Combined switch handle

Abstract

The invention provides a combined switch handle, and belongs to the technical field of automobile parts. 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 invention 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 invention belongs to the technical field of automobile parts and relates to a combination switch handle. Background Art

[0002] The vehicle combination switch refers to a multifunctional control device installed on the steering column of a car. The vehicle combination switch generally has two switch handles, left and right, which integrate multiple functions, allowing the driver to operate these functions without releasing the steering wheel, thereby improving driving safety and convenience. In some models, one of the combination switch handles integrates the control function of the front wiper or the control function of the rear wiper, providing the driver with a more comprehensive and convenient operating experience.

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

[0004] However, since the bullet-shaped structure needs to occupy a larger space inside the handle, this leads to a significant increase in the overall internal space of the handle. In order to accommodate the bullet-shaped structure, the outer diameter of the handle has to be increased accordingly, becoming relatively thick. The thick outer diameter of the switch handle not only affects the overall aesthetics of the cockpit, but also reduces the overall coordination and compactness of the cockpit layout. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to provide a combination switch handle.

[0006] The object of the present invention can be achieved through the following technical solutions: A combination switch handle, comprising:

[0007] Handle housing;

[0008] A slot frame, the slot frame is fixedly installed in the handle housing, the slot frame includes an arc portion, the arc portion is configured as an arc-shaped plate-like structure with the central axis of the slot frame as the center, the end surface of the arc portion is provided with a first slide groove surface, and the first slide groove surface has at least two gear grooves;

[0009] A rotating seat, the rotating seat is installed in the handle housing, and the rotating seat is rotatably connected to the slot frame, the rotating seat is installed with a first bullet head, the first bullet head is arranged along the axial direction of the rotating seat, the top of the first bullet head is in contact with the first slide groove surface, and 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 sliding groove surface, and the first bullet head can be extended and retracted along the axial direction of the rotating seat through the first elastic member.

[0011] Preferably, one of the rotating seat and the slot frame is provided with two travel blocks and the other is provided with a limit block, and the limit block is located between the two travel blocks; 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 abutted and connected with one travel block, and when the rotating seat rotates to the other travel limit position, the limit block is abutted and connected with the other travel block.

[0012] Preferably, the first slide groove surface is configured as a curved surface structure with a W-shaped track.

[0013] Preferably, the rotating seat is provided with a magnetic part, a circuit board is provided in the handle housing, a Hall sensor element is provided on the circuit board, and the Hall sensor element is configured to sense the angular position of the magnetic part and output a corresponding electrical signal.

[0014] Preferably, a guide hole is opened in the end face of the rotating seat along its axial direction, the first elastic member and the first bullet head are both installed in the guide hole, one end of the first elastic member is abutted and connected to the bottom of the guide hole and the other end is abutted and connected to the first bullet head.

[0015] Preferably, the opening of the guide hole has an embedding portion, and the embedding portion is arranged as an arc-shaped structure with the central axis of the rotating seat as the center of the circle, the rotating seat and the groove frame are arranged coaxially, and the arc-shaped portion is inserted into the embedding portion.

[0016] Preferably, the number of the first slide groove surfaces is two and the two first slide groove surfaces are symmetrically arranged with the center line of the groove 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, and the two first bullet heads are respectively in contact with the two first slide groove surfaces.

[0017] Preferably, a dial button is provided on the circumferential surface of the rotating seat, and a clearance groove is provided on the handle shell, and the dial button is located in the clearance groove.

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

[0019] Preferably, a rotatable rotating shaft is installed in the handle shell, and the rotating shaft is circumferentially fixedly connected to the adjusting knob, and a second bullet head is installed on the rotating shaft, and the second bullet head is arranged along the radial extension of the rotating shaft, and the second bullet head is provided with a second elastic member, and the second elastic member is connected to the rotating shaft, and the inner circumferential surface of the handle shell is provided with a second slide groove surface, and the second bullet head is abutted and connected with the second slide groove surface; when the adjusting knob is rotated, the second bullet head slides along the second slide groove surface, and the second bullet head can be extended and retracted along the radial direction of the rotating shaft through the second elastic member.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

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

[0022] 2. This compact and slim combination switch handle design allows more control elements to be integrated into the cockpit or additional safety features to be added without sacrificing functionality. It 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 when operating and reduce fatigue.

[0023] 3. When the rotating seat rotates to one of the travel limit positions, the limit block will contact one of the travel blocks, thereby preventing the rotating seat from rotating further.

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

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

[0026] Figure 1 It is a structural exploded view of the adjusting knob, rotating shaft, rotating seat and slot frame of the present invention.

[0027] Figure 2 It is an exploded view of the rotating seat and the slot frame structure of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the combination switch handle of the present invention.

[0029] Figure 4 It is a schematic diagram of the connection relationship between the rotating seat and the slot frame of the present invention.

[0030] Figure 5 It is a structural schematic diagram of the guide hole of the present invention.

[0031] Figure 6 It is a schematic diagram of the connection relationship between the first bullet head and the first slide groove surface of the present invention.

[0032] Figure 7 It is a schematic diagram of the connection relationship between the slot frame and the handle shell of the present invention.

[0033] In the figure, 100, handle housing; 110, avoidance groove; 200, groove frame; 210, arc-shaped portion; 220, first slide groove surface; 221, gear groove; 230, limit block; 300, rotating seat; 310, first bullet head; 311, first elastic member; 320, travel block; 330, guide hole; 331, embedded portion; 340, dial button; 400, adjustment knob; 410, rotating shaft; 420, second bullet head; 421, second elastic member. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] like Figure 1-7As shown, a combination switch handle comprises: a handle housing 100; a slot frame 200, the slot frame 200 is fixedly installed in the handle housing 100, the slot frame 200 comprises an arc portion 210, the arc portion 210 is arranged as a circular arc plate structure with the central axis of the slot frame 200 as the center, the end surface of the arc portion 210 is provided with a first slide groove surface 220, the first slide groove surface 220 has at least two gear grooves 221; a rotating seat 300, the rotating seat 300 is installed in the handle housing 100, and the rotating seat 300 can be rotatably connected with the slot frame 200. The rotating seat 300 is connected to the slot frame 200, the rotating seat 300 is equipped with a first bullet head 310, the first bullet head 310 is arranged to extend along the axial direction of the rotating seat 300, the top of the first bullet head 310 is in contact with the first slide groove surface 220, the first bullet head 310 is provided with a first elastic member 311, and the first elastic member 311 is connected to the slot frame 200; when the rotating seat 300 rotates, the first bullet head 310 slides along the first slide groove surface 220, and the first bullet head 310 can be retracted and retracted along the axial direction of the rotating seat 300 through the first elastic member 311.

[0036] The handle housing 100 is the shell structure of the switch handle; the slot frame 200 is fixedly installed in the handle housing 100, and is used to provide a first slide groove surface 220, wherein the slot frame 200 has an arc portion 210, which is actually an arc-shaped curved plate structure, and the first slide groove surface 220 is arranged on the end surface of the arc portion 210. The gear slot 221 on the first slide groove surface 220 defines different positions or states that the rotating seat 300 can switch. The first bullet head 310 can be extended and retracted along the trajectory shape of the first slide 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 by rotating. The first bullet head 310 can provide the rotating seat 300 with a switching feel and operating feedback. In the actual structure, the rotating seat 300 is given the function of controlling the rear wiper, and the rear wiper can be stopped or operated by the rotating seat 300.

[0037] Traditional bullet heads are arranged radially, which means that this design will occupy a large amount of radial space in the handle, making the outer diameter 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 be tightly pressed against the first slide groove surface 220 under the action of the first elastic member 311, and the first bullet head 310 is only allowed to expand and contract 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 demand for radial space in the handle, and thus making the handle more slender.

[0038] It should be pointed out that in the limited space in the car, especially near the steering wheel column, every millimeter of space is very valuable. This compact and slim combination switch handle design allows more control elements to be integrated into the cockpit or additional safety features to be added without sacrificing functionality. And the slimmer handle shape is consistent with the design trend of modern car interiors, which can provide a smoother and simpler visual effect. And this combination switch handle 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.

[0039] When the rotating seat 300 rotates, the first bullet head 310 moves along the trajectory shape of the first slide groove surface 220, and the first bullet head 310 can be extended and retracted by the first elastic member 311 to allow it to switch between various 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 operational feel and achieve accurate and repeatable position control.

[0040] like Figure 1-4 As shown, on the basis of the above-mentioned embodiment, one of the rotating seat 300 and the slot frame 200 is provided with two travel blocks 320 and the other is provided with a limit block 230, and the limit block 230 is located between the two travel blocks 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 abutted and connected with one travel block 320, and when the rotating seat 300 rotates to the other travel limit position, the limit block 230 is abutted and connected with the other travel block 320.

[0041] Two travel blocks 320 are arranged on one of the rotating seat 300 and the slot frame 200, and the two travel blocks 320 define the maximum angle range in which the rotating seat 300 can rotate, that is, two travel limit positions. The function of the travel block 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 another component of the rotating seat 300 and the slot frame 200, and is located between the above-mentioned two travel blocks 320. When the rotating seat 300 rotates to one of the travel limit positions, the limit block 230 will contact one of the travel blocks 320, thereby preventing the rotating seat 300 from rotating further.

[0042] On the basis of the above-mentioned embodiment, the first chute surface 220 is set to a curved surface structure with a W-shaped trajectory. The W-shaped curved surface structure has two trough positions (i.e., the positions of the two gear slots 221). Through the W-shaped curved surface design, the switching of the rotating seat between each gear slot 221 will have an obvious resistance change, which provides the driver with clear operational feedback, so that each switch can feel a clear position change. 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 to the nearest valley bottom (gear slot 221). This is because any position on the slope is not a stable balance point, and the first bullet head 310 will naturally find the nearest low point, i.e., 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, thereby improving the accuracy of the operation. When the switching function is required, the rotating seat 300 requires a large torque to enable the first bullet head 310 to leave the gear slot 221.

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

[0044] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, on the basis of the above embodiment, a guide hole 330 is opened on the end face of the rotating seat 300 along its axial direction, and the first elastic member 311 and the first bullet head 310 are both installed in the guide hole 330, and one end of the first elastic member 311 is in contact with the bottom of the guide hole 330 and the other end is in contact with the first bullet head 310.

[0045] The first elastic member 311 and the first bullet head 310 are both installed in the guide hole 330. This design ensures that the first bullet head 310 can be extended and retracted in the axial direction and always keep in contact with the first slide groove surface 220. The design of the guide hole 330 ensures that the bullet head can only move in the axial direction, but not in the radial direction or other directions.

[0046] Based on the above embodiment, the opening of the guide hole 330 has an embedding portion 331, which is arranged as an arc-shaped structure with the central axis of the rotating seat 300 as the center. The rotating seat 300 is coaxially arranged with the groove frame 200, and the arc portion 210 is inserted into the embedding portion 331.

[0047] The purpose of providing the inlay portion 331 is to allow the arc portion 210 to be inserted into the inlay portion 331 and maintain a stable connection, so that the first bullet head 310 can directly dock with the first slide groove surface 220. Since the inlay portion 331 and the arc portion 210 are both arc-shaped structures with the central axis of the rotating seat 300 and the slot frame 200 as the center, when the rotating seat 300 rotates, the arc portion 210 of the slot frame 200 can move smoothly along the inlay portion 331 without friction or jamming with the inlay 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] Since the two first chute surfaces 220 and the two first bullet heads 310 are symmetrically arranged, the entire structure is more balanced and stable when rotating. The symmetrical design can reduce the deviation or tilt caused by uneven force on one side, ensuring stability during operation. The design of the double first chute surfaces 220 and the double first bullet heads 310 provides more contact points, thereby improving the accuracy of position control. The two first bullet heads 310 move along their respective chute surfaces at the same time, which can more accurately determine the position of the rotating seat 300 and reduce the error that may be caused by a single bullet head.

[0050] like Figure 1-3 As shown, on the basis of the above-mentioned embodiment, a dial button 340 is arranged on the circumference of the rotating seat 300, and the handle housing 100 is provided with an escape groove 110, and the dial button 340 is located in the escape groove 110. The dial button 340 is installed on the circumference of the rotating seat 300, and the user can rotate the rotating seat 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 escape 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 adjusting knob 400 is installed at the end of the handle housing 100, and one of the adjusting 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 wiper and the rear wiper are integrated on one combination switch handle, which improves the integration of the combination switch. The user can conveniently control the front and rear wipers through the same handle without switching between different switches. In a specific structure, the user can control different modes (such as intermittent, low speed, high speed) of the rear wiper by turning the dial button 340 on the rotating seat 300; the user can control different modes (such as intermittent, low speed, high speed) of the front wiper by rotating the adjustment knob 400 at the end of the handle housing 100.

[0053] On the basis of the above embodiment, a rotatable rotating shaft 410 is installed in the handle housing 100, and the rotating shaft 410 is circumferentially fixedly connected to the adjusting knob 400. A second bullet head 420 is installed on the rotating shaft 410, and the second bullet head 420 is arranged to extend radially along the rotating shaft 410. The second bullet head 420 is provided with a second elastic member 421, and the second elastic member 421 is connected to the rotating shaft 410. The inner circumferential surface of the handle housing 100 is provided with a second slide groove surface, and the second bullet head 420 is in contact with the second slide groove surface; when the adjusting knob 400 is rotated, the second bullet head 420 slides along the second slide groove surface, and the second bullet head 420 can be extended and retracted radially along 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 wiper. The second bullet head 420 on the rotating shaft 410 is designed as a radial arrangement 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 to a radial arrangement structure. The end of the switch handle is slightly thicker and does not affect the use effect.

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

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

[0057] In the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited.

[0058] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A combination switch handle, characterized in that: include: Handle housing (100); A slot frame (200), the slot frame (200) is fixedly installed in the handle housing (100), the slot frame (200) comprises an arc portion (210), the arc portion (210) is arranged as an arc-shaped plate-like structure with the central axis of the slot frame (200) as the center, the end surface of the arc portion (210) is provided with a first slide groove surface (220), and the first slide groove surface (220) has at least two gear grooves (221); A rotating seat (300), the rotating seat (300) is installed in the handle housing (100), and the rotating seat (300) is rotatably connected to the slot frame (200), the rotating seat (300) is equipped with a first bullet head (310), the first bullet head (310) is arranged along the axial extension of the rotating seat (300), the top end of the first bullet head (310) is in contact with the first slide groove surface (220), and the first bullet head (310) is provided with a first elastic member (311), and the first elastic member (311) is connected to the slot frame (200); When the rotating seat (300) rotates, the first bullet head (310) slides along the first slide groove surface (220), and the first bullet head (310) can be extended and retracted along the axial direction of the rotating seat (300) through the first elastic member (311).

2. A combination switch handle according to claim 1, characterized in that: One of the rotating seat (300) and the slot frame (200) is provided with two travel blocks (320) and the other is provided with a limit block (230), wherein the limit block (230) is located between the two travel blocks (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 with one travel block (320), and when the rotating seat (300) rotates to the other travel limit position, the limit block (230) is in contact with the other travel block (320).

3. A combination switch handle according to claim 1, characterized in that: The first slide groove surface (220) is configured as a curved surface structure with a W-shaped trajectory.

4. A combination switch handle as claimed in claim 3, characterized in that: The rotating seat (300) is provided with a magnetic part, a circuit board is provided in the handle housing (100), a Hall sensor element is provided on the circuit board, and the Hall sensor element is configured to sense the angular position of the magnetic part and output a corresponding electrical signal.

5. A combination switch handle according to claim 1, characterized in that: The end surface of the rotating seat (300) is provided with a guide hole (330) along its axial direction, and the first elastic member (311) and the first bullet head (310) are both installed in the guide hole (330), and one end of the first elastic member (311) is in contact with the bottom of the guide hole (330) and the other end is in contact with the first bullet head (310).

6. A combination switch handle as claimed in claim 5, characterized in that: The opening of the guide hole (330) has an embedding portion (331), and the embedding portion (331) is arranged 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 groove frame (200) are coaxially arranged, and the arc portion (210) is inserted into the embedding portion (331).

7. A combination switch handle according to any one of claims 1 to 6, characterized in that: 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 groove 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. The two first bullet heads (310) are respectively in contact with the two first slide groove surfaces (220).

8. A combination switch handle according to claim 1, characterized in that: A dial button (340) is arranged on the circumferential surface of the rotating seat (300), a clearance groove (110) is provided on the handle housing (100), and the dial button (340) is located in the clearance groove (110).

9. A combination switch handle according to claim 1, characterized in that: 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 seat (300) is configured to control the front wiper and the other is configured to control the rear wiper.

10. A combination switch handle according to claim 9, characterized in that: A rotatable rotating shaft (410) is installed in the handle housing (100), and the rotating shaft (410) is fixedly connected to the adjusting knob (400) in the circumferential direction. A second bullet head (420) is installed on the rotating shaft (410), and the second bullet head (420) is arranged to extend radially along the rotating shaft (410). The second bullet head (420) is provided with a second elastic member (421), and the second elastic member (421) is connected to the rotating shaft (410). The inner circumferential surface of the handle housing (100) is provided with a second slide groove surface, and the second bullet head (420) is abutted against the second slide groove surface; when the adjusting knob (400) is rotated, the second bullet head (420) slides along the second slide groove surface, and the second bullet head (420) can be extended and retracted radially along the rotating shaft (410) through the second elastic member (421).

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