Glue-free integrally-formed cosmetic brush

Abstract

The utility model discloses a glue-free integrally-formed cosmetic brush. The glue-free integrally-formed cosmetic brush comprises a brush rod and a brush head assembly, the brush head assembly and the brush rod are integrally connected through injection molding. The brush head assembly comprises a bristle cluster, a sleeve and a plunger; the root of each bristle cluster is provided with at least two peripheral protrusions which are arranged at intervals in the circumferential direction, and a first groove is formed between the at least two peripheral protrusions; one end of the sleeve is connected with the brush rod; the inner wall of the other end of the sleeve is provided with an annular boss, the end face, facing the brush rod, of the annular boss is provided with at least two bearing bosses arranged at intervals in the circumferential direction, a second groove is formed between the at least two bearing bosses, the peripheral protrusion is meshed with the second groove, and the bearing bosses are meshed with the first groove; the plunger is embedded into the sleeve and is in zero-clearance fit with the sleeve, and the peripheral protrusion is clamped between the plunger and the annular boss. The utility model has the advantages of few parts, simple manufacture, few steps, firm assembly, omission of glue bonding, and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of cosmetic equipment technology, and in particular to a glue-free, one-piece molded cosmetic brush. Background Technology

[0002] With increasingly stringent environmental protection requirements, most existing makeup brushes adopt a glue-free process, where the bristles form a skirt at the base and are embedded into the brush handle, as exemplified by the prior art with patent publication number CN113271810A. Figure 7 As shown, this assembly method makes it easy for the bristles to detach from the brush handle, affecting its service life. To increase the reliability of the connection between the bristles and the brush handle, existing technologies connect the bristles to the brush handle using connectors. For example, in the prior art of patent publication number CN219069671U, during the assembly of the glue-free makeup brush, the skirt of the bristle assembly is inserted between multiple spring pieces of the sleeve. During this process, the spring pieces move away from each other, widening the mounting groove. After the skirt enters the mounting groove, the spring pieces regain their elastic deformation, narrowing the mounting groove. Then, the connecting structure is used to fix the sleeve to the handle and drive the spring pieces to move closer together to maintain the bristle assembly. For example, the prior art of patent publication number CN116649710A includes bristles and a mounting component. The combination buckle includes a first clip and a second clip. The first clip and the second clip are enclosed together, and the upper ends of the first clip and the second clip are provided with a first groove. The two first grooves enclose a mounting groove, and the mounting component is held in the mounting groove. The brush head can be installed on the combination buckle without the use of glue. The existing makeup brushes have many parts, are complex and expensive to manufacture, and have drawbacks such as requiring many steps in their production and not being able to assemble securely. Utility Model Content

[0003] Therefore, it is necessary to provide a makeup brush that solves the above-mentioned technical problems.

[0004] A glue-free, one-piece molded makeup brush, comprising:

[0005] Brush handle; brush head assembly, wherein the brush head assembly and brush handle are integrally injection molded and connected;

[0006] The brush head assembly includes a bristle tuft, a sleeve, and a plunger; the root of the bristle tuft has at least two peripheral protrusions arranged circumferentially, and a first groove is provided between the at least two peripheral protrusions; one end of the sleeve is connected to the brush rod; the inner wall of the other end of the sleeve is provided with an annular boss.

[0007] The annular boss has at least two load-bearing bosses arranged circumferentially on the end face facing the brush rod. A second groove is provided between the at least two load-bearing bosses. The peripheral protrusion engages with the second groove, and the load-bearing bosses engage with the first groove.

[0008] The plunger is embedded in the sleeve, and the plunger and the sleeve are fitted without clearance. The peripheral protrusion is engaged between the plunger and the annular protrusion.

[0009] Optionally, the height of the load-bearing bosses along the axial direction of the sleeve is equal.

[0010] Optionally, the circumferential length of the second groove is greater than the circumferential length of the load-bearing boss, and the circumferential length of the peripheral protrusion is greater than the circumferential length of the first groove.

[0011] Optionally, the number of the second groove, the load-bearing boss, the peripheral protrusion, and the first groove are each four.

[0012] Optionally, the plunger has a buffer cone at one end facing the brush rod, the outer diameter of the bottom of the buffer cone is smaller than the diameter of the plunger, the buffer cone and the inner wall of the sleeve form a buffer cavity, and one end of the brush rod extends into the buffer cavity.

[0013] Optionally, the buffer cone extends out of the sleeve.

[0014] Optionally, the top of the buffer cone is arched.

[0015] Optionally, one end of the brush rod has a socket that is fitted into the buffer cavity.

[0016] Optionally, the plunger and the sleeve are interference fit.

[0017] Optionally, the height of the load-bearing boss is equal to or slightly less than the height of the peripheral protrusion.

[0018] Beneficial effects:

[0019] This application provides a glue-free one-piece molded makeup brush. The brush head assembly is assembled by snapping the peripheral protrusions between the plunger and the annular boss. The brush head assembly is then injection molded to connect the brush handle to form the makeup brush. It has fewer parts, is simple to manufacture, has fewer steps, and is firmly assembled. It eliminates the need for glue bonding and is more environmentally friendly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a makeup brush in one embodiment;

[0022] Figure 2 This is an exploded view of a makeup brush in one embodiment;

[0023] Figure 3 This is an exploded view of the brush head assembly in one embodiment;

[0024] Figure 4 This is a schematic diagram of the brush head assembly in one embodiment;

[0025] Figure 5 as one Figure 4 Cross-sectional view of the brush head assembly along direction AA;

[0026] Figure 6 This is a schematic diagram of the sleeve structure in one embodiment;

[0027] Figure 7 as one Figure 6 Cross-sectional view of the middle sleeve along the BB direction.

[0028] Figure 8 This is a top view of the sleeve in one embodiment;

[0029] Figure 9 This is a top view of the bristle clusters assembled on the sleeve in one embodiment;

[0030] Figure 10 This is a schematic diagram of the brush rod structure in one embodiment;

[0031] Figure 11 This is a front view of the fixture in one embodiment;

[0032] Figure 12 for Figure 10 Cross-sectional view of the clamp in the CC direction;

[0033] Figure 13 This is a schematic diagram of the fixture in one embodiment;

[0034] Figure 14 This is a schematic diagram of the structure of the thin sheet in one embodiment.

[0035] Among them, 100, makeup brush; 1, brush handle; 2, brush head assembly; 3, bristle tuft; 31, root; 4, peripheral protrusion; 41, first groove; 5, sleeve; 51, annular boss; 52, load-bearing boss; 53, second groove; 54, buffer cavity; 6, plunger; 7, buffer cone; 71, top; 72, bottom of buffer cone; 8, buffer boss; 9, receiving cavity; 10, insertion port; 11, clamp; 12, retaining ring; 13, cylindrical cavity; 14, thin sheet.

[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0040] refer to Figures 1 to 10 This illustration shows an embodiment of a glue-free, one-piece molded makeup brush 100, which includes a brush handle 1 and a brush head assembly 2. The brush head assembly 2 is integrally molded with the brush handle 1. The brush head assembly 2 includes a bristle tuft 3, a sleeve 5, and a plunger 6. The root 31 of the bristle tuft 3 has at least two peripheral protrusions 4 arranged circumferentially at intervals, and a first groove 41 is provided between the at least two peripheral protrusions 4. One end of the sleeve 5 is connected to the brush handle 1. The inner wall of the other end of the sleeve 5 is provided with an annular boss 51. The end face of the annular boss 51 facing the brush handle 1 has at least two load-bearing bosses 52 arranged circumferentially at intervals, and a second groove 53 is provided between the at least two load-bearing bosses 52. The peripheral protrusions 4 engage with the second groove 53, and the load-bearing bosses 52 engage with the first groove 41. The plunger 6 is embedded in the sleeve 5, and the plunger 6 and the sleeve 5 are fitted without gaps. The peripheral protrusions 4 are engaged between the plunger 6 and the annular boss 51.

[0041] In this embodiment, the peripheral protrusion 4 engages with the second groove 53, and the load-bearing boss 52 engages with the first groove 41. The peripheral protrusion 4 is snapped between one end of the plunger 6 and the annular boss 51 to assemble the brush head assembly 2. The brush head assembly 2 and the brush handle 1 are then injection molded together to form a cosmetic brush. The process involves fewer parts, simpler manufacturing, fewer steps, and more reliable assembly.

[0042] In this embodiment, the brush rod 1, bristle tuft 3, sleeve 5, and plunger 6 are made of recyclable and / or biodegradable materials, such as PLA and / or PET and / or PBT. In this embodiment, the bristle tuft 3 is made of different materials than the brush rod 1, sleeve 5, and plunger 6; for example, the bristle tuft 3 is made of PBT, while the brush rod 1, sleeve 5, and plunger 6 are made of PET. In another embodiment, the brush rod 1, bristle tuft 3, sleeve 5, and plunger 6 are made of the same material.

[0043] During the injection molding process, the molten material temperature of the brush rod 1 reaches above 200 degrees Celsius, which will cause the brush bristle cluster 3 to be partially or completely deformed. This invention addresses this by having the peripheral protrusion 4 engaged between the plunger 6 and the annular boss 51. The plunger 6 prevents the molten material of the brush rod from directly acting on the brush bristle cluster 3 during injection molding, thus preventing the brush bristle cluster 3 from melting and deforming. At the same time, during the injection molding process, the machine pressure is set above 30 Bar, and the injection pressure is around 100 MPa. The strong pressure during injection acts on the plunger 6 and may break or partially break the peripheral protrusion 4. This invention addresses this by setting a load-bearing boss 52 to support the plunger 6, preventing the plunger 6 from being impacted by the injection pressure during injection molding and breaking or partially breaking the peripheral protrusion 4, thus preventing the brush bristle cluster 3 from detaching or easily detaching from the sleeve 5.

[0044] In this embodiment, the height of the load-bearing boss 52 along the axial direction of the sleeve 5 is equal. The circumferential length of the second groove 53 is greater than the circumferential length of the load-bearing boss 52, and the circumferential length of the peripheral protrusion 4 is greater than the circumferential length of the first groove 41. Thus, the bristle cluster 3 is firmly engaged with the sleeve 5, preventing the peripheral protrusion 4 from easily deforming and detaching from the sleeve 5 during use. In this embodiment, the height of the load-bearing boss 52 is equal to or slightly less than the height of the peripheral protrusion 4, thereby the plunger 6 and the annular boss 51 exert a certain clamping force on the peripheral protrusion 4, further preventing the peripheral protrusion 4 from easily deforming and detaching from the sleeve 5 during use.

[0045] Specifically, the number of the second groove 53, the load-bearing boss 52, the peripheral protrusion 4, and the first groove 41 are 3 or 4 respectively. In this embodiment, the 3 or 4 peripheral protrusions 4 are evenly spaced along the circumference of the root 31 of the bristle tuft 3; the 3 or 4 load-bearing bosses 52 are evenly spaced along the circumference of the end face of the annular boss 51 toward the brush rod 1. In this way, it is avoided that the peripheral protrusions 4 are too numerous and too small and not solid, which would easily deform during use and cause the bristle tuft 3 to detach from the sleeve 5; it is also avoided that the number of load-bearing bosses 52 is too small or too small, which would result in insufficient support to withstand the impact of the injection pressure on the plunger 6 during injection molding, and thus break or partially break the peripheral protrusions 4, thereby causing the bristle tuft 3 to detach or easily detach from the sleeve 5.

[0046] In one embodiment, the plunger 6 has a buffer cone 7 at the end facing the brush rod 1. The outer diameter of the bottom 72 of the buffer cone is smaller than the diameter of the plunger 6, and the diameter of the plunger 6 is equal to the diameter of the inner wall of the sleeve 5 to form a clearance-free fit. It should be noted that the diameter of the plunger 6 can be slightly larger than the diameter of the inner wall of the sleeve 5 to form an interference fit. The plunger 6 connects to the bottom 71 of the buffer cone to form a buffer boss 8. The buffer cone 7 and the inner wall of the sleeve 5 form a buffer cavity 54. During injection molding, the material is incorporated into the buffer cavity 54, so that one end of the brush rod 1 extends into the buffer cavity 54. One end of the brush rod 1 forms an insertion port 10 that adapts to the buffer cavity 54, making the connection between the brush rod 1 and the sleeve 5 more secure.

[0047] In this embodiment, the buffer cone 7 extends out of the sleeve 5, and correspondingly, a receiving cavity 9 is provided at one end of the brush handle, into which the buffer cone 7 extends. In another embodiment, the buffer cone 7 does not extend out of the sleeve 5, and correspondingly, the length of the sleeve 5 is increased.

[0048] Specifically, the top 71 of the buffer cone 7 is arched. In this embodiment, the top 71 of the buffer cone 7 is rounded like an arch, making the buffer cone 7 as a whole resemble a parabolic body of revolution. This further enhances the buffering capacity of the buffer cone 7 during the injection molding process.

[0049] This utility model also provides a method for manufacturing any of the above-mentioned glue-free one-piece molded makeup brushes, including:

[0050] Step 1: Insert the bristle tuft 3 into the sleeve 5 from the end away from the annular boss 51; In this embodiment, the step of making the bristle tuft includes melting the bristles at one end of the bristle tuft, referred to as the root, to form a plate with a profile wider than the root of the bristle tuft, thereby forming a peripheral protrusion 4.

[0051] In this embodiment, step 1 specifically includes: wrapping the bristle tuft 3 with a pointed thin sheet 14, so that the root of the bristle tuft 3 faces away from the pointed tip of the thin sheet 14; aligning the pointed tip of the thin sheet 14 with the end of the sleeve 5 away from the annular boss 51, so that the pointed tip of the thin sheet 14 enters the sleeve 5 from the end away from the annular boss 51, causing the bristle tuft 3 to extend out from the annular boss 51; removing the thin sheet 14, adjusting the bristle tuft 3 so that the peripheral protrusion 4 engages with the second groove 53, and the load-bearing boss 52 engages with the first groove 41. By wrapping the bristle tuft 3 with the pointed thin sheet 14, the bristles of the bristle tuft 3 are tightly wrapped and not blocked by the sleeve 5, so that the bristle tuft 3 can enter the sleeve 5 from the end away from the annular boss 51, and the peripheral protrusion 4 is engaged with the annular boss 51, without forcibly inserting the peripheral protrusion 4 from the end of the sleeve 5 near the annular boss 51, thereby damaging the peripheral protrusion 4.

[0052] Step 2: Insert the plunger 6 into the sleeve 5, and the plunger 6 will snap the bristle cluster 3 into the sleeve 5 to form the brush head assembly 2;

[0053] Step 3: Place the brush head assembly 2 into the first mold.

[0054] Before performing step 3, the process includes: placing the brush head assembly 2 into the clamp 11, and placing the clamp 11 into the first mold; as follows. Figure 11-13 As shown, the clamp 11 has a cylindrical cavity 13 for accommodating the brush head assembly 2, and a retaining ring 12 for supporting the brush head assembly 2 is provided in the cylindrical cavity 13.

[0055] The brush head assembly 2 is placed into the clamp 11, specifically including: wrapping the bristle tuft 3 with a thin sheet 14, so that the back of the bristle tuft 3 faces the tip of the thin sheet 14; aligning the tip of the thin sheet 14 with one end of the cylindrical cavity 13, so that the tip of the thin sheet 14 enters the clamp 11, causing the bristles to extend from one side of the retaining ring 12 to the other side, so that the end face of the sleeve 5 abuts against the retaining ring 12, the bristle tuft 3 is located in the cylindrical cavity 13, and the buffer cone 7 faces the second mold. In this embodiment, as... Figure 14 As shown, the sheet 14 has a structure with one end larger than the other, and the tip of the sheet 14 refers to the relatively smaller end; in this embodiment, the sheet 14 is a plastic sheet 14.

[0056] Step 4: Close the first mold and the second mold, and injection mold the brush rod 1. The brush head assembly 2 and the brush rod 1 are injection molded as a single piece. In this embodiment, the first mold is the male mold and the second mold is the female mold. The second mold has a cavity for the brush rod 1.

[0057] Step 5: Demold the first mold and the second mold to obtain a glue-free, one-piece molded makeup brush.

[0058] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A glue-free, one-piece molded makeup brush, comprising: brush handle; Brush head assembly, The brush head assembly and the brush handle are integrally injection molded and connected. The brush head assembly includes a bristle tuft, a sleeve, and a plunger; the root of the bristle tuft has at least two peripheral protrusions arranged circumferentially, and a first groove is provided between the at least two peripheral protrusions; one end of the sleeve is connected to the brush rod; the inner wall of the other end of the sleeve is provided with an annular boss. The annular boss has at least two load-bearing bosses arranged circumferentially on the end face facing the brush rod. A second groove is provided between the at least two load-bearing bosses. The peripheral protrusion engages with the second groove, and the load-bearing boss engages with the first groove. The plunger is embedded in the sleeve, and the plunger and the sleeve are fitted without clearance. The peripheral protrusion is engaged between the plunger and the annular protrusion.

2. The glue-free, one-piece molded makeup brush according to claim 1, characterized in that, The height of the load-bearing boss along the axial direction of the sleeve is equal.

3. The glue-free, one-piece molded makeup brush according to claim 2, characterized in that, The circumferential length of the second groove is greater than the circumferential length of the load-bearing boss, and the circumferential length of the peripheral protrusion is greater than the circumferential length of the first groove.

4. The glue-free, one-piece molded makeup brush according to claim 1, characterized in that, The number of the second groove, the load-bearing boss, the peripheral protrusion, and the first groove are all four.

5. The glue-free, one-piece molded makeup brush according to claim 1, characterized in that, The plunger has a buffer cone at one end facing the brush rod. The outer diameter of the bottom of the buffer cone is smaller than the diameter of the plunger. The buffer cone and the inner wall of the sleeve form a buffer cavity, and one end of the brush rod extends into the buffer cavity.

6. The glue-free, one-piece molded makeup brush according to claim 5, characterized in that, The buffer cone extends out of the sleeve.

7. The glue-free, one-piece molded makeup brush according to claim 5, characterized in that, The top of the buffer cone is arched.

8. The glue-free, one-piece molded makeup brush according to claim 5, characterized in that, One end of the brush rod has a socket, which is connected to the buffer cavity.

9. The glue-free, one-piece molded makeup brush according to claim 1, characterized in that, The plunger and the sleeve are interference fit.

10. The glue-free, one-piece molded makeup brush according to claim 1, characterized in that, The height of the load-bearing boss is equal to or slightly less than the height of the surrounding protrusions.

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