CN218007056U - Grass cutter - Google Patents

Abstract

The application discloses a grass mower, which comprises a base plate, a first blade and a second blade, wherein the first blade and the second blade are suitable for relative movement; at least two supporting points arranged along the width direction of the first blade are arranged between the first blade and the second blade on the bottom plate, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly propped; and the tail end of the first blade is lifted up to form an included angle alpha with the second blade, wherein the alpha is more than 0 degree and less than or equal to 10 degrees. The middle end of the first blade is limited by the pressing of the fixing component, and the tail end of the first blade is jacked up by the supporting point, so that the blade part of the first blade can tightly abut against the blade part of the second blade, automatic grinding is realized, in addition, the friction between the first blade and the second blade can be reduced, the endurance time is prolonged, and the two sides of the first blade are more balanced in stress by arrangement in the width direction of the first blade.

Description

Grass cutter

Technical Field

The application relates to the technical field of gardening tools, in particular to a grass cutter.

Background

The grass mower is a commonly used electric garden tool, and the rotation of a motor is controlled by a main switch of a handle, so that the reciprocating cutting motion of a blade is driven, the cutting motion of scissors is simulated, and the purpose of cutting grass or branches is achieved.

However, the blade structure inside the conventional lawnmower has the following drawbacks: after long-time use, the condition of curled edge can appear to cause the reduction of grass cutting efficiency, and dismantle the blade and go to grind again, also comparatively inconvenient.

Disclosure of Invention

The application aims to provide a grass mower with a grinding function.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a grass cutting knife comprises a base plate, a first blade and a second blade, wherein the first blade and the second blade are suitable for relative movement; at least two supporting points arranged along the width direction of the first blade are arranged between the first blade and the second blade on the bottom plate, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly abutted; and an included angle alpha is formed between the tail end of the first blade and the second blade after the tail end of the first blade is lifted, wherein alpha is larger than 0 degree and is less than or equal to 10 degrees.

Preferably, 1 DEG. Ltoreq. Alpha. Ltoreq.5 deg.

As another preference, α =3 °.

Further preferably, the first blade is adapted to be connected to an external driving device and swing under the driving of the external driving device, the second blade is adapted to be fixedly disposed on the bottom plate, and blade portions of the first blade and the second blade are adapted to repeatedly intersect and separate. The structure is used for realizing single-acting grass cutting.

Further preferably, the tail end of the second blade is provided with an installation part protruding outwards, and the installation part is suitable for being inserted into the bottom plate, so that the second blade is fixedly arranged on the bottom plate. The structure is used for realizing the fixation of the second blade.

Further preferably, the number of the supporting points is two, and the two supporting points are horizontally and symmetrically arranged on two sides of the first blade.

Preferably, a first supporting block and a second supporting block are respectively arranged on the tail end of the bottom plate on two sides of the first blade in the width direction, the first supporting block and the second supporting block are both arranged between the first blade and the second blade, and the top ends of the first supporting block and the second supporting block are respectively provided with one supporting point.

Preferably, the tail end of the base plate is provided with a guide sleeve, the first support block and the second support block are respectively arranged at two ends of the guide sleeve in the width direction of the first blade, and the first support block and the second support block are suitable for pressing down the second blade.

Preferably, a guide sleeve is arranged at the tail end of the bottom plate, and the first blade is sleeved on the guide sleeve, so that the guide sleeve is suitable for swinging together with the first blade; the cutter blade is characterized in that a first supporting block and a second supporting block are arranged on the guide sleeve, at least one of the first supporting block and the second supporting block is provided with a limiting protrusion at the bottom end, the second blade is provided with a guide groove with an arc-shaped structure, the limiting protrusion is suitable for being inserted into the guide groove, and the limiting protrusion and the guide groove are matched to limit the relative rotation range of the first blade and the second blade. The above structure is used for limiting the relative rotation range of the first blade and the second blade.

Further preferably, the fixing assembly comprises a positioning ring which is fixedly arranged, the top end of the positioning ring is provided with a limiting portion which protrudes outwards, the bottom end of the limiting portion abuts against the top end of the second blade, and the first blade is sleeved outside the limiting portion.

Preferably, the fixing assembly further comprises a locking screw, a limiting nut and a pressing plate, the pressing plate is arranged at the top end of the positioning ring, and the locking screw is suitable for penetrating through the pressing plate and the positioning ring, then penetrating through the bottom plate to be connected with the limiting nut, and is suitable for limiting the movement of the positioning ring by pressing the pressing plate; and the pressure plate is suitable for extending out of the limiting part and limiting the first blade to longitudinally move to be separated from the positioning ring. The structure is used for realizing the fixed arrangement of the positioning ring and the pressing plate.

In another embodiment, the first blade and the second blade are both adapted to be connected to an external driving device and driven by the external driving device to swing, and the blade portions of the first blade and the second blade are adapted to repeatedly intersect and separate. The above structure is used to realize double-acting grass cutting.

Compared with the prior art, the beneficial effect of this application lies in:

the technical means that at least two supporting points are arranged in the width direction of the first blade is arranged between the first blade and the second blade, the middle end of the first blade is limited by the downward pressing of the fixing component, and the tail end of the first blade is jacked up by the supporting points, so that a downward movement trend can be formed at the front end of the first blade, the blade part of the first blade is tightly abutted to the blade part of the second blade, automatic grinding is realized when the first blade and the second blade perform relative reciprocating angular movement, and in addition, the tail end of the first blade is jacked up, so that the friction between the first blade and the second blade can be reduced, the current is reduced, the endurance time of the whole machine is prolonged, and the two sides of the first blade are more balanced in stress due to the arrangement in the width direction of the first blade.

Drawings

FIG. 1 is a schematic structural view of a lawnmower blade according to the present application;

FIG. 2 is an exploded view of the present lawnmower blade;

FIG. 3 is a top view of the present application's grass trimmer;

FIG. 4 is a cross-sectional view of the present grass mower;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a schematic structural view of a guide sleeve in the grass mower of the present application;

fig. 7 is a schematic structural view of a second blade of the grass mower of the present application.

In the figure: 1. a base plate; 2. a first blade; 21. a first blade part; 3. a second blade; 31. a second blade section; 32. an installation part; 33. a guide groove; 4. a guide sleeve; 41. a first support block; 42. a second support block; 43. a limiting bulge; 5. a fixing assembly; 51. positioning rings; 511. a limiting part; 52. locking the screw; 53. a limit nut; 54. and (7) pressing a plate.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments described below or between the technical features may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations and positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 and 7, the preferred embodiment of the present application is:

a grass cutter comprises a base plate 1 and a first blade 2 and a second blade 3 which are suitable for moving relatively, wherein a fixing component 5 is arranged on the base plate 1, and the fixing component 5 is suitable for pressing the middle ends of the first blade 2 and the second blade 3 downwards and limiting the movement of the first blade 2 and the second blade 3; at least two supporting points arranged along the width direction of the first blade 2 are arranged between the first blade 2 and the second blade 3 on the bottom plate 1, and the supporting points are suitable for jacking the tail end of the first blade 2 so as to enable the blade parts at the front ends of the first blade 2 and the second blade 3 to be tightly abutted; and an included angle alpha is formed between the tail end of the first blade 2 and the second blade 3 after the tail end of the first blade is lifted, wherein alpha is more than 0 degree and less than or equal to 10 degrees.

The same as the traditional technical scheme, the first blade 2 and the second blade 3 of this embodiment are also arranged side by side, and are arranged on the bottom plate 1 through the fixing component 5, and the blade parts of the first blade 2 and the second blade 3 can be repeatedly crossed and kept away from each other, so as to cut grass.

The inventor of the present application has found that to achieve automatic grinding, it is only necessary to achieve that the blade portions of the first blade 2 and the second blade 3 are tightly abutted together during grass cutting, and the first blade 2 and the second blade 3 can automatically cut or flatten the curled edge during relative reciprocating angular movement. However, if the fixing effect of the fixing assembly 5 is simply increased so that the first blade 2 and the second blade 3 are pressed tightly together, a serious problem occurs: the first blade 2 and the second blade 3 are integrally abutted together, so that the friction is large during relative angular movement, the power is increased when the two blades are driven to move in relative angles, the current is increased, the endurance time of the whole machine is reduced, and the cost is increased.

Therefore, the inventors of the present application made further improvements: because the part of realizing automatic grinding is the front end of two blades, only need realize two blade front ends and tightly support together can, so in this embodiment, be provided with two strong points on the bottom plate 1, can be with the tail end jack-up of first blade 2 to reduce the area that touches between first blade 2 and the second blade 3, make the friction when first blade 2 and second blade 3 carry out relative angular motion reduce greatly, solved above-mentioned problem well. And, more excellent effect is obtained, since the middle end of the first blade 2 is fixed on the bottom plate 1 by the fixing component 5, and the tail end is jacked up by the supporting point, the top end has the movement tendency of pressing down, so that the tight abutting effect between the blade parts of the top ends of the first blade 2 and the second blade 3 is better, and the fixing component 5 does not need to be screwed particularly tightly.

It is worth mentioning that the width direction of the first blade 2 can be understood in the transverse direction as shown in fig. 3, and the two supporting points are horizontally and symmetrically arranged at two sides of the first blade, i.e. arranged in the same row and left and right. Also, in the present embodiment, the number of the supporting points is two, but in other embodiments, the number of the supporting points may be more.

In addition, in order to realize that the left supporting point and the right supporting point can be contacted with the first blade 2 and have the supporting effect, the longitudinal heights of the two supporting points are equal.

The structure reliably ensures that the two supporting points can provide two left and right supports for the tail end of the first blade 2 along the width direction of the first blade 2, and compared with the structure that one supporting point is arranged at the center of the first blade 2, the left and right sides of the first blade 2 can be supported, so that the structure is more balanced and stable, and the lateral deviation can be effectively avoided.

Further, in order to find a preferable range of the first blade 2 for the convenience of experiment, as shown in fig. 4 and 5, in the present embodiment, an angle is provided between the second blade 2 and the third blade 3, and the angle is set to α °.

The inventor of the present application finds that the larger the value of α, i.e., the larger the lift amount of the tail end of the first blade 2, the stronger the abutting effect between the first blade 2 and the second blade 3, the stronger the friction force between the two, the larger the deformation amount of the first blade 2 itself, and the higher the possibility of occurrence of chipping. Therefore, the value of α cannot be increased at once, and an excessive value would result in excessive power for driving the two blades, reduced endurance, and an excessive probability of damage to the first blade 2 itself. The inventors of the present application thus preferably determined the range of 0 ° < α ≦ 10 °, in which the first blade 2 and the second blade 3 have the function of automatic grinding, and the power consumption is in a more reasonable interval, and the strength of the blades themselves is sufficient.

Further through a plurality of experiments, the inventor of the application obtains the optimal range of the value of alpha, the alpha is more than or equal to 1 degree and less than or equal to 5 degrees, in the range, the first blade 2 and the second blade 3 can be well and automatically ground, and the power for driving the first blade and the second blade to realize reciprocating angular motion is more reasonable, so that the better endurance time can be ensured, and the service life of the blades can be greatly prolonged.

Further, in this embodiment, the inventor of the present application selects the most preferable technical solution, that is, the included angle α =3 °. Since 3 is the most preferred solution that allows for both auto-grinding and endurance time.

As shown in fig. 1, 4 and 6, in the present embodiment, the guide sleeve 4 is provided on the rear end of the base plate, the first supporting block 41 and the second supporting block 42 are respectively provided on both ends of the guide sleeve 4 in the width direction of the first blade 2, and both the first supporting block 41 and the second supporting block 42 are provided between the first blade 2 and the second blade 3, and there is a supporting point at the top end of each of the first supporting block 41 and the second supporting block 42.

The above structure is to facilitate manufacturing and installation, and two supporting points are disposed at the top ends of the first supporting block 41 and the second supporting block 42 in the guiding sleeve 4, and it should be mentioned that the structure of the supporting points is not limited in this embodiment, that is, the two supporting points may be an integral structure or a split structure, and only two supporting effects along the width of the first blade 2 need to be provided.

Furthermore, in the above structure, the guide sleeve 4 is disposed above the second blade 3, and both support blocks on the guide sleeve 4 are disposed below the first blade 2, so that the first blade 2 can press the guide sleeve 4 against the second blade 3.

In the present embodiment, in the lateral direction as shown in fig. 3, two support points are disposed one on the left and one on the right, and the fixing member 5 is disposed on the center line of the line connecting the two support points, and the fixing member 5 is disposed above the support points.

In addition, as shown in fig. 2 and fig. 5, in the present embodiment, the fixing component 5 includes a fixing ring 51, the top end of the fixing ring 51 has a limiting portion 511 protruding outwards, the bottom end of the limiting portion 511 abuts against the top end of the second blade 3, and the first blade 2 is sleeved outside the limiting portion 511, which, on one hand, limits the movement of the second blade 3, and on the other hand, through the sleeved arrangement of the first blade 2, enables the first blade 2 to rotate around the fixing ring 51.

Further, the fixing assembly 5 further comprises a locking screw 52, a limit nut 53 and a pressing plate 54, the pressing plate 54 is arranged at the top end of the positioning ring 51, the locking screw 52 is suitable for penetrating through the pressing plate 54 and the positioning ring 51, then penetrating through the bottom plate 1 to be connected with the limit nut 53, and is suitable for limiting the movement of the positioning ring 51 through pressing the pressing plate 54; and the pressing plate 54 is adapted to extend outwardly of the stopper portion 511 and to restrict the longitudinal movement of the first blade 2 out of the lock ring 51. The above structure is simple, installation is simple, and the fixing arrangement of the position ring 51 and the pressure plate 54 is reliably realized, so that the limitation on the movement of the second blade 3 and the limitation on the longitudinal movement of the first blade 2 out of the position ring 51 are realized.

Also, in the present embodiment, the grass cutting blade is of a single-acting type, the first blade 2 is adapted to be connected to and swing under the driving of an external driving device, the second blade 3 is adapted to be fixedly disposed on the base plate, and the first blade 2 is adapted to repeatedly approach and depart from the second blade 3, so that the first blade portion 21 and the second blade portion 31 are adapted to repeatedly intersect and depart from each other, thereby achieving grass cutting.

And since the second blade 3 in the single-acting structure does not need to swing, in this embodiment, the tail end of the second blade 3 is provided with an outwardly protruding mounting portion 32, and the mounting portion 32 is adapted to be inserted into the base plate 1, thereby realizing the restriction of the rotation of the second blade 3.

Further, as shown in fig. 6 and 7, in the present embodiment, in order to prevent the blade from rotating 360 ° around the locking screw 52 during installation and to increase the restriction of the blade swinging during operation, a limit structure is provided in the lawnmower.

The specific structure of the limiting structure is as follows: sleeving the first blade 2 on the guide sleeve 4 so that the guide sleeve 4 is suitable for swinging together with the first blade 2; at least one of the first support block 41 and the second support block 42 is selected, a limit protrusion 43 is arranged at the bottom end of the support block, a guide groove 33 with an arc structure is arranged at the corresponding position of the second blade 3, and the limit protrusion 43 is suitable for being inserted into the guide groove 33, so that the relative rotation range of the first blade 2 and the second blade 3 is limited.

Of course, the limiting structure may also adopt other modes, such as a mode of arranging a limiting column on the second blade 3, a mode of arranging a waist-shaped hole on the first blade 2, and the like.

It is worth mentioning that in some variant embodiments, the grass cutting blade may also be of a double-acting type, i.e. the first blade 2 and the second blade 3 are both adapted to be connected to an external driving device and to swing under the driving of the external driving device, and the first blade portion 21 and the second blade portion 31 of the first blade 2 and the second blade 3 are adapted to repeatedly intersect and move away, thereby achieving grass cutting.

Single-acting type grass cutter compares in double acting type grass cutter, though its grass cutting efficiency has the decline of certain degree, but its power consumption of during operation is little, and operating current is little, and power consumption is low, thereby can make grass cutter obtain a comparatively lasting time of endurance, make operating personnel need not to charge regularly, and it is more convenient to use, and use cost is lower, and because set up the reason of strong point in this application, first sword cutting part 21 and second sword cutting part 31 are tight to be in the same place, consequently improve grass cutting efficiency to a certain extent, thereby make the single-acting type grass cutter of this application also have a comparatively good grass cutting function. Of course, the grass-cutting blade may also be of a double-acting type in order to achieve a more excellent grass-cutting efficiency.

And, the grass-cutting sword of this application can be divided into the grass-cutting sword of two kinds of 120mm and 160mm according to its effective grass-cutting length, and the grass-cutting sword of 120mm type because its area of contact with the grass is little, and the load is not big, and too big blade thickness is reasonable inadequately, can produce the waste, consequently the grass-cutting sword of 120mm type, its first blade 2 and second blade 3 all adopt 1.2mm thickness. The 160mm type grass cutting knife has the advantages that the load is increased, the thickness is insufficient, the blade edges on two sides of the 160mm type grass cutting knife are too soft, the grass cutting efficiency is affected, and therefore the thickness of the first blade 2 and the second blade 3 is 1.6 mm. It is worth mentioning that the two types mentioned above are provided for high practicality, and are not limited to the specific embodiment of the present application, and blades of other lengths and thicknesses may be used.

In addition, in this embodiment, the retainer ring 51 and the guide sleeve 4 are both made of powder metallurgy, because in actual use, due to the rotation of the blade, the two are in direct contact with the blade, and therefore are easily worn, and the powder metallurgy has good wear resistance, which can effectively solve the above problems

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (12)

1. The utility model provides a grass cutter, includes bottom plate, first blade and second blade, its characterized in that: the first blade and the second blade are suitable for relative movement, a fixing assembly is arranged on the bottom plate and is suitable for limiting the movement of the first blade and the second blade; at least two supporting points arranged along the width direction of the first blade are arranged between the first blade and the second blade on the bottom plate, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly abutted; and an included angle alpha is formed between the tail end of the first blade and the second blade after the tail end of the first blade is lifted, wherein alpha is larger than 0 degree and is less than or equal to 10 degrees.

2. A lawnmower blade according to claim 1, wherein: alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

3. A lawnmower blade according to claim 2, wherein: α =3 °.

4. A lawnmower blade according to claim 1, wherein: the first blade is suitable for connecting an external driving device and swings under the driving of the external driving device, the second blade is suitable for being fixedly arranged on the bottom plate, and the blade parts of the first blade and the second blade are suitable for being repeatedly crossed and far away.

5. A lawnmower blade according to claim 4, wherein: the tail end of the second blade is provided with an installation part protruding outwards, and the installation part is suitable for being inserted into the bottom plate.

6. A lawnmower blade according to claim 1, wherein: the number of the supporting points is two, and the two supporting points are horizontally and symmetrically arranged on two sides of the first blade.

7. A lawnmower blade according to claim 6, wherein: the supporting device comprises a base plate and is characterized in that a first supporting block and a second supporting block are respectively arranged on two sides of the tail end of the base plate in the width direction of the first blade, the first supporting block and the second supporting block are respectively arranged between the first blade and the second blade, and the top ends of the first supporting block and the second supporting block are respectively provided with one supporting point.

8. A lawnmower blade according to claim 7, wherein: the guide sleeve is arranged on the tail end of the base plate, the first supporting block and the second supporting block are respectively arranged at two ends of the guide sleeve in the width direction of the first blade, and the first supporting block and the second supporting block are suitable for pressing down the second blade.

9. A lawnmower blade according to claim 1, wherein: the tail end of the bottom plate is provided with a guide sleeve, and the first blade is sleeved on the guide sleeve, so that the guide sleeve is suitable for swinging together with the first blade; the guide sleeve is provided with a first support block and a second support block, at least one of the first support block and the second support block is provided with a limiting protrusion at the bottom end, the second blade is provided with a guide groove with an arc structure, the limiting protrusion is suitable for being inserted into the guide groove, and the limiting protrusion and the guide groove are matched to limit the relative rotation range of the first blade and the second blade.

10. A lawnmower blade according to claim 1, wherein: the fixed component comprises a fixed locating ring, the top end of the locating ring is provided with a limiting portion protruding outwards, the bottom end of the limiting portion abuts against the top end of the second blade, and the first blade is sleeved on the outer side of the limiting portion.

11. A lawnmower blade according to claim 10, wherein: the fixing assembly further comprises a locking screw, a limiting nut and a pressing plate, the pressing plate is arranged at the top end of the positioning ring, and the locking screw is suitable for penetrating through the pressing plate and the positioning ring, then penetrating through the bottom plate to be connected with the limiting nut, and is suitable for limiting the movement of the positioning ring by pressing the pressing plate; and the pressure plate is suitable for extending out of the limiting part and limiting the first blade to longitudinally move to be separated from the positioning ring.

12. A lawnmower blade according to claim 1, wherein: the first blade and the second blade are both suitable for being connected with an external driving device and swing under the driving of the external driving device, and the blade parts of the first blade and the second blade are suitable for being crossed and far away repeatedly.

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