Hand mower

Abstract

A hand mower, characterized in that it comprises a device body (10), a leveling element (20), a device body height adjustment element (60), a control plate (30), a front wheel assembly (40), a rear wheel assembly (50), and a cutting element (70). The rear wheel assembly (50) comprises a rotating shaft (51) and paired rear wheels (52). The two ends of the rotating shaft (51) are connected to the paired rear wheels (52). The rotating shaft (51) is mounted on the device body (10). The rotating shaft (51) is connected to the device body (10) by two mounting points. The straight line on which the connecting line of the two mounting points is located forms a first axis. The straight line on which the connecting line of the circle centers of the paired rear wheels (52) is located forms a second axis. The first axis is not coaxial with the second axis.wherein the device body height adjustment element (60) comprises at least two switching positions and the device body height adjustment element (60) drives the rear wheel (52) to rotate about the first axis as the circle center in order to realize a height adjustment, wherein the switching plate (30) serves to fold a handle of the device body (10) and to keep the device body (10) upright while the handle is in the retracted state, wherein the switching plate (30) comprises a main section (31) and a support section (32), wherein the main section (31) is connected to the device body (10), while the support section (32) is provided with the leveling element (20) for direct contact with the ground, wherein the rear wheel (52) runs tangentially to the ground while the device body (10) is in the upright state, wherein, when the device body height adjustment element (60) is in the lowest switching position,a tangent of the rear wheel (52) L1 located on a side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through a preset point W of the leveling element (20), wherein, when the device body height adjustment element (60) is in the highest switching position, a tangent of the rear wheel (52) L2 located on the side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through the preset point W of the leveling element (20), wherein the angle β between the tangent L1 and the tangent L2 is an acute angle.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Chinese patent application No. 202411944614.5, titled "Hand Mower," filed with the Chinese Patent Office on December 26, 2024. AREA OF THE UTILITY MODEL

[0002] The present utility model belongs to the technical field of lawn mowers and specifically concerns a hand mower. STATE OF THE ART

[0003] In the current state of the art, a lawn mower uses a control panel to fold the handle to accommodate the body in a minimal space, and the support structure of the control panel keeps the body upright. This reduces the footprint of the body, making it easier to store. This design allows the lawn mower to be more easily stored in environments with limited space, such as garages or tool rooms. However, the use of a body height adjustment element, or a means of adjusting the height of the body, allows users to flexibly adjust the height of the lawn mower to suit different lawn conditions and personal preferences. However, this also presents several potential problems: When the lawn mower's body height adjustment element is adjusted, the center of gravity of the entire machine may shift upward. This height change makes the lawn mower more likely to lose balance when stored vertically or near-vertically. Furthermore, the machine may be subjected to lateral forces or uneven external disturbances in its storage area, increasing the likelihood of the height-adjusted and upright stored machine body slipping and eventually tipping over. At the same time, the ground on which the machine body stands upright is often uneven due to varying ground conditions. The flatness of the contact point between the switch plate and the ground often varies, resulting in a smaller actual contact area. The contact points may not be completely solid, weakening the overall support capacity of the machine.When the machine body height adjustment element is adjusted, the center of gravity of the entire machine can shift upwards. This, in combination with irregularly distributed elevations or depressions on the ground surface, exacerbates this effect. In addition, the control plate can become asymmetries during production, assembly, or use of the lawn mower due to manufacturing or assembly errors, or vibration-related loosening caused by lack of maintenance. These errors can lead to a loss of balance when the control plate and rear wheel come into contact with the ground. This loss of balance manifests itself in wobbling of the machine body, which becomes even more noticeable when the height is adjusted due to the shift in the center of gravity. This instability increases the risk of tipping or overturning. In addition, this instability carries the possibility of scraping or abrading the ground.

[0004] For this reason, it is necessary to overcome the disadvantages of the state of the art by improving the existing technology accordingly. DISCLOSURE OF THE UTILITY MODEL

[0005] Therefore, the technical problem to be solved by the utility model is that the stability of the lawnmower is poor.

[0006] To solve the above technical problem, according to one aspect of the utility model, a hand mower is provided, comprising a device body, a leveling element, a device body height adjustment element, a switching plate, a front wheel assembly, a rear wheel assembly, and a cutting element. The rear wheel assembly comprises a rotating shaft and paired rear wheels. The two ends of the rotating shaft are connected to the paired rear wheels, and the rotating shaft is mounted on the device body. The rotating shaft is connected to the device body by two mounting points. The straight line connecting the two mounting points forms a first axis. The straight line connecting the circle centers of the paired rear wheels forms a second axis. The first axis is not coaxial with the second axis.wherein the device body height adjustment element comprises at least two switching positions and the device body height adjustment element drives the rear wheel to rotate about the first axis as the circle center to realize a height adjustment, wherein the switching plate serves to fold a handle of the device body and to keep the device body upright while the handle is in the retracted state, wherein the switching plate comprises a main section and a support section, wherein the main section is connected to the device body, while the support section is provided with the leveling element for direct contact with the ground, wherein the rear wheel runs tangentially to the ground while the device body is in the upright state, wherein, when the device body height adjustment element is in the lowest switching position,a tangent of the rear wheel L1 located on a side of the rear wheel facing away from the front wheel assembly and passing through a preset point W of the leveling element, while, when the implement body height adjustment element is in the highest switching position, a tangent of the rear wheel L2 located on the side of the rear wheel facing away from the front wheel assembly and passing through the preset point W of the leveling element, wherein the angle β between the tangent L1 and the tangent L2 is an acute angle. The arrangement of the axes of the rear wheel and the rotating shaft in a non-coaxial configuration enables the implement body height adjustment element to rotate the rear wheel for height adjustment. The angle β between the tangents L1 and L2 of the rear wheel,Located on the side of the rear wheel facing away from the front wheel assembly and passing through the predefined point W of the leveling element, it forms an acute angle in both the lowest and highest switching positions. This ensures that the device body, in the upright storage position, has a sufficiently wide and stable support surface in all switching positions to withstand minor vibrations or external impacts. At the same time, the change in the angle between the rear wheel and the support section is kept within a small angular range at different switching positions. Optimizing the support structure and geometric parameters improves mechanical performance, better solving the problem of center of gravity fluctuations due to structural changes during the mechanical movement process. This ensures that the device can reliably withstand complex external factors, even when exposed toThe overall tipping stability is improved, allowing the machine to be stored upright more safely and stably. Furthermore, the installation of a leveling element on the support section ensures that it can adapt to different terrain and provide optimal support for the machine body. Combined with the coordinated action of the rear wheel position, the stability of the machine body is ensured in all gear positions. At the same time, friction-induced ground wear is effectively reduced, an additional damping effect is achieved, and the pressure on the support section is distributed, further increasing the stability of the machine body and eliminating the risk of the machine body wobbling or tipping over in an upright position.

[0007] Optionally, it is provided that in at least one of the switching positions at least part of the leveling element comes into contact with the ground, wherein the hardness of the leveling element is less than the hardness of the support section. The adjustment described above allows the leveling element to be better adapted to slightly uneven surfaces, thereby improving the adaptability of the device to uneven ground in the overall installation. At the same time, loss of balance that could arise from contact of the switch plate and the rear wheel with the ground is avoided. The leveling element is also able to absorb part of the forces when lateral forces or uneven external disturbances occur. This further reduces the loss of balance when the switch plate and the rear wheel come into contact with the ground and prevents the switch plate from scraping or damaging the ground when wobbling.

[0008] Optionally, in the upright position, the contact point of the leveling element with the ground and the contact point of the rear wheel with the ground form a straight line L, whereby the distance between the intersection point of the vertical line on which the center of gravity of the device body lies with the straight line L and the center of the straight line L is less than or equal to ±150 mm. The adjustment described above ensures that the device body maintains a stable position in all switching positions. This eliminates potential risks of the device body wobbling or tipping in the upright position and ensures that the device body maintains high stability in all switching positions.

[0009] Optionally, the included angle β can be less than or equal to 15°. The adjustment described above ensures that the device body exhibits the smallest possible angular offset in all switching positions. This prevents the center of gravity of the device body from excessively angular deviation and ensures that the device body maintains high stability in all switching positions.

[0010] Optionally, it is provided that the size of the rear wheel is equal to the size of the front wheel of the front wheel assembly, wherein the angle of rotation θ of the rear wheel is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than or equal to the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element; or wherein the size of the rear wheel is greater than or equal to the size of the front wheel of the front wheel assembly and the angle of rotation θ of the rear wheel is 90°<θ<270°, wherein the distance between the second axis and the first axis is greater than the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element; wherein the lowest cutting plane is the cutting plane when cutting by the cutting element in the lowest switching position.The above-described adjustment ensures that when the device body is supported in an upright position by the shift plate and rear wheel, the angle change between the rear wheel and the support section is kept within a small range at different shift positions. This reduces the angle of the center of gravity shift to the rear, and when the device body is laid flat, the angle between the shift plate and the ground is also smaller. This makes the device body more compact, reduces the packaging height of the product, and lowers production costs.

[0011] Optionally, the radius size of the rear wheel is 20 mm larger than the distance between the second axle and the first axle.

[0012] Optionally, the support section can be arranged at an angle to the main section. The adjustment described above places the support section and the main section in an L-shaped bend. This creates a large surface area on the side of the leveling element attached to the support section facing the ground, ensuring a larger contact area and increasing the stability of the contact with the ground.

[0013] Optionally, the support section and the main section can be arranged in the same plane or in parallel planes. The arrangement described above allows the contact area between the circuit board and the floor to be reduced, which also keeps the contact area of the leveling element with the floor relatively small. This minimizes wear on the floor as much as possible.

[0014] Optionally, a mounting hole is provided in the main section or the support section, and the mounting hole can be a closed hole or an open hole. Providing the mounting hole ensures a stable and secure connection between the leveling element and the circuit board.

[0015] Optionally, it is provided that in the case where the mounting opening is located in the main section, or the mounting opening is located in the support section and the support section and the main section are arranged in the same plane or in parallel planes, the minimum distance h between the side of the mounting opening facing the ground in the upright position and the outermost edge of the support section facing the ground is more than 2 mm if the mounting opening is a closed opening. The adjustment described above ensures that the mounting opening not only prevents local stress concentrations that could arise from insufficiently designed designs during installation or use, but also avoids compromising the overall strength of the support section. This ensures the long-term durability and stability of the support section.

[0016] Optionally, the support section is arranged at an angle to the main section and the mounting opening is arranged on the support section. If the mounting opening is a closed opening, the minimum distance h between the peripheral edge of the mounting opening and the outer peripheral edge of the support section is greater than 2 mm. The adjustment described above ensures that the mounting opening not only prevents local stress concentrations that could arise from insufficiently designed designs during assembly or use, but also avoids compromising the overall strength of the support section. This ensures the long-term durability and stability of the support section.

[0017] Optionally, the circuit board further includes a fastening element, and the leveling element is connected and fixed to the support section via the mounting hole and the fastening element. By providing the fastening element, the leveling element is securely fixed to the support section, thereby preventing detachment of the leveling element as much as possible and reducing unnecessary repairs or replacements.

[0018] Optionally, the main section or the support section is provided with a positioning element, wherein the leveling element is provided with a counter element, wherein the counter element and the positioning element lock together so that the leveling element is pushed onto the support section. Through the adjustment described above, the leveling element can be connected and fixed to the support section by a locking connection, thereby increasing the connection stability.

[0019] Optionally, the leveling element may have a groove, wherein the minimum distance between any opposing surfaces in the leveling element is smaller than the thickness of the support section, so that the leveling element is slid onto the support section; or wherein the inner wall of the groove is provided with a clamping element, and the minimum distance between any opposing surfaces of the leveling element is smaller than the thickness of the support section, so that the leveling element is slid onto the support section. Through the adjustment described above, the leveling element is designed as a U-shaped structure with both sides bent inward. This allows it to be firmly clamped to the support section after being slid onto it, without the need for additional fastening structures, which is simple and practical.By providing the clamping element, the connection strength between the leveling element and the support section can be further increased.

[0020] Optionally, a first end of the leveling element is slid onto the support section, and a second end of the leveling element extends from the support section to the main section. The circuit board further comprises a fastening element, and one or two ends of the leveling element are connected and fixed to the circuit board via the mounting opening and the fastening element. The adjustment described above ensures that the end of the leveling element is firmly connected and fixed to the circuit board, thereby ensuring connection stability.

[0021] Optionally, the fastening element comprises a screw, wherein the leveling element is provided with a mounting hole corresponding to the mounting opening, and wherein the screw passes through the mounting opening and protrudes into the mounting hole to be connected and fixed to the leveling element. The screw enables a stable connection to the leveling element, thereby further increasing the connection strength between the leveling element and the circuit board.

[0022] Optionally, a protrusion portion is provided on the leveling element, wherein one end of the protrusion portion is a locking end, and the protrusion portion extends through the mounting opening and engages with the support portion. Through the adjustment described above, the locking end of the protrusion portion can pass through the mounting opening and engage with the inner surface of the support portion. This ensures a stable connection between the leveling element and the support portion.

[0023] Optionally, the two ends of the leveling element are each provided with a first locking portion and a second locking portion, respectively, and at least one of the first locking portion and the second locking portion is locked to the mounting hole. The above-described adjustment ensures that both ends of the leveling element can be locked to the circuit board, thereby ensuring the stability of the connection between the leveling element and the circuit board.

[0024] Optionally, the leveling element may have a groove so that the leveling element is pushed onto the support section, wherein the two ends of the leveling element are each provided with a through-hole corresponding to the mounting opening. The circuit board further comprises a fastening element, and the fastening element passes through the two through-holes and the mounting opening, so that the leveling element and the support section are connected and fastened to each other. The connection of the fastening element to the through-hole and the mounting opening ensures the stability of the connection between the leveling element and the support section.

[0025] Optionally, both ends of the leveling element are provided with a buckle structure, which snaps together with the edge of the support section and is fixed. The adjustment described above ensures that both ends of the leveling element can be connected to the support section in a snap-locking and position-limited manner, thus ensuring the stability of the connection between the leveling element and the support section.

[0026] Optionally, the leveling element comprises a receiving groove and a through-hole, the through-hole communicating with the receiving groove, one end of the support portion being snugly received in the receiving groove, and a mounting opening formed in the support portion. The circuit board further comprises a fastening element, the fastening element passing through the through-hole and the mounting opening and being connected and fixed to the support portion. The connection of the fastening element to the through-hole and the mounting opening ensures the stability of the connection between the leveling element and the support portion.

[0027] Optionally, it is provided that the support section has a receiving groove and the mounting opening and the mounting opening communicates with the receiving groove, wherein the opening of the receiving groove faces away from the device body, wherein the leveling element is received in the receiving groove, wherein the circuit board further has a fastening element and fastening element passes through the mounting opening and is connected and fixed to the leveling element.

[0028] Optionally, the circuit board can be made of a hard material.

[0029] Optionally, the circuit board can be made of a metal material.

[0030] Optionally, the leveling element can be made of a soft material.

[0031] Optionally, the soft material can be at least one of the following materials: plastic, silicone, rubber, Teflon, polyurethane foam, polyurethane elastomer, or soft polyurethane. The above-mentioned material ensures that the leveling element is not only flexible but also wear-resistant, ensuring a long service life.

[0032] Optionally, the leveling element can be a solid structure; or the leveling element can be a hollow structure; or the leveling element has a cavity in which multiple support columns are arranged at intervals. The solid structure ensures sufficient and stable contact between the leveling element and the ground. The hollow structure can additionally exert a damping effect, making the contact between the leveling element and the ground more flexible and at the same time reducing the manufacturing cost of the leveling element. The support column in the cavity not only acts as a damping element but also more efficiently transfers the weight of the device body to the ground. This ensures that the device body remains fully in contact with the ground and is stably held in an upright position.

[0033] Optionally, the support section can be detachably connected to the main section; or the support section and main section can be formed integrally. The one-piece design ensures that the circuit board has sufficient structural strength, which increases its service life. By using a detachable connection structure, only the corresponding support section or main section can be replaced when necessary, such as during repairs or when replacing the circuit board, without having to replace the entire circuit board. This simplifies the work of maintenance personnel and reduces maintenance costs.

[0034] Optionally, the leveling element can be bonded to the support section. This design allows the leveling element to be directly connected and fixed to the support section without the need for additional structural components, making installation quick and easy.

[0035] Optionally, the support section can have at least one of the following shapes: I-shape, J-shape, L-shape, T-shape, C-shape, U-shape, or a combination thereof. The adjustment described above allows the support section to be adapted to various connection methods.

[0036] Optionally, the side of the leveling element facing the ground can be a flat surface, an arcuate surface, a trapezoidal surface, or a sharp-edged structure. The adjustment described above allows the leveling element to be adapted to the various switching positions of the device body height adjustment element.

[0037] Optionally, in the upright position, the angle α between the device body and the vertical direction is 0° to 20°.

[0038] Optionally, the leveling element can be in line contact with the ground in any of the switch positions when the device body is in the upright position. The adjustment described above allows the contact area between the leveling element and the ground to be reduced to minimize scraping or wear on the ground.

[0039] Optionally, when the device body is in an upright position, the leveling element is in surface contact with the ground in each of the switching positions. The adjustment described above ensures that the leveling element has a certain contact area with the ground in each switching position, ensuring the stability of the ground contact.

[0040] Optionally, the contact position between the leveling element and the ground can be adjusted with the switch position under the influence of the device body height adjustment element. The adjustment described above allows the leveling element to provide optimal support for the device body in every switch position. Combined with the coordinated effect of the rear wheel position, the stability of the device body is ensured in all switch positions.

[0041] Optionally, the support section is rotatably connected to the main section, and the leveling element is positioned on a side of the support section facing away from the main section. The rotatable arrangement of the support section allows the leveling element located thereon to maintain constant surface contact with the ground, following the force of gravity. This increases the contact area between the leveling element and the ground, improving the stability of the ground contact.

[0042] According to another aspect of the utility model, a hand mower is provided, comprising a device body, a device body height adjustment element, a switch plate, a front wheel assembly, a rear wheel assembly, and a cutting element, wherein the rear wheel assembly comprises a rotating shaft and paired rear wheels, wherein the two ends of the rotating shaft are connected to the paired rear wheels, and the rotating shaft is mounted on the device body. The rotating shaft is connected to the device body by two mounting points, wherein the straight line on which the connecting line of the two mounting points is located forms a first axis, wherein the straight line on which the connecting line of the circle centers of the paired rear wheels is located forms a second axis, wherein the first axis is not coaxial with the second axis.wherein the device body height adjustment element comprises at least two switching positions and the device body height adjustment element drives the rear wheel to rotate about the first axis as the circle center to realize a height adjustment, wherein the switching plate serves to fold a handle of the device body and to keep the device body upright while the handle is in the retracted state, wherein the switching plate comprises a main section and a support section, wherein the main section is connected to the device body, while the support section is used for direct contact with the ground, wherein the rear wheel is tangential to the ground while the device body is in the upright state, wherein, when the device body height adjustment element is in the lowest switching position,a tangent of the rear wheel L1 located on a side of the rear wheel facing away from the front wheel assembly and passing through a preset point W of the support section, while, when the device body height adjustment element is in the highest switching position, a tangent of the rear wheel L2 located on the side of the rear wheel facing away from the front wheel assembly and passing through the preset point W of the support section, wherein the angle β between the tangent L1 and the tangent L2 is an acute angle.

[0043] Optionally, in the upright position, the contact point of the support section with the ground and the contact point of the rear wheel with the ground form a straight line L, with the distance between the intersection point of the vertical line on which the center of gravity of the device body lies and the straight line L and the midpoint of the straight line L being less than or equal to ±150 mm. The adjustment described above ensures that the device body maintains a stable position in all switching positions. This eliminates potential risks of the device body wobbling or tipping in the upright position and ensures that the device body maintains high stability in all switching positions.

[0044] The included angle β is less than or equal to 15°. The adjustment described above ensures that the device body exhibits the smallest possible angular offset in all switching positions. This prevents the center of gravity of the device body from excessive angular deviation and ensures that the device body maintains high stability in all switching positions.

[0045] Optionally, it is provided that the size of the rear wheel is equal to the size of the front wheel of the front wheel assembly, wherein the angle of rotation θ of the rear wheel is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than or equal to the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element; or wherein the size of the rear wheel is greater than or equal to the size of the front wheel of the front wheel assembly and the angle of rotation θ of the rear wheel is 90°<θ<270°, wherein the distance between the second axis and the first axis is greater than the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element; wherein the lowest cutting plane is the cutting plane when cutting by the cutting element in the lowest switching position.The above-described adjustment ensures that when the device body is supported in an upright position by the shift plate and rear wheel, the angle change between the rear wheel and the support section is kept within a small range at different shift positions. This reduces the angle of the center of gravity shift to the rear, and when the device body is laid flat, the angle between the shift plate and the ground is also smaller. This makes the device body more compact, reduces the packaging height of the product, and lowers production costs.

[0046] Optionally, the radius size of the rear wheel is 20 mm larger than the distance between the second axle and the first axle.

[0047] The technical solution of the embodiments of the present utility model is characterized by at least the following advantages: The hand mower according to the utility model comprises a device body, a leveling element, a device body height adjustment element, a control plate, a front wheel assembly, a rear wheel assembly, and a cutting element, wherein the rear wheel assembly comprises a rotating shaft and paired rear wheels, wherein the two ends of the rotating shaft are connected to the paired rear wheels, and the rotating shaft is mounted on the device body. The rotating shaft is connected to the device body by two mounting points, wherein the straight line on which the connecting line of the two mounting points is located forms a first axis, wherein the straight line on which the connecting line of the circle centers of the paired rear wheels is located forms a second axis, wherein the first axis is not coaxial with the second axis.wherein the device body height adjustment element comprises at least two switching positions and drives the rear wheel to rotate about the first axis as the circle center to realize a height adjustment, wherein the switching plate serves to fold a handle of the device body and to keep the device body upright while the handle is in the retracted state, wherein the switching plate comprises a main section and a support section, wherein the main section is connected to the device body, while the support section is provided with the leveling element for direct contact with the ground, wherein the rear wheel runs tangentially to the ground while the device body is in the upright state, wherein, when the device body height adjustment element is in the lowest switching position,a tangent of the rear wheel L1 located on a side of the rear wheel facing away from the front wheel assembly and passing through a preset point W of the leveling element, while, when the implement body height adjustment element is in the highest switching position, a tangent of the rear wheel L2 located on the side of the rear wheel facing away from the front wheel assembly and passing through the preset point W of the leveling element, wherein the angle β between the tangent L1 and the tangent L2 is an acute angle. The arrangement of the axes of the rear wheel and the rotating shaft in a non-coaxial configuration enables the implement body height adjustment element to rotate the rear wheel for height adjustment. The angle β between the tangents L1 and L2 of the rear wheel,Located on the side of the rear wheel facing away from the front wheel assembly and passing through the predefined point W of the leveling element, it forms an acute angle in both the lowest and highest switching positions. This ensures that the device body, in the upright storage position, has a sufficiently wide and stable support surface in all switching positions to withstand minor vibrations or external impacts. At the same time, the change in the angle between the rear wheel and the support section is kept within a small angular range at different switching positions. Optimizing the support structure and geometric parameters improves mechanical performance, better solving the problem of center of gravity fluctuations due to structural changes during the mechanical movement process. This ensures that the device can reliably withstand complex external factors, even when exposed toThe overall tipping stability is improved, allowing the machine to be stored upright more safely and stably. Furthermore, the attachment of a leveling element to the support section ensures that it can adapt to different terrain and provide optimal support for the machine body. Combined with the coordinated action of the rear wheel position, the stability of the machine body is ensured in all gear positions. At the same time, friction-induced ground wear is effectively reduced, an additional damping effect is achieved, and pressure is distributed across the support section, further increasing the stability of the machine body and eliminating the risk of the machine body wobbling or tipping over in an upright position. This solves the problem of poor stability of state-of-the-art lawn mowers. Representation of the utility model

[0048] To better explain the specific embodiments of the present utility model or the embodiments in the prior art, the accompanying drawings used to describe the specific embodiments or the prior art are briefly described below. It is understood that the following drawings illustrate some embodiments of the utility model, and that it is possible for those of ordinary skill in the art to obtain further drawings based on such drawings without inventive activity. Fig. 1 shows a schematic representation of the top view perspective of a hand mower according to a concrete embodiment of the utility model; Fig. 2 shows a schematic representation of the hand mower in an upright state in a switching position according to a concrete embodiment of the utility model; Fig. 3 shows an enlarged detailed view of the leveling element from Fig. 2; Fig. 4 shows a schematic representation of the hand mower in an upright state in another switching position according to a concrete embodiment of the utility model; Fig. 5 shows a schematic representation of the connection between the device body and the rear wheel assembly according to a specific embodiment of the utility model; Fig. 6 shows a schematic representation of several switching positions of the hand mower according to a concrete embodiment of the utility model; Fig. 7 shows a schematic representation of the first switching position of the hand mower according to a concrete embodiment of the utility model; Fig. 8 shows a schematic representation of the second switching position of the hand mower according to a concrete embodiment of the utility model; Fig. 9 shows a schematic representation of the third switching position of the hand mower according to a concrete embodiment of the utility model; Fig. 10 shows an enlarged detailed view of the support section according to a concrete embodiment of the utility model; Fig. 11 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 12 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 13 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 14 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 15 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 16 shows an enlarged detailed view of the support section according to another concrete embodiment of the utility model; Fig. 17 shows a schematic representation of the mounting opening according to a concrete embodiment of the utility model. Description of reference symbols:

[0049] 10 - tool body; 20 - leveling element; 201 - first end; 202 - second end; 21 - groove; 22 - through hole; 23 - projection portion; 24 - locking block; 25 - clamping element; 30 - switching plate; 31 - main portion; 32 - support portion; 33 - mounting hole; 40 - front wheel assembly; 50 - rear wheel assembly; 51 - rotating shaft; 52 - rear wheel; 60 - tool body height adjusting element, 70 - cutting element. CONCRETE EMBODIMENTS

[0050] The technical solution of the present utility model is explained below in full and detail with reference to the accompanying drawings. It is understood that the described embodiments represent a portion of the embodiments of the present utility model, rather than all of them. The present utility model is explained in more detail below with reference to the accompanying drawings using exemplary embodiments. It should be noted that the features in the exemplary embodiments of the present utility model can be combined with one another, provided there is no conflict.

[0051] It should be noted that the terms “first”, “second”, etc. in the description, claims and above drawings of the present utility model are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

[0052] In the present utility model, unless otherwise stated, orientation terms such as "top, bottom, uppermost, lowermost" are commonly used with reference to the direction shown in the drawing or the respective component itself in the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "inside, outside" refers to the inside and outside with respect to the contours of the respective component itself, but the above orientation terms are not used to limit the present utility model.

[0053] The utility model solves the problem of poor stability of lawn mowers in the state of the art.

[0054] As in the Fig. 1 to 4 and 6 to 9, the hand mower includes a body 10, a leveling element 20, a body height adjustment element 60, a control plate 30, a front wheel assembly 40, a rear wheel assembly 50, and a cutting element 70. The front wheel assembly 40 is located on the front side of the body 10, and the rear wheel assembly 50 is located on the rear side. It will be appreciated that the rear side of the body 10 is the operating side, to which a handle (not shown) is attached for the user to hold and operate the hand mower. The control plate 30 is attached to the rear side of the body 10 and serves to fold the handle of the body 10 and to hold the body 10 in an upright position when the handle is folded. When the device body 10 is in an upright position, the rear wheel 52 and the switch plate 30 touch the ground to ensure stability.

[0055] As in Fig. 5, the rear wheel assembly 50 includes a rotating shaft 51 and paired rear wheels 52. The two ends of the rotating shaft 51 are respectively connected to the paired rear wheels 52, and the rotating shaft 51 is mounted on the device body 10. The rotating shaft 51 is connected to the device body 10 via two mounting points, with the connecting line between these two mounting points forming the first axis. The connecting line between the centers of the paired rear wheels 52 forms the second axis, with the first axis not being coaxial with the second axis. Specifically, the rotating shaft 51 is U-shaped with lateral extensions. The central portion of the rotating shaft 51 is mounted on the device body 10 and forms the first axis of rotation. The lateral portions of the rotating shaft 51 are first bent inward and then outward and are respectively connected to the rear wheels 52.The lateral sections of the rotating shaft 51 are arranged coaxially and thus form the second axis of rotation, whereby the rear wheels 52 can rotate around the first axis as the center.

[0056] As in Fig. As shown in Figures 10 to 16, the switching plate 30 includes a main section 31 and a support section 32. The main section 31 is connected to the device body 10, and the support section 32 is equipped with the leveling element 20 that is in direct contact with the ground. Specifically, the main section 31 extends rearward from the rear wheel assembly 50, and the support section 32 is located at the end of this extension. Thus, the switching plate 30 and the rear wheel assembly 50 form a triangular / square structure with two support points, ensuring the stability of the device body 10 in an upright position.

[0057] In this embodiment, as in Fig. 2, Fig. As shown in Figures 4 and 5 to 9, the device body height adjustment element 60 comprises at least two switching positions that give the lawn mower the ability to adapt to different terrain and lawn conditions by varying the cutting height. In different switching positions, the height of the plane of the device body 10 above the ground differs, thereby meeting different cutting height requirements. The device body height adjustment element 60 drives the rear wheel 52 to rotate about the first axis as the center point to realize the height adjustment. When the device body 10 is in an upright position, the rear wheel 52 touches the ground tangentially, and under the action of the device body height adjustment element 60, the contact position between the leveling element 20 and the ground changes depending on the switching position. In at least one switching position, at least a portion of the leveling element 20 is in contact with the ground. Specifically, Fig. 2 a switching position in which the leveling element 20 is in contact with the ground, while Fig. 4 shows a switching position in which the leveling element 20 is in linear contact with the ground. It is understood that the leveling element 20 has a plate- or block-shaped structure, and the posture of the device body 10 varies in different switching positions, changing the angle between the leveling element 20 and the ground and thus varying the contact with the ground.

[0058] Show concretely Fig. 2 and Fig. 4, that in the upright position, the angle α between the device body 10 and the vertical direction is between 0° and 20°. This means that the posture of the device body 10 in various switching positions ranges from vertical to 20° tilted backward.

[0059] Using the example of Fig. 2, the angle α between the device body 10 and the vertical direction is 0°, i.e., in this case, the device body 10 is at a right angle to the ground. The side of the control plate 30 facing the ground runs parallel to the ground, so that the underside of the leveling element 20 attached to the control plate 30 is in flat contact with the ground. This type of contact provides maximum stability when stationary, distributes the weight of the device body 10 evenly, and reduces local wear and pressure concentration. If the angle between the device body 10 and the ground is not 90°, the side of the control plate 30 facing the ground is not parallel to the ground, so that the edge of the underside of the leveling element 20 on the control plate 30 is in linear contact with the ground. By adjusting the height of the device body height adjustment element 60, the distance of the device body 10 parallel to the ground increases.With the rear wheel assembly 50 as the pivot point, the leveling element 20 can provide optimal stability in various usage scenarios. Of course, the leveling element 20 can also be in full contact with the ground at other angles between the device body 10 and the ground, i.e., in other switching positions of the device body height adjustment element 60, and is not limited to 90°. This can be selected according to actual needs.

[0060] Furthermore, it is provided that, when the device body 10 is in the upright state, the leveling element 20 is in surface contact with the ground in each of the switching positions. Specifically, the support section 32 is not a flat plate structure, but a curved structure, for example, arcuate or polygonal. Accordingly, the leveling element 20 is also designed in an arcuate or polygonal shape. As a result, the leveling element 20 is in contact with the ground over a certain area in each switching position, which ensures the stability of the ground contact. Of course, by adjusting the angle of the arcuate or polygonal structure of the support section 32, the leveling element 20 can be in linear contact with the ground in each switching position, thereby reducing the contact area with the ground to prevent scraping or wearing of the ground as much as possible. This can be selected according to actual needs.

[0061] In this embodiment, as in Fig. As shown in Figures 6 to 9, the tangent of the rear wheel 52, which is located on the side of the rear wheel 52 facing away from the front wheel assembly 40 and passes through the preset point W of the leveling element 20, is L1 when the implement body height adjustment element 60 is in the lowest switching position. When the implement body height adjustment element 60 is in the highest switching position, the tangent of the rear wheel 52, which is located on the side of the rear wheel 52 facing away from the front wheel assembly 40 and passes through the preset point W of the leveling element 20, is L2. The angle β between the tangent L1 and the tangent L2 is an acute angle. The arrangement of the axes of the rear wheel 52 and the rotating shaft 51 in a non-coaxial configuration in the technical solution of the application enables the device body height adjustment element 60 to rotate the rear wheel 52 for height adjustment.The angle β between the tangents L1 and L2 of the rear wheel 52, which lie on the side of the rear wheel 52 facing away from the front wheel assembly 40 and pass through the predefined point W of the leveling element 20, is an acute angle in both the lowest and highest switching positions. This ensures that the device body 10, in the upright storage position, has a sufficiently wide and stable support surface in all switching positions to withstand minor vibrations or external impacts. At the same time, the change in the angle between the rear wheel 52 and the support section 32 is kept within a small angular range at different switching positions. By optimizing the support structure and the geometric parameters, the mechanical performance is improved, thereby better solving the problem of center of gravity fluctuations due to structural changes during the mechanical movement process.This ensures that the device can reliably withstand complex external factors, improves overall tipping stability, and allows the machine to be stored upright more safely and stably.

[0062] It will be appreciated that the tangents L1 and L2 are located on the side of the rear wheel 52 remote from the front wheel assembly 40, that is, the side closer to the leveling element 20 or in contact with the ground in the upright position.

[0063] Note that the preset point W of the leveling element 20 can be the center of gravity of the leveling element 20, a point on the ground-facing plane of the leveling element 20, or any point on the leveling element 20. The purpose of this point is to serve as a reference point to illustrate the angular relationship between the tangents L1 and L2. Therefore, the exact position does not need to be specified.

[0064] Specifically, in this exemplary embodiment, the angle β is less than or equal to 15°. The parameter range described above ensures that the device body 10 exhibits the smallest possible angular offset in all switching positions. This prevents the center of gravity of the device body 10 from exhibiting excessive angular deviation and ensures that the device body 10 maintains high stability in all switching positions.

[0065] Furthermore, in the present embodiment it is provided that in the upright state, as in Fig. 6, the contact point of the leveling element 20 with the ground and the contact point of the rear wheel 52 with the ground form a straight line L, wherein the distance between the intersection point of the vertical line on which the center of gravity of the device body 10 lies with the straight line L and the midpoint of the straight line L is less than or equal to ±150 mm. The adjustment described above ensures that the device body 10 maintains a stable stand in all switching positions. This eliminates potential risks of the device body 10 wobbling or tipping in the upright state and ensures that the device body 10 has a high level of stability in all switching positions. It is understandable that the sign of the distance between the intersection point of the vertical line of the center of gravity of the device body 10 and the straight line L and the midpoint of the straight line L indicates on which side of the midpoint of the straight line L the intersection point lies.For example, in . Fig. 6 The intersection point of the vertical line of the center of gravity of the device body 10 and the straight line L is to the left of the center of the straight line L, which corresponds to a negative sign, and to the right of the center of the straight line L, which corresponds to a positive sign. If the intersection point of the vertical line of the center of gravity of the device body 10 and the straight line L coincides with the center of the straight line L, the value is 0.

[0066] In this embodiment, as in Fig. As shown in Figures 7 to 9, the rotation angle θ of the rear wheel 52 is 90° to 270°. It should be understood that the rotation angle θ of the rear wheel 52 is the angle by which the rear wheel 52 rotates clockwise, with the horizontal line extending from the first axis to the left toward the front wheel assembly 40 serving as the 0° reference. This adjustment provides the device body height adjustment element 60 with a wider adjustment range to adapt to various application scenarios and terrain conditions.

[0067] In this embodiment, when the size of the rear wheel 52 corresponds to the size of the front wheel of the front wheel assembly 40, the rotation angle θ of the rear wheel 52 satisfies the condition: 90° ≤ θ ≤ 270°. The distance between the second axis and the first axis is greater than or equal to the vertical distance between the highest and lowest switching positions of the implement body height adjustment element 60 in the lowest cutting plane of the hand mower. When the size of the rear wheel 52 is greater than or equal to the size of the front wheel of the front wheel assembly 40, the rotation angle θ of the rear wheel 52 satisfies the condition: 90° < θ < 270°. The distance between the second axis and the first axis is greater than the vertical distance between the highest and lowest switching positions of the implement body height adjustment element 60 in the lowest cutting plane of the hand mower.The lowest cutting plane is the cutting plane when cutting by the cutting element 70 in the lowest switching position. It is understandable that if the size of the rear wheel 52 corresponds to the size of the front wheel of the front wheel assembly 40 and the distance between the second axis and the first axis is greater than or equal to the vertical distance between the highest and lowest switching positions of the implement body height adjustment element 60 in the lowest cutting plane of the hand mower, the lowest cutting plane is in the switching position with the closest distance to the ground when the rotation angle θ of the rear wheel 52 is 90°. This corresponds to the lowest switching position of the implement body height adjustment element 60, as shown in FIG. Fig. 7. When the rotation angle θ of the rear wheel 52 is 270°, the lowest cutting plane is in the switching position with the greatest distance to the ground, which corresponds to the highest switching position of the device body height adjustment element 60, as shown in Fig. 9 shown.

[0068] When the size of the rear wheel 52 is larger than that of the front wheel of the front wheel assembly 40, or when the size of the rear wheel 52 corresponds to that of the front wheel of the front wheel assembly 40, and the distance between the second axle and the first axle is greater than the vertical distance between the highest and lowest switching positions of the implement body height adjustment element 60 in the lowest cutting plane of the hand mower, the lowest cutting plane is in the switching position with the shortest distance from the ground when the rotation angle θ of the rear wheel 52 is close to 90°. This corresponds to the lowest switching position of the implement body height adjustment element 60. When the rotation angle θ of the rear wheel 52 is close to 270°, the lowest cutting plane is in the switching position with the greatest distance from the ground, which corresponds to the highest switching position of the implement body height adjustment element 60.

[0069] The above-described adjustment ensures that when the device body 10 is supported in the upright state by the shift plate 30 and the rear wheel 52, the change in the angle between the rear wheel 52 and the support portion 32 is kept within a small angular range at different shift positions. As a result, the angle of the center of gravity shift to the rear is smaller, and when the device body 10 is laid flat, the angle between the shift plate 30 and the ground is also smaller. This makes the device body 10 more compact, reduces the packaging height of the product, and lowers production costs. Furthermore, in the present embodiment, the radius size of the rear wheel 52 is provided to be 20 mm larger than the distance between the second axis and the first axis. In other words, the distance between the first axis and the outer edge of the rear wheel 52 is 20 mm.

[0070] In this embodiment, the hardness of the leveling element 20 is lower than that of the support section 32. This means that the leveling element 20 is made of a flexible material. By using the leveling element 20 and selecting a flexible material, the leveling element 20 can adapt to various terrain features and provide optimal support for the device body 10. In combination with the coordinated action of the position of the rear wheel assembly 50, the stability of the device body 10 is ensured in all switching positions. At the same time, ground wear caused by friction is effectively reduced, and an additional damping effect is achieved, distributing the pressure on the support section 32 and further increasing the stability of the device body 10. This eliminates any risk of the device body 10 wobbling or tipping during storage.Furthermore, the leveling element 20 can better adapt to slightly uneven surfaces, thereby improving the device's adaptability to uneven ground during the overall installation. It prevents loss of balance when the switch plate 30 and the rear wheel 52 come into contact with the ground. Furthermore, the leveling element 20 can absorb some of the forces when lateral forces or uneven external disturbances occur, further reducing the loss of balance when the switch plate 30 and the rear wheel 52 come into contact with the ground. This also prevents the switch plate 30 from scraping or damaging the ground when it wobbles.

[0071] In this embodiment, the circuit board 30 is made of a hard material. Furthermore, the circuit board 30 is made of metal. For example, the circuit board 30 can be made of iron sheet, alloy sheet, or stainless steel sheet.

[0072] In this embodiment, the leveling element 20 is made of a soft material. Since friction occurs between the leveling element 20 and the floor, the leveling element 20 must be both flexible and wear-resistant to ensure a long service life. Specifically, the soft material is at least one of the following materials: plastic, silicone, rubber, Teflon, polyurethane foam, polyurethane elastomer, or soft polyurethane.

[0073] In this embodiment, the switching plate 30 is provided either in single or double configuration. The switching plate 30 is located at one or both ends of the rear side of the device body 10, allowing the device body 10 to be held stably in an upright position. Accordingly, two leveling elements 20 are also provided.

[0074] In this embodiment, the leveling element 20 is a solid structure to ensure sufficient and stable contact with the ground. Of course, the leveling element 20 can also have a hollow structure. This means that the leveling element 20 has a cavity filled with air. This configuration allows the cavity to exert an additional damping effect, making the contact between the leveling element 20 and the ground more flexible and simultaneously reducing the manufacturing costs of the leveling element 20. Furthermore, several support columns can be installed at regular intervals within the cavity. This not only allows the cavity to act as a damping element, but the support columns also transfer the weight of the device body 10 to the ground more efficiently. This ensures that the device body 10 remains fully in contact with the ground and is stably held in an upright position.

[0075] In the present embodiment, the support portion 32 and the main portion 31 are integrally formed. The above adjustment ensures that the circuit board 30 has sufficient structural strength, thus increasing its durability.

[0076] In an optional embodiment, the support section 32 is detachably connected to the main section 31. This configuration allows for repairs or replacement of the circuit board 30 to be performed by simply replacing the corresponding support section 32 or main section 31 without having to replace the entire circuit board 30. This simplifies the work of maintenance personnel and reduces maintenance costs.

[0077] In an optional embodiment, the support section 32 is rotatably connected to the main section 31, and the leveling element 20 is positioned on a side of the support section 32 facing away from the main section 31. Specifically, pivot holes are provided at the mutually facing ends of the main section 31 and the support section 32. The rotating shaft passes through the upper pivot holes of both components, allowing the support section 32 to rotate relative to the main section 31. Due to the rotatable arrangement of the support section 32, the leveling element 20 located on the support section 32 can maintain constant surface contact with the ground following gravity. This increases the contact area between the leveling element 20 and the ground, improving the stability of the ground contact.

[0078] In the present embodiment, the main section 31 or the support section 32 is provided with a positioning element, wherein the leveling element 20 is provided with a counter-element, wherein the counter-element and the positioning element snap together, so that the leveling element 20 is pushed onto the support section 32. Specifically, the positioning element can be a projection while the counterpart represents a recess, or the positioning element can be a recess while the counterpart is a projection. As a result, the leveling element 20 is fixed to the support section 32 by a snap-in connection. The snap-in connection between the leveling element 20 and the support section 32 facilitates assembly and disassembly and simultaneously ensures a stable connection during operation.

[0079] In this embodiment, the contact area of the support section 32 with the ground is the support surface when the leveling element 20 is not attached to the circuit board 30. After the leveling element 20 is attached to the circuit board 30, the area of the leveling element 20 can be larger, equal to, or smaller than the support surface. Specifically, if the area of the leveling element 20 is smaller than the support surface, the leveling element 20 is located in the center of the support section 32 to ensure contact stability. Of course, the leveling element 20 can also be adapted to the support surface, i.e., the surfaces are equal in size to enable more complete contact with the ground. Furthermore, the area of the leveling element 20 can also be larger than the support surface, i.e., the edges of the leveling element 20 protrude beyond the edges of the support surface, which further increases contact stability with the ground.The above methods can be selected according to actual needs.

[0080] In an optional embodiment, the hand mower may not include a leveling element 20. Specifically, the hand mower comprises a device body 10, a device body height adjustment element 60, a control plate 30, a front wheel assembly 40, a rear wheel assembly 50, and a cutting element 70. The rear wheel assembly 50 comprises a rotating shaft 51 and paired rear wheels 52, wherein the two ends of the rotating shaft 51 are connected to the paired rear wheels 52, and the rotating shaft 51 is mounted on the device body 10. The rotating shaft 51 is connected to the device body 10 by two mounting points. The straight line connecting the two mounting points forms a first axis, and the straight line connecting the circle centers of the paired rear wheels 52 forms a second axis, the first axis not being coaxial with the second axis.wherein the device body height adjustment element 60 comprises at least two switching positions and the device body height adjustment element 60 drives the rear wheel 52 to rotate about the first axis as the circle center to realize a height adjustment, wherein the switching plate 30 serves to fold a handle of the device body 10 and to keep the device body 10 upright while the handle is in the retracted state, wherein the switching plate 30 comprises a main section 31 and a support section 32, wherein the main section 31 is connected to the device body 10, while the support section 32 is used for direct contact with the ground, wherein the rear wheel 52 runs tangentially to the ground while the device body 10 is in the upright state, wherein, when the device body height adjustment element 60 is in the lowest switching position,a tangent of the rear wheel 52 L1 located on a side of the rear wheel 52 facing away from the front wheel assembly 40 and passing through a preset point W of the support section 32, while, when the device body height adjustment element 60 is in the highest switching position, a tangent of the rear wheel 52 L2 located on the side of the rear wheel 52 facing away from the front wheel assembly 40 and passing through the preset point W of the support section 32, wherein the angle β between the tangent L1 and the tangent L2 is an acute angle.

[0081] Furthermore, it is provided that in the absence of the leveling element 20, the contact point of the support section 32 with the ground and the contact point of the rear wheel 52 with the ground form a straight line L, wherein the distance between the intersection point of the vertical line on which the center of gravity of the device body 10 lies with the straight line L and the center of the straight line L is less than or equal to ±150 mm.

[0082] The concrete structure of the circuit board 30 and the leveling element 20 is explained below. First embodiment

[0083] In the present embodiment, the support section 32 is arranged at an angle to the main section 31. That is, the support section 32 and the main section 31 are arranged in an L-shaped curve. As a result, the side of the leveling element 20 attached to the support section 32 facing the ground presents a large surface, ensuring a larger contact area and increasing the stability of the contact with the ground.

[0084] Specifically, the angle between the support section 32 and the main section 31 is 90°. The main section 31 is arranged vertically, while the support section 32 is bent inward. This arrangement allows the leveling element 20 mounted on the support section 32 to have the largest possible contact area with the ground. The inward bend saves space and prevents the support section 32 from exceeding the width of the device body 10. Of course, the angle between the support section 32 and the main section 31 can also be different, and the support section 32 can also be bent outward. This can be selected according to actual needs.

[0085] As in Fig. As shown in Figure 10, the two ends of the leveling element 20 are each provided with a buckle structure, and the buckle structure engages with the edge of the support portion 32 and is thus fixed. Specifically, the leveling element 20 has a groove 21. With respect to Fig. 10, locking blocks 24 are attached to the inner walls of the groove 21 at the top and bottom. A gap exists between the locking blocks 24 and the bottom of the groove 21. The support section 32 is located in the space between the locking blocks 24 and the bottom of the groove 21 and is defined by the locking blocks 24, which engage with the top and bottom edges of the support section 32. Furthermore, the end of the support section 32 remote from the main section 31 has a limiting section. This limiting section is bent into an L-shape to fix the leveling element 20 and prevent the leveling element 20 from slipping off the end of the support section 32.

[0086] In an optional embodiment similar to the arrangement in Fig. 10, the leveling element 20 has a groove 21 which extends in the horizontal direction according to Fig. 10. The minimum distance between opposing surfaces within the leveling element 20 is less than the thickness of the support section 32, so that the leveling element 20 can be slid over the support section 32. It should be noted that in Fig. 10, the thickness of the support portion 32 represents the vertical dimension. In the present embodiment, the leveling member 20 is designed as a U-shaped structure with both sides bent inward. Therefore, after being slid onto the support portion 32, it can be firmly clamped to the support portion 32 without the need for additional fastening structures, which is simple and practical. Furthermore, a clamping member may be attached to the inner wall of the groove 21 to slide the leveling member 20 onto the support portion 32. By providing the clamping member, the connection strength between the leveling member 20 and the support portion 32 can be further increased.

[0087] Furthermore, as in Fig. As shown in Figures 3, 11 to 16, a mounting hole 33 is provided in the main section 31 or the support section 32 to ensure a stable connection between the leveling element 20 and the circuit board 30. The mounting hole 33 is a closed hole.

[0088] Furthermore, the circuit board 30 further includes a fastening element, and the leveling element 20 is connected and fixed to the support section 32 via the mounting hole 33 and the fastening element. By providing the fastening element and the mounting hole for connection and assembly, the leveling element 20 is securely fixed to the support section 32, thereby preventing detachment of the leveling element 20 as much as possible and reducing unnecessary repairs or replacements.

[0089] In the present embodiment, the fastening element comprises a screw, wherein the leveling element 20 is provided with a mounting hole corresponding to the mounting opening 33, and wherein the screw passes through the mounting hole 33 and projects into the mounting hole to be connected and fixed to the leveling element 20. Specifically, the mounting opening may be a threaded hole for connecting a screw to the leveling element 20. Of course, the fastening element may also comprise other structures such as rivets, which can be selected according to actual needs.

[0090] In an optional embodiment, as in Fig. As shown in Figure 17, the mounting hole 33 is an open hole. It should be understood that a closed hole is not connected to the edge of the component in which the mounting hole 33 is located, while an open hole is connected to the edge of the component.

[0091] In this embodiment, as in Fig. As shown in Figure 12, the minimum distance h between the edge of the mounting hole 33 and the outer edge of the support portion 32 is more than 2 mm when the mounting hole 33 is located in the support portion 32. This setting ensures that the mounting hole 33 does not affect the structural strength of the support portion 32, thereby ensuring the service life of the support portion 32.

[0092] In an optional embodiment, as in Fig. As shown in Figure 12, the first end 201 of the leveling element 20 is slid over the support section 32, while the second end 202 of the leveling element 20 extends from the support section 32 to the main section 31. The second end 202 of the leveling element 20 is connected and fixed to the circuit board 30 through the mounting hole 33 and a fastening element. Specifically, the first end of the leveling element 20 and the support section 32 are the ends remote from the main section 31. The mounting opening 33 is provided in the support section 32 and is located near the second end of the support section 32. The leveling element 20 is L-shaped, and the first end 201 of the leveling element 20 has a sliding opening adapted to the support section 32 so that the extended end of the support section 32 is guided through the first end 201 of the leveling element 20.The second end 202 of the leveling element 20 is flush with or protrudes beyond the bending surface of the main section 31 and the support section 32. The leveling element 20 is then connected and fixed by a fastener that is guided through the mounting opening 33.

[0093] In an optional embodiment, as in Fig. 11, the mounting hole 33 is provided in the main portion 31. The leveling element 20 is U-shaped, and the first end 201 of the leveling element 20 has a sliding hole adapted to the support portion 32. As a result, the extended end of the support portion 32 is passed through the first end of the leveling element 20. The second end 202 of the leveling element 20 abuts the main portion 31 and is then connected and fixed to the leveling element 20 by a fastener passed through the mounting hole 33. In this embodiment, the second end 202 of the leveling element 20 additionally has a through-hole 22, so that the fastener is passed sequentially through the mounting hole 33 and the through-hole 22 to connect and fix the leveling element 20 to the main portion 31.

[0094] In an optional embodiment, which differs from the structure in Fig. 11, the first end of the support section 32 has a limiting section that is bent into an L shape. A mounting opening 33 is also provided at the first end of the support section 32, and the first end of the leveling element 20 also has a through-hole 22. Two fastening elements are provided, each of which is guided through the two through-holes 22 and the mounting opening 33, in order to connect and fix the leveling element 20 to the support section 32.

[0095] It should be noted that the mounting holes 33 and through holes 22 may also be provided multiple times at the same position to increase the connection strength.

[0096] In an optional embodiment, it is provided that, as in Fig. 14, a protrusion portion 23 is arranged on the leveling element 20, one end of the protrusion portion 23 being a locking end, and the protrusion portion 23 passing through the mounting hole 33 and locking with the support portion 32. Specifically, the mounting hole 33 is provided in the support portion 32, and the protrusion portion is located on the side of the leveling element 20 facing the support portion 32. The protrusion portion is positioned corresponding to the mounting hole 33, and the locking end of the protrusion portion 23 is passed through the mounting hole 33 to lock and abut with the support portion 32. Furthermore, the protrusion portion 23 can be provided singly or multiple times. If a single protrusion portion 23 is provided, it is located in the center of the leveling element 20.If there are several projection sections 23, there are also several mounting openings 33, wherein the projection sections 23 are evenly distributed over the leveling element 20 in order to increase the connection strength.

[0097] In an optional embodiment, the support section 32 has a receiving groove and the mounting opening 33, and the mounting opening 33 communicates with the receiving groove, wherein the opening of the receiving groove faces away from the device body 10, wherein the leveling element 20 is received in the receiving groove, wherein the fastening element passes through the mounting opening 33 and is connected and fixed to the leveling element 20. Specifically, the support section 32 is U-shaped, thereby forming a receiving groove. The dimensions of the leveling element 20 are adapted to the receiving groove so that it fits precisely into the receiving groove and is then connected and fixed to the support section 32 by a fastening element. Of course, the support section 32 can also have a mounting opening 33, while the leveling element 20 has a receiving groove. The support section 32 then has a locking projection that is adapted to the receiving groove.The locking projection fits exactly into the receiving groove, and then the support section 32 is connected and fixed to the leveling element 20 by a fastening element.

[0098] In an optional embodiment, it is provided that the two ends of the leveling element 20 are each provided with a first locking portion and a second locking portion, respectively, and at least one of the first locking portion and the second locking portion is locked to the mounting opening 33. Specifically, a mounting opening 33 is provided on the main portion 31, and the first locking portion at the second end of the leveling element 20 locks to the mounting opening 33 on the main portion 31. Furthermore, the first end of the support portion 32 can also have a mounting opening 33, so that the first locking portion is locked to the mounting opening 33 on the support portion 32, thereby further increasing the connection strength between the leveling element 20 and the support portion 32.

[0099] Furthermore, in addition to being connected via the mounting hole 33 and the fastening element, the leveling element 20 can also be glued to the support section 32. Thus, the leveling element 20 can be directly connected and fixed to the support section 32 without the need for additional structural components, which is quick and easy.

[0100] In this embodiment, to accommodate various connection methods, the support portion 32 may have at least one of the following shapes or a combination of these shapes: I-shaped, J-shaped, L-shaped, T-shaped, H-shaped, C-shaped, or U-shaped. This can be selected according to actual needs.

[0101] In the present embodiment, it is provided that a side of the leveling element 20 facing the ground is a flat surface, an arcuate surface, a trapezoidal surface or a sharp-edged structure. Second embodiment

[0102] The present embodiment differs from the first embodiment in the structure of the main portion 31 and the support portion 32.

[0103] Specifically, in the present embodiment, the support portion 32 and the main portion 31 are arranged in the same plane or in parallel planes. That is, the support portion 32 and the main portion 31 are both arranged vertically. The above-described arrangement reduces the contact area between the circuit board 30 and the floor, thereby keeping the contact area of the leveling element 20 with the floor relatively small. In this way, wear on the floor is reduced as much as possible.

[0104] In the present embodiment, the minimum distance h between the side of the mounting hole 33 facing the ground in the upright state and the outermost edge of the support portion 32 facing the ground is more than 2 mm when the mounting hole 33 is a closed hole as shown in Fig. 3. Specifically, the edge of the support section 32 is not a straight line, but a curve or arc with continuous bending sections. Therefore, the distance between the mounting hole 33 and the outermost edge of the support section 32 varies at different positions. This adjustment ensures that the mounting hole 33 does not compromise the structural strength of the support section 32, thereby ensuring the service life of the support section 32.

[0105] As in Fig. 15, the leveling element 20 has a groove 21 which extends in the vertical direction according to Fig. 15. The minimum distance between opposing surfaces within the leveling element 20 is less than the thickness of the support section 32, so that the leveling element 20 can be pushed onto the support section 32. In Fig. 15, the thickness of the support portion 32 is the horizontal dimension. In the present embodiment, the leveling element 20 is designed as a U-shaped structure with both sides bent inward. This allows it to be firmly clamped to the support portion 32 after being slid onto the support portion 32 without the need for additional fastening structures, which is simple and practical.

[0106] Furthermore, as in Fig. As shown in Figure 16, a clamping element 25 can be attached to the inner wall of the groove 21 so that the leveling element 20 is pushed onto the support section 32. By providing the clamping element 25, the connection strength between the leveling element 20 and the support section 32 can be further increased.

[0107] In an optional embodiment, it is provided that the leveling element 20, as in Fig. 15, has a groove 21 so that the leveling element 20 is pushed onto the support section 32, wherein the two ends of the leveling element 20 are each provided with a through hole 22 which corresponds to the mounting opening 33, wherein the fastening element passes through the two through holes 22 and the mounting opening 33 so that the leveling element 20 and the support section 32 are connected and fastened to each other.

[0108] In an optional embodiment, a first end of the leveling element 20 is pushed onto the support section 32 and a second end of the leveling element 20 extends from the support section 32 to the main section 31, wherein one or two ends of the leveling element 20 are connected and fixed to the main section 31 via the mounting opening 33 and the fastening element. Specifically, the first end of the leveling element 20 and the support section 32 are the ends facing away from the main section 31. The mounting opening 33 is arranged either in the support section 32 or in the main section 31, depending on the length of the leveling element 20. The leveling element 20 is L-shaped, and the first end of the leveling element 20 has a push-on opening that is adapted to the support section 32. As a result, the extended end of the support section 32 is guided through the first end of the leveling element 20.Subsequently, the second end of the leveling element 20 is connected and fixed to the support section 32 or the main section 31 by a fastening element which is passed through the mounting opening 33.

[0109] In an optional embodiment, a protrusion portion is arranged on the leveling element 20, one end of which is a locking end, and the protrusion portion passes through the mounting opening 33 and engages with the support portion 32. Specifically, the mounting opening 33 is provided in the support portion 32 or in the main portion 31, and the protrusion portion is located on the side of the leveling element 20 facing the circuit board 30. The protrusion portion is positioned correspondingly to the mounting opening 33, and the locking end of the protrusion portion is guided through the mounting opening 33 to engage and abut the circuit board 30. Furthermore, the protrusion portion can be provided singly or multiple times. If a single protrusion portion is provided, it is located in the center of the leveling element 20.If there are multiple projection sections, there are also multiple mounting holes 33, wherein the projection sections are evenly distributed over the leveling element 20 in order to increase the connection strength.

[0110] In an optional embodiment, the leveling element 20 has a receiving groove and a through-hole 22, the through-hole 22 communicating with the receiving groove, one end of the support section 32 being suitably received in the receiving groove, a mounting opening 33 being formed in the support section 32, the circuit board 30 further comprising a fastening element, and the fastening element passes through the through-hole 22 and the mounting opening 33 and is connected and fixed to the support section 32. Specifically, the leveling element 20 is U-shaped, thereby forming a receiving groove. The dimensions of the end of the support section 32 are adapted to the receiving groove so that it fits precisely into the receiving groove and is then connected and fixed to the leveling element 20 by a fastening element.Of course, the end of the support section 32 can also be U-shaped, forming a receiving groove whose opening points away from the device body 10. The leveling element 20 is inserted into the receiving groove, and a fastening element is passed through the mounting opening 33 to connect and fix the leveling element 20.

[0111] From the above descriptions, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: The hand mower comprises a device body 10, a leveling element 20, a device body height adjustment element 60, a switching plate 30, a front wheel assembly 40, a rear wheel assembly 50, and a cutting element 70. The rear wheel assembly 50 comprises a rotating shaft 51 and paired rear wheels 52. The two ends of the rotating shaft 51 are connected to the paired rear wheels 52, and the rotating shaft 51 is mounted on the device body 10. The rotating shaft 51 is connected to the device body 10 by two mounting points. The straight line on which the connecting line of the two mounting points is located forms a first axis. The straight line on which the connecting line of the circle centers of the paired rear wheels 52 is locatedforms a second axis, wherein the first axis is not coaxial with the second axis, wherein the device body height adjustment element 60 comprises at least two switching positions and the device body height adjustment element 60 drives the rear wheel 52 to rotate about the first axis as the center of the circle in order to realize a height adjustment, wherein the switching plate 30 serves to fold a handle of the device body 10 and to hold the device body 10 upright while the handle is in the retracted state, wherein the switching plate 30 comprises a main section 31 and a support section 32, wherein the main section 31 is connected to the device body 10, while the support section 32 is provided with the leveling element 20 for direct contact with the ground, wherein the rear wheel assembly 50 runs tangentially to the ground,while the device body 10 is in an upright position. In the individual switching positions of the device body height adjustment element 60, the angle β between the individual straight lines L formed by the contact point of the leveling element 20 with the ground and the contact point of the rear wheel 52 with the ground is an acute angle. The arrangement of the axes of the rear wheel 52 and the rotating shaft 51 in a non-coaxial configuration enables the device body height adjustment element 60 to rotate the rear wheel 52 for height adjustment. In all switching positions, the angle β between the straight lines L formed by the contact point of the leveling element 20 with the ground and the contact point of the rear wheel 52 with the ground is an acute angle. This ensures that the device body 10 has a sufficiently wide and stable support surface in the upright storage position in all switching positions.to withstand minor vibrations or external impacts. At the same time, the change in the angle between the rear wheel 52 and the support section 32 is kept within a small angular range at different switching positions. By optimizing the support structure and geometric parameters, mechanical performance is improved, thereby better solving the problem of center of gravity fluctuations due to structural changes during the mechanical movement process. This ensures that the device can reliably withstand complex external factors, improves overall tipping stability, and allows the machine to be stored upright more safely and stably. In addition, the attachment of the leveling element 20 to the support section 32 ensuresthat it can adapt to different terrain and provide optimal support for the device body 10. In combination with the coordinated effect of the position of the rear wheel assembly 50, the stability of the device body 10 is ensured in all gear positions. At the same time, ground wear caused by friction is effectively reduced, an additional damping effect is achieved, and the pressure on the support section 32 is distributed, further increasing the stability of the device body 10 and eliminating the risk of the device body 10 wobbling or tipping over in the storage state.

[0112] It should be understood that the described embodiments represent some of the embodiments of the present utility model, rather than all of the embodiments. Other changes or modifications in various forms that can be obtained by those skilled in the art from the embodiments of the utility model without inventive steps are also within the scope of the utility model.

Claims

[1] Hand mower, characterized bythat it comprises a device body (10), a leveling element (20), a device body height adjustment element (60), a switching plate (30), a front wheel assembly (40), a rear wheel assembly (50), and a cutting element (70), wherein the rear wheel assembly (50) comprises a rotating shaft (51) and paired rear wheels (52), wherein the two ends of the rotating shaft (51) are connected to the paired rear wheels (52), and the rotating shaft (51) is mounted on the device body (10), wherein the rotating shaft (51) is connected to the device body (10) by two mounting points, wherein the straight line on which the connecting line of the two mounting points is located forms a first axis, wherein the straight line on which the connecting line of the circle centers of the paired rear wheels (52) is located forms a second axis, wherein the first axis is not coaxial with the second axis,wherein the device body height adjustment element (60) comprises at least two switching positions and the device body height adjustment element (60) drives the rear wheel (52) to rotate about the first axis as the circle center in order to realize a height adjustment, wherein the switching plate (30) serves to fold a handle of the device body (10) and to keep the device body (10) upright while the handle is in the retracted state, wherein the switching plate (30) comprises a main section (31) and a support section (32), wherein the main section (31) is connected to the device body (10), while the support section (32) is provided with the leveling element (20) for direct contact with the ground, wherein the rear wheel (52) runs tangentially to the ground while the device body (10) is in the upright state, wherein, when the device body height adjustment element (60) is in the lowest switching position,a tangent of the rear wheel (52) L1 located on a side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through a preset point W of the leveling element (20), wherein, when the device body height adjustment element (60) is in the highest switching position, a tangent of the rear wheel (52) L2 located on the side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through the preset point W of the leveling element (20), wherein the angle β between the tangent L1 and the tangent L2 is an acute angle. [2] Hand mower according to claim 1, characterized by that in at least one of the switching positions at least a part of the leveling element (20) comes into contact with the ground, wherein the hardness of the leveling element (20) is less than the hardness of the support section (32). [3] Hand mower according to claim 1, characterized bythat in the upright state, the contact point of the leveling element (20) with the ground and the contact point of the rear wheel (52) with the ground form a straight line L, wherein the distance between the intersection point of the vertical line on which the center of gravity of the device body (10) lies with the straight line L and the center of the straight line L is less than or equal to ±150 mm. [4] Hand mower according to claim 1, characterized by that the included angle β is less than or equal to 15°. [5] Hand mower according to claim 1, characterized by , that the size of the rear wheel (52) is equal to the size of the front wheel of the front wheel assembly (40), wherein the angle of rotation θ of the rear wheel (52) is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than or equal to the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element (60); or wherein the size of the rear wheel (52) is greater than or equal to the size of the front wheel of the front wheel assembly (40) and the angle of rotation θ of the rear wheel (52) is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than the vertical distance of the lowest cutting plane of the hand mower between the highest and the lowest switching position of the device body height adjustment element (60); wherein the lowest cutting plane is the cutting plane when cutting by the cutting element (70) in the lowest switching position. [6] Hand mower according to claim 1, characterized by that the radius size of the rear wheel (52) is 20 mm larger than the distance between the second axle and the first axle. [7] Hand mower according to claim 1, characterized by that the support section (32) is arranged at an angle to the main section (31). [8] Hand mower according to claim 1, characterized bythat the support section (32) and the main section (31) are arranged in the same plane or in parallel planes. [9] Hand mower according to claim 7 or 8, characterized by that a mounting opening (33) is formed in the main section (31) or the support section (32), and the mounting opening (33) is a closed opening or an open opening. [10] Hand mower according to claim 9, characterized by in the case where the mounting opening (33) is located in the main section (31), or the mounting opening (33) is located in the support section (32) and the support section (32) and the main section (31) are arranged in the same plane or in parallel planes, the minimum distance h between the side of the mounting opening (33) facing the ground in the upright state and the outermost edge of the support section (32) facing the ground is more than 2 mm when the mounting opening (33) is a closed opening. [11] Hand mower according to claim 9, characterized by that the support section (32) is arranged at an angle to the main section (31) and the mounting opening (33) is arranged on the support section (32), and wherein, when the mounting opening (33) is a closed opening, the minimum distance h between the peripheral edge of the mounting opening (33) and the outer peripheral edge of the support section (32) is greater than 2 mm. [12] Hand mower according to claim 9, characterized by that the circuit board (30) further comprises a fastening element and the leveling element (20) is connected and fixed to the support section (32) via the mounting opening (33) and the fastening element. [13] Hand mower according to claim 7 or 8, characterized bythat the main section (31) or the support section (32) is provided with a positioning element, wherein the leveling element (20) is provided with a counter element, wherein the counter element and the positioning element engage together so that the leveling element (20) is placed on the support section (32). [14] Hand mower according to claim 7 or 8, characterized by that the leveling element (20) has a groove (21), wherein the minimum distance between any opposing surfaces in the leveling element (20) is smaller than the thickness of the support section (32), so that the leveling element (20) is placed on the support section (32); or wherein the inner wall of the groove (21) is provided with a clamping element (25) and the minimum distance between any opposing surfaces of the leveling element (20) is smaller than the thickness of the support section (32), so that the leveling element (20) is placed on the support section (32). [15] Hand mower according to claim 9, characterized by that a first end of the leveling element (20) is placed on the support section (32) and a second end of the leveling element (20) extends from the support section (32) to the main section (31), wherein the circuit board (30) further comprises a fastening element and one or two ends of the leveling element (20) are connected and fixed to the circuit board (30) via the mounting opening (33) and the fastening element. [16] Hand mower according to claim 9, characterized by in that the fastening element comprises a screw, wherein the leveling element (20) is provided with a mounting hole corresponding to the mounting opening (33), and wherein the screw passes through the mounting opening (33) and projects into the mounting hole in order to be connected and fixed to the leveling element (20). [17] Hand mower according to claim 9, characterized bythat a projection portion (23) is arranged on the leveling element (20), wherein one end of the projection portion (23) is a locking end and the projection portion (23) passes through the mounting opening (33) and locks together with the support portion (32). [18] Hand mower according to claim 9, characterized by that the two ends of the leveling element (20) are each provided with a first locking portion and a second locking portion, respectively, and at least one of the first locking portion and the second locking portion is locked to the mounting opening (33). [19] Hand mower according to claim 9, characterized byin that the leveling element (20) has a groove (21) so that the leveling element (20) is placed on the support section (32), wherein the two ends of the leveling element (20) are each provided with a through-hole (22) which corresponds to the mounting opening (33), wherein the circuit board (30) further comprises a fastening element and the fastening element passes through the two through-holes (22) and the mounting opening (33) so that the leveling element (20) and the support section (32) are connected and fastened to one another. [20] Hand mower according to claim 7, characterized by that the two ends of the leveling element (20) are each provided with a buckle structure and the buckle structure engages and is fixed with the edge of the support section (32). [21] Hand mower according to claim 8, characterized byin that the leveling element (20) has a receiving groove and a through hole (22), wherein the through hole (22) is communicated with the receiving groove, wherein one end of the support section (32) is fittingly received in the receiving groove, wherein a mounting opening (33) is formed in the support section (32), wherein the circuit board (30) further has a fastening element and the fastening element passes through the through hole (22) and the mounting opening (33) and is connected and fixed to the support section (32). [22] Hand mower according to claim 9, characterized byin that the support section (32) has a receiving groove and the mounting opening (33), and the mounting opening (33) is communicated with the receiving groove, wherein the opening of the receiving groove faces away from the device body (10), wherein the leveling element (20) is received in the receiving groove, wherein the circuit board (30) further has a fastening element, and the fastening element passes through the mounting opening (33) and is connected and fixed to the leveling element (20). [23] Hand mower according to one of claims 6 to 8, characterized by that the circuit plate (30) is made of a hard material. [24] Hand mower according to claim 23, characterized by that the circuit plate (30) is made of a metal material. [25] Hand mower according to one of claims 6 to 8, characterized by that the leveling element (20) is made of a soft material. [26] Hand mower according to claim 25, characterized bythat the soft material is at least one of the materials plastic, silicone, rubber, Teflon, polyurethane foam, polyurethane elastomer or soft polyurethane. [27] Hand mower according to one of claims 6 to 8, characterized by , that the leveling element (20) is a solid structure; or the leveling element (20) is a hollow structure; or the leveling element (20) has a cavity in which several support columns are arranged at intervals. [28] Hand mower according to one of claims 6 to 8, characterized by that the support section (32) is detachably connected to the main section (31); or the support section (32) and the main section (31) are formed in one piece. [29] Hand mower according to one of claims 6 to 8, characterized by that the leveling element (20) is glued to the support section (32). [30] Hand mower according to one of claims 6 to 8, characterized bythat the support section (32) has at least one of the shapes I-shape, J-shape, L-shape, T-shape, C-shape, U-shape or a combination thereof. [31] Hand mower according to one of claims 6 to 8, characterized by that a side of the leveling element (20) facing the ground is a flat surface, an arcuate surface, a trapezoidal surface or a sharp-edged structure. [32] Hand mower according to claim 1, characterized by that in the upright position the angle α between the device body (10) and the vertical direction is 0° to 20°. [33] Hand mower according to claim 1, characterized by that when the device body (10) is in the upright position, the levelling element (20) is in line contact with the ground in each of the switching positions. [34] Hand mower according to claim 1, characterized by that when the device body (10) is in the upright position, the levelling element (20) is in surface contact with the ground in each of the switching positions. [35] Hand mower according to claim 1, characterized by that under the influence of the device body height adjustment element, the contact position between the levelling element (20) and the ground changes with the switching position. [36] Hand mower according to claim 1, characterized by that the support section (32) is rotatably connected to the main section (31) and the leveling element (20) is positioned on a side of the support section (32) facing away from the main section (31). [37] Hand mowers, characterized bythat it comprises a device body (10), a device body height adjustment element (60), a switch plate (30), a front wheel assembly (40), a rear wheel assembly (50), and a cutting element (70), wherein the rear wheel assembly (50) comprises a rotating shaft (51) and paired rear wheels (52), wherein the two ends of the rotating shaft (51) are connected to the paired rear wheels (52), and the rotating shaft (51) is mounted on the device body (10), wherein the rotating shaft (51) is connected to the device body (10) by two mounting points, wherein the straight line on which the connecting line of the two mounting points is located forms a first axis, wherein the straight line on which the connecting line of the circle centers of the paired rear wheels (52) is located forms a second axis, wherein the first axis is not coaxial with the second axis,wherein the device body height adjustment element (60) comprises at least two switching positions and the device body height adjustment element (60) drives the rear wheel (52) to rotate about the first axis as the circle center in order to realize a height adjustment, wherein the switching plate (30) serves to fold a handle of the device body (10) and to keep the device body (10) upright while the handle is in the retracted state, wherein the switching plate (30) comprises a main section (31) and a support section (32), wherein the main section (31) is connected to the device body (10), while the support section (32) is used for direct contact with the ground, wherein the rear wheel (52) runs tangentially to the ground while the device body (10) is in the upright state, wherein, when the device body height adjustment element (60) is in the lowest switching position,a tangent of the rear wheel (52) located on a side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through a preset point W of the support section (32), wherein, when the device body height adjustment element (60) is in the highest switching position, a tangent of the rear wheel (52) located on the side of the rear wheel (52) facing away from the front wheel assembly (40) and passing through the preset point W of the support section (32), wherein the angle β between the tangent L1 and the tangent L2 is an acute angle. [38] Hand mower according to claim 37, characterized bythat in the upright state, the contact point of the support section (32) with the ground and the contact point of the rear wheel (52) with the ground form a straight line L, wherein the distance between the intersection point of the vertical line on which the center of gravity of the device body (10) lies with the straight line L and the center of the straight line L is less than or equal to ±150 mm. [39] Hand mower according to claim 37, characterized by that the included angle β is less than or equal to 15°. [40] Hand mower according to claim 37, characterized by , that the size of the rear wheel (52) is equal to the size of the front wheel of the front wheel assembly (40), wherein the angle of rotation θ of the rear wheel (52) is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than or equal to the vertical distance of the lowest cutting plane of the hand mower between the highest and lowest switching positions of the device body height adjustment element (60); or wherein the size of the rear wheel (52) is greater than or equal to the size of the front wheel of the front wheel assembly (40) and the angle of rotation θ of the rear wheel (52) is 90°≤θ≤270°, wherein the distance between the second axis and the first axis is greater than the vertical distance of the lowest cutting plane of the hand mower between the highest and the lowest switching position of the device body height adjustment element (60); wherein the lowest cutting plane is the cutting plane when cutting by the cutting element (70) in the lowest switching position. [41] Hand mower according to claim 37, characterized by that the radius size of the rear wheel (52) is 20 mm larger than the distance between the second axle and the first axle.

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