Switchable refill retractable eyebrow pencil

Abstract

The utility model relates to a kind of switchable refill type telescopic eyebrow pencil, and the eyebrow pencil includes refill assembly, refill assembly includes core support, core rod, corrugated rack bar, and the peripheral surface annular array of core support is equipped with core rod sliding slot, and the core rod sliding slot is uniformly provided with the core rod sliding axially, each core rod one end is equipped with refill jack, and each core rod other end is formed with the limiting head with annular recess, and the limiting head is equipped with the self-locking spring leaf of radially outer convex, the center of the annular array of core support is equipped with center shaft hole and is inserted with corrugated rack bar, the whole length of center shaft hole is communicated with each core rod sliding slot and forms guiding sliding hole radially, guiding sliding hole forms axial sliding guide to the self-locking spring leaf when the axial sliding of core rod, and the end of self-locking spring leaf and the tooth portion of corrugated rack bar form elastic locking cooperation.The above structure, each core rod sliding self-locking is more reliable, stable, and service life is longer, when self-locking performance is insufficient, it can be replaced by replacing corrugated rack bar or core rod, it is more convenient, and replacement cost is reduced.

Description

Technical Field

[0001] This utility model relates to cosmetic products, specifically a retractable eyebrow pencil with interchangeable lead tips. Background Technology

[0002] An eyebrow pencil is a pencil-shaped makeup tool used for drawing eyebrows. Existing eyebrow pencils are typically single-core structures, meaning they contain only a single lead, which extends using a sliding button or push-twist mechanism. For example, Chinese patent publication CN222303322U, published on January 7, 2025, entitled "A Telescopic Eyebrow Pencil," discloses a locking mechanism that uses a locking component and a stop strip to achieve the extension and retraction of the lead. However, its structure is clearly a single-core structure. If applying makeup, multiple pencils of different colors are needed, making it relatively inconvenient to carry and use. Furthermore, once the stop strip structure of the aforementioned eyebrow pencil wears down significantly, the entire pencil tube needs to be replaced, which is obviously costly. Another example is the Chinese patent document CN208909210U, authorized on May 31, 2019, entitled "A Novel Three-Color Eyeliner Pen." This patent discloses a structure similar to existing three-color ballpoint pens, featuring three sliding springs corresponding to the three colors of the lead. When needed, pressing one of the sliding springs pushes out the corresponding lead sleeve, and rotating the sleeve allows the lead to be used via a spiral pusher. While this structure achieves multi-color switching, it is relatively complex, requiring three sets of sliding springs, resulting in high cost and inconvenient assembly and use. Therefore, improvements to existing multi-lead eyebrow pencil structures are needed. Summary of the Invention

[0003] To overcome the aforementioned shortcomings, the purpose of this utility model is to provide a retractable eyebrow pencil with interchangeable refills, thereby solving the technical problems of existing similar eyebrow pencils, such as complex structure, high cost of use and replacement, inconvenient assembly and use, and especially the inconvenience of switching between multiple refills. This objective is achieved through the following technical solution.

[0004] A retractable eyebrow pencil with switchable lead includes a lead assembly. The key structural feature of the lead assembly is that it comprises a rotating lead support, a lead rod, and a corrugated toothed rod. The rotating lead support has a ring-shaped array of axially oriented lead rod grooves on its circumferential surface. Each lead rod groove contains an axially sliding lead rod. One end of each lead rod has a lead insertion hole, and the other end of each lead rod forms a limiting head with an annular notch. The limiting head has a radially protruding self-locking spring. A central shaft hole is located at the center of the ring-shaped array of the rotating lead support. The corrugated toothed rod is inserted and fixedly mounted in the central shaft hole. The entire radial length of the central shaft hole communicates with each lead rod groove to form a guide hole. The guide hole provides axial sliding guidance for the self-locking spring when the lead rod slides axially. The end of the self-locking spring and the teeth of the corrugated toothed rod form an elastic locking engagement. When the lead rod overcomes the elastic locking force, it slides axially. When the lead rod slides to its final position, it self-locks due to the elastic locking force. With the above structure, each core rod is equipped with an independent self-locking spring, and they all share the same corrugated toothed rod. Each core rod corresponds to a different side of the corrugated toothed rod, achieving independent sliding self-locking for each core rod. The structure is relatively reliable and can effectively extend the service life of the self-locking structure. In addition, if the corrugated toothed rod and core rod are damaged, they can be easily replaced independently, resulting in low replacement costs.

[0005] The retractable eyebrow pencil with switchable lead includes a pencil case, which includes a pencil tip, a pencil body, and a rotating cap. The pencil tip is fixed to the bottom of the pencil body and has a lead outlet hole. The rotating lead support is axially limited to rotate within the pencil body. A C-shaped retaining ring is provided at the top of the pencil body to prevent rotation. The top of the rotating lead support has a protrusion that connects to the plug of the rotating cap, and the retaining ring is movably fitted onto the outer diameter of the plug. When the lead rod inside the pencil body is not placed at the opening of the retaining ring, the lead rod passes through the annular notch at the retaining head and annularly engages with the retaining ring. The inner edge fits to form an axial limit; the outer side of the pen body has a sliding hole along its length, and a sliding button that slides into the sliding hole. One end of the sliding button, extending into the inner hole of the pen body, has an overlapping portion. When the core rod rotates with the core rod support, it passes through the opening of the limiting ring, and the annular notch at the core rod limiting head located at the opening disengages from the limiting ring and engages with the overlapping portion of the sliding button. After the overlapping engagement, when the core rod slides from the top to the bottom of the sliding hole with the sliding button, the core rod pushes the core at the core insertion hole to extend out through the core exit hole of the pen tip. This structure is a specific implementation scheme for an eyebrow pencil. Using a single sliding button in conjunction with the rotation of the core rod support, it allows for quick switching and retractable use of different colored cores, which is quite convenient.

[0006] The rotating core support includes a core rod support, a positioning ring, and a refill holder. The core rod support has a core rod groove, a central shaft hole, and a guide sliding hole. The bottom of the core rod support has a positioning protrusion and a core rod extension hole corresponding to the core rod groove. The positioning ring and the refill holder each have a core rod hole aligned with and communicating with the core rod extension hole, and a positioning post hole that mates with the positioning protrusion. The core rod support, positioning ring, and refill holder are axially connected through the positioning post hole and the positioning protrusion to form the rotating core support. The outer diameter of the positioning ring is larger than the outer diameters of the core rod support and the refill holder, meaning the rotating core support rotates flexibly by engaging the outer diameter of the positioning ring with the inner diameter of the pen body. This structure allows the rotating core support to rely primarily on the positioning ring for rotational positioning relative to the pen body, effectively reducing contact wear between the rotating core support and the inner wall of the pen body, reducing damping, and making the rotation of the rotating core support relative to the pen body more effortless, flexible, and convenient. Furthermore, the positioning ring can be easily replaced after wear, eliminating the need to replace the entire rotating core support, thus reducing wear and tear costs.

[0007] The positioning ring is a wear-resistant plate. This structure improves the service life of the positioning ring.

[0008] The limiting retaining ring has an elastic retaining head at one end near the opening. The protruding plug on the top of the rotating core bracket has a retaining groove that forms a self-locking position with the elastic retaining head. When the core is in position and self-locking, the annular notch at the limiting head of one of the core rods inside the rotating core bracket engages with the overlapping part at the inner end of the sliding button. This structure provides a tactile indication when the core rod is switched to the correct position, facilitating switching and use.

[0009] The rotating cap has a limiting flange on its bottom outer diameter. After being inserted into the bottom of the pen body, the rotating cap slides axially to the top of the pen body and is limited by the limiting flange at the constricted opening at the top of the pen body. The limiting ring has a positioning part on its outer diameter. The limiting flange of the rotating cap limits the top surface of the limiting ring, and the inner diameter of the pen body has a limiting groove that cooperates with the positioning part to limit the rotation of the limiting ring. The top of the rotating core bracket is axially limited by the rotating cap, and the bottom of the rotating core bracket is axially limited by the inner end of the pen tip. This structure is a limiting installation implementation structure for the rotating cap, limiting ring, and rotating core bracket. The overall structure is relatively compact and reliable. The rotating cap is not easy to fall off or be lost, and the rotating cap and the top of the pen body have a good dustproof effect.

[0010] The bottom insertion limit of the corrugated toothed rod is located inside the bottom insertion hole of the central shaft hole of the rotating core bracket, and the top insertion limit of the corrugated toothed rod is located inside the rotating cap. This structure is a specific limiting structure for the corrugated toothed rod, which is convenient and reliable for disassembly and assembly.

[0011] The inner end of the pen tip is provided with a sleeve that movably engages with the bottom of the rotating core support, and the bottom circumferential surface of the rotating core support is provided with an annular sealing groove. A movable seal is formed between the annular sealing ring and the inner circumferential surface of the pen tip's sleeve. This structure achieves a seal on the pen refill, extending its lifespan.

[0012] One end of the sliding button that extends into the sliding hole is limited to the inner side of the sliding groove by an elastic hook. This structure facilitates quick installation and positioning of the sliding button and the sliding groove.

[0013] The pen tip of the pen casing is sealed to the pen cap. This structure effectively seals the pen tip, extending the lifespan of the pen refill.

[0014] The overall structure of this utility model is relatively compact and reasonable, the installation and switching of the pen tip is relatively convenient, the self-locking structure is relatively reliable, it is easy to replace, the maintenance cost is low, and the overall service life is relatively long. It is suitable for use as a multi-pen tip eyebrow pencil in the field of makeup, or as an improvement on the structure of similar eyebrow pencils. Attached Figure Description

[0015] Figure 1 This is an exploded view of the pen refill assembly of this utility model.

[0016] Figure 2 yes Figure 1 A schematic diagram of the assembled 3D structure.

[0017] Figure 3 This is a schematic diagram of the limiting ring structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the top surface structure of the pen refill assembly of this utility model in conjunction with the limiting retaining ring.

[0019] Figure 5 This is a partial exploded structural diagram of this utility model.

[0020] Figure 6 yes Figure 5 Exploded view of the intermediate core support.

[0021] Figure 7 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 8 This is a three-dimensional structural diagram of the present invention.

[0023] The numbers and names in the diagram are as follows: 1. Rotating core bracket, 101. Plug, 1011. Slot, 102. Core rod slide groove, 103. Guide slide hole, 104. Central shaft hole, 105. Positioning protrusion, 106. Positioning ring, 107. Pen refill holder, 1071. Positioning post hole, 1072. Annular sealing groove, 2. Core rod, 201. Limiting head, 202. Annular notch, 203. Self-locking spring, 3. Corrugated toothed rod, 4. Limiting retaining ring, 401. Positioning part, 402. Elastic retaining head, 5. Pen tip, 501. Pen refill outlet hole, 502. Insert sleeve, 6. Rotating cap, 601. Limiting flange, 7. Slide button, 701. Overlapping part, 702. Elastic hook, 8. Pen body, 801. Slide hole, 9. Pen cap, 10. Pen refill. Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] like Figures 1-8 As shown, the retractable eyebrow pencil with switchable lead includes a pencil case and a lead assembly. The pencil case includes a pencil tip 5, a pencil body 8, and a rotating cap 6. The pencil tip is fixed to the bottom hole of the pencil body by inserting a sleeve 502, and a sealing ring is provided at the insertion point to form a seal. The pencil tip is provided with a lead outlet hole 501. The pen refill assembly includes a rotating support 1, a refill rod 2, and a corrugated toothed rod 3. The rotating support has a ring array of axially arranged refill rod grooves 102 on its circumferential surface. Each refill rod groove contains an axially sliding refill rod. One end of each refill rod has a refill insertion hole for connecting the pen refill 10, and the other end of each refill rod forms a limiting head 201 with an annular notch 202. The limiting head has a radially protruding self-locking spring 203. The center of the ring array of the rotating support has a central shaft hole 104. A corrugated toothed rod is inserted and fixed in the central shaft hole. The entire radial length of the central shaft hole communicates with each refill rod groove to form a guide sliding hole 103. The guide sliding hole provides axial sliding guidance for the self-locking spring when the refill rod slides axially. The end of the self-locking spring and the teeth of the corrugated toothed rod form an elastic locking engagement. When the refill rod overcomes the elastic locking force, it slides axially. When the refill rod slides to the position, it forms a self-locking position through the elastic locking force.

[0026] The pen body 8 has a constricted opening at its top. The bottom outer diameter of the rotating cap 6 has a limiting flange 601. After being inserted from the bottom of the pen body, the rotating cap slides axially to the top of the pen body and is limited by the limiting flange at the constricted opening at the top of the pen body. The top of the pen body has a C-shaped limiting ring 4 to prevent rotation. Specifically, the outer diameter of the limiting ring has a positioning part 401, the limiting flange of the rotating cap limits the top surface of the limiting ring, and the inner diameter of the pen body has a limiting groove that cooperates with the positioning part to limit the rotation of the limiting ring. The rotating core bracket 1 is axially limited within the pen body and can rotate freely. Specifically, the top of the rotating core bracket has a protruding plug 101 for inserting the rotating cap, and the rotating core bracket rotates with the rotating cap. The top of the rotating core bracket is axially limited to the rotating cap, and the bottom of the rotating core bracket is axially limited to the inner end of the pen tip 5. The aforementioned limiting retaining ring is movably fitted onto the outer diameter of the plug of the rotating core bracket. When the core rod 2 inside the pen body is not positioned at the opening of the limiting retaining ring, the core rod is axially limited by engaging with the inner edge of the limiting retaining ring through the annular notch 202 at the limiting head 201. The bottom insertion limit of the aforementioned corrugated toothed rod 3 is located in the bottom insertion hole of the central shaft hole of the rotating core bracket, and the top insertion limit of the corrugated toothed rod is located at the inner end of the rotating cap.

[0027] The outer side of the pen body 8 is provided with a sliding hole 801 along the length of the pen body, and a sliding button 7 that slides in the sliding hole. The end of the sliding button that extends into the inner hole of the pen body is provided with an elastic hook 702 and an overlapping part 701. The elastic hook forms a hook-stop engagement with the two sides of the sliding groove to prevent the sliding button from falling out of the sliding groove. When the core rod 2 rotates with the core rod bracket 1, it passes through the opening of the limiting ring 4, and the annular notch 202 at the core rod limiting head 201 located at the opening disengages from the limiting ring and engages with the overlapping part of the sliding button. When the core rod, after the overlapping engagement, slides from the top to the bottom of the sliding hole with the sliding button, the core rod pushes the pen core 10 at the pen core insertion hole to extend out along the pen core outlet hole 501 of the pen head 5.

[0028] Furthermore, the aforementioned rotating core bracket 1 can also be an assembly structure, that is, the rotating core bracket includes a core rod bracket, a positioning ring 106, and a pen refill holder 107. The core rod bracket is provided with a core rod groove 102, a central shaft hole 104, and a guide sliding hole 103. The bottom of the core rod bracket is provided with a positioning protrusion 105 and a core rod extension hole corresponding to the extension of the core rod. The positioning ring and the pen refill holder are both provided with core rod holes that are aligned and communicate with the core rod extension holes, as well as positioning pin holes 1071 that cooperate with the positioning protrusion. The core rod bracket, the positioning ring, and the pen refill holder are axially connected through the positioning pin holes and the positioning protrusion to form the rotating core bracket. The outer diameter of the positioning ring is larger than the outer diameter of the core rod bracket and the pen refill holder. That is, the rotating core bracket can rotate flexibly by cooperating with the inner diameter of the pen body through the outer diameter of the positioning ring, which effectively reduces the contact wear between the rotating core bracket and the inner wall of the pen body. In addition, the positioning ring is made of wear-resistant material, which extends the service life and makes it easy to replace.

[0029] Furthermore, the aforementioned limiting ring 4 is provided with an elastic locking head 402 at one end near the opening, and the circumference of the protruding plug 101 on the top of the rotating core bracket 1 is provided with a locking groove 1011 that forms a self-locking position with the elastic locking head. When the self-locking position is reached, the annular notch 202 at the limiting head 201 of one of the core rods 2 in the rotating core bracket and the overlapping part 701 at the inner end of the sliding button 7 form an overlapping engagement.

[0030] Furthermore, the inner end of the pen tip 5 is provided with a sleeve 502 that movably engages with the bottom of the rotating core bracket 1, and the bottom circumferential surface of the rotating core bracket is provided with an annular sealing groove 1072. By setting an annular sealing ring and forming a movable seal with the inner circumferential surface of the sleeve of the pen tip, the pen core 10 is sealed, thereby extending the service life of the pen core.

[0031] The specific usage method of this retractable eyebrow pencil is as follows: By rotating the rotating cap 6, the rotating cap drives the rotating core bracket 1 and the core rod 2 to rotate relative to the pencil body 8. Under the guidance of the limiting ring 4, the core rod rotates to the opening of the limiting ring, and the elastic locking head 402 of the limiting ring cooperates with the slot 1011 on the periphery of the plug 101 on the top of the rotating core bracket to form a self-locking position, so that the annular notch 202 of the limiting head 201 of the core rod at the opening forms a reliable connection with the overlapping part 701 of the inner end of the sliding button 7. At this time, push the sliding button to slide towards the end of the pencil tip 5, and the sliding button drives the core rod to slide towards the end of the pencil tip until the pencil lead 10 at the end of the core rod extends out along the pencil lead outlet hole 501 of the pencil tip. After extending into place, the self-locking spring 203 of the limiting head of the core rod and the corrugated toothed rod 3 achieve a self-locking position, and the eyebrow pencil can be used normally for makeup. When you need to switch the pen refill, reset the slider to the top of the sliding hole, then rotate the cap again. The refill rod at the current limit ring opening will re-enter the limit ring, and the other refill rod will enter the opening. Push the slider in the same way to extend the pen refill. If the locking is unreliable after the slider moves the refill rod to its position, replace the refill rod or the corrugated toothed rod to restore a reliable locking effect.

[0032] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Any obvious improvements or substitutions made to this utility model by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of this utility model.

Claims

1. A retractable eyebrow pencil with interchangeable lead, comprising a lead assembly, characterized in that... The pen refill assembly includes a rotating refill bracket (1), a refill rod (2), and a corrugated toothed rod (3). The rotating refill bracket has a ring array of refill rod grooves (102) arranged along the axial direction. Each refill rod groove is provided with an axially sliding refill rod. Each refill rod has a pen refill insertion hole at one end and a limiting head (201) with an annular notch (202) at the other end. The limiting head has a radially protruding self-locking spring (203). The rotating refill bracket has a central shaft hole (104) at the center of the ring array. The corrugated toothed rod is inserted and fixed in the central shaft hole. The entire radial length of the central shaft hole communicates with each refill rod groove to form a guide sliding hole (103). The guide sliding hole provides axial sliding guidance for the self-locking spring when the refill rod slides axially. The end of the self-locking spring and the tooth of the corrugated toothed rod form an elastic locking fit. When the refill rod overcomes the elastic locking force, it slides axially. When the refill rod slides to the position, it forms a self-locking position through the elastic locking force.

2. The retractable eyebrow pencil with switchable lead type according to claim 1, characterized in that... The pen refill assembly is placed inside the pen casing, which includes a pen tip (5), a pen body (8), and a rotating cap (6). The pen tip is fixed to the bottom of the pen body, and the pen tip has a pen refill outlet hole (501). The rotating refill bracket is axially limited to rotate within the pen body. A C-shaped retaining ring (4) is provided at the top of the pen body to prevent rotation. The top of the rotating refill bracket has a protrusion that connects to the rotating cap plug (101), and the retaining ring is movably fitted onto the outer diameter of the plug. When the refill rod inside the pen body is not placed at the opening of the retaining ring, the refill rod passes through the annular notch (202) at the retaining head (201) and the retaining ring. The inner edge of the ring forms an axial limit; the outer side of the pen body is provided with a sliding hole (801) along the length of the pen body, and a sliding button (7) that slides with the sliding hole. The end of the sliding button that extends into the inner hole of the pen body is provided with an overlapping part (701). When the core rod (2) rotates with the core support (1), it passes through the opening of the limiting ring, and the annular notch at the core rod limiting head located at the opening disengages from the limiting ring and engages with the overlapping part of the sliding button. When the core rod after the overlapping engagement slides from the top of the sliding hole to the bottom with the sliding button, the core rod pushes the pen core (10) at the pen core insertion hole to extend out along the pen core outlet hole of the pen tip.

3. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The rotating core support (1) includes a core rod support, a positioning ring (106) and a pen refill seat (107). The core rod support is provided with the core rod groove (102), a central shaft hole (104), and a guide sliding hole (103). The bottom of the core rod support is provided with a positioning protrusion (105) and a core rod extension hole corresponding to the core rod groove. The positioning ring and the pen refill seat are both provided with core rod holes that are aligned and communicate with the core rod extension holes, and positioning pin holes (1071) that cooperate with the positioning protrusion. The core rod support, the positioning ring, and the pen refill seat are axially connected through the positioning pin holes and the positioning protrusion to form the rotating core support. The outer diameter of the positioning ring is larger than the outer diameter of the core rod support and the pen refill seat. That is, the rotating core support is able to rotate by cooperating with the inner diameter of the pen body (8) through the outer diameter of the positioning ring.

4. The retractable eyebrow pencil with switchable lead type according to claim 3, characterized in that... The positioning ring (106) is a wear-resistant sheet.

5. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The limiting ring (4) has an elastic locking head (402) at one end near the opening. The plug (101) protruding at the top of the rotating core bracket (1) has a locking groove (1011) that forms a self-locking position with the elastic locking head. When the self-locking position is reached, the annular notch (202) at the limiting head (201) of one of the core rods (2) in the rotating core bracket forms an overlapping fit with the overlapping part (701) at the inner end of the sliding button (7).

6. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The bottom outer diameter of the rotating cap (6) is provided with a limiting flange (601), and the rotating cap is axially slid to the top of the pen body after being inserted into the bottom of the pen body (8), and is limited by the limiting flange at the constricted opening at the top of the pen body; the outer diameter of the limiting ring is provided with a positioning part (401), the limiting flange of the rotating cap limits the top surface of the limiting ring, and the inner diameter of the pen body is provided with a limiting groove that cooperates with the positioning part to limit the rotation of the limiting ring; the top of the rotating core bracket is axially limited to the rotating cap, and the bottom of the rotating core bracket is axially limited to the inner end of the pen tip (5).

7. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The bottom insertion limit of the corrugated toothed rod (3) is located in the bottom insertion hole of the central shaft hole (104) of the rotating core bracket (1), and the top insertion limit of the corrugated toothed rod is located at the inner end of the rotating cap (6).

8. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The inner end of the pen tip (5) is provided with a sleeve (502) that is movably fitted with the bottom of the rotating core bracket (1), and the bottom circumferential surface of the rotating core bracket is provided with an annular sealing groove (1072), and a movable seal is formed between the annular sealing ring and the inner circumferential surface of the sleeve of the pen tip.

9. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The end of the sliding button (7) that extends into the sliding hole is limited to the inner side of the sliding groove by an elastic hook (702).

10. The retractable eyebrow pencil with switchable lead type according to claim 2, characterized in that... The pen tip (5) end of the pen casing is sealed and connected to the pen cap (9).

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