Grass trimming head and grass trimmer

Abstract

According to the technical scheme, the grass trimming head comprises a shell, the shell at least comprises an upper shell and a lower shell, and a penetrating hole is formed in the center of the lower shell; the bobbin is accommodated in the shell and is provided with an inner threading hole and two winding parts; the bias part has a trend of biasing the bobbin along the axial direction of the shell; the positioning frame is connected to the bobbin and is linked with the bobbin; the ratchet is arranged in the shell and moves along with a bobbin; the guide teeth are arranged on the inner wall of the shell and matched with the ratchets; the triggering end penetrates out of the penetrating-out hole and is connected to the positioning frame, and the triggering end is in linkage with the bobbin; the inclination angle of at least one of the ratchets or the guide teeth is smaller than or equal to 20 degrees, and therefore miniaturization of the grass trimming head is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of garden tools, in particular to a grass cutting head and a grass cutting machine. BACKGROUND

[0002] The grass cutting machine is a handheld tool for cutting weeds in lawns, gardens, pastures and the like. According to the power source, it can be divided into oil-driven and electric-driven; according to the structure of the power head, it can be divided into front-mounted power type and rear-mounted power type.

[0003] In the related art, a storage rope type handheld electric grass cutting machine is disclosed in Chinese Patent No. CN2504889Y, which includes a grass cutting machine handle, a double safety switch and a charging socket on the handle, a battery box connected with the switch box, a lifting handle cooperating with the operation handle, and a grass cutting device connected with the main handle of the grass cutting machine. The grass cutting device of the grass cutting machine is composed of a motor in the grass cutting head shell, a nylon rope reel, an edge trimming wheel disc below the shell, and a protective cover positioned on the shell.

[0004] However, the current grass cutting head needs to be knocked to release the line during the grass cutting process, thus limiting the miniaturization of the grass cutting head. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a grass cutting head and a grass cutting machine to solve the problem of limited miniaturization of the grass cutting head.

[0006] To solve the above technical problems, the present application is implemented as follows:

[0007] In one embodiment, a grass cutting head is provided, comprising:

[0008] A shell comprising at least an upper shell and a lower shell, wherein a through hole is formed in the center of the lower shell;

[0009] A reel accommodated in the shell and having an inner threading hole and two winding parts;

[0010] A biasing member having a tendency to axially bias the reel along the shell;

[0011] A positioning frame connected to the reel and linked with the reel;

[0012] A ratchet tooth arranged in the shell and moving with the reel;

[0013] A guide tooth arranged on the inner wall of the shell and matched with the ratchet tooth;

[0014] A trigger end protruding from the through hole and connected to the positioning frame, the trigger end being linked with the reel;

[0015] The inclination angle of at least one of the ratchet teeth or the guide teeth is less than or equal to 20°.

[0016] In other optional embodiments, the inclination angle of at least one of the ratchet teeth or the guide teeth is less than or equal to 8°, the inclination angle of at least one of the ratchet teeth or the guide teeth is greater than or equal to 5°; the guide teeth are located on the bottom wall of the lower shell and around the through hole.

[0017] In other optional embodiments, the biasing member is a resilient member, the stiffness coefficient of the biasing member is at least 40 N / m; further comprising a stop member, the shell is provided with a blocking member matched with the stop member, the blocking member corresponds to the ratchet teeth and the blocking member and the ratchet teeth are staggered.

[0018] In other optional embodiments, at least one of the stop member or the blocking member is provided with a guide portion against the rotation direction of the shell when mowing, the guide portion has an increasing height against the rotation direction of the shell when mowing.

[0019] In other optional embodiments, the movement distance of the trigger end is at most 7 mm; the upper shell and the lower shell are connected by snap connection.

[0020] In other optional embodiments, the trigger end is provided with a holding portion, the holding portion is located outside the shell.

[0021] In other optional embodiments, the bottom of the holding portion is provided with a pad member; a bearing is arranged between the pad member and the holding portion; the pad member is provided with a weight-reducing groove.

[0022] In other optional embodiments, the holding portion is provided with an opening, the lower shell bottom end is inserted in the opening, the stop member is located between the trigger end and the holding portion, and the blocking member is located on the bottom wall of the lower shell and corresponds to the position of the stop member.

[0023] In other optional embodiments, one side of the positioning frame is connected to the spool by a fastener, and the other side is connected to the trigger end by a fastener; the top of the spool is provided with a receiving groove, and the biasing member is located in the receiving groove and abuts against the upper shell.

[0024] Based on the same inventive concept, the application also discloses a grass mowing machine, comprising:

[0025] a shell;

[0026] a grass mowing head as described in one of the above embodiments;

[0027] a motor providing power required for driving the grass mowing head to rotate;

[0028] a battery pack providing energy to the motor;

[0029] a connecting piece for transmitting energy to the motor or transmitting power to the grass head.

[0030] In the embodiment of the present application, the inclination angle of the ratchet is reduced to below 20 degrees, thereby effectively shortening the distance of the positioning frame moving up and down, and thus enabling the miniaturization of the grass head. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the grass head in an embodiment of the present application;

[0032] Figure 2 Fig. 2 is a schematic diagram of the exploded structure of the grass head in an embodiment of the present application;

[0033] Figure 3 Fig. 3 is a schematic diagram of the two states of the structure at the ratchet in an embodiment of the present application;

[0034] Figure 4 Fig. 4 is a schematic diagram of the exploded structure of the grass head from another perspective in an embodiment of the present application;

[0035] Figure 5 Fig. 5 is a schematic diagram of the exploded structure of the surrounding structure of the lower shell in an embodiment of the present application;

[0036] Figure 6 Fig. 6 is a schematic diagram of the overall structure of the grass trimmer in an embodiment of the present application.

[0037] BRIEF DESCRIPTION OF DRAWINGS: 1, housing; 11, upper shell; 12, lower shell; 120, outer threading hole; 121, threading hole; 13, blocking piece; 2, spool; 20, inner threading hole; 21, flange; 211, winding part; 22, accommodating groove; 3, biasing piece; 4, positioning frame; 40, fastening piece; 41, ratchet; 411, first guide surface; 412, first blocking surface; 5, guide tooth; 51, second guide surface; 52, second blocking surface; 6, trigger end; 61, gripping part; 610, extension part; 611, pad piece; 6111, weight-reducing groove; 612, bearing; 613, opening; 7, stop piece; 71, guide part; 8, outer shell; 80, fitting part; 81, battery pack; 82, connecting piece. DETAILED DESCRIPTION

[0038] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements can be present. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] Referring to Figure 1 and Figure 2 Fig. 1 shows the overall structure of the lawn cutting head according to an embodiment of the present application, and Fig. 2 shows the exploded structure of the lawn cutting head according to an embodiment of the present application. The lawn cutting head according to an embodiment of the present application can be assembled and driven to rotate to cut grass. The lawn cutting head comprises a housing 1, a spool 2, a biasing member 3, a positioning frame 4, a ratchet 41, a guide tooth 5 and a trigger end 6. The housing 1 comprises an upper housing 11 and a lower housing 12. The upper housing 11 and the lower housing 12 can be connected by a snap connection or a screw connection, as long as the upper housing 11 and the lower housing 12 can be easily disassembled.

[0045] The spool 2 is accommodated in the housing 1. The spool 2 can have an inner threading hole 20 passing through the center thereof and two winding portions 211. The outer side wall of the spool 2 can be formed with three layers of flanges 21. One winding portion 211 can be formed between any two adjacent layers of flanges 21. The two winding portions 211 can be symmetrically arranged relative to the inner threading hole 20. One end of the inner threading hole 20 is only in communication with one of the winding portions 211, and the other end is in communication with the other winding portion 211, so as to reduce the probability of the wire being wound together. The lower housing 12 can be provided with an outer threading hole 120. When the inner threading hole 20 is aligned with the outer threading hole 120, the grass cutting string can be threaded into the spool 2. At this time, if the spool 2 and the housing 1 are relatively rotated, the grass cutting string is wound on the winding portion 211.

[0046] Referring to Figure 2 and Figure 33 shows a schematic diagram of the ratchet structure in an embodiment of the present application. The biasing member 3 can be accommodated in the housing 1 and has a tendency to bias the spool 2 axially along the housing 1, so that the spool 2 can move axially along the housing 1 under the bias of the biasing member 3. The positioning frame 4 can be connected to the spool 2 and move together with the spool 2. The ratchet 41 can be formed in the housing 1 and move with the spool 2. In particular, the ratchet 41 can be integrally formed with the positioning frame 4. The guide tooth 5 can be provided on the inner wall of the housing 1 and cooperate with the ratchet 41, wherein the guide tooth 5 can be located on the inner wall of the upper shell 11 or on the inner wall of the lower shell 12. Preferably, the ratchet 41 has a first guide surface 411 and a first blocking surface 412, and the guide tooth 5 has a second guide surface 51 and a second blocking surface 52. When the mowing head is driven to rotate for mowing, the first blocking surface 412 and the second blocking surface 52 cooperate with each other to prevent the spool 2 and the shell 1 from rotating relative to each other. When the mowing rope needs to be wound around the spool 2, the first guide surface 411 and the second guide surface 51 cooperate to achieve relative rotation of the spool 2 and the shell 1.

[0047] A through hole 121 is provided in the center of the lower shell 12. One end of the trigger end 6 can be connected to the positioning frame 4 and linked with the positioning frame 4, and the other end can pass through the through hole 121 and protrude from the surface of the lower shell 12. When the trigger end 6 is triggered, the positioning frame 4 and the spool 2 move axially along the shell 1 at the same time. At this time, the first blocking surface 412 and the second blocking surface 52 are disengaged, thereby enabling the grass trimmer head to release the line.

[0048] The inclination angle of at least one of the ratchet tooth 41 or the guide tooth 5 is less than or equal to 20°, where the inclination angle refers to the inclination angle of the first guide surface 411 or the second guide surface 51 relative to a plane perpendicular to the axis of the housing 1, i.e., angle A in the figure. In particular, in the embodiment of the present application, the inclination angles of the ratchet tooth 41 and the guide tooth 5 are consistent, that is, the ratchet tooth 41 or the guide tooth 5 are both less than or equal to 20°. When the inclination angle decreases, the travel distance of the trigger end 6 during the line-winding process decreases, and the travel distance of the trigger end 6 during the line-paying process also decreases. This reduces the size of the trimmer head, thereby facilitating miniaturization of the trimmer head.

[0049] In one or other preferred embodiments, the inclination angle of at least one of the ratchet tooth 41 or the guide tooth 5 is less than or equal to 8° and greater than or equal to 5°. When the inclination angle is further reduced, the size of the mower head can be further reduced. However, the inclination angle cannot be reduced blindly, so it is better when the inclination angle is greater than or equal to 5° and less than or equal to 8°.

[0050] In one or other preferred embodiments, when the inclination angle is reduced, although the size of the grass trimming head can be further reduced, the positioning frame 4 and the shell 1 are more likely to be decoupled, therefore, the biasing member 3 can be a resilient member, preferably, the biasing member 3 is a spring, in particular, the stiffness coefficient of the biasing member 3 is at least 40 N / m, thereby reducing the probability of misoperation of the trigger end 6. Preferably, in the embodiments of the present application, the stiffness coefficient of the biasing member 3 is 40 N / m, 42 N / m, 43 N / m, 44 N / m, 45 N / m, 46 N / m, 47 N / m, 48 N / m, 49 N / m or 50 N / m.

[0051] In one or other preferred embodiments, the top of the spool 2 can be provided with a receiving groove 22, and the biasing member 3 can be located in the receiving groove 22, one end of which can abut against the spool 2, and the other end of which can abut against the inner wall of the upper shell 11, thereby exerting a continuous biasing force on the spool 2.

[0052] In one or other preferred embodiments, one side of the positioning frame 4 can be connected to the spool 2 by a fastener 40, and the other side of the positioning frame 4 can be connected to the trigger end 6 by a fastener 40, and the fastener 40 can be a screw, a bolt or other member, thereby connecting the spool 2, the intermediate member and the trigger end 6 together in linkage and facilitating the disassembly and assembly of the three members.

[0053] In one or other preferred embodiments, the movement distance of the trigger end 6 is at most 7 mm, and in the embodiments of the present application, the maximum movement distance of the trigger end 6 is preferably 6.5 mm, thereby further reducing the size of the grass trimming head.

[0054] In one or other preferred embodiments, the trigger end 6 is further provided with a gripping portion 61, the diameter of the gripping portion 61 is greater than the diameter of the trigger end 6, the trigger end 6 can be integrally formed with the gripping portion 61, the gripping portion 61 can be a cylindrical member concentrically arranged with the trigger end 6, and the bottom wall of the gripping portion 61 extends to form an extension 610 towards the trigger end 6, thereby connecting the trigger end 6 together. Since one end of the trigger end 6 extends out of the hole 121 of the lower shell 12, the gripping portion 61 is located at the bottom of the lower shell 12 and externally, thereby increasing the area of the trigger end 6 in contact with the ground and facilitating the process of striking the ground to pay out the line during the operation of the grass trimming head.

[0055] In one or other preferred embodiments, the bottom of the gripping portion 61 can be provided with a pad 611, and the pad 611 can be made of a material with higher wear resistance than the gripping portion 61, for example, metal, thereby improving the service life of the pad 611.

[0056] Preferably, the cushion 611 and the holding part 61 can be connected through a bearing 612, that is, the outer ring of the bearing 612 can be connected with the holding part 61, and the inner ring can be connected with the cushion 611, so that the cushion 611 can rotate relative to the holding part 61 when the cushion 611 contacts the ground, thereby reducing the wear of the cushion 611.

[0057] In one or other preferable embodiments, the cushion 611 can be provided with a weight-reducing groove 6111, which can be through the thickness of the cushion 611, or can be a sunken groove, as long as it can reduce the weight of the cushion 611 and reduce the impact force when the grass head falls.

[0058] In one or other preferable embodiments, the holding part 61 is provided with an opening 613, and the holding part 61 is configured as a cylinder with both ends open. One end of the holding part 61 is used to receive the bottom end of the lower shell 12, that is, the bottom end of the lower shell 12 is inserted into the opening 613 of the holding part 61; the other end is formed with an extension 610 connected with the trigger end 6.

[0059] Referring to Figure 4 and Figure 5 , FIG. 4 shows an exploded structural schematic view of another view of the grass head in an embodiment of the present application, and FIG. 5 shows an exploded schematic view of the structure around the lower shell in an embodiment of the present application. In one or other preferable embodiments, the above-mentioned grass head further comprises a stop piece 7, and the shell 1 is further provided with a blocking piece 13 cooperating with the stop piece 7. The stop piece 7 can be provided on the top wall of the upper shell 11, and at this time, the blocking piece 13 can be provided on the spool 2. Of course, the stop piece 7 can also be connected to the positioning frame 4, and at this time, the blocking piece 13 can be provided inside the shell 1. In the embodiment of the present application, the stop piece 7 is provided on the trigger end 6, specifically, the stop piece 7 is located between the trigger end 6 and the holding part 61, that is, the stop piece 7 is located on the extension 610 of the holding part 61 connecting with the trigger end 6 and faces the lower shell 12. At this time, the blocking piece 13 can be provided on the surface of the lower shell 12 facing the extension 610. Specifically, the stop piece 7 is integrally formed with the extension 610, and the blocking piece 13 is integrally formed with the lower shell 12. In particular, the blocking piece 13 corresponds to and is staggered with the ratchet teeth 41, that is, when the ratchet teeth 41 are disengaged from the guide teeth 5, the stop piece 7 can just contact the blocking piece 13, thereby limiting the rotation angle of the spool 2 and further limiting the wire releasing size.

[0060] In one or other preferred embodiments, the stopper 7 or the blocking piece 13 is provided with a guide portion 71 in the direction opposite to the rotation direction of the housing 1 when the grass trimmer is used, which can be an arc surface, an inclined surface, or a combination of the inclined surface and the arc surface. The height of the guide portion 71 gradually increases in the selected direction opposite to the rotation direction of the housing 1 when the grass trimmer is used. When the grass trimmer head rotates in the forward direction, the stopper 7 and the blocking piece 13 can be locked with each other even after the ratchet teeth 41 and the guide teeth 5 are disengaged, and when the grass trimmer head enters the winding mode, the guide portion 71 can guide the blocking piece 13 to pass the stopper 7 to complete the rotation when the holding portion 62 rotates relative to the housing 1 in the direction opposite to the grass trimming direction.

[0061] In combination Figure 6 As shown in FIG. 6, which shows the overall structure of the grass trimmer in an embodiment of the present application, in some embodiments, the grass trimmer comprises a housing 8, a grass trimmer head as disclosed in any of the above embodiments, a motor, a battery pack 81, and a connecting piece 82. The housing 8 is provided with an adapter 80 for connecting the battery pack 81. The motor can be connected to the grass trimmer head or arranged in the housing 8, as long as it can provide power to the grass trimmer head and drive the grass trimmer head to rotate. The battery pack 81 provides power to the motor for rotation. The connecting piece 82 can be a hollow pipe, one end of which is connected to the grass trimmer head and the other end of which is connected to the housing 8. When the motor is arranged in the housing 8, the connecting piece 82 transmits power to the grass trimmer head; when the motor is arranged in the grass trimmer head, the connecting piece 82 transmits power to the motor.

[0062] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present application.

[0063] The above embodiments only express several embodiments of the present application, which are described in detail, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent application should be subject to the appended claims.

Claims

1. A grass trimmer head, characterized in that: include: The housing comprises at least an upper shell and a lower shell, wherein a through hole is formed in the center of the lower shell; a bobbin housed in the housing and having an inner threading hole and two winding portions; a biasing member having a tendency to bias the spool axially along the housing; a positioning frame connected to the spool and linked to the spool; a ratchet disposed in the housing and moving with the spool; A guide tooth, provided on the inner wall of the housing and cooperating with the ratchet tooth; a trigger end, passing through the through hole and connected to the positioning frame, the trigger end being linked to the spool; The inclination angle of at least one of the ratchet teeth or the guide teeth is less than or equal to 20°.

2. The grass trimmer head according to claim 1, characterized in that: The inclination angle of at least one of the ratchet teeth or the guide teeth is less than or equal to 8°, and the inclination angle of at least one of the ratchet teeth or the guide teeth is greater than or equal to 5°; the guide teeth are located on the bottom wall of the lower shell and around the outlet hole.

3. The grass trimmer head according to claim 1, characterized in that: The biasing member is an elastic member, and the stiffness coefficient of the biasing member is at least 40N / m; it also includes a stopper, and a stopper cooperating with the stopper is provided on the shell, and the stopper corresponds to the ratchet and the stopper and the ratchet are staggered.

4. The grass trimmer head according to claim 3, characterized in that: At least one of the stopper or the blocking member is provided with a guide portion in a direction opposite to the rotation direction of the housing when mowing grass, and the guide portion increases in height in a direction opposite to the rotation direction of the housing when mowing grass.

5. The mowing head according to claim 1, characterized in that: The maximum movement distance of the trigger end is 7 mm; the upper shell and the lower shell are connected by a buckle.

6. The grass trimmer head according to claim 3, characterized in that: The trigger end is provided with a gripping portion, and the gripping portion is located outside the shell.

7. The mowing head according to claim 6, characterized in that: A cushion is provided at the bottom of the gripping portion; a bearing is provided between the cushion and the gripping portion; and a weight-reducing groove is provided on the cushion.

8. The mowing head according to claim 6, characterized in that: The grip portion is provided with an opening, the bottom end of the lower shell is inserted into the opening, the stopper is located between the trigger end and the grip portion, and the blocking member is located on the bottom wall of the lower shell and at a position corresponding to the stopper.

9. The mowing head according to claim 1, characterized in that: One side of the positioning frame is connected to the spool via a fastener, and the other side is connected to the trigger end via a fastener; a receiving groove is provided on the top of the spool, and the biasing member is located in the receiving groove and abuts against the upper shell.

10. A grass trimmer, characterized in that: include: shell; The mowing head according to any one of claims 1 to 9; A motor, providing the power required to drive the mowing head to rotate; a battery pack, providing energy to the motor; The connecting piece transmits energy to the motor or transmits power to the mowing head.

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