Rotating rotary unit for a carriage and method for manufacturing such a rotary unit

Abstract

This invention relates to a rotary unit, preferably for a carriage, which can be manufactured by a method that is less expensive than that used for currently known rotary units, and by which an improved load-bearing behavior of the rotary unit can be achieved during normal use.

Description

[0001] This invention relates to a rotary unit, preferably for a cart, which can be manufactured by a method that is less expensive than that used for the currently known rotary units for a cart, and by which an improved load-bearing behavior of the rotary unit can be achieved during normal use.

[0002] The currently known rotating assemblies comprise at least one or two wheels designed to undergo rotational movements around a horizontal axis of rotation, operating parallel to the moving surface of the carriage. The currently known rotating assemblies also comprise at least one support frame designed to be connected to a frame of the carriage by means of a connection system, thus defining a connection state between the rotating assembly and the carriage frame.

[0003] The support frame of currently known rotary assemblies includes a pivot that defines the aforementioned horizontal axis of rotation. These currently known rotary assemblies include a mounting system designed to define a specific mounting position for the wheels on the pivot. When these wheels are in this mounting position on the pivot, the mounting system enables the wheels to rotate around the pivot.

[0004] The currently known rotary assemblies are designed such that the rotary movements of the respective wheels around the pivot, when they occur on a moving surface, cause the movement of the carriage frame and therefore of the carriage on the moving surface when the wheels assume this assembly state and the rotary assembly assumes the connected state.

[0005] It can happen that the rolling of the wheels on the moving surface causes them to pick up foreign objects such as threads. This can lead to these foreign objects being positioned between the support frame and the pivot, and / or, if they are flexible and elongated, to wrapping themselves around the support frame and / or the pivot. This can therefore cause a malfunction of the rotating unit and even blockage of the wheels.

[0006] Furthermore, there is now a need for these rotary units to have a locking function on mobile floors, such as the moving walkways of supermarkets.

[0007] This locking function consists of the fact that the rotating unit is designed to be able to assume a locking state in which the rotational movements of the wheels are inhibited, by inserting the wheels into respective grooves of the mobile floor and by simultaneously placing a locking surface, which is firmly connected to the rotating unit, onto a supporting element located between the grooves.

[0008] Furthermore, the need to provide a locking surface that is positioned to allow such a locking state requires, in currently known rotary assemblies, the provision of a locking body that defines the locking surface and is located outside the support frame, as well as the provision of a system that can hold this locking body in position.

[0009] Furthermore, it is now a recognized requirement that the rotating unit has a rotational function. A rotating unit with a rotational function is understood to be one designed in such a way that the support frame, and thus also the wheels mounted on it, can rotate effectively relative to the frame of the carriage to which the support frame of the wheels is connected via the connection system, specifically around a vertical axis of rotation that is effectively arranged perpendicular to the moving surface.

[0010] This vertical axis of rotation is defined by the connection system, which can therefore also be defined as a rotation system.

[0011] For this purpose, the rotation system includes an end-face bearing that enables the rotation of the rotating unit around the vertical axis, and a vertical pin that defines this vertical axis of rotation.

[0012] This vertical axis is normally spaced apart from the horizontal axis, so that the distance between them defines a lever arm. This lever arm allows the support frame to align itself around the vertical axis, thanks to the contact between the wheels and the moving surface, which essentially occurs at a point that, under normal circumstances, is located substantially along a line perpendicular to the moving surface and passing through the horizontal axis. Since the rotating unit is equipped with the rotation function around the vertical axis V and with this lever arm, it can be described as a "rotating" or "swiveling" rotating unit.This means that a rotary unit with the aforementioned rotation function and the aforementioned distance between the vertical axis of rotation of the support frame and the horizontal axis of rotation of the wheels can be considered a rotatable or "swivelable" rotary unit.

[0013] It must be taken into account that the weight of the cart's frame is transferred to the rotating unit by the rotating system and acts along the vertical axis.

[0014] Due to the distance between the aforementioned vertical axis and the aforementioned horizontal axis, which serves to make the rotating assembly rotatable, the weight of the cart's frame causes a bending effect on the rotating assembly, which can lead to bending deformation of the assembly in a bending plane. This bending plane is arranged perpendicular to the horizontal axis and contains the vertical axis.

[0015] This bending deformation can cause malfunctions in the supporting structure, such as damage to the aforementioned end-face bearing and the resulting failure of the rotation system. This deformation could also cause the end-face bearing to dislodge from its seat.

[0016] For the technical background of the invention, reference is also made to the prior art according to DE 10 2012 015 890 A1, JP 2016 - 141 364 A and GB 2 272 366 A.

[0017] The purpose of this description is to provide a rotatable rotation unit that can be used, for example, for a cart and is designed to significantly reduce the risk of disturbances to the supporting structure due to the distance between the aforementioned horizontal axis of rotation of the wheels and the aforementioned vertical axis of rotation of the support frame.

[0018] Another purpose of this description is to provide a rotatable rotary unit that can be used, for example, for a cart and is easier to manufacture than the rotary units currently known.

[0019] Another task of this description is to provide a rotary unit that fulfills the above-mentioned tasks and also has the above-mentioned locking function.

[0020] A manufacturing process according to this description allows the production of a rotary unit as described.

[0021] These tasks are accomplished by a rotary unit for a carriage, comprising the features that result from any one of the attached claims 1-9 and are intended to protect the rotary unit.

[0022] These tasks are accomplished by a manufacturing process comprising the features resulting from any one of the attached claims 10 and 11, which are intended to protect the process.

[0023] The features of a rotary unit and a manufacturing process according to this description become clearer from the following detailed description, which refers to a possible exemplary embodiment of a rotary unit as described and to a possible exemplary embodiment of a manufacturing process as described, which serve as a non-limiting example for the claimed invention concepts.

[0024] The following detailed description refers to the attached drawings. They show: - Fig. 1 a perspective view of a possible exemplary embodiment of a rotary unit as described; - Fig. 2 another perspective view of this embodiment of the rotary unit; - Fig. 3 a front view of this embodiment of the rotary unit; - Fig. 4 a rear view of this embodiment of the rotary unit in an exemplary locked state; - Fig. 5 a side view of this embodiment of the rotary unit; - Fig. 6 a view of section VI-VI from Fig. 3; - Fig. 6A close-up of the circled detail from Fig. 6A; - Fig. 7 a view of section VII-VII from Fig. 5; - Fig. 7A, close-up of the circled detail from Fig. 7; - Fig. 8 a sectional view of part of this embodiment with some omitted parts according to the same section plane Fig. 6; - Fig. 9 a front-end bearing and two protective elements of the bearing, belonging to the rotating assembly from the preceding figures and shown in section; - Fig. 10 the components from Fig. 9 in section and in an exploded view to highlight some features of these components; - Fig. 11 the components from Fig. 9 in a perspective view; - Fig. 12 the components from Fig. 9 in a perspective view and in an exploded view to highlight some features of these components.

[0025] In the Fig. 1 and Fig. Reference numeral 2 denotes a possible exemplary embodiment of a rotary unit as described. In the following, the term "rotary unit" refers to this possible embodiment of rotary unit 1.

[0026] The rotating assembly comprises at least one mounting body 2. The mounting body 2 is preferably manufactured from a single piece. The mounting body 2 is manufactured from a single piece, preferably by means of at least one forming phase. This forming phase includes inserting the material of the body 2 into a tool. The material of the body 2 is preferably a plastic material. The material of the body 2 could, for example, be a thermoplastic material. The forming phase could, for example, be an injection molding phase. During this forming phase, the material of the body 2 could be inserted into the tool under pressure. This pressure could also be high.

[0027] The forming phase is preferably a single forming phase.

[0028] The rotary unit 1 comprises a rotary system 4. The rotary system 4 is designed such that the rotary unit 1 is rotatable and therefore such that the rotary unit 1 has the aforementioned rotary function.

[0029] The rotation system 4 is designed to connect the body 2 to a frame of the cart and thus to define a connected state of the body 2 with the frame of the cart. The rotation system 4 is designed to rotate the body 2 relative to the frame of the cart and around a vertical axis of rotation V while the body 2 is in this connected state with the frame. The vertical axis of rotation V is defined as being perpendicular to a moving surface during operation. This moving surface is to be considered as a surface on which the cart can be moved during normal use by means of at least the rotation unit 1.

[0030] The assembly 1 comprises at least one first wheel 3a. The assembly 1 comprises at least one second wheel 3b. Both the first wheel 3a and the second wheel 3b are supported by the body 2, allowing them to rotate relative to the body 2 and about a horizontal axis H. This horizontal axis H is considered to be operationally parallel to this moving surface S.

[0031] The rotation of the wheels around the horizontal axis H contributes to the movement of the carriage on the moving surface, while the assembly 1 assumes the state of connection with the carriage frame. Both the first wheel 3a and the second wheel 3b are mounted on the body 2 in such a way that they are effectively connected to the aforementioned rotation of the body 2 around the vertical axis V and to the carriage frame.

[0032] The horizontal axis of rotation H is in the Fig. 3 and Fig. 4 and in the Fig. 5 indicated. Fig. 5 is located on a plane perpendicular to the plane of the Fig. 3 and to the level of Fig. 4.

[0033] It should be noted that the vertical axis of rotation V can be considered parallel to a direction that is effectively vertical in operation, and that the horizontal axis of rotation H can be considered parallel to a direction that is effectively horizontal in operation. The vertical and horizontal directions are arranged transversely and preferably at right angles to each other.

[0034] The rotation system 4 includes a vertical pivot 41. The vertical pivot 41 is inserted into the body 2, thus defining the vertical axis V for operational purposes. The vertical pivot 41 is positioned such that the vertical axis V is spaced apart from the horizontal axis H. In this way, the rotation unit 1 is rotatable, since, given that at least part of the weight of the carriage is transferred to the rotation unit along the vertical axis V, a lever arm is defined between the contact point of each wheel 3a or 3b with the moving surface and the vertical axis V, which enables the body 2 to rotate correctly around the vertical axis V with the wheels 3a and 3b.

[0035] The rotation system 4 includes an end-face bearing 42. The end-face bearing 42 defines or has an axis of rotation R of the bearing 42. The axis of rotation R is exemplified in the Fig. 9, Fig. 11 and Fig. 12 are given.

[0036] The end-face bearing 42 is positioned such that the axis R of the bearing 42 coincides with the vertical axis V. This alignment can be seen from the comparison between the Fig. 6A and Fig. 11 can be derived.

[0037] The end-face bearing 42 comprises at least one inner ring 421. The inner ring 421 is arranged around the axis R of the bearing 42. The end-face bearing 42 comprises one outer ring 422. The outer ring 422 is arranged around the axis R of the bearing 42. If the bearing 42 is a ball or roller bearing, as shown in the accompanying figures, the channel for the sliding of the balls or rollers is defined between the inner ring 421 and the outer ring 422. The inner ring 421 limits the extent of the channel in a radial direction relative to and towards the axis R of the bearing 42. The outer ring 422 limits the extent of the channel in a radial direction relative to and away from the axis R of the bearing 42. This is particularly evident in the Fig. 9, Fig. 10, Fig. 11 to Fig. 12 to be seen.

[0038] The radial direction relative to the axis of rotation R of the bearing 42 is understood to be a direction that is perpendicular to the axis of rotation R of the bearing 42.

[0039] The outer ring 422 is clamped to the body 2 by means of the forming phase, so that the outer ring 422 is firmly connected to the body 2 during the rotation of the body 2 around the vertical axis V. The clamping of the outer ring 422 to the body 2 is achieved by positioning the bearing 42 accordingly in the tool with which the forming phase is carried out. The clamping of the outer ring 422 to the body 2 corresponds to an integration of the outer ring 422 into the body 2.

[0040] The outer ring 422 of the end-face bearing 42 is clamped in the body 2 by means of the forming phase and / or integrated into it, so that the bearing 42 remains essentially clamped relative to the body 2 during its normal use, subject to the possibility of its components rotating as a result of the forming phase.

[0041] The inner ring 421 is clamped to the vertical pin 41, so that the inner ring 421 is firmly connected to the vertical pin 41 during the rotation of the body 2 about the vertical axis V. In this way, the end-face bearing 42 allows and / or causes and / or guides the aforementioned rotation of the body 2 about the vertical axis V.

[0042] The inner ring 421 defines a first radial outer surface 421a of the bearing 42. The first radial outer surface 421a faces the axis R of the bearing 42. The first radial outer surface 421a is in the Fig. 6A, Fig. 10, Fig. 11 and Fig. 12 are given.

[0043] The outer ring 422 defines a second radial outer surface 422a of the bearing 42. The second radial outer surface 422a is oriented away from the axis R of the bearing 42. The second radial outer surface 422a is in the Fig. 6A, Fig. 10, Fig. 11 and Fig. 12 are given.

[0044] The term “radial surface” means that the surface delimits the end-face bearing 42 along a radial direction to the axis R.

[0045] The first radial outer surface 421a can be considered a first outer side surface of the bearing 42. The second radial outer surface 422a can be considered a second outer side surface of the bearing 42. The first and second outer side surfaces are oriented from opposite sides to the radial direction mentioned above.

[0046] The bearing 42 defines at least one first outer intermediate surface 423 of the bearing 42. The first outer intermediate surface 423 extends from the first radial surface 421a to the second radial surface 422a.

[0047] The unit 1 includes at least one first protective element 5a.

[0048] The first protective element 5a is clamped to the body 2 and to the outer ring 422 of the bearing 42 by means of the forming phase.

[0049] The first protective element 5a is clamped to the body 2 by positioning it accordingly in the tool used for the forming process. This clamping action corresponds to the integration of the first protective element 5a into the body 2. Therefore, the first protective element 5a is clamped to and / or integrated into the body 2 by means of the forming process, so that it remains clamped to the body 2 as a result of the forming process.

[0050] The first protective element 5a is positioned between the end-face bearing 42 and the material of the body 2 during the forming phase, so that during the forming phase the material is prevented from penetrating the end-face bearing 42 through the first outer intermediate surface 423.

[0051] The first protective element 5a takes up essentially the same position in the manufactured rotary unit 1 as it did during the forming phase.

[0052] The first protective element 5a is ring-shaped, as can be seen in the Fig. 10, Fig. 11 and Fig. Figure 12 shows that the first protective element 5a is arranged around the vertical pin 41 and / or the vertical axis V, as shown in the Fig. 6 and Fig. 6A can be determined.

[0053] The first protective element 5a could, for example, be a disc.

[0054] The bearing 42 defines at least one second outer intermediate surface 424 of the bearing 42. The second outer intermediate surface 424 extends from the first radial surface 421a to the second radial surface 422a. The second outer intermediate surface 424 is oriented and / or arranged on the opposite side compared to the first outer intermediate surface 423.

[0055] The first outer intermediate surface 423 can be considered an outer upper surface of the bearing 42. The second outer intermediate surface 424 can be considered an outer lower surface of the bearing 42. The upper outer surface and the lower outer surface are oriented by opposing parts in a direction parallel to the axis of rotation R of the bearing 42.

[0056] The unit 1 includes at least one second protective element 5b.

[0057] The second protective element 5b is clamped to the body 2 and to the bearing 42 by means of the forming phase.

[0058] The fixed clamping of the second protective element 5b to the body 2 is achieved by positioning the second protective element 5b accordingly in the tool used for the forming phase. The fixed clamping of the second protective element 5b to the body 2 corresponds to the integration of the second protective element 5b into the body 2.

[0059] Therefore, the second protective element 5b is clamped in this body 2 by means of the forming phase and / or integrated into it, so that the second protective element 5b remains clamped to the body 2 as a result of the forming phase.

[0060] The second protective element 5b is positioned between the bearing and the material of the body 2 during the forming phase, so that during the forming phase the material is prevented from penetrating into the bearing through the second outer intermediate surface 424.

[0061] The second protective element 5b occupies essentially the same position in the manufactured rotary unit 1 as it did during the forming phase.

[0062] The second protective element 5b is ring-shaped, as can be seen in the Fig. 10, Fig. 11 and Fig. 12 can be seen. The second protective element 5b is arranged around the vertical pin 41 and / or the vertical axis V, which is shown in the Fig. 6 and Fig. 6A can be determined.

[0063] The second protective element 5b could, for example, be a disc.

[0064] The body 2 comprises an end-face section 21. This end-face section 21 defines a bore 211. Inserting the vertical pin 41 into the body corresponds to positioning the vertical pin in the bore 211. The bore 211 extends along a development axis that, in operational terms, coincides with the vertical axis V.

[0065] It must be taken into account that, as a result of the forming phase, the end-face bearing 42 is practically arranged in a seat that is arranged around the bore 211. The bore 211 and the seat S are in the Fig. Figure 8 shows the end face section 21 without the rotation system, without the protective elements, and without the end face bearing. The seat S has a bottom wall B. The seat S has a depth extension, which is to be understood as the extension of the seat S in a perpendicular direction to the development axis of the bore 211 and / or in a perpendicular direction to the bottom surface B. The development axis of the bore 211 effectively coincides with the vertical axis V and / or with the axis R of the end face bearing 42. This depth extension, which can also be referred to as the depth of the seat, is shown in the Fig. 8 indicated with E.

[0066] The first protective element 5a and the second protective element 5b ensure that an increased seat depth S can be achieved during the forming phase. Due to the protective elements 5a and 5b, the seat S can extend beyond the outer ring 422 of the bearing 42, starting from its bottom wall B. Otherwise, the seat depth would be limited because, during the forming phase, there is a high risk of the body 2 material penetrating the bearing 42 through the first outer intermediate surface 423 and / or the second outer intermediate surface 424, particularly due to the material pressure, which can be high. Specifically, without the protective elements 5a and 5b, the tool would have to be designed so that this depth does not exceed the extent of the outer ring 422 of the end-face bearing 42 in the same direction.An insufficient depth E of the seat S poses a serious risk that the bearing 42 may be dislodged from the seat S during use due to the bending effect that can be exerted on the rotating unit 1 by the distance between the vertical axis V and the horizontal axis H. In any case, malfunctions of the bearing 42 may occur due to possible deformations caused by this bending effect. The protective elements 5a and 5b therefore ensure that the tool can be designed so that the aforementioned depth E of the seat S can be greater after the forming phase, thus significantly reducing the aforementioned risk of the end-face bearing 42 dislodging and / or malfunctioning.

[0067] The vertical pin comprises a head 411 and a shaft 412. The shaft 412 extends along a development axis that coincides with the vertical axis V during operation. The shaft 412 extends through the end-face bearing 42 and, in particular, through the inner ring 421 of the bearing 42. The shaft 412 also extends through the first protective element 5a. The shaft 412 also extends through the second protective element 5b.

[0068] A locking element 43 is connected around the shaft 412 and is positioned on the opposite side of the bearing 42 compared to the head 411 of the pin 41.

[0069] Body 2 includes a central section 22. The central section 22 is inserted between the first wheel 3a and the second wheel 3b. The central section 22 is in the Fig. 6 and Fig. 7 is given.

[0070] The body 2 comprises a first pivot section 26, around and / or on which the first wheel 3a is mounted. The first pivot section 26 acts as a pivot or hub for the rotation of the first wheel 3a around the horizontal axis H. This situation is exemplified in the Fig. 7 and Fig. 7A can be seen.

[0071] Body 2 includes a second pivot section 27, around and / or on which the second wheel 3b is mounted. The second pivot section 27 acts as a pivot or hub for the rotation of the second wheel 3b around the horizontal axis H. This situation is exemplified in the Fig. 7 and Fig. 7A can be seen.

[0072] The first tenon section 26 and the second tenon section 27 extend from the central section 22. The first tenon section 26 and the second tenon section 27 extend from opposite sides of the central section 22. This is particularly evident in the Fig. 7 and Fig. 7A can be seen.

[0073] The first tenon section 26 extends, with respect to body 2, projecting from the central section 22. The second tenon section 27 extends, with respect to body 2, projecting from the central section 22 and from the opposite side to the first tenon section 26.

[0074] To structurally connect the end section 21 and the central section 22, the body 2 extends between the wheels 3a and 3b. Since the pivot sections 26 and 27 extend from the central section 22 and the body 2 extends between the wheels 3a and 3b to structurally connect the end section 21 and the central section 22, this avoids the need to connect the end section 21 to the pivot sections 26 and 27 from the outside, as is the case with existing rotary assemblies that include a fork connected to the opposite ends of the pivot from the outermost side of the respective wheel.

[0075] This significantly reduces the complexity of the components located on the respective outer surfaces of the wheels, thus considerably reducing the risk of thread-like elements and / or other foreign bodies present on the moving surface wrapping around the rotating unit, for example around the fork of existing rotating units, thereby avoiding the disadvantages due to the entanglement of these elements.

[0076] Body 2 includes an intermediate section 23. This intermediate section 23 is in the Fig. 6, Fig. 6A and Fig. 7 is given.

[0077] The central section 22 and the end section 21 are structurally connected by means of the intermediate section 23 of the body 2. The intermediate section 23 is positioned between the wheels 3a and 3b, such that the end section 21 supports the central section 22 by means of the insertion of the intermediate section 23. The intermediate section 23 is positioned such that it defines the specified distance between the specified vertical axis of rotation V and the specified horizontal axis of rotation H.

[0078] In order to structurally connect the end-face section 21 and the middle section 22, the body 2 defines the intermediate section 23.

[0079] The intermediate section 23 ensures that the end-face section 21, as already mentioned, does not need to be connected to the pivot sections 26 and 27 from the outside of each respective wheel. The first wheel 3a and the second wheel 3b are each mounted around the respective pivot section 26 or 27 by means of a respective mounting bearing 26a or 27a and a respective fastening element 26b or 27b.

[0080] For each wheel 3a or 3b, the respective mounting bearing 26a or 27a is inserted between the respective wheel 3a or 3b and the respective pin section 26 or 27 to allow the rotation of the respective wheel 3a or 3b around the horizontal axis H.

[0081] For each wheel 3a or 3b, the respective fastening element 26b or 27b is clamped in the respective pin section 26 or 27 to hold the respective mounting bearing 26a or 27a pressed against the body 2. This situation is in the Fig. 7A is visible.

[0082] For each wheel 3a or 3b, the respective fastening element 26b or 27b can, for example, be a screw whose head presses on the inner ring of the respective mounting bearing 26a or 27a, and whose shaft is clamped in the respective pin section 26 or 27.

[0083] Body 2 includes a blocking section 24. According to the representation in Fig. 4 The rotary unit 1 is designed such that the insertion of the wheels 3a and 3b into the respective grooves G1 and G2 of a mobile floor F corresponds to the contact of the locking section 24 on a supporting element that is inserted between the grooves G1 and G2. In this way, the automatic clamping of the rotary unit 1 on the mobile floor F is achieved when the respective wheels 3a and 3b engage in the respective grooves G1 and G2.

[0084] In Fig.4 includes the supporting element that is inserted between the grooves G1 and G2, the projections P1 and P2.

[0085] The body 2 includes a barrier section 25, which is arranged to prevent any material collected by the body 2 on the moving surface during the movement of the carriage from entering the area between the wheels 3a and 3b.

[0086] Body 2 could also not consist of a single piece, although in the illustrated embodiment it is a single piece. In any case, body 2 is preferably a single piece, as this simplifies the method for manufacturing the rotating assembly.

[0087] In general, it is possible that at least the end section 21, the middle section 22, the first tenon section 26 and the intermediate section 23 are integrated in a single piece.

[0088] In general, it is possible that at least the end-face section 21, the middle section 22, the first pin section 26, the second pin section 27, and the intermediate section 23 are integrated into this single piece. This single piece is manufactured by means of the aforementioned forming process. The forming process is preferably a single forming process.

[0089] In the illustrated embodiment, the end-face section 21, the central section 22, the first pin section 26, the second pin section 27, the intermediate section 23, the barrier section 25, and the blocking section 24 are integrated into this single piece. This single piece is manufactured by means of the aforementioned forming process. The forming process is preferably a single forming process.

[0090] The special arrangement of the first tenon section 26 and the second tenon section 27, which are oriented away from the central section 22 and from the respective oppositely arranged parts of the central section 22, facilitates the realization of the body 2 in a single piece by means of the forming phase.

[0091] A manufacturing process as described is used to manufacture the rotary unit 1.

[0092] The manufacturing process includes the aforementioned forming phase. This forming phase is carried out such that the body 2 comprises the end section 21, the intermediate section 23, the central section 22, the blocking section 24, and the pin sections 26 and 27. The tool used during the forming phase is therefore designed for this purpose.

[0093] This forming phase is carried out in such a way that the protective elements 5a and 5b prevent the material of the body 2 from penetrating into the end-face bearing 42 during the forming phase.

[0094] A described rotary unit can be manufactured using a method that is less expensive than that used for currently known rotary units, and guarantees, with a considerably reduced mechanical complexity, the protection of the rotary unit from possible entanglement of thread-like elements on the rotary unit and the possible insertion of foreign material between the wheels.

[0095] Furthermore, a described rotary unit allows for an improvement in the load-bearing behavior of the rotary unit, as it is designed to be rotatable, but avoids the risk that the end-face bearing, which allows the rotary unit to be rotatable, will come out of its seat and / or become incorrectly positioned as a result of a bending effect caused by the distance between the vertical axis of rotation V and the horizontal axis H due to the weight of the carriage that loads the rotary unit.

Images