beater head

Abstract

This disclosure provides a grass trimmer head, comprising: a housing having at least one pair of outer threading holes for grass trimming rope to pass through; and a spool pivotally disposed within the housing about a fixed axis, having at least one pair of inner threading holes for grass trimming rope to pass through. The grass trimmer head includes a winding mode and a trimming mode, wherein the spool rotates relative to the housing about a fixed axis to switch between the winding mode and the trimming mode. In the winding mode, the outer and inner threading holes are arranged opposite each other in the circumferential direction of the grass trimmer head; in the trimming mode, the outer and inner threading holes are staggered in the circumferential direction of the grass trimmer head. The grass trimmer head of this disclosure adjusts the relative positions of the outer and inner threading holes in both the trimming and winding modes, making it easier for the grass trimming rope to pass through the inner and outer threading holes in the winding mode; and in the trimming mode, the grass trimming rope avoids the wall of the inner threading hole, preventing the grass trimming rope from abrading the inner threading hole.

Description

Technical Field

[0001] This disclosure relates to the field of power tool technology, and in particular to grass trimmers. Background Technology

[0002] A lawn mower is an electric tool used to trim lawns; a lawn mower includes a mowing head, which rotates at high speed to drive the mowing ropes mounted on it to rotate and achieve the cutting function.

[0003] The grass trimmer head includes an outer casing and a spool inside the casing. The outer casing has an outer threading hole, and the spool has an inner threading hole. The grass trimming rope passes through the inner and outer threading holes. When the grass trimmer head is in winding mode and grass trimming mode, the inner and outer threading holes are arranged opposite each other in the circumference of the grass trimmer head. Utility Model Content

[0004] In view of this, the purpose of this disclosure is to propose a grass trimming head that solves the problem of friction between the grass trimming rope and the inner wire hole wall during the rotation of the grass trimming head, and avoids situations such as wire melting and wire jamming during use.

[0005] To achieve one of the above objectives, this disclosure provides a hay trimmer head, comprising: a housing having at least one pair of external threading holes for hay trimming ropes to pass through;

[0006] A spool is pivotally disposed within the housing about a fixed axis and has at least one pair of internal threading holes for the straw rope to pass through.

[0007] The mowing head includes a winding mode and a mowing mode. The spool rotates relative to the outer shell around the fixed axis to switch the mowing head between the winding mode and the mowing mode.

[0008] In the winding mode, the outer threading hole and the inner threading hole are arranged opposite each other in the circumferential direction of the straw trimmer.

[0009] In the mowing mode, the outer threading hole and the inner threading hole are staggered in the circumferential direction of the mowing head.

[0010] As a further improvement of the embodiments of this disclosure, in the winding mode, the inner threading hole is exposed at the outer threading hole, and the inner threading hole and the outer threading hole have an overlapping area in the circumferential direction of the hay-cutting head, and the overlapping area can at least allow the hay-cutting rope to pass through.

[0011] In the mowing mode, the inner threading hole is covered by the outer casing and is not exposed at the outer threading hole.

[0012] As a further improvement to the embodiments of this disclosure, the bobbin includes a winding shaft body and an annular first coil connected to the winding shaft body, with a winding cavity formed on the upper and / or lower side of the first coil.

[0013] The inner threading hole is provided on the first spool. The inner threading hole includes a first hole wall and a second hole wall that are arranged opposite each other in the axial direction of the spool. The two ends of the first hole wall and the second hole wall are connected to the first spool through a transition portion.

[0014] In the mowing mode, the outer threading hole is opposite to the first spool except for the first hole wall and the second hole wall. The mowing rope extends from above or below the first spool except for the first hole wall and the second hole wall to the outer threading hole, and passes through the outer threading hole to the outside of the housing.

[0015] As a further improvement of the embodiments of this disclosure, the spool also includes a second spool and a third spool disposed on both sides of the first spool in the axial direction of the spool, a first winding cavity is formed between the first spool and the second spool, and a second winding cavity is formed between the first spool and the third spool.

[0016] As a further improvement to the embodiments of this disclosure, the grass trimmer includes an alignment component disposed between the housing and the spool;

[0017] The alignment assembly includes a housing alignment member and a spool alignment member. The alignment assembly is configured such that the housing alignment member is aligned with the spool alignment member, such that the outer threading hole and the inner threading hole are arranged opposite each other in the circumferential direction of the straw trimmer.

[0018] As a further improvement to the embodiments of this disclosure, the alignment component includes a protrusion disposed on one of the housing and the spool and a groove disposed on the other of the housing and the spool.

[0019] As a further improvement to the embodiments of this disclosure, the trimming head further includes a positioning component disposed between the outer casing and the spool, the positioning component being configured as follows:

[0020] In the winding mode, the spool is allowed to rotate relative to the housing;

[0021] In the mowing mode, the outer casing rotates synchronously with the spool.

[0022] As a further improvement to the embodiments of this disclosure, the positioning component includes a stop member disposed on one of the housing and the spool, and a positioning member disposed on the other of the housing and the spool, wherein the stop member includes a stop wall;

[0023] In the winding mode, the stop wall disengages from the positioning member, thereby allowing the spool to rotate relative to the housing;

[0024] In the mowing mode, the stop wall abuts against the positioning member to stop the rotation of the spool relative to the outer casing in the first direction, thereby causing the outer casing and the spool to rotate synchronously.

[0025] As a further improvement of the embodiments of this disclosure, the stop member further includes a guide slope, which is configured to guide the positioning member to slide along the guide slope when the stop member rotates relative to the positioning member in a second direction opposite to the first direction, so that the positioning member is not stopped by the stop member, thereby allowing the spool to rotate relative to the housing in a second direction opposite to the first direction.

[0026] To achieve the above objectives, this disclosure also provides a hay trimmer head, comprising: a housing having at least one pair of external threading holes for hay trimming ropes to pass through;

[0027] A spool is pivotally disposed within the housing about a fixed axis, and has at least one pair of internal threading holes for the straw rope to pass through.

[0028] The bobbin includes a winding shaft body and a first coil connected to the winding shaft body, with a winding cavity formed on the upper and / or lower side of the first coil.

[0029] The inner threading hole is provided on the first spool, and the inner threading hole includes a first hole wall and a second hole wall that are disposed opposite each other in the axial direction of the spool.

[0030] Along the axial direction of the spool, the distance from the highest point of the outer thread hole wall to the upper surface of the first hole wall is not greater than the diameter of the straw rope, and the distance from the highest point of the outer thread hole wall to the upper surface of the first spool is not less than the diameter of the straw rope.

[0031] And / or, along the axial direction of the spool, the distance from the lowest point of the outer threading hole wall to the lower surface of the second hole wall is not greater than the diameter of the straw rope, and the distance from the lowest point of the outer threading hole wall to the lower surface of the first spool is not less than the diameter of the straw rope.

[0032] The grass trimmer provided in this disclosure adjusts the relative positions of the outer and inner threading holes in both grass trimming and winding modes. In winding mode, this facilitates the insertion and exit of the grass trimming rope through the inner and outer threading holes. In grass trimming mode, the grass trimming rope avoids the wall of the inner threading hole, preventing the grass trimming rope from abrading the inner threading hole. Attached Figure Description

[0033] Figure 1 This is a front view of the overall structure of the grass trimmer provided in one embodiment of the present disclosure;

[0034] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the grass trimmer in the winding mode.

[0035] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the hay-cutting head in hay-cutting mode.

[0036] Figure 4 for Figure 1 A cross-sectional structural diagram of the grass trimmer.

[0037] Figure 5 for Figure 1 The diagram shows the structure of the bobbin.

[0038] Figure 6 for Figure 4 Enlarged structural diagram at point A;

[0039] Figure 7 for Figure 1 The diagram shows the structure of the upper shell.

[0040] Reference numerals: 10, outer casing; 11, outer threading hole; 12, upper casing; 13, lower casing; 20, spool; 21, inner threading hole; 211, first hole wall; 212, second hole wall; 213, irregular opening; 22, first coil; 23, winding cavity; 24, second coil; 25, third coil; 31, outer casing alignment piece; 32, spool alignment piece; 41, positioning piece; 42, stop piece; 421, stop wall; 422, guide slope; 50, drive shaft; 61, second positioning piece; 62, second stop piece; 70, elastic element; 80, knob. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0042] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] Lawn trimmers are widely used in landscaping, lawn mowing, urban street greening, garden trimming, and vegetation maintenance in parks, football fields, private villa gardens, and agricultural and forestry farms. They are handheld tools used to cut weeds in lawns, gardens, pastures, and other areas. They can also be used to cut green (dry) corn stalks, rice straw, and various crop stalks and forage. Taking a common handheld lawn trimmer as an example, it mainly consists of an engine (or motor), transmission mechanism, trimming head, handle, and safety device. The engine or motor provides power, the transmission mechanism transmits power to the trimming head, and the handle is used by the operator to hold and control the lawn trimmer.

[0044] The performance of the grass trimmer directly affects the effect and efficiency of grass cutting; rope-type grass trimmers are lightweight and suitable for trimming softer weeds, and can be operated flexibly in relatively narrow spaces and complex terrains.

[0045] In existing technology, when the exposed threading holes at both ends of the trimming rope are of equal length, the spool rotates relative to the outer casing to wind the trimming rope onto the spool; then, the trimming head is driven to rotate the trimming rope to achieve the cutting function. In existing technology, when the trimming head is in winding and trimming mode, the inner and outer threading holes are positioned opposite each other in the circumferential direction of the trimming head. During the high-speed rotation of the trimming rope, the rope rubs against the wall of the inner threading hole. After prolonged use, the trimming rope and the hole wall wear against each other, causing pits in the hole wall. In severe cases, this can tear the hole wall, leading to problems such as wire melting and jamming, affecting the normal operation of the trimmer.

[0046] To solve the aforementioned problems of existing grass trimming methods, combined with Figure 1 and Figure 7As shown, this disclosure proposes a hay trimmer, comprising: a housing 10 having at least one pair of external threading holes 11 for passing hay trimming ropes; and a spool 20 pivotally disposed within the housing 10 about a fixed axis Y, having at least one pair of internal threading holes 21 for passing hay trimming ropes. The hay trimmer includes a winding mode and a hay trimming mode, wherein the spool 20 rotates relative to the housing 10 about the fixed axis to switch between the winding mode and the hay trimming mode. In the winding mode, the external threading holes 11 and the internal threading holes 21 are arranged opposite each other in the circumferential direction of the hay trimmer; in the hay trimming mode, the external threading holes 11 and the internal threading holes 21 are staggered in the circumferential direction of the hay trimmer.

[0047] In both the mowing and winding modes, the relative positions of the outer threading hole 11 and the inner threading hole 21 of the present disclosure are adjusted so that in the winding mode, the mowing rope can easily pass through the inner and outer threading holes; in the mowing mode, the mowing rope avoids the hole wall of the inner threading hole 21, thus preventing the mowing rope from abrading the inner threading hole 21.

[0048] In the feasible method disclosed herein, combined with Figure 2 , Figure 3 As shown, the inner and outer opposite arrangement means that in the winding mode, the inner wire hole 21 is exposed at the outer wire hole 11, and the inner wire hole 21 and the outer wire hole 11 have an overlapping area in the circumferential direction of the trimmer head, and the overlapping area can at least allow the trimmer rope to pass through; the inner and outer staggered arrangement means that in the trimmer mode, the inner wire hole 21 is covered by the outer shell 10 and is not exposed at the outer wire hole 11.

[0049] Here, the inner and outer relative arrangement can be understood as the inner threading hole 21 having an opening along the circumference of the spool 20 and the outer threading hole 11 having an opening along the circumference of the outer shell 10 overlapping each other. The overlapping portion can at least accommodate the straw rope passing through the corresponding inner and outer threading holes. In the preferred embodiment of this disclosure, when the outer threading hole 11 and the inner threading hole 21 are arranged circumferentially opposite each other, the centers of the inner threading hole 21 and the outer threading hole 11 are aligned in the circumferential direction of the spool, and the axes of the two outer threading holes 11 coincide with the axes of the two inner threading holes, and both axes pass through the fixed axis; thus, the straw rope can pass through the outer shell 10 and the spool 20 unimpeded.

[0050] The staggered arrangement can be understood as follows: the opening of the inner threading hole 21 along the circumference of the spool 20 and the opening of the outer threading hole 11 along the circumference of the outer shell do not overlap, or the overlapping portion is insufficient to allow the straw rope to pass through. In the specific example of this disclosure, the opening of the inner threading hole 21 along the circumference of the spool 20 and the opening of the outer threading hole 11 along the circumference of the outer shell do not overlap.

[0051] like Figure 4As shown, the outer casing 10 includes an upper casing 12 and a lower casing 13, which are connected to each other to form a space for accommodating the spool 20. The upper casing 12 and the lower casing 13 can be connected in various ways, such as snap-fit ​​connection, adhesive, screw fixing, etc. In one embodiment of this disclosure, the upper casing 12 and the lower casing 13 are snap-fit ​​connected, which facilitates disassembly and installation. Of course, in other embodiments of this disclosure, the outer casing 10 can also be integrally formed on the outside of the spool 20 when the spool 20 is installed, forming a disposable grass trimming head, and the specific method is not limited.

[0052] A pair of external wire holes 11 are arranged opposite each other along the radial direction of the housing 10, and the center line of the external wire holes 11 passes through the fixed axis of the housing 10.

[0053] The external wiring hole 11 is part of the outer shell 10. The external wiring hole 11 and the outer shell 10 can be integrally formed or they can be connected separately using different materials. In the specific example of this disclosure, the external wiring hole 11 is detachably connected to the outer shell 10, and the external wiring hole 11 is made of metal.

[0054] like Figure 5 As shown, in one embodiment of this disclosure, the bobbin 20 includes a winding bobbin body and an intermediate bobbin connected to the winding bobbin body. The intermediate bobbin forms winding cavities 23 on both sides of the bobbin 20 in the axial direction.

[0055] Optionally, the spool 20 specifically includes a winding spool body and an annular first coil 22 connected to the winding spool body; a winding cavity 23 is formed on the upper and / or lower side of the first coil 22.

[0056] Optionally, two winding cavities 23 are formed on the upper and lower sides of the first coil 22. The spool 20 also includes a second coil 24 and a third coil 25 disposed on both sides of the first coil 22 along the axial direction of the spool 20. The winding cavities include: a first winding cavity formed between the first coil 22 and the second coil 24, and a second winding cavity formed between the first coil 22 and the third coil 25.

[0057] Combination Figure 2 , Figure 3 As shown, in one embodiment of this disclosure, an inner thread hole 21 is provided on the spool 20. A pair of inner thread holes 21 are arranged opposite each other along the radial direction of the spool, and the center line connecting the inner thread holes 21 passes through the fixed axis.

[0058] In a preferred embodiment of this disclosure, combined with Figure 5As shown, the inner threading hole 21 is provided on the first wire spool 22. The inner threading hole 21 includes a first hole wall 211 and a second hole wall 212 that are arranged opposite each other in the axial direction of the spool 20. The two ends of the first hole wall 211 and the second hole wall 212 are connected to the first wire spool 22 through a transition portion. The through opening between the first hole wall 211 and the second hole wall 212 forms the inner threading hole 21.

[0059] In the mowing mode, the outer threading hole 11 is opposite to the first coil 22 other than the first hole wall 211 and the second hole wall 212. The mowing rope extends from above or below the first coil 22 other than the first hole wall 211 and the second hole wall 212 to the outer threading hole 11 and passes through the outer threading hole 11 to the outside of the outer casing 10.

[0060] In one embodiment of this disclosure, combined with Figure 2 , Figure 3 As shown, the winding shaft body has two internal threading holes 21 connected to form a threading channel. The shape of the threading channel can be adjusted as needed. A pivot hole is opened axially on the winding shaft body. In the specific example of this disclosure, the threading channel is a curved channel, which is opened around the pivot hole of the winding shaft body. Two threading channels are symmetrically opened. When threading the straw rope, it can choose to pass through either threading channel and extend outside the winding shaft body. A partition can also be set in the internal threading hole 21 to divide each internal threading hole 21 into two threading holes corresponding to the two threading channels, which is conducive to the straw rope passing through. In addition, an irregularly shaped opening 213 is opened on the internal threading hole 21 to connect to the winding cavity 23, which is conducive to the straw rope being wound from the internal threading hole 21 into the winding cavity 23 of the winding shaft body.

[0061] When threading the straw rope, it enters sequentially through an outer threading hole 11, passes through an inner threading hole 21 opposite to the outer threading hole 11, enters the threading channel, and then exits sequentially through another inner threading hole 21 and its opposite outer threading hole 11. During threading, both ends of the straw rope extend outside the spool 20 at the two inner threading holes 21, and finally extend outside the outer casing 10 through the outer threading hole 11. During winding, the outer casing 10 rotates relative to the spool 20, and the straw rope winds around the two winding cavities 23 until the ends of the straw rope are at a predetermined length relative to the outer threading holes 11, at which point the outer casing 10 stops rotating relative to the spool 20. In this way, during winding, the two ends of the straw rope are respectively housed in different winding cavities 23, preventing the straw rope from tangling during winding and facilitating subsequent rope release.

[0062] Preferably, the inner threading hole 21 is part of the spool 20. The inner threading hole 21 and the spool 20 can be integrally formed or they can be made of different materials and connected separately. In the specific example of this disclosure, the inner threading hole 21 and the spool 20 are integrally formed and made of plastic material.

[0063] In a preferred embodiment of this disclosure, for ease of description, the circumferential length direction of the spool is defined as the width direction of the inner threading hole 21 and the outer threading hole 11, and the axial direction of the spool is defined as the height direction of the inner threading hole 21 and the outer threading hole 11. The width of the inner threading hole 21 is greater than the width of the outer threading hole 11. When the grass trimmer head is assembled, the inner threading hole 21 is located inside the outer threading hole 11, making it difficult to determine the specific position of the inner threading hole 21 when winding the grass trimmer rope. Setting the width of the inner threading hole 21 to be greater than the width of the outer threading hole 11 improves the threading efficiency of the grass trimmer rope when passing through the outer threading hole 11 into the inner threading hole 21.

[0064] In a preferred embodiment of this disclosure, along the axial direction of the spool 20, the distance from the highest point of the outer threading hole 11 wall to the upper surface of the first hole wall 211 is not greater than the diameter of the straw rope, and the distance from the highest point of the outer threading hole 11 wall to the upper surface of the first spool 22 is not less than the diameter of the straw rope; and / or, along the axial direction of the spool, the distance from the lowest point of the outer threading hole 11 wall to the lower surface of the second hole wall 212 is not greater than the diameter of the straw rope, and the distance from the lowest point of the outer threading hole 11 wall to the lower surface of the first spool 22 is not less than the diameter of the straw rope. In mowing mode, the outer threading hole 11 and the inner threading hole 21 are staggered in the circumferential direction; the part of the mowing rope between the outer casing 10 and the spool 20 is located in the gap between the outer threading hole 11 and the upper side of the first spool 22, or in the gap between the outer threading hole 11 and the lower side of the first spool 22; the end of the mowing rope remains outside the outer casing 10; the mowing rope rotates synchronously with the outer casing 10 and the spool 20; when the mowing head performs mowing work, it avoids wear on the spool 20, thereby avoiding the formation of dents on the surface of the spool 20 and reducing problems such as wire shrinkage and melting.

[0065] In the feasible method disclosed herein, combined with Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, the hay trimmer includes a winding mode and a hay trimming mode; the hay trimmer includes an alignment component disposed between the outer casing 10 and the spool 20; the alignment component includes an outer casing alignment member 31 and a spool alignment member 32, the alignment component being configured such that the outer casing alignment member 31 and the spool alignment member 32 are aligned, such that the outer threading hole 11 and the inner threading hole 21 are arranged opposite each other in the circumferential direction of the hay trimmer. This facilitates the insertion of the hay trimming rope.

[0066] Preferably, the housing alignment member 31 and the spool alignment member 32 are respectively disposed on the opposing surfaces of the housing 10 and the spool 20. Specifically, the alignment assembly includes a protrusion disposed on one of the housing 10 and the spool 20 and a groove disposed on the other of the housing 10 and the spool 20. During relative rotation of the housing 10 and the spool 20, when the protrusion and the groove engage with each other, the housing 10 and the spool 20 are relatively fixedly connected, and the outer threading hole 11 and the inner threading hole 21 are arranged opposite each other in the circumferential direction. When the protrusion and the groove separate from each other, the housing 10 and the spool 20 can rotate relative to each other, thereby causing the outer threading hole 11 and the inner threading hole 21 to be staggered in the circumferential direction, so as to facilitate the mowing head to perform the mowing work.

[0067] In a specific example of this disclosure, the alignment component is disposed between the upper housing 12 and the spool 20, the spool alignment member 32 is a protrusion disposed on the spool 20, and the outer housing alignment member 31 is a groove disposed on the outer housing 10.

[0068] The number of housing alignment parts 31 and spool alignment parts 32 is the same; their number can be specifically set as needed; in a specific example of this disclosure, the number of housing alignment parts 31 and spool alignment parts 32 is set to 2, and the housing alignment parts 31 and spool alignment parts 32 are symmetrically arranged along the axis of the spool 20.

[0069] It is understandable that the spool alignment piece 32 is a protrusion set on the spool 20. The spool alignment piece 32 protrudes from the second spool 24. When the outer shell alignment piece 31 and the spool alignment piece 32 are engaged, the feeling of engagement prompts the user that the outer thread hole 11 and the inner thread hole 21 are arranged opposite each other in the circumferential direction of the trimmer head. Furthermore, by slightly driving the spool 20 to rotate, the outer shell alignment piece 31 and the spool alignment piece 32 can be disengaged.

[0070] In the feasible method disclosed herein, combined with Figures 5 to 7 As shown, the hay trimmer includes a positioning component disposed between the housing 10 and the spool 20. The positioning component is configured such that, in the winding mode, the spool 20 is allowed to rotate relative to the housing 10; the hay trimmer follows the rotation of the spool 20 and is wound in the two winding cavities 23 formed by the winding spool body; in the hay trimming mode, the positioning component causes the housing 10 and the spool 20 to rotate synchronously, and the hay trimmer remaining outside the housing 10 rotates with the entire hay trimmer to cut the grass on the outside.

[0071] In a preferred embodiment of this disclosure, the positioning component includes a stop 42 disposed on one of the housing 10 and the spool 20 and a positioning member 41 disposed on the other of the housing 10 and the spool 20; the stop includes a stop wall 421; in the winding mode, the stop wall 421 disengages from the positioning member 41, thereby allowing the spool 20 to rotate relative to the housing 10; in the weeding mode, the stop wall 421 abuts against the positioning member 41 to stop the rotation of the spool 20 relative to the housing 10 in a first direction, thereby causing the housing 10 and the spool 20 to rotate synchronously.

[0072] Figure 5 The X direction is defined as the first direction, that is, the direction of the counterclockwise rotation of the grass trimmer head is defined as the first direction. Of course, according to the content of this disclosure, the direction of the clockwise rotation of the grass trimmer head can be defined as the first direction, and the direction of the positioning component can be adjusted synchronously. This will not be elaborated here.

[0073] This disclosure may include specific examples, combined with Figures 5 to 7 As shown, the positioning component is disposed between the upper housing 12 and the spool 20. The positioning member 41 is disposed on the upper housing 12, and the stop member 42 is disposed on the spool 20. Specifically, the positioning member 41 and the stop member 42 are respectively disposed on the opposite surfaces of the upper housing 12 and the spool 20.

[0074] Preferably, the alignment component and the positioning component do not overlap their paths as they rotate with the housing and spool, thus avoiding mutual interference. In a specific example of this disclosure, the positioning component is positioned near the inner periphery of the housing, and the alignment component is positioned near the outer periphery of the housing.

[0075] Preferably, the stop wall 421 is a vertical surface; the stop member 42 further includes a guide slope 422, which is configured to guide the positioning member 41 to slide along the guide slope 422 when the stop member 42 rotates relative to the positioning member 41 in a second direction opposite to the first direction, so that the positioning member 41 is not stopped by the stop member 42, thereby allowing the spool 20 to rotate relative to the housing 10 in a second direction opposite to the first direction.

[0076] It is understood that multiple positioning elements 41 and stop elements 42 can be configured to match each other, and the multiple positioning elements 41 and stop elements 42 are arranged in a ring around the circumference of the housing 10 and the spool 20. The multiple positioning elements 41 and stop elements 42 are evenly spaced around the circumference of the housing 10 and the spool 20.

[0077] In the specific example disclosed herein, the number of positioning elements 41 and stop elements 42 are each set to 6.

[0078] Preferably, the opening width of the inner threading hole 21 is rotated by an angle α relative to the spool 20, and the position of the stop wall 421 is excluded from the rotation angle α corresponding to the inner threading hole 21. In this way, in the grass cutting mode, when the stop wall 421 and the positioning member 41 stop each other, the inner threading hole 21 and the outer threading hole 11 are staggered inward and outward in the circumferential direction of the grass cutting head.

[0079] In the specific implementable method disclosed herein, combined with Figure 4 As shown, the grass trimmer includes a motor-driven drive shaft 50, which drives the bobbin 20 to pivot around a fixed axis. Specifically, the drive shaft 50 is fitted with a pivot hole embedded in the bobbin body. Under the drive of the motor, the drive shaft 50 drives the bobbin 20 to rotate in a first direction or a second direction.

[0080] The hay trimmer also includes: a knob 80 disposed on the outer casing of the upper housing 12, a second positioning component disposed between the lower housing 13 and the spool 20, and an elastic element 70; the knob 80 is connected to the drive shaft 50, and the knob 80 can be manually and / or electrically opened, and the control knob 80 drives the drive shaft 50 to rotate; the second positioning component includes a second positioning element 61 disposed on one of the lower housing 13 and the spool 20 and a second stop element 62 disposed on the other; in the winding mode and the hay trimming mode, the second positioning element 61 and the second stop element 62 are completely separated in the axial direction of the hay trimmer, the lower housing 13 and the spool 20 are separated from each other in the axial direction, and the spool 20 can rotate relative to the lower housing 13.

[0081] The grass-cutting head also includes a line-laying mode. In the line-laying mode, the second positioning member 61 and the second stop member 62 cooperate to control the line-laying length. The number of the second positioning member 61 and the second stop member 62 is set to be the same, and their number can be specifically set as needed. The position setting of the second positioning member 61 and the second stop member 62 is related to the line-laying length. Taking the second stop member 62 as an example, the more second stop members 62 are set, the shorter the line-laying length per time. In the specific example of this disclosure, the number of the second positioning member 61 and the second stop member 62 is set to 6.

[0082] Preferably, the number of positioning components and the number of second positioning components are set to be the same to ensure that the length of the wire is consistent each time in the wire feeding mode.

[0083] Preferably, the stop member 42 has a first projection on the plane where the second reel 24 is located, and the second stop member 62 has a second projection on the plane where the third reel 25 is located. The first projection and the second projection do not coincide in the rotation direction of the spindle 20, so as to avoid the second positioning member 61 and the second stop member 62 colliding in the direction along the fixed axis of the spindle 20 during the wire feeding mode, which would affect the wire feeding length.

[0084] Preferably, in the winding mode, the distance that the stop 42 moves in the direction of the fixed axis is less than the distance that the second stop 62 and the second positioning member 61 move in the direction of the fixed axis. In this way, the second positioning member 61 and the second stop 62 cooperate with each other during the winding process, which affects the movement of the spool 20 relative to the housing 10.

[0085] In this specific embodiment, the grass-cutting head operates in three modes: winding mode, grass-cutting mode, and line-releasing mode; the spool 20 rotates relative to the outer casing 10 around a fixed axis to switch the grass-cutting head between the three modes.

[0086] In the winding mode, when the outer shell alignment member 31 and the spool alignment member 32 of the alignment assembly cooperate with each other, the outer threading hole 11 and the inner threading hole 21 are arranged opposite each other in the circumferential direction, and the straw rope can pass smoothly through the outer threading hole 11 and the inner threading hole 21. When the end of the straw rope is fully extended out of the outer threading hole 11 and straightened, the winding preparation is completed. Further, the control knob 80 is turned on to drive the drive shaft 50 to rotate, and the positioning member 41 slides along the guide slope 422, allowing the drive shaft 50 to drive the spool 20 to rotate relative to the outer shell 10 in the second direction. Correspondingly, the straw rope follows the rotation of the spool 20 and is wound around the two winding cavities 23 formed by the winding shaft body along the irregular opening 213.

[0087] In the mowing mode, the drive spool 20 rotates relative to the outer shell 10 in the first direction. When the stop wall 421 abuts against the positioning member 41, it stops the rotation of the spool 20 relative to the outer shell 10 in the first direction. The outer shell 10 and the spool 20 are fixed relative to each other. The motor drives the drive shaft 50 to continue rotating so as to drive the spool 20 and the outer shell to rotate synchronously in the second direction, so that the mowing rope cuts the weeds.

[0088] In the line-laying mode, the straw rope will wear out during operation. When the straw rope extending from the outer shell 10 breaks, the straw head can be struck to release the line. When the straw head is working, striking the straw head causes the bottom surface of the lower shell 13 to impact the ground away from the upper shell 12. The lower shell 13 compresses the elastic member 70 in the direction away from the ground. During the compression process, the positioning member 41 and the stop member 42 disengage, and the spool 20 can rotate relative to the outer shell 10, causing the straw rope to extend out of the shell. When the second positioning member 61 and the second stop member 62 are pressed together, the spool 20 is fixed relative to the outer shell 10. When the striking stops, the elastic member 70 causes the lower shell 13 and the spool 20 to disengage, and the spool 20 resumes relative rotation with respect to the outer shell 10. The stop wall 421 and the positioning member 41 cooperate again to realize the straw head operation.

[0089] In summary, the grass trimmer provided in this disclosure adjusts the relative positions of the outer and inner threading holes in both the grass trimming and winding modes. This makes it easier for the grass trimming rope to pass through the inner and outer threading holes in the winding mode, and in the grass trimming mode, the grass trimming rope avoids the wall of the inner threading hole, thus preventing the grass trimming rope from abrading the inner threading hole.

[0090] It should be noted that the above description describes some embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that in the above embodiments and still achieve the desired result. In addition, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired result.

[0091] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this disclosure as described above, which are not provided in detail for the sake of brevity.

[0092] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A grass cutting head characterised in that, include: The outer casing has at least one pair of external threading holes for passing through the straw rope; A spool is pivotally disposed within the housing about a fixed axis and has at least one pair of internal threading holes for the straw rope to pass through. The mowing head includes a winding mode and a mowing mode. The spool rotates relative to the outer shell around the fixed axis to switch the mowing head between the winding mode and the mowing mode. In the winding mode, the outer threading hole and the inner threading hole are arranged opposite each other in the circumferential direction of the straw trimmer. In the mowing mode, the outer threading hole and the inner threading hole are staggered in the circumferential direction of the mowing head.

2. The hay trimmer according to claim 1, characterized in that, In the winding mode, the inner threading hole is exposed at the outer threading hole, and the inner threading hole and the outer threading hole have an overlapping area in the circumferential direction of the hay-cutting head, and the overlapping area can at least allow the hay-cutting rope to pass through. In the mowing mode, the inner threading hole is covered by the outer casing and is not exposed at the outer threading hole.

3. The hay trimmer according to claim 1, characterized in that, The bobbin includes a winding shaft body and an annular first coil connected to the winding shaft body, with a winding cavity formed on the upper and / or lower side of the first coil. The inner threading hole is provided on the first spool. The inner threading hole includes a first hole wall and a second hole wall that are arranged opposite each other in the axial direction of the spool. The two ends of the first hole wall and the second hole wall are connected to the first spool through a transition portion. In the mowing mode, the outer threading hole is opposite to the first spool except for the first hole wall and the second hole wall. The mowing rope extends from above or below the first spool except for the first hole wall and the second hole wall to the outer threading hole, and passes through the outer threading hole to the outside of the housing.

4. The hay trimmer according to claim 3, characterized in that, The spool also includes a second spool and a third spool disposed on both sides of the first spool along the axial direction of the spool, a first winding cavity is formed between the first spool and the second spool, and a second winding cavity is formed between the first spool and the third spool.

5. The hay trimmer according to claim 1, characterized in that, The hay trimmer includes an alignment assembly disposed between the outer casing and the spool; The alignment assembly includes a housing alignment member and a spool alignment member. The alignment assembly is configured such that the housing alignment member is aligned with the spool alignment member, such that the outer threading hole and the inner threading hole are arranged opposite each other in the circumferential direction of the straw trimmer.

6. The hay trimmer according to claim 5, characterized in that, The alignment component includes a protrusion on one of the housing and the spool and a groove on the other of the housing and the spool.

7. The hay trimmer according to claim 1, characterized in that, The hay-cutting head further includes a positioning component disposed between the outer casing and the spool, the positioning component being configured as follows: In the winding mode, the spool is allowed to rotate relative to the housing; In the mowing mode, the outer casing rotates synchronously with the spool.

8. The hay trimmer according to claim 7, characterized in that, The positioning component includes a stop member disposed on one of the housing and the spool, and a positioning member disposed on the other of the housing and the spool, wherein the stop member includes a stop wall; In the winding mode, the stop wall disengages from the positioning member, thereby allowing the spool to rotate relative to the housing; In the mowing mode, the stop wall abuts against the positioning member to stop the rotation of the spool relative to the outer casing in the first direction, thereby causing the outer casing and the spool to rotate synchronously.

9. The hay trimmer according to claim 8, characterized in that, The stop further includes a guide ramp, which is configured to guide the positioning member to slide along the guide ramp when the stop rotates relative to the positioning member in a second direction opposite to the first direction, so that the positioning member is not stopped by the stop, thereby allowing the spool to rotate relative to the housing in a second direction opposite to the first direction.

10. A grass trimming head characterized by, include: The outer casing has at least one pair of external threading holes for passing through the straw rope; A spool is pivotally disposed within the housing about a fixed axis, and has at least one pair of internal threading holes for the straw rope to pass through. The bobbin includes a winding shaft body and a first coil connected to the winding shaft body, with a winding cavity formed on the upper and / or lower side of the first coil. The inner threading hole is provided on the first spool, and the inner threading hole includes a first hole wall and a second hole wall that are disposed opposite each other in the axial direction of the spool. Along the axial direction of the spool, the distance from the highest point of the outer thread hole wall to the upper surface of the first hole wall is not greater than the diameter of the straw rope, and the distance from the highest point of the outer thread hole wall to the upper surface of the first spool is not less than the diameter of the straw rope. And / or, along the axial direction of the spool, the distance from the lowest point of the outer threading hole wall to the lower surface of the second hole wall is not greater than the diameter of the straw rope, and the distance from the lowest point of the outer threading hole wall to the lower surface of the first spool is not less than the diameter of the straw rope.

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