Cutting height adjustment mechanism of lawn mower

Abstract

The present invention relates to a cutting height adjustment mechanism of a lawn mower, comprising a connecting rod and a shift plate, wherein the shift plate has a plurality of shift slots, one end of the connecting rod is rotatably connected to the shift plate, and the other end of the connecting rod is connected to a front wheel axle assembly; a rotating member, which is pivotally connected to a casing and fixed with a limit pin; a handle, which is used for a user to operate to raise or lower the height of the casing; an unlocking member, which has an unlocking position and a locking position, in which the handle can raise or lower the height of the casing, and in the locking position, the height of the casing remains fixed; a height adjustment rod, wherein one end of the height adjustment rod is pivotally connected to the rotating member; the other end of the height adjustment rod is connected to the unlocking member; the unlocking member can be operated to move relative to the handle to drive the height adjustment rod and drive the rotating member to rotate, so that when the limit pin is engaged with or disengaged from the gear slot, the force of the entire machine acting on the limit pin is dispersed to the casing through the rotating member, and the limit pin can be reliably locked in the gear slot.

Description

Technical Field

[0001] The invention relates to the field of garden tools, in particular to a cutting height adjustment mechanism of a lawn mower. Background Art

[0002] Garden tools such as hand-push electric lawn mowers usually have a cutting height adjustment mechanism to meet the need for operating height adjustment. The current cutting height adjustment mechanism usually uses a handle to drive the height adjustment rod to move, and relies on the limit pin on the height adjustment rod to lock with different gear slots to achieve height adjustment. However, in the above height adjustment scheme, the gravity of the tool is concentrated on the limit pin, which makes the height adjustment rod subject to greater force, which affects the strength and positioning reliability of the height adjustment rod. Summary of the invention

[0003] Based on this, it is necessary to provide a cutting height adjustment mechanism for a garden mower that can improve positioning reliability.

[0004] A cutting height adjustment mechanism for a lawn mower, the lawn mower comprising a housing and running wheels for supporting the housing, the running wheels comprising a front wheel and a rear wheel, the cutting height adjustment mechanism comprising:

[0005] A lifting connection member, the lifting connection member includes a connecting rod and a shift plate, the shift plate has a plurality of shift slots, one end of the connecting rod is rotatably connected to the shift plate, the other end of the connecting rod is connected to a front wheel axle assembly, the shift plate is fixedly connected to a rear wheel axle assembly, a rotating shaft is further provided on the shift plate, the shift plate is rotatably connected to the housing via the rotating shaft, and the front wheel axle assembly and the rear wheel axle assembly are respectively connected to the front wheel and the rear wheel;

[0006] A handle fixed to the housing, for a user to operate to raise or lower the height of the housing;

[0007] An unlocking member, operably disposed on the handle;

[0008] A rotating member, the rotating member is pivotally connected to the housing via a rotating shaft, and a limiting pin is fixed on the rotating member;

[0009] A height-adjusting rod, one end of which is pivotally connected to the rotating member; the other end of the height-adjusting rod is connected to the unlocking member; the unlocking member can be operated to move relative to the handle to drive the height-adjusting rod and drive the rotating member to rotate, so that the limit pin is engaged or disengaged from the gear slot.

[0010] In the above-mentioned height adjustment structure, the limit pin is arranged on the rotating part, the rotating part is pivotally connected to the casing of the lawn mower, and the unlocking part is linked to the rotating part. When the unlocking part is operated, the rotating part is driven to rotate. When the rotating part rotates, it can drive the limit pin to engage or disengage with the gear slot. When the limit pin is engaged with the gear slot, the force of the whole machine acting on the limit pin is dispersed to the casing through the rotating part, so that the limit pin can be reliably locked in the gear slot, reducing the force on the height adjustment rod and avoiding the positioning difficulty caused by it.

[0011] In one embodiment, the height adjustment rod is rotatably connected to the handle via a rotating shaft, and the height adjustment rod is pivotally connected to the rotating member via a connecting shaft. When the unlocking member is operated, the height adjustment rod is driven to rotate around the rotating shaft, and when the height adjustment rod rotates, the rotating member is driven to rotate.

[0012] In one embodiment, the line connecting the centers of the rotating shaft, the limiting pin and the connecting shaft is in the shape of a triangle.

[0013] In one embodiment, the unlocking member is fixedly disposed on the height-adjusting rod and protrudes from the handle.

[0014] In one of the embodiments, it further includes an elastic return member, which is configured to provide an elastic force to lock the limit pin in the shift groove.

[0015] In one embodiment, two ends of the elastic return member are respectively connected to the rotating member and the housing.

[0016] In one of the embodiments, in the height direction of the housing, the opening of the gear slot faces upward, and the height adjustment rod is provided with a through hole, through which the limit pin passes, and the limit pin and the through hole have a gap. When the limit pin is engaged in the gear slot, the limit pin is supported on the gear slot, and there is a gap between the height adjustment rod and the limit pin or it is supported on the limit pin.

[0017] In one embodiment, the unlocking member is configured to be pressable and to move upward relative to the housing when pressed, wherein when the limit pin is engaged in the gear slot, the unlocking member is pressed and the limit pin is driven by the height adjustment rod to move so as to disengage from the gear slot.

[0018] In one embodiment, a latch is provided on the handle, and the unlocking member has a latch slot selectively matched with the latch slot to limit the movement path of the height adjustment rod, wherein when the unlocking member is pressed, the latch enters the latch slot, and the limit pin disengages from the gear slot; when the unlocking member is released, the latch is separated from the latch slot, and the limit pin is engaged with the gear slot.

[0019] In one of the embodiments, the shift plate is further provided with a blocking portion located above the plurality of shift slots, an arc-shaped slot is formed between the blocking portion and the plurality of shift slots, and the plurality of shift slots are opened on the bottom wall of the arc-shaped slot and arranged in an arc shape.

[0020] In one embodiment, along the axial direction of the rotating shaft, limiting members are respectively provided on both sides of the rotating member, and the two limiting members abut against the rotating member along the axial direction of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front structural schematic diagram of a cutting height adjustment mechanism according to an embodiment of the present invention when a limit pin is engaged in a shift slot.

[0022] Figure 2 It is a schematic diagram of the back structure when the limit pin of the cutting height adjustment mechanism is engaged in the gear slot.

[0023] Figure 3 This is a schematic diagram of the structure when the cutting height adjustment mechanism is arranged on the housing of the lawn mower and the rear wheels are hidden.

[0024] Figure 4 This is a schematic diagram of the structure in which the cutting height adjustment mechanism is arranged on the housing of the lawn mower and the rear wheels are shown.

[0025] Figure 5 The schematic diagram of the structure of the gripping part is shown when the limit pin of the cutting height adjustment mechanism is engaged with the gear slot.

[0026] Figure 6 This is a schematic diagram of the front structure when the limit pin of the cutting height adjustment mechanism is out of the gear slot.

[0027] Figure 7 This is a schematic diagram of the back structure when the limit pin of the cutting height adjustment mechanism is out of the gear slot.

[0028] Figure 8 It is a schematic diagram of the structure of the gripping part when the limit pin of the cutting height adjustment mechanism is out of the gear slot.

[0029] Fig. 9 It is a front structural schematic diagram of another embodiment of the cutting height adjustment mechanism when the limit pin is engaged in the gear slot.

[0030] Fig.10 It is a partial structural schematic diagram of the back side of the cutting height adjustment mechanism of another embodiment, in which the lifting connection parts are omitted.

[0031] The relevant components in the figure are marked as follows:

[0032] 100, cutting height adjustment mechanism; 10, lifting connection; 11, gear plate; 111, gear slot; 112, blocking part; 113, arc slot; 12, connecting rod; 13, front wheel axle assembly; 14, rear wheel axle assembly; 141, rear wheel axle; 15, rotating shaft; 20, rotating part; 21, rotating shaft; 22, limiting pin; 23, connecting shaft; 30, height adjustment handle; 31, handle; 32, height adjustment rod; 321, driving part; 3211, through hole; 322, middle extension section; 323, top connecting section; 324, rotating shaft; 33, unlocking part; 331, slot; 34, elastic reset part; 35, gripping part; 351, clamping part; 1, casing; 2, walking wheel; 201, front wheel; 202 rear wheel; 3, armrest; 4, cutting assembly. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present invention more thoroughly and comprehensively.

[0034] It should be noted that when a part is referred to as being "fixed to" another part, it may be directly on the other part or there may be a central part. When a part is considered to be "connected" to another part, it may be directly connected to the other part or there may be a central part at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] In the description of the present invention, it is to be understood that the terms “length”, “width”, “thickness”, “height”, “depth”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] The preferred implementation of the cutting height adjustment mechanism of the lawn mower of the present invention will be described below in conjunction with the accompanying drawings.

[0038] Please refer to Figure 1 and Figure 2 , illustrates the structure of a cutting height adjustment mechanism 100 of a lawn mower according to an embodiment of the present invention. In the embodiment of the present invention, the garden tool is as follows Figure 3 and Figure 4 The electric lawn mower shown in the figure is used as an example to illustrate the structure of the cutting height adjustment mechanism 100 and its height adjustment principle. Figure 3 and Figure 4 The garden tool shown in the figure includes a housing 1 and a running wheel 2. A cutting assembly 4 is arranged below the housing 1. The running wheel 2 includes a front wheel 201 and a rear wheel 202. The front wheel 201 is arranged at the front end of the housing 1, and the rear wheel 202 is arranged at the rear end of the housing 1. In addition, a handrail 3 is also arranged at the rear end of the housing 1. When the garden tool is working, the user holds the handrail 3 to push the garden tool to walk. The front end refers to the end of the garden tool away from the user during normal operation, and the rear end refers to the end close to the user.

[0039] like Figure 1 and Figure 2 As shown, the cutting height adjustment mechanism 100 includes a lifting connection member 10, a rotating member 20 and a height adjustment handle 30. The lifting connection member 10 is rotatably connected to the walking wheel 2, and the lifting connection member 10 includes a shift plate 11, and the shift plate 11 has a plurality of shift slots 111. One end of the rotating member 20 is pivotally connected to the housing 1 through a rotating shaft 21, and the other end is fixed with a limit pin 22. The height adjustment handle 30 includes a handle 31 and a height adjustment rod 32, wherein the handle 31 is fixed to the housing 1, wherein the handle 31 is used for the user to operate to raise or lower the height of the housing 1, and the height adjustment rod 32 can be relatively movably arranged on the handle 31, and the height adjustment rod 32 can be operated to move relative to the housing 1 so that the limit pin 22 can be engaged with or disengaged from the shift slot 111.

[0040] In the specific setting, a rotating shaft 21 is fixed to one end of the rotating member 20, and the rotating shaft 21 is connected to the housing 1 through a bearing. The other end of the rotating member 20 is fixed with a limit pin 22 by welding. The height adjustment rod 32 is slidably connected to the handle 31, and the height adjustment rod 32 can be configured to be assembled with the handle 31 from one side of the handle 31, or configured to pass through the inside of the handle 31. One end of the height adjustment rod 32 is pivotally connected to the rotating member 20. The handle 31 can be fixed to any suitable position of the housing 1. The gear slot 111 is snap-fitted with the limit pin 22 to lock the gear plate 11. The gear slot 111 can be configured as a U-shaped slot, and the limit pin 22 can be a cylindrical pin.

[0041] The working principle of the cutting height adjustment mechanism 100 is as follows: Figure 1 and Figure 2As shown, the limit pin 22 on the rotating member 20 is engaged with one of the gear slots 111 to determine a mowing height. When the mowing height needs to be adjusted, the user moves the height adjustment rod 32 relative to the housing 1. The movement of the height adjustment rod 32 drives the rotating member 20 to rotate, so that the limit pin 22 is disengaged from the gear slot 111. Figures 6 to 8 As shown. At this time, the shift plate 11 is not locked by the height adjustment rod 32 and can rotate freely. Afterwards, the housing 1 is raised or lowered by the handle 31, and the housing 1 drives the shift plate 11 to rotate. When the mowing height is adjusted to the required height, the height adjustment rod 32 is reset, and the height adjustment rod 32 drives the rotating member 20 to rotate, so that the limit pin 22 enters another gear slot 111 and re-locks the shift plate 11. At this time, due to the change in the height of the housing 1 above the ground, the height of the cutting assembly 4 above the ground is changed, thereby completing the adjustment of the mowing height.

[0042] In the above-mentioned cutting height adjustment mechanism 100, the limit pin 22 is arranged on the rotating member 20, and the rotating member 20 is pivotally connected to the housing 1, so the limit pin can move to engage with or disengage from the gear slot 111. When the limit pin 22 is engaged with the gear slot 111, the force of the whole machine acting on the limit pin 22 is dispersed to the housing 1 through the rotating member 20, so that the limit pin 22 can be reliably locked in the gear slot 111.

[0043] The limit pin 22 is used for engaging and disengaging with the gear slot 111. As the main force-bearing component, it is easy to shake left and right. For this reason, in some embodiments, limit members (not shown) are provided on both sides of the rotating member 20, so that the rotating member 20 can only rotate around the rotating shaft 21, but will not shake in the axial direction of the rotating shaft 21. In the specific setting, a limit member can be provided on the gear plate 11 and the housing 1 respectively, and the two limit members abut the rotating member 20 along the axial direction of the rotating shaft 21 from both sides of the rotating member 20, thereby limiting the shaking of the rotating member 20 but allowing the rotating member 20 to rotate. Since the height adjustment rod 32 is linked with the rotating member 20, the shaking of the height adjustment rod 32 is also limited, making the height adjustment linkage structure more stable. In the traditional technology, the limit pin is directly set on the height adjustment rod, and the height adjustment rod needs to be limited. Since the height adjustment rod parts are long and extend to the height adjustment handle, the shaking gap is larger, resulting in an unreliable structure.

[0044] like Figure 1 and Figure 2As shown, the lifting connection member 10 includes a shift plate 11 and a connecting rod 12. One end of the connecting rod 12 is rotatably connected to the shift plate 11, and the other end of the connecting rod 12 is connected to a front wheel axle assembly 13. The shift plate 11 is fixedly connected to a rear wheel axle assembly 14. The shift plate 11 is also provided with a rotating shaft 15, and the shift plate 11 is rotatably connected to the housing 1 through the rotating shaft 15. The front wheel axle assembly 13 is used to install a front wheel 201. When specifically set, the front wheel axle assembly 13 can be set as a double crankshaft structure, and a front wheel 201 is installed at both ends. The rear wheel axle assembly 14 is used to install a rear wheel 202. When the limit pin 22 is disengaged from the shift slot 111, the shift plate 11 is not locked by the height adjustment rod 32, and the housing 1 is connected to the shift plate 11 through the rotating shaft 15. When the housing 1 is raised or lowered, the housing 1 drives the shift plate 11 to rotate around the rear wheel axle 141 of the rear wheel axle assembly 14.

[0045] In other embodiments, the lifting connection member 10 is not limited to the above structure. For example, in another embodiment, the lifting connection member 10 includes a shift plate 11 and a connecting rod 12, wherein the two ends of the connecting rod 12 are respectively rotatably connected to the front axle assembly 13 and the rear axle assembly 14, and the shift plate 11 is fixed on the connecting rod 12 and is close to the rear axle assembly 14. When the limit pin 22 is disengaged from the shift slot 111 and the shift plate 11 is not locked by the height adjustment rod 32, raising or lowering the housing 1 can cause the connecting rod 12 to move forward and backward, thereby adjusting the height of the entire machine.

[0046] In order to facilitate the operation of the height adjustment lever 32, Figure 1 and Figure 2 As shown, in one embodiment, the height adjustment handle 30 further includes an unlocking member 33 and an elastic return member 34, wherein the unlocking member 33 is movably mounted on the handle 31, the height adjustment rod 32 is transmission-connected to the unlocking member 33, and the elastic return member 34 is configured to provide an elastic force to lock the limit pin 22 in the gear slot 111. One end of the height adjustment rod 32 is pivotally connected to the rotating member 20; the other end of the height adjustment rod 32 is connected to the unlocking member 33. The unlocking member 33 has an unlocking position and a locking position, as shown in FIG. Figure 6 As shown, the unlocking member 33 is in the unlocking position, and the height of the housing 1 can be raised or lowered by the handle 31; Figure 2 As shown, the unlocking member 33 is in the locking position, and the height of the housing 1 remains fixed, that is, the height of the housing 1 cannot be raised or lowered by the handle 31 at this time.

[0047] In this embodiment, the transmission connection between the height-adjusting rod 32 and the unlocking member 33 means that the unlocking member 33 can drive the height-adjusting rod 32 to move when it moves. The transmission connection here includes that the height-adjusting rod 32 and the unlocking member 33 are directly fixedly connected, or fixedly connected through an intermediate element such as a pin, and also includes that a motion conversion mechanism is provided between the height-adjusting rod 32 and the unlocking member 33. The height-adjusting rod 32 is transmission-connected with the unlocking member 33, and the user can drive the height-adjusting rod 32 to move by operating the unlocking member 33. When the height-adjusting rod 32 and the unlocking member 33 are fixedly connected, the unlocking member 33 protrudes from the handle 31, which is convenient for operation.

[0048] In the specific configuration, the unlocking member 33 is configured to be pressable, and the pressing direction is vertically upward, that is, moving upward along the height direction of the housing 1. Figure 5 As shown, the height adjustment rod 32 includes a driving part 321, a middle extension section 322, and a top connection section 323 from bottom to top, wherein the driving part 321 extends in the vertical direction, the middle extension section 322 is roughly arc-shaped, and the two ends of the middle extension section 322 are respectively connected to the driving part 321 and the top connection section 323, and the top connection section 323 extends in the horizontal direction. When the mowing height needs to be adjusted, the unlocking member 33 is pressed, and the unlocking member 33 drives the top connection section 323 to move in the horizontal direction, so that the height adjustment rod 32 moves vertically upward as a whole, and the driving part 321 drives the limit pin 22 to move upward and disengage from the gear slot 111. Figure 6 As shown, Figure 1 and Figure 2 Compared with the position in the middle, the height adjustment rod 32 moves upward for a distance, and the limit pin 22 escapes from the gear slot 111. Then press the unlocking member 33, raise or lower the housing 1, and when the mowing height is adjusted to the required height, the height adjustment rod 32 is reset, and the elastic reset member 34 resets the limit pin 22 to enter another gear slot 111, thereby completing the mowing height adjustment.

[0049] In the specific configuration, the elastic reset member 34 of the lifting connection member 10 is a tension spring or a torsion spring, one end of the elastic reset member 34 hooks the rotating member 20, and the other end hooks the housing 1. The shift plate 11 does not need to be provided with a structure of a limit elastic reset member 34, so the structure of the shift plate 11 is relatively simple. In the vertical direction, the limit pin 22 and the rear wheel shaft 141 are arranged from top to bottom, and the elastic reset member 34 is arranged along the line from the limit pin 22 to the rear wheel shaft 141.

[0050] The shift plate 11 has a plurality of shift slots 111, and the plurality of shift slots 111 are used to selectively engage with the limit pin 22. Figure 5 and Figure 6As shown, the opening of the gear slot 111 faces upward. It should be noted that the opening direction here refers to that when the cutting height adjustment mechanism 100 is installed on the housing 1, the entrance of the gear slot 111 is at the top of the gear slot 111, so that the limit pin 22 can enter the gear slot 111 when it moves downward, and can escape from the gear slot 111 when it moves upward. In other embodiments, it can be just the opposite, that is, when the cutting height adjustment mechanism 100 is installed on the housing 1, the entrance of the gear slot 111 can be located at the bottom of the gear slot 111, so that the limit pin 22 can enter the gear slot 111 when it moves upward, and can escape from the gear slot 111 when it moves downward.

[0051] In a specific implementation, the opening of the gear slot 111 faces upward, and the unlocking member 33 is configured to be pressable, wherein when the limit pin 22 is engaged in the gear slot 111, when the unlocking member 33 is pressed, the limit pin 22 is driven to move through the height adjustment rod 32 to disengage from the gear slot 111, and the unlocking member 33 moves upward relative to the housing 1. The pressing direction of the unlocking member 33 can be vertically upward, or it can be at a certain angle to the vertical direction, that is, inclined upward. The unlocking member 33 moves vertically upward or obliquely upward relative to the housing 1. By the above means, when it is necessary to adjust the mowing height, first press the unlocking member 33 upward to make the limit pin 22 disengage from the gear slot 111. Since the handle 31 is fixedly connected to the housing 1, the unlocking member 33 can be held to lift or lower the housing 1. In this way, the user can achieve one-handed operation of unlocking and height adjustment. Furthermore, when the height adjustment is achieved by lifting the housing 1, the pressing force borne by the unlocking member 33 is upward, and the direction of the force required to lift the housing 1 is also upward, and the two are consistent, achieving one-handed unlocking and height adjustment, and the operation feels comfortable.

[0052] Further, in order to facilitate raising or lowering the housing 1, as Figure 5 and Figure 8 As shown, the height adjustment handle 30 includes a gripping portion 35 fixedly connected to the handle 31, a clamping member 351 is provided on the gripping portion 35, and an unlocking member 33 is movably mounted on the gripping portion 35, and the unlocking member 33 has a clamping slot 331 that cooperates with the clamping member 351. The clamping slot 331 cooperates with the clamping member 351 to limit the movable path of the height adjustment rod 32, thereby ensuring that the limit pin 22 and the gear slot 111 are accurately separated or clamped.

[0053] Specifically, Figure 5 As shown, when the unlocking member 33 is in the released state, that is, not pressed, the limit pin 22 is engaged with the shift slot 111, and the locking member 351 and the locking slot 331 are in a separated state. Figure 8As shown, when the unlocking member 33 is pressed, the unlocking member 33 moves toward the clamping member 351, and the clamping member 351 enters the slot 331. The height adjustment rod causes the limit pin 22 to move upward to disengage from the gear slot 111, thereby achieving gear disengagement. At this time, the clamping member 351 and the slot 331 are in a mating state so that the position of the height adjustment rod 32 is locked. The user only needs to provide pressure to keep the clamping member 351 and the slot 331 in a mating state. When re-entering the gear, it is only necessary to release the unlocking member 33. Furthermore, an elastic reset member (not shown) may be provided between the unlocking member 33 and the gripping portion 35 to replace the aforementioned elastic reset member 34. After releasing the unlocking member 33, the elastic reset member quickly resets the unlocking member 33. The elastic reset member may be a spring, a spring washer, etc.

[0054] In the above embodiment, when adjusting the mowing height, the user can hold the grip 35 and press the unlocking member 33, and then lift or lower the housing 1 through the grip 35 while pressing the unlocking member 33. The grip 35 can provide a large gripping area, so that it is easy to exert force and the operation feels comfortable.

[0055] As mentioned above, when the mowing height needs to be adjusted, the height adjustment rod 32 is driven to move by operating the unlocking member 33, and the height adjustment rod 32 drives the limit pin 22 to move. Figure 2 and Figure 8 As shown, in a specific embodiment, in the height direction of the housing 1, the opening of the gear slot 111 faces upward. In addition, a through hole 3211 is provided on the height adjustment rod 32, and the stop pin 22 on the rotating member 20 passes through the through hole 3211. When the height adjustment rod 32 moves up and down, the stop pin 22 is driven to move up and down by the through hole 3211. The radial cross-sectional shape of the through hole 3211 is not limited, and can be a circular hole, a square hole or an irregular shape, as long as it can meet the above-mentioned design purpose.

[0056] In this embodiment, the limiting pin 22 and the through hole 3211 are configured to be clearance-matched, and as shown in FIG. Figure 2 As shown, when the limit pin 22 is engaged in the shift slot 111, there is a gap between the through hole 3211 and the limit pin 22, and the limit pin 22 is supported by the shift slot 111. Specifically, when the shift plate 11 is locked, the inner wall of the through hole 3211 does not contact the limit pin 22 in the circumferential direction, and there is a gap between the height adjustment rod 32 and the limit pin 22. The limit pin 22 is engaged in the shift slot 111 and supported by the inner wall of the shift slot 111. In this way, the force of the elastic reset member 34 only acts on the limit pin 22. The force of the limit pin 22 will not be transmitted to the height adjustment rod 32, so the height adjustment rod 32 does not need to bear a large force, the strength requirement of the height adjustment linkage structure is low, and the manufacturing is simpler.

[0057] In addition, there is a gap between the height-adjusting rod 32 and the limit pin 22. When the unlocking member 33 is operated, the height-adjusting rod 32 moves upward for a certain distance before acting on the limit pin 22. The starting force is small, and the operation feel is good.

[0058] In addition, when the limit pin 22 is engaged in the gear slot 111, the height adjustment rod 32 can also be supported by the limit pin 22. That is, at this time, the top of the inner wall of the through hole 3211 is supported by the limit pin 22. Similarly, the force of the elastic reset member 34 only acts on the rotating member 20 but not on the height adjustment rod 32, so that the height adjustment rod 32 does not need to bear a large force, the strength requirement of the height adjustment linkage structure is low, the manufacturing is simpler, and the starting force of the unlocking member 33 is small, which has a better operating feel.

[0059] Please refer to Figure 5 , when the opening of the shift slot 111 faces upward, the shift plate 11 is further provided with a blocking portion 112 located above the plurality of shift slots 111, and an arc-shaped slot 113 is formed between the blocking portion 112 and the plurality of shift slots 111. In specific configuration, the arc-shaped slot 113 can be provided at the top of the shift plate 11, the bottom wall of the arc-shaped slot 113 can be provided with a plurality of shift slots 111, and the top wall of the arc-shaped slot 113 forms the blocking portion 112. When the height adjustment rod 32 drives the limit pin 22 to disengage from the shift slot 111, the blocking portion 112 also serves to limit the travel range of the limit pin 22. The plurality of shift slots 111 are provided at the bottom wall of the arc-shaped slot 113, so the plurality of shift slots 111 are arranged along an arc line, so that after the shift plate 11 rotates, the relative position between the opening of the shift slot 111 and the limit pin 22 remains substantially unchanged, and the limit pin 22 can be inserted into the shift slot 111 relatively smoothly.

[0060] Furthermore, both ends of the arc groove 113 are closed. Specifically, both ends of the arc groove 113 in the arc length direction are closed, and when the housing 1 is raised or lowered, the limit pin 22 can limit the rotation range of the shift plate 11 to prevent the shift plate 11 and the limit pin 22 from being out of the matching relationship.

[0061] like Fig. 9 and Fig.10 , the structure of the cutting height adjustment mechanism of another embodiment is illustrated, including a handle 31 , a height adjustment rod 32 , an unlocking member 33 , a shift plate 11 , and a rotating member 20 to which a rotating shaft 21 and a limiting pin 22 are fixed.

[0062] Similar to the aforementioned embodiment, the unlocking member 33 has an unlocking position and a locking position. The unlocking member 33 can be operated to drive the height adjustment rod 32 to move, and the height adjustment rod 32 drives the rotating member 20 to move, so that the limit pin 22 is engaged with or disengaged from the gear slot 111.

[0063] The difference between this embodiment and the previous embodiment is that: in this embodiment, the height adjustment rod 32 is rotatably connected to the handle 31 via the rotation axis 324, and when the unlocking member 33 is operated, the height adjustment rod 32 is driven to rotate around the rotation axis 324, and when the height adjustment rod 32 rotates, the rotating member 20 is driven to rotate. Fig. 9As shown, a rotating shaft 324 is installed at the upper position of the height adjustment rod 32, and the lower end of the height adjustment rod 32 is pivotally connected to the rotating member 20 through the connecting shaft 23. When the unlocking member 33 is operated, the height adjustment rod 32 is driven to rotate around the rotating shaft 324, and the lower end of the height adjustment rod 32 drives the rotating member 20 to rotate around the rotating shaft 21 through the connecting shaft 23, so that the limit pin 22 can be engaged with or disengaged from the gear slot 111. The height adjustment rod 32 adopts a rotating driving rotating member 20, which is better positioned and less prone to shaking left and right.

[0064] Furthermore, the lines connecting the centers of the rotating shaft 21, the limiting pin 22, and the connecting shaft 23 form a triangle. Fig. 9 and Fig.10 In a specific implementation, the rotating member 20 is roughly in the shape of a triangular plate, and the rotating shaft 21, the limiting pin 22, and the connecting shaft 23 are respectively located at the three ends of the rotating member 20. When the rotating member 20 rotates around the rotating shaft 21, the rotating path of the limiting pin 22 is roughly in the shape of an arc, which is convenient for disengagement and locking. It should be pointed out that the shape of the rotating member 20 is not limited to a triangular plate, as long as the connecting line of the rotating shaft 21, the limiting pin 22, and the connecting shaft 23 forms a triangle.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cutting height adjustment mechanism for a lawn mower, the lawn mower comprising a housing and running wheels for supporting the housing, the running wheels comprising a front wheel and a rear wheel, characterized in that: The cutting height adjustment mechanism comprises: A lifting connection member, the lifting connection member includes a connecting rod and a shift plate, the shift plate has a plurality of shift slots, one end of the connecting rod is rotatably connected to the shift plate, the other end of the connecting rod is connected to a front wheel axle assembly, the shift plate is fixedly connected to a rear wheel axle assembly, a rotating shaft is further provided on the shift plate, the shift plate is rotatably connected to the housing via the rotating shaft, and the front wheel axle assembly and the rear wheel axle assembly are respectively connected to the front wheel and the rear wheel; A handle fixed to the housing, for a user to operate to raise or lower the height of the housing; An unlocking member, operably disposed on the handle; A rotating member, the rotating member is pivotally connected to the housing via a rotating shaft, and a limiting pin is fixed on the rotating member; A height-adjusting rod, one end of which is pivotally connected to the rotating member; the other end of the height-adjusting rod is connected to the unlocking member; the unlocking member can be operated to move relative to the handle to drive the height-adjusting rod and drive the rotating member to rotate, so that the limit pin is engaged or disengaged from the gear slot.

2. The cutting height adjustment mechanism of a lawn mower according to claim 1, characterized in that: The height-adjusting rod is rotatably connected to the handle via a rotating shaft, and the height-adjusting rod is pivotally connected to the rotating member via a connecting shaft. When the unlocking member is operated, the height-adjusting rod is driven to rotate around the rotating shaft, and when the height-adjusting rod rotates, the rotating member is driven to rotate.

3. The cutting height adjustment mechanism of a lawn mower according to claim 2, characterized in that: The connecting line of the centers of the rotating shaft, the limiting pin and the connecting shaft is in the shape of a triangle.

4. The cutting height adjustment mechanism of a lawn mower according to claim 1, characterized in that: The unlocking piece is fixedly arranged on the height-adjusting rod and protrudes from the handle.

5. The cutting height adjustment mechanism of a lawn mower according to claim 1, characterized in that: It also includes an elastic return member, which is configured to provide an elastic force to lock the limit pin in the gear slot.

6. The cutting height adjustment mechanism of a lawn mower according to claim 5, characterized in that: Two ends of the elastic return member are respectively connected to the rotating member and the housing.

7. The cutting height adjustment mechanism of a lawn mower according to claim 1, characterized in that: In the height direction of the casing, the opening of the gear slot faces upward, and the height adjustment rod is provided with a through hole, through which the limit pin passes, and the limit pin is clearance-matched with the through hole. When the limit pin is clamped in the gear slot, the limit pin is supported on the gear slot, and there is a gap between the height adjustment rod and the limit pin or it is supported on the limit pin.

8. The cutting height adjustment mechanism of a lawn mower according to claim 1, characterized in that: The unlocking member is configured to be pressable and to move upward relative to the housing when pressed, wherein when the limit pin is engaged in the gear slot, the unlocking member is pressed and the limit pin is driven by the height adjustment rod to move so as to disengage from the gear slot.

9. The cutting height adjustment mechanism of a lawn mower according to claim 8, characterized in that: A card is provided on the handle, and the unlocking member has a slot selectively matched with the card to limit the movement path of the height adjustment rod, wherein when the unlocking member is pressed, the card enters the slot, and the limit pin is disengaged from the gear slot; when the unlocking member is released, the card is separated from the slot, and the limit pin is engaged with the gear slot.

10. The cutting height adjustment mechanism of a lawn mower according to claim 8, characterized in that: The shift plate is further provided with a blocking portion located above the plurality of shift slots, an arc-shaped slot is formed between the blocking portion and the plurality of shift slots, and the plurality of shift slots are opened on the bottom wall of the arc-shaped slot and arranged in an arc shape.

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