Height adjustment mechanism for a gardening tool and gardening tool

Abstract

A height adjustment mechanism for a gardening tool provided by the present invention and the corresponding gardening tool are used to adjust the height position of the motor part. The motor part is in transmission connection with the working part. The height adjustment mechanism includes: a housing part for accommodating the motor part; an adjustment part for driving the motor part to make a linear lifting movement within the housing part; a knob part for driving the adjustment part to make a rotational movement and a lifting movement. The knob part is rotatably arranged on the upper side of the housing part. Among them, a first transmission thread and a second transmission thread are arranged on the outer side of the adjustment part. The first transmission thread and the second transmission thread have opposite helix directions. A third transmission thread is arranged at the upper side position of the housing part. The third transmission thread is in linkage cooperation with the first transmission thread. A fourth transmission thread is arranged at the upper side position of the motor part. The fourth transmission thread is in linkage cooperation with the second transmission thread. The present invention can reduce the volume and quantity of components, improve the smoothness of operation, and avoid jamming.

Description

Technical Field

[0001] The invention relates to the technical field of garden tools, in particular to a garden tool height adjustment mechanism and the garden tool. Background Art

[0002] An intelligent lawn mower is a type of garden tool, such as an intelligent lawn mower disclosed in patent document 1, which includes: a body; a walking mechanism for driving the intelligent lawn mower to walk and turn; a cutting mechanism, wherein the cutting mechanism includes a blade connected to the lower end of a motor output end for performing a cutting operation; a protective mechanism located around the cutting mechanism to establish a protective barrier around the cutting mechanism, wherein a grass inlet is provided on the protective mechanism; and a height adjustment mechanism for adjusting the height between the cutting module and the ground, and controlling the cutting mechanism to a low mowing height.

[0003] At present, the height adjustment mechanism of this type of smart lawn mower adopts a height adjustment structure of a threaded knob with a spring, that is, a large-pitch threaded knob height adjustment structure. The large pitch is adopted to meet the situation where the knob twisting angle is not greater than 360° (generally <320°, which is convenient for indicating the high gear) to achieve a thread axial height adjustment distance of >30mm (30-60mm). Because the pitch is wide, in order to increase the self-locking ability of the thread and reduce the gear shifting torque, the knob thread is generally larger in diameter, and a compression spring is required to provide the force for the moving parts to move upward when shifting gears. Therefore, there will be uneven force when shifting up and down, uncomfortable feel and easy jamming. Therefore, the larger the height adjustment range, the wider the corresponding pitch, and the more uneven the up and down gear adjustment force. Therefore, the range of expansion of the height adjustment range is very limited, which is insufficient. Summary of the invention

[0004] The present invention aims to avoid the deficiencies of the prior art and provides a height adjustment mechanism for a garden tool to achieve rapid and large-scale height adjustment without any lag.

[0005] The present invention solves the technical problem by adopting the following technical solution: a height adjustment mechanism of a garden tool, used for adjusting the height position of a motor part, the motor part is transmission-connected with a working part, the height adjustment mechanism comprises: a casing part for accommodating the motor part;

[0006] An adjusting part for driving the motor part to make a linear lifting motion in the casing part;

[0007] A knob portion for driving the adjustment portion to perform rotational and lifting movements, wherein the knob portion is rotatably disposed on the upper side of the housing portion;

[0008] Wherein, a first drive thread and a second drive thread are provided on the outside of the adjustment part, the first drive thread and the second drive thread have opposite helix directions, a third drive thread is provided at the upper side position of the housing part, the third drive thread is in linkage cooperation with the first drive thread, and a fourth drive thread is provided at the upper side position of the motor part, the fourth drive thread is in linkage cooperation with the second drive thread.

[0009] In several embodiments, a through hole is axially provided on the adjustment part;

[0010] The knob part includes a rotating body and a guiding body provided on the lower side of the rotating body. The through hole allows the guiding body to penetrate, and the adjustment part can make a lifting movement along the guiding body.

[0011] In several embodiments, the housing part includes a main housing and an end cover body, and the motor part is arranged inside the main housing;

[0012] An annular screwing body one is provided on the end cover body, and the third drive thread is arranged inside the screwing body one.

[0013] In several embodiments, the rotating body is arranged on the screwing body one, and the guiding body passes downward through the screwing body one and penetrates into the adjustment part;

[0014] Tooth-shaped protrusions are provided on the outside of the screwing body one, and an elastic sheet body is provided on the rotating body. The elastic sheet body cooperates with the protrusions to provide rotational resistance.

[0015] In several embodiments, an annular screwing body two is provided at the upper side position of the motor part, and the fourth drive thread is arranged inside the screwing body two.

[0016] In several embodiments, at least two limiting structures are provided at the side position of the motor part. The limiting structures are used to limit the rotational movement of the motor part, and the motor part can make a linear lifting movement along the limiting structures.

[0017] In several embodiments, the limiting structures include:

[0018] A first limiting part, connected to the outer side of the motor part, the first limiting part includes a vertically arranged guiding plate body;

[0019] A second limiting part, including a vertically arranged and elastic slide rail body, and a guiding groove for the guiding plate body to insert and move is provided on the slide rail body.

[0020] In several embodiments, the first limiting part further includes two side plate bodies arranged on both sides of the guiding plate body, and a reinforcing plate body is arranged between the side plate bodies and the guiding plate body;

[0021] The second limiting part further includes a mounting frame body, the mounting frame body is arranged on the inner side of the main housing, one end of the slide rail body is connected to the mounting frame body, and the mounting frame body is erected outside the two side plate bodies.

[0022] In several embodiments, a ring cover body is further arranged on the upper side of the end cover body, the knob part can rotate in the ring cover body, and the rotation adjustment data information can be read through the ring cover body.

[0023] And, a gardening tool adopting the above-mentioned height adjustment mechanism.

[0024] The present invention has the following beneficial effects:

[0025] Through the structure of the positive and negative thread of the adjustment part, the present invention can shorten the pitch by double under the same height adjustment amplitude, and at the same time, the overall outer diameter of the adjustment part is greatly reduced, the rotation is smoother, the effort is saved, and there will be no jamming.

[0026] The structure of the present invention is compact, without using a spring structure, improving the operation experience and the cost of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are only for the purpose of illustrating the selected embodiments and do not represent all possible embodiments, and should not be considered as a limitation of the scope of the present invention.

[0028] Figure 1 Schematically shows the axial sectional structure of the height adjustment mechanism of the gardening tool in Embodiment 1;

[0029] Figure 2 Schematically shows Figure 1 the sectional structure in the direction of A-A in

[0030] Figure 3 Schematically shows Figure 1 the exploded structure of

[0031] Figure 4 Schematically shows Figure 3 the enlarged structure of the adjustment part in

[0032] Figure 5 Schematically shows Figure 3 the enlarged structure of the end cover body in

[0033] Figure 6 Schematically shows Figure 3 the overall enlarged structure of the motor part and the working part in

[0034] Figure 7 Schematically shows Figure 3 the enlarged structure of the knob part in

[0035] Figure 8Schematically shows Figure 3 The enlarged structure of the middle cover body;

[0036] Figure 9 Schematically shows Figure 3 The enlarged structure of the second middle limiting part;

[0037] Figure 10 Schematically shows Figure 3 The enlarged structure of the position of the first middle limiting part;

[0038] Figure 11 Schematically shows the overall structure of the intelligent lawn mower in this embodiment. Detailed implementation manners

[0039] Next, the embodiments of the present invention will be described in detail. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention.

[0040] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0041] The terms used herein are intended to explain the embodiments and are not intended to limit and / or define the present invention.

[0042] For example, expressions indicating relative or absolute configurations such as "in a certain direction", "along a certain direction", "relative", "upper and lower sides", etc. not only mean such a configuration in a strict sense, but also mean a state of relative displacement with tolerances or with angles or distances that can achieve the same functional degree.

[0043] Embodiment 1

[0044] Such as Figures 1 - 3As shown in the figure, the height adjustment mechanism in this embodiment can be applied to a lawn mower. It is mainly composed of a motor part 1, a working part 2, a housing part 10, an adjustment part 20, and a knob part 30. The motor part 1 and the working part 2 are common accessories of the lawn mower. The working part 2 is the lawn mowing blade structure, and the mowing action is realized by the driving movement of the motor part 1. The housing part 10 first plays the role of assembling the motor part 1, the adjustment part 20, and the knob part 30. The knob part 30 uses the knob structure to apply external human force, such as the force of a human hand, to twist and drive the adjustment part 20 to move. Through the left - hand and right - hand thread structure, the adjustment part 20 drives the motor part 1 to change the height within the housing part 10. Compared with the single - thread structure, a double - height change stroke can be achieved with a single rotation, and then the distance between the working part 2 and the ground can be adjusted.

[0045] Specifically, combined with Figure 4 , the adjustment part 20 is formed by coaxially molding two cylindrical structures with different outer diameters. The outer diameter of the upper half is larger than that of the lower half. Correspondingly, a first transmission thread 100 and a second transmission thread 200 are arranged on the outside of the adjustment part 20. The first transmission thread 100 and the second transmission thread 200 have opposite helix directions, that is, they form a left - hand and right - hand thread structure, and their pitches are the same. The first transmission thread 100 is distributed around the upper half, and the second transmission thread 200 is distributed around the lower half. Usually, the height of the upper half is less than that of the lower half.

[0046] At the same time, a through - hole 21 is axially penetrated at the axial position of the adjustment part 20. The shape of the through - hole 21 can be flat, elliptical, etc. The function of the through - hole 21 will be described in combination with the knob part 30 below.

[0047] And, combined with Figure 5 , the housing part 10 is composed of a main housing 11 and an end - cover body 12 that are detachably connected. The end - cover body 12 is assembled at the upper - end opening position of the main housing 11 through structures such as bolts. And a ring - shaped first rotary body 13 is provided at the center position of the end - cover body 12. The first rotary body 13 protrudes upward to the upper - end surface of the end - cover body 12. Thus, a third transmission thread 300 is provided inside the first rotary body 13. The third transmission thread 300 is in linkage cooperation with the first transmission thread 100, that is, they have the same helix direction. Therefore, the upper half of the adjustment part 20 is screwed inside the first rotary body 13, and the adjustment part 20 can rotate and move up and down inside the first rotary body 13 as a whole.

[0048] At the same time, tooth - shaped protrusions 131 are evenly and circumferentially arranged on the outside of the part where the first rotary body 13 protrudes from the end - cover body 12. The function of the protrusions 131 will be described in combination with the knob part 30 below.

[0049] And, combined with Figure 6, an annular rotating connector two 14 is provided at the upper side axial center position of the motor part 1. A transmission thread four 400 is provided on the inner wall of the rotating connector two 14. The transmission thread four 400 is correspondingly linked and matched with the transmission thread two 200, and the two have the same helix direction. That is, the lower half of the adjusting part 20 is screwed into the rotating connector two 14 through threads.

[0050] And, combined with Figure 7 , the knob part 30 includes a rotating body 31 and a guiding body 32 provided on the lower side of the rotating body 31. The length of the guiding body 32 is greater than the length of the through hole 21 in the adjusting part 20 above. The shapes of the two are adapted. Thus, the guiding body 32 can just penetrate into the through hole 21. By rotating the rotating body 31, the adjusting part 20 can be driven to rotate in the rotating connector one 13. Since the rotating connector one 13 and the end cover body 12 are fixed and immovable, thus, when the adjusting part 20 rotates, the adjusting part 20 will make a lifting movement along the guiding body 32.

[0051] At the same time, two elastic sheet bodies 311 are symmetrically provided at the side position of the rotating body 31. The elastic sheet bodies 311 are clamped between the two adjacent protrusions 131 above to give a rotational resistance. Only when the rotating body 31 overcomes this resistance under the action of an external force can it rotate relatively, and at the same time give a rotational feedback.

[0052] And, combined with Figure 8 , a ring cover body 60 is also sleeved at the position of the rotating body 31. It is located above the end cover body 12 and can be in plug-in fit with the end cover body 12. The rotation angle or height value is engraved on the upper end face of the ring cover body 60. Combined with the arrow mark on the rotating body 31, thus, when the rotating body 31 rotates to the specified data position, it indicates the current rotation data or height data information, which is convenient for reading.

[0053] And, combined with Figure 9 And Figure 10 , in order to realize the lifting movement rather than the rotational movement of the motor part 1 in the main housing 11, a limiting structure is provided on the motor part 1 and the main housing 11. The limiting structure is mainly composed of two limiting parts one 40 provided at the outer side position of the motor part 1 and two limiting parts two 50 provided at the inner side position of the main housing 11.

[0054] Among them, the limiting part one 40 includes a vertically arranged guiding plate body 41, two side plate bodies 42 also vertically arranged on both sides of the guiding plate body 41, and a reinforcing plate body 43 horizontally arranged between the side plate bodies 42 and the guiding plate body 41. That is, there is a certain distance between the side plate bodies 42 and the guiding plate body 41, and the distance is connected by a plurality of reinforcing plate bodies 43 to ensure the flatness of the guiding plate body 41.

[0055] The limiting part two 50 includes an elastic slide rail body 51 arranged vertically and a mounting frame body 52. The mounting frame body 52 is generally in a U-shaped structure and is assembled inside the main housing 11. The elastic slide rail body 51 is located inside the mounting frame body 52. One end of it is connected to the slide rail body 51, and the other end is in a movable state. Correspondingly, a guide groove 511 is formed on the slide rail body 51 along its length direction.

[0056] Thus, when the limiting part one 40 and the limiting part two 50 are assembled, the two sides of the mounting frame body 52 are just attached to the outer walls of the two side plate bodies 42, forming a mounting structure. The guide plate body 41 is just inserted into the guide groove 511. Thus, due to the plug-in fit between the guide plate body 41 and the slide rail body 51, the motor part 1 cannot rotate, but can only move linearly up and down along the slide rail body 51.

[0057] As Figure 11 shown, when used in combination with a lawn mower, the height adjustment mechanism is integrally placed inside the housing 3 of the lawn mower, and the knob part 30 and the ring cover body 60 are exposed outside, which is convenient for manual rotation and reading of information.

[0058] Assume that the driving thread one 100 and the driving thread three 300 are right-handed threads, and the driving thread four 400 is correspondingly a left-handed thread with the driving thread two 200. When the present invention adjusts the height, by rotating the knob part 30 in one direction, the driving thread one 100 on the upper half of the adjusting part 20 and the driving thread three 300 in the rotating joint body one 13 are screwed together and move upward. Due to the limitation of the limiting structure, the motor part 1 and the working part 2 can only move upward simultaneously in the state where the driving thread four 400 on the rotating joint body two 14 is screwed with the driving thread two 200 on the lower half of the adjusting part 20, thereby increasing the height from the ground; when it is necessary to reduce the height from the ground, just rotate the knob part 30 in the reverse direction.

[0059] The examples shown in the present invention, the embodiments and special forms have been detailedly shown and described in the drawings and the foregoing description, and should also be considered illustrative rather than restrictive. The description of special features in one embodiment does not mean that those special features must be limited to that one embodiment. The features of one embodiment can be used in combination with the features of other embodiments, which can be understood by those of ordinary skill in the art, whether explicitly stated or not. Exemplary embodiments have been shown and described, and all changes and improvements fall within the spirit of the present invention and are expected to be protected.

Claims

1. A height adjustment mechanism for a garden tool, used to adjust the height position of a motor part, wherein the motor part is in transmission connection with a working part, characterized in that: The height adjustment mechanism includes: A housing part for accommodating the motor part; An adjustment part for driving the motor part to make a linear lifting movement within the housing part; A knob part for driving the adjustment part to make rotational and lifting movements, and the knob part is rotatably arranged on the upper side of the housing part; Wherein, the adjustment part is coaxially formed by two columnar structures with different outer diameters. The outer diameter of the upper half is larger than that of the lower half, the height of the upper half is smaller than that of the lower half. A first transmission thread is provided on the upper half, and a second transmission thread is provided on the lower half. The first transmission thread and the second transmission thread have opposite helix directions. A third transmission thread is provided at the upper side position of the housing part, and the third transmission thread is in linkage cooperation with the first transmission thread. A fourth transmission thread is provided at the upper side position of the motor part, and the fourth transmission thread is in linkage cooperation with the second transmission thread; At least two limiting structures are provided at the side position of the motor part. The limiting structures are used to limit the rotational movement of the motor part, and the motor part can make a linear lifting movement along the limiting structures; The limiting structure includes: a first limiting part connected to the outer side of the motor part. The first limiting part includes a vertically arranged guiding plate body; a second limiting part includes a vertically arranged and elastic sliding rail body, and a guiding groove for the guiding plate body to insert and move is provided on the sliding rail body.

2. The height adjustment mechanism of a gardening tool according to claim 1, characterized in that, A through hole is axially provided on the adjustment part; The knob part includes a rotating main body and a guiding body arranged on the lower side of the rotating main body. The through hole allows the guiding body to pass through, and the adjustment part can make a lifting movement along the guiding body.

3. The height adjustment mechanism of a gardening tool according to claim 2, characterized in that The housing part includes a main housing and an end cover body, and the motor part is arranged in the main housing; An annular screwing body one is provided on the end cover body, and the third transmission thread is arranged inside the screwing body one.

4. The height adjustment mechanism of a gardening tool according to claim 3, characterized in that, The rotating main body is arranged on the screwing body one, and the guiding body passes downward through the screwing body one and into the adjustment part; tooth-shaped protrusions are provided on the outer side of the screwing body one, and an elastic sheet body is provided on the rotating main body. The elastic sheet body cooperates with the protrusions to provide rotational resistance.

5. The height adjustment mechanism of a gardening tool according to claim 1, characterized in that, An annular screwing body two is provided at the upper side position of the motor part, and the fourth transmission thread is arranged inside the screwing body two.

6. The height adjustment mechanism of a gardening tool according to claim 5, characterized in that, The first limiting part further includes two side plate bodies arranged on both sides of the guiding plate body, and a reinforcing plate body is arranged between the side plate bodies and the guiding plate body; The second limiting part further includes a mounting frame body. The mounting frame body is arranged on the inner side of the main housing. One end of the sliding rail body is connected to the mounting frame body, and the mounting frame body is arranged outside the two side plate bodies.

7. The height adjustment mechanism of a gardening tool according to claim 3, characterized in that, An annular cover body is further provided on the upper side of the end cover body. The knob part can rotate within the annular cover body, and the rotational adjustment data information can be read through the annular cover body.

8. A gardening tool, characterized in that, A height adjustment mechanism for a gardening tool as described in any one of claims 1 - 7.

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