CN212278926U

CN212278926U - Cutting height adjusting mechanism of mower

Info

Publication number: CN212278926U
Application number: CN202020569979.5U
Authority: CN
Inventors: 乔勇; 张峰
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2021-01-05
Anticipated expiration: 2030-04-16

Abstract

The utility model relates to a cutting height adjusting mechanism of a mower, which comprises a connecting rod and a gear plate, wherein the gear plate is provided with a plurality of gear grooves, one end of the connecting rod is rotationally connected with the gear plate, and the other end of the connecting rod is connected with a front wheel shaft component; the rotating piece is pivotally connected to the machine shell and is fixedly provided with a limit pin; a handle for a user to manipulate to raise or lower the height of the housing; the unlocking piece is provided with an unlocking position and a locking position, the lifting handle can raise or lower the height of the machine shell at the unlocking position, and the height of the machine shell is kept fixed at the locking position; one end of the height adjusting rod is pivotally connected with the rotating piece; the other end of the height adjusting rod is connected with the unlocking piece; the unlocking piece can be operated to move relative to the handle so as to drive the heightening rod and drive the rotating piece to rotate, so that the limiting pin is clamped with the gear groove or is separated from the limiting pin and the gear groove, the force of the limiting pin acted on the whole machine is dispersed and stressed to the shell through the rotating piece, and the limiting pin can be reliably locked in the gear groove.

Description

Cutting height adjusting mechanism of mower

Technical Field

The utility model relates to a garden instrument field especially relates to a cutting height adjustment mechanism of lawn mower.

Background

A cutting height adjusting mechanism is generally provided on a garden tool like a hand-push type electric mower to meet the demand for work height adjustment. The existing cutting height adjusting mechanism generally utilizes a handle to drive a height adjusting rod to move, and the height is adjusted by clamping and locking a limiting pin on the height adjusting rod with different gear grooves. However, according to the height adjusting scheme, the gravity of the whole tool is concentrated on the limiting pin, so that the stress of the height adjusting rod is large, the strength of the height adjusting rod is high, and the positioning reliability is poor.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a cutting height adjustment mechanism for a lawnmower that improves positioning reliability.

A cutting height adjustment mechanism for a lawn mower, the lawn mower comprising a housing and a road wheel for supporting the housing, the road wheel comprising a front wheel and a rear wheel, the cutting height adjustment mechanism comprising:

the lifting connecting piece comprises a connecting rod and a gear plate, the gear plate is provided with a plurality of gear grooves, one end of the connecting rod is rotatably connected with the gear plate, the other end of the connecting rod is connected with a front wheel shaft assembly, a rear wheel shaft assembly is fixedly connected onto the gear plate, a rotating shaft is further arranged on the gear plate, the gear plate is rotatably connected with the machine shell through the rotating shaft, and the front wheel shaft assembly and the rear wheel shaft assembly are respectively connected with the front wheel and the rear wheel;

a handle fixed to the housing for user manipulation to raise or lower the height of the housing;

an unlocking member operatively disposed on the handle;

the rotating piece is pivotally connected to the machine shell through a rotating shaft, and a limit pin is fixed on the rotating piece;

one end of the height adjusting rod is pivotally connected with the rotating piece; the other end of the height adjusting rod is connected with the unlocking piece; the unlocking piece can be operated to move relative to the lifting handle so as to drive the heightening rod and drive the rotating piece to rotate, so that the limiting pin is clamped with or separated from the gear groove.

Above-mentioned altitude mixture control structure, the spacer pin sets up on the rotating member, pivot connection between the casing of rotating member and lawn mower, the piece that unlocks links with the rotating member, when the operation piece that unlocks, it rotates to drive the rotating member, can drive the spacer pin can with gear groove joint or break away from when the rotating member rotates, and during spacer pin and gear groove joint, the power that the complete machine acted on the spacer pin distributes the atress to the casing through the rotating member, make the spacer pin lock in the gear groove reliably, the atress of adjusting the pole has been reduced, and avoid the location difficulty of drawing forth from this.

In one embodiment, the height-adjusting rod is rotatably connected with the handle through a rotating shaft, the height-adjusting rod is pivotally connected with the rotating member through a connecting shaft, the unlocking member drives the height-adjusting rod to rotate around the rotating shaft when being operated, and the height-adjusting rod drives the rotating member to rotate when rotating.

In one embodiment, a connecting line of centers of the rotating shaft, the limiting pin and the connecting shaft is triangular.

In one embodiment, the unlocking element is fixedly arranged on the height-adjusting rod and protrudes out of the handle.

In one embodiment, the gear shifting mechanism further comprises an elastic resetting piece, and the elastic resetting piece is configured to provide an elastic force for locking the limiting pin in the gear shifting groove.

In one embodiment, two ends of the elastic reset piece are respectively connected with the rotating piece and the shell.

In one embodiment, in the height direction of the housing, an opening of the gear groove faces upward, the height-adjusting rod is provided with a through hole, the limit pin penetrates through the through hole, the limit pin is in clearance fit with the through hole, when the limit pin is clamped in the gear groove, the limit pin is supported in the gear groove, and a gap is formed between the height-adjusting rod and the limit pin or the limit pin is supported by the limit pin.

In one embodiment, the unlocking piece is configured to be pressed and move upwards relative to the casing when being pressed, wherein when the limiting pin is clamped in the gear groove, the unlocking piece drives the limiting pin to move through the height adjusting rod to be disengaged from the gear groove when being pressed.

In one embodiment, a clamping piece is arranged on the handle, the unlocking piece is provided with a clamping groove selectively matched with the clamping piece to limit the moving path of the height-adjusting rod, when the unlocking piece is pressed, the clamping piece enters the clamping groove, and the limiting pin is separated from the gear groove; when the unlocking piece is released, the clamping piece is separated from the clamping groove, and the limiting pin is clamped with the gear groove.

In one embodiment, the gear plate is further provided with a blocking portion located above the plurality of gear grooves, an arc-shaped groove is formed between the blocking portion and the plurality of gear grooves, and the plurality of gear grooves are arranged on the bottom wall of the arc-shaped groove and are arranged in an arc shape.

In one embodiment, the two sides of the rotating member are respectively provided with a limiting member along the axial direction of the rotating shaft, and the two limiting members abut against the rotating member along the axial direction of the rotating shaft.

Drawings

Fig. 1 is a schematic front structural view of a cutting height adjusting mechanism according to an embodiment of the present invention, when a stop pin is engaged with a gear groove.

Fig. 2 is a schematic view of a back structure of the cutting height adjusting mechanism when a limit pin is clamped in a gear groove.

Fig. 3 is a schematic structural view of the cutting height adjusting mechanism disposed on the housing of the lawn mower and hiding the rear wheel.

Fig. 4 is a schematic structural view of the cutting height adjusting mechanism disposed on the housing of the lawn mower and illustrating the rear wheel.

Fig. 5 is a schematic structural view of the holding portion when the stop pin of the cutting height adjusting mechanism is engaged with the gear groove.

Fig. 6 is a schematic front view of the cutting height adjusting mechanism when the stopper pin is disengaged from the notch.

Fig. 7 is a schematic back view of the cutting height adjusting mechanism with the stopper pin disengaged from the notch.

Fig. 8 is a schematic view illustrating the structure of the grip portion when the stopper pin of the cutting height adjusting mechanism is disengaged from the notch.

Fig. 9 is a schematic front view illustrating a structure of a stop pin of the cutting height adjusting mechanism of another embodiment when the stop pin is engaged with a notch.

Fig. 10 is a partial structural view of the back surface of the cutting height adjusting mechanism according to another embodiment, in which the elevation connecting member is omitted.

The relevant elements in the figure are labeled as follows:

100. a cutting height adjusting mechanism; 10. a lifting connecting piece; 11. a gear plate; 111. a gear groove; 112. a blocking portion; 113. an arc-shaped slot; 12. a connecting rod; 13. a front axle assembly; 14. a rear axle assembly; 141. a rear wheel axle; 15. a rotating shaft; 20. a rotating member; 21. a rotating shaft; 22. a spacing pin; 23. a connecting shaft; 30. heightening the handle; 31. a handle; 32. a height adjusting rod; 321. a drive section; 3211. a through hole; 322. a middle extension section; 323. a top connection section; 324. a rotating shaft; 33. unlocking the lock; 331. a card slot; 34. a tension spring; 35. a grip portion; 351. a fastener; 1. a housing; 2. a traveling wheel; 201. a front wheel; 202 rear wheels; 3. a handrail; 4. and a cutting assembly.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that when a portion is referred to as being "secured to" another portion, it can be directly on the other portion or there can be an intervening portion. When a portion is said to be "connected" to another portion, it may be directly connected to the other portion or intervening portions may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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", "inner", "outer", "clockwise", "counterclockwise", "circumferential" and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The following describes a preferred embodiment of the cutting height adjusting mechanism of the lawn mower according to the present invention with reference to the accompanying drawings.

Referring to fig. 1 and 2, a structure of a cutting height adjusting mechanism 100 of a lawn mower according to an embodiment of the present invention is illustrated. In the embodiment of the present invention, the structure of the cutting height adjusting mechanism 100 and the height adjusting principle thereof are described by taking the case that the garden tool is an electric mower as shown in fig. 3 and 4. The garden tool, as illustrated in fig. 3 and 4, includes a housing 1 and road wheels 2. A cutting assembly 4 is arranged below the machine shell 1. Wherein, the road wheels 2 comprise front wheels 201 and rear wheels 202. The front wheels 201 are provided at the front end of the cabinet 11, and the rear wheels 202 are provided at the rear end of the cabinet 11. In addition, the rear end of the casing 1 is provided with a handrail 3. When the garden tool works, a user holds the handrail 3 to push the garden tool to walk. The front end refers to the end of the garden tool that is away from the user during normal operation, while the rear end refers to the end that is closer to the user.

As shown in fig. 1 and 2, the cutting height adjusting mechanism 100 includes a lifting link 10, a rotating member 20, and a height-adjusting handle 30. Wherein, lift connecting piece 10 rotates with walking wheel 2 to be connected, and lift connecting piece 10 includes gear plate 11, has a plurality of gear grooves 111 on the gear plate 11. One end of the rotating member 20 is pivotally connected to the cabinet 1 by a rotating shaft 21, and the other end is fixed with a stopper pin 22. The height-adjusting handle 30 comprises a handle 31 and a height-adjusting rod 32, the handle 31 is fixed on the casing 1, wherein the handle 31 is used for being operated by a user to raise or lower the height of the casing 1, the height-adjusting rod 32 is movably arranged on the handle 31 relatively, and the height-adjusting rod 32 can be operated to move relative to the casing 1 so as to enable the limiting pin 22 to be clamped with or separated from the gear groove 111.

In a specific arrangement, a rotating shaft 211 is fixed to one end of the rotating member 20, and the rotating shaft 211 is connected to the housing 1 through a bearing. The other end of the rotating member 20 is welded to fix the stopper pin 22. The height-adjusting rod 32 is slidably connected to the handle 31, and the height-adjusting rod 32 may be configured to be assembled with the handle 31 from one side of the handle 31 or configured to penetrate through the interior of the handle 31. One end of the height-adjusting lever 32 is pivotally connected to the rotary member 20. The handle 31 may be secured to the cabinet 1 in any suitable location. The shift position groove 111 is snap-fitted with the stopper pin 22 to lock the shift position plate 11. The gear groove 111 may be configured as a U-shaped groove and the pin position pin 22 may be a cylindrical pin.

The working principle of the cutting height adjusting mechanism 100 is as follows: as shown in fig. 1 and 2, the stopper pin 22 of the rotary member 20 is engaged with one of the shift grooves 111 to determine a mowing height. When the mowing height needs to be adjusted, a user moves the height-adjusting rod 32 relative to the machine shell 1, and the height-adjusting rod 32 drives the rotating member 20 to rotate at the same time, so that the limiting pin 22 is disengaged from the gear groove 111, as shown in fig. 6 to 8. At this time, the shift lever 11 is not locked by the upshift lever 32 and can rotate freely. Afterwards, the machine shell 1 is lifted up or lowered down through the lifting handle 31, the machine shell 1 drives the gear plate 11 to rotate, the heightening rod 32 is reset after the mowing height is adjusted to the required height, the heightening rod 32 drives the rotating piece 20 to rotate, the limiting pin 22 enters the other gear groove 111 to re-lock the gear plate 11, and at the moment, the ground clearance of the cutting assembly 4 is changed due to the change of the ground clearance of the machine shell 1, so that the mowing height adjustment is completed.

In the cutting height adjusting mechanism 100, the limiting pin 22 is disposed on the rotating member 21, and the rotating member 20 is pivotally connected to the housing 1, so that the limiting pin can move to engage with or disengage from the gear groove 111. When the stopper pin 22 is engaged with the gear groove 111, the force applied to the stopper pin 22 by the whole machine is dispersed and forced to the housing 1 through the rotary member 20, so that the stopper pin 22 can be reliably locked in the gear groove 111.

The stopper pin 22 is engaged with and disengaged from the shift groove 111, and is likely to swing left and right as a main force receiving member. For this reason, in some embodiments, the rotation member 20 is provided with stoppers (not shown) at both sides thereof, so that the rotation member 20 can only rotate around the rotation shaft 21, but does not shake in the axial direction of the rotation shaft 21. Specifically, a limiting member may be disposed on the gear plate 11 and the housing 1, and the two limiting members abut against the rotating member 20 from two sides of the rotating member 20 along the axial direction of the rotating shaft 21, so as to limit the rotating member 20 from shaking but allow the rotating member 20 to rotate. Because the heightening rod 32 is linked with the rotating member 20, the shaking of the heightening rod 32 is also limited, so that the heightening linkage structure is more stable. And among the conventional art, the spacer pin directly sets up at heightening pole, needs to carry on spacingly to heightening pole, because heightening pole part is longer, and extends to heightening handle, and its clearance of rocking is bigger, leads to the structure unreliable.

As shown in fig. 1 and 2, the lifting link 10 includes a gear plate 11 and a link 12. One end of a connecting rod 12 is rotatably connected with the gear plate 11, the other end of the connecting rod 12 is connected with a front wheel shaft assembly 13, the gear plate 11 is fixedly connected with a rear wheel shaft assembly 14, a rotating shaft 15 is further arranged on the gear plate 11, and the gear plate 11 is rotatably connected with the casing 1 through the rotating shaft 15. The front wheel axle assembly 13 is used to mount the front wheel 201, and when the front wheel axle assembly 13 is configured to be a dual crank axle structure, two ends of the front wheel axle assembly are respectively mounted with the front wheel 201. The rear axle assembly 14 is configured to mount a rear wheel 202. When the limit pin 22 is disengaged from the shift groove 111, the shift plate 11 is not locked by the height-adjusting rod 32, the casing 1 is connected to the shift plate 11 through the rotating shaft 15, and the casing 1 drives the shift plate 11 to rotate around the rear axle 14 of the rear axle assembly 14 when the casing 1 is raised or lowered.

In other embodiments, the lifting link 10 is not limited to the above-described structure. For example, in another embodiment, the lifting link 10 includes a shift plate 11 and a connecting rod 12, wherein both ends of the connecting rod 12 are rotatably connected to the front axle assembly 13 and the rear axle assembly 14, respectively, 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 gear groove 111 and the gear plate 11 is not locked by the height-adjusting rod 32, the casing 1 is raised or lowered to drive the connecting rod 12 to move back and forth, so that the height of the whole machine is adjusted.

In order to facilitate the operation of the height-adjusting lever 32, as shown in fig. 1 and 2, in an embodiment, the height-adjusting handle 30 further includes an unlocking member 33 and an elastic restoring member 34, wherein the unlocking member 33 is movably mounted on the handle 31, the height-adjusting lever 32 is in transmission connection with the unlocking member 33, and the elastic restoring member 34 is configured to provide an elastic force for locking the position-limiting pin 22 in the position-limiting groove 111. One end of the height-adjusting lever 32 is pivotally connected to the rotary member 20; the other end of the height-adjusting lever 32 is connected to the unlocking member 33. The unlocking member 33 has an unlocking position and a locking position, as shown in fig. 6, the unlocking member 33 is in the unlocking position, and the height of the cabinet 1 can be raised or lowered by the handle 31; as shown in fig. 2, the unlocking member 33 is in the locked position, and the height of the cabinet 1 is kept fixed, that is, the height of the cabinet 1 cannot be raised or lowered by the handle 31.

In this embodiment, the height-adjusting rod 32 is connected to the unlocking member 33 in a transmission manner, so that the unlocking member 33 can drive the height-adjusting rod 32 to move when moving. The transmission connection here includes that the height-adjusting rod 32 is directly and fixedly connected with the unlocking piece 33 or fixedly connected through an intermediate element such as a pin, and a motion conversion mechanism is arranged between the height-adjusting rod 32 and the unlocking piece 33. The height-adjusting rod 32 is in transmission connection with the unlocking piece 33, and a user can drive the height-adjusting rod 32 to move by operating the unlocking piece 33. When the height adjusting rod 32 is fixedly connected with the unlocking piece 33, the unlocking piece 33 protrudes out of the handle 31, so that the operation is convenient.

In a specific arrangement, the unlocking member 33 is configured to be pressed in a vertical upward direction, i.e., upward movement in the height direction of the cabinet 1. As shown in fig. 5, the height-adjusting rod 32 includes a driving portion 321, a middle extending section 322, and a top connecting section 323 from bottom to top, wherein the driving portion 321 extends in a vertical direction, the middle extending section 322 is substantially arc-shaped, two ends of the middle extending section 322 are respectively connected to the driving portion 321 and the top connecting section 323, and the top connecting section 323 extends in a horizontal direction. When the mowing height needs to be adjusted, the unlocking piece 33 is pressed, the unlocking piece 33 drives the top connecting section 323 to move along the horizontal direction, so that the whole height-adjusting rod 32 moves vertically upwards, and the driving part 321 drives the limiting pin 22 to move upwards and disengage from the gear groove 111. As shown in fig. 6, the heightening lever 32 moves upward by a distance as compared with the position in fig. 1 and 2, and the stopper pin 22 is disengaged from the notch 111. Then, the unlocking member 33 is pressed to raise or lower the housing 1, and when the mowing height is adjusted to a desired height, the height adjusting rod 32 is reset, and the elastic reset member 34 resets the stopper pin 22 to enter another gear groove 111, thereby completing mowing height adjustment.

In the specific setting, the elastic restoring element 34 of the lifting connecting element 10 is a tension spring or a torsion spring, one end of the elastic restoring element 34 hooks the rotating element 20, and the other end hooks the casing 1. The structure of the limiting elastic reset piece 34 is not needed to be arranged on the gear plate 11, so that the structure of the gear plate 11 is relatively simple. In the vertical direction, the stopper pin 22 and the rear wheel axle 14 are arranged from top to bottom, and the elastic restoring piece 34 is arranged along a connecting line between the stopper pin 22 and the rear wheel axle 14.

The gear plate 11 has a plurality of gear slots 111, and the plurality of gear slots 111 are used to alternatively engage with the stopper pin 22. In the height direction of the housing 1, i.e., the vertical direction, as shown in fig. 5 and 6, the opening of the shift groove 111 faces upward. It should be noted that, when the opening direction refers to that the cutting height adjusting mechanism 100 is installed in the housing 1, the entrance of the gear groove 111 is at the top of the gear groove 111, so that the limiting pin 22 can enter the gear groove 111 when moving downwards, and the limiting pin 22 can be disengaged from the gear groove 111 when moving upwards. In other embodiments, the opposite may be true, that is, when the cutting height adjusting mechanism 100 is installed in the housing 1, the entrance of the gear groove 111 may be located at the bottom of the gear groove 111, so that the limiting pin 22 can enter the gear groove 111 when moving upwards, and can be removed from the gear groove 111 when moving downwards.

In specific implementation, the opening of the gear groove 111 faces upward, the unlocking member 33 is configured to be pressed, wherein when the limit pin 22 is clamped in the gear groove 111, the unlocking member 33 drives the limit pin 22 to move to be separated from the gear groove 111 through the height-adjusting rod 32 when being pressed, and the unlocking member 33 moves upward relative to the housing 1. The pressing direction of the unlocking member 33 may be vertical upward, or may be inclined upward at a certain angle to the vertical direction. The unlocking member 33 moves vertically upward or obliquely upward with respect to the cabinet 1. Through the above means, when the mowing height needs to be adjusted, the unlocking piece 33 is pressed upwards firstly, so that the limiting pin 22 is disengaged from the gear groove 111, and the unlocking piece 33 can be held to raise or lower the machine shell 1 due to the fixed connection of the handle 31 and the machine shell 1. The user can thus carry out the one-handed operation of unlocking and height adjustment. Moreover, when the height adjustment is realized by raising the case 1, the pressing force borne by the unlocking piece 33 is upward, and the direction of the force required for raising the case 1 is also upward, so that the unlocking and the height adjustment are realized by one hand, and the operation feeling is comfortable.

Further, in order to conveniently raise or lower the housing 1, as shown in fig. 5 and 8, the height-adjusting handle 30 includes a holding portion 35 fixedly connected to the handle 31, a latching member 351 is disposed on the holding portion 35, the unlocking member 33 is movably mounted on the holding portion 35, and the unlocking member 33 has a slot 331 engaged with the latching member 351. The engaging groove 331 is engaged with the engaging member 35 to limit the moving path of the height adjusting rod 32, so as to ensure that the stop pin 22 is accurately disengaged from or engaged with the gear groove 111.

Specifically, as shown in fig. 5, when the unlocking member 33 is in the release state, i.e., not pressed, the stopper pin 22 is engaged with the shift groove 111, and the latching member 351 is separated from the latching groove 331. As shown in fig. 8, when the unlocking member 33 is pressed, the unlocking member 33 moves towards the card member 351, the card member 351 enters the card slot 331, the adjusting rod makes the limiting pin 22 move upwards to be separated from the gear slot 111, so as to realize gear disengagement, at this time, the card member 351 and the card slot 331 are in a matching state to lock the position of the adjusting rod 32, and the user only needs to provide pressure to make the card member 351 and the card slot 331 keep a matching state. The unlocking member 33 is simply released to reenter the gear. Further, an elastic restoring member (not shown) may be disposed between the unlocking member 33 and the holding portion 35 instead of the elastic restoring member 34. After the unlocking piece 33 is released, the elastic resetting piece enables the unlocking piece 33 to be reset quickly. The elastic reset piece can be a spring, an elastic cushion and the like.

In the above embodiment, when adjusting the mowing height, the user may hold the holding portion 35, press the unlocking member 33, and then raise or lower the housing 1 through the holding portion 35 while pressing the unlocking member 33. The grip portion 35 provides a large grip area, thereby facilitating exertion and providing a comfortable feeling of operation.

As described above, when the mowing height needs to be adjusted, the unlocking piece 33 is operated to drive the height-adjusting rod 32 to move, and the height-adjusting rod 32 drives the limiting pin 22 to move. As shown in fig. 2 and 8, in a specific embodiment, the opening of the shift groove 111 faces upward in the height direction of the housing 1. In addition, a through hole 3211 is formed in the height adjustment rod 32, and the limit pin 22 of the rotary member 20 passes through the through hole 3211. When the height-adjusting rod 32 moves up and down, the through hole 3211 drives the limit pin 22 to move up and down. The radial cross-sectional shape of the through hole 3211 is not limited, and may be a circular hole, a square hole, or an irregular shape, which can satisfy the above design objectives.

In this embodiment, the position-limiting pin 22 and the through hole 3211 are in clearance fit, and as shown in fig. 2, when the position-limiting pin 22 is clamped in the gear groove 111, a clearance is formed between the through hole 3211 and the position-limiting pin 22, and the position-limiting pin 22 is supported by the gear groove 111. Specifically, when the gear plate 11 is locked, the inner wall of the through hole 3211 does not contact the limit pin 22 in the circumferential direction, a gap is formed between the height-adjusting rod 32 and the limit pin 22, and the limit pin 22 is clamped in the gear groove 111 and supported by the inner wall of the gear groove 111. In this way, the force of the resilient return member 34 acts only on the arrest pin 22. The stress of the limit pin 22 is not transferred to the heightening rod 32, so that the heightening rod 32 does not need to bear large force, the strength requirement of the heightening linkage structure is low, and the manufacture is simpler.

Moreover, a gap is formed between the heightening rod 32 and the limit pin 22, when the unlocking piece 33 is operated, the heightening rod 32 moves upwards for a certain distance and then acts on the limit pin 22, the starting force is small, and the operation hand feeling is good.

In addition, when the limit pin 22 is engaged with the gear groove 111, the height adjusting rod 32 may be supported by the limit pin 22. That is, the top of the inner wall of the through hole 3211 is supported by the stopper pin 22. Likewise, the acting force of the elastic reset piece 34 only acts on the rotating piece 20 and does not act on the heightening rod 32, so that the heightening rod 32 does not need to bear large force, the strength requirement of the heightening linkage structure is low, the manufacturing is simpler, the starting force of the unlocking piece 33 is small, and the unlocking piece has good operation hand feeling.

Referring to fig. 5, when the opening of the shift slot 111 faces upward, the shift plate 11 further has a blocking portion 112 located above the shift slots 111, and an arc-shaped slot 113 is formed between the blocking portion 112 and the shift slots 111. During specific setting, an arc-shaped groove 113 can be formed in the top of the shift lever 11, a plurality of shift levers 111 are formed in the bottom wall of the arc-shaped groove 113, and a blocking portion 112 is formed on the top wall of the arc-shaped groove 113. When the height-adjusting lever 32 drives the stopper pin 22 to disengage from the notch 111, the stopper 112 also serves to limit the range of travel of the stopper pin 22. The plurality of gear grooves 111 are formed in the bottom wall of the arc-shaped groove 113, so that the plurality of gear grooves 111 are arranged along an arc line, after the gear plate 11 rotates, the relative positions of the opening of the gear groove 111 and the limiting pin 22 are basically unchanged, and the limiting pin 22 can be smoothly inserted into the gear grooves 111.

Further, both ends of the arc-shaped groove 113 are closed. Specifically, both ends of the arc length direction of the arc-shaped groove 113 are sealed, and when the casing 1 is raised or lowered, the limit pin 22 can limit the rotation range of the gear plate 11, so that the gear plate 11 and the limit pin 22 are prevented from being disengaged from each other.

As shown in fig. 9 and 10, the structure of a cutting height adjusting mechanism according to another embodiment is illustrated, which includes a handle 31, a lever adjusting rod 32, an unlocking member 33, a shift position plate 11, and a rotating member 20 to which a rotating shaft 21 and a stopper pin 22 are fixed.

As in the previous embodiment, the unlocking member 33 has an unlocking position and a locking position, and the unlocking member 33 can be operated to drive the lever rod 32 to move, and the lever rod 32 drives the rotating member 20 to move, so that the limit pin 22 is engaged with or disengaged from the gear groove 111.

The present embodiment differs from the previous embodiments in that: in this embodiment, the height-adjusting rod 32 is rotatably connected to the handle 31 through the rotating shaft 324, the unlocking member 33 drives the height-adjusting rod 32 to rotate around the rotating shaft 324 when being operated, and the rotating member 20 is driven to rotate when the height-adjusting rod 32 rotates. Specifically, as shown in fig. 9, a rotating shaft 324 is mounted at an upper position of the height adjusting lever 32, and a lower end of the height adjusting lever 32 is pivotally connected to the rotating member 20 through a connecting shaft 23. When the unlocking member 33 is operated, the height-adjusting rod 32 is driven to rotate around the rotating shaft 324, and the lower end of the height-adjusting 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 clamped with or separated from the gear groove 111. The height-adjusting rod 32 adopts the rotary driving rotating part 20, so that the positioning is better, and the left-right shaking is not easy to occur.

Further, the connecting line of the centers of the rotating shaft 21, the stopper pin 22 and the connecting shaft 23 forms a triangle. In the embodiment shown in fig. 9 and 10, the rotary member 20 is substantially triangular plate-shaped, and the rotary shaft 21, the stopper pin 22, and the connecting shaft 23 are located at three ends of the rotary member 20. When the rotating member 21 rotates around the rotating shaft 21, the rotation path of the limiting pin 22 is substantially circular arc, so as to facilitate detachment and blocking. Note that the shape of the rotary member 20 is not limited to the triangular plate shape, as long as the connecting line of the rotary shaft 21, the stopper pin 22, and the connecting shaft 23 forms a triangle.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a cutting height adjustment mechanism of lawn mower, the lawn mower includes the casing and is used for supporting the walking wheel of casing, the walking wheel includes front wheel and rear wheel, its characterized in that, cutting height adjustment mechanism includes:

an unlocking member operatively disposed on the handle;

2. The cutting height adjustment mechanism of a lawn mower as claimed in claim 1, wherein said height adjustment lever is pivotally connected to said handle by a pivot shaft, said height adjustment lever is pivotally connected to a rotating member by a connecting shaft, said unlocking member is operable to drive said height adjustment lever to rotate about said pivot shaft, and said height adjustment lever rotates to drive said rotating member to rotate.

3. The cutting height adjusting mechanism of a lawn mower according to claim 2, wherein a line connecting centers of the rotating shaft, the stopper pin and the connecting shaft is triangular.

4. The cutting height adjustment mechanism of a lawn mower as claimed in claim 1, wherein said unlocking member is fixedly provided on said height-adjusting lever and protrudes from said handle.

5. The cutting height adjustment mechanism of a lawn mower of claim 1, further comprising an elastic return member configured to provide an elastic force to lock the stopper pin in the notch groove.

6. The cutting height adjusting mechanism of a lawn mower according to claim 5, wherein both ends of said elastic restoring member are connected to said rotary member and said housing, respectively.

7. The cutting height adjusting mechanism of a lawn mower according to claim 1, wherein an opening of the position-restricting groove faces upward in a height direction of the housing, the height-adjusting lever is provided with a through hole, the position-restricting pin passes through the through hole, the position-restricting pin is in clearance fit with the through hole, the position-restricting pin is supported by the position-restricting groove when the position-restricting pin is engaged with the position-restricting groove, and a gap is formed between the height-adjusting lever and the position-restricting pin or the position-restricting pin is supported by the position-restricting pin.

8. The cutting height adjustment mechanism of a lawn mower according to claim 1, wherein said unlocking member is configured to be pressed and moved upward with respect to said housing when pressed, wherein when said stopper pin is caught in said notch groove, said unlocking member drives said stopper pin to move to be disengaged from said notch groove by said heightening lever when pressed.

9. The cutting height adjusting mechanism of a lawn mower according to claim 8, wherein a catch is provided on said handle, and said unlocking member has a catching groove selectively engaged with said catch to restrict a moving path of said height adjusting lever, wherein when said unlocking member is pressed, said catch enters said catching groove, and said stopper pin is disengaged from said shift position groove; when the unlocking piece is released, the clamping piece is separated from the clamping groove, and the limiting pin is clamped with the gear groove.

10. The cutting height adjusting mechanism of a lawn mower according to claim 8, wherein said shift plate is further provided with a blocking portion located above said plurality of shift grooves, an arc-shaped groove is formed between said blocking portion and said plurality of shift grooves, and said plurality of shift grooves are opened at a bottom wall of said arc-shaped groove and are arranged in an arc shape.