CN110446425A

CN110446425A - Grass trimmer, intelligent grass-removing and toolbox

Info

Publication number: CN110446425A
Application number: CN201880018728.3A
Authority: CN
Inventors: 查霞红; 安德罗·保罗; 赵凤丽; 周晓青
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2017-09-30
Filing date: 2018-09-30
Publication date: 2019-11-12
Also published as: DE212018000289U1; WO2019063012A1

Abstract

A kind of grass trimmer (100), comprising: fuselage (10), be with grass trimmer (100) direction of advance it is longitudinal, be with the direction perpendicular to ground it is vertical, to be transverse direction both perpendicular to longitudinal and vertical direction；It is installed on the cutting motor of fuselage (10)；It is installed on the toolbox of fuselage (10), is driven by cutting motor, toolbox includes the first unit and second unit of opposite back and forth movement, and second unit is located at below first unit；Grass trimmer (100) further includes top barrier, forms the protection to toolbox in longitudinal and/or transverse direction；Second unit includes lower shield (120), and lower shield (120) includes multiple protective units, forms the gap leaked through for grass between adjacent protective unit.The grass trimmer can efficiently cut to zone boundary and barrier edge, and prevent from three-dimensional hand, foot or virgin arm from surprisingly touching the blade of movement.

Description

Lawn mower, intelligent lawn mower and cutter assembly

Technical Field

The invention relates to a mower, in particular to an intelligent mower, and further relates to a cutter assembly capable of being mounted on the mower.

Background

With the continuous progress of computer technology and artificial intelligence technology, intelligent lawn mowers have started to walk slowly into people's lives. The intelligent mower can automatically mow and charge the lawn of the user without user interference. After the automatic working system is set once, the user is freed from tedious and time-consuming and labor-consuming housework such as cleaning, lawn maintenance and the like without being invested in energy management.

The intelligent mower can walk on a lawn and trim the lawn within a range limited by a boundary line or other forms, most of cutting mechanisms of the traditional mower are a central rotating cutter disc arranged in the middle below a machine shell, the cutter disc is far away from the outer side of the machine shell, and when the mower walks to the edge of the lawn, the mower can automatically turn, so that the lawn near the boundary line cannot be cut. Even though the lawn mower with the offset cutterhead appears on the market at present, the lawn mower is limited by the consideration of safe use, and the arrangement of the protective devices such as the casing and the shield enables the lawn at the edge of the working area to be always incapable of being cut, so that the lawn mower needs to be trimmed by other tools by a user, and is inconvenient for the user.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the mower which can cut edges and has high safety.

The invention solves the technical problem that the prior art adopts a technical scheme that:

a lawn mower, comprising: the mower comprises a mower body, a mower body and a control device, wherein the mower body takes the advancing direction as the longitudinal direction of the mower body, takes the direction vertical to the ground as the vertical direction of the mower body, and takes the direction vertical to the longitudinal direction and the vertical direction as the transverse direction of the mower body; a cutting motor mounted to the body; the cutter assembly is arranged on the machine body and driven by the cutting motor, and comprises a first unit and a second unit, the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit; the mower further comprises an upper barrier forming protection against the cutter assembly in the longitudinal direction and/or the transverse direction; the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.

In one embodiment, the first unit includes a first blade including a laterally extending body extending outwardly with a plurality of spaced-apart serrated blades.

In one embodiment, the first unit is in at least partial contact with the second unit.

In one embodiment, the second unit comprises a second blade.

In one embodiment, the second blade is separate from or integrally formed with the lower shield

In one embodiment, the back and forth motion comprises a translational back and forth or oscillatory motion.

In one embodiment, the lower shield has a gap of 8.6mm or less.

In one embodiment, the transverse width of the protection unit is less than or equal to 5mm.

In one embodiment, the distance from the lower shield to the ground increases from inside to outside in the longitudinal direction.

In one embodiment, the lower shield is fixed in position relative to the fuselage.

In one embodiment, the upper barrier includes an upper cover mounted to the fuselage.

In one embodiment, the cutter assembly faces a side in the longitudinal direction, the upper cover is spaced from the first unit by a distance of more than 80mm on the side, and an outer edge of the upper cover on the side is spaced from the ground by a distance of less than 35mm.

In one embodiment, the distance of the upper cover from the first unit on the one side is less than 80mm, and/or the first unit exceeds the upper cover on the one side, and/or the distance of the outer edge of the upper cover on the one side from the ground is more than 35mm.

In one embodiment, the upper cover is less than 80mm from the first unit in the lateral direction, and/or the upper cover is more than 35mm from the ground at the outer edge in the lateral direction.

In one embodiment, the cutter assembly faces a direction in the longitudinal direction in which the lower shroud extends beyond the first unit.

In one embodiment, the lower shroud lateral width is greater than the first unit.

In one embodiment, the lower shield is installed at left and/or right sides of the first unit in a lateral direction.

In one embodiment, the transverse width of the lower shield is greater than or equal to 52 mm.

In one embodiment, the free end of the lower shield in the direction extends upwardly, vertically higher than the first unit.

In one embodiment, the distance between the lower shield and the upper barrier in the vertical direction is less than or equal to 8.6 mm.

In one embodiment, the upper barrier comprises an upper shield mounted above the first unit, the upper shield comprising guard units, and gaps for grass to leak are formed between adjacent guard units.

In one embodiment, the guard units of the upper guard are substantially vertically coincident with the lower guard such that gaps between the guard units are cleared by grass.

In one embodiment, the cutter assembly faces a direction in the longitudinal direction in which the upper shroud exceeds the first unit.

In one embodiment, the distance between the free ends of the upper shield and the lower shield in the direction is less than or equal to 8.6 mm.

In one embodiment, the distance between the free ends of the upper shield and the lower shield in the direction is greater than 8.6mm and equal to or less than 12 mm.

In one embodiment, the distance between the free end of the upper shield and/or the lower shield in the direction and the first blade is greater than or equal to 57.9 mm.

In one embodiment, the upper shield and the lower shield are connected to each other at free ends in the direction.

The invention solves the other technical scheme adopted by the prior art and comprises the following steps:

an intelligent lawn mower that autonomously moves and works within a work area, the intelligent lawn mower comprising:

the intelligent mower comprises a main body, a main body and a control device, wherein the main body takes the advancing direction of the intelligent mower as the longitudinal direction of the main body, the direction perpendicular to the ground as the vertical direction of the main body, and the direction perpendicular to the longitudinal direction and the vertical direction simultaneously as the transverse direction of the main body; a cutting motor mounted to the body; the cutter assembly is arranged on the machine body and driven by the cutting motor, and comprises a first unit and a second unit, the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit; the intelligent mower further comprises an upper barrier forming protection to the cutter assembly in the longitudinal direction and/or the transverse direction; the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.

In one embodiment, the second unit comprises a second blade.

In one embodiment, the second blade is separate from or integrally formed with the lower shroud.

In one embodiment, the lower shield has a gap of 8.6mm or less.

The invention solves the problem of the prior art and adopts another technical scheme that:

a cutter assembly removably mountable to a lawn mower, said cutter assembly comprising: the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit; the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.

In one embodiment, the second unit comprises a second blade.

In one embodiment, the cutter assembly further comprises an upper shield, the upper shield comprises a plurality of protection units, and gaps for grass to leak are formed between adjacent protection units.

In one embodiment, the guard units of the upper guard and the guard units of the lower guard substantially vertically coincide such that gaps between the guard units are crossed by grass.

In one embodiment, the lower shield has a gap of 8.6mm or less.

Compared with the prior art, the invention has the beneficial effects that: the scissor type cutter with large cutting area is used, so that the cutting area of the mower in unit time is larger, and the cutting efficiency is higher; and can cut regional boundary and barrier edge more high-efficiently, through setting up protector for scissors formula cutter setting can all prevent hand, foot or child's arm accidental contact to the blade of motion in the three-dimensional direction in the all positions of lawn mower.

Drawings

The above objects, technical solutions and advantages of the present invention can be achieved by the following drawings:

fig. 1 is a schematic view of a lawnmower according to a first embodiment of the present invention.

Fig. 2 is an exploded view of a cutting module and a shroud according to a first embodiment of the present invention.

Fig. 3 is an exploded view of a cutting module and a shroud according to a second embodiment of the invention.

Fig. 4 is a schematic view of a mower according to a sixth embodiment of the present invention.

Fig. 5 is a cross-sectional view of a mower according to a fourth embodiment of the present invention.

Fig. 6 is a schematic view of a mower according to a fifth embodiment of the present invention.

Fig. 7 is a schematic view of a cutting module and a shroud according to a sixth embodiment of the invention.

Description of the reference numerals

100. A mower; 110. a cutting module; 112. a first blade; 114. a second blade; 120. a lower shield; 122. a protection unit; 130. an upper shield; 10. a body; 20. a walking module; 30. and (7) covering.

Detailed Description

The following detailed description and technical contents of the present invention are described with reference to the accompanying drawings, however, the accompanying drawings only provide references and explanations, and do not limit the present invention.

The invention provides a mower, which is shown in figure 1. In this embodiment, the lawn mower 100 is an intelligent lawn mower. The lawn mower 100 includes a body 10, traveling modules 20 installed at both sides of the body 10, a cutting motor (not shown) installed inside the body 10, a cutting module 110 installed at the body 10 and driven by the cutting motor, a control module (not shown) controlling the lawn mower 100 to automatically operate and travel, and an energy source module (not shown) supplying energy. The present invention has been described with the advancing direction of the lawnmower 100 being the longitudinal direction of the main body 10, the direction perpendicular to the ground being the vertical direction of the main body 10, and the directions perpendicular to both the longitudinal direction and the vertical direction being the lateral direction of the main body 10. Of course, in other embodiments, the lawn mower 100 may be a manually operated lawn mower, such as a push mower or the like.

In one embodiment, the cutting motor is fixed to the body 10 and power is transmitted to the drive shaft using a reduction gear. The cutting module 110 is a scissors-type cutter including two cutting elements moving relatively, including a first blade 112, and transmits power with a driving shaft through an eccentric driving mechanism, so that the rotational motion of the driving shaft is converted into a reciprocating motion of the first blade 112.

The first blade 112 has a body extending in a transverse direction and extending forwardly of the body a plurality of spaced-apart serrated blades, each set comprising two oppositely-facing blades oriented generally perpendicular to the direction of reciprocation. Typically, the second blade 114 also includes a plurality of spaced sets of serrated cutting edges. The first blade 112 and the second blade 114 relatively move in a translational reciprocating motion in the transverse direction, and when the first blade 112 moves leftwards relative to the second blade 114, the cutting edge of the first blade 112 facing to the left side is staggered with at least one cutting edge of the second blade 114 facing to the right side; as the first blade 112 moves to the right relative to the second blade 114, the edge of the first blade 112 facing to the right is staggered with at least one edge of the second blade 114 facing to the left.

Traditional lawn mower's cutting module is a plurality of blades of installation on the blade disc, compares with the blade disc cutting module, and scissors formula cutter's effective work area is bigger, and cutting efficiency in the unit interval is higher.

Because conventional lawn mowers mow grass by the high speed movement of the blades relative to the lawn as the cutterhead rotates, and the cutting edges of the cutting blades are outward, the guard needs to be kept a certain distance from the blades to prevent damage to the cutting edges after contacting the blades. Therefore, even if the cutter head is offset, in practical application, the blades are far away from the protective device, the protective device is also far away from the upper cover, and the effect of finally cutting the edge is still not ideal. And the cutting edge of the scissors type cutter is inward, the distance between the protective cover and the cutter can be reduced, and the effect of cutting the side surface to the edge is improved. Further, the scissor cutter may be positioned at the forwardmost side of the mower to effect a front-side cut to the side, particularly around an obstacle in the work area, and the forward scissor cutter may also effect a substantial cut to the obstacle boundary.

The lawn mower 100 is generally operated in an unmanned manner to automatically cruise within a predetermined area, and a person or animal may accidentally insert a foot or a hand under the body to contact the cutting module 110, causing a safety problem. Especially when the machine goes out of the boundary or has a fault, the machine needs to be lifted up manually for charging or maintenance. In order to achieve operational safety, measures must be taken so that the hands and feet of the operator do not touch the cutting module in the operating condition of the mower 100 to prevent injury.

In order to meet the requirements of safe operation of the mower 100 in the working condition, it is necessary to protect it with a protection device, including the upper cover 30 or hood of the mower 100 itself, so that the cutting module 110 is inaccessible to the hands and feet of the adult, as well as to the arms of the child. The protection mode is that the upper cover 30 is utilized to ensure that the hand or the foot is close to the cutting module 110 to the limit, the cutting module 110 still cannot be contacted, namely, the distance between the upper cover 30 and the ground is balanced, and the distances between the cutting module 110 and the upper cover 30 are balanced; the protection means may also be a shield, which cannot extend from the guard into the cutting module even if a hand or a foot touches the guard, in case the gap of the shield is small enough and the thickness is large enough or it is far enough from the cutting module 110.

The upper cover 30 of the lawn mower 100 can have a plurality of different forms, the first is a case that the height from the ground is small enough to enable hands or feet to extend into a small part, at this time, if the distance between the outer side of the upper cover 30 and the cutting module 110 is more than or equal to the extending length, the contact can be avoided, and the protection grade of the upper cover 30 is defined as zero grade; if the distance between the outer side of the upper cover 30 and the cutting block 110 is less than the penetration length, the protection grade of the upper cover 30 is defined as one grade. The second is a large height from the ground, so that the hand or foot has a large length to be inserted into the cutting module 110, and the protection level of the upper cover 30 is defined as the second level. The third is that the height above the ground is too large, or the cutting module 110 exceeds the upper cover 30, at this time, the protection capability of the upper cover 30 is the weakest, and the safety requirement can be met only by the shield, and the protection grade of the upper cover is defined as three grades.

To avoid accidents, it is necessary that the operator's hands or feet, as well as the child's arms, do not accidentally reach the cutting module 110. The description herein uses the arms of a typical adult, a toddler, the adult hand comprising two portions, a first portion having a diameter of 12mm or less and a length of 80mm, and comprising two bendable joints, the second portion being directly separated from the first portion by a cut-off surface. The cutting module 110 may be touched by an adult in a carrying condition, and when fingers are inserted from the lower part of the upper cover 30, the stop surface will abut against the outer side of the upper cover 30. Therefore, as long as the distance between the outermost side of the upper cover 30 and the cutting module 110 is more than 80mm, the cutting module 110 can be prevented from being touched by fingers. The adult foot comprises three parts, the first part is 35mm in height and 50mm in width, the length of the part is 80mm, the second part is 35mm to 70mm in height and 70mm in width, so that the height of the upper cover 30 from the ground is less than 35mm while the above conditions are met, and thus the foot cannot extend into and reach the cutting module 110 from the lower part of the upper cover 30. The child's arm comprises three parts, a first part 8.6mm in diameter and 57.9mm in length, containing two bendable joints, and a second part 38.4mm in diameter and 101.6mm in length. Therefore, the height of the upper cover 30 is less than 35mm, and the distance between the cutting module 110 and the outer side of the upper cover 30 is more than or equal to 57.9mm, the cutting module 110 cannot be reached by the child's arm. That is, as long as the height of the upper cover is less than 35mm, and the distance between the cutting module 110 and the outside of the upper cover 30 is greater than or equal to 80mm, the safety requirement can be satisfied.

When the protection level of the upper cover 30 is one-level to three-level, a shield must be provided to satisfy the protection requirement, and the shield requirement in each case will be described in detail below.

As shown in fig. 4, the guard includes a lower guard 120 disposed below the cutting module 110, the lower guard 120 is composed of a plurality of guard units 122, and since the lower guard 120 is disposed in the cutting area of the cutting module 110, in order that the arrangement of the lower guard 120 does not affect the grass entering the cutting area, the guard units 122 are parallel to each other and substantially parallel to the advancing direction of the mower 100, and gaps for grass to leak are formed between the adjacent guard units 122. Generally, the larger the gap, the higher the grass feeding efficiency, and the smaller the gap, the lower the grass feeding efficiency. However, increasing the clearance results in an increased space for fingers to reach into, and therefore a balance needs to be found between operational safety and cutting efficiency. In the case where the gap between the guard units 122 is increased, it is necessary to simultaneously increase the thickness of the guard units 122 in the up-down direction or increase the distance between the guard units 122 and the cutting module 110.

The installation position of the cutting module 110 is different, and the arrangement of the lower shroud 120 needs to be changed accordingly. The form of the lower shroud 120 is determined according to the shortest distance of the cutting module 110 from the outside of the upper cover 30 in all directions, front, rear, left and right, and the height of the upper cover 30. In order to ensure operational safety at all cutting levels, it is necessary to take into account the highest and lowest height of the cutting module 110 from the ground and various adverse conditions for the operator.

When the height of the upper cover 30 from the ground is less than 35mm, which is equal to or less than the height of the cutting module 110 from the ground at the lowest cutting position, and the shortest distance between the cutting module 110 and the outer side of the upper cover 30 in any direction in the transverse direction or the longitudinal direction is less than 80mm, the lower shield 120 is required to be disposed in the corresponding direction in which the lower shield 120 is closer to the upper cover 30 than the cutting module 110. And the lower guard 120 has a lateral width such that when the cutting module 110 is in the lowest cutting position, the cut-off surface of the adult hand rests on the upper cover 30 and fingers of the hand extend toward the cutting module 110 and bend upward without touching the cutting module 110. In the lateral direction, if the distance from the left side of the cutting block 110 to the outside of the upper cover 30 is less than 80mm, the lower shield 120 is disposed at the lower left of the cutting block 110, and the left side of the lower shield 120 extends outward such that the lower shield 120 exceeds the cutting block 110 at the left side, and the leftmost shielding unit 122 of the lower shield 120 is closer to the upper cover 30 than the cutting block 110. In the longitudinal direction, if the distance between the cutting module 110 and the outside of the front upper cover 30 is less than 80mm, the transverse width of the lower shield 120 is equal to or greater than that of the cutting module 110. The free end of the front of the lower shroud 120 extends forward such that the longitudinal length of the lower shroud 120 is greater than the cutting module 110, i.e., the lower shroud 120 is closer to the upper cover 30 than the cutting module 110. Here, the protection level of the shield may be defined as one level.

When the height of the upper cover 30 from the ground is greater than the height of the cutting module 110 from the ground at the lowest cutting position, or greater than 35mm, and the shortest distance between the cutting module 110 and the outside of the upper cover 30 in any direction in the transverse or longitudinal direction is less than 80mm, the lower shield 120 is disposed below the cutting module 110 in the corresponding direction, and the lower shield 120 is closer to the upper cover 30 than the cutting module 110 in the direction. Further, in order to prevent the hand or foot from protruding from a position parallel to the cutting module 110 or from above the cutting module 110 when the cutting module 110 is located at the lowest cutting position, the free end of the lower shield 120 in the corresponding direction extends upward so that the lower shield 120 is close enough to the upper cover 30 that the hand or foot cannot protrude or protrude a distance short enough to contact the cutting module 110. The free end of the lower shield 120 means a left end and/or a right end thereof in a lateral direction, and the free end of the lower shield 120 means a front end and/or a rear end thereof in a longitudinal direction. As shown in fig. 7, if the cutting module 110 is spaced apart from the upper cover 30 on the left by less than 80mm, the shield unit 122 on the leftmost side of the lower shield 120 extends upward. Here, the protection level of the shield may be defined as two levels.

As shown in fig. 1 and 2, when the height of the upper cover 30 from the ground is too high or the cutting module 110 is beyond the protection range of the upper cover 30, the lower shroud 120 is disposed below the cutting module 110 in a corresponding direction, and the lower shroud 120 is closer to the upper cover 30 than the cutting module 110 in the direction. Similarly, an upper shield 130 is disposed above the cutting module 110, and the upper shield 130 is identical to the lower shield 120 in structure and the shielding units 122 correspond to one another. In the transverse direction, the free ends of the upper guard 130 and the lower guard 120 in the above-mentioned direction may be connected to form a closed side to prevent the hand or foot from contacting the cutting module 110 from the side. Of course, a gap may be provided on the side surface, as long as the distance between the gap and the side surface far from the cutting module 110 satisfies the condition that the finger cannot contact the cutting module 110, so that the grass is prevented from being squeezed by the shield 120 and/or the upper shield 130 when the edge is cut, and the effect of the edge is prevented from being damaged. In the longitudinal direction, if the height of the upper cover 30 from the ground is excessively large in front of the cutting module 110 or the cutting module 110 is disposed in front of the upper cover 30, both the upper shield 130 and the lower shield 120 have a greater lateral width than the cutting module 110. The upper shield 130 and the lower shield 120 may be independently provided if the space between the upper shield 130 and the free end in front of the lower shield 120 and the distance of the free end away from the cutting module 110 satisfy safety requirements. If the spacing is too large to meet the safety requirements, the free end forward of the upper shroud 130 extends downward and/or the free end forward of the lower shroud 120 extends upward so that the spacing forward of the upper shroud 130 and the lower shroud 120 and the distance away from the cutting module 110 meet the safety requirements. Further, the upper shield 130 and the free end of the front of the lower shield 120 may be integrally connected, i.e., the upper shield 130 and the lower shield 120 are integrally formed. Here, the protection level of the shield may be defined as three levels.

The first part of the child's arm has a diameter of 8.6mm and a length of 57.9mm, and the second part has a diameter of 38.4mm and a length of 101.6 mm. Therefore, if the clearance of the shield is less than 8.6mm, the child arm cannot extend into the shield; if the gap is greater than or equal to 8.6mm and less than 38.4mm, the distance of the shield from the cutting module must be greater than or equal to 57.9 mm. The first part of the adult hand has a corresponding length of 8.6mm and 8.6mm or less in diameter, the corresponding length of 71.4mm and 12mm or less in diameter, and the length and the width of the second part are respectively 50mm and 20 mm. Therefore, in order to ensure that the tip of the adult finger cannot extend, it is necessary to ensure that the distance between the free end of the shield and the cutting module is greater than or equal to 8.6mm when the gap is 8.6mm, and it can be understood that the minimum distance between the free end of the shield and the cutting module can be correspondingly reduced when the gap is any value less than 8.6 mm. Therefore, if the finger of the adult and the finger of the child cannot be inserted, the condition 1: the clearance is less than or equal to 8.6 mm. If the gap is 8.6mm, the distance must be greater than or equal to 8.6mm, and if the gap is reduced, the minimum distance can be correspondingly reduced; or satisfies condition 2: the gap is more than 8.6mm and less than 12mm, and the distance is more than or equal to 57.9 mm; or satisfies condition 3: the clearance is more than 12mm and less than 20mm, and the distance is more than or equal to 80 mm. It will be appreciated that the basis for these conditions is that the shield is not deformed when subjected to a certain degree of force, and if the shield is deformed after being subjected to a force, the gap is reduced or the distance is increased to compensate for the deformation that may occur.

It is understood that the lower shroud 120 needs to satisfy condition 1 because the lowest cutting position of the cutting module 110 is generally not greater than 57.9 mm. However, the upper shield 130 is disposed above the cutting module 110, and when the cutting module 110 is mounted in front of the body 10 without being protected by the upper cover 30, the structure of the upper shield 130 is not affected by the cutting position, and may be arbitrarily disposed in a state where the condition 1 or the condition 2 or the condition 3 is satisfied. Alternatively, the guard unit 122 of the upper guard 120 may be reduced in lateral width to increase its distance away from the cutting module 110, which facilitates grass discharge. It is understood that the protection units 122 of the upper shield 130 and the lower shield 120 may not correspond to each other as long as the installation and safety requirements are satisfied.

If the upper guard 130 and the lower guard 120 are independently installed, when the distance between the front free ends of the upper guard 130 and the lower guard 120 is less than or equal to 8.6mm, the distance between the front free ends and the cutting module 110 satisfies the above condition 1; when the interval between the front free ends of the upper shield 130 and the lower shield 120 is greater than 8.6mm and less than 12mm, the distance between the front free ends and the cutting module 110 must satisfy condition 2; when the interval between the front free ends of the upper shield 130 and the lower shield 120 is greater than 12mm and less than 20mm, the distance between the front free ends and the cutting module must satisfy condition 3. If the interval between the upper shield 130 and the lower shield 120 is large, the front free ends of the upper shield 130 and the lower shield 120 may be connected, respectively, to be protected by combining the distance between the front free end and the cutting module 110 through the original gap. Of course, the specific values referred to in the present invention may be increased or decreased by a certain margin according to the actual size.

It will be appreciated that in order to further increase safety, where the shield has a lower level of protection, a higher level of protection may be provided, and any combination may be used as long as the safety requirements are met. For example, when the upper cover protection grade is zero grade, no shield or any grade of shield can be arranged; when the protection grade of the upper cover is first grade, the protection grade of the protective cover is first grade, second grade or third grade; when the protection grade of the upper cover is two grades, the protection grade of the protective cover is two grades or three grades; when the upper cover protection grade is three-grade, the shield protection grade must meet the requirement of three-grade.

In one embodiment, the upper barrier of the lawn mower 100 may include only the upper cover 30 when the upper cover 30 has a strong protection capability, and the upper barrier of the lawn mower 100 may include the upper cover 30 and the upper guard 130 when the upper cover 30 has a weak protection capability.

In one embodiment, the cutter assembly includes a first unit including the first blade 112 and a second unit including the lower guard 120, and the first blade 112 and the lower guard 120 interfere with each other and reciprocate. In other embodiments, the second unit further includes a second blade 114, and the first blade 112 and the second blade 114 collide with each other and reciprocate.

In a first embodiment of the present invention, as shown in fig. 1 and 2, in order to optimize the effect of cutting to the edge, a cutting module 110 is disposed in front of the body 10 without being protected by the upper cover 30 in each of the lateral and longitudinal directions. This requires the guard to be in all directions so that the cutting module 110 is not accessible to the hands or feet.

In this embodiment, the mower 100 employs a reciprocating scissor cutter, the first blade 112 is a moving blade, and the lower guard 120 is a stationary blade, and abuts against the first blade 11. Since the lower shroud 120 is stationary relative to the fuselage 10, the lower shroud 120 is both part of the cutting module 110 and can serve as a shroud.

Since the guard of the conventional lawn mower needs to be spaced apart from the blades, when the cutting module 110 is located at the lowest cutting height, the thickness of the guard in the height direction must be sufficiently small in order for the guard to not contact the ground in a normal state, and the width thereof in the width direction must be sufficiently large in order to secure the strength of each combing tooth of the guard. Therefore, the grass leaking space of the protective device is small, the grass combing efficiency of the protective device is low, the distance between the protective device and the ground is too small, and grass is easily ground under the condition that the ground is uneven.

In this embodiment, the lower guard 120 functions as both a stationary knife and a guard, that is, the protection unit 122 of the lower guard 120 can be used as both a guard and a knife edge. The inaccessible cutting module is therefore referred to herein primarily as the first blade 112, and the lower guard 120 is accessible. Thus, the lower guard 120 is in direct contact with the first blade 112 at a distance sufficiently small to correspondingly increase the thickness of the guard 120 in the vertical direction. Further, in order to reduce grass grinding problems, and at the same time, to allow grass in the cutting zone to be cut more efficiently, the lateral width of the guard unit 122 may be correspondingly reduced. As long as the thickness and width of the lower shield 120 are balanced with each other to meet the strength requirement. Thus, the contact area of the lower guard 120 with the grass surface is reduced, and for the lower guard 120 having the same lateral width, reducing the width of each guard unit 122 increases the grass inlet gap, increases the possibility of grass entering the cutting area, and thus improves the grass cutting efficiency. In this embodiment, the gap of the lower shield 120 is 5.5mm, and the thickness of the protection unit 122 is 4 mm. To avoid the mower 100 from digging into uneven ground, the height of the lower guard 120 from the ground increases gradually from the rear to the front. This can both ensure the strength of each guard unit 122 of the lower guard 120 and reduce the influence of the lower guard 120 on the movement of the mower 100.

In this embodiment, the upper shield 130 is disposed above the first blade 112, and in order to avoid the influence of the upper shield 130 on the movement of the first blade 112, the upper shield 130 is spaced from the first blade 112. The lower shield 120 and the upper shield 130 are in one-to-one correspondence with the shielding units 122 in the vertical direction, and the free end of the front of the upper shield 130 extends downward, and the upper shield 130 is butted against the free end of the front of the lower shield 120 to form an approximately U-shaped shield. The free end of the front of the upper guard 130 is spaced 4mm from the first blade 112, and the guard units 122 at the leftmost and rightmost sides of the upper guard 130 are spaced 4mm from the first blade 112 in the lateral direction. In this embodiment, the upper shield 130 is installed independently of the lower shield 120. In other embodiments, the upper shield 130 and the lower shield 120 may be integrally formed.

In this embodiment, the rear side of the cutting module 110 is mounted on the machine body 10, and the tooth-shaped blade faces the advancing direction of the lawn mower 100, and since the rear side can be protected to a certain extent by the machine body 10, both rear sides of the cutting module 110 are closed. It will be appreciated that in other embodiments the guard behind the cutting module 110 may take different forms, as long as the safety requirements are met.

Thus, when the adult hand approaches in parallel from above or in front of the cutting module 110, the distance that the tip of the finger can extend is 3.9mm because the gap of the upper shield 130 is 5.5mm, and the finger does not touch the first blade 112 because the free end in front of the upper shield 130 is 4mm from the first blade 112 in this embodiment. If the child arm is approached in parallel from the front of the cutting module 110, the diameter of the first portion thereof is 8.6mm, which is larger than the gap of the upper guard 130, and thus cannot extend into the upper guard 130, further failing to reach the first blade 112. Similarly, if the cut-off surface of the adult hand abuts the side of the upper guard 130 during transport, fingers extend from the lower surface of the lower guard 120 and bend upward at the terminal end of the lower guard 120, the first blade 112 is likewise inaccessible to the fingertips.

The lower guard 120 and/or the upper guard 130 are made of a lightweight material, in this embodiment, the upper guard 130 is made of a nylon material, and the first blade 112 and the second blade 120 are also made of a lightweight metal, in this embodiment, high-speed steel, so that the overall weight of the lawn mower 100 is reduced. In the embodiment, the cutting module 110 is installed in front of the body 10, and the light material is adopted to prevent the gravity center from moving forward seriously to affect the operation of the mower 100. Of course, in other embodiments, other materials may be used for both the guard and the blade.

In the second embodiment of the present invention, as shown in fig. 3, the structure of the lower guard 120 is substantially the same as that of the first embodiment, except that the upper guard 130 is spaced apart from the first blade 112 in the vertical direction by an increased distance, so that cut grass clippings are prevented from being caught between the first blade 112 and the upper guard 130 to affect cutting, and the outermost side of the upper guard 130 is spaced apart from the first blade 112 by a distance of 30mm, so that the grass clippings can smoothly leak through the gap between the guards 120.

In a third embodiment of the present invention, the main structure of the lower guard 120 is substantially identical to that of the first embodiment, except that the cutter assembly further comprises a second blade 114, in this embodiment, the first blade 112 and the second blade 114 constitute a scissor cutter. The lower guard 120 and the second blade 114 are separate structures, and the lower guard 120 is disposed below the second blade 114, and may or may not be in direct contact with the second blade 114.

In a fourth embodiment of the present invention, as shown in fig. 5, the main structure of the lawn mower 100 is substantially identical to that of the first embodiment except that the cutting module 110 is located inside the upper cover 30 in the longitudinal and lateral directions. In order to realize the edge cutting, the distance between the cutting module 110 and the upper cover 30 in the front and left and right directions is less than 80mm, the height of the upper cover 30 in front of the cutting module 110 is 50mm, and the height of the upper covers 30 in both lateral directions is 35mm.

In this embodiment, the lower guard 120 is provided separately from the cutting module 110, and the cutting module 110 includes a first blade 112 and a second blade 114. The lower guard 120 extends upwardly on the front side of the second blade 114, and the extension of the lower guard 120 is similar in structure to the lower side of the second blade 114, with a gap of 5.5mm and a thickness of 4 mm. In other embodiments, the thickness of the extension may increase or decrease, but it must be sufficient that the free end below the lower guard 120 is spaced from the second blade 114 by a distance of 3.9mm or more. The purpose of the upward extension of the lower shroud 120 is to keep the lower shroud 120 close enough to the upper cover 30 that fingers cannot reach into or a certain distance but not to touch the cutting module 110 when the cutting module 110 is in the lowest cutting position. In this embodiment, the distance between the lower shroud 120 and the upper cover 30 in the vertical direction is 8.5mm when the cutting module 110 is located at the lowermost cutting position.

When the cutting module 110 is located at the lowest cutting position, the upper cover 30 cannot cover the cutting module 110 at the left or right side of the cutting module 110, and the lower shroud 120 must extend upward at the outermost side in order to avoid fingers from reaching the cutting module 110 in the direction of the left or right side of the mower 100. In this embodiment, the lower shroud 120 is vertically spaced from the upper cover 30 by 8.5mm when the cutting module 110 is in the lowermost cutting position.

Thus, when the hands of an adult or a child are approached in parallel from the front or the left-right direction of the cutting module 110, the gap and the thickness of the lower shield 120 are such that fingers cannot reach the cutting module, similar to the third embodiment. When an adult hand or a child's arm is inserted between the lower shield 120 and the upper cover 30, since the distance between the lower shield 120 and the upper cover 30 is 8.5mm, the length that the adult hand can be inserted is about 8.5mm, and the thickness of the guard unit 122 of the lower shield 120 is 4mm, the length of the movable portion of the finger at the rear side of the lower shield 130 is only 4.5mm, and it cannot be bent downward, so that the finger cannot touch the cutting module 110. The fingers of the children are 8.6mm in diameter and cannot extend into the fingers. The size of each part of the adult foot is larger than 8.5mm, and the cutting module 110 can not be reached, and the detailed description is omitted.

In a fifth embodiment of the present invention, as shown in fig. 6 and 7, the main structure of the lawnmower 100 is substantially identical to the fourth embodiment, except that the cutting module 110 is mounted between the front and rear wheels, offset to the left of the body 10. The height of the upper cover 30 from the ground is less than 35mm, and the shortest distance between the cutting module 110 and the outermost side of the front upper cover 30 is more than or equal to 80 mm; in the transverse direction, the distance between the cutting module 110 and the right upper cover 30 is greater than 80mm, and the distance between the cutting module 110 and the left upper cover 30 is less than 80 mm.

In this embodiment, the lower shield 120 is required to be disposed below the left side of the cutting module 110. Since the lower guard 120 is not integrally disposed below the cutting module 110, the lower guard 120 in this embodiment is independent of the second blade 114 for ease of implementation. The vertical thickness of the guard unit 122 of the lower guard 120 is set to 8.5mm, the gap is set to 8mm, and fingers of an adult can be inserted into the gap but with a length of less than 8.5mm, so that the lower guard 120 functions only to prevent a hand or foot from being inserted into the contact cutting module 110 from a lateral left or right direction. The lower guard 120 is disposed on the left side below the cutting module 110, and the width of the lower guard 120 is required to prevent fingers from accidentally entering the cutting module 110 when an operator lifts the mower 100. In this embodiment, the width of the single lower shield 120 is 52 mm. It will be appreciated that in other embodiments, if the thickness of the guard unit 122 is reduced, the width of the lower shield must be correspondingly increased.

Thus, when the feet of the adult approach in parallel from the front or the left side of the cutting module 110, since the height of the upper cover 30 from the ground is less than 35mm, the longest distance that the feet can protrude from below the upper cover 30 is 80mm, and the distance between the cutting module 110 and the upper cover 30 is greater than 80mm, the feet cannot touch the cutting module 110. When the adult foot approaches in parallel from the left side of the cutting module 110, since the distance between the outermost side of the lower shield 120 and the upper cover 30 in the vertical direction is 8.5mm and the minimum height of the adult foot is 35mm, the foot cannot be inserted. During handling of the machine, on the left side, the cut-off face of the hand rests against the guard unit 122 on the left side of the lower guard 120, and if fingers extend inwardly along the lower surface of the lower guard 120 and bend the fingers upwardly at the free end of the lower guard 120, the fingers cannot reach the cutting module 110 due to the guard width of 52 mm. On the right, the cut-off face of the hand rests on the upper cover 30, extending inwards by a maximum distance of 80mm, whereas the upper cover 30 is at a distance of more than 80mm from the cutting module 110, so that the cutting module 110 is not accessible by fingers.

In a sixth embodiment of the present invention, as shown in fig. 4, the main structure of the lawn mower 100 is substantially identical to that of the fifth embodiment except that the cutting module 110 is not offset to one side and is spaced apart from the left and right upper covers 30 by less than 80mm in the lateral direction. In this embodiment, only the lower shields 120 are disposed on the left and right sides of the lower portion of the cutting module 110, and the structure of the lower shield 120 is similar to that of the fifth embodiment and is not described herein again. It is understood that in other embodiments, the second blade 114 and the lower shield 120 may be integrally formed.

In the seventh embodiment of the present invention, the main structure of the mower 100 is substantially the same as that of the fourth embodiment except that the cutting module 110 is installed between the front wheel and the rear wheel, the height of the upper cover 30 from the ground is less than 35mm, and the distance between the outermost side of the upper cover 30 and the cutting module 110 is equal to or greater than 80 mm. In this case, the protection device is the upper cover 30, and when the hands and feet are inserted from the upper cover 30, the cutting module 110 is not touched due to the distance. In order to prevent the upper cover 30 from pressing grass, a plurality of grass combing pieces which are parallel to each other and parallel to the advancing direction are arranged on the upper cover 30 in front of the cutting module 110, so that grass is combed through a grass combing channel before entering the grass cutting assembly to be cut, and the grass is cut after being combed in order, and the grass cutting efficiency is improved.

In the eighth embodiment of the present invention, the main structure of the mower 100 is substantially identical to that of the third embodiment, except that the first blade 112 and the second blade 114 are connected to the drive shaft through an eccentric transmission mechanism, so that the rotational motion of the drive shaft is converted into the relative reciprocating motion of the first blade 112 and the second blade 114. The drive shaft mounts an eccentric and the first blade 112 and the second blade 114 are fixed at different positions on the eccentric. When the eccentric wheel rotates, the first blade 112 and the second blade 114 perform a relative reciprocating motion. Since the second blade 114 moves during operation, a certain distance is required between the guard 120 and the second blade 114 in order to prevent the guard 120 from affecting the movement of the second blade 114.

In a ninth embodiment of the invention, the main structure of the mower 100 is substantially identical to the third embodiment, except that the cutting module further comprises a third blade not driven by the cutting motor, which is in direct contact with the first blade 112 and is integrally formed with the upper guard 130, i.e. the third blade 130 acts as both a stationary blade and a guard. In this embodiment, since the interval between the upper guard 130 and the lower guard 120 is only the thickness of the first blade 112, the upper guard 130 and the lower guard 120 extend forward by a certain length to meet the safety requirements.

In a tenth embodiment of the present invention, the first blade 112 may be a stationary knife that is not driven by the cutting motor, and the second blade 114 reciprocates relative to the first blade 112. In this embodiment, the first blade 112 and the upper guard 130 may be independent from each other, or the upper guard 130 may be used as a stationary knife, and the second blade 114 and the guard 120 have a certain distance.

In the eleventh embodiment of the present invention, the main structure of the mower is substantially the same as that of the first embodiment, except that the first blade 112 and the second blade 114 can perform reciprocating swing relative to the rotation of the eccentric transmission mechanism, and the cutting is realized by the moving contact of the blades of the first blade 112 and the second blade 114 which are opposite in direction.

In the twelfth embodiment of the present invention, the structure of the cutter member may be substantially the same as any one of the first to eleventh embodiments. The cutter assembly generally includes a first blade 112 and a lower guard 120, and may also include a second blade 114, and/or an upper guard 130, as desired, with the exception that the cutter assembly further includes a detachable mounting structure to enable the cutter assembly to be detachably mounted to the mower for user selection of mounting to the mower 100 to enable the mower 100 to perform mowing or trimming tasks within a work area. The knife assembly may also include a drive motor that the user drives either the first blade 112 or the second blade 114.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

A lawn mower, comprising:

the mower comprises a mower body, a mower body and a control device, wherein the mower body takes the advancing direction as the longitudinal direction of the mower body, takes the direction vertical to the ground as the vertical direction of the mower body, and takes the direction vertical to the longitudinal direction and the vertical direction as the transverse direction of the mower body;

a cutting motor mounted to the body;

the cutter assembly is arranged on the machine body and driven by the cutting motor, and comprises a first unit and a second unit, the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit;

it is characterized in that the preparation method is characterized in that,

the mower further comprises an upper barrier forming protection against the cutter assembly in the longitudinal direction and/or the transverse direction;

the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.
The mower of claim 1, wherein said first unit includes a first blade including a laterally extending body extending outwardly with a plurality of spaced apart serrated edges.
The mower of claim 1, wherein said first unit is in at least partial contact with said second unit.
The mower of claim 1, wherein said second unit comprises a second blade.
The mower of claim 4, wherein the second blade is separate from or integrally formed with the lower guard.
The lawnmower of claim 1, wherein the back and forth motion comprises a translational back and forth or an oscillating motion.
The mower of claim 1, wherein the clearance of the lower guard is 8.6mm or less.
The mower of claim 1, wherein the guard unit has a lateral width of 5mm or less.
The mower of claim 1, wherein the lower guard increases in longitudinal distance from the ground.
The lawnmower of claim 1, wherein the lower shroud is fixed in position relative to the main body.
The mower of claim 1, wherein said cutter assembly faces in a direction in said longitudinal direction, said lower guard extending beyond said first unit in said direction.
The mower of claim 11, wherein said lower guard has a greater lateral width than said first unit.
The mower of claim 11, wherein said lower guard is mounted to the left and/or right side of said first unit in the lateral direction.
The mower of claim 11, wherein the lower guard has a lateral width of 52mm or greater.
A lawnmower as claimed in claim 11, wherein the free end of the lower shroud in said direction extends upwardly, vertically higher than the first unit.
The mower of claim 11, wherein the lower shroud is vertically less than or equal to 8.6mm from the upper barrier.
The lawnmower of claim 1, wherein the upper barrier comprises an upper cover mounted to the body.
The mower of claim 1, wherein said upper barrier comprises an upper shield mounted above said first unit, said upper shield including guard units, adjacent guard units defining gaps therebetween through which grass may escape.
The mower of claim 18, wherein the guard units of the upper guard are substantially vertically coincident with the lower guard such that gaps between the guard units are cleared by grass.
The mower of claim 18, wherein said cutter assembly faces in a direction in said longitudinal direction, said upper guard extending beyond said first unit in said direction.
The mower of claim 20, wherein the distance between the free ends of the upper and lower shrouds in the direction is 8.6mm or less.
The mower of claim 20, wherein the distance between the free ends of the upper and lower shrouds in the direction is greater than 8.6mm and equal to or less than 12 mm.
The mower of claim 22, wherein a free end of the upper and/or lower guard in the direction is greater than or equal to 57.9mm from the first blade.
The mower of claim 20, wherein said upper guard and said lower guard are interconnected at free ends in said direction.
An intelligent lawn mower that autonomously moves and works within a work area, the intelligent lawn mower comprising:

the intelligent mower comprises a main body, a main body and a control device, wherein the main body takes the advancing direction of the intelligent mower as the longitudinal direction of the main body, the direction perpendicular to the ground as the vertical direction of the main body, and the direction perpendicular to the longitudinal direction and the vertical direction simultaneously as the transverse direction of the main body;

a cutting motor mounted to the body;

the cutter assembly is arranged on the machine body and driven by the cutting motor, and comprises a first unit and a second unit, the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit;

it is characterized in that the preparation method is characterized in that,

the intelligent mower further comprises an upper barrier forming protection to the cutter assembly in the longitudinal direction and/or the transverse direction;

the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.
The intelligent mower of claim 25, wherein said first unit comprises a first blade comprising a laterally extending body extending outwardly with a plurality of spaced apart serrated cutting edges.
The intelligent mower of claim 25, wherein the second unit comprises a second blade.
The intelligent mower of claim 27, wherein the second blade is separate from or integrally formed with the lower guard.
The intelligent mower of claim 25, wherein the clearance of the lower guard is 8.6mm or less.
The intelligent mower of claim 25, wherein the guard unit has a lateral width of 5mm or less.
The intelligent mower of claim 25, wherein the upper barrier comprises an upper cover mounted to the main body.
The intelligent mower of claim 25, wherein the upper barrier comprises an upper shield mounted above the first unit, the upper shield comprising guard units, and wherein gaps are formed between adjacent guard units for grass to escape.
A cutter assembly removably mountable to a lawn mower, said cutter assembly comprising:

the first unit and the second unit move back and forth relatively to cut grass, and the second unit is positioned below the first unit;

it is characterized in that the preparation method is characterized in that,

the second unit comprises a lower shield, the lower shield comprises a plurality of protection units, and gaps for grass to leak are formed between the adjacent protection units.
The cutter assembly of claim 33, wherein said first unit includes a first blade including a laterally extending body extending outwardly therefrom a plurality of spaced apart serrated cutting edges.
The cutter assembly of claim 33, wherein the second unit comprises a second blade.
The cutter assembly of claim 35, wherein the second blade is separate from or integrally formed with the lower guard.
The cutter assembly of claim 33, further comprising an upper shroud, the upper shroud comprising a plurality of guard cells, adjacent guard cells defining gaps therebetween through which grass may escape.
The cutter assembly of claim 37, wherein the guard units of the upper shroud and the guard units of the lower shroud are substantially vertically coincident such that gaps between the guard units are cleared by grass.
The cutter assembly of claim 33, wherein the clearance of the lower shroud is 8.6mm or less.
The cutter assembly of claim 33, wherein the guard unit has a lateral width of 5mm or less.