.

[0046] Please refer to Figure 4 and Figure 6 The connecting structure 13 further comprises a second circlip 134, which can also be referred to as a retaining ring or a snap ring. The second circlip 134 is sleeved on the outer periphery of the polished rod column 122, and the first bearing 131 is arranged between the second circlip 134 and the threaded column 121. It can be understood that, since the threaded column 121 has external threads, the first bearing 131 is clamped between the second circlip 134 and the external threads of the threaded column 121, and the freedom of the first bearing 131 in a predetermined direction is limited by the second circlip 134 and the external threads of the threaded column 121, respectively, so that the first bearing 131 is relatively fixed with the lead screw 12 in the predetermined direction.

[0047] The polished rod column 122 is provided with a second groove X3 which is an annular groove surrounding the polished rod column 122 and has a size and shape suitable for the second circlip 134. The second circlip 134 is arranged in the second groove X3, so that the second circlip 134 is fixed on the polished rod column 122 to avoid movement of the second circlip 134 in a predetermined direction, thereby effectively limiting the first bearing 131 on the polished rod column 122.

[0048] Optionally, the second circlip 134 and the output member 113 are arranged in a predetermined direction with a spacing, that is, the second circlip 134 and the output member 113 are spaced apart in the predetermined direction. In this way, the axial force from the lead screw 12 can be avoided from being directly transmitted to the output member 113 by the second circlip 134.

[0049] Please refer to Figure 4 and Figure 7The cross-sectional shape of the light rod column 122 is non-circular, that is, the cross-sectional shape of the light rod column 122 is not circular, and the cross-sectional shape of the light rod column 122 can be approximately elliptical, triangular, rectangular, oblong, pentagonal, hexagonal, etc. The output member 113 is provided with a matching hole X4 matching the shape of the light rod column 122, and the light rod column 122 is inserted into the matching hole X4, that is, the cross-sectional shape of the matching hole X4 is the same as that of the output member 113, so that the light rod column 122 can be inserted into the matching hole X4. For example, if the cross-sectional shape of the light rod column 122 is elliptical, the cross-sectional shape of the matching hole X4 is also elliptical, and if the cross-sectional shape of the light rod column 122 is hexagonal, the cross-sectional shape of the matching hole X4 is also hexagonal. It can be understood that the cross-sectional shape of the light rod column 122 is non-circular, so that the light rod column 122 and the output member 113 are relatively fixed in the circumferential direction (i.e. the rotation direction of the output member 113), and when the output member 113 rotates, the lead screw 12 will rotate synchronously with the output member 113. Alternatively, the output member 113 and the light rod column 122 are gap-fitted, so that the output member 113 and the light rod column 122 are relatively fixed in the circumferential direction (i.e. the rotation direction of the output member 113), but not relatively fixed in the preset direction. In other words, the gap fitting can ensure that the output member 113 can drive the light rod column 122 to rotate, and can also avoid that the axial force in the preset direction of the lead screw 12 is directly transmitted to the output member 113.

[0050] Please refer to Figure 4 and Figure 8 The housing assembly 111 includes a housing 1111 and a fixing member 1112, the fixing member 1112 is fixedly connected to the housing 1111 and located in the housing 1111, and the fixing member 1112 is connected to the skirt portion 1323 of the bearing seat 132. The housing 1111 and the fixing member 1112 can be detachably connected or non-detachably connected. The materials of the housing 1111 and the fixing member 1112 can be but are not limited to metal, plastic, etc. The motor 11 further includes a second bearing 114, which is installed in the fixing member 1112 and sleeved on the outer periphery of the output member 113. The second bearing 114 can be a radial bearing, the inner ring of the second bearing 114 is sleeved on the output member 113, and the outer ring is fixed on the fixing member 1112. When the output member 113 rotates, the inner ring of the second bearing 114 will rotate synchronously with the output member 113.

[0051] Optionally, the fixing member 1112 of the shell assembly 111 and the bearing seat 132 are detachably connected, and the detachable connection mode can be threaded connection (such as fastening by bolts), buckle connection (by elastic deformation or clamping), etc. The detachable connection mode can facilitate the assembly of the bearing seat 132 and the shell assembly 111, and if the lifting mechanism 10 is damaged, it can also be easily disassembled and repaired.

[0052] Optionally, the fixing member 1112 of the shell assembly 111 is provided with a first mounting hole X5 (as shown in Figure 8 Optionally, the bearing seat 132 is provided with a second mounting hole X6 (as shown in Figure 5 Figure 4 The lifting mechanism 10 further comprises a threaded member 14 (as shown in

[0053] Of course, in other embodiments, the fixing member 1112 of the shell assembly 111 and the bearing seat 132 can also be non-detachably connected, and the non-detachable connection mode can be bonding, welding, riveting, etc.

[0054] For the lifting mechanism provided in the present application, the following steps can be used for assembly: S100, S200.

[0055] S100: Assemble the lead screw and the connecting structure into one body.

[0056] S200: Assemble the lead screw, connecting structure and motor into one body.

[0057] For the above step S100, it can include steps S101, S102, S103, S104, as follows.

[0058] S101: Insert the light rod column of the lead screw into the inner ring of the first bearing.

[0059] S102: Install the first bearing in the accommodating space of the bearing seat.

[0060] S103: Place the first clamping spring in the first groove of the bearing seat.

[0061] S104: Place the second clamping spring in the second groove of the light rod column of the lead screw.

[0062] For the above step S200, it can include steps S201, S202, as follows.

[0063] S201: Insert the light rod column of the lead screw into the matching hole of the output member. ​

[0064] S202: mounting the bearing seat on the housing assembly.

[0065] It should be noted that the above steps S101, S102, S103 and S104 do not imply a sequence of execution, and the specific sequence can be S101, S102, S103 and S104, or S102, S101, S103 and S104, or S101, S102, S104 and S103, or other execution sequences, as long as the lead screw and the connecting structure can be assembled into one body, which will not be described here.

[0066] Please refer to Figure 9 The application also provides a lifting assembly 1, which comprises an outer tube 20 and the lifting mechanism 10 described in any of the embodiments, and the lead screw 12 of the lifting mechanism 10 is inserted into the outer tube 20 and is screwed together.

[0067] Specifically, the lead screw 12 comprises a threaded column 121 and a light rod column 122 connected to each other. The threaded column 121 refers to the column part of the lead screw 12 provided with external threads, and the light rod column 122 refers to the column part of the lead screw 12 without external threads. The outer tube 20 is provided with a threaded hole, and the threaded column 121 is screwed into the threaded hole of the outer tube 20. When the motor 11 drives the lead screw 12 to rotate, the outer tube 20 approaches or moves away from the motor 11.

[0068] The lifting mechanism 10 and the outer tube 20 can be detachably connected, that is, the lifting mechanism 10 and the outer tube 20 can be separated into two independent parts, and of course, the lifting mechanism 10 and the outer tube 20 can also be non-detachably connected, that is, the lifting mechanism 10 and the outer tube 20 cannot be separated into two independent parts.

[0069] Please refer to Figure 10 The application also provides a lifting device 100, which comprises a carrier 2 and at least one lifting assembly 1, and the outer tube 20 of the lifting assembly 1 is fixedly connected to the carrier 2. When the motor 11 drives the lead screw 12 to rotate, the outer tube 20 drives the carrier 2 to rise or fall.

[0070] The lifting device 100 can be but not limited to a lifting table, a lifting chair, a lifting bed, a lifting operating table, a lifting exhibition stand, a lifting stage, etc. For example, when the lifting device 100 is a lifting table, the lifting assembly 1 is a table leg, and the carrier 2 is a table top. When the lifting device 100 is a lifting chair, the lifting assembly 1 is a chair leg, and the carrier 2 is a chair surface.

[0071] The approximate shape of the carrier 2 can be circular, rectangular, triangular, etc. In one lifting device 100, the number of lifting assemblies 1 is greater than or equal to one, which can be 1, 2, 3, 4, 5, 6, etc. It can be understood that the more the number of lifting assemblies 1, the better the supporting effect of the carrier 2, and the more stable the overall lifting device 100.

[0072] The outer tube 20 of the lifting assembly 1 and the carrier 2 can be detachably connected, that is, the lifting assembly 1 and the carrier 2 can be split into two independent parts. Of course, the outer tube 20 of the lifting assembly 1 and the carrier 2 can also be non-detachably connected, that is, the lifting assembly 1 and the carrier 2 cannot be split into two independent parts.

[0073] In some embodiments, the lifting device 100 can further include a base 3 connected to the end of the lifting assembly 1 away from the carrier 2, which is used to provide stability to avoid the lifting device 100 from shaking, especially in the lifting device 100 with only one lifting assembly 1. The type of base 3 can be but not limited to a character-shaped base, a cross-shaped base, a circular / square tray base, an X-shaped base, a five-star foot base, etc.

[0074] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A lifting mechanism, characterized in that The lifting mechanism comprises: a motor, the motor comprising a housing assembly, a driving assembly and an output, the driving assembly and the output being arranged in the housing assembly, and the driving assembly being capable of driving the output to rotate; a screw rod, the screw rod comprising a threaded column and a light rod column connected with each other, the light rod column being connected to the output, and the threaded column being used for connecting an outer tube; and a connecting structure, the connecting structure comprising a first bearing and a bearing seat, the bearing seat being an integral structure and being fixed to the housing assembly, the first bearing being arranged in the bearing seat and being sleeved on the light rod column, so that the bearing seat, the first bearing and the screw rod are relatively fixed in a preset direction, wherein the preset direction is an axial direction of the screw rod.

2. The lifting mechanism of claim 1, wherein, The first bearing is arranged on a side of the output close to the outer tube and is spaced apart from the output in the preset direction.

3. The lifting mechanism of claim 1, wherein, The bearing seat comprises a cylinder portion and a blocking portion, the cylinder portion having an accommodating space, the blocking portion being protruded from an inner wall of the cylinder portion constituting the accommodating space, the connecting structure further comprising a first circlip, the first circlip being arranged in the accommodating space, and the first bearing being arranged between the first circlip and the blocking portion.

4. The lifting mechanism of claim 3, wherein, The inner wall of the cylinder portion is provided with a first groove, and the first circlip is arranged in the first groove.

5. The lift mechanism of claim 1, wherein, The connecting structure further comprises a second circlip, the second circlip being sleeved on an outer periphery of the light rod column, and the first bearing being arranged between the second circlip and the threaded column.

6. The lifting mechanism of claim 5, wherein, The light rod column is provided with a second groove, and the second circlip is arranged in the second groove.

7. The lifting mechanism according to any one of claims 1 to 6, wherein The light rod column has a non-circular cross-sectional shape, the output is provided with a matching hole matching the shape of the light rod column, and the light rod column is inserted into the matching hole.

8. The lifting mechanism according to any one of claims 1 to 6, wherein The housing assembly and the bearing seat are detachably connected.

9. A lift assembly characterized by, The lifting assembly comprises an outer tube and the lifting mechanism according to any one of claims 1 to 8, the screw rod of the lifting mechanism being inserted into the outer tube and being threadedly connected together.

10. A lifting device, characterized in that The lifting device comprises a carrier and at least one lifting assembly according to claim 9, the outer tube of the lifting assembly being fixedly connected to the carrier.

Images