Combined switch handle

Abstract

The utility model provides a combined switch handle, which belongs to the technical field of automobile parts and comprises a handle shell. The groove frame is fixedly installed in the handle shell, the groove frame comprises an arc-shaped part, the end face of the arc-shaped part is provided with a first sliding groove face, and the first sliding groove face is provided with at least two gear grooves; the rotating seat is installed in the handle shell, a first bullet head is installed on the rotating seat and extends in the axial direction of the rotating seat, the top end of the first bullet head is connected with the first sliding groove face in an abutting mode, the first bullet head is provided with a first elastic piece, and the first elastic piece is connected with the groove frame; the first bullet head can stretch out and draw back in the axial direction of the rotating base through the first elastic piece. The utility model has the beneficial effects that the first bullet head is designed to be axially arranged so as to reduce the requirement on the radial space of the handle, so that the outer diameter outline of the handle is thinner, and the overall aesthetic degree, overall coordination and compactness in a cockpit are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive parts and relates to a combination switch handle. Background Art

[0002] A vehicle combination switch refers to a multi-functional control device installed on the steering column of an automobile. The vehicle combination switch generally has two switch handles, left and right. Multiple functions are integrated on these two switch handles, enabling the driver to operate these functions without releasing the steering wheel, thereby improving driving safety and convenience. In some vehicle models, one of the combination switch handles integrates the control function of the front windshield wiper or the rear windshield wiper, providing a more comprehensive and convenient operation experience for the driver.

[0003] Some combination switch handles adopt a knob or button structure to achieve the control function of the front windshield wiper or the rear windshield wiper. This design not only requires installing corresponding mechanical and electronic components inside the handle but also needs to cooperate with a bullet head structure to provide clear tactile feedback and a limiting function. The bullet head structure, through its unique shape and spring mechanism, ensures that the driver can feel a clear gear shift during operation, thereby improving the accuracy and reliability of use.

[0004] However, since the bullet head structure needs to occupy a large internal space of the handle, this leads to a significant increase in the overall internal space of the handle. To accommodate the bullet head structure, the outer diameter of the handle contour has to be increased accordingly, becoming relatively thick. The switch handle with a thicker outer diameter not only affects the overall aesthetics inside the cockpit but also reduces the overall coordination and compactness of the cockpit layout. Summary of the Utility Model

[0005] The purpose of the utility model is to propose a combination switch handle for the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved by the following technical solutions: A combination switch handle, comprising:

[0007] A handle housing;

[0008] A slot frame, the slot frame is fixedly installed inside the handle housing. The slot frame includes an arc portion, and the arc portion is arranged as an arc-shaped plate structure centered on the central axis of the slot frame. A first sliding groove surface is provided on the end face of the arc portion, and the first sliding groove surface has at least two gear slots;

[0009] Rotating seat, the rotating seat is installed inside the handle housing, and the rotating seat is rotatably connected to the slot frame. The rotating seat is equipped with a first bullet head, the first bullet head is arranged along the axial direction of the rotating seat, the top end of the first bullet head is in contact connection with the first chute surface, the first bullet head is provided with a first elastic member, and the first elastic member is connected to the slot frame;

[0010] When the rotating seat rotates, the first bullet head slides along the first chute surface, and the first bullet head can axially expand and contract along the rotating seat through the first elastic member.

[0011] Preferably, one of the rotating seat and the slot frame is provided with two travel stoppers and the other is provided with a limit block, and the limit block is located between the two travel stoppers; the travel range of the rotating seat includes two travel limit positions. When the rotating seat rotates to one travel limit position, the limit block is in contact connection with one of the travel stoppers, and when the rotating seat rotates to the other travel limit position, the limit block is in contact connection with the other travel stopper.

[0012] Preferably, the first chute surface is set to a curved surface structure with a W-shaped trajectory.

[0013] Preferably, the rotating seat is provided with a magnetic member, a circuit board is arranged inside the handle housing, and a Hall induction element is arranged on the circuit board. The Hall induction element is set to be able to sense the angular position of the magnetic member and output a corresponding electrical signal.

[0014] Preferably, a guiding hole is axially opened on the end face of the rotating seat, the first elastic member and the first bullet head are both installed in the guiding hole, one end of the first elastic member is in contact connection with the bottom of the guiding hole and the other end is in contact connection with the first bullet head.

[0015] Preferably, the opening of the guiding hole has an embedded portion, the embedded portion is set to a circular arc structure centered on the central axis of the rotating seat, the rotating seat and the slot frame are coaxially arranged, and the arc portion is inserted into the embedded portion.

[0016] Preferably, the number of the first chute surfaces is two and the two first chute surfaces are symmetrically arranged with the center line of the slot frame as the axis of symmetry. The number of the first bullet heads is two and the two first bullet heads are symmetrically arranged with the center line of the rotating seat as the axis of symmetry. The two first bullet heads are respectively in contact connection with the two first chute surfaces.

[0017] Preferably, a knob is arranged on the circumferential surface of the rotating seat, and an avoidance groove is opened on the handle housing, and the knob is located in the avoidance groove.

[0018] Preferably, a rotatable adjustment knob is installed at the end of the handle housing, and one of the adjustment knob and the rotating seat is configured to control the front windshield wiper and the other is configured to control the rear windshield wiper.

[0019] Preferably, a rotatable rotating shaft is installed inside the handle housing. The rotating shaft is circumferentially and fixedly connected to the adjustment knob. A second bullet head is installed on the rotating shaft. The second bullet head extends along the radial direction of the rotating shaft. The second bullet head is provided with a second elastic member. The second elastic member is connected to the rotating shaft. A second chute surface is provided on the inner circumferential surface of the handle housing. The second bullet head is in contact connection with the second chute surface. When the adjustment knob rotates, the second bullet head slides along the second chute surface, and the second bullet head can expand and contract along the radial direction of the rotating shaft through the second elastic member.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. The first bullet head is designed to be axially arranged to reduce the requirement for the radial space of the handle, making the outer diameter profile of the handle more slender, and improving the overall aesthetics, overall coordination and compactness in the cockpit.

[0022] 2. This compact and slender combined switch handle design allows for the integration of more control elements or the addition of additional safety features in the cockpit without sacrificing functionality. It is easier to hold and operate. Especially in occasions where frequent use is required, a compact and ergonomic handle can make the driver feel more comfortable when operating and reduce fatigue at the same time.

[0023] 3. When the rotating seat rotates to one of the stroke limit positions, the limit block will contact one of the stroke stoppers, thereby preventing the further rotation of the rotating seat.

[0024] 4. Due to the pressure of the first elastic member, the first bullet head will slide along the slope of the first chute surface towards the nearest valley bottom (gear slot). This is because any position on the slope is not a stable equilibrium point, and the first bullet head will naturally seek the nearest low point, that is, the gear slot, under the action of the elastic force, so that the first bullet head will automatically slide into the nearest gear slot, improving the operation accuracy.

[0025] 5. The control functions of the front windshield wiper and the rear windshield wiper are integrated on a combined switch handle, which improves the integration level of the combined switch. Users can conveniently control the front and rear windshield wipers through the same handle without switching between different switches. In a specific structure, users can control different modes of the rear windshield wiper (such as intermittent, low speed, high speed) by toggling the button on the rotating seat; users can control different modes of the front windshield wiper (such as intermittent, low speed, high speed) by rotating the adjustment knob at the end of the handle housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is an exploded view of the adjustment knob, the rotating shaft, the rotating seat and the slot frame of the present utility model.

[0027] Figure 2 FIG. is an exploded view of the rotating seat and the slot frame structure of the present utility model.

[0028] Figure 3 FIG. is a schematic structural view of the combined switch handle of the present utility model.

[0029] Figure 4 FIG. is a schematic view of the connection relationship between the rotating seat and the slot frame of the present utility model.

[0030] Figure 5 FIG. is a schematic structural view of the guiding hole of the present utility model.

[0031] Figure 6 FIG. is a schematic view of the connection relationship between the first bullet head and the first sliding groove surface of the present utility model.

[0032] Figure 7 FIG. is a schematic view of the connection relationship between the slot frame and the handle housing of the present utility model.

[0033] In the figures, 100, handle housing; 110, clearance groove; 200, slot frame; 210, arc portion; 220, first sliding groove surface; 221, gear position groove; 230, limit block; 300, rotating seat; 310, first bullet head; 311, first elastic member; 320, stroke stop block; 330, guiding hole; 331, insertion opening portion; 340, button; 400, adjustment knob; 410, rotating shaft; 420, second bullet head; 421, second elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following are specific embodiments of the present utility model in combination with the drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0035] As Figures 1-7As shown in the figure, a combined switch handle includes: a handle housing 100; a slot frame 200 fixedly installed inside the handle housing 100. The slot frame 200 includes an arc portion 210 which is arranged as a circular arc plate-like structure centered on the central axis of the slot frame 200. A first sliding groove surface 220 is provided on the end face of the arc portion 210, and the first sliding groove surface 220 has at least two gear positions grooves 221; a rotating seat 300 installed inside the handle housing 100 and rotatably connected to the slot frame 200. A first bullet head 310 is installed on the rotating seat 300 and extends along the axial direction of the rotating seat 300. The top end of the first bullet head 310 is in contact connection with the first sliding groove surface 220. A first elastic member 311 is provided on the first bullet head 310 and is connected to the slot frame 200. When the rotating seat 300 rotates, the first bullet head 310 slides along the first sliding groove surface 220, and the first bullet head 310 can telescopically move along the axial direction of the rotating seat 300 through the first elastic member 311.

[0036] The handle housing 100 is the housing structure of the switch handle; the slot frame 200 is fixedly installed inside the handle housing 100 and is used to provide the first sliding groove surface 220. Among them, the slot frame 200 has an arc portion 210 which is actually a circular arc-shaped bent plate structure. The first sliding groove surface 220 is provided on the end face of the arc portion 210. The gear positions grooves 221 on the first sliding groove surface 220 define different positions or states that the rotating seat 300 can switch to. The first bullet head 310 can telescopically move along the track shape of the first sliding groove surface 220 to provide an operating feel. The rotating seat 300 is a rotatable component, and the rotating seat 300 can realize the switching of different functions or modes through rotation. The first bullet head 310 can provide a switching feel and operating feedback for the rotating seat 300. In the actual structure, the rotating seat 300 is given the function of controlling the rear windshield wiper, and the rear windshield wiper can be stopped or operated through the rotating seat 300.

[0037] Traditional bullet heads are all arranged radially, which means that this design will occupy a large amount of radial space inside the handle, making the outer diameter contour of the handle thicker. In this design, the first bullet head 310 is arranged along the axial direction of the rotating seat 300. The first bullet head 310 can tightly contact the first sliding groove surface 220 under the action of the first elastic member 311, and the first bullet head 310 is only allowed to telescopically move along the axial direction of the rotating seat 300. This design integrates the bullet head in the axial direction, making the bullet head structure more compact, significantly reducing the requirement for the radial space of the handle, and thus making the handle more slender.

[0038] It should be noted that in the limited space inside the vehicle, especially near the steering column, every millimeter of space is extremely precious. This compact and slender combination switch handle design allows for the integration of more control elements or the addition of extra safety features in the cockpit without sacrificing functionality. Moreover, the more slender handle shape conforms to the design trend of modern vehicle interiors, providing a smoother and more concise visual effect. And this combination switch handle is easier to hold and operate. Especially in situations where frequent use is required, a compact and ergonomic handle can make the driver feel more comfortable during operation and reduce fatigue at the same time.

[0039] When the rotating seat 300 rotates, the first bullet head 310 moves along the trajectory shape of the first chute surface 220, and the first bullet head 310 can be telescoped through the first elastic member 311 to allow it to switch between the respective gear slots 221. When the first bullet head 310 moves from one gear slot 221 to another gear slot 221, the first elastic member 311 can enable the first bullet head 310 to quickly and accurately enter the new gear slot 221, so as to provide an operating feel and achieve precise and repeatable position control.

[0040] As Figures 1-4 shown, on the basis of the above embodiment, one of the rotating seat 300 and the slot frame 200 is provided with two stroke stoppers 320 and the other is provided with a limit block 230, and the limit block 230 is located between the two stroke stoppers 320; the stroke range of the rotating seat 300 includes two stroke limit positions. When the rotating seat 300 rotates to one stroke limit position, the limit block 230 is in contact connection with one stroke stopper 320, and when the rotating seat 300 rotates to the other stroke limit position, the limit block 230 is in contact connection with the other stroke stopper 320.

[0041] The two stroke stoppers 320 are arranged on one of the components of the rotating seat 300 and the slot frame 200. The two stroke stoppers 320 define the maximum angle range within which the rotating seat 300 can rotate, that is, the two stroke limit positions. The function of the stroke stopper 320 is to physically limit the rotation range of the rotating seat 300 to ensure that it does not exceed the predetermined angle. The limit block 230 is arranged on the other component of the rotating seat 300 and the slot frame 200 and is located between the above two stroke stoppers 320. When the rotating seat 300 rotates to one of the stroke limit positions, the limit block 230 will contact one of the stroke stoppers 320, thereby preventing the further rotation of the rotating seat 300.

[0042] On the basis of the above - mentioned embodiment, the first chute surface 220 is set as a curved - surface structure with a W - shaped trajectory. The W - shaped curved - surface structure has two valley positions (i.e., the positions of the two gear slots 221). Through the W - shaped curved - surface design, there will be an obvious resistance change when the rotating seat switches between each gear slot 221, which provides clear operation feedback to the driver and enables the driver to feel a definite position change every time of switching. In addition, due to the pressure of the first elastic member 311, the first bullet - head 310 will slide along the slope of the first chute surface 220 towards the nearest valley bottom (gear slot 221). This is because any position on the slope is not a stable equilibrium point, and the first bullet - head 310 will naturally seek the nearest low point, that is, the gear slot 221, under the action of the elastic force, so that the first bullet - head 310 will automatically slide into the nearest gear slot 221, improving the operation accuracy. When the function needs to be switched, a relatively large torque is required for the rotating seat 300 to make the first bullet - head 310 leave the gear slot 221.

[0043] As Figure 1 、 Figure 4 shown, on the basis of the above - mentioned embodiment, the rotating seat 300 is provided with a magnetic member, a circuit board is arranged in the handle housing 100, and a Hall sensing element is arranged on the circuit board. The Hall sensing element is set to be able to sense the angular position of the magnetic member and output a corresponding electrical signal. In this embodiment, the magnetic member and the Hall sensing element are introduced to realize the non - contact sensing of the angular position of the rotating seat 300.

[0044] As Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 shown, on the basis of the above - mentioned embodiment, a guiding hole 330 is axially formed in the end face of the rotating seat 300. The first elastic member 311 and the first bullet - head 310 are both installed in the guiding hole 330. One end of the first elastic member 311 is in contact connection with the bottom of the guiding hole 330 and the other end is in contact connection with the first bullet - head 310.

[0045] Both the first elastic member 311 and the first bullet - head 310 are installed in the guiding hole 330. This design ensures that the first bullet - head 310 can expand and contract axially and always keep in contact with the first chute surface 220. The design of the guiding hole 330 ensures that the bullet - head can only move axially and cannot move radially or in other directions.

[0046] On the basis of the above - mentioned embodiment, the opening of the guiding hole 330 has an inserting portion 331. The inserting portion 331 is set as an arc - shaped structure with the central axis of the rotating seat 300 as the center of the circle. The rotating seat 300 and the slot frame 200 are coaxially arranged, and the arc - shaped portion 210 is inserted into the inserting portion 331.

[0047] The purpose of providing the slot portion 331 is to allow the arcuate portion 210 to be inserted into the slot portion 331 and maintain a stable connection, allowing the first bullet head 310 to directly mate with the first chute surface 220. Because the slot portion 331 and the arcuate portion 210 are both arc-shaped structures centered on the central axis of the rotating base 300 and the channel frame 200, when the rotating base 300 rotates, the arcuate portion 210 of the channel frame 200 can move smoothly along the slot portion 331 without causing friction or jamming with the slot portion 331.

[0048] like Figure 1 、 Figure 2 、 Figure 5 As shown, on the basis of the above embodiment, the number of the first slide groove surfaces 220 is two and the two first slide groove surfaces 220 are symmetrically arranged with the center line of the slot frame 200 as the symmetry axis, the number of the first bullet heads 310 is two and the two first bullet heads 310 are symmetrically arranged with the center line of the rotating seat 300 as the symmetry axis, and the two first bullet heads 310 are respectively in contact with the two first slide groove surfaces 220.

[0049] Because the two first chute surfaces 220 and the two first bullet heads 310 are symmetrically arranged, the entire structure is more balanced and stable during rotation. The symmetrical design can reduce offset or tilt caused by uneven force on one side, ensuring smooth operation. The design of two first chute surfaces 220 and two first bullet heads 310 provides more contact points, thereby improving the accuracy of position control. The two first bullet heads 310 move simultaneously along their respective chute surfaces, which can more accurately determine the position of the rotating base 300 and reduce the error that may be caused by a single bullet head.

[0050] like Figures 1-3 As shown, based on the above embodiment, a dial button 340 is provided on the circumference of the rotating base 300, and a clearance groove 110 is provided in the handle housing 100, and the dial button 340 is located in the clearance groove 110. The dial button 340 is installed on the circumference of the rotating base 300, and the user can rotate the rotating base 300 by dialing the dial button 340. The design of the dial button 340 is generally to facilitate finger operation and provide a better grip and control. The design of the clearance groove 110 ensures that the dial button 340 can move freely without being restricted by the handle housing 100.

[0051] like Figure 1 、 Figure 3 As shown, based on the above embodiment, a rotatable adjustment knob 400 is installed at the end of the handle housing 100, and one of the adjustment knob 400 and the rotating base 300 is configured to control the front wiper and the other is configured to control the rear wiper.

[0052] The control functions of the front windshield wiper and the rear windshield wiper are integrated on a combined switch handle, which improves the integration degree of the combined switch. Users can conveniently control the front and rear windshield wipers through the same handle without switching between different switches. In a specific structure, users can control different modes (such as intermittent, low speed, high speed) of the rear windshield wiper by toggling the button 340 on the rotating seat 300; users can control different modes (such as intermittent, low speed, high speed) of the front windshield wiper by rotating the adjustment knob 400 at the end of the handle housing 100.

[0053] Based on the above embodiment, a rotatable rotating shaft 410 is installed inside the handle housing 100. The rotating shaft 410 is circumferentially and fixedly connected to the adjustment knob 400. A second bullet head 420 is installed on the rotating shaft 410. The second bullet head 420 extends along the radial direction of the rotating shaft 410. A second elastic member 421 is provided on the second bullet head 420. The second elastic member 421 is connected to the rotating shaft 410. A second sliding groove surface is provided on the inner peripheral surface of the handle housing 100. The second bullet head 420 is in contact connection with the second sliding groove surface; when the adjustment knob 400 rotates, the second bullet head 420 slides along the second sliding groove surface, and the second bullet head 420 can expand and contract along the radial direction of the rotating shaft 410 through the second elastic member 421.

[0054] The adjustment knob 400 can control the rotation of the rotating shaft 410 to control the front windshield wiper. The second bullet head 420 on the rotating shaft 410 is designed as a radially arranged structure. Since the adjustment knob 400 is located at the end of the handle housing 100, it is necessary to reduce the occupied axial space, so it is set as a radially arranged structure, and a slightly thicker end of the switch handle does not affect the use effect.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, rear...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, in the present invention, descriptions such as "first", "second", "one" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0057] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined.

[0058] In addition, the technical solutions between the various embodiments of the present utility model may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

Claims

1. A combined switch handle, characterized in that, Comprising: A handle housing (100); A slot rack (200), the slot rack (200) is fixedly installed inside the handle housing (100), the slot rack (200) includes an arc portion (210), the arc portion (210) is arranged as a circular arc plate-like structure centered on the central axis of the slot rack (200), a first chute surface (220) is provided on the end face of the arc portion (210), and the first chute surface (220) has at least two gear slots (221); A rotating seat (300), the rotating seat (300) is installed inside the handle housing (100), and the rotating seat (300) is rotatably connected to the slot rack (200), a first bullet head (310) is installed on the rotating seat (300), the first bullet head (310) extends along the axial direction of the rotating seat (300), the top end of the first bullet head (310) is in contact connection with the first chute surface (220), and a first elastic member (311) is provided on the first bullet head (310), and the first elastic member (311) is connected to the slot rack (200); When the rotating seat (300) rotates, the first bullet head (310) slides along the first chute surface (220), and the first bullet head (310) can telescopically move along the axial direction of the rotating seat (300) through the first elastic member (311).

2. The combination switch handle according to claim 1, wherein: One of the rotating seat (300) and the slot rack (200) is provided with two travel stoppers (320) and the other is provided with a limit block (230), and the limit block (230) is located between the two travel stoppers (320); the travel range of the rotating seat (300) includes two travel limit positions, when the rotating seat (300) rotates to one travel limit position, the limit block (230) is in contact connection with one of the travel stoppers (320), and when the rotating seat (300) rotates to the other travel limit position, the limit block (230) is in contact connection with the other travel stopper (320).

3. The combined switch handle according to claim 1, characterized in that: The first chute surface (220) is arranged as a curved surface structure with a W-shaped trajectory.

4. The combination switch handle according to claim 3, wherein: The rotating seat (300) is provided with a magnetic member, a circuit board is arranged inside the handle housing (100), and a Hall induction element is arranged on the circuit board, and the Hall induction element is arranged to be able to sense the angular position of the magnetic member and output a corresponding electrical signal.

5. The combination switch handle according to claim 1, characterized in that: A guiding hole (330) is axially opened on the end face of the rotating seat (300), the first elastic member (311) and the first bullet head (310) are both installed in the guiding hole (330), one end of the first elastic member (311) is in contact connection with the bottom of the guiding hole (330) and the other end is in contact connection with the first bullet head (310).

6. The combination switch handle according to claim 5, wherein: The opening of the guiding hole (330) has a socket part (331), and the socket part (331) is arranged in an arc-shaped structure with the central axis of the rotating seat (300) as the center of the circle. The rotating seat (300) is coaxially arranged with the groove frame (200), and the arc part (210) is inserted into the socket part (331).

7. A combined switch handle according to any one of claims 1-6, characterized in that: The number of the first sliding groove surfaces (220) is two, and the two first sliding groove surfaces (220) are symmetrically arranged with the center line of the groove frame (200) as the axis of symmetry. The number of the first bullet heads (310) is two, and the two first bullet heads (310) are symmetrically arranged with the center line of the rotating seat (300) as the axis of symmetry. The two first bullet heads (310) are respectively in contact connection with the two first sliding groove surfaces (220).

8. The combined switch handle according to claim 1, characterized in that: A dial button (340) is arranged on the circumferential surface of the rotating seat (300), and an avoidance groove (110) is formed in the handle housing (100). The dial button (340) is located in the avoidance groove (110).

9. The combined switch handle according to claim 1, characterized in that: A rotatable adjustment knob (400) is installed at the end of the handle housing (100). One of the adjustment knob (400) and the rotating seat (300) is arranged to control the front windshield wiper and the other is arranged to control the rear windshield wiper.

10. The combination switch handle according to claim 9, characterized in that: A rotatable rotating shaft (410) is installed in the handle housing (100). The rotating shaft (410) is circumferentially and fixedly connected with the adjustment knob (400). A second bullet head (420) is installed on the rotating shaft (410). The second bullet head (420) extends along the radial direction of the rotating shaft (410). The second bullet head (420) is provided with a second elastic member (421). The second elastic member (421) is connected with the rotating shaft (410). A second sliding groove surface is arranged on the inner circumferential surface of the handle housing (100). The second bullet head (420) is in contact connection with the second sliding groove surface. When the adjustment knob (400) rotates, the second bullet head (420) slides along the second sliding groove surface, and the second bullet head (420) can expand and contract along the radial direction of the rotating shaft (410) through the second elastic member (421).

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