Telescopic adjusting self-locking comb sleeve and hair trimmer

Abstract

The utility model relates to the field of hair trimming devices, and discloses a telescopic adjusting self-locking comb sleeve and a hair trimmer. The connecting shell is connected with the hair trimmer, the comb sleeve body is connected with the connecting shell in a sliding mode, the knob driving assembly is rotationally connected with the connecting shell so as to drive the comb sleeve body to move relative to the connecting shell, the elastic spring bolt assembly is used for locking the knob driving assembly which rotates by any angle, and an unlocking knob is arranged on the knob driving assembly. The knob driving assembly and the elastic spring bolt assembly are both movably connected with the unlocking knob. The unlocking knob is rotated to drive the elastic spring bolt assembly to unlock the knob driving assembly and drive the knob driving assembly to rotate so as to drive the comb sleeve body to be adjusted in a telescopic mode. The length of the comb sleeve can be adjusted only by rotating the unlocking knob, so that the operation is simple and convenient; the stability of the comb sleeve after length adjustment and self-locking is improved; the structure is compact and does not occupy too large space of the hair trimmer; the comb sleeve body can be detached and replaced, and maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the technical field of hair trimming devices, specifically to a telescopic adjustable self-locking comb cover and a hair trimmer. Background Technology

[0002] Hair trimmers are mainly used for trimming hair or body hair in daily life. Some hair trimmers are equipped with adjustable combs, which can be adjusted to leave different lengths of hair or body hair after trimming.

[0003] To prevent the comb from shifting due to force during hair or body hair trimming, existing hair trimmers are equipped with an adjustment device and a locking device. When adjusting the length of the comb extension, you need to first press the adjustment device to engage the locking device to lock the comb, and then rotate the adjustment device to drive the comb extension. After adjusting the extension length, release the adjustment device, and the adjustment device will automatically reset and the locking device will lock and limit the comb in this state.

[0004] During the above operation, when adjusting the length of the comb sleeve extension, it is necessary to first press the adjustment device to unlock the locking device, and then rotate the adjustment device to drive the extension of the comb sleeve. The operation is cumbersome and not convenient. Utility Model Content

[0005] To address at least one of the aforementioned problems, this utility model provides a telescopic adjustable self-locking comb cover, comprising a connecting shell, a comb cover body, a knob drive assembly, and an elastic locking tongue assembly. The connecting shell is adapted to be connected to a hair trimmer. The comb cover body is slidably connected to the connecting shell. The knob drive assembly is rotatably connected to the connecting shell to drive the comb cover body to move relative to the connecting shell. The elastic locking tongue assembly is slidably connected to the knob drive assembly or the connecting shell. The elastic locking tongue assembly is adapted to lock the knob drive assembly after rotation at any angle. The knob drive assembly is provided with an unlocking knob. Both the knob drive assembly and the elastic locking tongue assembly are movably connected to the unlocking knob.

[0006] When the unlocking knob rotates at a specific angle relative to the drive turntable, the unlocking knob drives the elastic locking tongue assembly to move to release the lock on the knob drive assembly, and drives the knob drive assembly to rotate synchronously to drive the comb body to extend and retract. When the unlocking knob is not rotated, the elastic locking tongue assembly locks the rotation of the knob drive assembly.

[0007] Optionally, the connecting shell is provided with a plurality of locking tooth grooves, which are arranged circumferentially at intervals in the knob drive assembly. The elastic locking tongue assembly includes a locking pin and an elastic drive member. The locking pin is slidably connected to the knob drive assembly and rotates synchronously with the knob drive assembly. The locking pin is adapted to be inserted into any one of the locking tooth grooves to lock the rotation of the knob drive assembly. The elastic drive member drives the locking pin to be inserted into the locking tooth groove.

[0008] Optionally, the locking pin is fixedly provided with a drive post, the unlocking knob is provided with an eccentric arc groove, the drive post is inserted into the eccentric arc groove, and the eccentric arc groove is adapted to drive the drive post to move when the unlocking knob rotates relative to the knob drive assembly so as to drive the locking pin to disengage from the locking tooth groove.

[0009] Optionally, a limiting protrusion is provided on one side of the groove wall of the eccentric arc groove. When the locking pin is inserted into the locking tooth groove, the end of the driving column located away from the rotation center of the limiting protrusion is radially moved and limited.

[0010] Optionally, the knob driving assembly includes a driving turntable rotatably connected to the connecting shell, an elastic locking tongue assembly slidably disposed on the driving turntable and rotating synchronously with the driving turntable, one end of the unlocking knob being sleeved on the driving turntable, the driving turntable being fixedly provided with a linkage protrusion, the unlocking knob being provided with a linkage slot, the linkage protrusion being inserted into the linkage slot, and the linkage protrusion being arranged at intervals with the slot wall of the linkage slot along the rotation direction of the driving turntable.

[0011] Optionally, the knob drive assembly further includes a drive gear and a drive plate. The drive gear is fixedly connected to the drive turntable, and the drive plate is detachably connected to the comb sleeve body. The drive plate is fixedly provided with a rack, and the rack meshes with the drive gear.

[0012] Optionally, the drive turntable is provided with an abutment post, and the unlocking knob is provided with a clearance arc groove. The abutment post is inserted into the clearance arc groove, and an elastic element is provided in the clearance arc groove. The two ends of the elastic element abut against the abutment post and the groove wall of the clearance arc groove on one side along the rotation direction of the unlocking knob, respectively. The elastic element is adapted to make the unlocking knob less likely to rotate when no force is applied.

[0013] Optionally, two elastic elements are provided, which are respectively located on both sides of the abutment post and arranged symmetrically. The linkage protrusion is located in the middle of the linkage slot through the two elastic elements.

[0014] Optionally, the elastic element is a spring.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0016] 1. When adjusting the length of the comb sleeve body, compared to pressing and then turning the knob, you only need to turn the unlock knob, which is simple and convenient to operate;

[0017] 2. The unlocking knob first rotates a specific angle relative to the knob drive assembly. The drive column moves under the action of the eccentric arc groove and drives the locking pin to disengage from the locking tooth groove by a certain distance. At the same time, the drive column disengages from the limiting protrusion in the eccentric arc groove, so that when it continues to rotate, the linkage protrusion abuts against the groove wall of the linkage slot, driving the drive turntable to rotate synchronously with the unlocking knob. The drive column can continue to move backward until it is adjusted to the next position, springs back, and produces a sense of the position. After the drive turntable rotates, it drives the comb sleeve to extend and retract. The structure is compact and ingeniously designed, and does not take up too much space.

[0018] 3. After adjusting the telescopic length of the comb sleeve, as long as no force is applied to the unlocking knob, the locking pin will automatically insert into the corresponding locking tooth groove under the action of the elastic drive component to achieve self-locking. No other operation is required, which further improves the convenience of operation and also improves the stability after the comb sleeve length is adjusted.

[0019] 4. When the locking pin is inserted into the locking tooth groove, the limiting protrusion will limit the radial movement of the drive column along the unlocking knob, so that the drive column can only move under the action of the eccentric arc groove when the unlocking knob is turned. This makes it less likely for the locking pin to be shaken by external force and disengage from the locking tooth groove, further improving the stability of the comb sleeve after self-locking.

[0020] 5. When no force is applied to the unlocking knob, the unlocking knob will rotate slightly under the action of the elastic element, so that the end of the limiting protrusion can be adjacent to the drive column to limit the radial movement of the drive column. At the same time, it can also make the linkage protrusion located in the middle of the linkage slot, which is convenient for subsequent forward or reverse rotation of the unlocking knob, further improving the stability after the comb sleeve is self-locked and the convenience of adjusting the length.

[0021] 6. The comb sleeve body and the drive plate are detachably connected. When the corresponding comb sleeve body is damaged, it can be directly disassembled and replaced, resulting in low maintenance costs. In addition, different comb sleeve bodies can be replaced according to the actual situation, making it more applicable.

[0022] In addition, this utility model provides a hair trimmer, including the telescopic adjustable self-locking comb sleeve as described above.

[0023] Compared with the prior art, the hair trimmer of this utility model has the same advantages as the prior art mentioned above, and will not be repeated here. Attached Figure Description

[0024] Figure 1This is a structural diagram showing the connection shell, comb body, knob drive assembly, and unlocking knob in an embodiment of this utility model.

[0025] Figure 2 This is an exploded view of the connecting shell, comb body, knob drive assembly, elastic locking tongue assembly and unlocking knob in an embodiment of this utility model;

[0026] Figure 3 This is an exploded view of the comb body, knob drive assembly, elastic locking tongue assembly and unlocking knob in the embodiment of this utility model;

[0027] Figure 4 This is a structural diagram of the cooperation between the knob drive assembly and the elastic locking tongue assembly in an embodiment of this utility model;

[0028] Figure 5 This is a structural diagram of the knob drive assembly, the elastic locking tongue assembly, and the unlocking knob in an embodiment of this utility model;

[0029] Figure 6 This is a structural diagram of the hair trimmer in an embodiment of this utility model.

[0030] Explanation of reference numerals in the attached drawings: 1. Connecting shell; 11. Base; 12. Locking tooth groove; 2. Comb sleeve body; 3. Knob drive assembly; 31. Drive turntable; 311. Mounting groove; 312. Linkage protrusion; 313. Abutment post; 32. Drive gear; 33. Drive plate; 331. Rack; 4. Elastic locking tongue assembly; 41. Locking pin; 42. Elastic drive element; 43. Drive post; 5. Unlocking knob; 51. Eccentric arc groove; 52. Limiting protrusion; 53. Linkage slot; 54. Yielding arc groove; 55. Elastic element; 56. Dial. Detailed Implementation

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0033] The terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0034] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0035] In a first aspect, this utility model embodiment provides a telescopic adjustable self-locking comb sleeve, as described above. Figure 1 and Figure 2 The telescopic adjustable self-locking comb cover includes a connecting shell 1, a comb cover body 2, a knob drive assembly 3, and a flexible locking tongue assembly 4. The connecting shell 1 is adapted to connect with a hair trimmer. The comb cover body 2 is slidably connected to the connecting shell 1. The knob drive assembly 3 is rotatably connected to the connecting shell 1 to drive the comb cover body 2 to move relative to the connecting shell 1. The flexible locking tongue assembly 4 is slidably connected to the knob drive assembly 3 and is adapted to lock the knob drive assembly 3 after rotation at any angle. The knob drive assembly 3 is equipped with an unlocking knob 5, and both the knob drive assembly 3 and the flexible locking tongue assembly 4 are movably connected to the unlocking knob 5. When the unlocking knob 5 is rotated to a specific angle, the unlocking knob 5 drives the flexible locking tongue assembly 4 to move, thereby releasing the lock on the knob drive assembly 3 and causing the knob drive assembly 3 to rotate synchronously to drive the telescopic adjustment of the comb cover body 2. When the unlocking knob 5 is not rotated, the flexible locking tongue assembly 4 locks the rotation of the knob drive assembly 3, thereby locking the telescopic movement of the comb cover body 2.

[0036] The connecting shell 1 can be detachably connected to the hair trimmer, making disassembly convenient for maintenance. One end of the comb body 2 is inserted into the connecting shell 1 and slidably connected to it, while the other end protrudes from the connecting shell 1. The protruding end of the comb body 2 is provided with multiple hair inlet channels spaced apart, allowing hair to enter the hair inlet channels during trimming.

[0037] Reference Figure 2 and Figure 3 The outer wall of the connecting shell 1 has a protruding ring. The knob drive assembly 3 is located inside the ring and can rotate relative to the connecting shell 1 within the ring. The knob drive assembly 3 includes a drive disc 31 and a drive gear 32. The drive disc 31 is concentric with the ring, and the drive gear 32 is also concentric with the drive disc 31, and the drive gear 32 is integrally formed on one side of the drive disc 31. A through hole is opened at the center of the ring, which communicates with the interior of the connecting shell 1. The drive gear 32 is inserted into the through hole and located inside the connecting shell 1. A base 11 is bolted to the interior of the connecting shell 1. The drive gear 32 is bolted to the base 11, but the bolts connecting the drive gear 32 only limit the axial movement of the drive gear 32 and do not limit its circumferential rotation. The drive disc 31 rotates within the ring.

[0038] Reference Figure 2 and Figure 3The knob drive assembly 3 also includes a drive plate 33, which is located inside the connecting shell 1 and can slide relative to the connecting shell 1. A rack 331 is integrally formed on the drive plate 33, and the rack 331 meshes with the drive gear 32. A connecting groove is provided at one end of the comb sleeve body 2 near the drive plate 33. The drive plate 33 is inserted into the connecting groove and snapped into place with the comb sleeve body 2. The drive plate 33 can move synchronously with the comb sleeve body 2, allowing for easy removal of the comb sleeve body 2 when it needs maintenance or replacement. When the drive turntable 31 rotates relative to the connecting shell 1, it drives the drive gear 32 to rotate, thereby moving the drive plate 33 to extend and retract the comb sleeve body 2.

[0039] Combination Figure 2 Reference Figure 3 and Figure 4 A mounting groove 311 is provided on the side of the drive turntable 31 opposite to the drive gear 32. The extension direction of the mounting groove 311 is the same as the radial direction of the drive turntable 31, and the side of the mounting groove 311 near the outer wall of the drive turntable 31 penetrates the drive turntable 31. The elastic locking tongue assembly 4 is slidably disposed in the mounting groove 311 and can rotate synchronously with the drive turntable 31.

[0040] The elastic locking tongue assembly 4 includes a locking pin 41 and an elastic drive member 42. In this embodiment, the elastic drive member 42 is preferably a spring, but in another embodiment, the elastic drive member 42 can be a spring sheet. The elastic drive member 42 is located in the mounting groove 311, and the locking pin 41 is located on the side of the elastic drive member 42 near the outer wall of the drive turntable 31. The two ends of the elastic drive member 42 abut against the locking pin 41 and the groove wall of the mounting groove 311, respectively. A plurality of locking tooth grooves 12 are circumferentially spaced on the inner wall of the ring. The end of the locking pin 41 away from the elastic drive member 42 can be inserted into any one of the locking tooth grooves 12 under the action of the elastic drive member 42 to lock the rotation of the drive turntable 31, thereby locking the comb body 2 after it has extended or retracted a certain length. In another embodiment, the elastic locking tongue assembly 4 can be provided on the connecting shell 1 and does not rotate synchronously with the drive turntable 31, while a plurality of locking tooth grooves 12 can be spaced apart on the outer peripheral wall of the drive turntable 31.

[0041] In this embodiment, the unlocking knob 5 is preferably a disc, and the unlocking knob 5 is concentric with the drive disc 31. A circular groove is formed on the side of the unlocking knob 5 near the drive disc 31, and the drive disc 31 is inserted into the groove. The unlocking knob 5 can rotate relative to the drive disc 31; it can also drive the drive disc 31 to rotate synchronously. When the unlocking knob 5 rotates relative to the drive disc 31, it causes the locking pin 41 to disengage from the locking tooth groove 12, thus unlocking the device. When the drive disc 31 rotates synchronously with the unlocking knob 5, it causes the comb body 2 to extend and retract for adjustment.

[0042] Combination Figure 2 Reference Figure 4 and Figure 5 The locking pin 41 has a beveled end, and a drive post 43 is integrally formed at the end of the locking pin 41 near the unlocking knob 5. An eccentric arc groove 51 is formed at the bottom of the circular groove, and both ends of the eccentric arc groove 51 are close to the center of the unlocking knob 5. The drive post 43 is inserted into the eccentric arc groove 51 and is located in the middle of the eccentric arc groove 51. Therefore, no matter whether the unlocking knob 5 rotates a certain angle forward or backward relative to the drive turntable 31, the drive post 43 can move closer to the center of the unlocking knob 5 under the action of the eccentric arc groove 51, thereby driving the locking pin 41 to disengage from the locking tooth groove 12 to achieve unlocking.

[0043] An integrally formed limiting protrusion 52 is formed in the middle of the groove wall of the eccentric arc groove 51 near the center of the unlocking knob 5. The limiting protrusion 52 extends radially along the unlocking knob 5. When the locking pin 41 is inserted into the locking tooth groove 12, the drive post 43 is located at the end of the limiting protrusion 52 away from the center of the unlocking knob 5. At this time, the movement of the drive post 43 along the radial direction of the unlocking knob 5 is limited, making it less likely for the locking pin 41 to be shaken by external force and disengaged from the locking tooth groove 12, thus improving the stability after locking.

[0044] Combination Figure 2 Reference Figure 4 and Figure 5 A linkage protrusion 312 is integrally formed on the side of the drive disc 31 near the unlocking knob 5, and the linkage protrusion 312 is arranged at intervals with the mounting groove 311. A linkage slot 53 is provided at the bottom of the circular groove, and the linkage protrusion 312 is inserted into the linkage slot 53. Since the unlocking knob 5 needs to be rotated at a specific angle relative to the drive disc 31 to drive the locking pin 41 to unlock, the linkage slot 53 is arranged at intervals with the linkage protrusion 312 on both sides of the groove wall of the unlocking knob 5. When the unlocking knob 5 is rotated at a specific angle to unlock, the linkage protrusion 312 abuts against the groove wall of the corresponding side of the linkage slot 53, so that the drive disc 31 can rotate synchronously with the unlocking knob 5 to drive the comb body 2 to extend and retract.

[0045] In this embodiment, two linkage protrusions 312 are preferably arranged at even intervals around the circumference. Correspondingly, two linkage slots 53 are also provided, with the mounting slot 311 located between the two linkage protrusions 312. This arrangement makes the force more even and the rotation smoother when the unlocking knob 5 drives the drive turntable 31 to rotate.

[0046] Combination Figure 2 Reference Figure 4 and Figure 5One side of the drive turntable 31 forming linkage protrusion 312 also has an integrally formed abutment post 313, which is located between the two connecting protrusions away from the mounting groove 311. A clearance arc groove 54 is opened between the bottom of the circular groove, which extends circumferentially along the unlocking knob 5. The abutment post 313 is inserted into the clearance arc groove 54 and located in the middle of the clearance arc groove 54. Two elastic members 55 are provided on opposite sides of the abutment post 313 along the extension direction of the clearance arc groove 54. The two elastic members 55 are located in the clearance arc groove 54, and the two ends of the corresponding elastic members 55 abut against the abutment post 313 and the groove wall of the corresponding clearance arc groove 54, respectively. When no force is applied to the unlocking knob 5, it will slightly rotate under the action of the elastic element 55, allowing the end of the limiting protrusion 52 to be adjacent to the drive post 43 and limit the radial movement of the drive post 43. Simultaneously, it also allows the linkage protrusion 312 to be located in the middle of the linkage slot 53, facilitating subsequent forward or reverse rotation of the unlocking knob 5. Furthermore, the elastic element 55 can also prevent the unlocking knob 5 from rotating easily when no force is applied. In this embodiment, the elastic element 55 is preferably a spring; in another embodiment, the elastic element 55 can also be a spring sheet.

[0047] A dial 56 is installed on the side of the unlocking knob 5 away from the drive turntable 31. The dial 56 rotates synchronously with the unlocking knob 5, allowing the user to intuitively understand the length of the comb body 2 extending out.

[0048] The implementation principle of the telescopic adjustable self-locking comb sleeve in this embodiment is as follows: When adjusting the telescopic length of the comb sleeve body 2, the unlocking knob 5 is first rotated at a specific angle relative to the knob drive assembly 3. Under the action of the eccentric arc groove 51, the drive column 43 moves closer to the center of the unlocking knob 5, thereby driving the locking pin 41 to disengage partially from the locking tooth groove 12. Continuing to rotate the unlocking knob 5, the inclined surface at the end of the locking pin 41 will be compressed by the spring, causing the locking pin 41 to continue to retract and unlock. The locking pin 41 will be adjusted to the next position, and the spring will drive it to rebound and insert into an adjacent locking tooth groove 12, generating a sense of position. At the same time, the linkage protrusion 312 abuts against the groove wall on the corresponding side of the linkage slot 53, so that the drive turntable 31 can rotate synchronously with the unlocking knob 5. After the drive turntable 31 rotates, it will drive the drive gear 32 to rotate, thereby driving the drive plate 33 to move to drive the telescopic extension and retraction of the comb sleeve body 2. The entire process only requires rotating the unlocking knob 5.

[0049] Secondly, another embodiment of this utility model provides a hair trimmer, see reference to Figure 6 The hair trimmer is equipped with the aforementioned telescopic adjustable self-locking comb cover, which makes it more convenient to adjust the length of the comb cover body 2, and the comb cover body 2 can achieve self-locking after the telescopic length is adjusted.

[0050] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A telescopic adjustable self-locking comb sleeve, characterized in that: The device includes a connecting shell (1), a comb body (2), a knob drive assembly (3), and an elastic locking tongue assembly (4). The connecting shell (1) is adapted to be connected to a hair trimmer. The comb body (2) is slidably connected to the connecting shell (1). The knob drive assembly (3) is rotatably connected to the connecting shell (1) to drive the comb body (2) to move relative to the connecting shell (1). The elastic locking tongue assembly (4) is slidably connected to the knob drive assembly (3) or the connecting shell (1). The elastic locking tongue assembly (4) is adapted to lock the knob drive assembly (3) after rotating at any angle. The knob drive assembly (3) is provided with an unlocking knob (5). Both the knob drive assembly (3) and the elastic locking tongue assembly (4) are movably connected to the unlocking knob (5). When the unlocking knob (5) rotates at a specific angle relative to the drive turntable (31), the unlocking knob (5) drives the elastic locking tongue assembly (4) to move to release the lock on the knob drive assembly (3), and drives the knob drive assembly (3) to rotate synchronously to drive the comb body (2) to extend and retract. When the unlocking knob (5) is not rotated, the elastic locking tongue assembly (4) locks the rotation of the knob drive assembly (3).

2. The telescopic adjustable self-locking comb sleeve according to claim 1, characterized in that: The connecting shell (1) is provided with a plurality of locking tooth grooves (12), which are arranged circumferentially at intervals on the knob drive assembly (3). The elastic locking tongue assembly (4) includes a locking pin (41) and an elastic drive member (42). The locking pin (41) is slidably connected to the knob drive assembly (3) and rotates synchronously with the knob drive assembly (3). The locking pin (41) is adapted to be inserted into any of the locking tooth grooves (12) to lock the rotation of the knob drive assembly (3). The elastic drive member (42) drives the locking pin (41) to be inserted into the locking tooth groove (12).

3. The telescopic adjustable self-locking comb sleeve according to claim 2, characterized in that: The locking pin (41) is fixedly provided with a drive post (43), and the unlocking knob (5) is provided with an eccentric arc groove (51). The drive post (43) is inserted into the eccentric arc groove (51). The eccentric arc groove (51) is adapted to drive the drive post (43) to move when the unlocking knob (5) rotates relative to the knob drive assembly (3) so as to drive the locking pin (41) to disengage from the locking tooth groove (12).

4. The telescopic adjustable self-locking comb sleeve according to claim 3, characterized in that: A limiting protrusion (52) is provided on one side of the groove wall of the eccentric arc groove (51). When the locking pin (41) is inserted into the locking tooth groove (12), the drive column (43) is radially moved and limited at the end of the limiting protrusion (52) away from the rotation center.

5. A telescopic adjustable self-locking comb sleeve according to any one of claims 1-4, characterized in that: The knob drive assembly (3) includes a drive turntable (31) rotatably connected to the connecting shell (1), the elastic locking tongue assembly (4) is slidably disposed on the drive turntable (31) and rotates synchronously with the drive turntable (31), one end of the unlocking knob (5) is sleeved on the drive turntable (31), the drive turntable (31) is fixedly provided with a linkage protrusion (312), the unlocking knob (5) is provided with a linkage slot (53), the linkage protrusion (312) is inserted into the linkage slot (53), and the linkage protrusion (312) is arranged at intervals with the groove wall of the linkage slot (53) along the rotation direction of the drive turntable (31).

6. The telescopic adjustable self-locking comb sleeve according to claim 5, characterized in that: The knob drive assembly (3) further includes a drive gear (32) and a drive plate (33). The drive gear (32) is fixedly connected to the drive turntable (31), and the drive plate (33) is detachably connected to the comb body (2). The drive plate (33) is fixedly provided with a rack (331), and the rack (331) meshes with the drive gear (32).

7. The telescopic adjustable self-locking comb sleeve according to claim 5, characterized in that: The drive turntable (31) is provided with an abutment post (313), and the unlocking knob (5) is provided with a clearance arc groove (54). The abutment post (313) is inserted into the clearance arc groove (54), and the clearance arc groove (54) is provided with an elastic element (55). The two ends of the elastic element (55) abut against the abutment post (313) and the groove wall of the clearance arc groove (54) on the side along the rotation direction of the unlocking knob (5), respectively. The elastic element (55) is suitable for driving the unlocking knob (5) to not easily rotate when no force is applied.

8. The telescopic adjustable self-locking comb sleeve according to claim 7, characterized in that: Two elastic elements (55) are provided, and the two elastic elements (55) are respectively located on both sides of the abutment post (313) and arranged symmetrically. The linkage protrusion (312) is located in the middle of the linkage slot (53) through the two elastic elements (55).

9. A telescopic adjustable self-locking comb sleeve according to claim 7, characterized in that: The elastic element (55) is a spring.

10. A hair trimmer, characterized in that, Includes the telescopic adjustable self-locking comb sleeve as described in any one of claims 1-9.

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