One-handed adjustment mechanism for a lawnmower
By designing a one-handed adjustment mechanism, utilizing the cooperation of connecting rods and locking components, combined with a booster spring and guide structure, the problem of complex height adjustment operation of lawnmowers is solved, achieving convenient, labor-saving, and precise height adjustment with one hand.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU CREATE ELECTRIC APPLIANCE
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-29
Smart Images
Figure CN224290734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of garden tool technology, specifically an adjustment mechanism for adjusting the height of a lawnmower that can be operated with one hand. Background Technology
[0002] Electric lawnmowers are common gardening tools, allowing for adjustable cutting heights to meet specific needs. Chinese patent document CN208113348U discloses a push-type lawnmower with adjustable cutting height, comprising a frame, several wheels on both sides of the frame, a cutting mechanism mounted at the bottom of the frame, and a push handle connected to the frame. A height adjustment device is provided on one side of the frame; the device includes an adjustment rod rotatably mounted on the frame, an adjustment crossbar inserted into the frame and rotatably connected to the adjustment rod, and a limiting mechanism for restricting the rotation of the adjustment rod; several turntables corresponding to the wheels are rotatably mounted on the adjustment crossbar, and the turntables are rotatably connected to the wheels via rotating shafts. When the lawnmower needs to adjust the cutting height, press down on the height adjustment handle 531. The return spring 5321 is compressed, causing the limit block 534 to disengage from the limit groove 5331. Then, rotate the adjustment rod 51. The adjustment rod 51 drives the adjustment crossbar 52 to rotate around the connection point between the adjustment rod 51 and the frame 1. The turntable 54 rotates around the shaft 6 under the influence of the adjustment crossbar 52. When the frame 1 is adjusted to the desired height, stop rotating the adjustment rod 51 and release the height adjustment handle 531. The restoring force of the return spring 5321 forces the height adjustment handle 531 to reset, and the limit block 534 re-engages in the limit groove 5331, so that the frame 1 and the adjustment crossbar 52 are at the set height, thus achieving the adjustment of the cutting height. This structure is not easy to operate. Unlocking requires pressing down on the height adjustment handle 531, and then rotating it to adjust the height can easily cause conflicts with the force required to raise the height. It is necessary to control the force of the lawnmower height adjustment separately, making it difficult to control the height adjustment. Utility Model Content
[0003] The purpose of this invention is to provide a simple and easy-to-operate one-hand adjustment mechanism for a lawnmower.
[0004] The basic technical solution for achieving the purpose of this utility model is: a single-hand adjustment mechanism for a lawnmower, comprising a front wheel assembly, a rear wheel assembly, and a connecting rod. The front wheel assembly includes a front wheel, a front wheel adjusting shaft, and a front wheel mounting plate, with the front wheel eccentrically positioned with respect to the front wheel adjusting shaft via the mounting plate. The rear wheel assembly includes a rear wheel, a rear wheel adjusting shaft, and a rear wheel mounting plate, with the rear wheel eccentrically positioned with respect to the rear wheel adjusting shaft via the mounting plate. Its structural feature is that it also includes a positioning seat and a locking assembly.
[0005] The connecting rod is a single unit, comprising a connecting rod section and a handle. The front end of the connecting rod section is rotatably mounted on the right-side front wheel mounting plate, its axis of rotation forming a triangle with the axis of rotation of the front wheel and the axis of adjustment of the front wheel. The rear end of the connecting rod section is rotatably mounted on the corresponding right-side rear wheel mounting plate, its axis of rotation also forming a triangle with the axis of rotation of the rear wheel and the axis of adjustment of the rear wheel. The connecting rod is operated in the forward / backward and up / down directions via the handle. The positioning seat is fixedly mounted on the lawnmower housing. The locking assembly includes an unlock button and a locking plate. The unlock button is located in the handle, and the locking plate is located in the connecting rod section, with a locking pin on the locking plate. By operating the unlock button in the up / down direction, the locking pin moves horizontally and engages with the positioning seat to lock or unlock.
[0006] Furthermore, in order to achieve mutual cooperation, a set of positioning holes are provided on the positioning seat.
[0007] The unlock button has an unlock guide at its lower part. The unlock guide is tilted to the left at the top and to the right at the bottom. The front end of the locking plate is rotatably mounted in the connecting rod, with its rotation axis set vertically. The front of the locking plate has a guide hole, and the corresponding part of the unlock guide of the unlock button is located in the guide hole. When the unlock button moves upward, the unlock guide drives the rear part of the locking plate to rotate to the right. The locking pin is inserted into a corresponding positioning hole on the positioning seat, thereby fixing the connecting rod at that height position.
[0008] Furthermore, to facilitate insertion: the positioning holes are elongated oval holes, and each positioning hole is arranged parallel to each other from front to back.
[0009] Furthermore, to enhance labor-saving capabilities, a power-assist spring is also included, with one end of the power-assist spring fixedly mounted on the housing and the other end fixedly mounted on the connecting rod.
[0010] Furthermore, in order to control and adjust the height: the lawnmower housing is equipped with height indicator arrows, and the front of the connecting rod is equipped with a height scale along the front and back directions.
[0011] Furthermore, to ensure proper fit, the connecting rod also includes a guide section. The guide section has a downward-opening guide groove running through its front and rear, with the corresponding part of the positioning seat located within the guide groove.
[0012] The present invention has the following beneficial effects: (1) The single-hand adjustment mechanism of the lawnmower of the present invention has a simple structure and can be operated with one hand. While holding the unlock button, the hand is tightly holding the handle, so the height can be adjusted by lifting or pressing down as needed, which is easy to operate. That is, by operating the linkage in the front-back and up-down directions by the handle, and by operating the unlock button in the up-down direction, the locking pin moves in the horizontal plane and cooperates with the positioning seat to lock or unlock. The forces between them will not interfere during operation, which is easy to control. (2) The single-hand adjustment mechanism of the lawnmower of the present invention has a height scale, which makes the adjustment more intuitive and thus more accurate and faster. (3) The single-hand adjustment mechanism of the lawnmower of the present invention has a booster spring, which provides a booster when raising the lawnmower, making the lifting operation more effortless. (4) The positioning seat of the single-hand adjustment mechanism of the lawnmower of the present invention is slidably set in the guide part of the linkage, which serves as a guide when adjusting in the front and back, and ensures the reliability of the connection between the locking pin and the positioning plate. (5) The positioning hole of the positioning seat of this utility model is an elongated hole arranged in the vertical direction, which facilitates insertion. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of a lawnmower with the single-hand adjustment mechanism of this invention in its lowest position.
[0014] Figure 2 for Figure 1 A diagram showing the view from the right.
[0015] Figure 3 for Figure 1 A top-down view.
[0016] Figure 4 From Figure 1 A diagram showing the view from the upper left front.
[0017] Figure 5 This is a schematic diagram of a lawnmower with the single-hand adjustment mechanism of this invention in its highest position.
[0018] Figure 6 From Figure 1 This is a schematic diagram showing the adjustment mechanism in its lowest position when viewed from the left.
[0019] Figure 7 From Figure 1 This is a schematic diagram showing the adjustment mechanism in its lowest position when viewed from the lower left rear.
[0020] Figure 8 From Figure 1 This is a schematic diagram showing the adjustment mechanism in its lowest position when viewed from the upper left front.
[0021] Figure 9From Figure 1 This is a schematic diagram showing the adjustment mechanism at its highest position when viewed from the left.
[0022] Figure 10 From Figure 1 This is a diagram showing the adjustment mechanism at its highest position when viewed from the upper left front.
[0023] Figure 11 This is a schematic diagram of the connecting rod.
[0024] Figure 12 This is a structural diagram of the locking component.
[0025] Figure 13 This is a schematic diagram of the linkage and locking assembly in Example 2.
[0026] Figure 14 This is a schematic diagram of the locking component in Embodiment 2.
[0027] The labels in the attached diagram are:
[0028] Front wheel assembly 1, front wheel 1-1, front wheel adjusting axle 1-2, front wheel mounting plate 1-3,
[0029] Rear wheel assembly 2, rear wheel 2-1, rear wheel adjusting axle 2-2, rear wheel mounting plate 2-3,
[0030] Linkage 3, Linkage section 3-1, Pin hole 3-11, Height scale 3-12, Handle 3-2, Button hole 3-21, Guide section 3-3, Guide groove 3-31.
[0031] Positioning seat 4, positioning hole 4-1,
[0032] Locking component 5, unlocking button 5-1, unlocking guide 5-11, locking plate 5-2, guide hole 5-21, spring groove 5-22, pin hole 5-23, positioning pin 5-24, locking plate return spring 5-25.
[0033] Assist spring 6,
[0034] Casing 10, height marking arrow 10-1. Detailed Implementation
[0035] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. The description of the orientation of this utility model is as follows: Figure 1 Proceeding in the indicated direction, that is Figure 1 The up, down, left, and right directions shown are the same as the directions described. Figure 1 The direction the lawnmower is facing is considered forward (i.e., the direction it is moving forward), and the direction it is facing away from is considered forward. Figure 1The side to the left is the rear. The terms "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model or simplifying the description, not to indicate a specific orientation that must be present. In the description of this utility model, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] (Example 1)
[0037] See Figures 1 to 12 The single-hand adjustment mechanism of the lawnmower of this utility model includes a front wheel assembly 1, a rear wheel assembly 2, a connecting rod 3, a positioning seat 4, a locking assembly 5, and a booster spring 6. The lawnmower housing 10 is provided with a height indicator arrow 10-1.
[0038] The front wheel assembly 1 includes a front wheel 1-1, a front wheel adjusting shaft 1-2, and a front wheel mounting plate 1-3. There are two front wheels 1-1 and two front wheel mounting plates 1-3. The two front wheel mounting plates 1-3 are fixedly mounted on the left and right ends of the front wheel adjusting shaft 1-2, respectively, and the front wheel adjusting shaft 1-2 is rotatably mounted on the front part of the housing 10. The two front wheels 1-1 are rotatably mounted on their respective front wheel mounting plates 1-3, and the two front wheels 1-1 are coaxially arranged, with the front wheels 1-1 and the front wheel adjusting shaft 1-2 being eccentrically positioned.
[0039] The rear wheel assembly 2 includes a rear wheel 2-1, a rear wheel adjusting shaft 2-2, and a rear wheel mounting plate 2-3. There are two rear wheels 2-1 and two rear wheel mounting plates 2-3. The two rear wheel mounting plates 2-3 are fixedly mounted on the left and right ends of the rear wheel adjusting shaft 2-2, which is rotatably mounted on the rear part of the housing 10. The two rear wheels 2-1 are rotatably mounted on their respective rear wheel mounting plates 2-3, and are coaxially arranged, with the rear wheels 2-1 and the rear wheel adjusting shaft 2-2 being eccentrically positioned.
[0040] The connecting rod 3 is a single piece, comprising a connecting rod portion 3-1, a handle 3-2, and a guide portion 3-3. The connecting rod portion 3-1 has a mounting cavity in its middle, and a pin hole 3-11 communicating with the mounting cavity is located on the upper left side of the connecting rod portion 3-1. A height scale 3-12 is located on the front of the connecting rod portion 3-1 along the front-rear direction. A height indicator arrow 10-1 works in conjunction with the height scale 3-12 to indicate the height of the grass after mowing. The handle 3-2 is located on the middle of the connecting rod portion 3-1. The upper and front parts of the handle 3-2 have mounting cavities that communicate with the mounting cavities of the connecting rod portion 3-1. A button hole 3-21 communicating with its mounting cavity is located on the upper part of the handle 3-2. The guide portion 3-3 is located on the middle of the connecting rod portion 3-1, extending to the left, and has a downward-opening guide groove 3-31 that runs through its front and rear.
[0041] The front end of the connecting rod 3-1 is rotatably mounted on the front wheel mounting plate 1-3 located on the right side, and its rotation axis is arranged in a triangle with the rotation axis of the front wheel 1-1 and the axis of the front wheel adjusting shaft 1-2. The rear end of the connecting rod 3-1 is rotatably mounted on the corresponding rear wheel mounting plate 2-3 located on the right side, and its rotation axis is arranged in a triangle with the rotation axis of the rear wheel 2-1 and the axis of the rear wheel adjusting shaft 2-2. Thus, by adjusting the vertical distance between the rotation axis of the front wheel 1-1 and the front wheel adjusting shaft 1-2 via the connecting rod 3, and by adjusting the vertical distance between the rotation axis of the rear wheel 2-1 and the rear wheel adjusting shaft 2-2 via the connecting rod 3, the height of the housing 10 is changed, thereby adjusting the height of the lawnmower.
[0042] The positioning seat 4 is fixedly mounted on the housing 10, and the positioning seat 4 is provided with a set of positioning holes 4-1. The positioning holes 4-1 are elongated holes arranged vertically, and the positioning holes 4-1 are arranged parallel to each other from front to back. The corresponding part of the positioning seat 4 is located in the guide groove 3-31 of the guide part 3-3.
[0043] The locking assembly 5 includes an unlocking button 5-1 and a locking plate 5-2. The unlocking button 5-1 is slidably disposed in the mounting cavity of the handle 3-2 along the vertical direction, with the corresponding part located in the button hole 3-21. A button return spring is provided between the upper part of the unlocking button 5-1 and the handle 3-2 for resetting the unlocking button 5-1 by moving it downward. An unlocking guide part 5-11 is provided at the lower part of the unlocking button 5-1. The unlocking guide part 5-11 is inclined to the left at the top and to the right at the bottom.
[0044] The front end of the locking plate 5-2 is rotatably mounted in the mounting cavity of the connecting rod portion 3-1, with its rotation axis arranged vertically. The front of the locking plate 5-2 has a guide hole 5-21, and the corresponding part of the unlocking guide portion 5-11 of the unlocking button 5-1 is located in this guide hole 5-21. When the unlocking button 5-1 moves upward, the unlocking guide portion 5-11 drives the rear of the locking plate 5-2 to rotate to the right. The rear of the locking plate 5-2 has a spring groove 5-22 opening to the right. A locking plate return spring 5-25 is located in the spring groove 5-22, extending outward from the spring groove 5-22. The locking plate return spring 5-25 generates a force that causes the rear of the locking plate 5-2 to rotate to the left, so that when the unlocking button 5-1 is released, the rear of the locking plate 5-2 rotates to the left to reset. The rear part of the locking plate 5-2 is provided with a pin hole 5-23 with an opening to the left. A locking pin 5-24 is provided in the pin hole 5-23. After the locking pin 5-24 extends to the left from the pin hole 3-11 of the connecting rod part 3-1, it extends into a corresponding positioning hole 4-1 on the positioning seat 4, thereby fixing the connecting rod 3 in this position and completing the locking after height adjustment.
[0045] One end of the auxiliary spring 6 is fixedly mounted on the housing 10, and the other end is fixedly mounted on the connecting rod 3. It is used to generate a force that pulls the connecting rod 3 backward, that is, to generate an auxiliary assisting effect when the connecting rod 3 is pulled backward to adjust the height.
[0046] When using the single-hand adjustment mechanism of this utility model lawnmower, starting from the lowest position, first grasp the handle 3-2 of the connecting rod 3, and simultaneously press the unlock button 5-1 upwards with your finger. The unlock button 5-1 moves upwards, and its lower unlock guide part 5-11 moves upwards, simultaneously driving the locking plate 5-2 to rotate its rear part to the right. This causes the locking pin 5-24, which is inserted into the first positioning hole 4-1 at the front of the positioning seat 4 (i.e., the lowest mowing position of the lawnmower), to disengage from the positioning hole 4-1. Then, by pressing the handle 3-2... Lift the housing 10 upwards and backwards. At the same time, the force generated by the contraction of the assist spring 6 also assists the housing 10 to move backwards. When the height is adjusted to the required height as indicated by the height indicator arrow 10-1, release the unlock button 5-1. The unlock button 5-1 is driven to move downwards and reset under the action of the button reset spring. At the same time, the locking plate reset spring 5-25 drives the locking plate 5-2 to rotate to the left and reset, so that the locking pin 5-24 is inserted into the corresponding positioning hole 4-1 on the positioning seat 4, thereby keeping the lawnmower housing 10 at that height.
[0047] (Example 2)
[0048] See Figure 13 and Figure 14 The rest of this embodiment is the same as that in Embodiment 1, except that the locking plate 5-2 is slidably disposed in the mounting cavity of the connecting rod 3-1 in the left-right direction, which helps to improve the smoothness of operation. When adjusting from the lowest position, first hold the handle 3-2 of the connecting rod 3, and at the same time press the unlocking button 5-1 upward with your finger. The unlocking button 5-1 moves upward, and at the same time, the unlocking guide part 5-11 at its lower part moves upward, driving the locking plate 5-2 to slide to the right, thereby causing the locking pin 5-24 inserted into the first positioning hole 4-1 at the frontmost position of the positioning seat 4 (that is, the lowest position of the lawnmower) to exit the positioning hole 4-1; then lift the housing 10 upward and backward by using the handle 3-2. At the same time, the force generated by the contraction of the assist spring 6 also assists the housing 10 to move backward. When the height is adjusted to the required height according to the height indicator arrow 10-1, the unlock button 5-1 is released. Under the action of the button reset spring, the unlock button 5-1 is driven to move downward to reset. At the same time, the locking plate reset spring 5-25 drives the locking plate 5-2 to slide to the left to reset the locking plate 5-2, so that the locking pin 5-24 is inserted into the corresponding positioning hole 4-1 on the positioning seat 4, thereby keeping the lawnmower housing 10 at that height.
[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A single-hand adjustment mechanism for a lawnmower, comprising a front wheel assembly (1), a rear wheel assembly (2), and a connecting rod (3); the front wheel assembly (1) includes a front wheel (1-1), a front wheel adjusting shaft (1-2), and a front wheel mounting plate (1-3), the front wheel (1-1) being eccentrically positioned with respect to the front wheel adjusting shaft (1-2) via the front wheel mounting plate (1-3); the rear wheel assembly (2) includes a rear wheel (2-1), a rear wheel adjusting shaft (2-2), and a rear wheel mounting plate (2-3); the rear wheel (2-1) being eccentrically positioned with respect to the rear wheel adjusting shaft (2-2) via the rear wheel mounting plate (2-3); characterized in that: It also includes a positioning base (4) and a locking component (5); The connecting rod (3) is a single piece, comprising a connecting rod part (3-1) and a handle (3-2); the front end of the connecting rod part (3-1) is rotatably mounted on the front wheel mounting plate (1-3) located on the right side, and its rotation axis is triangularly distributed with the rotation axis of the front wheel (1-1) and the axis of the front wheel adjusting shaft (1-2); the rear end of the connecting rod part (3-1) is rotatably mounted on the corresponding rear wheel mounting plate (2-3) located on the right side, and its rotation axis is triangularly distributed with the rotation axis of the rear wheel (2-1) and the axis of the rear wheel adjusting shaft (2-2); the handle (3-2) is connected to the handle (3-1) to the handle (3-2). -2) The linkage (3) is operated in the front-back and up-down directions; the positioning seat (4) is fixedly installed on the housing (10) of the lawnmower; the locking assembly (5) includes an unlock button (5-1) and a locking plate (5-2); the unlock button (5-1) is located in the handle (3-2), the locking plate (5-2) is located in the linkage (3-1), and the locking plate (5-2) is provided with a locking pin (5-24); by operating the unlock button (5-1) in the up-down direction, the locking pin (5-24) moves in the horizontal plane and cooperates with the positioning seat (4) to lock or unlock.
2. The single-hand adjustment mechanism for the lawnmower according to claim 1, characterized in that: The positioning seat (4) is provided with a set of positioning holes (4-1); The unlocking button (5-1) has an unlocking guide (5-11) at its lower part; the unlocking guide (5-11) is tilted to the left at the top and to the right at the bottom; the front end of the locking plate (5-2) is rotatably set in the connecting rod (3-1), and its rotation axis is set along the vertical direction; the front part of the locking plate (5-2) has a guide hole (5-21), and the corresponding part of the unlocking guide (5-11) of the unlocking button (5-1) is located in the guide hole (5-21). When the unlocking button (5-1) moves upward, the unlocking guide (5-11) drives the rear part of the locking plate (5-2) to rotate to the right; the locking pin (5-24) is inserted into a corresponding positioning hole (4-1) on the positioning seat (4), thereby fixing the connecting rod (3).
3. The single-hand adjustment mechanism for the lawnmower according to claim 1, characterized in that: The positioning seat (4) is provided with a set of positioning holes (4-1); The unlocking button (5-1) has an unlocking guide (5-11) at its lower part; the unlocking guide (5-11) is tilted to the left at the top and to the right at the bottom; the locking plate (5-2) is slidably disposed in the mounting cavity of the connecting rod (3-1) along the left and right directions; the front of the locking plate (5-2) has a guide hole (5-21), and the corresponding part of the unlocking guide (5-11) of the unlocking button (5-1) is located in the guide hole (5-21). When the unlocking button (5-1) moves upward, the unlocking guide (5-11) drives the locking plate (5-2) to slide to the left; the locking pin (5-24) is inserted into a corresponding positioning hole (4-1) on the positioning seat (4) to fix the connecting rod (3).
4. The single-hand adjustment mechanism for a lawnmower according to claim 2 or 3, characterized in that: The positioning holes (4-1) are elongated oval holes, and each positioning hole (4-1) is arranged parallel to each other from front to back.
5. The single-hand adjustment mechanism for the lawnmower according to claim 1, characterized in that: It also includes a booster spring (6), one end of which is fixedly mounted on the housing (10), and the other end is fixedly mounted on the connecting rod (3).
6. The single-hand adjustment mechanism for the lawnmower according to claim 1, characterized in that: The lawnmower housing (10) has a height indicator arrow (10-1), and the front of the connecting rod (3-1) has a height scale (3-12) along the front and back directions.
7. The single-hand adjustment mechanism for the lawnmower according to claim 1, characterized in that: The connecting rod (3) also includes a guide section (3-3); the guide section (3-3) is provided with a guide groove (3-31) that opens downward and runs through its front and back, and the corresponding part of the positioning seat (4) is located in the guide groove (3-31) of the guide section (3-3).