Trimmer tool bit and electric trimmer

Abstract

The embodiment of the utility model discloses a trimmer tool bit and an electric trimmer, the trimmer tool bit comprises a tool bit assembly and a tool bit shell set, the tool bit assembly comprises a tool apron and at least one tool bit installed on the tool apron in a floating mode in the vertical direction, and the tool bit comprises an installation frame; one of the mounting frame and the tool apron is provided with a guide rod extending in the vertical direction, and the other one is provided with a guide hole in sliding fit with the guide rod; the guide hole is provided with a guide section, and the width of the cross section of the guide section in the first direction is larger than that in the second direction. The mounting frame is provided with a limiting convex part which is convexly arranged in the first direction; the vertical direction, the first direction and the second direction are vertical pairwise; the tool bit shell set comprises a shell and a buffering lining fixed to the inner wall of the shell, the buffering lining is provided with a matching part, the limiting protruding part can float up and down below the matching part, and when the tool bit is in a floating state, the top face of the limiting protruding part abuts against the matching part. According to the trimmer tool bit, the floating scraping noise of the tool bit assembly is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of trimmers, and in particular to a trimmer head and an electric trimmer. Background Art

[0002] Common electric trimmers include electric shavers and trimmers. To better conform to the user's body contours, current trimmer heads are designed to float relative to the head housing. To enhance the quality, feel, and ease of cleaning, more and more electric trimmers are adopting metal head housings.

[0003] In previous technical solutions, the blade assembly frame is provided with multiple limiting lugs on the front, back, left, and right sides to limit the floating range of the blade assembly. As a result, when the blade assembly floats within the blade housing, it is prone to colliding and scraping against the inner wall of the blade housing, producing a harsh noise.

[0004] The above content is only used to assist in understanding the technical solution of the utility model and does not constitute an admission that the above content is prior art. Utility Model Content

[0005] In view of the above problems, the present invention proposes a trimmer head, which aims to solve the technical problem of loud floating noise caused by the trimmer head assembly.

[0006] To achieve the above-mentioned purpose, the trimmer head proposed in the present invention includes a cutter head assembly and a cutter head shell assembly:

[0007] The cutter head assembly includes a cutter seat and at least one cutter head floatingly mounted on the cutter seat in an up-down direction, the cutter head including a mounting frame; one of the mounting frame and the cutter seat is provided with a guide rod extending in the up-down direction, and the other is provided with a guide hole for sliding engagement with the guide rod; the guide hole has a guide section, the cross-section of the guide section having a width in a first direction greater than a width in a second direction; the mounting frame has a limiting protrusion protruding in the first direction; the up-down direction, the first direction, and the second direction are perpendicular to each other;

[0008] The cutter head housing assembly includes an outer shell and a buffer lining fixed to the inner wall of the outer shell. The buffer lining has a matching portion. The limiting protrusion can float up and down below the matching portion, and when the cutter head is in a floating state, the top surface of the limiting protrusion abuts against the matching portion.

[0009] In one embodiment, the mounting frame includes a frame body and two end covers installed at both ends of the frame body in the first direction, each of the end covers is protruded with the limiting protrusion; the cutter head also includes a stationary knife and a movable knife, the stationary knife is fixedly connected to the frame body, the movable knife is arranged on the inner side of the stationary knife, and can move back and forth relative to the stationary knife along the first direction to achieve cutting; there are two buffer liners, and the two buffer liners are respectively fixed to the inner walls of the two ends of the outer shell in the first direction.

[0010] In one embodiment, there are multiple cutting heads, and the multiple cutting heads are arranged side by side in the second direction, and the end covers at both ends of each cutting head are protruding with the limiting protrusion; the multiple limiting protrusions located at the same end of the first direction are limitedly matched with one of the buffer liners.

[0011] In one embodiment, the mating portion has a first mating surface and a second mating surface, and the second mating surface is higher than the first mating surface; the multiple cutter heads include an intermediate cutter head and side cutter heads arranged on both sides of the intermediate cutter head in the second direction, and the limiting protrusion of the intermediate cutter head is limitedly mated with the first mating surface, and the limiting protrusion of the side cutter head is limitedly mated with the second mating surface.

[0012] In one embodiment, the buffer lining further includes a buffer portion, the matching portion is provided on a side wall surface of the buffer portion facing the cutter head, and the buffer portion forms a floating space below the matching portion for the limiting protrusion to float up and down.

[0013] In one embodiment, the buffer portion is concave toward the side wall surface of the cutter head to enclose the matching portion to form the floating space.

[0014] In one embodiment, an embedding groove is provided on the inner wall of the outer shell, and the buffer lining is adapted to be embedded in the embedding groove.

[0015] In one embodiment, a mounting seat is protruding from the side wall of the embedding groove in the first direction; the buffer lining is provided with a matching groove corresponding to the mounting seat, the mounting seat is adapted to be embedded in the matching groove, and the bottom wall of the mounting seat is exposed from the buffer lining so as to be fixedly connected to the knife seat.

[0016] In one embodiment, the blade seat has a main body and mounting lugs connected to both ends of the main body in a first direction; the blade head is floatingly mounted on the main body along the up and down directions; a mounting groove is provided on the bottom wall of the buffer liner, and the bottom wall of the mounting seat is exposed in the mounting groove; the mounting lug is embedded in the mounting groove and is fixedly connected to the mounting seat.

[0017] In one embodiment, the mounting seat is provided with a mounting hole, the mounting lug is provided with a fixing hole, and the trimmer head further includes a fastener, which passes through the fixing hole and is connected to the mounting hole to fix the blade seat and the blade head shell assembly.

[0018] In one embodiment, the buffer lining further includes extension portions connected to both side edges of the buffer portion in the second direction, and the matching portion and the floating space extend to outer edges of the extension portions in the second direction.

[0019] In one embodiment, the extension portion is provided at a side end of the buffer portion close to the cutter head, and an inner wall surface of the shell is provided with a fixing groove for the extension portion to be adapted and installed.

[0020] In one embodiment, the buffer lining also includes fixing lugs provided on both sides of the mating groove in the second direction; the fixing lugs and the mating portion are respectively provided at the upper and lower ends of the buffer portion; the bottom wall of the outer shell is provided with a limiting groove adapted to the fixing lug; the fixing lug is spaced apart from the extension portion and is clamped by the outer shell.

[0021] In one embodiment, the outer shell is made of metal, and the buffer lining is made of elastic material.

[0022] In one embodiment, a guide hole is provided on the end cover, and the width of the cross section of the guide section in the first direction is gradually increased from bottom to top; or,

[0023] The knife seat is provided with a guide hole, and the width of the cross section of the guide section in the first direction is gradually reduced from bottom to top.

[0024] The present utility model also proposes an electric trimmer, comprising a main unit and a trimmer head as described in any of the above embodiments, wherein the main unit comprises a housing and a drive shaft, the head housing assembly of the trimmer head is connected to the housing, and the drive shaft is connected to the head assembly of the trimmer head.

[0025] The trimmer head of the present invention is mounted on a blade holder in a manner such that the trimmer head can float up and down. The trimmer head has a limiting protrusion protruding in a first direction, and a buffer liner is provided within the housing so that the limiting protrusion and the mating portion of the buffer liner are in a limited position, effectively and reliably limiting the vertical floating amplitude of the trimmer head relative to the blade holder. Compared to direct contact between the limiting protrusion and the housing, the buffer liner can silence and reduce the noise of the limiting protrusion to avoid collision noise caused by the upward and downward floating of the limiting protrusion. When the trimmer head has multiple blades, compared to the method of providing a buffer sleeve on the limiting protrusion to reduce noise, the present invention does not require the precise assembly of multiple buffer sleeves with multiple limiting protrusions. Multiple limiting protrusions can simultaneously contact the buffer liner, thereby reducing manufacturing costs and simplifying installation steps.

[0026] Furthermore, the cutter head and the cutter seat slide vertically together via the guide rod and guide hole. The cross-section of the guide hole has a width in the first direction that is greater than its width in the second direction. This reduces the clearance between the guide rod and the guide hole in the second direction, preventing the entire cutter head from wobbling significantly in the second direction. Consequently, only the limiting protrusions need to be provided on both ends of the cutter head in the first direction, eliminating the need for limiting protrusions on both sides of the cutter head in the second direction. This reduces the number of limiting protrusions on the cutter head, simplifies the cutter head structure, and reduces noise sources. Consequently, a buffer lining only needs to be provided on the inner wall of the limiting protrusion on the corresponding mounting bracket of the housing, which can reduce the volume of the buffer lining and lower manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic structural diagram of an embodiment of a trimmer head of the utility model is shown;

[0029] Figure 2 for Figure 1 Bottom view of the middle trimmer head;

[0030] Figure 3 for Figure 1 A cross-sectional view of the trimmer head at one angle;

[0031] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0032] Figure 5 for Figure 1 A cross-sectional view of the trimmer head from another angle;

[0033] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0034] Figure 7 This is a schematic diagram of the exploded structure of another embodiment of the trimmer head of the utility model;

[0035] Figure 8 for Figure 7 Assembly diagram of the middle cutter head shell assembly;

[0036] Figure 9 for Figure 8 Bottom view of the middle cutter head housing assembly;

[0037] Figure 10 for Figure 8 Schematic diagram of the exploded structure of the middle cutter head shell assembly;

[0038] Figure 11 This is a schematic structural diagram of an embodiment of an electric trimmer of the present utility model;

[0039] Figure 12 for Figure 11 Schematic diagram of the exploded structure of the electric trimmer;

[0040] Figure 13 for Figure 12 Schematic diagram of the structure of the electric trimmer from another angle.

[0041] Description of Figure Numbers:

[0042]

[0043]

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0048] The utility model provides a trimmer head.

[0049] In the embodiment of this utility model, please refer to Figures 1 to 7 The trimmer blade head 120 includes a blade head assembly 100 and a blade head housing assembly 200: the blade head assembly 100 includes a blade holder 110 and at least one blade head 120 floatingly mounted on the blade holder 110 along the up-down direction, the blade head 120 includes a mounting frame 121; one of the mounting frame 121 and the blade holder 110 is provided with a guide rod 111 extending along the up-down direction, and the other is provided with a guide hole 122 for sliding engagement with the guide rod 111; the guide hole 122 has a guide section 123, the cross-section of the guide section 123 has a width in the first direction greater than the width in the second direction; the mounting frame 121 has a limiting protrusion 124 protruding in the first direction; the up-down direction, the first direction and the second direction are perpendicular to each other.

[0050] The cutter head housing assembly 200 includes an outer shell 210 and a buffer lining 220 fixed to the inner wall of the outer shell 210. The buffer lining 220 has a mating portion 221. The limiting protrusion 124 can float up and down below the mating portion 221, and when the cutter head 120 is in a floating state, the top surface of the limiting protrusion 124 abuts against the mating portion 221.

[0051] In this embodiment, the blade holder 110 is used to provide a mounting and connection for the cutter head 120. The blade holder 110 can have many structures and shapes, and can be designed according to the type and number of cutter heads 120, and no specific restrictions are set here. The number of cutter heads 120 can be selected according to actual needs, for example, it can be one, two, or three, and no specific restrictions are set here. The cutter head 120 can be a long-beard cutter head 120 or a short-beard cutter head 120. The mounting frame 121 is used to mount the static blade 125 and other structures of the cutter head 120. The specific structure of the mounting frame 121 can be many, and no specific restrictions are set here. The entire cutter head 120 can float up and down along the guide rod 111. Typically, a spring is mounted on the guide rod 111, so that one end of the spring abuts the blade holder 110 and the other end abuts the mounting frame 121. In this way, the cutter head 120 can elastically float up and down, so that the static blade 125 better fits the user's skin.

[0052] It is understood that the cross-section of the guide segment 123 refers to the plane cut perpendicular to the axis of the guide hole 122. To ensure that the cross-section of the guide segment 123 of the guide hole 122 is wider in the first direction than in the second direction, the cross-section of the guide hole 122 can be specifically a runway or elliptical shape. In this way, the inner circumferential wall of the guide hole 122 forms a smoothly transitioning plane or arc surface, which improves the sliding smoothness of the guide rod 111 within the guide hole 122 and reduces the sliding noise of the guide rod 111 within the guide hole 122. In other embodiments, the cross-section of the guide hole 122 can also be designed to have other shapes.

[0053] Since the fitting clearance between the guide rod 111 and the guide hole 122 in the second direction is reduced, the entire cutter head 120 can be prevented from shaking significantly in the second direction. Therefore, it is only necessary to set limiting protrusions 124 at both ends of the cutter head 120 in the first direction, and there is no need to set limiting protrusions 124 on both sides of the cutter head 120 in the second direction, thereby reducing the number of limiting protrusions 124 on the cutter head 120, thereby reducing collision noise.

[0054] The limiting protrusion 124 can be specifically a lug provided on the peripheral sidewall of the mounting frame 121 in the first direction. Of course, the limiting protrusion 124 can also be a column, etc. The limiting protrusion 124 limits the upward displacement of the cutter head 120, and the blade holder 110 limits the downward displacement of the cutter head 120. Specifically, the lower surface of the limiting protrusion 124 protrudes from the bottom wall of the mounting frame 121. In this way, the limiting protrusion 124 cooperates with the blade holder 110 to limit the downward displacement of the cutter head 120, thereby preventing large-scale collisions between the cutter head 120 and the blade holder 110, thereby reducing noise and wear.

[0055] The outer shell 210 wraps around the outer periphery of the trimmer head assembly 100, forming the exterior appearance of the entire trimmer head 120. The outer shell 210 can be made of metal, which not only enhances the product's texture and feel, but also increases its structural strength and service life, while also making it easier to clean. The cushioning liner 220 can be made of a cushioning material such as plastic, rubber, or silicone, which has a lower rigidity than the outer shell 210. Specifically, the outer shell 210 is made of metal, while the cushioning liner 220 is made of an elastic material. The elastic cushioning liner 220 provides better shock absorption and cushioning, thereby effectively reducing noise from the stopper protrusion 124. The cushioning liner 220 can be fixed to the outer shell 210 by means of a crimping connection, screw connection, or injection molding. The cushioning liner 220 can have a variety of shapes, which are not specifically limited here. By ensuring that the stopper protrusion 124 engages with a mating portion 221 on the cushioning liner 220, rather than directly contacting the outer shell 210, the stopper protrusion can effectively prevent jarring noise from the collision.

[0056] The trimmer head 120 of the present invention is installed on the blade holder 110 so that the blade head 120 can float up and down. The blade head 120 has a limiting protrusion 124 protruding in the first direction. A buffer lining 220 is provided in the shell 210, so that the limiting protrusion 124 and the matching portion 221 of the buffer lining 220 are limited and matched, which effectively and reliably limits the up and down floating range of the blade head 120 compared with the blade holder 110. Compared with the limiting protrusion 124 directly contacting the shell 210, the buffer lining 220 can silence and reduce the noise of the limiting protrusion 124 to avoid the limiting protrusion 124 floating up and down and generating collision noise. When the trimmer head 120 has multiple blade heads 120, compared with the method of setting a buffer sleeve on the limiting protrusion 124 to reduce noise, the utility model does not need to make multiple buffer sleeves and multiple limiting protrusions 124 finely assembled. Multiple limiting protrusions 124 can contact the buffer lining 220 at the same time, thereby reducing manufacturing costs and simplifying installation steps.

[0057] Furthermore, the cutter head 120 and the cutter seat 110 slide vertically together via the guide rod 111 and the guide hole 122. The cross-section of the guide section 123 of the guide hole 122 is wider in the first direction than in the second direction. This reduces the clearance between the guide rod 111 and the guide hole 122 in the second direction, preventing the entire cutter head 120 from swinging significantly in the second direction. Therefore, only the limiting protrusions 124 need be provided at both ends of the cutter head 120 in the first direction, while no limiting protrusions 124 are required on both sides of the cutter head 120 in the second direction. This reduces the number of limiting protrusions 124 on the cutter head 120, simplifies the structure of the cutter head 120, and reduces noise sources. Therefore, the buffer lining 220 only needs to be provided on the inner wall of the limiting protrusion 124 on the mounting bracket 121 of the housing 210, which can reduce the volume of the buffer lining 220 and lower manufacturing costs.

[0058] Furthermore, the mounting frame 121 includes a frame body and two end covers installed at both ends of the frame body in the first direction, and each end cover is protruded with the limiting protrusion; the cutter head 120 also includes a stationary knife 125 and a movable knife 126, the stationary knife 125 is fixedly connected to the frame body, and the movable knife 126 is arranged on the inner side of the stationary knife 125, and can move back and forth relative to the stationary knife 125 along the first direction to achieve cutting; there are two buffer liners 220, and the two buffer liners 220 are respectively fixed to the inner walls of the two ends of the outer shell 210 in the first direction.

[0059] In this embodiment, the movable blade 126 is positioned inside the stationary blade 125, that is, the stationary blade 125 covers the movable blade 126. The specific structures of the stationary blade 125 and the movable blade 126 can be selected and designed based on the type of cutter head 120. For example, when the cutter head 120 is a short-beard cutter head 120, the stationary blade 125 utilizes a curved blade net with multiple meshes, while the movable blade 126 is designed as a blade with a curved strip-shaped cutting edge. When the cutter head 120 is a long-beard cutter head 120, both the stationary blade 125 and the movable blade 126 are designed as blades with shear teeth on both sides. The mounting frame 121 includes a frame body 1211 and end caps 1212, securing the stationary blade 125 to the frame body 1211. The ends of the stationary blade 125 may or may not be connected to the end caps 1212. The stationary blade 125 and the frame body 1211 may be fixedly connected by welding, plugging, or other methods. The frame body 1211 is specifically a static blade frame for mounting the static blade 125. The end cap 1212 prevents the end of the static blade 125 from being exposed. The specific structure of the frame body 1211 can be selected and designed according to the type of the cutter head 120 and is not specifically limited here.

[0060] In practice, the movable blade 126 is connected to the drive shaft 22 of the linear motor. When the linear motor drives the movable blade 126 to reciprocate in a first direction, the entire cutter head 120 inevitably oscillates slightly in the first direction. That is, the ends of the cutter head 120 in the first direction rotate about the output shaft of the linear motor. The cross-section of the guide segment 123 is wider in the first direction than in the second direction. That is, the guide segment 123 is larger in the direction of movement of the movable blade 126 than in other directions. This provides space for slight deflection of the ends of the cutter head 120, preventing interference caused by slight left-right rotation of the entire cutter head 120 as the cutter head 120 floats up and down along the guide rod 111.

[0061] The static blade 125 is provided with an end cap 1212 at each end in the first direction, and the entire blade head 120 is provided with the limiting protrusion 124 at both ends in the first direction. A buffer liner 220 is provided on each of the inner walls of the housing 210 at both ends in the first direction, so that the entire blade head 120 can be limited and cooperated with the limiting protrusion 124 at both ends in the first direction. This ensures that the blade head 120 is evenly limited at both ends in the first direction while fully reducing the floating noise of the blade head 120. In addition, only providing a buffer liner 220 on each of the inner walls of the housing 210 at both ends in the first direction, rather than providing a buffer liner 220 on the entire inner circumference of the housing 210, can effectively reduce the volume of the buffer liner 220, which is conducive to achieving lightweight and miniaturization of the entire trimmer blade head 120.

[0062] Further, if Figure 1 、 Figure 5 and Figure 7 As shown, there are multiple cutter heads 120, and the multiple cutter heads 120 are arranged side by side in the second direction. The end covers 1212 at both ends of each cutter head 120 are protruding with the limiting protrusion 124; the multiple limiting protrusions 124 located at the same end of the first direction are limitedly matched with one of the buffer liners 220.

[0063] In this embodiment, the trimmer head 120 has multiple cutter heads 120, which can increase the trimming area of the trimmer head 120 and thus improve the shearing efficiency. The types of the multiple cutter heads 120 can be the same or different, and can be selected and designed according to actual needs, which is not specifically limited here. Each cutter head 120 is provided with a limiting protrusion 124 on the end cover 1212 at both ends in the first direction. The multiple limiting protrusions 124 of the multiple cutter heads 120 located at the same end of the first direction can simultaneously cooperate with the buffer lining 220 at that end, that is, the multiple limiting protrusions 124 located at the same end share a buffer lining 220. Compared with the method of providing a buffer sleeve on each limiting protrusion 124, the manufacturing cost can be reduced and the installation steps can be simplified.

[0064] Furthermore, if Figure 7 、 Figure 9 and Figure 10 As shown, the mating portion 221 has a first mating surface 222 and a second mating surface 223, and the second mating surface 223 is higher than the first mating surface 222; the multiple cutter heads 120 include an intermediate cutter head 127 and side cutter heads 128 arranged on both sides of the intermediate cutter head 127 in the second direction, and the limiting protrusion 124 of the intermediate cutter head 127 is limitedly matched with the first mating surface 222, and the limiting protrusion 124 of the side cutter head 128 is limitedly matched with the second mating surface 223.

[0065] In this embodiment, typically, the side blade head 128 is designed as a short-beard blade head 120, and the middle blade head 127 is designed as a long-beard blade head 120 or a short-beard blade head 120. The mating portion 221 of the insulating liner is provided with a first mating surface 222 and a second mating surface 223 of different heights. Thus, the limiting protrusions 124 of the middle blade head 127 and the side blade head 128 do not abut against the buffer liner 220 in the same plane, effectively avoiding interference between the limiting protrusions 124 of two adjacent blade heads 120. Furthermore, the second mating surface 223 is made higher than the first mating surface 222. Thus, the distance between the second mating surface 223 and the blade holder 110 is greater than the distance between the first mating surface 222 and the blade holder 110. This provides the limiting protrusions 124 on the side blade head 128 with sufficient vertical floating space 225.

[0066] In one embodiment, please refer to Figure 3 、 Figures 7 to 10 The buffer lining 220 also includes a buffer portion 224. The matching portion 221 is provided on the side wall of the buffer portion 224 facing the cutter head 120. The buffer portion 224 forms a floating space 225 below the matching portion 221 for the limiting protrusion 124 to float up and down.

[0067] In this embodiment, the buffer portion 224 is integrally formed with the mating portion 221. By providing the buffer liner 220 with the buffer portion 224, and by forming a floating space 225 below the mating portion 221 for the position-limiting protrusion 124 to float, the buffer liner 220 not only cushions and reduces vibration and noise during the upward movement of the position-limiting protrusion 124, but also provides buffering protection throughout the entire upward and downward movement of the position-limiting protrusion 124. This effectively prevents the position-limiting protrusion 124 from making scraping and harsh noises when floating upward and downward, further reducing the floating noise of the cutter head assembly 100.

[0068] Furthermore, the buffer portion 224 is recessed toward the sidewall surface of the cutter head 120 to enclose the matching portion 221 to form the floating space 225. In this way, the position-limiting protrusion 124 protruding from the end cap 1212 can directly extend into the floating space 225 and float up and down. When the cutter head 120 floats, the position-limiting protrusion 124 can move from the floating space 225 to abut against the matching portion 221, thereby simplifying the structure of the buffer liner 220 and improving the reliability of the matching between the position-limiting protrusion 124 and the buffer liner 220.

[0069] In one embodiment, please refer to Figure 3 、 Figure 4 、 Figure 7 and Figure 10As shown, the inner wall of the outer shell 210 is provided with an embedding groove 211, and the buffer liner 220 is adapted to be embedded in the embedding groove 211. This not only improves the installation convenience and connection stability of the buffer liner 220 and the outer shell 210, but also effectively reduces the thickness of the entire blade housing assembly 200, which is conducive to miniaturization and lightweighting of the entire trimmer blade head 120.

[0070] Further, if Figure 9 and Figure 10 As shown, the side wall of the embedding groove 211 in the first direction is provided with a mounting seat 212; the buffer lining 220 is provided with a matching groove 226 corresponding to the mounting seat 212, the mounting seat 212 is adapted to be embedded in the matching groove 226, and the bottom wall of the mounting seat 212 is exposed from the buffer lining 220 so as to be fixedly connected to the knife seat 110.

[0071] In this embodiment, since the rigidity and hardness of the outer shell 210 are higher than those of the buffer liner 220, a mounting platform is provided on the inner wall of the outer shell 210 to be fixedly connected to the blade holder 110, thereby ensuring the stability and reliability of the connection between the blade holder 110 and the entire cutter head housing assembly 200. In addition, a matching groove 226 is provided on the buffer liner 220 to adapt to the mounting seat 212, thereby increasing the limiting matching area between the buffer liner 220 and the outer shell 210. The matching groove 226 and the mounting seat 212 can limit the relative movement of the buffer liner 220 and the outer shell 210 in the second direction, thereby improving the limiting matching effect of the buffer liner 220 and the outer shell 210.

[0072] For further information, please refer to Figure 2 、 Figure 3 、 Figures 7 to 10 、 Figure 13 The tool holder 110 has a main body 112 and mounting lugs 113 connected to both ends of the main body 112 in the first direction; the tool head 120 is floatingly mounted on the main body 112 along the up and down directions; the bottom wall of the buffer lining 220 is provided with a mounting groove 227, and the bottom wall of the mounting seat 212 is exposed in the mounting groove 227; the mounting lug 113 is embedded in the mounting groove 227 and is fixedly connected to the mounting seat 212.

[0073] In this embodiment, the mounting lugs 113 fit snugly within the mounting grooves 227 of the buffer liner 220, ensuring that they do not protrude from the buffer liner 220. This ensures the smoothness of the bottom surface of the entire trimmer head 120. Once the mounting lugs 113 are inserted into the mounting grooves 227 of the buffer liner 220 and securely connected to the mounting base 212, the entire buffer liner 220 is vertically sandwiched between the mounting lugs 113 of the blade holder 110 and the outer shell 210, securing the buffer liner 220 to the outer shell 210 in a fixed position. This fully utilizes the blade holder 110 to position the buffer liner 220, eliminating the need for an additional connecting structure to connect the buffer liner 220 to the outer shell 210. This reduces the number of components and simplifies the installation process.

[0074] Specifically, a mounting hole 213 is provided on the mounting seat 212, a fixing hole 114 is provided on the mounting lug 113, and the trimmer head 120 also includes a fastener 300, which passes through the fixing hole 114 and is connected to the mounting hole 213 to fix the blade seat 110 and the blade head shell assembly 200.

[0075] The fastener 300 can be a screw, and the mounting hole 213 is a threaded hole. During installation, the buffer liner 220 is first inserted into the embedding groove 211 of the housing 210. Then, the mounting lug 113 of the blade holder 110 is inserted into the mounting groove 227 of the buffer liner 220. Finally, the fastener 300 is passed through the fixing hole 114 of the mounting lug 113 and threadedly connected to the mounting hole 213 to securely connect the blade holder 110, the buffer liner 220, and the housing 210. Connecting the mounting lug 113 and the mounting base 212 via the fastener 300 is simple, reliable, and easy to operate.

[0076] In one embodiment, if Figures 7 to 10 As shown, the buffer liner 220 further includes extensions 228 connected to both side edges of the buffer portion 224 in the second direction. The mating portion 221 and the floating space 225 extend in the second direction to the outer edges of the extensions 228. The provision of the extensions 228 widens the mating portion 221 and the floating space 225, further enhancing the cushioning and shock-absorbing effect of the buffer liner 220 on the cutter head 120.

[0077] Furthermore, the extension portion 228 is provided on the side of the buffer portion 224 near the cutter head 120, and the inner wall of the housing 210 is provided with a fixing groove 214 for the extension portion 228 to fit in. This improves the stability of the fit between the extension portion 228 and the housing 210, thereby ensuring the reliability of the connection between the entire buffer liner 220 and the housing 210.

[0078] Further, please refer to Figure 2 、 Figure 7 、 Figure 9 、 Figure 10 and Figure 13 The buffer lining 220 also includes fixing lugs 229 provided on both sides of the matching groove 226 in the second direction; the fixing lugs 229 and the matching portion 221 are respectively provided at the upper and lower ends of the buffer portion 224; the bottom wall of the shell 210 is provided with a limiting groove 215 adapted to the fixing lug 229; the fixing lug 229 and the extension portion 228 are spaced apart and clamped by the shell 210.

[0079] In this embodiment, the provision of the limiting lugs limits the displacement of the buffer liner 220 relative to the shell 210 in the first and second directions, eliminating the need for an additional connecting structure to connect the buffer liner 220 and the shell 210. Furthermore, the fixing lugs 229 are spaced apart from the extension 228, forming a dovetail groove therebetween. The shell 210 is provided with an embedded flange corresponding to the dovetail groove, so that the fixing lugs 229 and the extension 228 sandwich the shell 210. This further ensures the reliability of the positional limitation between the buffer liner 220 and the shell 210 in the first and second directions.

[0080] In one embodiment, if Figure 3 and Figure 4 As shown, the end cover 12122 is provided with a guide hole 122, and the width of the cross section of the guide section 123 in the first direction is gradually increased from bottom to top; or,

[0081] The blade holder 110 is provided with a guide hole 122 , and the width of the cross section of the guide section 123 in the first direction is gradually reduced from bottom to top.

[0082] It is understood that, as the cutter head 120 as a whole deflects up and down about the linear motor's drive shaft 22, the rotational space required by the guide rod 111 at its free end gradually increases. When the guide hole 122 is provided in the end cap 12122, the width of the cross-section of the guide segment 123 in the first direction is gradually increased from bottom to top; when the guide hole 122 is provided in the cutter seat 110, the width of the cross-section of the guide segment 123 in the first direction is gradually decreased from bottom to top. Thus, when the cutter head 120 is slightly rotated to its extreme position, the wall surface of the guide segment 123 in the first direction can be adapted to fit the guide rod 111. Simultaneously, the gap between the guide segment 123 and the guide rod 111 at the connection end near the guide rod 11 is reduced. Compared to a method in which the cross-section of the entire guide segment 123 in the first direction is uniformly large, this method reduces collision noise, effectively ensures the guiding fit between the guide rod 111 and the guide hole 122, and improves guiding accuracy.

[0083] The utility model also proposes an electric trimmer, please refer to Figures 11 to 13 The electric trimmer includes a main unit 20 and a trimmer head 120. The specific structure of the trimmer head 120 is similar to that of the above-mentioned embodiments. The main unit 20 includes a housing 21 and a drive shaft 22. The head housing assembly 200 of the trimmer head 120 is connected to the housing 21, and the drive shaft 22 is connected to the head assembly 100 of the trimmer head 120. Since the electric trimmer adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be detailed here.

[0084] The electric trimmer can specifically be a razor. The shape of the housing 21 can be selected and designed according to actual needs and is not specifically limited here. The cutter head housing assembly 200 and the housing 21 can be detachably connected or non-detachably connected. There can be many specific connection methods between the two, which are not limited here. The electric trimmer also includes a linear motor, which has a drive shaft 22. The drive shaft 22 is connected to the movable blade 126 of the cutter head assembly 100 to drive the movable blade 126 to reciprocate relative to the stationary blade 125 along a first direction. The number of linear motors can be selected and designed according to the number of cutter heads 120. For example, the linear motor can be set to one or two. The structure of the linear motor can refer to existing designs and will not be described in detail here.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A trimmer head, characterized in that: include: A cutter head assembly, the cutter head assembly comprising a cutter seat and at least one cutter head floatingly mounted on the cutter seat in an up-down direction, the cutter head comprising a mounting frame; one of the mounting frame and the cutter seat is provided with a guide rod extending in the up-down direction, and the other is provided with a guide hole for sliding engagement with the guide rod; the guide hole has a guide section, the cross-section of the guide section having a width in a first direction greater than a width in a second direction; the mounting frame has a limiting protrusion protruding in the first direction; the up-down direction, the first direction, and the second direction are perpendicular to each other; as well as The cutter head shell assembly includes an outer shell and a buffer lining fixed to the inner wall of the outer shell. The buffer lining has a matching portion. The limiting protrusion can float up and down below the matching portion, and when the cutter head is in a floating state, the top surface of the limiting protrusion abuts against the matching portion.

2. The trimmer head according to claim 1, wherein: The mounting frame includes a frame body and two end covers installed at both ends of the frame body in the first direction, and each end cover is protruded with the limiting protrusion; the cutter head also includes a stationary knife and a movable knife, the stationary knife is fixedly connected to the frame body, the movable knife is arranged on the inner side of the stationary knife, and can move back and forth relative to the stationary knife along the first direction to achieve cutting; there are two buffer liners, and the two buffer liners are respectively fixed to the inner walls of the two ends of the outer shell in the first direction.

3. The trimmer head according to claim 2, wherein: There are multiple cutter heads, and the multiple cutter heads are arranged side by side in the second direction. The end caps at both ends of each cutter head are protruded with the limiting protrusions; the multiple limiting protrusions located at the same end of the first direction are limitedly matched with one of the buffer liners.

4. The trimmer head according to claim 3, wherein: The mating portion has a first mating surface and a second mating surface, and the second mating surface is higher than the first mating surface; the multiple cutter heads include an intermediate cutter head and side cutter heads arranged on both sides of the intermediate cutter head in the second direction, and the limiting protrusion of the intermediate cutter head is limitedly mated with the first mating surface, and the limiting protrusion of the side cutter head is limitedly mated with the second mating surface.

5. The trimmer head according to any one of claims 1 to 4, characterized in that The buffer lining further includes a buffer portion, the matching portion is provided on a side wall surface of the buffer portion facing the cutter head, and the buffer portion forms a floating space below the matching portion for the limiting protrusion to float up and down.

6. The trimmer head according to claim 5, wherein: The buffer portion is concave toward the side wall surface of the cutter head to enclose the matching portion to form the floating space.

7. The trimmer head according to claim 5, wherein: The inner wall of the shell is provided with an embedding groove, and the buffer lining is adapted to be embedded in the embedding groove.

8. The trimmer head according to claim 7, wherein: The side wall of the embedding groove in the first direction is provided with a mounting seat; the buffer lining is provided with a matching groove corresponding to the mounting seat, the mounting seat is adapted to be embedded in the matching groove, and the bottom wall of the mounting seat is exposed from the buffer lining to be fixedly connected to the knife seat.

9. The trimmer head according to claim 8, wherein: The blade seat has a main body and mounting lugs connected to both ends of the main body in a first direction; the blade head is floatingly mounted on the main body along the up and down directions; a mounting groove is provided on the bottom wall of the buffer lining, and the bottom wall of the mounting seat is exposed in the mounting groove; the mounting lug is embedded in the mounting groove and fixedly connected to the mounting seat.

10. The trimmer head according to claim 9, wherein: The mounting seat is provided with a mounting hole, the mounting lug is provided with a fixing hole, and the trimmer head further comprises a fastener, which passes through the fixing hole and is connected with the mounting hole to fix the blade seat and the blade head shell assembly.

11. The trimmer head according to claim 5, wherein: The buffer liner further includes an extension portion connected to both side edges of the buffer portion in the second direction, and the matching portion and the floating space extend to the outer side edge of the extension portion in the second direction.

12. The trimmer head according to claim 11, wherein The extension portion is arranged at a side end of the buffer portion close to the cutter head, and an inner wall surface of the shell is provided with a fixing groove for the extension portion to be adapted and installed.

13. The trimmer head according to claim 12, wherein: The buffer lining also includes fixing lugs arranged on both sides of the buffer portion in the second direction; the fixing lugs and the matching portion are respectively arranged at the upper and lower ends of the buffer portion; the bottom wall of the outer shell is provided with a limiting groove adapted to the fixing lug; the fixing lug is spaced apart from the extension portion and is clamped by the outer shell.

14. The trimmer head according to claim 1, wherein: The outer shell is made of metal, and the buffer lining is made of elastic material.

15. The trimmer head according to claim 2, wherein: The end cover is provided with a guide hole, and the width of the cross section of the guide section in the first direction is gradually increased from bottom to top; or, The knife seat is provided with a guide hole, and the width of the cross section of the guide section in the first direction is gradually reduced from bottom to top.

16. An electric trimmer, characterized in that: The present invention comprises a main body and a trimmer head according to any one of claims 1 to 15, wherein the main body comprises a housing and a drive shaft, the head housing group of the trimmer head is connected to the housing, and the drive shaft is connected to the head assembly of the trimmer head.

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