Auxiliary wheel mechanism of grass trimmer

Abstract

The utility model discloses an auxiliary wheel mechanism of a grass trimmer, the grass trimmer comprises a grass trimming head, an auxiliary wheel mechanism and a locking assembly, the grass trimming head is detachably connected with the auxiliary wheel mechanism through the locking assembly, the auxiliary wheel mechanism comprises a supporting column detachably connected with the grass trimming head, and the supporting column is detachably connected with the grass trimming head. At least part of the supporting column can be inserted into the grass trimming head; the locking assembly comprises a pressing button and a second elastic element, one end of the second elastic element abuts against the locking assembly, and the other end of the second elastic element abuts against the supporting column. The pressing button is integrally formed and comprises a clamping part and a pressing part. The height of the auxiliary wheel can be adjusted, the grass trimming head and the auxiliary wheel are simply disassembled, and disassembly, transportation and storage are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to an auxiliary wheel mechanism of a lawn mower. Background Art

[0002] With the rapid development of society, people are paying more and more attention to the ecological environment, and greening awareness has gradually taken root in people's hearts. Green grass has almost completely covered every corner of life in the city. While bringing vitality and vigor to people, it also requires people to take good care of it to prevent the grass from growing disorderly.

[0003] A lawn mower is used to conveniently trim grass or plants on a lawn. However, the intervals between trimming work are usually long, so the lawn mower needs to be stored frequently. However, the lawn mower is relatively large and inconvenient to transport and store. Currently, the auxiliary wheels of a general lawn mower are fixed to the mowing head by fixing them to the outer shell of the lawn mower. However, this fixing method requires that the entire mowing head and the auxiliary wheels be disassembled when disassembly is required, which results in a complex structure and inconvenient disassembly. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides an auxiliary wheel mechanism for a grass trimmer, which can realize simple disassembly of the grass trimmer head and the auxiliary wheel, thereby facilitating transportation and storage.

[0005] The utility model is achieved through the following technical solutions:

[0006] An auxiliary wheel mechanism for a lawn mower, the lawn mower comprising a lawn mower head, an auxiliary wheel mechanism, and a locking assembly, the lawn mower head and the auxiliary wheel mechanism being detachably connected via the locking assembly, the auxiliary wheel mechanism comprising a support column detachably connected to the lawn mower head, the support column at least partially insertable into the lawn mower head; the locking assembly comprising a push button and a second elastic element, one end of the second elastic element abutting against the locking assembly and the other end abutting against the support column; the push button being integrally formed and comprising a clamping portion and a pressing portion;

[0007] When the user presses the pressing portion, the clamping portion moves into the support column and disengages from the grass trimming head;

[0008] When the user releases the pressing portion, the engaging portion moves toward the outside of the support column under the elastic force of the second elastic element so as to be exposed outside the support column and engage with the grass trimmer head.

[0009] Furthermore, the support column includes a docking portion that can be inserted into the interior of the grass trimmer head and a supporting portion located outside the grass trimmer head, the clamping portion is arranged on the docking portion, and the pressing portion is arranged on the supporting portion.

[0010] Furthermore, a third accommodating cavity is formed in the support column, and the push button is at least partially arranged in the third accommodating cavity, and the push button can slide along the inner wall of the third accommodating cavity in the length direction of the second elastic element, and the other end of the second elastic element abuts against the bottom wall of the third accommodating cavity.

[0011] Furthermore, the docking portion is provided with a first opening communicating with the third accommodating cavity, and the clamping portion can pass through the first opening and be exposed on the outside of the support column.

[0012] Furthermore, the support portion is provided with a second opening communicating with the third accommodating cavity, and the pressing portion can pass through the second opening and be exposed on the outside of the support column.

[0013] Furthermore, the push button further includes a connecting portion, which is arranged between the clamping portion and the pressing portion.

[0014] Furthermore, a limiting portion is provided between the first opening and the second opening, a first limiting groove is formed between the clamping portion, the pressing portion and the connecting portion, and the limiting portion is accommodated in the first limiting groove.

[0015] Furthermore, the first side surface and the second side surface of the first limiting groove are loosely matched with the limiting portion.

[0016] Furthermore, the clamping portion is formed with a sloped surface on one side facing the grass trimmer head. When the user inserts the docking portion into the grass trimmer head, the grass trimmer head abuts against the sloped surface and gradually applies thrust along the sloped surface. The push button moves toward the inside of the support column under the thrust of the grass trimmer head. When the docking portion is inserted into place, the grass trimmer head is disengaged from the sloped surface, and the push button is reset under the action of the second elastic element. At this time, the clamping portion is clamped with the grass trimmer head.

[0017] Furthermore, a curved surface and a flat surface are formed on the clamping portion, and the curved surface is located between the inclined surface and the flat surface, so that the process of the mowing head being separated from the inclined surface during clamping is smoother.

[0018] Furthermore, the push button is integrally formed and has a first groove formed toward the support column to reduce weight.

[0019] Furthermore, a third reinforcing rib is provided in the first groove to increase the strength of the push button.

[0020] Furthermore, a second protrusion is formed on the third reinforcing rib, and the second elastic element is sleeved on the second protrusion.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. By setting a clamping piece in the support column and providing at least two up-shifting holes on the clamping piece, the wheel axle is set to be detachable. At the same time, the wheel axle can be clamped with any up-shifting hole, so that the user can adjust the height of the auxiliary wheel through simple operation.

[0023] 2. By setting a push button and an elastic element between the push button and the support column, and providing a clamping part on the push button, the mechanism can be clamped with the grass trimming head through the clamping part, and the user can easily disassemble the grass trimming head and the auxiliary wheel mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an auxiliary wheel mechanism of a grass trimmer according to an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Exploded diagram;

[0026] Figure 3 for Figure 1 Schematic diagram of partial assembly;

[0027] Figure 4 This is a schematic diagram of the housing structure of an auxiliary wheel mechanism of a grass trimmer according to one embodiment of the utility model;

[0028] Figure 5 This is a cross-sectional view of a push button of an auxiliary wheel mechanism of a grass trimmer according to one embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the push button structure of an auxiliary wheel mechanism of a grass trimmer according to one embodiment of the utility model;

[0030] Figure 7 for Figure 6 Another perspective structural diagram;

[0031] Figure 8 This is a schematic diagram of a block structure of an auxiliary wheel mechanism of a grass trimmer according to an embodiment of the present utility model;

[0032] Figure 9 This is a schematic diagram of a baffle structure of an auxiliary wheel mechanism of a grass trimmer according to an embodiment of the present utility model;

[0033] Figure 10 This is an exploded view of the bottom wheel and wheel axle of an auxiliary wheel mechanism of a grass trimmer according to one embodiment of the utility model;

[0034] Figure 11The figure is a schematic diagram of the wheel axle structure of an auxiliary wheel mechanism of a grass trimmer according to one embodiment of the present utility model.

[0035] Explanation of reference numerals: 1. support column; 20. first housing; 21. second housing; 2. bottom wheel; 3. axle; 4. auxiliary wheel mechanism; 5. locking assembly; 11. first elastic element; 12. second accommodating chamber; 10. snap-fitting member; 101. upshifting hole; 102. stopper; 100. blocking piece; 13. first reinforcing rib; 107. first protrusion; 14. toggle button; 15. sliding groove; 103. second reinforcing rib; 104. first accommodating chamber; 106. stopper body; 30. insertion portion; 31. snap-fitting slot; 16. docking portion; 18. push button; 17. third accommodating chamber; 19. second elastic element; 180. snap-fitting portion; 181. pressing portion; 110. first hole; 166. supporting portion; 267. recess; 170. first screw hole; 171. screw column; 172. first screw; 202. first opening; 203. second opening; 183. connecting portion; 162. first limiting groove; 161. limiting portion; 167. first side surface; 169. second side surface; 188. avoidance groove; 182. third reinforcing rib; 184. second protrusion; 50. protrusion; 185. inclined surface; 186. curved surface; 187. plane; 168. height adjustment portion; 106. block body; 111. connecting portion; 112. opening; 108. fixing port; 109. second screw hole; 173. second screw; 105. abutting portion; 34. first plane; 35. second plane; 36. limiting ring; 201. lining; 206. wheel hub; 204. decorative cover; 207. anti-slip groove; 22. first groove; 37. second limiting groove; 32. bearing. DETAILED DESCRIPTION

[0036] The following is a further non-restrictive detailed description of the technical solution of the invention in conjunction with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] like Figure 1 and Figure 2 As shown, an auxiliary wheel mechanism of a grass trimmer according to an embodiment of the present invention, the grass trimmer includes a grass trimming head, an auxiliary wheel mechanism 4 and a locking assembly 5, and the grass trimming head and the auxiliary wheel mechanism 4 are detachably connected through the locking assembly 5.

[0038] The auxiliary wheel mechanism 4 includes a support column 1 detachably connected to the mowing head, a pair of bottom wheels 2 and a wheel axle 3 connected to the bottom wheels 2. The support column 1 can be at least partially inserted into the mowing head, and the bottom wheel 2 is detachably connected to the support column 1 through the wheel axle 3.

[0039] like Figure 5 and Figure 6 As shown, the locking assembly 5 includes a push button 18 and a second elastic element 19. One end of the second elastic element 19 abuts the locking assembly 5, and the other end abuts the support column 1. The push button 18 is integrally formed and includes a clamping portion 180 and a pressing portion 181. When the user presses the pressing portion 181, the clamping portion 180 moves inwardly toward the support column 1 and disengages from the mowing head. When the user releases the pressing portion 181, the clamping portion 180, under the elastic force of the second elastic element 19, moves toward the outside of the support column 1, becoming exposed outside the support column 1 and capable of engaging with the mowing head.

[0040] like Figure 3 、 Figure 4 and Figure 5 As shown, the support column 1 is connected to the grass trimmer head. A clamping member 10 and a first elastic element 11 are provided in the support column 1. One end of the first elastic element 11 abuts the support column 1, and the other end abuts the clamping member 10. The clamping member 10 is provided with at least two up-shift holes 101, which are arranged along the length of the support column 1. The end of the axle 3 away from the bottom wheel 2 can be inserted into the up-shift hole 101 and engaged with the clamping member 10. When the user needs to adjust the height, the clamping member 10 is moved so that the clamping member 10 overcomes the movement of the first elastic element 11. At this time, the axle 3 is disengaged from the clamping member 10, the axle 3 is pulled out, and then the axle 3 is inserted into another up-shift hole 101. The clamping member 10 is reset under the elastic action of the first elastic element 11, and the axle 3 is again engaged with the clamping member 10.

[0041] Specifically, the support column 1 includes a docking portion 16 that can be inserted into the mowing head, and a support portion 166 located outside the mowing head. A clamping portion 180 is provided on the docking portion 16, and a pressing portion 181 is provided on the support portion 166. The docking portion 16 is insertable into the mowing head and has a square cross-section for easy insertion and securement. The connection between the docking portion 16 and the support portion 166 is rounded inward to ensure that the curvature of the connection matches the curvature of the mowing head. Furthermore, a depression 267 is provided on the outer surface of the support portion 166, making the support column 1 appear more than a simple geometric shape, enhancing the aesthetics of the present invention.

[0042] A third accommodating cavity 17 is formed in the support column 1, and the other end of the second elastic element 19 abuts against the bottom wall of the third accommodating cavity 17. The push button 18 is at least partially arranged in the third accommodating cavity 17, and the push button 18 can slide along the inner wall of the third accommodating cavity 17 in the length direction of the second elastic element 19.

[0043] The support column 1 includes a first shell 20 and a second shell 21. The second shell 21 is formed with a plurality of first screw holes 170. The first shell 20 is formed with a plurality of screw posts 171 corresponding to the first screw holes 170. A plurality of first screws 172 are passed through the first screw holes 170. The first screws 172 are tightened with the screw posts 171 to securely connect the first shell 20 and the second shell 21 to form the support column 1. The docking portion 16 is provided with a first opening 202 that communicates with the third accommodating cavity 17. The engaging portion 180 can pass through the first opening 202 to be exposed on the outside of the support column 1. The supporting portion 166 is provided with a second opening 203 that communicates with the third accommodating cavity 17. The pressing portion 181 can pass through the second opening 203 to be exposed on the outside of the support column 1.

[0044] In this embodiment, a first opening 202 and a second opening 203 are formed on the first housing 20. In addition, the push button 18 further includes a connecting portion 183, which is integrally formed between the clamping portion 180 and the pressing portion 181. A first limiting groove 162 is formed between the clamping portion 180, the pressing portion 181, and the connecting portion 183. A limiting portion 161 is provided between the first opening 202 and the second opening 203, and is received in the first limiting groove 162. The first side surface 167 and the second side surface 169 forming the first limiting groove 162 are loosely matched with the limiting portion 161, so that when the push button 18 slides, it can only slide along the inner wall of the third accommodating cavity 17 along the length direction of the second elastic element 19, and during the sliding process, the limiting portion 161 limits the movement of the first limiting groove 162 so that the push button 18 where the first limiting groove 162 is located will not move along the length direction of the support column 1, which can make the removal or installation of the grass trimming head and the auxiliary wheel mechanism 4 more stable.

[0045] The push button 18 is integrally injection-molded and features a first groove 22 facing the support column 1 to reduce weight. Since first screw holes 170 are also provided on both sides of the third accommodating cavity 17, avoidance grooves 188 are provided on both side walls of the push button 18 to accommodate the first screw holes 170. Furthermore, a cross-shaped third reinforcing rib 182 is provided within the first groove 22 to increase the strength of the push button 18. A second protrusion 184 is formed on the third reinforcing rib 182, and the second elastic element 19 is sleeved onto the second protrusion 184, so that one end of the second elastic element 19 abuts the push button 18 and the other end abuts the bottom wall of the third accommodating cavity 17 on the second housing 21. Furthermore, in this embodiment, a plurality of semicircular protrusions 50 are evenly distributed on the surface of the pressing portion 181 facing outward from the support column 1 to increase friction when a user presses the pressing portion 181.

[0046] In addition, the side of the clipping portion 180 facing the trimming head is formed with an inclined surface 185. When the user inserts the docking portion 16 into the trimming head, the trimming head contacts the inclined surface 185 and gradually applies a thrust to the push button 18 along the inclined surface 185. Under the thrust of the trimming head, the push button 18 moves toward the interior of the support column 1. When the docking portion 16 is inserted into place, the trimming head and the inclined surface 185 are disengaged, and the push button 18 is reset under the action of the second elastic element 19. At this time, the clipping portion 180 is engaged with the trimming head. When the user needs to install the trimming head and the auxiliary wheel mechanism 4 together, they only need to align the mating position and then insert it, without having to repeatedly press the push button 18.

[0047] A curved surface 186 and a flat surface 187 are also formed on the clamping portion 180. The curved surface 186 is arranged between the inclined surface 185 and the flat surface 187, so that the process of the grass trimmer head and the inclined surface 185 being separated from each other during clamping is smoother, which can reduce damage to the clamping portion 180 and thus extend the service life of the push button 18.

[0048] In addition, the support column 1 also includes a height adjustment portion 168. One end of the support portion 166 is integrally formed with the docking portion 16, and the other end is integrally formed with the height adjustment portion 168. In this embodiment, the height adjustment portion 168 is set to a cylindrical shape to make its appearance more beautiful. A second accommodating cavity 12 is formed in the support column 1. More specifically, a second accommodating cavity 12 is formed in the height adjustment portion 168. The clamping member 10 is at least partially accommodated in the second accommodating cavity 12 and slides along the length direction of the support column 1. Specifically, the block 102 also includes a block body 106 and a connecting portion 111. The block body 106 and the toggle button 14 are connected through the connecting portion 111. An opening 112 for the connecting portion 111 to pass through is provided on the bottom wall of the sliding groove 15. The block body 106 is located on one side of the opening 112 and is accommodated in the support column 1. The toggle button 14 is located on the other side of the opening 112 and is exposed to the outside of the support column 1 for direct operation by the user.

[0049] like Figure 8 and Figure 9 As shown, the clamping member 10 includes a stopper 102 and a pair of baffles 100 symmetrically arranged on both sides of the stopper 102. An upshift hole 101 is provided on the baffle 100, and the other end of the axle 3 can be inserted into the upshift hole 101 and engaged with the baffle 100. An annular clamping groove 31 is provided on the end of the axle 3 away from the bottom wheel 2. When the axle 3 is inserted into the upshift hole 101, the baffle 100 is at least partially located in the clamping groove 31 to prevent the axle 3 from being separated from the upshift hole 101. A fixing opening 108 is formed on the baffle 100, and a second screw hole 109 is formed on the block body 106. A second screw 173 is passed through the fixing opening 108 and the second screw hole 109 to fix the baffle 100 to the stopper 102.

[0050] A plurality of first reinforcing ribs 13 are formed in the support column 1 , a first protrusion 107 is integrally formed on the stopper 102 , and one end of the first elastic element 11 abuts against the first reinforcing rib 13 , and the other end is sleeved on the first protrusion 107 and abuts against the stopper 102 .

[0051] The stopper 102 is integrally formed and includes a toggle button 14. A sliding groove 15 is formed on the support column 1. More specifically, the sliding groove 15 is formed on the outer surface of the height adjustment portion 168. The toggle button 14 is disposed on the outer side of the support frame 1 and is slidably disposed within the sliding groove 15. The user can slide the toggle button 14 along the length of the support column 1 to drive the clamping member 10 to slide.

[0052] An upshift hole 101 is formed on the baffle 100. The other end of the axle 3 can be inserted into the upshift hole 101 and engage with the baffle 100. Specifically, the axle 3 has an annular engaging groove 31 at the end away from the bottom wheel 2. When the axle 3 is inserted into the upshift hole 101, the baffle 100 abuts against the engaging groove 31. The upshift hole 101 is formed with an arc-shaped abutment portion 105. When the insertion portion 30 is fully inserted into the engaging member 10, the abutment portion 105 is accommodated in the engaging groove 31 and abuts against the bottom wall forming the engaging groove 31.

[0053] In addition, if Figure 10 and Figure 11 As shown, an insertion portion 30 is further formed on the end of the wheel axle 3 away from the bottom wheel 2, and the insertion portion 30 is conical; during the process of inserting the insertion portion 30 into the clamping member 10, the insertion portion 30 and the baffle 100 are relatively slidably connected, and the clamping member 10 moves under the push of the insertion portion 30 to overcome the elastic action of the first elastic element 11; when the insertion portion 30 is fully inserted into the clamping member 10, the conical surface of the insertion portion 30 is disengaged from the abutment with the baffle 100, and the baffle 100 is reset to a position at least partially accommodated in the slot 31 under the elastic action of the first elastic element 11.

[0054] The block 102 is slotted for weight reduction and has vertical second reinforcing ribs 103 for added strength. A first accommodating cavity 104 is formed within the block 102 at locations corresponding to the upshift holes 101. When the insert 30 is fully inserted into the connector 10, it is accommodated in the corresponding first accommodating cavity 104.

[0055] A first hole 110 is formed on the support column 1, corresponding to the upshift hole 101. The axle 3 passes through this first hole 110 and engages with the clamping member 10. It is worth noting that a first flat surface 34 is formed on the axle 3. The inner wall of the first hole 110 is provided with a second flat surface 35 that fits with the first flat surface 34 to constrain the axle 3. Furthermore, a second limiting groove 37 is formed on the axle 3. A limiting ring 36 is housed within this second limiting groove 37 to limit the horizontal displacement of the axle 3 when mounted on the base wheel 2.

[0056] The other end of the axle 3 is rotatably connected to the bottom wheel 2 through a bearing 32, so that the rotation of the bottom wheel 2 will not drive the axle 3 to rotate, making the connection between the axle 3 and the clamping part 10 more stable, so that the user will not have a sudden detachment of the bottom wheel 2 during use, causing a major impact.

[0057] Furthermore, the inner lining 201 of the bottom wheel 2 is integrally formed with the wheel hub 206, resulting in low cost, excellent durability, and easy replacement. Several anti-skid grooves 207 are evenly formed on the outer side of the wheel hub 206 of the bottom wheel 2, ensuring that the bottom wheel 2 maintains a good grip even when using the present invention on slippery lawns. Furthermore, the bottom wheel 2 includes a decorative cover 204 disposed outside the inner lining 201, which protects the connection between the axle 3 and the bottom wheel 2 and enhances its appearance.

[0058] When in use, first, the user inserts the docking portion 16 of the support column 1 into the corresponding position of the grass trimming head. During the insertion process, the grass trimming head abuts against the inclined surface 185 and gradually applies a thrust to the push button 18 along the inclined surface 185. The push button 18 moves toward the inside of the support column 1 under the thrust of the grass trimming head. When the docking portion 16 is inserted into place, the grass trimming head is disengaged from the inclined surface 185, and the push button 18 is reset under the action of the second elastic element 19. At this time, the clamping portion 180 is clamped with the grass trimming head; when the user needs to disassemble, press the pressing portion 181 of the push button 18, so that the clamping portion 180 moves into the support column 1 and disengages from the grass trimming head, and then removes the support column 1.

[0059] Secondly, when the user needs to adjust the height, first push the toggle button 14 upwards, thereby driving the block body 106 to overcome the movement of the first elastic element 11, and then driving the blocking piece 100 to move so that the blocking piece 100 is disengaged from the card slot 31 of the wheel shaft 3, so that the wheel shaft 3 is disengaged from the clamping piece 10, and then the user can take out the bottom wheels 2 on both sides together with the wheel shaft 3 from one height adjustment hole 101 respectively, and then insert the wheel shaft 3 into the other height adjustment hole 101. During the insertion process, since the insertion portion 30 is conical and fits the block hole 101, the user can move the blocking piece 100 so that the blocking piece 100 is disengaged from the card slot 31 of the wheel shaft 3. The plates 100 are relatively slidably connected, and the baffle 10 moves under the push of the insertion part 30, overcoming the elastic action of the first elastic element 11; when the insertion part 30 is fully inserted into the clamping part 10, the conical surface of the insertion part 30 is disengaged from the baffle 100, and the baffle 100 is reset to a position at least partially accommodated in the clamping groove 31 under the elastic action of the first elastic element 11. The clamping part 10 is reset under the elastic action of the first elastic element 11, and the wheel axle 3 is clamped with the clamping part 10 again, thereby completing a height adjustment process.

[0060] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An auxiliary wheel mechanism for a lawn mower, characterized in that: The grass trimmer comprises a grass trimming head, an auxiliary wheel mechanism (4) and a locking assembly (5); the grass trimming head and the auxiliary wheel mechanism (4) are detachably connected via the locking assembly (5); the auxiliary wheel mechanism (4) comprises a support column (1) detachably connected to the grass trimming head, and at least a portion of the support column (1) can be inserted into the grass trimming head; the locking assembly (5) comprises a push button (18) and a second elastic element (19); one end of the second elastic element (19) abuts against the locking assembly (5) and the other end abuts against the support column (1); the push button (18) is integrally formed and comprises a clamping portion (180) and a pressing portion (181); When the user presses the pressing portion (181), the engaging portion (180) moves into the support column (1) and disengages from the grass trimming head; When the user releases the pressing portion (181), the engaging portion (180) moves toward the outside of the support column (1) under the elastic force of the second elastic element (19) so as to be exposed outside the support column (1) and engage with the grass trimmer head.

2. The auxiliary wheel mechanism of the lawn mower according to claim 1, characterized in that: The support column (1) comprises a docking portion (16) that can be inserted into the interior of the grass trimmer head and a support portion (166) located outside the grass trimmer head; the clamping portion (180) is arranged on the docking portion (16); and the pressing portion (181) is arranged on the support portion (166).

3. The auxiliary wheel mechanism of the lawn mower according to claim 2, characterized in that: A third accommodating cavity (17) is formed in the support column (1), and the push button (18) is at least partially arranged in the third accommodating cavity (17), and the push button (18) can slide along the inner wall of the third accommodating cavity (17) in the length direction of the second elastic element (19), and the other end of the second elastic element (19) abuts against the bottom wall of the third accommodating cavity (17).

4. The auxiliary wheel mechanism of the lawn mower according to claim 3, characterized in that: The docking portion (16) is provided with a first opening (202) communicating with the third accommodating cavity (17), and the clamping portion (180) can pass through the first opening (202) and be exposed outside the support column (1).

5. The auxiliary wheel mechanism of the lawn mower according to claim 4, characterized in that: The support portion (166) is provided with a second opening (203) communicating with the third accommodating cavity (17), and the pressing portion (181) can pass through the second opening (203) and be exposed outside the support column (1).

6. The auxiliary wheel mechanism of the lawn mower according to claim 5, characterized in that: The push button (18) further includes a connecting portion (183), and the connecting portion (183) is arranged between the clamping portion (180) and the pressing portion (181).

7. The auxiliary wheel mechanism of the lawn mower according to claim 6, characterized in that: A limiting portion (161) is provided between the first opening (202) and the second opening (203), a first limiting groove (162) is formed between the clamping portion (180), the pressing portion (181) and the connecting portion (183), and the limiting portion (161) is accommodated in the first limiting groove (162).

8. The auxiliary wheel mechanism of the grass trimmer according to claim 7, characterized in that: The first side surface (167) and the second side surface (169) forming the first limiting groove (162) are clearance-matched with the limiting portion (161).

9. The auxiliary wheel mechanism of a lawn mower according to claim 2, characterized in that: The clamping portion (180) is formed with an inclined surface (185) on one side facing the grass trimming head. When the user inserts the docking portion (16) into the grass trimming head, the grass trimming head abuts against the inclined surface (185) and gradually applies a thrust along the inclined surface (185). The push button (18) moves toward the inside of the support column (1) under the thrust of the grass trimming head. When the docking portion (16) is plugged into place, the grass trimming head is disengaged from the abutment with the inclined surface (185). The push button (18) is reset under the action of the second elastic element (19). At this time, the clamping portion (180) is clamped with the grass trimming head.

10. The auxiliary wheel mechanism of the lawn mower according to claim 9, characterized in that: The clamping portion (180) is further formed with a curved surface (186) and a flat surface (187). The curved surface (186) is located between the inclined surface (185) and the flat surface (187), so that the process of the grass trimming head being separated from the inclined surface (185) during clamping is smoother. Furthermore, it is characterized in that the push button (18) is integrally formed and has a first groove (22) formed in the direction of the support column (1) to reduce weight. Furthermore, it is characterized in that a third reinforcing rib (182) is provided in the first groove (22) to increase the strength of the push button (18). Furthermore, it is characterized in that a second protrusion (184) is formed on the third reinforcing rib (182), and the second elastic element (19) is sleeved on the second protrusion (184).

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