Multi-degree of freedom adjustment direction assembly

Abstract

The utility model discloses a kind of multi-degree-of-freedom adjusting direction assembly, including first cylinder, second cylinder, third cylinder, third cylinder is hinged in the top of base, first cylinder is installed with steering shaft, the upper end of steering shaft is stretched out first cylinder and steering wheel is connected upwards, first cylinder can be moved along second cylinder, third cylinder is installed with connecting shaft, the lower end of steering shaft is connected with the upper end of connecting shaft, output shaft is installed in base, the upper end of output shaft is connected with the lower end of connecting shaft, base is equipped with the first angle adjusting assembly for adjusting the angle of third cylinder, third cylinder is equipped with the second angle adjusting assembly for adjusting the angle of second cylinder, second cylinder is equipped with the positioning assembly for locking first cylinder.The utility model in the direction assembly can be adjusted height and multi-stage angle adjustment, realize steering wheel in same height has different angle adjustable, to meet the use demand of driver of different height and body feature.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering shafts, specifically to a multi-degree-of-freedom adjustable steering assembly. Background Technology

[0002] The steering assembly is the core component of a car's steering system, primarily controlling the vehicle's trajectory by changing the direction of the wheels through driver input. The driver directly controls the vehicle's direction by manipulating the steering wheel. Therefore, the steering wheel is the component most closely connected to the driver. However, due to differences in driver height, driving habits, and the need for varying steering wheel placement, frequent adjustments to the steering wheel's position are necessary. However, the tilt angle adjustment range of the steering assembly is limited, failing to meet the individualized needs of drivers of different sizes. Utility Model Content

[0003] Based on this, and in response to the above problems, this utility model provides a multi-degree-of-freedom adjustable direction assembly.

[0004] The objective of this utility model can be achieved through the following technical solutions: A multi-degree-of-freedom adjustable steering assembly includes a first column, a second column sleeved at the lower part of the first column, and a third column hinged to the lower end of the second column. The lower end of the third column is hinged to the top of a base. A rotatable steering shaft is installed inside the first column, and the upper end of the steering shaft extends upward from the first column and connects to a steering wheel. The first column can move up and down along the second column. A rotatable connecting shaft is installed inside the third column, and the lower end of the steering shaft extends downward into the second column and connects to the upper end of the connecting shaft. A rotatable output shaft is installed inside the base, and the upper end of the output shaft connects to the lower end of the connecting shaft. The base is provided with a primary angle adjustment component for adjusting the angle of the third column, and the third column is provided with a secondary angle adjustment component for adjusting the angle of the second column. The second column is provided with a positioning component for locking the first column.

[0005] By adopting the above technical solution, the steering wheel can be locked after height adjustment through the positioning component. By setting up multi-level angle adjustment components, the steering wheel tilt angle is expanded, so that the height and angle of the steering wheel can adapt to the different heights and operating habits of the driver, allowing the driver to be in a comfortable state during driving.

[0006] In a specific embodiment of this utility model: the first-stage angle adjustment assembly includes a first universal joint and a locking gas spring. A bracket is hinged to the top of the base. The lower end of the third column is mounted on the bracket. The first universal joint is located inside the bracket, with one end connected to the lower end of the connecting shaft and the other end connected to the upper end of the output shaft. The upper end of the locking gas spring is hinged to the outer wall of the third column and the lower end is hinged to the base. A foot pedal for controlling the locking gas spring is also installed on the base.

[0007] In a specific embodiment of this utility model: the outer side wall of the bracket has an outwardly protruding limiting block, and the top of the base has a limiting notch that cooperates with the limiting block, with the limiting block located within the limiting notch. Using this structure, the range of movement of the limiting block within the limiting notch determines the swing angle range of the third column relative to the base.

[0008] In a specific embodiment of this utility model: the secondary angle adjustment assembly includes a second universal joint, a first toothed block, a second toothed block, and a spring. A connector is fixedly connected to the bottom of the second column. An outer sleeve is fitted over the upper part of the third column. The connector is hinged to the outer sleeve. The second universal joint is located inside the connector, with one end connected to the lower end of the steering shaft and the other end connected to the upper end of the connecting shaft. The first toothed block is fixed to the outer wall of the connector. One end of the second toothed block is hinged to the outer wall of the outer sleeve and meshes with the first toothed block. The bottom surface of the second toothed block has a downwardly extending first protrusion. A spring seat is provided below the second toothed block. The upper surface of the spring seat has an upwardly extending second protrusion corresponding to the position of the first protrusion. The spring is fitted on the first and second protrusions, with its upper end abutting against the bottom surface of the second toothed block and its lower end abutting against the upper surface of the spring seat. It also includes an adjustment knob fixed to the second column and connected to the second toothed block for controlling the up and down swing of the second toothed block.

[0009] In a specific embodiment of this utility model: the second angle adjustment component further includes a tension spring, the upper end of which is connected to the connector and the lower end of which is connected to the outer sleeve.

[0010] In a specific embodiment of this utility model: the adjustment knob is fixed to the upper part of the second column by a knob bracket, and the knob bracket is composed of two semicircular parts connected by bolts.

[0011] In a specific embodiment of this utility model: the positioning component includes a friction plate and a locking bolt. The second column has an opening. The friction plate is placed in the opening and contacts the first column. The locking bolt is horizontally installed on the knob bracket. The end of the locking bolt is connected to the adjustment knob, and the front end abuts against the friction plate. Tightening the locking bolt makes the friction plate press against the first column.

[0012] In a specific embodiment of this utility model: the clamping surface of the friction plate is a curved surface adapted to the shape of the outer wall of the first cylinder.

[0013] In a specific embodiment of this utility model: the friction plate is made of wear-resistant material.

[0014] In a specific embodiment of this utility model: the first column is provided with a vertical guide groove, and the inner wall of the knob bracket has a protrusion extending inward into the guide groove at a position corresponding to the guide groove.

[0015] In summary, the steering assembly of this utility model can be height-adjusted and multi-level angle-adjusted, so that the steering wheel can be adjusted to different angles at the same height, thereby meeting the usage needs of drivers with different heights and body types. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the multi-degree-of-freedom adjustable direction assembly of this utility model; Figure 2 This is a rear view of the directional assembly of this utility model; Figure 3 This is a left view of the directional assembly of this utility model; Figure 4 It shows Figure 1 Enlarged view of point A in the middle; Figure 5 It shows Figure 1 Enlarged view of point B in the middle; Figure 6 It shows Figure 2 Sectional view at CC; Figure 7 This shows the second cylindrical sleeve fitted onto the first cylindrical sleeve; Figure 8 It shows Figure 7 Sectional view at point DD; Figure 9 It shows Figure 8 Enlarged view at point E in the middle; Figure 10 This shows the adjustment knob mounted on a knob bracket via a connecting assembly; Figure 11 This is a schematic diagram of the structure of the connecting component of this utility model; Figure 12 This is a schematic diagram of the structure of the knob bracket of this utility model; Figure 13 This is a schematic diagram of the structure of the friction plate of this utility model; Figure 14This shows that the cavity has protruding ridges; Figure 15 It shows the highest edge F of the rotating disk; Figure 16 This shows another perspective of the rotating disk; Figure 17 This is a structural schematic diagram of the hexagonal nut of this utility model. Figure 18 This is a structural schematic diagram of the U-shaped bracket of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 , Figure 2 and Figure 6 As shown, this utility model is a multi-degree-of-freedom adjustable direction assembly, including a first column cylinder 10, a second column cylinder 11, a third column cylinder 12, a steering shaft 13, a connecting shaft 14, an output shaft 15, and a base 16.

[0020] like Figure 2 As shown, the lower end of the third column 12 is hinged to the top of the base 16, and the upper end is hinged to the lower end of the second column 11. The second column 11 is sleeved on the lower part of the first column 10, and the first column 10 can move up and down along the second column 11.

[0021] like Figure 6 and Figure 8As shown, the steering shaft 13 is rotatably mounted inside the first column cylinder 10. The connecting shaft 14 is rotatably mounted inside the third column cylinder 12. The output shaft 15 is rotatably mounted inside the base 16. The upper end of the steering shaft 13 extends upward from the first column cylinder 10 and connects to the steering wheel, while the lower end extends downward into the second column cylinder 11 and connects to the upper end of the connecting shaft 14. The steering shaft 13 is divided into an upper section 131 and a lower section 132. A bearing 133 is installed inside the first column cylinder 10 near the upper opening. The upper end of the upper section 131 passes through the bearing 133, which supports the upper section 131, allowing it to rotate relative to the first column cylinder 10 without vertical movement. The lower section 132 is located inside the second column cylinder 11 and is a hollow structure with internal splines on its inner wall. The upper shaft 131 has an external spline on its root outer wall that mates with the internal spline, and the root of the upper shaft 131 is inserted into the lower shaft 132. When the steering wheel is turned, the upper shaft 131 rotates accordingly, causing the lower shaft 132 to rotate, while the first column cylinder 10 does not rotate. When the steering wheel height needs to be adjusted, the upper shaft 131 is pulled while holding the steering wheel, and the first column cylinder 10 and the upper shaft 131 can move up and down relative to the second column cylinder 11 with the steering wheel. The upper end of the output shaft 15 is connected to the lower end of the connecting shaft 14.

[0022] like Figure 1 As shown, a primary angle adjustment assembly 20 for adjusting the angle of the third column cylinder 12 is provided on the base 16.

[0023] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, in this embodiment, the primary angle adjustment assembly 20 includes a first universal joint 21 and a locking gas spring 22. A bracket 23 is hinged to the top of the base 16. The lower end of the third column 12 is mounted on the upper surface of the bracket 23. The first universal joint 21 is located inside the bracket 23, with one end connected to the lower end of the connecting shaft 14 and the other end connected to the upper end of the output shaft 15. The upper end of the locking gas spring 22 is hinged to the outer wall of the third column 12, and the lower end is hinged to the base 16. A foot pedal 24 connected to the locking gas spring 22 and used to control the locking gas spring is also mounted on the base 16. The foot pedal 24 and the locking gas spring 22 can be connected by a pull cable.

[0024] When the foot pedal 24 is pressed, the locking switch of the locking gas spring 22 is pulled via a cable, releasing the constraint of the locking switch. At this time, the length of the locking gas spring 22 can be adjusted. Since the third column cylinder 12 and the base are hinged through the bracket 23, the angle of the third column cylinder 12 relative to the base 16 can be adjusted. That is, the steering wheel can be gripped forward or backward to adjust to the target position. When the foot pedal 24 is released, the length of the locking gas spring 22 is locked, realizing the initial adjustment of the steering wheel angle. This locking gas spring is an existing technology product and can be purchased directly, so it will not be described in detail here.

[0025] like Figure 4 As shown, in order to control the maximum angle of relative rotation between the third column 12 and the base 16, in this embodiment, a limiting block 25 protruding outward is provided on the outer wall of the bracket 23. A limiting notch 26 that mates with the limiting block 25 is provided on the top of the base 16. The limiting block 25 is located within the limiting notch 26. The range of movement of the limiting block 25 within the limiting notch 26 determines the range of the forward and backward swing angle of the third column 12 relative to the base 16.

[0026] like Figure 1 As shown, a secondary angle adjustment assembly 30 for adjusting the angle of the second column 11 is provided on the third column 12.

[0027] like Figure 1 , Figure 5 and Figure 6 As shown, in this embodiment, the secondary angle adjustment assembly 30 includes a second universal joint 31, a first toothed block 32, a second toothed block 33, and a spring 34. A connector 35 is fixedly connected to the bottom of the second column 11. An outer sleeve 36 is fitted over the upper part of the third column 12. The connector 35 and the outer sleeve 36 are hinged together. The second universal joint 31 is located inside the connector 35, with one end connected to the lower end of the steering shaft 13 and the other end connected to the upper end of the connecting shaft 14. The first toothed block 32 is fixed to the outer wall of the connector 35. One end of the second toothed block 33 is hinged to the outer wall of the outer sleeve 36 and meshes with the first toothed block 32. The bottom surface of the second toothed block 33 has a downwardly extending first protrusion 331. A spring seat 37 is located below the second toothed block 33, and the upper surface of the spring seat 37 has an upwardly extending second protrusion 371 corresponding to the position of the first protrusion 331. Spring 34 is fitted onto the first protrusion 331 and the second protrusion 371, with its upper end abutting against the bottom surface of the second toothed block 33 and its lower end abutting against the upper surface of the spring seat 37. It also includes an adjustment knob 38 fixed to the second cylindrical tube 11 and connected to the second toothed block 33 for controlling the up-and-down swing of the second toothed block.

[0028] The aforementioned second universal joint 31 and first universal joint 21 enable sequential transmission of the steering shaft 13, connecting shaft 14, and output shaft 15 when they are at an angle.

[0029] Here, the other end of the adjusting knob 38 and the second toothed block 33 can be connected by a cable. When the adjusting knob 38 is rotated counterclockwise, the other end of the second toothed block 33 is pulled downwards, causing the second toothed block 33 to disengage from the first toothed block 32 and release the locked state. At this time, the spring 34 is compressed and stores energy. Since the second column cylinder 12 and the third column cylinder 12 are hinged to the outer sleeve 36 through the connector 35, by holding the steering wheel and pulling the second column cylinder 11, the second column cylinder 11 can swing forward or backward relative to the third column cylinder 12, thereby adjusting the steering wheel forward or backward to the target position. When the adjusting knob 38 is rotated clockwise, the cable no longer pulls the second toothed block 33 downwards. Under the elastic force of the spring 34, the second toothed block 33 moves upwards, thereby re-engaging with the first toothed block 32 and locking the second column cylinder 11, so that the second column cylinder 11 can no longer be adjusted by swinging forward or backward.

[0030] like Figure 1 and Figure 12 As shown, the adjustment knob 38 is secured to the upper part of the second column 11 via a knob bracket 381. The knob bracket 381 consists of two semicircular portions 382 fixed together by bolts 383.

[0031] like Figure 3 As shown, in this embodiment, the second angle adjustment assembly 30 further includes a tension spring 39. The upper end of the tension spring 39 is connected to the connector 35, and the lower end is connected to the outer sleeve 36.

[0032] like Figures 7-9 As shown, in this embodiment, the second column 11 is provided with a positioning component 40 for locking the first column 10. The positioning component 40 includes a friction plate 41 and a locking bolt 42. An opening 44 is provided on the second column 11. The friction plate 41 is placed in the opening 44 and contacts the first column 10. The locking bolt 42 is horizontally mounted on the knob bracket 381 and its end is connected to the adjustment knob 38. Its front end abuts against the friction plate 41. Tightening the locking bolt 42 causes the friction plate 41 to press against the first column 10, causing friction between the outer wall of the first column 10 and the inner wall of the second column 11, thereby locking the first column. The first column 10 cannot move up and down relative to the second column 11, thus locking the steering wheel height position.

[0033] When the adjustment knob 38 is rotated counterclockwise, the locking bolt 42 rotates, causing the locking bolt 42 to separate from the friction plate 41. This releases the friction plate 41 from its lock on the first column cylinder 10, preventing it from pressing against the inner wall of the second column cylinder 11. This allows the first column cylinder 10 to move up and down within the second column cylinder 11, thus adjusting the steering wheel height. When tightening is required, the locking bolt 42 presses against and pushes the friction plate 41 to securely lock the first column cylinder 10. During steering wheel height adjustment, only the height of the steering wheel and the first column cylinder 10 changes relative to the second column cylinder 11; the height position of the adjustment knob 38 on the second column cylinder 11 remains unchanged. The driver can operate blindly without visual confirmation, quickly completing the steering wheel height adjustment.

[0034] like Figure 13 As shown, in this embodiment, the clamping surface of the friction plate 41 is a curved surface adapted to the shape of the outer wall of the first cylindrical tube 10. This structure increases the friction between the friction plate and the first cylindrical tube, thereby improving clamping performance.

[0035] In this embodiment, the friction plate 41 is made of a wear-resistant material. This extends the service life of the friction plate.

[0036] like Figure 3 and Figure 12 As shown, in this embodiment, a vertical guide groove 45 is provided on the first cylindrical tube 10. A protrusion 46 extending inward into the guide groove is located on the inner wall of the knob bracket 381 at a position corresponding to the guide groove 45. During assembly, the protrusion 46 of the knob bracket 381 is embedded in the guide groove 45 of the first cylindrical tube 10. This structure allows the first cylindrical tube to move up and down vertically, but prevents rotation of the first cylindrical tube.

[0037] like Figure 9 , Figure 10 , Figure 11 , Figures 16-18As shown, in this embodiment, the adjustment knob 38 is connected to the knob bracket 381 via a connecting assembly 50. This connecting assembly includes a rotating disk 51, a U-shaped bracket 52, a mounting plate 53, a hexagonal nut 56, and a locking nut 57. The adjustment knob 38 is fixed to the mounting plate 53 by multiple bolts. One of the semicircular portions 382 of the knob bracket 381 has a receiving cavity 54 capable of accommodating the rotating disk 51. The rotating disk 51 is located within this receiving cavity 54. A rotation notch 55 communicating with the outside is located on the side of the receiving cavity 54. The rotating disk 51 has an internal hexagonal hole 512 inside, and a side hole 511 corresponding to the position of the rotation notch 55 on the side, which communicates with the internal hexagonal hole 512, which is a through hole. The inner plate 521 of the U-shaped bracket 52 extends from the rotating notch 55, passes through the side hole 511 of the rotating disk 51, and is inserted into the internal hexagonal hole 512. The outer plate 522 is connected to the mounting plate 53. The outer surface of the outer plate 522 is welded to the mounting plate 53. The inner plate 521 of the U-shaped bracket 52 has a hexagonal hole 523 coaxial with the internal hexagonal hole 512 at the position of the internal hexagonal hole 512. The outer plate 522 has a through hole 524 coaxial with the hexagonal hole 523. The inner edge of the hexagonal nut 56 has a retaining edge 561, and its rear end extends from the inner end of the internal hexagonal hole 512 and is engaged in the hexagonal hole 523. The mounting plate 53 has a through hole 531 coaxial with the through hole 524. During assembly, the locking bolt 42 is installed in the through hole 531. The rear end of the locking bolt 42 extends out of the through hole 531 and is threadedly connected to the locking nut 57. The front end passes through the through hole 531, the through hole 524, and the hexagonal nut 56 in sequence, and then abuts against the friction plate 41. The locking bolt 42 is threadedly connected to the hexagonal nut 56. The hexagonal hole 512 of the rotating disk and the hexagonal hole 523 of the inner side plate 521 are both fitted onto the hexagonal nut 56. In this way, the U-shaped bracket 52, the rotating disk 51, the locking bolt 42, and the mounting plate 53 are assembled together by locking the locking nut 57 and the hexagonal nut 56. Rotating the adjustment knob 38 causes the mounting plate 53 to rotate, which in turn causes the U-shaped bracket 52 to rotate, which in turn causes the rotating disk 51 to rotate, thereby causing the hexagonal nut 56 and the locking bolt 42 to rotate together. The U-shaped bracket 52 is stopped by the upper and lower end faces 551 of the rotation notch 55 to limit the rotation angle of the U-shaped bracket and the adjustment knob. Figure 14 and Figure 15 As shown, the opposing surfaces between the rotating disk 51 and the receiving cavity 54 are configured as mutually cooperating rotating inclined surfaces. The rotating inclined surface of the receiving cavity 54 has a protruding ridge 541. Thus, when the highest edge F of the spiral inclined surface of the rotating disk 51 passes over the protruding ridge 541, the protruding ridge 541 will lock the rotating disk 51, preventing the rotating disk from loosening due to reverse rotation.

[0038] The above describes a multi-degree-of-freedom adjustable steering assembly. When adjusting the position of the steering wheel, pressing the foot pedal 24 pulls the locking switch of the locking gas spring 22, allowing adjustment of its length. Since the third column cylinder 12 and the base are hinged by the bracket 23, the angle between the third column cylinder 12 and the base 16 can be adjusted. By holding the steering wheel forward or backward to the target position and releasing the foot pedal 24, the length of the locking gas spring 22 is locked, achieving initial adjustment of the steering wheel angle.

[0039] Then, rotate the adjustment knob 38 counterclockwise, causing the mounting plate 53, U-shaped bracket 52, rotating disk 51, hexagonal nut 56, and locking bolt 42 to rotate together. During this process, the rotating inclined surface of the rotating disk 51 cooperates with the rotating inclined surface of the receiving cavity 54, causing the mounting plate 53, locking bolt 42, rotating disk 51, and hexagonal nut 56 to move axially away from the friction plate 41, thereby releasing the pressure of the friction plate 41 on the first column cylinder 10, allowing the first column cylinder 10 to move up and down. The driver can then adjust the height of the steering wheel by gripping it and lifting or pressing it down. At the same time, the counterclockwise rotating adjustment knob will pull the pull rope, causing the other end of the second tooth block 33 to swing downward, disengaging the second tooth block 33 from the first tooth block 32 and releasing the locking state. The spring 34 is compressed and stores energy. Since the second column cylinder 12 and the third column cylinder 12 are hinged together with the outer sleeve 36 through the connector 35, by gripping the steering wheel and moving the second column cylinder 11, the second column cylinder 11 can swing forward or backward relative to the third column cylinder 12, thereby further adjusting the angle position of the steering wheel.

[0040] After the steering wheel position is adjusted, rotate the adjustment knob 38 clockwise to rotate the mounting plate 53, U-shaped bracket 52, rotating disk 51, hexagonal nut 56, and locking bolt 42 together. The rotating ramp of the rotating disk 51 rotates upward along the rotating ramp of the receiving cavity 54, thereby causing the mounting plate 53, locking bolt 42, rotating disk 51, and hexagonal nut 56 to move axially toward the friction plate 41. The front end of the locking bolt 42 presses against the friction plate 41, pressing it against the first column cylinder to lock the first column cylinder 10. During this process, the pull cable is released, so that the pull cable no longer pulls the second tooth block 33 downward. The spring 34 releases its elasticity, pushing the second tooth block 33 upward, so that it re-engages with the first tooth block 32 to lock the second column cylinder 11.

[0041] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A multi-degree-of-freedom adjustable steering assembly, comprising a first column, a second column sleeved at the lower part of the first column, and a third column hinged to the lower end of the second column, the lower end of the third column being hinged to the top of a base; a rotatable steering shaft is installed inside the first column, the upper end of the steering shaft extending upward from the first column and connected to a steering wheel; the first column is capable of moving up and down along the second column; a rotatable connecting shaft is installed inside the third column, the lower end of the steering shaft extending downward into the second column and connected to the upper end of the connecting shaft; a rotatable output shaft is installed inside the base, the upper end of the output shaft being connected to the lower end of the connecting shaft, characterized in that... The base is provided with a primary angle adjustment component for adjusting the angle of the third column, the third column is provided with a secondary angle adjustment component for adjusting the angle of the second column, and the second column is provided with a positioning component for locking the first column.

2. The multi-degree of freedom adjustment direction assembly according to claim 1, characterized in that, The first-stage angle adjustment assembly includes a first universal joint and a locking gas spring. A bracket is hinged to the top of the base. The lower end of the third column is mounted on the bracket. The first universal joint is located inside the bracket, with one end connected to the lower end of the connecting shaft and the other end connected to the upper end of the output shaft. The upper end of the locking gas spring is hinged to the outer wall of the third column and the lower end is hinged to the base. A foot pedal for controlling the locking gas spring is also installed on the base.

3. The multi-degree of freedom adjustment direction assembly of claim 2, wherein, The outer side wall of the bracket has an outwardly protruding limiting block, and the top of the base has a limiting notch that cooperates with the limiting block, with the limiting block located within the limiting notch.

4. The multi-degree of freedom adjustment direction assembly of claim 1, wherein, The secondary angle adjustment assembly includes a second universal joint, a first toothed block, a second toothed block, and a spring. A connector is fixed to the bottom of the second column, and an outer sleeve is fitted onto the upper part of the third column. The connector is hinged to the outer sleeve. The second universal joint is located inside the connector, with one end connected to the lower end of the steering shaft and the other end connected to the upper end of the connecting shaft. The first toothed block is fixed to the outer wall of the connector. One end of the second toothed block is hinged to the outer wall of the outer sleeve and meshes with the first toothed block. The bottom surface of the second toothed block has a downwardly extending first protrusion. A spring seat is provided below the second toothed block. The upper surface of the spring seat has an upwardly extending second protrusion corresponding to the position of the first protrusion. The spring is fitted onto the first and second protrusions, with its upper end abutting against the bottom surface of the second toothed block and its lower end abutting against the upper surface of the spring seat. The assembly also includes an adjustment knob fixed to the second column and connected to the second toothed block for controlling the up-and-down swing of the second toothed block.

5. The multi-degree of freedom adjustment direction assembly of claim 4, wherein, It also includes a tension spring, the upper end of which is connected to the connector and the lower end of which is connected to the outer sleeve.

6. The multi-degree of freedom adjustment direction assembly of claim 4, wherein, The adjustment knob is secured to the upper part of the second cylinder by a knob bracket, which consists of two semicircular parts connected by bolts.

7. The multi-degree of freedom adjustment direction assembly of claim 6, wherein, The positioning component includes a friction plate and a locking bolt. The second column has an opening, the friction plate is placed in the opening and contacts the first column, and the locking bolt is horizontally installed on the knob bracket. The end of the locking bolt is connected to the adjustment knob, and the front end abuts against the friction plate. Tightening the locking bolt makes the friction plate press against the first column.

8. The multi-degree of freedom adjustment direction assembly of claim 7, wherein, The friction pads are made of wear-resistant materials.

9. The multi-degree of freedom adjustment direction assembly of claim 7, wherein, The first column is provided with a vertical guide groove, and the inner wall of the knob bracket has a protrusion extending inward into the guide groove at the position corresponding to the guide groove.

10. The multi-degree of freedom adjustment direction assembly of claim 7, wherein, The adjustment knob is connected to the knob bracket via a connecting assembly, which includes a rotating disk, a U-shaped bracket, a mounting plate, and a hexagonal nut. One of the semicircular portions has a cavity for accommodating the rotating disk, which is located within the cavity. The cavity has a rotation notch on its side. The inner end of the U-shaped bracket extends into the cavity through the rotation notch and connects to the rotating disk. The outer end of the bracket is connected to the mounting plate. The adjustment knob is fixed to the mounting plate with bolts. The rotating disk has an internal hexagonal hole, which is a through hole. The hexagonal nut is installed in the internal hexagonal hole. The mounting plate has a through hole coaxial with the internal hexagonal hole. A locking bolt is installed in the through hole, with its rear end extending out of the through hole and threadedly connected to the locking nut. The front end passes through the through hole and the hexagonal nut in sequence and abuts against the friction plate. The locking bolt is threadedly connected to the hexagonal nut. The opposing surfaces between the rotating disk and the cavity are configured as mutually cooperating rotating inclined surfaces.

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