Grass trimming head and mower

Abstract

The utility model discloses a grass trimming head and a mower, the grass trimming head comprises a shell, the annular side wall of the shell is provided with a line outlet hole for a grass trimming rope to extend out, and the inner side surface of the annular side wall is provided with a plurality of bolt seats for accommodating counterweight pins along the circumferential direction; the plurality of bolt seats are symmetrically arranged with the longitudinal section where the central axis of the wire outlet hole is located as the symmetric reference, and a counterweight area formed by the plurality of bolt seats and the wire outlet hole are located on the two sides of the central positioning shaft of the shell respectively. When the dynamic balance of the grass mowing head needs to be adjusted, the balance weight pin with the proper weight is installed in the plug pin seat, the original length of the grass mowing rope and the injection molding quality of the shell are not affected, and the dynamic balance value of the grass mowing head is easy to estimate.

Description

Technical Field

[0001] The utility model relates to the technical field of design and manufacturing of garden tools, in particular to a grass trimmer head and a lawn mower provided with the grass trimmer head. Background Art

[0002] A lawn mower, also known as a weed cutter, lawn mower, lawn trimmer, etc., is a mechanical tool used to trim lawns, vegetation, etc. The mowing head is the rotating mechanism of the mower, generally including a housing and a mowing rope extending from a wire outlet hole on the side of the housing. When the mowing rope rotates with the housing, the mowing function can be achieved.

[0003] A single-line mowing head refers to a mowing head with a wire outlet hole on the side of the housing, that is, only one mowing rope extends from the side of the housing. For a single-line mowing head, in order to adjust the dynamic balance and reduce vibration, a counterweight needs to be added to the mowing head housing. For example, a plastic block or a metal sheet is added to the mowing head housing on the side opposite to the wire outlet hole as a counterweight to adjust the dynamic balance.

[0004] However, the mower head shell is a plastic part. If the dynamic balance is adjusted by changing the internal structure, it needs to be completed by changing the mold, and it is difficult to ensure that the length of the mower rope does not change too much after the adjustment. In addition, the addition of a plastic structure to the mower head results in a thicker wall thickness, which is prone to deformation and shrinkage during injection molding. The metal sheet punching accuracy is poor, and it is difficult to estimate the weight of a single piece and the combined weight, which makes it difficult to estimate the dynamic balance value.

[0005] Therefore, how to provide a dynamic balance adjustment method that does not affect the original length of the mowing rope and the injection molding quality of the shell, and easily estimates the dynamic balance value of the mowing head, is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a mower head and a lawn mower, which can maintain the original length of the mower rope and the injection molding quality of the shell during the adjustment of the dynamic balance of the mower head, and can easily estimate the dynamic balance value of the mower head.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A grass trimmer head comprises a shell, the annular side wall of the shell is provided with a wire outlet hole for extending a grass trimmer rope, and the inner side surface of the annular side wall is provided with a plurality of pin seats for accommodating a counterweight pin arranged in a circumferential direction;

[0009] The plurality of latch seats are symmetrically arranged with the longitudinal section where the central axis of the outlet hole is located as a symmetry reference, and the counterweight area formed by the plurality of latch seats and the outlet hole are respectively located on both sides of the central positioning axis of the shell.

[0010] Optionally, in the above-mentioned grass trimmer head, the pin seat is a strip-shaped protrusion protruding from the inner side surface of the annular side wall, and the axial direction of the insertion hole of the pin seat is parallel to the axial direction of the central positioning axis.

[0011] Optionally, in the above-mentioned grass trimmer head, two latch seats are provided on the inner side surface of the annular side wall, namely a first latch seat and a second latch seat;

[0012] On a horizontal projection plane, a line connecting the center of the first plug seat and the center of the central positioning axis is recorded as a first line, and a line connecting the center of the second plug seat and the center of the central positioning axis is recorded as a second line, and an angle between the first line and the second line is any value within a range of 10° to 30°. For example, the angle is 21°.

[0013] Optionally, among the multiple pin seats of the above-mentioned grass trimmer head, the insertion hole of any one of the pin seats has the same hole diameter and the same hole depth as the insertion hole of another pin seat symmetrically arranged therewith.

[0014] Optionally, in the above-mentioned grass trimmer head, the inner side surface of the annular side wall is also protrudingly provided with reinforcing ribs; and the reinforcing ribs are respectively provided on both sides of each of the pin seats and connected thereto.

[0015] Optionally, in the above-mentioned grass trimmer head, the annular side wall, the pin seat and the reinforcing ribs are an integrated injection molding structure.

[0016] Optionally, in the above-mentioned grass trimmer head, at least a partial area of ​​the counterweight pin is made of metal material.

[0017] Optionally, in the above-mentioned grass trimmer head, the counterweight pin is a pin with a standard size, and the socket of the pin seat can be adapted to pins of various different specifications.

[0018] A lawn mower is provided with the above-mentioned mowing head.

[0019] It can be seen from the above technical solutions that the mowing head and the lawn mower provided by the utility model can adopt a new dynamic balance adjustment method to achieve the dynamic balance of the mowing head, which has at least the following advantages:

[0020] a) The counterweight pin can be a standard part purchased directly, which is generally made of metal. Its size and weight are more precise than those of metal sheets. The error is very small when calculating the dynamic balance, and it is easy to estimate the dynamic balance value of the mower head.

[0021] b) The dynamic balance adjustment of the mowing head can be completed by adjusting the number of counterweight pins and selecting counterweight pins of different lengths. During the process, the length of the mowing rope does not need to be adjusted, so it can be ensured that the length of the mowing rope does not change much after the adjustment is completed.

[0022] c) Since the dynamic balance of the mower head is achieved by a counterweight pin, when a latch seat is added to the shell, whether the latch seat is installed in the shell by a combined installation method or formed in the shell by one-piece injection molding or machining, the size, volume and weight requirements of the latch seat are relatively small during the manufacturing process, so it has little effect on the shell wall thickness and its injection molding process, which is beneficial to avoid deformation, shrinkage and other problems when the shell is injected.

[0023] d) The internal space of the mowing head housing can be fully utilized without affecting the original design of the mowing rope and other supporting parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is an axonometric view of the grass trimmer head housing provided in an embodiment of the utility model.

[0026] Figure 2 A top view of the grass trimmer head shell provided in an embodiment of the utility model.

[0027] Figure 3 A top view of the internal structure of a grass trimmer head provided in an embodiment of the utility model.

[0028] Figure 4 An exploded view of the parts of a grass trimmer head provided in an embodiment of the utility model.

[0029] in:

[0030] 1-annular side wall, 2-wire outlet hole, 3-weight pin, 4-pin seat, 5-reinforcement rib, 6-center positioning axis,

[0031] 7-grass rope, 8-winding wheel, 9-line release slider, 10-cover body, 11-line outlet block, 401-socket. DETAILED DESCRIPTION

[0032] The utility model discloses a grass trimmer head and a lawn mower. During the process of dynamic balance adjustment of the grass trimmer head, the original length of the grass trimmer rope and the injection molding quality of the shell body can be not affected, and the dynamic balance value of the grass trimmer head can be easily estimated.

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figures 1 to 4 The mowing head provided by the embodiment of the utility model comprises a shell, a cover 10, a mowing rope 7, a winding wheel 8, a line-release slider 9 and a line-out block 11. The annular side wall 1 of the shell is provided with a line-out hole 2 for extending the mowing rope 7, and the line-out block 11 is located in the line-out hole 2; moreover, the inner side surface of the annular side wall 1 is provided with a plurality of (i.e., at least two) latch seats 4 for accommodating a counterweight pin 3 arranged in a circumferential direction, and the plurality of latch seats 4 are symmetrically arranged with the longitudinal section where the central axis of the line-out hole 2 is located as a symmetry reference, and the plurality of latch seats 4 are concentratedly arranged on a side away from the line-out hole 2 to form a counterweight area, that is, the counterweight area formed by the plurality of latch seats 4 and the line-out hole 2 are respectively located on both sides of the central positioning axis 6 of the shell. The longitudinal section mentioned in this article refers to a plane jointly determined by the central axis of the line-out hole 2 and the central axis of the central positioning axis 6.

[0035] During the assembly of the grass trimmer head, the counterweight pin 3 can be installed through the latch seat 4, so that the counterweight pin 3 forms a balancing structure with the grass trimmer rope, thereby achieving the purpose of adjusting the overall dynamic balance of the grass trimmer head. During the process of adjusting the dynamic balance, only the number of counterweight pins 3 needs to be adjusted, or counterweight pins 3 of different lengths need to be selected, and the structure of the latch seat 4 itself does not need to be changed.

[0036] It can be seen that the grass trimmer head provided in the embodiment of the utility model can adopt a new dynamic balance adjustment method, so it has at least the following advantages:

[0037] a) The counterweight pin 3 can be a standard part purchased directly, which is generally made of metal material. Its size and weight are more precise than those of metal sheets, and the error is very small when calculating the dynamic balance, so it is easy to estimate the dynamic balance value of the mower head.

[0038] b) The dynamic balance adjustment of the mowing head can be completed by adjusting the number of counterweight pins 3 and selecting counterweight pins 3 of different lengths. During the process, the length of the mowing rope does not need to be adjusted, so it can be ensured that the length of the mowing rope does not change too much after the adjustment is completed.

[0039] c) Since the dynamic balance of the grass trimmer head is achieved by the counterweight pin 3, when the latch seat 4 is added in the shell, no matter the latch seat 4 is installed in the shell by combined installation or the latch seat 4 is formed in the shell by one-piece injection molding or machining, the size, volume and weight requirements of the latch seat 4 are relatively small during the manufacturing process, so it has little effect on the shell wall thickness and its injection molding process, which is beneficial to avoid deformation, shrinkage and other problems when the shell is injected.

[0040] d) The internal space of the mowing head housing can be fully utilized without affecting the original design of the mowing rope 7 and other supporting parts.

[0041] In some embodiments, the grass trimmer head may be equipped with several different types of counterweight pins 3 (which may be conventional standard parts or special parts) when it leaves the factory, for users to choose as spare parts according to actual needs. Alternatively, the grass trimmer head may not be equipped with the counterweight pin 3 when it leaves the factory. In this case, during use, the user can choose to own or purchase a suitable type of counterweight pin 3 according to actual needs, and then adjust the overall dynamic balance of the grass trimmer head.

[0042] See also Figure 1 In some embodiments, the latch seat 4 can be an integral injection-molded structure with the housing, and each latch seat 4 is a bar-shaped protrusion protruding from the inner side surface of the annular side wall 1, and the axial direction of the plug hole 401 of the latch seat 4 is parallel to the axial direction of the central positioning shaft 6. Therefore, the counterweight pin 3 can be easily placed in the plug hole 401 of the latch seat 4. However, it is not limited to this. In other specific embodiments, the latch seat 4 or its plug hole 401 can also be tilted according to actual needs, as long as the latch seat 4 can be fixed relative to the housing, the installation and removal of the counterweight pin 3 can be facilitated, and dynamic balance can be achieved.

[0043] In some embodiments, two latch seats 4 may be provided on the inner side of the annular side wall 1 of the grass trimmer housing, and the two latch seats 4 are respectively a first latch seat and a second latch seat. In this case, the first latch seat and the second latch seat are symmetrically provided on both sides of the longitudinal section where the central axis of the outlet hole 2 is located, and the lengths of the counterweight pins 3 placed in the first latch seat and the second latch seat are generally equal. For details, please refer to Figure 2, on the horizontal projection plane, the line connecting the center of the socket of the first pin seat and the center of the central positioning axis 6 is recorded as the first line L1, and the line connecting the center of the socket of the second pin seat and the center of the central positioning axis 6 is recorded as the second line L2. The angle a between the first line L1 and the second line L2 can be any value in the range of 10° to 30°. In other words, on the horizontal projection plane, the line connecting the center of the outlet hole 2 and the center of the central positioning axis 6 is recorded as the first axis L0, and the angles between the first line L1 and the second line L2 and the first axis L0 are both a / 2, and a / 2 can be any value in the range of 5° to 15°. For example, in some embodiments, a=21° and a / 2=10.5°. However, it is not limited to this. In other specific embodiments, a can also be designed to other angle values; or, in other specific embodiments, more pin seats 4 can also be arranged side by side along the inner wall of the shell, so that more counterweight pins 3 can be selected according to actual needs. For example, three counterweight pins 3 are arranged side by side along the inner wall of the shell. At this time, the first axis L0 passes through the middle latch seat 4, and the latch seats 4 on the left and right sides are symmetrical about the first axis L0.

[0044] In specific implementation, among the multiple pin seats 4 of the above-mentioned grass trimmer head, the hole diameters and hole depths of the multiple pin seats 4 are consistent. Alternatively, in other embodiments, the multiple pin seats 4 may have different hole diameters / hole depths, but at least the hole 401 of any pin seat 4 has the same hole diameter and hole depth as the hole 401 of another pin seat 4 arranged symmetrically therewith.

[0045] For further information, see Figure 1 In order to ensure the connection strength between the latch seat 4 and the annular side wall 1 of the shell and the structural stability of the annular side wall 1, a reinforcing rib 5 is protruded from the inner side of the annular side wall 1, and reinforcing ribs 5 are respectively provided on both sides of each latch seat 4 and connected thereto.

[0046] In some embodiments, the annular side wall 1, the latch seat 4, and the reinforcing rib 5 are an integral injection-molded structure. However, this is not limiting. In other specific embodiments, the latch seat 4 may be provided in the mower housing in other ways, such as welding, bonding, or fastener connection. In addition, the connection between the latch seat 4 and the annular side wall 1 of the housing may be strengthened and stabilized in other ways, such as by reinforcing the position with a triangular reinforcing plate or a bracket.

[0047] In some embodiments, at least part of the counterweight pin 3 is made of metal. Therefore, during use, since the counterweight pin 3 made of metal is of greater mass and multiple counterweight pins 3 can be arranged in the mowing head housing, the dynamic balance of the mowing head with a larger eccentric center of gravity can be adjusted. Among them, the counterweight pin 3 can be a standard part directly purchased, and its size and weight are more precise than those of metal sheets, and the error is very small when calculating the dynamic balance. Specifically, the counterweight pin 3 is a pin with a standard size, and the socket 401 of the pin seat 4 can be adapted to pins of various specifications.

[0048] During specific implementation, the user can insert a counterweight pin 3 in each latch seat 4 according to actual conditions, or can also choose to set the counterweight pin 3 in some of the latch seats 4. Moreover, during specific implementation, counterweight pins 3 of different lengths can be selected, or different numbers of counterweight pins 3 can be used until the purpose of adjusting the overall dynamic balance of the grass trimming head assembly is achieved. It can be seen that the grass trimming head provided by the embodiment of the utility model can adopt a new type of dynamic balance adjustment method, which is more flexible in the selection of the counterweight pin 3. When using grass trimming ropes of different diameters and specifications, the dynamic balance adjustment is also different. At this time, counterweight pins 3 of different specifications can be selected for assembly.

[0049] In summary, an embodiment of the utility model further provides a lawn mower, which is provided with the above-mentioned grass trimming head.

[0050] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0051] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grass trimmer head, comprising a housing, wherein the annular side wall (1) of the housing is provided with a wire outlet hole (2) for extending a grass trimmer rope (7), characterized in that: The inner side surface of the annular side wall (1) is provided with a plurality of latch seats (4) arranged in a circumferential direction for accommodating a counterweight pin (3); The plurality of latch seats (4) are symmetrically arranged with the longitudinal section where the central axis of the outlet hole (2) is located as a symmetry reference, and the counterweight area formed by the plurality of latch seats (4) and the outlet hole (2) are respectively located on both sides of the central positioning axis (6) of the housing.

2. The mowing head according to claim 1, characterized in that: The latch seat (4) is a strip-shaped protrusion protruding from the inner side surface of the annular side wall (1), and the axial direction of the insertion hole (401) of the latch seat (4) is parallel to the axial direction of the central positioning axis (6).

3. The mowing head according to claim 1, characterized in that: The inner side surface of the annular side wall (1) is provided with two latch seats (4), which are a first latch seat and a second latch seat; On a horizontal projection plane, a line connecting the center of the socket of the first pin seat and the center of the central positioning axis (6) is recorded as a first line (L1), and a line connecting the center of the socket of the second pin seat and the center of the central positioning axis (6) is recorded as a second line (L2), and an angle between the first line (L1) and the second line (L2) is any value within a range of 10° to 30°.

4. The mowing head according to claim 3, characterized in that: The angle is 21°.

5. The mowing head according to claim 1, characterized in that: Among the plurality of latch seats (4), the insertion hole (401) of any one of the latch seats (4) has the same hole diameter and the same hole depth as the insertion hole (401) of another latch seat (4) symmetrically arranged therewith.

6. The mowing head according to claim 1, characterized in that: The inner side surface of the annular side wall (1) is also provided with a protruding reinforcement rib (5); The reinforcing ribs (5) are respectively arranged on both sides of each of the latch seats (4) and are connected thereto.

7. The mowing head according to claim 6, characterized in that: The annular side wall (1), the latch seat (4) and the reinforcing rib (5) are an integral injection-molded structure.

8. The grass trimmer head according to any one of claims 1 to 7, characterized in that: In the counterweight pin (3), at least a partial area is made of metal material.

9. The grass trimmer head according to any one of claims 1 to 7, characterized in that: The counterweight pin (3) is a pin with a standard size, and the insertion hole (401) of the pin seat (4) can be adapted to pins of various different specifications.

10. A lawn mower, characterized in that: A grass trimming head as described in any one of claims 1 to 9 is provided.

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