Cosmetic pencil and using method thereof

Abstract

The cosmetic pencil comprises a pencil body and a pencil core, a pencil core cavity is formed in the pencil body, and a pencil core outlet is formed in the front end of the pencil core cavity; a propelling mechanism is further arranged in the pen body and provided with a push rod, a refill sleeve wrapping the whole section of refill and a stop structure limiting the movement stroke of the refill sleeve are further arranged in the refill cavity, a friction push head is arranged at the front end of the push rod, and the refill cavity is provided with a channel extending to the refill outlet and allowing the front end of the refill sleeve to pass through. And due to the movement stroke, the front end part of the refill sleeve can forwards extend out of the refill outlet through the channel and backwards retract into the refill cavity. The refill sleeve can extend out of the refill outlet, on the basis, the refill is pushed out of the refill sleeve, and when a user uses the cosmetic pencil, the cosmetic operation requirement can be met only by exposing a small section of the refill. Therefore, even if the pen refill is particularly thin or / and particularly soft, the exposed pen refill is not easy to break by means of the supporting effect of the pen refill sleeve on the pen refill.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cosmetics, in particular to a cosmetic pencil and a method for using the same. BACKGROUND

[0002] In modern society, people will use a cosmetic pencil to make up the eyebrows, eye corners, cheeks, lips and other parts to achieve the effect of improving the delicacy of the facial makeup. The existing cosmetic pencil usually includes a pencil body and a pencil cap, the pencil body is provided with a pencil core and a pushing mechanism for pushing the pencil core out of the pencil body, the pushing mechanism usually includes a push rod, only a very short part of the pencil core at the rear end is fixed on the front end of the push rod, and the vast majority of the pencil core except the rear end part is located in the pencil body without support, which leads to the pencil core being easily deformed when the temperature changes. Once deformed, the pencil core is difficult to push out and the effect of drawing eyebrows is poor, and the pencil core has the risk of falling off or breaking off from the push rod in the case of falling, collision and the like.

[0003] To solve the technical problem, the applicant invented a cosmetic pencil and a manufacturing method thereof, which is disclosed in the Chinese patent document with publication number CN119586850A. The cosmetic pencil includes a pencil body, a pencil core and a pushing mechanism, the pencil body has a pencil core cavity with a pencil core outlet, the push rod of the pushing mechanism can advance and retreat in the pencil body, the pencil core cavity is provided with a pencil core sleeve wrapping the entire pencil core and a stop structure limiting the stroke of the pencil core sleeve, and the front end of the push rod has a friction push head extending into the pencil core sleeve and in frictional contact with the inner wall thereof. The pencil core sleeve wrapping the entire pencil core can avoid deformation, falling off or breaking off of the pencil core due to temperature changes. When the push rod is pushed, the friction push head drives the pencil core sleeve and the pencil core to advance by friction, and the pencil core sleeve stops after contacting the stop structure, but the friction push head can continue to push the pencil core out of the pencil core outlet by overcoming the friction. When the push rod is retracted, the friction push head drives the pencil core sleeve and the pencil core to retreat and reset. The user can adjust the exposed length of the pencil core by the pushing mechanism to meet the makeup needs, the structure is simple, the use is convenient, and the stability and service life of the pencil core are improved.

[0004] In the above patent document, the pencil core sleeve in the cosmetic pencil can only advance and retreat inside the pencil core cavity and cannot extend out of the pencil core outlet. However, as known to all, to improve the eyebrow drawing effect, the pencil core needs to be as thin and soft as possible without breaking. Since the pencil core sleeve in the cosmetic pencil can only advance and retreat inside the pencil core cavity and cannot extend out of the pencil core outlet, there is a distance between the front end outlet of the pencil core sleeve and the pencil core outlet. When the pencil core is relatively thin and soft, the end of the pencil core has a risk of breaking during the pushing process after leaving the pencil core sleeve without extending out of the pencil core outlet. Even if the end of the pencil core can be pushed out of the pencil core outlet, the part of the pencil core between the end of the pencil core and the front end outlet of the pencil core sleeve in the pencil core cavity is relatively long without the support of the pencil core sleeve, and there is an inevitable gap between the part and the pencil core outlet, which leads to the risk of breaking of the part during the makeup process.

[0005] In addition, when the refill is relatively thin, the total amount of moisture contained in the refill is also relatively low, which leads to the fact that the refill is prone to moisture loss and dryness and thus loses the use function. SUMMARY

[0006] Therefore, in order to solve the above technical problems, the present application provides a cosmetic pen, which can make the refill sleeve extend out of the refill outlet, so as to reduce the length of the refill exposed outside the refill sleeve during use, thereby further reducing the risk of the refill being easily broken.

[0007] The object of the present application can be achieved by the following technical solutions: A cosmetic pen comprises: a pen body, which has a refill cavity inside, and the front end of the refill cavity has a refill outlet; a refill, which is arranged in the refill cavity; a pushing mechanism, which is arranged in the pen body and has a push rod capable of advancing or retreating in the pen body; a refill sleeve, which is arranged in the refill cavity and wraps the entire refill; a stop structure, which is arranged in the pen body and is used for limiting the movement stroke of the refill sleeve; the push rod has a friction push head at the front end, which extends into the refill sleeve and is in frictional contact with the inner wall of the refill sleeve; the refill cavity has a passage extending to the refill outlet, which allows the front end of the refill sleeve to pass through, and the movement stroke enables the front end of the refill sleeve to extend forward out of the refill outlet through the passage and to retract backward into the refill cavity.

[0008] By using the above technical solutions, the refill sleeve can extend out of the refill outlet, and on this basis, the refill is pushed out of the refill sleeve. When the user uses the cosmetic pen, only a small length (for example, only 1-2 mm) of the refill needs to be exposed outside the refill sleeve. In this way, even if the refill is particularly thin or / and soft, the exposed refill is not prone to being broken, thanks to the wrapping and supporting effect of the refill sleeve on the refill.

[0009] In the specific embodiment of the present application, the pen body further has a sealing gasket arranged to block the rear end port of the refill cavity, and the sealing gasket has a through hole sealing the push rod. In this way, the sealing gasket can block the rear end of the refill cavity, so that the refill cavity is isolated from other spaces in the pen body, only a very small amount of air in the refill cavity is in contact with the refill, which can prevent the moisture in the refill from being lost and dry, thereby effectively prolonging the service life of the refill.

[0010] This invention is applicable to relatively thin or fine pen refills. For example, for pen refills with irregular cross-sections, the minimum cross-sectional thickness can be 0.9 mm; for cylindrical pen refills, the minimum diameter can be 0.9 mm. These thin or fine pen refills can meet the user's needs for fine line drawing or detailed makeup application. However, with the structural solution of this invention, the exposed part of the pen refill is less likely to break during use.

[0011] In a specific embodiment of the present invention, the pen refill cavity is divided into a main body section that adapts to the pen refill sleeve and a travel section located behind the main body section. The junction of the main body section and the travel section forms a stop step of the stop structure, and the rear end of the pen refill sleeve has a flange located within the travel section. Thus, the stop step is directly formed at the junction of the main body section and the travel section, eliminating the need for additional independent stop parts and reducing the number of components and assembly steps. Secondly, the flange at the rear end of the pen refill sleeve is confined within the travel section. When the pen refill sleeve moves forward, the flange is precisely blocked by the stop step, forming a rigid limit, effectively restricting the forward movement limit of the pen refill sleeve and preventing it from over-extending or shifting; at the same time, it provides limiting support for the subsequent push rod action that pushes the pen refill.

[0012] In a specific embodiment of the present invention, the channel extends from the stop step to the pen refill outlet. In this way, the channel provides a continuous axial movement path for the pen refill sleeve, guiding and supporting its forward and backward movement, preventing radial offset or jamming during displacement, and ensuring smooth and stable forward and backward movement.

[0013] In a specific embodiment of the present invention, a bushing that contacts the sealing gasket is fixed inside the pen body, located behind the sealing gasket. The sealing gasket and the bushing are injection molded into a single structure. The sealing gasket and bushing are manufactured into a seamless integral structure using an injection molding process, eliminating gaps that may exist in separate assemblies. This provides a reliable seal to the front end of the bushing, effectively preventing communication between the space inside the pen refill cavity and the space inside the bushing, as well as other spaces inside the pen barrel. Simultaneously, this integrated structure design eliminates the need for separate processing and assembly of the sealing gasket, simplifying the production process and improving manufacturing efficiency while reducing production costs.

[0014] In a specific embodiment of the present invention, the pen body includes a pen tip fixed to the front section of the bushing and a pen barrel rotatably disposed at the rear section of the bushing. The push rod has a threaded section extending into the pen barrel. The pen barrel is provided with a helical sleeve that rotates with the pen barrel and engages with the threaded section. The pen body is provided with a circumferential stop structure to restrict the rotation of the push rod. The bushing is provided with elastic protrusions. The inner wall of the pen barrel is provided with grooves evenly distributed along the circumference, allowing the elastic protrusions to sequentially enter the grooves. In this way, the length of the pen refill extending out of the refill sleeve can be precisely controlled during the process of turning the pen barrel.

[0015] In another aspect, the present invention provides a method for using a cosmetic pen. This method involves actuating the propulsion mechanism to advance the push rod, utilizing the friction between the push rod's frictional push head and the inner wall of the pen tip sleeve to drive the pen tip sleeve and the pen tip forward together. When the pen tip sleeve is blocked by the stop structure, the front end of the pen tip sleeve extends through the channel to the pen tip outlet. If the front end of the pen tip sleeve is outside the pen tip outlet, the propulsion mechanism is actuated to continue advancing the push rod, causing the frictional push head of the push rod to overcome the friction with the inner wall of the pen tip sleeve and push the pen tip out from the front port of the pen tip sleeve. Alternatively, the propulsion mechanism can be actuated to retract the push rod, utilizing the friction between the push rod's frictional push head and the inner wall of the pen tip sleeve to drive the pen tip sleeve and the pen tip back into the pen tip cavity.

[0016] Therefore, by adopting the above technical solution, this invention is suitable for the use of ultra-fine or ultra-thin pen refills. The design of the pen refill sleeve extending beyond the pen refill outlet, combined with a structure that fully encloses the pen refill, allows only a very short length of the refill to be exposed for use, significantly reducing the risk of breakage for ultra-fine or / and relatively soft pen refills, and meeting the needs of delicate makeup application. The sealing gasket (which can be integrally injection molded with the bushing) isolates the pen refill cavity from other spaces, preventing the pen refill from drying out and extending its lifespan. The one-piece molded stop structure and smooth channel guidance simplify the structure and reduce production and assembly costs. The elastic protrusions and grooves work together to precisely control the pen refill extension length, ensuring convenient and stable operation. Attached Figure Description

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the cosmetic pen of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view at point B in the middle; Figure 4 yes Figure 1 Enlarged view at point C; Figure 5 yes Figure 1 Sectional view at point DD; Figure 6 This is a schematic diagram of the pen tip structure of the present invention; Figure 7 This is a schematic diagram of the bushing structure of the present invention; Figure 8 This is a schematic diagram of the pen barrel structure of the present invention; Figure 9 This is a schematic diagram of the spiral sleeve of the present invention; Figure 10 This is a schematic diagram of the structure of the pen refill sleeve of the present invention; Figure 11 This is a schematic diagram of the push rod structure of the present invention; Figure 12 The image shows the pen cap fastened to the pen body. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 and Figure 12 As shown, the present invention is a cosmetic pen, including a pen body 100, a pen core 200 disposed in the pen body 100 and a propulsion mechanism 300, and a pen cap 400 sleeved with the pen body 100.

[0021] In this embodiment, the pen lead 200 is a thin cylindrical pen lead with a diameter of 0.9 mm. This pen lead structure can meet the user's needs for fine line drawing or detailed makeup processing. The pen lead 200 can also be a pen lead with an irregular cross-section and a thickness as thin as 0.9 mm.

[0022] In addition, the pen body 100 is composed of a pen tip 110, a bushing 120 and a pen barrel 130.

[0023] like Figure 1 , Figure 2 and Figure 6 As shown, the pen tip 110 has a through-hole refill cavity 500 inside, and its outer periphery is divided into a conical section 111 and a cylindrical section 112 located at the rear, from front to back. The front end of the refill cavity 500 has a refill outlet 510, and the refill cavity 500 forms a main body section 520 and a travel section 530 with progressively increasing apertures from front to back. A stop step 531 is formed at the junction of the main body section 520 and the travel section 530. This stop step 531 is the stop structure of the present invention. The pen tip 110 also has a sleeve section 540 located behind the travel section. Here, the length of the main body section 520 accounts for the majority of the total length of the refill cavity 500.

[0024] like Figure 1 , Figure 2 and Figure 10As shown, it also includes a pen refill sleeve 600 installed in the pen refill cavity 500. The inner wall of the pen refill sleeve 600 forms a through pen refill hole 601, and the entire pen refill 200 is completely filled into the pen refill hole 601 of the pen refill sleeve 600, that is, the pen refill sleeve 600 can cover the entire pen refill. The pen refill sleeve covers the entire pen refill, and due to the support of the pen refill sleeve, the pen refill will not deform due to temperature changes, and there is no risk of it falling off or breaking. The main body of the pen refill sleeve 600 is located in the main body section 520 of the pen refill cavity 500, and the rear end has a flange 602 with a raised circumferential surface located in the stroke section 530. The diameter of the pen refill outlet 510 is larger than the outer diameter of the front end of the pen refill sleeve 600. In this embodiment, the main body section 520 also forms a channel for the front end of the pen refill sleeve to extend from the pen refill outlet.

[0025] In this embodiment, the channel extends from the stop step to the pen refill outlet 510. The channel provides a continuous axial movement path for the pen refill sleeve, which can guide and support the forward and backward movement of the pen refill sleeve, avoiding problems such as radial offset and jamming during the displacement process, and ensuring the smoothness and stability of the forward and backward movement.

[0026] In this invention, the travel distance defined by the stop step 531 should allow the front end of the pen refill sleeve to extend forward through the channel to the pen refill outlet 510 and then retract backward into the pen refill cavity 500. In other words, the length of the travel distance should be greater than the distance from the initial position of the pen refill sleeve within the pen refill cavity (i.e., the position where the pen refill sleeve is completely retracted into the pen refill cavity) to the pen refill outlet. In this embodiment, the travel distance allows the pen refill sleeve to extend 2-3 mm beyond the pen refill outlet.

[0027] like Figure 1 , Figure 6 , Figure 7 As shown, the sleeve section 540 of the pen tip 110 is sleeved on the front section 121 of the bushing 120. A circumferential stop structure and an axial stop structure are provided between the sleeve section 540 and the front section 121. The circumferential stop structure prevents the pen tip 110 from rotating relative to the bushing 120, and the axial stop structure prevents the pen tip 110 from moving axially relative to the bushing 120, thus fixing the pen tip 110 to the front section 121 of the bushing 120.

[0028] like Figure 1 , Figure 3 , Figure 6 and Figure 8 As shown, the pen barrel 130 is a cylindrical rod with an internal pen barrel cavity 700 that is closed at the rear and open at the front. This pen barrel cavity 700 is divided into an open section 710, a middle section 720, and a rear section 730 from front to back. The open section 710 is fitted onto the rear section 122 of the bushing 120, and there is an axial stop structure between them, but no circumferential stop structure, meaning that the pen barrel 130 can rotate relative to the bushing 120.

[0029] like Figure 1 , Figure 9 and Figure 11 As shown, the propulsion mechanism 300 includes a push rod 310 and a spiral sleeve 320 that causes the push rod 310 to move forward and backward. The spiral sleeve 320 is disposed in the pen barrel 130.

[0030] like Figure 1 , Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 11 As shown, the push rod 310 is divided into a smooth section 311 and a threaded section 312 from front to back. The smooth section 311 extends out of the bushing 120 and has a friction pusher 313 at its front end that inserts into the pen refill hole 601 from the rear end of the pen refill sleeve 600. The structure of this friction pusher 313 has been disclosed in Chinese patent document CN119586850A and will not be described again here. The threaded section 312 is located in the middle section 720 and the rear section 730 of the pen barrel cavity 700. The inner wall of the rear section 730 has first protruding ridges 731 evenly distributed circumferentially. The front end of the first protruding ridge 731 has a positioning step 7311 and a flat protrusion 7312 extending in front of the positioning step 7311. The spiral sleeve 320 is located in the middle section 720 and is fitted onto the threaded section 312. Its front end face is stopped by the rear end face of the bushing 120, and its rear end face is stopped by the stopping step 7311. The circumferential surface of the screw sleeve 320 also has a raised strip 321 located in the gap between two adjacent flat protrusions 7312. The inner surface of the screw sleeve 320 has threads 323 that engage with the threaded section 312. With this structure, the screw sleeve 320 rotates together with the pen barrel 130.

[0031] like Figure 3 , Figure 7 and Figure 8 As shown, elastic protrusions 123 are provided on the bushing 120. The inner wall of the pen barrel has evenly spaced protrusions distributed along the circumference, allowing the elastic protrusions to sequentially enter the grooves 127. Specifically, a pair of openings 125 are symmetrically arranged on the rear section 122 of the bushing 120. There are two elastic protrusions 123, correspondingly positioned within the openings 125. Each elastic protrusion 123 includes a spring piece 126. The root of the spring piece 126 is connected to the front end face of the opening 125, and the outer surface of its head has an outwardly protruding protrusion 124. Short ridges are evenly spaced along the circumference on the inner wall of the pen barrel cavity 700, forming the aforementioned grooves 127 between adjacent short ridges. Thus, during the rotation of the pen barrel, the protrusions 124 can sequentially enter each groove 127, enabling more precise control of the pen refill being expelled from the refill sleeve.

[0032] When in use, the pen barrel 130 is rotated forward relative to the pen tip 110. The pen barrel 130 drives the spiral sleeve 320 inside the pen barrel 130 to rotate as well. The spiral sleeve 320 then drives the push rod 310 to move forward along the axial direction of the bushing 120 through the meshing transmission with the threaded section 312 of the push rod 310. The friction push head 313 at the front end of the push rod 310 drives the pen refill sleeve 600 and the pen refill 200 forward through the friction with the inner wall of the pen refill sleeve 600. Because the pen refill is thin and long, the pen refill of this structure is very fragile and easily broken under force. Now, by designing the pen refill outlet 510 and the diameter of the channel to be larger than the outer diameter of the front end of the pen refill sleeve 600, the front end of the pen refill sleeve 600 can extend out of the pen refill outlet 510. The pen refill sleeve 600 extending out of the pen refill outlet can continue to guide and support the pen refill 200, preventing the pen refill 200 from bending and breaking under force. The stop step 531 is positioned so that when the flange 602 at the rear end of the pen refill sleeve 600 touches the stop step 531, the front end of the pen refill sleeve 600 can extend out of the pen refill outlet 510. Specifically, when the flange 602 at the rear end of the pen refill sleeve 600 touches the stop step 531, which serves as a stop structure, the front end of the pen refill sleeve 600 extends out of the pen refill outlet 510. If the pen barrel continues to rotate forward, the pen refill sleeve 600 will be stopped by the stop structure and unable to move forward. The friction push head 313 will overcome the friction with the inner wall of the pen refill sleeve 600 and continue to move forward, thereby pushing the pen refill 200 to continue moving forward within the pen refill sleeve 600 and causing the pen refill 200 to be squeezed out of the pen refill sleeve 600. When the desired exposed length (e.g., 1-2 mm) is reached, the rotation of the pen barrel 130 stops. At this time, the user can use the part of the pen refill 200 exposed outside the pen tip 110 for makeup application. After the user finishes applying makeup, by rotating the pen barrel in the reverse direction, the spiral sleeve 320 drives the push rod 310 backward. At this time, the friction push head 313 of the push rod 310 again uses the friction with the inner wall of the pen refill sleeve 600 to drive the pen refill sleeve 600, which in turn drives the pen refill 200 back, so that the part of the pen refill 200 protruding outside the pen tip 110 and the front end of the pen refill sleeve 600 retract into the pen refill cavity 500 of the pen tip 110. When the pen barrel 130 is rotated forward again, the pen refill 200 and the front end of the pen refill sleeve 600 can be pushed out of the pen tip 110 again. Of course, during use, if it is found that the part of the pen refill 200 protruding outside the pen refill sleeve 600 is too short, by continuing to rotate the pen barrel 130 forward, more of the pen refill 200 can be protruding outside the pen tip 110 to achieve the desired protrusion length.

[0033] Therefore, the pen tip sleeve 600 extends beyond the pen tip outlet 510, and the pen tip 200 is further extended beyond the pen tip sleeve 600. When using the makeup pen, the user only needs to expose a small portion to meet their makeup application needs. In this way, even if the pen tip is particularly thin and / or relatively soft, the exposed pen tip is not easily broken thanks to the support and enclosure provided by the pen tip sleeve.

[0034] like Figure 1 and Figure 2 As shown, a sealing gasket 128 is also provided inside the pen body 100 to seal the rear end of the refill cavity 500. The sealing gasket 128 has a through hole 129 that allows the sealing sleeve to fit on the push rod. The through hole 129 is a tapered hole that is smaller at the front and larger at the back, which provides a better sealing effect when fitted onto the push rod. By sealing the rear end of the refill cavity 500 with the sealing gasket 128, the refill cavity 500 is isolated from other spaces inside the pen body 100, allowing only a very small amount of air inside the refill cavity 500 to come into contact with the refill 200. This prevents the refill from drying out due to moisture loss from the rear end of the refill 200, thereby effectively extending the lifespan of the refill. To prevent moisture loss from the front end of the refill, in this invention, the internal cavity of the pen cap 400 should also be as small as possible, just large enough to fit snugly against the pen tip. In this way, after the pen cap is fastened to the pen tip, only a very small amount of air remains in the internal cavity of the pen cap 400, which comes into contact with the pen refill, thereby further preventing the pen refill from drying out due to moisture loss from the front end of the pen refill 200.

[0035] In this embodiment, the sealing gasket 128 can be connected to the front port of the bushing. The sealing gasket 128 can be made of rubber, and the bushing 120 can be made of plastic. The sealing gasket 128 and the bushing 120 are injection molded into a single structure. In this way, the sealing gasket 128 and the bushing 120 are made into a seamless integral structure by injection molding, eliminating the gaps that may exist in separate assembly, and can reliably seal the front port of the bushing 120, effectively blocking the communication between the space inside the pen refill cavity 500 and the space inside the bushing 120 and other spaces inside the pen barrel 130. At the same time, this one-piece molding design eliminates the need for separate processing and independent assembly of the sealing gasket, simplifies the production process, and helps to improve manufacturing efficiency and reduce production costs.

[0036] In this embodiment, as Figure 7 and Figure 11As shown, the threaded section 312 of the push rod 310 has a circumferential stop structure with respect to the bushing 120, but no axial stop structure. That is, the push rod 310, constrained by the bushing 120, can only move axially relative to the bushing 120. The circumferential stop structure between the threaded section 312 and the bushing 120 consists of a first plane 314 on both sides of the threaded section 312 and a second plane 315 on both sides of the inner wall of the bushing 120 opening, which mates with the first plane 314. Through the mutual engagement of the first plane 314 and the second plane 315, the push rod 310 can only move axially forward or backward, and cannot rotate relative to the bushing 120.

[0037] In this embodiment, as Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, the circumferential stop structure between the sleeve section 540 and the front section 121 consists of a positioning groove 541 on the inner wall of the opening of the sleeve section 540 and a positioning protrusion 1211 on the front section 121 and engaged in the positioning groove 541. The axial stop structure between the sleeve section 540 and the front section 121 consists of a first annular groove 542 on the inner wall of the sleeve section 540 and a first annular protrusion 1212 on the outer surface of the front section 121 and engaged in the first annular groove 542. The axial stop structure between the opening section 710 and the rear section 122 consists of a second annular groove 711 on the inner wall of the opening section 710 and a second annular protrusion 1221 on the outer surface of the rear section 122 and engaged in the second annular groove 711.

[0038] like Figure 3 As shown, in order to allow the pen barrel 130 to rotate smoothly on the bushing 120, a sealing ring groove 1222 is provided on the outer surface of the rear section 122 in front of the second annular protrusion 1221. A sealing ring 1223 is fixed in the sealing ring groove 1222, which contacts the inner wall of the opening section 710 of the pen barrel 130.

[0039] The above is the cosmetic pen of this embodiment. The steps of its use are as follows: The push mechanism 300 is activated to advance the push rod 310. The friction force between the friction push head 313 of the push rod 310 and the inner wall of the pen refill sleeve 600 drives the pen refill sleeve 600 and the pen refill 200 forward together. When the pen refill sleeve 600 is blocked by the stop structure, the front end of the pen refill sleeve 600 extends through the channel to the outside of the pen refill outlet 510. When the front end of the pen refill sleeve 600 is outside the pen refill outlet 510, the action... The pushing mechanism 300 causes the push rod 310 to continue moving forward, so that the friction push head 313 of the push rod 310 overcomes the frictional force with the inner wall of the pen refill sleeve 600 and pushes the pen refill 200 out from the front port of the pen refill sleeve 600. Alternatively, the pushing mechanism 300 can be used to cause the push rod 310 to retract, and the frictional force between the friction push head 313 of the push rod 310 and the inner wall of the pen refill sleeve 600 can be used to drive the pen refill sleeve 600 and the pen refill 200 to retract together into the pen refill cavity 500.

[0040] As can be seen from the above detailed description, the cosmetic pen with a lead core described in this invention has the following core advantages: 1. Significantly reduces the risk of breakage of ultra-fine or / and relatively soft pen leads. The pen tip sleeve extends out to the pen tip outlet as the push rod moves forward. When in use, only a very short length of the pen tip (such as 1-2mm) needs to be exposed to meet makeup needs. Relying on the pen tip sleeve's ability to wrap and support the entire pen tip, even if the pen tip diameter is very small or the material is relatively soft, it can effectively prevent breakage during use, making it suitable for the needs of fine line drawing and detailed makeup treatment.

[0041] 2. Extends the lifespan of the pen refill. The pen body is equipped with a sealing gasket to seal the rear port of the pen refill cavity. The sealing gasket and the bushing can be injection molded as a single unit, which can effectively isolate the pen refill cavity from other spaces inside the pen body, reduce the contact between the pen refill and the air, prevent the moisture inside the pen refill from being lost and drying out, and thus extend the life of the pen refill.

[0042] 3. Simplified structure, reducing production and assembly costs. The stop structure is directly formed from the junction of the main body section and the stroke section of the pen core cavity to form the stop step, eliminating the need for additional independent stop parts and reducing the number of parts; the sealing gasket and bushing are integrally injection molded, eliminating the need for separate processing and assembly of the sealing gasket, simplifying the production process, improving manufacturing efficiency and reducing production costs.

[0043] 4. The pen refill sleeve moves smoothly and stably, without any risk of jamming. The channel extending to the pen refill outlet provides a continuous axial movement path for the pen refill sleeve, which can guide and support the forward and backward movement of the pen refill sleeve, avoiding problems such as radial offset and jamming during displacement, and ensuring smooth operation during use.

[0044] 5. Precise control over the pen lead extension length, and convenient operation. The elastic protrusion on the bushing cooperates with the groove on the inner wall of the pen barrel, allowing precise control over the length of the pen refill extending from the refill sleeve while turning the pen barrel; at the same time, the friction push head of the push rod can first drive the refill sleeve and the pen refill to move synchronously, and then push the pen refill separately after the refill sleeve is limited. The operation logic is consistent and the user experience is excellent.

Claims

1. A makeup brush, comprising: The pen body has a pen core cavity inside, and the front end of the pen core cavity has a pen core outlet; The pen refill is disposed within the pen refill cavity; A propulsion mechanism is disposed within the pen body and has a push rod capable of moving forward or backward within the pen body; Pen refill sleeve, wherein the pen refill sleeve is disposed inside the pen refill cavity and covers the entire pen refill: A stop structure is provided inside the pen body to limit the travel of the pen refill sleeve. The push rod has a friction push head at its front end that extends into the pen refill sleeve and rubs against the inner wall of the pen refill sleeve; The feature is that the pen refill cavity has a channel extending to the pen refill outlet, allowing the front end of the pen refill sleeve to pass through, and the movement stroke allows the front end of the pen refill sleeve to extend forward through the channel to the pen refill outlet and retract backward into the pen refill cavity.

2. The cosmetic pen according to claim 1, characterized in that, The pen body is also provided with a sealing gasket that seals the rear port of the pen core cavity, and the sealing gasket has a through hole that seals the push rod.

3. The cosmetic pen according to claim 1, characterized in that, The minimum cross-sectional thickness of the pen refill is 0.9 mm.

4. The cosmetic pen according to claim 1, characterized in that, The pen refill is a cylindrical refill with a minimum diameter of 0.9 mm.

5. The cosmetic pen according to claim 1, characterized in that, The pen refill cavity is divided into a main body section that fits the pen refill sleeve and a travel section located behind the main body section. The junction of the main body section and the travel section forms a stop step of the stop structure. The rear end of the pen refill sleeve has a flange located within the travel section.

6. The cosmetic pen according to claim 5, characterized in that, The channel extends from the stop step to the pen refill outlet.

7. The cosmetic pen according to claim 2, characterized in that, A bushing that contacts the sealing gasket is fixed inside the pen body behind the sealing gasket.

8. The cosmetic pen according to claim 7, characterized in that, The sealing gasket and the bushing are injection molded into a single structure.

9. The cosmetic pen according to claim 7, characterized in that, The pen body includes a pen tip fixed to the front section of the bushing and a pen barrel rotatably disposed at the rear section of the bushing. The push rod has a threaded section extending into the pen barrel. The pen barrel is provided with a helical sleeve that rotates with the pen barrel and engages with the threaded section. The pen body is provided with a circumferential stop structure that restricts the rotation of the push rod. The bushing is provided with elastic protrusions. The inner wall of the pen barrel is provided with grooves distributed at equal intervals along the circumference, so that the elastic protrusions can sequentially enter the grooves.

10. A method of using a cosmetic pen as described in any one of claims 1 to 9, characterized in that, The push mechanism is activated to advance the push rod, using the friction force between the push rod's friction head and the inner wall of the pen refill sleeve to drive the pen refill sleeve and the pen refill forward together. When the pen refill sleeve is blocked by the stop structure, the front end of the pen refill sleeve extends out of the pen refill outlet through the channel. When the front end of the pen refill sleeve is outside the pen refill outlet, the push mechanism is activated to continue advancing the push rod, causing the friction head of the push rod to overcome the friction force with the inner wall of the pen refill sleeve and push the pen refill out from the front port of the pen refill sleeve. Alternatively, the push mechanism is activated to retract the push rod, using the friction force between the push rod's friction head and the inner wall of the pen refill sleeve to drive the pen refill sleeve and the pen refill back into the pen refill cavity.

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