Novel pallet structure capable of being folded for storage and convenient to carry

Abstract

The invention relates to the technical field of goods stacking, and discloses a novel pallet structure capable of being folded for storage and convenient to carry, the novel pallet structure comprises a pallet body and handrail assemblies installed on the two sides of the upper end of the pallet body, a lengthening assembly is installed on the front side of the pallet body, and pulley assemblies are installed at the four corners of the inner side of the pallet body. By changing the distance between the supporting part and the pallet body in the lengthening assembly, the length of the whole pallet structure can be adjusted, so that stacking of different goods is met; goods placed on the pallet body can be protected through the handrail assembly, the length of the handrail assembly is adjustable so that different goods can be protected, meanwhile, the handrail assembly can be detached and folded, and high flexibility is achieved; the pallet body and the lengthening assembly can be supported by supporting pulleys in the pulley assembly on the ground, so that the whole pallet structure can be conveniently rotated, and the practicability is good.

Description

Technical Field

[0001] This invention relates to the field of cargo stacking technology, specifically a novel pallet structure that is foldable, easy to store, and convenient to transport. Background Technology

[0002] A pallet is a platform device used for stacking and transporting goods. Its main function is to consolidate scattered goods into unitized goods, which facilitates mechanized operations. By working with forklifts, cranes and other handling equipment, pallets can enable the rapid handling and loading / unloading of goods, improving logistics efficiency. Pallets usually use standardized sizes and specifications, which makes logistics operations more standardized and regulated, helps reduce human error and repetitive work, and lowers logistics costs.

[0003] Chinese patent discloses a pallet box with movable inner material (authorization announcement number CN104843281B). This patented technology can realize four-way movement of the pallet, which is simple and safe to operate, greatly reduces costs, and has a relatively simple structure. It can also be applied to automated parking garages to improve parking density and efficiency. However, while it enables bidirectional movement of the inner material on the plane of the base frame and allows for flexible adjustment of the inner material's position and layout, and standardization of storage and transportation packaging pallets for different specifications of products, thus greatly improving the versatility of the pallet box, it cannot fold and store the end frames, nor can it adjust the size of the pallet box, resulting in poor flexibility. Summary of the Invention

[0004] The purpose of this invention is to provide a novel pallet structure that is foldable, easy to store, and convenient to transport, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A novel foldable and easily transportable pallet structure includes a pallet body and railing assemblies installed on both sides of the upper end of the pallet body. An extension assembly is installed on the front side of the pallet body, and pulley assemblies are installed at the four corners of the inner side of the pallet body. The pulley assembly includes a pulley, a guide sleeve is fixedly connected to the front side of the upper end of the pulley, and a nut pair is fixedly connected to the rear side of the upper end of the pulley. A lead screw is engaged through the inner side of the nut pair, a driven bevel gear is fixedly connected to the lower end of the outer side of the lead screw, a driving bevel gear is engaged with the outer side of the driven bevel gear, a second rotating shaft is fixedly connected to one end of the driving bevel gear, an external hexagonal nut is fixedly connected to one end of the second rotating shaft, and a guide rod is slidably connected to the inner side of the guide sleeve.

[0007] As a further embodiment of the present invention: a bearing is installed on the outer side of the rotating shaft two between the external hexagonal nut and the driving bevel gear; bearing seats are installed at the top and bottom of the lead screw; and a pulley hole is opened on the inner side of the pallet body near the lower end of the pulley.

[0008] As a further embodiment of the present invention: the railing assembly includes a set of outer tubes, and an inner tube is slidably connected to the upper end of the inner side of each outer tube. The upper ends of the set of inner tubes are connected to a hand-operated crossbar. Several fastening sleeves are sleeved on the outer side of each outer tube and inner tube. A protective crossbar is fixedly connected between every two fastening sleeves in the same horizontal direction, and a fastening screw is embedded in the inner side of each fastening sleeve.

[0009] As a further embodiment of the present invention: a fixing head is rotatably connected to the inner side of the lower end of each outer tube via a fastening shaft, and a positioning head is fixedly connected to the lower end of each fixing head. Mounting grooves are provided at the four corners of the upper end of the pallet body, and the positioning head is embedded in the corresponding mounting groove. The fixing head is fixedly connected to the pallet body by screws.

[0010] As a further embodiment of the present invention: a button is slidably mounted on the upper end of the pull bar, a connecting strip is fixedly connected to the lower end of the button, a pull rod is fixedly connected to both sides of the lower end of the connecting strip inside the inner tube, a pressing head is fixedly connected to the bottom of each pull rod, a transverse slide rail is embedded in the bottom of the inner tube, a moving block is slidably connected to the upper end of the transverse slide rail, a limit post is fixedly connected to one end of the moving block, and a spring is installed at the other end of the moving block, a sliding groove is inclinedly opened on the front and rear sides of the moving block, a sliding column is slidably connected to the inner side of each sliding groove, a slider is installed on the outer side of each sliding column, and the upper ends of the two sliders are connected to the pressing head.

[0011] As a further embodiment of the present invention: a vertical slide rail is fixedly connected to the rear end of the inner wall of the inner tube, the slider is slidably connected to the vertical slide rail, the limiting post slides through the inner side of the inner tube, and a plurality of limiting holes are opened at one end of the outer side of the outer tube in the vertical direction.

[0012] As a further embodiment of the present invention: the connecting strip is located inside the hand-operated crossbar, and a set of springs is installed between the connecting strip and the hand-operated crossbar.

[0013] As a further embodiment of the present invention: the extended component includes a support portion and a plurality of extension portions fixedly connected to the upper rear side of the support portion. All of the extension portions are slidably connected to the front side of the pallet body, and a rack is installed at the bottom of one of the extension portions. A gear is meshed with the lower outer end of the rack. A rotating shaft is fixedly connected to one end of the gear, and an internal hexagonal nut is fixedly connected to one end of the rotating shaft.

[0014] As a further embodiment of the present invention: a plurality of positioning holes and spring posts are respectively provided at the upper and lower ends of the outer sides of each of the extended portions located on the left and right sides; the inner side of the pallet body is provided with spring posts and positioning holes corresponding to the positioning holes and spring posts; and a bearing is installed on the inner side of the rotating shaft between the gear and the internal hexagonal nut.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] This invention allows for adjustment of the entire pallet structure's length by changing the distance between the support portion and the pallet body in the extended assembly, thus accommodating the stacking of different goods. The railing assembly provides protection for goods placed on the pallet body; its length is adjustable to accommodate various cargo types, and it is also detachable and foldable, offering high flexibility. By supporting the pulleys in the pulley assembly on the ground, the pallet body and extended assembly can be raised, allowing for easy rotation of the entire pallet structure. When the pulleys are retracted, the pallet body and extended assembly rest on the ground, ensuring the stability of the entire pallet structure. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a novel pallet structure that is foldable, easy to store, and convenient to transport.

[0018] Figure 2 This is a structural diagram of the pallet body and the extension component in a novel pallet structure that is foldable, easy to store, and convenient to transport.

[0019] Figure 3 This is a schematic diagram of the extended component in a novel foldable, storable, and easily transportable pallet structure.

[0020] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle section;

[0021] Figure 5 This is a schematic diagram of the railing assembly in a novel pallet structure that is foldable, easy to store, and convenient to transport.

[0022] Figure 6 This is a partial cross-sectional view of the railing assembly in a novel foldable, storable, and easily transportable pallet structure.

[0023] Figure 7 for Figure 6 A magnified structural diagram of A in the middle;

[0024] Figure 8 This is a schematic diagram of the pulley assembly in a novel pallet structure that is foldable, easy to store, and convenient to transport.

[0025] In the diagram: 1. Pallet body; 2. Extension assembly; 21. Support section; 22. Extension section; 23. Positioning hole; 24. Spring post; 25. Gear; 26. Bearing 1; 27. Shaft 1; 28. Socket head cap nut; 29. ​​Rack; 3. Pulley assembly; 31. Pulley; 32. Driven bevel gear; 33. Shaft 2; 34. External hexagon nut; 35. Bearing 2; 36. Driven bevel gear; 37. Lead screw; 38. Bearing seat; 39. Nut pair; 310. Guide sleeve; 311. Guide rod; 4. Railing assembly; 41. Outer tube; 42. 43. Fastening sleeve; 44. Positioning head; 45. Protective crossbar; 46. Fixing head; 47. Fastening shaft; 48. Fastening screw; 49. Inner tube; 40. Hand pull crossbar; 410. Button; 411. Limiting hole; 412. Connecting strip; 413. Spring 1; 414. Pull rod; 415. Press head 1; 416. Press head 2; 417. Slider; 418. Sliding column; 419. Limiting column; 420. Slide groove; 421. Horizontal slide rail; 422. Moving block; 423. Spring 2; 424. Vertical slide rail; 5. Mounting groove; 6. Pulley hole. Detailed Implementation

[0026] Please see Figures 1-8 In this embodiment of the invention, a novel pallet structure that is foldable, easy to store and transport includes a pallet body 1 and railing assemblies 4 installed on both sides of the upper end of the pallet body 1. An extension assembly 2 is installed on the front side of the pallet body 1, and pulley assemblies 3 are installed at the four corners of the inner side of the pallet body 1.

[0027] exist Figure 2 , Figure 3 and Figure 4In the extended component 2, there is a support part 21 and several extension parts 22 fixedly connected to the upper rear side of the support part 21. All extension parts 22 are slidably connected to the front side of the pallet body 1. A rack 29 is installed at the bottom of one of the extension parts 22. A gear 25 is meshed with the lower outer end of the rack 29. A rotating shaft 27 is fixedly connected to one end of the gear 25. An internal hex nut 28 is fixedly connected to one end of the rotating shaft 27. By turning the internal hex nut 28 with a wrench, the internal hex nut 28 drives the rotating shaft 27 and the gear 25 to rotate together around the bearing 26. This causes the gear 25 to mesh with the rack 29, thereby pushing the rack 29 and causing the extension part 22 to slide along the front side of the pallet body 1. This changes the distance between the support part 21 and the pallet body 1, thereby adjusting the length of the entire pallet structure to accommodate the stacking of different goods. When the support part 21 is retracted into the pallet body 1... When tilted, the entire pallet structure forms a standardized size specification in the market, such as 800*1000mm, 800*1200mm, 1000*1200mm, 1200*1600mm or 1200*1800mm; each extension 22 on the left and right sides has several positioning holes 23 and spring posts 24 respectively at the upper and lower ends of its outer side; the pallet body 1 has corresponding spring posts and positioning holes for positioning holes 23 and spring posts 24. When the positioning holes 23 and spring posts 24 on the extension component 2 enter the corresponding spring posts and positioning holes in the pallet body 1, the pallet body 1 and the extension component 2 can be kept stable; a bearing 26 is installed on the inner side of the rotating shaft 27 between the gear 25 and the internal hexagonal nut 28. The bearing 26 is fixedly installed on the inner side of the pallet body 1, and the rotating shaft 27 and the gear 25 can rotate stably through the bearing 26.

[0028] exist Figure 1 , Figure 5 , Figure 6 and Figure 7In the middle, the guardrail assembly 4 includes a set of outer tubes 41, with an inner tube 48 slidably connected to the upper end of the inner side of each outer tube 41. The upper ends of the set of inner tubes 48 are connected to a hand-operated crossbar 49. Several fastening sleeves 42 are fitted onto the outer sides of each outer tube 41 and inner tube 48. A protective crossbar 44 is fixedly connected between every two fastening sleeves 42 in the same horizontal direction. A fastening screw 47 is embedded in the inner side of each fastening sleeve 42. After loosening the fastening screw 47 counterclockwise, the corresponding fastening sleeve 42 can slide along the outer tube 41 or inner tube 48, thereby allowing the protective crossbar 44 to be installed at different heights to achieve the purpose of protecting goods. The inner side of the lower end of each outer tube 41 is connected by a fastening shaft. The 46 rotating connection has a fixed head 45. After loosening the fastening shaft 46 counterclockwise, the guardrail assembly 4 can be folded and placed on the pallet body 1 to reduce space occupation. The lower end of each fixed head 45 is fixedly connected to a positioning head 43. The four corners of the upper end of the pallet body 1 are provided with mounting grooves 5. The positioning head 43 is embedded in the corresponding mounting groove 5 to achieve alignment and ensure the accuracy of the installation position. The fixed head 45 is fixedly connected to the pallet body 1 by screws. Therefore, when protecting the goods placed on the pallet body 1, the guardrail assembly 4 is installed on both sides of the upper end of the pallet body 1. Otherwise, the guardrail assembly 4 is removed and the goods are placed directly on the pallet body 1. The upper end of the hand-operated crossbar 49 is embedded with... A button 410 is slidably installed inside the inner tube 48. A connecting strip 412 is fixedly connected to the lower end of the button 410. A pull rod 414 is fixedly connected to both sides of the lower end of the connecting strip 412 inside the inner tube 48. A pressing head 415 is fixedly connected to the bottom of each pull rod 414. A transverse slide rail 421 is embedded in the bottom of the inner tube 48. A moving block 422 is slidably connected to the upper end of the transverse slide rail 421. A limit post 419 is fixedly connected to one end of the moving block 422, and a spring 423 is installed at the other end of the moving block 422. Sliding grooves 420 are inclinedly opened on the front and rear sides of the moving block 422. A sliding post 418 is slidably connected to the inner side of each sliding groove 420. A pressing head 415 is installed on the outer side of each sliding post 418. The device is equipped with a slider 417, and the upper ends of two sliders 417 are connected to a pressing head 416. The rear end of the inner wall of the inner tube 48 is fixedly connected to a vertical slide rail 424. The slider 417 is slidably connected to the vertical slide rail 424, so that the slider 417 can move up and down along the vertical slide rail 424. The limiting post 419 slides through the inner side of the inner tube 48. One end of the outer side of the outer tube 41 has several limiting holes 411 in the vertical direction. When the limiting post 419 is embedded in the limiting hole 411, the outer tube 41 and the inner tube 48 can be kept fixed. When the limiting post 419 leaves the limiting hole 411, the outer tube 41 and the inner tube 48 can slide relative to each other to adjust the length of the outer tube 41 and the inner tube 48.The connecting bar 412 is located inside the pull bar 49, and a set of springs 413 is installed between the connecting bar 412 and the pull bar 49. When the button 410 is released, the springs 413 extend, which can drive the button 410, connecting bar 412, pull rod 414 and pressing head 415 to reset together. The pressing head 415 then moves away from the pressing head 416, the springs 423 reset, and push the moving block 422 to the left along the transverse slide rail 421. The moving block 422 drives the limiting post 419 to move laterally, so that the limiting post 419 enters the corresponding limiting hole 411. At the same time, the sliding post 418 slides upward along the slide groove 420, which in turn causes the slider 417 to move upward along the vertical slide rail 424, so that the slider 417 moves to the upper part of the moving block 422, and the pressing head 416 resets.

[0029] exist Figure 2 and Figure 8 In the process, the pulley assembly 3 includes a pulley 31. A guide sleeve 310 is fixedly connected to the front side of the upper end of the pulley 31, and a nut pair 39 is fixedly connected to the rear side of the upper end of the pulley 31. A lead screw 37 is meshed through the inner side of the nut pair 39. A driven bevel gear 32 is fixedly connected to the lower outer side of the lead screw 37. A driving bevel gear 36 is meshed with the outer side of the driven bevel gear 32. A rotating shaft 33 is fixedly connected to one end of the driving bevel gear 36. An external hexagonal nut 34 is fixedly connected to one end of the rotating shaft 33. A guide rod 311 is slidably connected to the inner side of the guide sleeve 310. The guide rod 311 is fixedly installed inside the pallet body 1. A bearing 35 is installed on the outer side of the rotating shaft 33 between the external hexagonal nut 34 and the driving bevel gear 36. Bearing seats 38 are installed at both the top and bottom ends of the lead screw 37. Both the bearing 35 and the bearing seats 38 are installed inside the pallet body 1. The bearing seats 38 allow the lead screw to... 37 rotates stably; the second bearing 35 enables the second shaft 33 to rotate stably; a pulley hole 6 is provided on the inner side of the pallet body 1 near the lower end of the pulley 31. By turning the external hexagonal nut 34 with a wrench, the external hexagonal nut 34 drives the second shaft 33 and the driving bevel gear 36 to rotate together around the second bearing 35. The driving bevel gear 36 meshes with the driven bevel gear 32, thereby causing the lead screw 37 to rotate around the bearing seat 38, which in turn causes the nut pair 39 to move up and down along the lead screw 37, driving the pulley 31 and the guide sleeve 310 to move up and down along the guide rod 311. When the pulley 31 moves downward, it passes through the pulley hole 6 and can be supported on the ground, supporting the pallet body 1 and the extension component 2. At this time, the entire pallet structure can be rotated easily; when the pulley 31 is retracted upward, the pallet body 1 and the extension component 2 are supported on the ground, which ensures the stability of the entire pallet structure.

[0030] When the goods are large and the standard-sized pallets on the market cannot be fully stacked, the internal hex nut 28 is turned by wrench. The internal hex nut 28 drives the rotating shaft 27 and the gear 25 to rotate around the bearing 26. This causes the gear 25 to mesh with the rack 29 and push the rack 29, so that the extension 22 slides along the front side of the pallet body 1. This changes the distance between the support part 21 and the pallet body 1, thereby adjusting the length of the entire pallet structure to accommodate larger goods.

[0031] The working principle of this invention is as follows: When the goods are relatively loose and need to be protected on both sides of the goods placed on the pallet body 1 to prevent slippage or tipping, the positioning head 43 in the railing assembly 4 is inserted into the corresponding mounting groove 5 on the pallet body 1; then, the fixing head 45 is fixed to the pallet body 1 with screws; then, the button 410 is installed by hand, the button 410 presses the spring 413 downward, and at the same time the pull rod 414 and the pressing head 415 move downward together, the pressing head 415 pushes the pressing head 416 and the slider 417 downward, the slider 417 slides down along the vertical slide rail 424, so that the sliding column 418 slides down along the slide groove 420, thereby making The moving block 422 slides to the right along the transverse slide rail 421 and compresses the second spring 423. At this time, the limiting post 419 also slides to the right and exits from the corresponding limiting hole 411. Then, the hand-pulled crossbar 49 is lifted upward, which drives the inner tube 48 to move upward. When the inner tube 48 moves to the appropriate height, the button 410 is released, and the hand-pulled crossbar 49 is lifted upward again, so that the limiting post 419 enters the corresponding limiting hole 411, and the outer tube 41 and the inner tube 48 can be kept stable. Then, the fastening screw 47 is loosened, and the position of the corresponding fastening sleeve 42 on the inner tube 48 is adjusted, so that the two sides of the goods can be protected by the railing assembly 4.

[0032] When it is necessary to move the pallet to a suitable position, the external hex nut 34 is turned by wrench. The external hex nut 34 drives the rotating shaft 33 and the driving bevel gear 36 to rotate around the bearing 35. The driving bevel gear 36 meshes with the driven bevel gear 32, thereby causing the lead screw 37 to rotate around the bearing seat 38. This causes the nut assembly 39 to move up and down along the lead screw 37, driving the pulley 31 and the guide sleeve 310 to move up and down along the guide rod 311. When the pulley 31 moves downward, it passes through the pulley hole 6 and can be supported on the ground, supporting the pallet body 1 and the extension assembly 2. At this time, the entire pallet structure can be easily rotated.

[0033] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A novel foldable and easily transportable pallet structure, comprising a pallet body (1) and railing assemblies (4) installed on both sides of the upper end of the pallet body (1), characterized in that, An extension assembly (2) is installed on the front side of the pallet body (1), and pulley assemblies (3) are installed at the four corners of the inner side of the pallet body (1). The pulley assembly (3) includes a pulley (31), a guide sleeve (310) is fixedly connected to the front side of the upper end of the pulley (31), and a nut pair (39) is fixedly connected to the rear side of the upper end of the pulley (31). A lead screw (37) is meshed through the inner side of the nut pair (39). A driven bevel gear (32) is fixedly connected to the lower end of the outer side of the lead screw (37). A driving bevel gear (36) is meshed to the outer side of the driven bevel gear (32). A rotating shaft (33) is fixedly connected to one end of the driving bevel gear (36). An external hexagonal nut (34) is fixedly connected to one end of the rotating shaft (33). A guide rod (311) is slidably connected to the inner side of the guide sleeve (310).

2. The novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 1, characterized in that, A bearing 2 (35) is installed on the outer side of the rotating shaft 2 (33) between the external hexagonal nut (34) and the driving bevel gear (36). A bearing seat (38) is installed at the top and bottom of the lead screw (37). A pulley hole (6) is opened on the inner side of the pallet body (1) near the lower end of the pulley (31).

3. The novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 1, characterized in that, The railing assembly (4) includes a set of outer tubes (41), and an inner tube (48) is slidably connected to the upper end of the inner side of each outer tube (41). The upper ends of the set of inner tubes (48) are connected to a hand-operated crossbar (49). Several fastening sleeves (42) are sleeved on the outer side of each outer tube (41) and inner tube (48). A protective crossbar (44) is fixedly connected between every two fastening sleeves (42) in the same horizontal direction. A fastening screw (47) is embedded in the inner side of each fastening sleeve (42).

4. The novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 3, characterized in that, Each of the outer tubes (41) has a fixed head (45) rotatably connected to the inner side of its lower end via a fastening shaft (46). Each fixed head (45) has a positioning head (43) fixedly connected to its lower end. The four corners of the upper end of the pallet body (1) are provided with mounting grooves (5). The positioning head (43) is embedded in the corresponding mounting groove (5). The fixed head (45) is fixedly connected to the pallet body (1) by screws.

5. A novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 3, characterized in that, A button (410) is slidably mounted on the upper end of the hand-operated crossbar (49). A connecting strip (412) is fixedly connected to the lower end of the button (410). A pull rod (414) is fixedly connected to both sides of the lower end of the connecting strip (412) inside the inner tube (48). A pressing head (415) is fixedly connected to the bottom of each pull rod (414). A transverse slide rail (421) is embedded in the bottom of the inner tube (48). A movable sliding head is slidably connected to the upper end of the transverse slide rail (421). The movable block (422) has a limit post (419) fixedly connected to one end, and a spring (423) installed at the other end. The movable block (422) has inclined grooves (420) on both the front and rear sides. A sliding column (418) is slidably connected to the inner side of each groove (420), and a slider (417) is installed on the outer side of each sliding column (418). The upper ends of the two sliders (417) are connected to a pressing head (416).

6. A novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 5, characterized in that, The inner wall of the inner tube (48) is fixedly connected to a vertical slide rail (424), the slider (417) is slidably connected to the vertical slide rail (424), the limiting post (419) slides through the inner side of the inner tube (48), and one end of the outer side of the outer tube (41) is provided with several limiting holes (411) in the vertical direction.

7. A novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 5, characterized in that, The connecting bar (412) is located inside the hand-pull crossbar (49), and a set of springs (413) is installed between the connecting bar (412) and the hand-pull crossbar (49).

8. A novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 1, characterized in that, The extension component (2) includes a support part (21) and several extension parts (22) fixedly connected to the rear side of the upper end of the support part (21). All the extension parts (22) are slidably connected to the front side of the pallet body (1), and a rack (29) is installed at the bottom of one of the extension parts (22). A gear (25) is meshed with the lower end of the outer side of the rack (29). A rotating shaft (27) is fixedly connected to one end of the gear (25), and an internal hexagonal nut (28) is fixedly connected to one end of the rotating shaft (27).

9. A novel pallet structure that is foldable, easy to store, and convenient to transport according to claim 8, characterized in that, Several positioning holes (23) and spring posts (24) are respectively provided on the upper and lower ends of the outer side of each of the extensions (22) located on the left and right sides. The inner side of the pallet body (1) is provided with spring posts and positioning holes corresponding to the positioning holes (23) and spring posts (24). The inner side of the rotating shaft (27) is provided with a bearing (26) between the gear (25) and the internal hexagonal nut (28).

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