Automatic choke device, carburetor and garden tool

Abstract

The present invention provides an automatic choke device, a carburetor and a garden tool. The automatic choke device includes a throttle adjusting member for adjusting the throttle switch state, and a choke adjusting member for adjusting the choke switch state; and also includes a first linkage member for the throttle adjusting member to drive the choke adjusting member, the first linkage member is arranged between the throttle adjusting member and the choke adjusting member, and the force arm when the first linkage member is driven is greater than the force arm when the choke adjusting member is driven. The automatic choke device of the present invention realizes the instant adjustment of the choke from a fully closed state to a fully open state without the aid of other devices, and has a compact structure and low cost.

Description

Technical Field

[0001] The invention relates to an automatic choke device, a carburetor and a garden tool. Background Art

[0002] When a fuel garden tool is started, the choke of the carburetor is usually in a fully closed state, which is conducive to the starting of the engine. However, after the engine is started, the choke device cannot be adjusted from the fully closed state to the fully open state immediately. The current practice is to wait for the engine to run for a period of time before using a thermostat or other device to make the choke reach the fully open state, which is not only complex in structure but also high in cost.

[0003] Moreover, after the garden tool is started, the choke cannot be switched to the fully open state immediately, which has a certain impact on increasing the output of the engine power and reduces the user experience. Summary of the invention

[0004] In order to solve the above technical problems, the present invention installs an automatic choke device on a carburetor.

[0005] The technical solution adopted by the automatic choke device is as follows: comprising a throttle adjusting member, the throttle adjusting member is connected to the throttle for adjusting the switch of the throttle; comprising a choke adjusting member, the choke adjusting member is connected to the choke for adjusting the switch of the choke; a first linkage member is arranged between the throttle adjusting member and the choke adjusting member, the first linkage member is used for the throttle adjusting member to drive the choke adjusting member; the force arm when the first linkage member is driven is greater than the force arm when the choke adjusting member is driven. In this solution, when the throttle adjusting member adjusts the throttle, the first linkage member is used to realize linkage adjustment of the choke, and at the same time, because the force arm when the choke adjusting member is driven is smaller, the choke is adjusted to a relatively larger amplitude or the choke rotates at a larger angle.

[0006] Further, the throttle valve adjusting member drives the first linkage member, thereby driving the air-choke valve adjusting member in linkage.

[0007] Furthermore, the first linkage member includes a first linkage arm, and the first linkage arm is connected to the choke adjustment member; a force arm when the first linkage arm is driven is greater than a force arm when the choke adjustment member is driven.

[0008] Preferably, a linkage rod is provided between the first linkage arm and the choke adjusting member, and two ends of the linkage rod are respectively connected to the first linkage arm and the choke adjusting member.

[0009] Preferably, a limiting recess is provided at one end of the first linkage arm, a limiting convex is provided on the choke adjustment member, and a top end of the limiting convex is arranged in the limiting recess.

[0010] Furthermore, a second linkage member is provided between the throttle adjustment member and the first linkage member, and the second linkage member is used for the throttle adjustment member to drive the first linkage member toward a first direction so as to open the choke.

[0011] Preferably, a limiting portion is provided at the choke adjusting member, and the limiting portion is used to limit the choke adjusting member; the second linkage member is an elastic member, and the elastic member is used to ensure that the throttle adjusting member still has a certain amount of rotation in the first direction after the choke adjusting member is limited. In this solution, after the choke is adjusted to the right position, the throttle still has a certain amount of adjustment.

[0012] Preferably, the second linkage member is a tension spring, and the two ends of the tension spring are respectively connected to the throttle adjusting member and the first linkage member; or, the second linkage member is a torsion spring, the main body of the torsion spring is sleeved on the rotating shaft of the throttle adjusting member, and the two ends of the torsion spring are respectively connected to the throttle adjusting member and the first linkage member.

[0013] Furthermore, a third linkage member is provided between the throttle adjustment member and the first linkage member, and the third linkage member is used for the throttle adjustment member to drive the first linkage member in the second direction so as to close the choke. In this solution, a third linkage member for closing the choke is provided separately, ensuring that the closure of the choke is conducive to the next start of the engine.

[0014] Furthermore, the throttle adjusting member is connected to the throttle rotating shaft, and the switch of the throttle is adjusted by driving the throttle rotating shaft to rotate; the choke adjusting member is connected to the choke rotating shaft, and the switch of the choke is adjusted by driving the choke rotating shaft to rotate.

[0015] In another aspect, the present invention provides a carburetor comprising the carburetor choke linkage device of the present invention.

[0016] In a third aspect, the present invention provides a garden tool including the carburetor of the present invention, the garden tool also includes a speed regulating lever, the speed regulating lever is connected to the throttle regulating member, and the speed regulating lever is used to drive the throttle regulating member to adjust the opening and closing of the throttle. In this solution, the speed regulating lever drives the throttle regulating member, and the speed regulating lever adjusts the engine output power while realizing the linkage adjustment of the choke.

[0017] The advantage of the present invention is that there is no need to provide an additional device to adjust the choke valve, and while the throttle valve is relatively slightly adjusted, a relatively large adjustment of the choke valve is achieved, and the structure is compact and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an embodiment of an automatic choke device installed in a carburetor rear choke fully open state.

[0019] Figure 2 for Figure 1 A schematic structural diagram of a throttle adjustment member in an embodiment.

[0020] Figure 3 for Figure 1 A schematic structural diagram of the choke adjustment member in an embodiment.

[0021] Figure 4 This is a schematic diagram of the structure of an embodiment of an automatic choke device installed in a carburetor with the rear choke in a fully closed state.

[0022] Figure 5 It is a schematic structural diagram of an embodiment of a first linkage arm.

[0023] Figure 6 It is a structural schematic diagram of a carburetor embodiment.

[0024] Figure 7 for Figure 6 A schematic diagram of the structure when the first linkage arm, the choke valve adjusting member and the throttle valve adjusting member in the embodiment are not installed on the carburetor.

[0025] Figure 8 It is a structural schematic diagram of the carburetor embodiment after being installed on the garden tool.

[0026] Fig. 9 It is a schematic structural diagram of another first linkage arm embodiment.

[0027] Fig.10 It is a schematic structural diagram of a carburetor embodiment on the choke side.

[0028] Fig.11 It is a schematic structural diagram of a carburetor embodiment on the throttle side.

[0029] Description of reference numerals:

[0030] 1-carburetor, 11-choke, 11a-choke rotating shaft, 11b-small triangular prism block, 11c-large triangular prism block, 12-throttle, 12a-throttle rotating shaft, 12b-fastener;

[0031] 21-throttle valve adjusting member, 21a-rotating shaft of the throttle valve adjusting member,

[0032] 22-choke valve adjusting member, 22a-rotating shaft of the choke valve adjusting member,

[0033] 23-first linkage member, 24-first linkage arm, 24a-fixing hole, 24b-connecting hole, 24c-limiting concave portion, 24d-second end of the first linkage arm, 25-linkage rod, 25a-first end of the linkage rod, 25b-second end of the linkage rod, 26-limiting convex portion;

[0034] 3-limiting column, 4-first limiting arm, 5-second limiting arm;

[0035] 6-second linkage member, 61-body of torsion spring, 62-first end of torsion spring, 63-second end of torsion spring;

[0036] 7-third linkage, 8-speed regulating lever. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. Obviously, the same components between different embodiments can be replaced with each other on the premise of ensuring the realization of the functions.

[0038] like Figure 1 As shown, the carburetor 1 includes a carburetor body, a choke 11 and a throttle 12, and the choke 11 and the throttle 12 are arranged inside the carburetor body. In the carburetor 1 of this embodiment, the choke 11 and the throttle 12 are located at both ends of the carburetor body, and the positions of the two in other carburetors 1 can be changed.

[0039] The linkage device of the choke valve 11 of the carburetor 1 comprises a throttle valve adjusting member 21 , a choke valve adjusting member 22 and a first linkage member 23 .

[0040] Combination Figure 2 , Figure 3As shown, the throttle adjusting member 21 is connected to the throttle 12 for adjusting the switch of the throttle 12, and the choke adjusting member 22 is connected to the choke 11 for adjusting the switch of the choke 11. In one embodiment, the throttle adjusting member 21 is connected to the throttle rotating shaft 12a, and the throttle adjusting member 21 drives the throttle rotating shaft 12a to rotate and adjust the switch of the throttle 12. In another embodiment, the throttle adjusting member 21 and the throttle rotating shaft 12a are integrally formed, that is, the throttle adjusting member 21 and the throttle 12 are arranged on the same rotating shaft, and the throttle 12 is fixed on the throttle rotating shaft 12a located in the carburetor body, and can be fixed with fasteners 12b such as bolts for easy installation.

[0041] Similarly, the choke adjusting member 22 can be connected to the choke rotating shaft 11a, and the choke adjusting member 22 drives the choke rotating shaft 11a to rotate and adjust the opening and closing of the choke 11. The choke adjusting member 22 can be integrally formed with the choke rotating shaft 11a, or can be fixed with fasteners 12b such as bolts for easy installation. In another embodiment, a plug-in hole can be provided on the choke rotating shaft 11a, and the choke 11 can be directly inserted into the plug-in hole. The choke 11 and the plug-in hole are interference fit, which reduces the fasteners 12b, reduces the cost, and is more convenient to install. Obviously, the throttle 12 and the throttle rotating shaft 12a can also be interference fit.

[0042] The first linkage member 23 is arranged between the throttle adjusting member 21 and the choke adjusting member 22, and is used for the throttle adjusting member 21 to drive the choke adjusting member 22. The throttle adjusting member 21 drives the first linkage member 23, thereby driving the choke adjusting member 22 in linkage, and the choke adjusting member 22 can adjust the choke 11 after being driven, so that when the throttle adjusting member 21 adjusts the opening and closing degree of the throttle 12, the linkage between the throttle adjusting member 21 and the choke 11 is realized, that is, the opening and closing degree of the choke 11 is also adjusted at the same time. In addition, the force arm when the first linkage member 23 is driven by the throttle adjusting member 21 is greater than the force arm when the choke adjusting member 22 is driven by the first linkage member 23, so that when the throttle adjusting member 21 gives a smaller force to the first linkage member 23, the choke adjusting member 22 will be linked to receive a larger force due to the torque, so that when the throttle 12 is opened and closed by a smaller amplitude, the adjustment amplitude of the opening and closing state of the choke 11 will be larger.

[0043] Combination Figure 4 As shown, a limit column 3 is provided at the choke adjusting member 22, and a first limit arm 4 and a second limit arm 5 are provided on the choke adjusting member 22. In one embodiment, after the engine is started, when the throttle adjusting member 21 adjusts to open the throttle 12, the choke adjusting member 22 is driven by the linkage action of the first linkage member 23 and the first limit arm 4 is immediately blocked by the limit column 3, as shown in FIG. Figure 1The function of adjusting the choke valve 11 from the fully closed state before the engine is started to the fully open state is realized.

[0044] In another embodiment, when the throttle adjusting member 21 adjusts and closes the throttle valve 12 to a certain extent, the choke adjusting member 22 will be driven by the linkage action of the first linkage member 23, and the second limiting arm 5 is blocked by the limiting column 3, such as Figure 4 At this time, the choke valve 11 is adjusted from the fully open state to the fully closed state, and the choke valve 11 can be kept in the fully closed state after the engine is turned off, ensuring that the choke valve 11 is in the fully closed state when the engine is started next time, which is beneficial to the engine starting. Obviously, the maximum degree of opening or closing of the choke valve 11 can be adjusted by setting the position of the limit column 3 differently.

[0045] The first linkage member 23 can be implemented in various ways.

[0046] In the first embodiment, Figure 4 , Figure 5 As shown, the first linkage member 23 includes a first linkage arm 24, a linkage rod 25 is provided between the first linkage arm 24 and the choke adjusting member 22, and the two ends of the linkage rod 25 are respectively connected to the first linkage arm 24 and the choke adjusting member 22. A fixing hole 24a is provided at the approximate middle of the first linkage arm 24, and the fixing hole 24a is sleeved on the rotating shaft 21a of the throttle adjusting member. A connecting hole 24b is provided at the first end of the first linkage arm 24 for connecting with the first end 25a of the linkage rod, and the second end 24d of the first linkage arm is connected to the throttle adjusting member 21.

[0047] When the throttle adjustment member 21 is driven, the second end 24d of the first linkage arm is driven so that both ends of the first linkage arm 24 rotate around the fixing hole 24a. At this time, the first end of the first linkage arm 24 drives the linkage rod 25 so that the choke adjustment member 22 connected to the second end 25b of the linkage rod is also driven. The distance from the first end of the first linkage arm 24 to the fixing hole 24a is greater than the distance from the second end 25b of the linkage rod to the rotation axis 22a of the choke adjustment member, thereby ensuring that the force arm when the first linkage arm 24 is driven is greater than the force arm when the choke adjustment member 22 is driven.

[0048] When Figure 5 The fixing hole 24a shown is the center, and when the first end of the first linkage arm 24 rotates clockwise, Figure 4The choke 11 in the air flow direction can be opened immediately. When the limit column 3 is set at the position where the choke 11 is fully opened, the throttle adjustment member 21 can be linked to fully open the choke 11. In this embodiment, the throttle adjustment member 21 rotates concentrically with the center to drive the first linkage arm 24 to rotate. Obviously, in some embodiments, the rotation center of the throttle adjustment member 21 is not concentric with the fixing hole 24a.

[0049] In the second embodiment, if Figure 6 , Figure 7 As shown, the first section is from the fixing hole 24a of the first linkage arm 24 to the first end, and the second section is from the fixing hole 24a of the first linkage arm 24 to the second end. Obviously, in terms of the angle between the two sections, the first embodiment is significantly smaller than the second embodiment; and the linkage rod 25 in the second embodiment is also longer than the linkage rod 25 in the first embodiment. From the difference between the above schemes, the structure of the first embodiment is more compact, while the structure of the first linkage arm 24 of the second embodiment is relatively simple and easier to manufacture. Similarly, the distance from the first end of the first linkage arm 24 to the fixing hole 24a is greater than the distance from the second end of the linkage rod 25 to the rotating shaft 22a of the choke adjusting member, thereby ensuring that the force arm when the first linkage arm 24 is driven is greater than the force arm when the choke adjusting member 22 is driven.

[0050] For the choke valve adjusting member 22 and the throttle valve adjusting member 21 in the second embodiment, compared with Figure 2 and Figure 3 The structure is simpler. The fixing method between the choke 11 and the choke rotating shaft 11a is also different. Relative large and small right-angled triangular prism blocks are set on the choke 11. When installing, the inclined surface of the small triangular prism block 11b can be inserted into the installation hole of the choke rotating shaft 11a. After being inserted into place, the vertical backs of the large triangular prism block 11c and the small triangular prism block 11b jointly resist the choke rotating shaft 11a. The large and small right-angled triangular prism blocks in this solution also have an anti-fool effect.

[0051] In the third embodiment, Figure 8 , Fig. 9 As shown, the first end of the first linkage arm 24 is a limiting recess 24c, and a limiting protrusion 26 is provided on the choke adjustment member 22, and the top end of the limiting protrusion 26 is placed in the limiting recess 24c. Similarly, the distance from the limiting recess 24c to the fixing hole 24a is greater than the distance from the limiting protrusion 26 to the rotating shaft 22a of the choke adjustment member, so as to ensure that the force arm when the first linkage arm 24 is driven is greater than the force arm when the choke adjustment member 22 is driven. The limiting recess 24c can be a limiting hole, and the limiting hole can be elliptical. The limiting recess 24c can also be a limiting groove, and the limiting groove can be elliptical. The limiting protrusion 26 can be integrally formed with the choke adjustment member 22, and the limiting protrusion 26 can be arranged in the middle of the choke adjustment member 22.

[0052] The throttle adjusting member 21 can be directly connected to the first linkage member 23 to drive the first linkage member 23 or drive the first linkage member 23 to rotate. A second linkage member 6 can also be added between the first linkage member 23 and the throttle adjusting member 21 to achieve linkage between the two. At least, the second linkage member 6 can be used for the throttle adjusting member 21 to drive the first linkage member 23 in a first direction to open the choke 11. Obviously, the connection method between the first linkage member 23 and the throttle adjusting member 21 can refer to the connection method of the above three embodiments, for example, the second linkage member 6 is a connecting rod; this embodiment can realize that the throttle adjusting member 21 drives the first linkage member 23 in another direction to close the choke 11. Here, the direction when the throttle adjusting member 21 is driven is the direction to realize linkage opening or closing of the choke 11, and it is not a specific direction.

[0053] In some other embodiments, a limiting portion is provided at the choke adjusting member 22, and the limiting portion is used to limit the choke adjusting member 22; at the same time, the second linkage member 6 is an elastic member, and the elastic member is used to allow the throttle adjusting member 21 to have a certain amount of rotation in the first direction after the choke adjusting member 22 is limited. In some embodiments, when the choke 11 is in the fully open state during the opening process, the choke adjusting member 22 is limited by the limiting portion and stops rotating; at this time, when the throttle adjusting member 21 continues to rotate in the first direction, the choke 11 will not continue to rotate but maintain the fully open state, and because the second linkage member 6 is an elastic member, the throttle adjusting member 21 can also have a certain amount of rotation in the first direction, that is, the size of the throttle 12 can continue to be adjusted when the choke 11 is in the fully open state, such as continuing to open the throttle 12 until it reaches the fully open state. This solution can continue to adjust the throttle 12 while controlling the opening degree of the choke 11. In particular, when the limit choke 11 remains fully open and the throttle 12 is opened continuously, the output of the engine can be increased, thereby improving the user experience. Obviously, a limit structure can also be provided at the throttle adjusting member 21 to limit the opening degree of the throttle 12.

[0054] When the second linkage member 6 is an elastic member, there are also many implementation methods, and some embodiments are listed below.

[0055] In one embodiment, reference Figure 1 , Figure 4 , Figure 6 and Figure 8As shown, the second linkage member 6 is a tension spring, and the two ends of the tension spring are respectively connected to the throttle adjustment member 21 and the first linkage member 23, one end of which can be connected to one end of the throttle adjustment member 21, and the other end can be connected to the second end 24d of the first linkage arm. When the throttle adjustment member 21 is driven in the first direction, the elastic member is stretched to drive the second end 24d of the first linkage arm to rotate in or approximately in the first direction, so that the first end of the first linkage arm 24 rotates to achieve a linkage effect.

[0056] In another embodiment, reference Fig.10 , Fig.11 As shown, the second linkage member 6 is a torsion spring, the main body 61 of the torsion spring is sleeved on the rotating shaft 21a of the throttle adjusting member, and the two ends of the torsion spring are respectively connected to the throttle adjusting member 21 and the first linkage member 23. Specifically, the main body 61 of the torsion spring is sleeved on the rotating shaft 21a of the throttle adjusting member. When the rotating shaft 21a of the throttle adjusting member is also the throttle rotating shaft 12a, the main body 61 of the torsion spring is also sleeved on the rotating shaft of the throttle 12; the first end 62 of the torsion spring is abutted at the second end 24d of the first linkage arm, and the second end 63 of the torsion spring is inserted into the fixing hole 24a of the first linkage arm 24 and is on the first section of the first linkage arm 24; when the throttle adjusting member 21 rotates in the first direction, the first end 62 of the torsion spring is also driven to rotate in or approximately in the first direction. At this time, the second end 63 of the torsion spring will drive the first linkage arm 24 to rotate in the same or approximately the same direction as the first direction, thereby realizing the linkage between the throttle adjusting member 21 and the choke adjusting member 22.

[0057] On the other hand, as far as the throttle adjusting member 21 is linked to close the choke 11 or to gradually close the choke 11, it can also be achieved by adding a third linkage member 7. In a specific embodiment, a third linkage member 7 is arranged between the throttle adjusting member 21 and the first linkage member 23, and the third linkage member 7 is used for the throttle adjusting member 21 to drive the first linkage member 23 toward the second direction to close the choke 11. Here, the direction in which the throttle adjusting member 21 is driven is the direction to achieve the linkage closure of the choke 11, and is not a specific direction. The third linkage member 7 can be a resisting arm, which is located in the space between the second section of the first linkage arm 24 and the throttle adjusting member 21, and one end of the resisting arm is connected to the throttle adjusting member 21 or the resisting arm and the throttle adjusting member 21 are integrally formed.

[0058] Obviously, the third linkage member 7 and the limiting portion at the choke adjusting member 22 may also cooperate with each other, so as to determine the degree to which the third linkage member 7 links to close the choke 11, for example, the choke 11 is in a fully closed state.

[0059] In addition, for the carburetor 1 provided with the above-mentioned carburetor 1 choke 11 linkage device, there are other implementations for the positions of the choke adjusting member 22 and the throttle adjusting member 21 on the carburetor body, and they do not have to be arranged on the same side.

[0060] As for the garden tool equipped with the above carburetor 1, in some embodiments, reference Figure 8 As shown, the speed regulating lever 8 and the throttle regulating member 21 can be connected, and the speed regulating lever 8 is used to drive the throttle regulating member 21 to adjust the switch of the throttle 12, and at the same time become the external force source for the linkage adjustment of the choke 11. Of course, the throttle regulating member 21 as the linkage adjustment of the choke 11 can also be connected with other speed regulating structures, such as a speed regulating switch, a speed regulating paddle, etc. The garden tool can be a lawn mower, a snow sweeper, a grass comber, etc.

[0061] The above-mentioned embodiments are preferred implementation modes of the present application and are only used to facilitate the explanation of the present application. They are not intended to limit the present application in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present application, can make equivalent embodiments by making partial changes or modifications to the technical contents disclosed in the present application and do not depart from the technical features of the present application. All of these still fall within the scope of the technical features of the present application.

Claims

1. A carburetor choke linkage device, characterized in that: It includes a throttle adjusting member, wherein the throttle adjusting member is connected to the throttle and is used to adjust the switch of the throttle; A choke adjusting member is included, wherein the choke adjusting member is connected to the choke for adjusting the switch of the choke; A first linkage member is provided between the throttle adjusting member and the choke adjusting member, and the first linkage member is used for the throttle adjusting member to drive the choke adjusting member; The force arm when the first linkage member is driven is greater than the force arm when the choke valve adjustment member is driven; A second linkage member is disposed between the throttle adjustment member and the first linkage member, and the second linkage member is used for the throttle adjustment member to drive the first linkage member toward a first direction so as to open the air choke; A limiting portion is provided at the choke adjusting member, the limiting portion is used to limit the choke adjusting member; the second linkage member is an elastic member, the elastic member is used to enable the throttle adjusting member to rotate in the first direction after the choke adjusting member is limited; The throttle adjustment member drives the first linkage member, thereby driving the choke adjustment member in linkage; The first linkage member includes a first linkage arm, and the first linkage arm is connected to the choke adjusting member; the force arm when the first linkage arm is driven is greater than the force arm when the choke adjusting member is driven.

2. The carburetor choke linkage device according to claim 1, characterized in that: A linkage rod is provided between the first linkage arm and the choke adjusting member, and two ends of the linkage rod are respectively connected to the first linkage arm and the choke adjusting member.

3. The carburetor choke linkage device according to claim 1, characterized in that: A limiting recess is arranged at one end of the first linkage arm, a limiting convex portion is arranged on the choke adjustment member, and a top end of the limiting convex portion is arranged in the limiting recess.

4. The carburetor choke linkage device according to claim 1, characterized in that: The second linkage member is a tension spring, and the two ends of the tension spring are respectively connected to the throttle adjusting member and the first linkage member; or, the second linkage member is a torsion spring, the main body of the torsion spring is sleeved on the rotating shaft of the throttle adjusting member, and the two ends of the torsion spring are respectively connected to the throttle adjusting member and the first linkage member.

5. The carburetor choke linkage device according to claim 1, characterized in that: A third linkage member is further provided between the throttle adjustment member and the first linkage member, and the third linkage member is used for the throttle adjustment member to drive the first linkage member toward a second direction so as to close the air choke.

6. The carburetor choke linkage device according to claim 1, characterized in that: The throttle adjusting member is connected to the throttle rotating shaft, and the switch of the throttle is adjusted by driving the throttle rotating shaft to rotate; the choke adjusting member is connected to the choke rotating shaft, and the switch of the choke is adjusted by driving the choke rotating shaft to rotate.

7. A carburetor, characterized in that: A carburetor choke linkage device comprising any one of claims 1 to 6.

8. A garden tool, characterized in that: It comprises the carburetor and speed regulating lever as claimed in claim 7, wherein the speed regulating lever is connected to the throttle regulating member, and the speed regulating lever is used to drive the throttle regulating member to adjust the opening and closing of the throttle.

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