Height adjustment device for a garden tool

Abstract

The utility model discloses a height adjusting device of garden tool belongs to garden tool field, has solved the problem of the sealing effect of prior art's height adjusting device is poorer, the technical scheme of solving this problem includes the casing and height adjusting rod, and the casing is equipped with the gear slot for the height adjusting rod partial extension casing, and the casing is equipped with the dustproof board still, and the dustproof board slidingly is established on the casing, and the dustproof board and the casing are equipped with the elastic part, and the dustproof board has the tendency of keeping shielding gear slot under the elastic force of elastic part, when the height adjusting rod moves relative to the casing to switch gear, and the height adjusting rod pushes the dustproof board and slides to avoid. The utility model is used for improving the sealing effect of height adjusting device.

Description

Technical Field

[0001] This utility model relates to the field of garden tools, and in particular to a height adjustment device for garden tools. Background Technology

[0002] Mechanical tools used for mowing lawns, vegetation, etc., typically consist of a cutter head, engine, wheels, a walking mechanism, blades, a handle, and controls. The cutter head is mounted on the wheels, and the engine is mounted on the cutter head. The blades are mounted on the engine's output shaft. To adapt to different grass heights or terrain requirements, these types of mechanical tools are usually equipped with a height adjustment device to adjust the height of the blades relative to the ground. For example, utility model CN220457926U discloses a housing and a height adjustment lever. The housing has multiple gear slots. By switching the height adjustment lever to different gear slots, the cutting height can be adjusted. However, in order to achieve smooth switching between multiple gears, the housing in the gear slot area needs to be designed as an arched structure with sufficient operating space, resulting in a complex overall structure and large volume. Moreover, when the height adjustment lever occupies only one gear slot, the remaining unused gear slots are still completely exposed. These empty, open gear slots directly connect the inside of the machine to the external environment, which can easily become channels for dust, grass clippings, water stains and other debris to enter the equipment during operation. After contaminants enter the housing, they may not only cause the height adjustment device to jam and switch difficult, but may also cause wear and corrosion of internal parts, affecting the reliability of equipment operation. Utility Model Content

[0003] The purpose of this invention is to provide a height adjustment device for garden tools, which solves the problem of poor sealing effect of existing height adjustment devices and improves the sealing effect of height adjustment devices.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a height adjustment device for garden tools, comprising a housing and a height adjustment rod, wherein the housing is provided with a gear slot for the height adjustment rod to extend out of the housing, and the housing is also provided with a dustproof plate, the dustproof plate being slidably disposed on the housing, and an elastic element being provided between the dustproof plate and the housing, the dustproof plate having a tendency to remain in place and cover the gear slot under the elastic force of the elastic element, and when the height adjustment rod moves relative to the housing to switch gears, the height adjustment rod pushes the dustproof plate to slide and avoid it.

[0005] After adopting the above technical solution, this utility model has the following advantages: By setting a sliding dustproof plate on the casing and using elastic elements to automatically cover the gear slot in the non-adjusted state, dynamic sealing of the gear area is achieved. Under normal conditions, the dustproof plate covers the gear slot area, blocking the passage for dust, grass clippings, water stains and other debris to enter the equipment, significantly improving the dustproof and waterproof performance of the device. When the user adjusts the height and pushes the height adjustment rod to move, the height adjustment rod naturally pushes the dustproof plate to slide and avoid it, without additional operation. After the adjustment is completed, the dustproof plate automatically resets under the action of the elastic elements, re-sealing the gear slot and ensuring the sealing effect.

[0006] Furthermore, the gear slot includes multiple gear grooves and a connecting groove connecting the multiple gear grooves. The dustproof plate includes a first dustproof part slidably disposed in the connecting groove and multiple second dustproof parts, each of the second dustproof parts being slidably disposed in a gear groove. The elastic element includes a first elastic part disposed between the first dustproof part and the housing, and multiple second elastic parts, each of the second dustproof parts being individually disposed between the second elastic part and the housing.

[0007] By adopting the aforementioned technical solution, a first dustproof part is set in the connecting groove, and an independent second dustproof part is set in each gear groove. A first elastic part and multiple second elastic parts are also configured respectively, so that each dustproof part can cover the corresponding groove opening under the elastic action, thereby achieving segmented dynamic sealing of the entire gear area. No matter which gear the height adjustment rod is in, the unoccupied gear groove and connecting groove can be accurately covered by the corresponding first or second dustproof part, avoiding local exposure and the formation of pollution channels as much as possible. When the height adjustment rod moves, it only pushes the first or second dustproof part that contacts it, while the remaining first and second dustproof parts remain in place and do not participate in the movement. Therefore, the operating resistance of the height adjustment rod is small and the sliding is smooth.

[0008] Furthermore, under the action of the first elastic part and the second dustproof part, there is a tendency for the first dustproof part and the second dustproof part to remain close to each other and fit together to jointly close the gear slot.

[0009] Using the aforementioned technical solution, the first dustproof part and the second dustproof part are tightly fitted together under the action of the first elastic part and the second elastic part to form a continuous and closed protective surface, which together covers the entire gear slot, preventing dust, grass clippings and water stains from entering from the joint of the connecting slot and each gear slot groove as much as possible.

[0010] Furthermore, the plurality of gear slots and the connecting grooves are arranged along the plane of the housing, the first dustproof part slides along the plane of the housing, and the second dustproof part slides along the plane of the housing.

[0011] By adopting the aforementioned technical solution, the layout along the plane of the casing does not require additional space for installation and movement in the three-dimensional direction, which makes the height adjustment device structure of the entire garden tool more flat, adapts to the flat design requirements of the casing, and makes the processing and assembly of the flat structure easier.

[0012] Furthermore, the first elastic part is located on the side of the first dustproof part away from the height adjustment rod, and the second elastic part is located on the side of the second dustproof part away from the height adjustment rod.

[0013] With the above technical solution, the first elastic part is located on the side of the first dustproof part away from the height adjustment rod, and the second elastic part is located on the side of the second dustproof part away from the height adjustment rod. This ensures that the installation positions of the first elastic part and the second elastic part avoid the movement path of the height adjustment rod. When the height adjustment rod pushes the first dustproof part and the second dustproof part to slide and avoid each other, the first elastic part and the second elastic part will not interfere with the height adjustment rod, thus ensuring smooth movement.

[0014] Furthermore, the dustproof plate is provided with guide ribs, the housing is provided with guide grooves that slide with the guide ribs, and the housing is provided with stop ribs, which are used to stop the guide ribs when the dustproof plate is covering the gear slot.

[0015] Through the above technical solution, the movement of the dustproof plate is more precisely guided by the sliding cooperation between the guide rib and the guide groove, ensuring that it does not deviate or jam during horizontal sliding, and that the movement is smooth and reliable. At the same time, the housing is equipped with a stop rib. When the dustproof plate is reset to the position of the blocking slot under the action of the elastic element, the stop rib contacts the guide rib and restricts its continued movement, realizing the positioning of the dustproof plate. This prevents the dustproof plate from excessively retracting or loosening due to excessive pressure or vibration of the elastic element, thereby ensuring that the blocking slot is completely covered as much as possible, and the seal is more reliable.

[0016] Furthermore, the housing is also provided with a receiving groove communicating with the gear slot, the elastic element is located in the receiving groove, and the dustproof plate has a first position where it is pushed into the gear slot by the elastic element and a second position where it is pushed into the receiving groove by the height adjustment rod.

[0017] Through the above technical solution, the receiving groove provides installation space for the elastic element, and at the same time provides storage space for the dustproof plate to avoid the height adjustment rod. When the height adjustment rod pushes the dustproof plate, the dustproof plate enters the receiving groove along the connecting path, realizing the exit from the obstructed area and ensuring the smooth passage of the height adjustment rod.

[0018] Furthermore, the height adjustment device of the garden tool also includes a cover plate, which is installed on the housing and closes the receiving groove. The cover plate is provided with a clearance groove, which is connected to the gear slot, allowing the height adjustment rod to pass through and slide within the gear slot.

[0019] Through the above technical solution, the cover plate is installed on the housing and seals the receiving groove, making the receiving groove a protected internal space. This prevents dust, grass clippings, water stains and other debris from entering the receiving groove from the outside as much as possible, avoiding contamination or jamming of the internal elastic parts and the sliding parts of the dustproof plate. The clearance groove only provides the minimum necessary passage for the height adjustment rod to pass through, and the remaining area is covered by the cover plate. This not only ensures the functional requirements of the height adjustment rod, but also preserves the sealing of the housing surface to the maximum extent, further improving the dustproof and waterproof performance of the whole machine. Moreover, the edge of the clearance groove forms a secondary guide for the height adjustment rod, which, together with the gear groove, further regulates its movement trajectory and reduces shaking and deviation during adjustment.

[0020] Furthermore, the dustproof plate is located between the cover plate and the housing.

[0021] Through the above technical solution, the cover plate and the housing provide vertical and horizontal limits for the dustproof plate, which can constrain it to always slide along the preset plane, avoid vertical warping and displacement during sliding as much as possible, reduce the risk of jamming, and ensure the dustproof plate's shielding effect on the gear slot.

[0022] Furthermore, the gear slots are arranged in a straight line along the surface of the housing in the same plane, and both the cover plate and the dustproof plate are flat plate structures.

[0023] The above technical solution enables the structural layout and movement path of the height adjustment device of the entire garden tool to be concentrated in the same plane, which avoids the need to design complex arched housings or three-dimensional clearance spaces to achieve height adjustment bar switching. It simplifies the housing structure, reduces the volume occupied, and is conducive to the compact layout of the equipment. Moreover, the flat structure is simpler, easier to manufacture and quick to install. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a partial structural cross-sectional view of the height adjustment device for garden tools of this utility model;

[0026] Figure 2 This is an exploded view of the height adjustment device for the garden tools of this utility model;

[0027] Figure 3 This is a schematic diagram of the cover plate in this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the dustproof plate and the elastic element in this utility model;

[0029] Figure 5 This is a schematic diagram of the cavity structure in this utility model;

[0030] Figure 6This is a schematic diagram of the height adjustment lever located in one of the gear grooves in this utility model;

[0031] Figure 7 This is a partial structural diagram of the height adjustment lever located in one of the gear grooves in this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the height adjustment rod located in the connecting groove in this utility model;

[0033] Figure 9 This is a schematic diagram of the part of the structure where the height adjustment rod is located in the connecting groove in this utility model;

[0034] Figure 10 This is a schematic diagram of the structure of the height adjustment lever located in another gear groove in this utility model;

[0035] Figure 11 This is a partial structural diagram of the height adjustment lever located in another gear groove in this utility model;

[0036] In the diagram, 1 is the housing; 10 is the receiving cavity; 101 is the guide groove; 102 is the stop rib; 103 is the receiving groove; 104 is the mounting notch; 105 is the connecting seat; 11 is the gear slot; 111 is the gear groove; 112 is the connecting groove; 12 is the height adjustment rod; 121 is the gripping part; 13 is the dustproof plate; 131 is the first dustproof part; 132 is the second dustproof part; 133 is the guide rib; 134 is the stop part; 14 is the elastic element; 141 is the first elastic part; 142 is the second elastic part; 15 is the cover plate; 151 is the clearance groove; 152 is the marking; and 153 is the connecting lug. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0038] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein.

[0039] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0040] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0041] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0042] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0043] like Figures 1 to 11 As shown, this utility model provides a height adjustment device for garden tools, including a housing 1 and a height adjustment rod 12. The housing 1 is provided with a gear slot 11 for the height adjustment rod 12 to extend out of the housing 1. The housing 1 is also provided with a dustproof plate 13, which is slidably disposed on the housing 1. An elastic element 14 is provided between the dustproof plate 13 and the housing 1. Under the elastic force of the elastic element 14, the dustproof plate 13 tends to keep blocking the gear slot 11. When the height adjustment rod 12 moves relative to the housing 1 to switch gears, the height adjustment rod 12 pushes the dustproof plate 13 to slide and avoid it.

[0044] By setting a sliding dustproof plate 13 on the housing 1 and using an elastic element 14 to automatically cover the gear slot 11 in the non-adjusted state, dynamic sealing of the gear area is achieved. Under normal conditions, the dustproof plate 13 covers the gear slot 11 area, blocking the passage for dust, grass clippings, water stains and other debris to enter the equipment, significantly improving the dustproof and waterproof performance of the device. When the user adjusts the height and pushes the height adjustment rod 12 to move, the height adjustment rod 12 naturally pushes the dustproof plate 13 to slide and avoid it, without additional operation. After the adjustment is completed, the dustproof plate 13 automatically resets under the action of the elastic element 14, re-sealing the gear slot 11 and ensuring the sealing effect.

[0045] To facilitate gripping of the height adjustment lever 12, the part of the height adjustment lever 12 extending out of the housing 1 is provided with a gripping part 121. The outer surface of the gripping part 121 is provided with a concave-convex structure to increase the friction between the fingers and the gripping part 121, to prevent slippage during operation as much as possible, and to improve the operability and safety during the adjustment process.

[0046] To ensure smoother movement of the height adjustment lever 12, the housing 1 is also provided with a receiving groove 103 that communicates with the gear position groove 11. The elastic element 14 is located in the receiving groove 103. The dustproof plate 13 has a first position where it is pushed into the gear position groove 11 by the elastic element 14 and a second position where it is pushed into the receiving groove 103 by the height adjustment lever 12. The first position is the position that blocks the gear position groove 11, and the second position is the position that avoids the height adjustment lever 12. When the height adjustment lever 12 pushes the dustproof plate 13, the dustproof plate 13 enters the receiving groove 103 along the communicating path, realizing the exit from the blocked area and ensuring that the height adjustment lever 12 passes smoothly.

[0047] To further enhance the sealing effect, the height adjustment device of the garden tool also includes a cover plate 15. The cover plate 15 is installed on the housing 1 and closes the receiving groove 103, making the receiving groove 103 a protected internal space. This prevents dust, grass clippings, water stains and other debris from entering the receiving groove 103 from the outside, avoiding contamination or jamming of the internal elastic element 14 and the sliding part of the dustproof plate 13. The cover plate 15 is provided with a clearance groove 151, which is connected to and corresponds one-to-one with the gear groove 11, allowing the height adjustment rod 12 to pass through and slide in the gear groove 11. This ensures the functional requirements of the height adjustment rod 12 while maximizing the sealing of the surface of the housing 1, further improving the dustproof and waterproof performance of the whole machine. Moreover, the edge of the clearance groove 151 forms a secondary guide for the height adjustment rod 12, which, together with the gear groove 11, further regulates its movement trajectory and reduces shaking and deviation during adjustment.

[0048] It should be noted that the housing 1 has a receiving cavity 10, and the receiving groove 103, the gear groove 11, and the dustproof plate 13 are all located inside the receiving cavity 10. The cover plate 15 closes the opening of the receiving cavity 10. After installation, it and the housing 1 together form a closed internal environment, effectively isolating external dust, grass clippings, water stains and other pollutants. The cover plate 15 has connecting lugs 153 on both sides, and the inner wall of the receiving cavity 10 of the housing 1 has corresponding installation notches 104. During assembly, the connecting lugs 153 are aligned and inserted into the installation notches 104, and then locked and fixed with screws to achieve a reliable connection of the cover plate 15. No additional tooling is required to achieve quick alignment, making installation more convenient. At the same time, when maintenance or cleaning is required, only the screws need to be removed to remove the cover plate 15 as a whole, which is convenient for cleaning and inspection of the dustproof plate 13, elastic element 14, gear groove 11 and other components inside the receiving cavity 10, making maintenance convenient.

[0049] The dustproof plate 13 is located between the cover plate 15 and the housing 1. The cover plate 15 and the housing 1 provide vertical limits for the dustproof plate 13, which can constrain it to always slide along the preset plane, avoid vertical warping and offset during sliding as much as possible, reduce the risk of jamming, and ensure the shielding effect of the dustproof plate 13 on the gear slot 11.

[0050] To simplify the structure, the gear slots 11 are arranged in a straight line along the surface of the housing 1 on the same plane. The cover plate 15 and the dustproof plate 13 are both flat structures that fit into the plane. This makes the structural layout and movement path of the entire garden tool's height adjustment device concentrated on the same plane, avoiding the need to design a complex arched housing 1 or three-dimensional clearance space to achieve the switching of the height adjustment lever 12. This simplifies the structure of the housing 1, reduces the volume occupied, and is conducive to the compact layout of the equipment. Moreover, the flat structure is simpler, easier to manufacture, and easier to install quickly.

[0051] To facilitate use, the cover plate 15 is marked with labels 152 for different gear slots 11, so that users can intuitively identify the height value or applicable scenario corresponding to each gear when adjusting the cutting height, without having to bend over to look inside the casing 1 or rely on an external reference table, thus improving the ease of operation and adjustment accuracy.

[0052] To ensure smoother movement of the dustproof plate 13, the dustproof plate 13 is provided with guide ribs 133, and the housing 1 is provided with guide grooves 101 that slide with the guide ribs 133. The guide grooves 101 are located on the bottom wall of the receiving groove 103. Through the sliding cooperation between the guide ribs 133 and the guide grooves 101, the movement of the dustproof plate 13 is guided more precisely, ensuring that it does not deviate or jam during horizontal sliding, and that the movement is smooth and reliable. At the same time, the housing 1 is provided with stop ribs 102. When the dustproof plate 13 is reset to the position of the blocking slot 11 under the action of the elastic element 14, the stop ribs 102 contact the guide ribs 133 and restrict its continued movement, thereby achieving the positioning of the dustproof plate 13. This prevents the dustproof plate 13 from excessively retracting or loosening due to overpressure or vibration of the elastic element 14, thus ensuring that the slot 11 is completely covered as much as possible, and that the seal is more reliable.

[0053] It should be noted that in this application, the elastic element 14 is also located in the guide groove 101. The sidewall of the guide groove 101 forms a lateral limiting structure for the elastic element 14, so as to prevent deformation and displacement during its operation as much as possible.

[0054] Specifically, the gear slot 11 includes multiple gear grooves 111 and a connecting groove 112 connecting the multiple gear grooves 111. The clearance groove 151 is connected to the gear slot 11 and is configured to correspond one-to-one with the gear grooves 111 and the connecting groove 112. The dustproof plate 13 includes a first dustproof part 131 slidably disposed in the connecting groove 112 and multiple second dustproof parts 132. Each second dustproof part 132 is slidably disposed in a gear groove 111. The elastic member 14 includes a first elastic part 141 disposed between the first dustproof part 131 and the housing 1, and multiple second elastic parts 142. Each second dustproof part 132 and the housing 1 are each provided with a second elastic part 142. By providing a first dustproof part 131 in the connecting groove 112 and an independent second dustproof part 132 in each gear groove 111, and by configuring a first elastic part 141 and multiple second elastic parts 142 respectively, the first dustproof part 131 and the second dustproof part 132 can cover the corresponding groove opening under the elastic action, thereby achieving segmented dynamic sealing of the entire gear area. No matter which gear the height adjustment lever 12 is in, the unoccupied gear groove 111 and connecting groove 112 can be accurately covered by the corresponding first dustproof part 131 or second dustproof part 132, avoiding local exposure and the formation of pollution channels as much as possible. When the height adjustment lever 12 moves, it only pushes the first dustproof part 131 or second dustproof part 132 that is in contact with it, while the remaining first dustproof parts 131 and second dustproof parts 132 remain in place and do not participate in the movement. Therefore, the operating resistance of the height adjustment lever 12 is small and the sliding is smooth.

[0055] It should be noted that both the gear position groove 111 and the connecting groove 112 are connected to the receiving groove 103. The first dustproof part 131 and the second dustproof part 132 can enter the corresponding receiving groove 103 under the push of the height adjustment rod 12.

[0056] Multiple gear slots 111 and connecting slots 112 are arranged along the plane of the housing 1. The first dustproof part 131 slides along the plane of the housing 1, and the second dustproof part 132 slides along the plane of the housing 1. No additional space is required for installation and movement in the three-dimensional direction, which makes the height adjustment device structure of the entire garden tool more flat, adapts to the planar design requirements of the housing 1, and makes the processing and assembly of the planar structure easier.

[0057] The multiple gear slot grooves 111 are arranged in a straight line. The first dustproof part 131 and the second dustproof part 132, under the action of the first elastic part 141, tend to stay close to each other and fit together to close the gear slot 11. This creates a continuous, closed protective surface that covers the entire gear slot 11, preventing dust, grass clippings, and water stains from entering through the joint between the connecting groove 112 and the gear slots 111. Both the first dustproof part 131 and the second dustproof part 132 have a first position and a second position.

[0058] Correspondingly, the connecting grooves 112 are arranged in a straight line. In this application, a first dustproof part 131 is provided. The first dustproof part 131 needs to cover the entire length of the connecting groove 112, so its own length is relatively large. In order to ensure that the single long strip first dustproof part 131 is subjected to uniform force during movement and does not deform or tilt, multiple first elastic parts 141 are provided between the first dustproof part 131 and the housing 1 to achieve multi-point support and uniform force application, effectively ensuring that the first dustproof part 131 slides smoothly and resets quickly throughout the entire movement stroke, and keeps in contact with the adjacent second dustproof part 132 as much as possible, thereby improving the sealing reliability and the stability of the device operation.

[0059] The mounting notch 104 contains a connecting seat 105 for connection with the connecting lug 153. When the first dustproof part 131 and the second dustproof part 132 approach and fit together under the action of the first elastic part 141 and the second dustproof part 132, they together close the stop groove 11. At this time, the first dustproof part 131 directly abuts against one side of the connecting seat 105, while the two ends of the second dustproof part 132 have an L-shaped bending structure, forming a stop part 134, which abuts against the connecting seat 105 from the other side. Thus, the connecting seat 105 simultaneously restricts the maximum travel of the first dustproof part 131 and the second dustproof part 132. When the height adjustment rod 12 is inserted and pushes the first dustproof part 131 to move, the second dustproof part 132 may cause unnecessary displacement due to its support from the first dustproof part 131 under the action of elastic force or inertia. At this time, the connecting seat 105, in cooperation with the stop portion 134 of the second dustproof part 132, together with the stop rib 102, restricts the maximum range of movement of the second dustproof part 132, preventing it from moving into the movement path of the height adjustment rod 12 as much as possible. Moreover, the L-shaped structure arranges the limiting contact point outside the contact area of ​​the first dustproof part 131 and the second dustproof part 132, ensuring that the limiting function does not affect the sealing surface between the first dustproof part 131 and the second dustproof part 132, and ensuring a tight fit in the closed state.

[0060] To minimize the impact on the movement of the height adjustment lever 12, the first elastic part 141 is located on the side of the first dustproof part 131 away from the height adjustment lever 12, and the second elastic part 142 is located on the side of the second dustproof part 132 away from the height adjustment lever 12. That is, the receiving groove 103 is located on the side away from the height adjustment lever 12, so that the installation positions of the first elastic part 141 and the second elastic part 142 avoid the movement path of the height adjustment lever 12. When the height adjustment lever 12 pushes the first dustproof part 131 and the second dustproof part 132 to slide and avoid each other, the first elastic part 141 and the second elastic part 142 will not interfere with the height adjustment lever 12, ensuring smooth movement.

[0061] When using, such as Figure 6 and Figure 7 The height adjustment lever 12 is located in the current gear position groove 111. At this time, the first dustproof part 131 and the second dustproof part 132 fit together to close the gear position groove 11, and then... Figure 8 and Figure 9 As shown, the height adjustment lever 12 is moved, and the lever 12 enters the connecting groove 112 and pushes the first dustproof part 131. At this time, the second dustproof part 132 of the current gear position groove 111 is reset under the push of the second elastic part 142 to cover the current gear position groove 111. Then, as shown... Figure 10 and Figure 11As shown, the height adjustment lever 12 moves into the gear position groove 111 of the preset gear position, pushing the second dustproof part 132 where the gear position groove 111 of the preset gear position is located. At this time, the first dustproof part 131 is reset under the elastic force of the first elastic part 141 to block the connecting groove 112.

[0062] It should be noted that the height adjustment device for garden tools in this application is mainly used for garden tools such as lawnmowers to adjust the working height of the blades relative to the ground. The height adjustment lever 12, as an operating component, can be connected to the blade disc via a transmission mechanism to transmit changes in the position of the height adjustment lever 12 to the blade disc. The blades are mounted on the blade disc, thereby adjusting the height of the blades above the ground.

[0063] Specifically, in one embodiment, the transmission mechanism is a linkage mechanism, including a rocker arm. The middle part of the rocker arm is hinged to the housing 1 via a pivot, forming a lever structure. One end of the height adjustment rod 12 extends into the housing 1 and is fixedly connected to one end of the rocker arm. The other end of the rocker arm is hinged to the cutter head mounting bracket. When the user pushes the height adjustment rod 12 to slide in the gear slot 11 and switch to different gears, the height adjustment rod 12 drives the rocker arm to rotate around its central pivot, thereby pulling the cutter head mounting bracket and causing the cutter head to rotate around its connecting shaft to the housing 1, realizing multi-level adjustment of the blade height. Each gear corresponds to a specific rocker arm angle and cutter head position. After the height adjustment rod 12 is engaged in the corresponding gear slot 111, a stable mechanical locking state is formed, ensuring that the cutter head maintains a constant set height during operation.

[0064] In other embodiments, the transmission mechanism may also adopt a lifting arm, a four-bar linkage, a slider guide rail structure, or a gear and rack mechanism, etc., as long as the linear displacement of the height adjustment rod can be converted into the height adjustment of the cutter head and multi-level positioning can be achieved, they all fall within the protection scope of this application.

[0065] Understandably, in other embodiments, the dust cover can be designed as an independent, one-piece component, including a rigid part and a flexible part. The flexible part is located on the side near the gear slot groove. The height adjustment rod contacts the flexible part and is located between the flexible part and the housing. The rigid part is slidably connected to the housing and automatically resets under the elastic force of the elastic element, allowing the entire dust cover to move to the position covering the gear slot. At this time, the flexible part is in a naturally extended state, covering each gear slot groove to achieve a dustproof seal. When the height needs to be adjusted, the height adjustment rod is moved. The height adjustment rod first squeezes the flexible part, causing it to deform locally, thereby making room for the connecting groove, allowing the height adjustment rod to enter the target gear slot groove. During this process, the flexible part only deforms and avoids deformation in the contact area, while the remaining un-squeezed parts remain closed, continuously blocking other gear slot grooves to ensure that the dustproof effect is not interrupted. After the height adjustment rod enters the new gear slot groove, the flexible part corresponding to the original gear loses pressure and recovers through its own elasticity, reclosing the gear slot groove; at the same time, the entire dust cover remains in contact with the housing under the action of the elastic element, ensuring structural stability and continuous sealing.

[0066] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A height adjustment device for a garden tool, comprising a housing (1) and a height adjustment rod (12), wherein the housing (1) is provided with a stop groove (11) for the height adjustment rod (12) to extend partially out of the housing (1), characterized in that, The housing (1) is also provided with a dustproof plate (13), which is slidably disposed on the housing (1). An elastic element (14) is provided between the dustproof plate (13) and the housing (1). Under the elastic force of the elastic element (14), the dustproof plate (13) tends to keep blocking the gear slot (11). When the height adjustment rod (12) moves relative to the housing (1) to switch gears, the height adjustment rod (12) pushes the dustproof plate (13) to slide and avoid it.

2. The height adjustment device for garden tools according to claim 1, characterized in that, The gear slot (11) includes multiple gear grooves (111) and a connecting groove (112) connecting the multiple gear grooves (111). The dustproof plate (13) includes a first dustproof part (131) slidably disposed in the connecting groove (112) and multiple second dustproof parts (132). Each second dustproof part (132) is slidably disposed in a gear groove (111). The elastic member (14) includes a first elastic part (141) disposed between the first dustproof part (131) and the housing (1) and multiple second elastic parts (142). Each second dustproof part (132) and the housing (1) are each provided with a second elastic part (142).

3. The height adjustment device for garden tools according to claim 2, characterized in that, The first dustproof part (131) and the second dustproof part (132) tend to stay close to each other and fit together to jointly close the gear slot (11) under the action of the first elastic part (141) and the second dustproof part (132).

4. The height adjustment device for garden tools according to claim 2, characterized in that, Multiple gear slots (111) and connecting slots (112) are arranged along the plane of the housing (1), the first dustproof part (131) slides along the plane of the housing (1), and the second dustproof part (132) slides along the plane of the housing (1).

5. The height adjustment device for garden tools according to claim 2, characterized in that, The first elastic part (141) is located on the side of the first dustproof part (131) away from the height adjustment rod (12), and the second elastic part (142) is located on the side of the second dustproof part (132) away from the height adjustment rod (12).

6. The height adjustment device for garden tools according to claim 1, characterized in that, The dustproof plate (13) is provided with guide ribs (133), the housing (1) is provided with guide grooves (101) that slide with the guide ribs (133), and the housing (1) is provided with stop ribs (102). The stop ribs (102) are used to stop the guide ribs (133) when the dustproof plate (13) is blocking the gear slot (11).

7. The height adjustment device for garden tools according to claim 1, characterized in that, The housing (1) is also provided with a receiving groove (103) communicating with the gear slot (11). The elastic element (14) is located in the receiving groove (103). The dustproof plate (13) has a first position where it is pushed into the gear slot (11) by the elastic element (14) and a second position where it is pushed into the receiving groove (103) by the height adjustment rod (12).

8. The height adjustment device for garden tools according to claim 7, characterized in that, The height adjustment device of the garden tool also includes a cover plate (15), which is installed on the housing (1) and closes the receiving groove (103). The cover plate (15) is provided with a clearance groove (151), which is connected to the gear groove (11) so that the height adjustment rod (12) can pass through and slide in the gear groove (11).

9. The height adjustment device for garden tools according to claim 8, characterized in that, The dustproof plate (13) is located between the cover plate (15) and the housing (1).

10. The height adjustment device for garden tools according to claim 8, characterized in that, The gear slots (11) are arranged in a straight line along the surface of the housing (1) in the same plane, and the cover plate (15) and the dustproof plate (13) are both flat plate structures.

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