Knob assembly

Abstract

A knob assembly is assembled on a shell to drive a rotating shaft arranged in the shell, the shell comprises a groove and a through hole, the through hole is located in the groove, and the rotating shaft penetrates through the through hole. The knob assembly comprises a packing ring, a sliding piece and a knob. The packing ring is arranged in the groove and is aligned with the through hole. The sliding piece comprises a through hole, a release groove and a packing groove. The releasing groove and the packing groove are arranged adjacently, and the diameter of the releasing groove is larger than that of the packing groove. The sliding piece is arranged on the shell in a sliding mode, so that the packing ring is contained in the releasing groove or the packing groove. The rotary knob comprises a rotary disc and a center shaft, and the center shaft is connected with the rotary disc, sequentially penetrates through the through hole of the sliding piece and the packing ring to the penetrating hole and is sleeved on the rotary shaft. When the sliding part moves from the releasing position to the locking position, the packing ring moves from the releasing groove to the packing groove, so that the packing ring tightly wraps the central shaft of the knob to position the knob.

Description

Technical Field

[0001] The present disclosure relates to a knob assembly, and more particularly to a knob assembly with a locking structure. Background Art

[0002] Common knob assemblies can be divided into stepless and segmented types. Stepless knob assemblies usually have no node control and can be used for precise fine-tuning. Segmented knob assemblies generally have a spring or buckle design and are mostly used for fixed function selection. The traditional way of using a knob assembly is to directly connect the knob assembly to the encoder axis, and the encoder can be driven when the knob assembly is turned. However, stepless knob assemblies can usually be precisely fine-tuned but cannot fix the position of the knob assembly, which can easily cause inaccurate settings due to machine movement or vibration. Although segmented knob assemblies have a locking function, they cannot be fine-tuned. Summary of the invention

[0003] An object of the present invention is to provide a knob assembly to solve at least one of the above problems.

[0004] In view of the above, the present disclosure provides, in one embodiment, a knob assembly which is assembled in a housing to drive a rotating shaft arranged in the housing, wherein the housing includes a groove and a through hole, the through hole is located in the groove, and the rotating shaft is arranged in the through hole. The knob assembly includes a clamping ring, a sliding member, and a knob. The clamping ring is arranged in the groove and is opposite to the through hole. The sliding member includes a through hole, a release groove, and a clamping groove. The release groove and the clamping groove are arranged adjacent to each other and are interconnected, and the diameter of the release groove is greater than the diameter of the clamping groove. The sliding member is slidably arranged in the housing so that the clamping ring is accommodated in the release groove or the clamping groove. The knob includes a turntable and a central shaft, the central shaft is connected to the turntable and passes through the through hole and the clamping ring of the sliding member to the through hole in sequence and is sleeved on the rotating shaft. When the sliding member moves from the release position to the locking position, the clamping ring moves from the release groove to the clamping groove, so that the clamping ring tightly covers the central shaft of the knob to position the knob.

[0005] According to one embodiment of the present invention, the housing further includes a first positioning portion located in the groove, and the sliding member further includes a second positioning portion, and the second positioning portion is suitable for correspondingly moving away from or contacting the first positioning portion based on the sliding of the sliding member.

[0006] According to one embodiment of the present invention, when the sliding member moves from the releasing position to the locking position, the second positioning portion moves from being away from the first positioning portion to being in contact with the first positioning portion.

[0007] According to one embodiment of the present invention, the housing further includes a third positioning portion located in the groove and between the first positioning portion and the through hole. When the sliding member is in the release position, the second positioning portion contacts the third positioning portion.

[0008] According to one embodiment of the present invention, the central axis extends along a first direction, the sliding member moves in a second direction, the length of the release groove in a third direction is greater than the length of the clamping groove in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0009] According to one embodiment of the present invention, the shell further includes a plurality of protrusions extending toward the groove in the third direction; the sliding member further includes a plurality of sliding buckle portions extending outward in the third direction, and when the sliding member moves to the release position, the plurality of sliding buckle portions are located below the plurality of protrusions.

[0010] According to one embodiment of the present invention, the sliding member further includes a first stop portion and a second stop portion, which are located on two opposite sides in the second direction. When the sliding member is in the release position, the turntable abuts against the first stop portion, and when the sliding member is in the locking position, the turntable abuts against the second stop portion.

[0011] According to one embodiment of the present invention, the tightening ring further includes a ring member and two protruding members, and the two protruding members are disposed on two opposite sides of the ring member along the third direction.

[0012] According to one embodiment of the present invention, the ring has an opening, so that the ring forms a non-closed ring, and the opening is located between the two protruding parts.

[0013] According to one embodiment of the present invention, the clamping ring has an opening, so that the clamping ring forms a non-closed ring.

[0014] According to one embodiment of the present invention, the groove has a limiting groove and a limiting rib, the outer circumference of the clamping ring has a groove, the limiting groove is arranged around the through hole, the limiting rib is arranged in the limiting groove, the clamping ring is arranged in the groove, and the groove is correspondingly penetrated through the limiting rib.

[0015] Thus, after the knob of the knob assembly has completed the desired rotation setting, the slider can be operated to move to the locking position so that the clamping ring fixes the knob and the knob cannot be easily rotated, thereby achieving the positioning effect. In this way, the function of the stepless knob assembly for precise fine-tuning can be retained, and the position of the adjusted knob assembly can be fixed to avoid the problem of setting inaccuracy caused by movement or vibration of the device or machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a three-dimensional diagram of a knob assembly mounted on a housing in a release position according to an embodiment of the present invention.

[0017] Figure 2 The figure is an exploded view of the knob assembly, the housing and the shaft according to an embodiment of the present disclosure.

[0018] Figure 3 The present invention is a three-dimensional diagram showing a clamping ring assembled to a housing according to an embodiment of the present invention.

[0019] Figure 4 The present invention is a three-dimensional diagram showing a sliding member being assembled to a housing according to an embodiment of the present invention.

[0020] Figure 5 The slide member is in the release position according to an embodiment of the present disclosure. Figure 1 A partial cross-sectional view of the relative positional relationship between the second positioning portion and the first positioning portion, as viewed from the AA cross-sectional line.

[0021] Figure 6 The slide member is in the release position according to an embodiment of the present disclosure. Figure 1 Partial cross-sectional view of the BB, with the clamping ring located in the release groove.

[0022] Figure 7 The present invention is a three-dimensional diagram showing a knob assembly assembled on a housing in a locked position according to an embodiment of the present invention.

[0023] Figure 8 The present invention discloses an embodiment of the sliding member in the locking position. Figure 7 A partial cross-sectional view of the relative positional relationship between the second positioning portion and the first positioning portion, as viewed from the CC cross-sectional line.

[0024] Fig. 9 The present invention discloses an embodiment of the sliding member in the locking position. Figure 7 Partial cross-sectional view of the clamping ring located in the clamping groove, as viewed from the DD cross-sectional view.

[0025] The reference numerals are as follows:

[0026] 100: Knob assembly

[0027] 10: Clamping ring

[0028] 11: Rings

[0029] 111: Opening

[0030] 12: Protruding parts

[0031] 13: Groove

[0032] 20: Sliding parts

[0033] 21:Through hole

[0034] 211: First End

[0035] 212: Second End

[0036] 22: Second positioning part

[0037] 23: Release slot

[0038] 24: tightening groove

[0039] 25: Slide buckle

[0040] 26: First stopper

[0041] 27: Second stopper

[0042] 28: Extension arm

[0043] 30: Knob

[0044] 31: Turntable

[0045] 32: Central axis

[0046] 70: Circuit board

[0047] 71: Encoder

[0048] 80: Shaft

[0049] 90: Shell

[0050] 91: Groove

[0051] 911: Limiting slot

[0052] 912: Limiting rib

[0053] 92: first positioning portion

[0054] 93:Piercing

[0055] 94: protrusion

[0056] 95: Third positioning part

[0057] X: First direction

[0058] Y: Second direction

[0059] Z: Third direction DETAILED DESCRIPTION

[0060] The following embodiments are provided for detailed description, however, the embodiments are only used as examples and do not limit the scope of the present disclosure. In addition, some elements are omitted in the drawings in the embodiments to clearly show the technical features of the present disclosure. The same reference numerals will be used to represent the same or similar elements in all drawings.

[0061] Please read first Figure 1 and Figure 2 , Figure 1 A three-dimensional diagram of a knob assembly in a release position provided on a housing according to an embodiment of the present disclosure; Figure 21 is an exploded view of a knob assembly, a housing, and a rotating shaft according to an embodiment of the present disclosure. The knob assembly 100 is assembled in the housing 90 to drive the rotating shaft 80 disposed in the housing 90. The housing 90 includes a groove 91 and a through hole 93, and the through hole 93 is located in the groove 91. The rotating shaft 80 is penetrated through the through hole 93. Among them, the rotating shaft 80 can be, for example, a rotating shaft for rotation adjustment of an encoder, or a rotating shaft of other components that are operated by rotation. In this embodiment, the rotating shaft 80 of the encoder 71 assembled on the circuit board 70 is used as an example, and the circuit board 70 is disposed on the inner side of the housing 90. The rotating shaft 80 protrudes from the inner side of the housing 90 through the through hole 93 to the outer side of the housing 90, so that the knob assembly 100 can be assembled for operation.

[0062] The knob assembly 100 includes a clamping ring 10, a sliding member 20 and a knob 30. Figures 3 to 6 , Figure 3 This is a three-dimensional diagram showing the assembly of a clamping ring to a housing according to an embodiment of the present disclosure; Figure 4 This is a three-dimensional diagram showing a sliding member assembled to a housing according to an embodiment of the present disclosure; Figure 5 The slide member is in the release position according to an embodiment of the present disclosure. Figure 1 A partial cross-sectional view showing the relative positional relationship between the second positioning portion and the first positioning portion, as viewed from the AA cross-sectional line; Figure 6 The present disclosure shows an embodiment of the sliding member in the release position. Figure 1 The BB section view shows a partial cross-sectional view of the clamping ring located in the release groove. Figure 3 It can be seen that the clamping ring 10 is disposed in the groove 91 and is aligned with the through hole 93. The sliding member 20 includes a through hole 21, a release groove 23 and a clamping groove 24. Figure 4 and Figure 6 It can be seen that the release groove 23 and the clamping groove 24 are adjacently arranged and interconnected, the release groove 23 and the clamping groove 24 are located below the through hole 21, and the diameter of the release groove 23 is larger than the diameter of the clamping groove 24. The sliding member 20 is slidably arranged on the housing 90, so that the clamping ring 10 is accommodated in the release groove 23 (such as Figure 6 as shown) or the clamping groove 24 (as shown Fig. 9 as shown, and described in detail later).

[0063] See also Figure 2 and Figure 5 The knob 30 includes a turntable 31 and a central shaft 32 . The central shaft 32 is connected to the turntable 31 , and passes through the through hole 21 of the sliding member 20 and the clamping ring 10 to the through hole 93 in sequence, and is sleeved on the rotating shaft 80 .

[0064] Next, how to lock the knob 30 after the operation is completed will be described to prevent the knob 30 from rotating due to improper touch. Figures 4 to 9 , Figure 7A three-dimensional diagram showing a knob assembly assembled on a housing in a locked position according to an embodiment of the present disclosure; Figure 8 The present invention discloses an embodiment of the sliding member in the locking position. Figure 7 A partial cross-sectional view showing the relative positional relationship between the second positioning portion and the first positioning portion as viewed from the CC cross-sectional line; Fig. 9 The present invention discloses an embodiment of the sliding member in the locking position. Figure 7 Partial cross-sectional view of the clamping ring located in the clamping groove, as viewed from the DD cross-sectional view.

[0065] When the knob assembly 100 is assembled, Figure 5 It can be seen that the sliding member 20 is in the release position at this time. Figure 6 It can be seen that at this time, the clamping ring 10 is located in the release groove 23 and the clamping ring 10 loosely surrounds the central axis 32 of the knob 30. Here, loosely surrounding means that the clamping ring 10 surrounds the central axis 32 but does not contact the central axis 32 at all, or partially contacts but is not completely tightly connected, or surrounds and completely contacts but is not tightly connected, so that the central axis 32 maintains a state of being able to rotate relative to the clamping ring 10. In this state, the user can operate the dial 31 of the knob 30 from the outside of the housing 90 to rotate the shaft 80 to a desired position.

[0066] Afterwards, when the user completes the operation and wants to fix the knob 30 at the adjusted position so that the rotary disk 31 no longer rotates relatively, the user can operate the sliding member 20 to move from the release position to the locking position. Figure 1 and Figure 7 As shown, the user can push the sliding member 20 to move to the right side of the figure to move the sliding member 20 to the locking position. When the sliding member 20 moves to the locking position, as shown in FIG. Fig. 9 As shown, the movement of the sliding member 20 causes the release groove 23 originally corresponding to the clamping ring 10 to move to the right, and the clamping groove 24 to move to the position of the clamping ring 10, so that the clamping ring 10 moves from the release groove 23 to the clamping groove 24 and squeezes the clamping ring 10, so that the clamping ring 10 tightly covers the central axis 32 of the knob 30 to position the knob 30.

[0067] The above-mentioned tight covering means that the clamping ring 10 is tightly attached to the central shaft 32 circumferentially, or partially tightly attached to the central shaft 32 , so that the central shaft 32 cannot rotate relative to the clamping ring 10 due to the clamping and friction force of the clamping ring 10 .

[0068] Thus, after the knob 30 of the knob assembly 100 has completed the desired rotation setting, the slider 20 can be operated to move to the locking position so that the clamping ring 10 fixes the knob 30 and the knob 30 cannot be easily rotated, thereby achieving the positioning effect. In this way, the function of the stepless knob assembly 100 for precise fine-tuning can be retained, and the position of the adjusted knob assembly 100 can be positioned to avoid the problem of missetting the setting due to movement or vibration of the device or machine. When the knob 30 is to be operated again, it is only necessary to reversely operate the slider 20 to release the lock of the knob 30, and the knob 30 can be operated again for rotation adjustment.

[0069] Next, see Figure 2 and Figure 3 The housing 90 further includes a first positioning portion 92 located in the groove 91. The sliding member 20 further includes a second positioning portion 22 which moves away from the first positioning portion 92 or contacts the first positioning portion 92 as the sliding member 20 slides. Figure 5 and Figure 8 As shown, when the sliding member 20 moves from the release position to the locking position, the second positioning portion 22 moves from being away from the first positioning portion 92 to being in contact with the first positioning portion 92 .

[0070] Here, the second positioning portion 22 is correspondingly far away from the first positioning portion 92, which means that the two are not in contact. For example, in this embodiment, the first positioning portion 92 is a concave portion, and the second positioning portion 22 is a convex portion. Figure 5 As shown, when the convex part of the second positioning part 22 is not accommodated in the concave part of the first positioning part 92, it is far away. The second positioning part 22 contacts the first positioning part 92, which means that the two are connected to each other. Figure 8 As shown, in this embodiment, it means that the convex part of the second positioning part 22 is accommodated in the concave part of the first positioning part 92. In other positioning part modes, the first positioning part can also be a convex part and the second positioning part can be a concave part. In this case, the above definition of contact or distance also applies.

[0071] During this process, when the second positioning portion 22 and the first positioning portion 92 are in contact, the user can also feel the operation to confirm that the sliding member 20 has been operated to the locked position. In addition, in addition to the contact positioning of the second positioning portion 22 and the first positioning portion 92, the side wall of the groove 91 can also be used for positioning. Figure 8 As shown, the second positioning portion 22 can be connected to an extension arm 28 having a certain length. When the sliding member 20 moves to the locking position, the extension arm 28 abuts against the right side wall of the groove 91. In this way, the movable space of the sliding member 20 can be limited, and the user can be provided with a hand feeling feedback that the operation is in place.

[0072] Please see again Figure 2 , Figure 3 and Figure 5The housing 90 further includes a third positioning portion 95 located in the groove 91 and between the first positioning portion 92 and the through hole 93. When the sliding member 20 is in the release position, the second positioning portion 22 can contact the third positioning portion 95. The third positioning portion 95 can provide the sliding member 20 with a release position (such as Figure 4 Move the group to the release position (as shown) Figure 5 The operating feel when the knob 30 is in the state of being pressed (as shown) can be checked to confirm whether the sliding member 20 has been moved to the release position and the knob 30 can be further assembled.

[0073] Depend on Figure 2 and Figure 5 It can be seen that the central axis 32 extends along the first direction X. Figure 1 and Figure 7 It can be seen from the operation that the sliding member 20 moves in the second direction Y. In addition, Figure 4 It can be seen that the length of the release groove 23 in the third direction Z is greater than the length of the clamping groove 24 in the third direction Z. In this embodiment, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Therefore, the clamping ring 10 is provided with a clamping and squeezing force in the third direction Z by reducing the length in the third direction Z.

[0074] Depend on Figure 2 and Figure 4 It can be seen that the housing 90 further includes a plurality of protrusions 94 extending and protruding toward the groove 91 in the third direction Z. The sliding member 20 further includes a plurality of sliding buckles 25 extending and protruding in the third direction Z. When the sliding member 20 is to be assembled into the groove 91, the plurality of sliding buckles 25 of the sliding member 20 can be first aligned with the position without the protrusion 94, for example Figure 4 As shown in FIG. 1 , the slider 25 of the sliding member 20 is aligned with the left side position of the protrusion 94 on the left side. At this time, the slider 25 of the sliding member 20 can move into the groove 91 without being blocked by the protrusion 94. After the slider 25 of the sliding member 20 passes the protrusion 94, the sliding member 20 can move in the groove 91 along the second direction Y. Figure 1 As shown, when the sliding member 20 is assembled in the groove 91 and moves to the release position, the slider 25 will be located below the protrusion 94. At this time, under the relative limit of the slider 25 and the protrusion 94, the sliding member 20 can be restricted from moving away from the groove 91 in the first direction X. In addition, the length of the protrusion 94 is designed so that when the sliding member 20 is in the release position and the locking position, the slider 25 will be stopped by the protrusion 94. This ensures that the sliding member 20 will not move in the first direction X and leave the groove 91 during the entire stroke.

[0075] Next, please refer to Figure 2 , Figure 5 and Figure 8, the through hole 21 has a first end 211 and a second end 212 that are opposite to each other in the second direction Y. When the sliding member 20 is in the release position, such as Figure 5 As shown, the central axis 32 will abut against the first end 211. In this embodiment, when the sliding member 20 is in the release position, the first end 211 of the through hole 21 is approximately aligned with the right end of the through hole 93 of the housing 90. Figure 4 In the initial assembly position shown, the first end 211 of the through hole 21 will be located above the through hole 93 of the housing 90, so that the central shaft 32 cannot be assembled into the through hole 93. When the sliding member 20 is moved to the release position, the central shaft 32 can be inserted into the through hole 93. In addition, because the central shaft 32 abuts against the first end 211, the sliding member 20 can no longer move to the left along the second direction Y. Accordingly, the sliding member 20 can no longer move to the position where the slider portion 25 is not blocked by the protrusion 94 (i.e. Figure 4 Once the knob assembly 100 is assembled, the sliding member 20 cannot escape from the groove 91 along the first direction X as long as the knob 30 is not removed.

[0076] Then, if Figure 8 As shown, when the sliding member 20 is in the locked position, the central axis 32 will abut against the second end 212 to limit the movable range of the sliding member 20 and also provide the user with an operating feel to avoid excessive force.

[0077] Depend on Figure 2 It can be seen that the sliding member 20 further includes a first stopper 26 and a second stopper 27. The first stopper 26 and the second stopper 27 are located at two opposite sides in the second direction Y. Figure 1 As shown in FIG. 2 , when the sliding member 20 is in the release position, the rotating disk 31 abuts against the first stop portion 26. Figure 7 As shown, when the sliding member 20 is in the locked position, the rotating disk 31 abuts against the second stopper 27. In this embodiment, the first stopper 26 and the second stopper 27 are designed to be arc-shaped protrusions corresponding to the shape of the rotating disk 31. In other embodiments, any shape is also possible.

[0078] Then, by Figure 2 and Figure 3 It can be seen that the clamping ring 10 further includes a ring member 11 and two protruding members 12, and the two protruding members 12 are arranged on two opposite sides of the ring member 11 along the third direction Z. The shape of the clamping groove 24 will also change with the arrangement of the protruding members 12, and through the arrangement of the protruding members 12, the clamping groove 24 can be more easily pressed on the protruding members 12 from the third direction Z, so that the clamping ring member 11 is in close contact with the central axis 32 in the third direction Z.

[0079] In addition, the ring 11 has an opening 111, which makes the ring 11 form a non-closed ring, and the opening 111 is located between the two protruding parts 12. The opening 111 allows the ring 11 to retain a better elastic expansion space when it is squeezed. In addition, the ring 11 can more tightly wrap the central axis 32 after being squeezed.

[0080] Then, also by Figure 3 It can be seen that the groove 91 has a limiting groove 911 and a limiting rib 912. The limiting groove 911 is arranged around the through hole 93, and the limiting rib 912 is arranged in the limiting groove 911. When the clamping ring 10 is to be arranged in the groove 91, the center of the ring 11 can be aligned with the center of the through hole 93 under the limitation of the limiting groove 911. In addition, the outer circumference of the clamping ring 10 has a groove 13. When the clamping ring 10 is arranged in the groove 91, the groove 13 will be correspondingly penetrated in the limiting rib 912 to position the clamping ring 10 so that it will not rotate around the third direction Z as the axis.

[0081] In summary, after the desired rotation setting is completed, the knob 30 of the knob assembly 100 can be moved to the locking position by operating the sliding member 20, so that the clamping ring 10 fixes the knob 30 and the knob 30 cannot be easily rotated, thereby achieving the positioning effect. In this way, the function of the stepless knob assembly 100 for precise fine-tuning can be retained, and the position of the adjusted knob assembly 100 can be fixed to avoid the problem of missetting the setting due to movement or vibration of the device or machine. When the knob 30 is to be operated again, it is only necessary to reversely operate the sliding member 20 to release the lock of the knob 30, and the knob 30 can be operated again for rotation adjustment. Various positioning and limiting structures can also prevent the knob assembly 100 from falling off when the device or machine is moved, operated or tipped over, and no tools are required during the assembly process, thereby improving the assembly efficiency during production.

Claims

1. A knob assembly, assembled in a housing to drive a rotating shaft disposed in the housing, the housing comprising a groove and a through hole, the through hole being located in the groove, the rotating shaft being disposed in the through hole, characterized in that: The knob assembly includes: A clamping ring, disposed in the groove and aligned with the through hole; a sliding member, comprising a through hole, a release groove and a clamping groove, wherein the release groove and the clamping groove are adjacently arranged and communicated with each other, and the diameter of the release groove is larger than the diameter of the clamping groove, and the sliding member is slidably arranged on the housing so that the clamping ring is accommodated in the release groove or the clamping groove; and A knob, comprising a rotating disk and a central shaft, wherein the central shaft is connected to the rotating disk and sequentially passes through the through hole of the sliding member and the clamping ring to the through hole and is sleeved on the rotating shaft; When the sliding member moves from a releasing position to a locking position, the clamping ring moves from the releasing groove to the clamping groove, so that the clamping ring tightly covers the central axis of the knob to position the knob.

2. The knob assembly according to claim 1, characterized in that: The housing further comprises a first positioning portion located in the groove, and the sliding member further comprises a second positioning portion, and the second positioning portion is adapted to correspondingly move away from or contact the first positioning portion based on the sliding of the sliding member.

3. The knob assembly according to claim 2, characterized in that: When the sliding member moves from the release position to the locking position, the second positioning portion moves from being away from the first positioning portion to being in contact with the first positioning portion.

4. The knob assembly according to claim 2, characterized in that: The housing further comprises a third positioning portion, which is located in the groove and between the first positioning portion and the through hole. When the sliding member is at the release position, the second positioning portion contacts the third positioning portion.

5. The knob assembly according to claim 1, wherein: The central axis extends along a first direction, the sliding member moves in a second direction, the length of the release slot in a third direction is greater than the length of the clamping slot in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The knob assembly according to claim 5, characterized in that: The shell also includes a plurality of protrusions extending toward the groove in the third direction; the sliding member also includes a plurality of sliding buckle portions extending outward in the third direction, and when the sliding member moves to the release position, the plurality of sliding buckle portions are located below the plurality of protrusions.

7. The knob assembly according to claim 5, characterized in that: The sliding member also includes a first stop portion and a second stop portion, which are located on two opposite sides in the second direction. When the sliding member is in the release position, the turntable abuts against the first stop portion, and when the sliding member is in the locking position, the turntable abuts against the second stop portion.

8. The knob assembly according to claim 5, characterized in that: The tightening ring also includes a ring member and two protruding members, wherein the two protruding members are arranged on two opposite sides of the ring member along the third direction.

9. The knob assembly according to claim 8, characterized in that: The ring piece has an opening, so that the ring piece forms a non-closed ring shape, and the opening is located between the two protruding pieces.

10. The knob assembly according to claim 1, wherein: The tightening ring has an opening, so that the tightening ring forms a non-closed ring.

11. The knob assembly according to claim 1, wherein: The groove has a limiting groove and a limiting rib, the outer circumference of the clamping ring has a groove, the limiting groove is arranged around the through hole, the limiting rib is arranged in the limiting groove, the clamping ring is arranged in the groove, and the groove is correspondingly penetrated through the limiting rib.

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