Rotary color-changing double-rod double-head marking pen

Abstract

The invention discloses a rotary color-changing double-rod double-head marking pen which comprises two marking pen bodies with different colors and an ink mixer, and the ink mixer is in a hollow tubular shape and is provided with a deformation part capable of generating elastic deformation. The rotary color-changing double-rod double-head marking pen has two states, namely an original assembly state and an ink mixing state, in the original assembly state, the two marking pens are inserted from the two ends of the ink mixer respectively, and pen heads of the two marking pens are opposite to each other and do not make contact with each other; when torsion in opposite directions is applied to the two marking pens to enable the two marking pens to drive the two ends of the ink mixer to rotate in the opposite directions, the deformation part can be forced to be distorted and deformed, so that the length of the ink mixer is shortened, and the two pen points abut against each other for mutual ink channeling and color mixing. At the moment, the rotary color-changing double-rod double-head marking pen is in an ink mixing state. The ink of the two marking pens can mutually permeate into the pen points of the two marking pens, ink channeling and color changing are completed, and selection of a user on the number of colors is increased.

Description

Technical Field

[0001] This invention relates to the field of pen technology, and in particular to a rotating, color-changing, dual-barrel, dual-head marker. Background Technology

[0002] Currently, common traditional art drawing, student illustration, comic design, and writing tools such as watercolor pens, whiteboard markers, and acrylic markers, especially watercolor pens intended for art enthusiasts and children's intellectual development, are all designed to be single-color pens, with each pen containing only one color of watercolor ink for individual use. Manufacturers generally can only produce a few dozen colors, which limits the range of colors available for art enthusiasts. This results in monotonous colors that are not vibrant or eye-catching, lacking artistic flair and affecting the overall visual appeal and aesthetics of the artwork.

[0003] In order to achieve more diverse drawing and writing effects, although some double-headed or even multi-headed markers have appeared on the market, most of these markers are simply combinations of different colored tips, which cannot achieve color mixing and variation, and thus cannot meet the needs of multiple colors or mixed colors in specific situations.

[0004] Therefore, in order to satisfy the pursuit of painting enthusiasts for more colors and color mixing gradients, and to bring users unlimited space for imagination and creative ability enhancement, so as to enrich and satisfy people's cultural life, it is necessary to make bold innovations and breakthroughs in existing markers and develop a color-changing double-barreled double-headed marker. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a rotating color-changing dual-barrel dual-head marker to overcome the defect of existing markers that cannot change color.

[0006] The technical solution adopted by this invention to solve its technical problem is: a rotating color-changing dual-barreled dual-headed marker, comprising: two markers of different colors and an ink mixer, wherein the ink mixer is a hollow tube with a deformable part capable of elastic deformation; the rotating color-changing dual-barreled dual-headed marker has two states, namely, an original assembly state and an ink mixing state. In the original assembly state, the two markers are inserted from both ends of the ink mixer, with the tips of the two markers facing each other but not in contact; when a torque is applied to the two markers in opposite directions, causing the two markers to rotate the two ends of the ink mixer in opposite directions, the deformable part is forced to twist and deform, thereby shortening the length of the ink mixer, so that the two marker tips come into contact with each other and mix ink, at which point the rotating color-changing dual-barreled dual-headed marker is in the ink mixing state.

[0007] As a further improvement of the present invention, both ends of the ink mixer are provided with plug tubes for inserting the marker pen, and at least one of the plug tubes is provided with multiple windows along the circumferential direction, and the connecting rib between two adjacent windows forms the deformable part.

[0008] As a further improvement of the present invention, each of the plug tubes located within the window is provided with a limiting post extending along the axial direction. Each limiting post is provided with a notch, and two opposing stop surfaces are formed at the notch. The two stop surfaces are used to stop each other in the ink-mixed state to limit the stroke of the marker pen along the axial direction.

[0009] As a further improvement of the present invention, the marker pen and the inner wall of the insertion tube are provided with circumferential positioning features. In the original assembly state and the ink mixing state, the marker pen is circumferentially positioned by the circumferential positioning features to limit the relative rotation of the insertion tube and the marker pen inserted therein in the circumferential direction.

[0010] As a further improvement of the present invention, the ink mixer is provided with a connecting tube in the middle, and the connecting tube is fixedly connected between the two plug tubes. In the ink mixing state, the two pen tips abut against each other in the connecting tube to mix ink.

[0011] As a further improvement of the present invention, the rotary color-changing dual-barrel dual-head marker also includes a pen sleeve, which is tubular and fitted onto the ink mixer; each of the two plug tubes has an annular first step at one end that is close to each other, and the inner surface of the pen sleeve has a first ring rib, the first step and the first ring rib are transitionally fitted to achieve axial positioning of the ink mixer and the pen sleeve.

[0012] As a further improvement of the present invention, each of the two plug-in cylinders is provided with a plurality of raised ribs evenly distributed circumferentially on its outer surface at the other ends of the two plug-in cylinders that are far apart from each other, and the plurality of raised ribs are all in clearance fit with the inner surface of the pen cap.

[0013] As a further improvement of the present invention, both markers include a tail plug, a barrel, a core, and a tip. The barrel is a hollow, stepped cylinder with a certain wall thickness. The core is built into the barrel. The tip is installed at one end of the barrel and inserted into the core. The tail plug is installed at the other end of the barrel and presses against the core. The barrel has a second step, which abuts against the end face of the ink mixer in the original assembled state.

[0014] As a further improvement of the present invention, the ink mixer is integrally injection molded from plastic material; the pen tip is processed from fiber material.

[0015] As a further improvement of the present invention, in the original assembled state, the distance between the two pen tips is 0.7mm-1mm.

[0016] The beneficial effects of this invention are as follows: This invention provides a rotating color-changing dual-barrel dual-head marker. By setting two markers of different colors and an ink mixer, and providing a deformation part on the ink mixer, when both hands hold the two different colored markers and rotate them in opposite directions by a certain angle, the deformation part is twisted and elastically deformed along the axial direction under the action of torque, which shortens the length of the ink mixer. The two different colored markers move closer to each other along the axial direction, forcing the tips of the two pens to elastically contact and press together. At this time, due to the adsorption and guiding effect of the fibers between the two pens, the ink in each pen tip permeates into the other pen tip, causing ink to mix and change color. Thus, it is possible to draw a colorful gradient of mixed colors other than those of the two pens, increasing the user's choice in the number of colors. Meanwhile, the present invention also provides a limiting post with a notch on the ink mixer. During the torque process, the two stop surfaces on the notch fit together and stop each other, thereby restricting the marker from rotating further. This ensures that the two pen tips are in elastic deformation contact with each other, but the heads of the two pen tips are not crushed due to excessive deformation, thus playing the role of axial limiting and protecting the pen tips. Attached Figure Description

[0017] Figure 1 This is a perspective view of the rotating color-changing dual-barreled dual-headed marker of the present invention;

[0018] Figure 2 This is a cross-sectional view of the rotating color-changing dual-barreled dual-headed marker of the present invention;

[0019] Figure 3 This is an exploded view of the rotating color-changing dual-barreled dual-headed marker of the present invention;

[0020] Figure 4 A perspective view of the marker pen in this invention;

[0021] Figure 5 An exploded view of the marker pen in this invention;

[0022] Figure 6 This is a cross-sectional view of the pen barrel in this invention;

[0023] Figure 7 This is a perspective view of the ink mixer in this invention;

[0024] Figure 8 This is a front view of the ink mixer in this invention;

[0025] Figure 9 For the present invention along Figure 8 A cross-sectional view along the AA direction;

[0026] Figure 10 For the present invention along Figure 8 Cross-sectional view along the BB direction;

[0027] Figure 11 For the present invention along Figure 8 A cross-sectional view along the CC direction;

[0028] Figure 12 This is a perspective view of the pen cap in this invention;

[0029] Figure 13 This is a cross-sectional perspective view of the pen cap in this invention.

[0030] Referring to the accompanying drawings, the following explanations are provided:

[0031] 1. Tail plug; 11. Third ring rib; 12. Third step; 2. Pen barrel; 21. Second ring rib; 22. Lower section; 23. Middle section; 24. Upper section; 25. Fourth ring rib; 26. Inner rib; 27. Second step; 28. Positioning rib; 3. Core wrapping; 4. Pen tip; 41. Head; 42. Fourth step; 43. Middle section; 44. Tail; 5. Ink mixer; 50. Deformation part; 51. Raised rib; 52. Notch; 521. Stop surface; 53. Fifth ring rib; 54. Chamfer; 55. First step; 56. Window; 57. Connecting tube; 58. Insert sleeve; 59. Limiting post; 6. Pen cap; 61. First ring rib. Detailed Implementation

[0032] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] The following specific embodiments describe in detail the structure of a rotary color-changing dual-barrel dual-head marker according to this application. The description will be presented in two states: holding two markers in each hand and simultaneously rotating them in opposite directions until the tips 4 of the two markers touch and mix ink; and removing the torque so that the two markers are in a normal assembly gap.

[0034] See Figures 1 to 13 The present invention provides a rotating color-changing dual-barrel dual-head marker, comprising: two markers of different colors and an ink mixer 5, wherein the ink mixer 5 is a hollow tube and has a deformable part 50 that can produce elastic deformation.

[0035] This invention relates to a rotary color-changing dual-barrel dual-head marker pen with two states: an original assembly state and an ink mixing state. In the original assembly state, the two marker pens are inserted from both ends of the ink mixer 5, with the pen tips 4 facing each other but not in contact. When a torque is applied to the two marker pens in opposite directions, causing them to rotate the two ends of the ink mixer 5 in opposite directions, the deformation part 50 is forced to twist and deform, shortening the length of the ink mixer 5. This allows the two pen tips 4 to come into contact with each other and mix ink, at which point the rotary color-changing dual-barrel dual-head marker pen is in the ink mixing state.

[0036] In the mixed ink state, the ink in each of the two marker tips 4 permeates into the other's tip 4. After a period of time, since the ink in each tip 4 is a mixture of two different colors of ink, after a few seconds of blending, the two markers can be taken out and used to draw or write mixed color gradients.

[0037] This invention, a rotating, color-changing, dual-barrel, dual-headed marker, breaks through the traditional mindset and structural methods of markers, subverting the ever-evolving combination structure of markers. It elevates the technological level and innovation capabilities in this field, greatly extending and expanding the functionality of markers. It allows for more flexible use of color in creative work, assisting painting enthusiasts in exploring the world of color. Users can effectively and freely unleash their imagination while painting, producing unexpected effects that are more realistic, richer in color, and more vibrant and saturated, ensuring creators can produce outstanding works. Furthermore, its simple and compact structure, easy assembly, and low cost make it suitable for mass production. In use, it offers convenience, practicality, naturalness, comfort, and a user-friendly experience, providing a novel and aesthetically pleasing experience.

[0038] It should be noted that the marker pen can adopt various structural forms, as long as it can be positioned in both the axial and circumferential directions after being plugged into the ink mixer 5. This article specifically uses... Figures 3 to 6 The structure of the marker pen shown will be explained in detail.

[0039] In this embodiment, both markers include a tail plug 1, a pen barrel 2, a core roll 3, and a pen tip 4.

[0040] The pen barrel 2 is a hollow, stepped cylinder with a certain wall thickness, its outer diameter gradually increasing from bottom to top. The pen barrel 2 includes a lower section 22, a middle section 23, and an upper section 24 connected sequentially from bottom to top. On the foremost surface of the lower section 22, a second annular rib 21 is formed by a small arc protruding slightly from the surface and rotating radially with a certain chord length (width). This second annular rib 21 transitions into the fifth annular rib 53 inside the ink mixer 5, serving as one of the axially positioned components of the pen barrel 2. Simultaneously, on the inner surface of the lower section 22, an inner rib 26 is formed by stretching a small arc of a certain length and width, protruding a certain height from the inner surface, in the axial direction. Several inner ribs 26 are evenly distributed along the circumference of the inner surface of the lower section 22. The inner surfaces of these inner ribs 26 are in an interference fit with the outer surface of the middle part 43 of the pen tip 4, and the specified axial fitting force is achieved. Then, the pen tip 4 is axially positioned at the front end of the pen barrel 2 by contacting the end face of the lower section 22 through the fourth step 42 of the pen tip 4 itself.

[0041] Furthermore, the middle section 23 of the pen barrel 2 is used to engage with the insertion cylinder 58 of the ink mixer 5, and the middle section 23 of the marker pen and the inner wall of the insertion cylinder 58 are provided with circumferential positioning features. In the original assembly state and the ink mixing state, the marker pen is circumferentially positioned by the circumferential positioning features to limit the relative rotation of the insertion cylinder 58 and the marker pen inserted therein in the circumferential direction. Thus, when a torque is applied to the marker pen, the insertion cylinder 58 of the ink mixer 5 can be rotated synchronously.

[0042] In this embodiment, the circumferential positioning features include a regular polygonal outer surface on the middle section 23 and a regular polygonal inner surface on the plug-in cylinder 58. That is, the middle section 23 is in the shape of a regular polygon and hollow inside. The number of sides of the regular polygonal outer surface is the same as the number of sides of the regular polygonal inner surface of the plug-in cylinder 58, which is conducive to mutual matching and torque transmission. This allows the ink mixer 5 to undergo torsional elastic deformation smoothly, forcing the two pen tips 4 to fully elastically contact each other and be in the ink mixing state, thus completing the functions of ink mixing, diffusion, and coloring.

[0043] Of course, in other embodiments of the present invention, the circumferential positioning feature may also include a protrusion on the middle section 23 and a limiting groove inside the plug tube 58. The protrusion and the limiting groove can also play a circumferential positioning role.

[0044] Furthermore, the upper section 24 is a hollow rotating body with a certain wall thickness, into which the rolled core 3 is inserted, with a clearance fit between the two. Several positioning ribs 28 are evenly distributed along the circumference on the inner step surface at the junction of the middle section 23 and the upper section 24, and one end face of the rolled core 3 contacts the positioning ribs 28. At a certain distance from its upper end face, the upper section 24 has a fourth ring rib 25 on its inner surface. The cross-section of the fourth ring rib 25 is still a closed shape formed by a small arc and a certain width, formed by rotating one revolution along the inner surface of the upper section 24. This fourth ring rib 25 has an interference fit with the third ring rib 11 of the tail plug 1; simultaneously, the third step 12 of the tail plug 1 itself contacts the upper end face of the upper section 24, forming an axial limit, thus assembling and fixing the tail plug 1 and the pen barrel 2 together, achieving the specified axial fitting force.

[0045] In this embodiment, the core 3 is cylindrical, composed of an outer skin layer and an inner fiber bundle. The inner layer contains a certain number of bundled fiber filaments, with a soft, sponge-like feel. A certain amount of micro-gaps are controlled between the fiber filaments to allow ink to be stored and absorbed within them. The outer skin layer is a thin-walled tubular body, typically made of PP material. Using a specialized molding machine, the PP raw material is fed into a barrel, heated, pressurized, and injected onto the outermost surface of the bundled fiber filaments of a certain diameter, forming a thin, film-like outer skin layer. After cooling and cutting, a single, integral core 3 is formed. The outer skin layer protects the ink from leakage and prevents it from drying out. Simultaneously, the other end face of the core 3 has a certain axial interference fit with the cylindrical end face of the tail plug 1, positioning the core 3 axially.

[0046] See Figure 5 In this embodiment, the pen tip 4 has a stepped, solid, rotating structure, integrally formed from a certain number of fiber bundles, such as nylon or polyester fibers, using specialized equipment. It has a specified surface hardness, softens after absorbing ink, and possesses a certain degree of elasticity. The pen tip 4 includes a head 41, a middle section 43, and a tail 44 connected sequentially from bottom to top, with the diameter decreasing from the head 41 to the tail 44. The head 41 and the middle section 43 of the pen tip 4 are stepped, forming a fourth step 42 between them. The fourth step 42 contacts the end face of the lower section 22 of the pen barrel 2, axially positioning it. The middle section 43 of the pen tip 4 is inserted into the lower section 22 and simultaneously has an interference fit with the inner rib 26, achieving a certain fitting force, thereby radially positioning the pen tip 4. Because there is a fourth step 42 between the outer surfaces of the head 41 and the middle part 43, which rests on the end face of the lower part 22, although there is an axial component force when the user draws, the fourth step 42 on the pen tip 4 will not retract into the pen barrel 2, thus positioning the pen tip 4 in both the axial and radial directions.

[0047] In addition, the tail 44 is inserted into the fiber bundle at one end of the core 3 and has a certain length to accommodate the ink in the fiber bundle, so that the ink can be smoothly drawn out through the pen tip 4 to the head 41 of the pen tip for use by painters and other personnel.

[0048] See Figures 7 to 11 In this embodiment, the ink mixer 5 is hollow dumbbell-shaped, with large-diameter ends and a small-diameter middle section. It is typically made of plastic and injection molded in one piece; in this embodiment, transparent PP plastic is used. The large-diameter sections at both ends of the ink mixer 5 are insertion tubes 58, each for inserting two marker pens. The small-diameter section in the middle of the ink mixer 5 is a connecting tube 57, which is fixedly connected between the two insertion tubes 58, forming two first steps 55 at the connection point. In the ink mixing state, the two pen tips 4 abut against each other inside the connecting tube 57 to mix ink.

[0049] like Figure 10 As shown, the inner surfaces of the two plug-in cylinders 58 are regular polygons, and the number of sides and dimensions are matched with the outer surface of the regular polygon on the middle section 23 of the pen barrel 2. The two are fitted with a small gap, so that both pen barrels 2 are circumferentially positioned.

[0050] It is worth mentioning that, on the wall thickness of the two plug-in cylinders 58, starting at a certain distance from the first step 55, there are multiple rectangular windows 56 with a certain length and width along the axial direction. The multiple windows 56 are evenly distributed in the circumferential direction of the plug-in cylinders 58, and the connecting ribs between two adjacent windows 56 form a deformable part 50.

[0051] Furthermore, each of the plug-in cylinders 58 located within the window 56 is provided with an axially extending limiting post 59, with its two ends connected to two corresponding inner walls of the window 56. Each limiting post 59 has a notch 52. The notch 52 can be located in the middle of the limiting post 59, dividing it into two parts, thus forming two spaced-apart opposing stop surfaces 521 at the notch 52; or the notch 52 can be located at the end of the limiting post 59, similarly forming two spaced-apart opposing stop surfaces 521 (one stop surface 521 is on the limiting post 59, and the other stop surface 521 is on an inner wall of the window 56 opposite to the limiting post 59). The two stop surfaces 521 are used to stop each other in the ink-mixed state to limit the axial movement of the marker pen.

[0052] This invention features evenly distributed windows 56 on the ink mixer 5, creating deformation portions 50 between adjacent windows 56. A limiting post 59 with a notch 52 is also provided within each window 56. Its function is as follows: when the ink mixer 5 is in an ink mixing state (i.e., under a certain torque), it can elastically deform, forcing the two pen tips 4 to contact each other. The length and width of the windows 56 and the axial height of the notch 52 can be determined through experience and practice to ensure appropriate tactile force and axial limiting of the pen tips 4, achieving the specified functional requirements. When no torque is applied, it can elastically return to its original assembly state, ensuring a certain gap between the two pen tips 4. Preferably, in the original assembly state, the gap between the two pen tips 4 is 0.7mm-1mm. Simultaneously, when the ink mixer 5 is subjected to a certain torque, its total length is shortened, causing the pen tips 4 of the two marker pens mounted on the connector 58 to contact each other, completing the ink mixing task. Furthermore, by rationally designing the axial width of the notch 52, the travel distance of the marker pen along the axial direction can be limited when ink is mixed. This ensures that the two pen tips 4 do not approach each other infinitely, but rather that there is a certain amount of elastic deformation between them. For example, if the axial width of the notch 52 is too large, under the action of torque, the travel distance of the two symmetrically distributed marker pens along the axial direction will increase, making the head 41 of the two pen tips 4 more susceptible to pressure deformation. If this deformation exceeds the range of elastic deformation, the pen tips may be damaged, affecting the drawing and writing results.

[0053] Of course, in some embodiments of the present invention, a window 56 may be provided on only one of the plug tubes 58 to form a deformable part 50, while the other plug tube 58 may not have a window 56. By reasonably designing the deformation of the deformable part 50, i.e. the extension and retraction of the ink mixer 5, the ink mixing and color changing function can also be achieved.

[0054] Furthermore, the ink mixer 5 has a fifth ring rib 53 on its inner surface near the first step 55. In the original assembled state, the fifth ring rib 53 is in transition fit with the second ring rib 21 at the front end of the pen barrel 2; at the same time, the second step 27 formed at the intersection of the middle section 23 and the upper section 24 of the pen barrel 2 is exactly abutting the end face of the ink mixer 5; in addition, the regular polygonal middle section 23 of the pen barrel 2 and the insertion tube 58 of the ink mixer 5 fit together with a small gap, which forces both markers to be positioned axially and radially.

[0055] In addition, the openings at both ends of the ink mixer 5 are designed with chamfers 54 to facilitate the insertion of markers.

[0056] See Figure 2 , Figure 12 and Figure 13The present invention also includes a pen sleeve 6, which is a hollow tube with openings at both ends, and is generally made of transparent PP plastic injection molding. The pen sleeve 6 is fitted onto the ink mixer 5. The inner wall of the pen sleeve 6 is designed with two first annular ribs 61. The first step 55 located at the end of the two plug-in cylinders 58 that are close to each other extends radially outward to protrude from the outer surface of the plug-in cylinder 58. The two first annular ribs 61 and the two first steps 55 are matched one-to-one to achieve axial positioning of the ink mixer 5 and the pen sleeve 6.

[0057] See Figure 7 Each of the two plug-in cylinders 58, located at their opposite ends, has multiple raised ribs 51 evenly distributed circumferentially on their outer surfaces. These ribs 51 are fitted with a clearance fit to the inner surface of the pen cap 6, facilitating elastic deformation of the ink mixer 5 along the axial direction when subjected to torque and reducing frictional resistance in all directions, resulting in a more comfortable feel. This invention, by providing the pen cap 6, enhances the aesthetics of the rotary color-changing double-barreled double-ended marker and also guides the elastic deformation of the ink mixer 5 along the axial direction.

[0058] The working principle of the rotating color-changing dual-barrel dual-head marker of this invention is as follows.

[0059] When the rotary color-changing dual-barrel dual-head marker is in its original assembly state and is being used or remixed, hold the two different colored pen barrels 2 firmly with both hands and rotate them in opposite directions (one clockwise and one counterclockwise) by a certain angle. Under the action of torque, the deformation part 50 of the ink mixer 5 is twisted and elastically deformed along the axial direction, shortening the length of the ink mixer 5. The two different colored markers move closer to each other along the axial direction, forcing the heads 41 of the two pen tips 4 to elastically contact and press together. At this time, because the fibers between the two pen tips 4 have the function of adsorbing and guiding ink, it can be observed from the transparent window of the ink mixer 5 and the pen cap 6 that the ink in each pen tip 4 permeates into the other pen tip 4. After a period of mixing, since the ink in each pen tip 4 is formed by the mixing and diffusion of two inks, after a few seconds of diffusion, the torque is removed, and the two markers are taken out and used separately to draw or write mixed gradient colors, making the picture more colorful and visually appealing.

[0060] At this time, during the torque process, due to the torsional elastic deformation of the deformed part 50, the axial width of the window 56 is shortened. The two sections of the limiting post 59 on both sides of the notch 52 slowly approach each other until the two stop surfaces 521 are attached together and stop each other, thereby restricting the marker from rotating further. This ensures that the two pen tips 4 are in elastic deformation contact with each other, and that the heads 41 of the two pen tips 4 are not crushed due to excessive deformation, thus playing the role of axial limiting and protecting the pen tips 4.

[0061] The rotating color-changing dual-barrel dual-head marker switches from a state of seamless ink mixing to its original assembly state with gaps, i.e., after mixing four colors with the two tips, the marker can be removed and used for drawing or other purposes.

[0062] When the external torque is removed, the ink mixer 5 has no torque effect, and the deformed part 50 returns to its original assembly state under its own elastic force. The two pen tips 4 retract with the pen barrel 2 until they return to the original assembly state when the ink mixing state with gap is switched from the gapless ink mixing state to the gap, thus completing one working cycle.

[0063] By repeatedly applying and removing torque to the two pen barrels 2 simultaneously, the above-mentioned movements continuously complete the two movements of elastic contact between the two pen tips 4 with and without gaps along the axial direction, thus satisfying the functional requirements of the rotating color-changing double-barreled double-headed marker of the invention application. That is, it completes the cycle of re-mixing colors after the ink in each of the two pen tips 4 has been used up.

[0064] Therefore, the present invention, a rotating color-changing dual-barrel dual-head marker, innovates the structure of traditional markers by setting up two markers of different colors and an ink mixer 5. The ink mixer 5 has a deformation part 50. When the two different colored markers are held by both hands and rotated in opposite directions by a certain angle, the deformation part 50 is twisted and elastically deformed along the axial direction under the action of torque, which shortens the length of the ink mixer 5. The two different colored markers move closer to each other along the axial direction, forcing the heads 41 of the two pen tips 4 to elastically contact and press together. At this time, because the fibers between the two pen tips 4 have the function of adsorbing and guiding ink, the ink in each pen tip 4 permeates into the other pen tip 4, and the ink mixes and changes color. Thus, it is possible to draw a colorful gradient of mixed colors other than those of two pens, increasing the user's choice of colors. Meanwhile, the present invention also provides a limiting post 59 with a notch 52 on the ink mixer 5. During the torque operation, the two stop surfaces 521 located on the notch 52 fit together and stop each other, thereby restricting the marker from rotating further. This ensures that the two pen tips 4 are in elastic deformation contact with each other, and that the heads 41 of the two pen tips 4 are not crushed due to excessive deformation, thus playing the role of axial limiting and protecting the pen tips 4.

[0065] Compared with existing technologies, this invention breaks through the traditional pattern, mindset, and structure of markers, subverting the structural design of markers in the stationery industry, enhancing the industry's technological level and innovation capabilities, adding a novel feel to marker mechanisms, and providing a forward-looking and aesthetically pleasing experience. It boasts advantages such as reasonable design, compact structure, novel and unique concept, easy processing and low cost, and convenient mass production. In particular, it greatly enhances the ability of drawing enthusiasts to meet their needs for a wider range of colors and hues.

[0066] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A rotating, color-changing, dual-barrel, dual-headed marker, characterized in that, include: Two markers of different colors and an ink mixer (5). The ink mixer (5) is a hollow tube with a deformable part (50) that can produce elastic deformation. The rotating color-changing double-barreled double-headed marker has two states: the original assembly state and the ink mixing state. In the original assembly state, the two markers are inserted from both ends of the ink mixer (5) and the tips (4) of the two markers are opposite to each other and do not touch each other. When a torque is applied to the two markers in opposite directions, so that the two markers drive the two ends of the ink mixer (5) to rotate in opposite directions, the deformable part (50) can be forced to twist and deform, so as to shorten the length of the ink mixer (5) and make the two tips (4) come into contact with each other to mix ink. At this time, the rotating color-changing double-barreled double-headed marker is in the ink mixing state.

2. The rotary color-changing dual-barreled dual-headed marker according to claim 1, characterized in that: Both ends of the ink mixer (5) are provided with insert tubes (58) for inserting the marker pen, and at least one of the insert tubes (58) has multiple windows (56) opened along the circumferential direction, and the connecting rib between two adjacent windows (56) forms the deformable part (50).

3. The rotary color-changing dual-barreled dual-headed marker according to claim 2, characterized in that: Each of the plug tubes (58) located inside the window (56) is provided with a limiting post (59) extending along the axial direction. Each limiting post (59) is provided with a notch (52), and two opposing stop surfaces (521) are formed at the notch (52). The two stop surfaces (521) are used to stop each other in the ink mixing state to limit the stroke of the marker pen along the axial direction.

4. The rotating color-changing dual-barreled dual-headed marker according to claim 2, characterized in that: The marker pen and the inner wall of the insert tube (58) are provided with circumferential positioning features. In the original assembly state and the ink mixing state, the marker pen is circumferentially positioned by the circumferential positioning features to limit the relative rotation of the insert tube (58) and the marker pen inserted therein in the circumferential direction.

5. The rotary color-changing dual-barreled dual-headed marker according to claim 2, characterized in that: The ink mixer (5) is provided with a connecting tube (57) in the middle. The connecting tube (57) is fixedly connected between the two plug tubes (58). In the ink mixing state, the two pen tips (4) abut against each other in the connecting tube (57) to mix ink.

6. The rotary color-changing dual-barreled dual-headed marker according to claim 2, characterized in that: It also includes a pen cap (6), which is tubular and is fitted onto the ink mixer (5); each of the two plug tubes (58) has an annular first step (55) at one end that is close to each other, and the inner surface of the pen cap (6) has a first ring rib (61), and the first step (55) and the first ring rib (61) are transitionally fitted to achieve axial positioning of the ink mixer (5) and the pen cap (6).

7. The rotary color-changing dual-barreled dual-headed marker according to claim 6, characterized in that: Each of the two plug tubes (58) is provided with a plurality of raised ribs (51) evenly distributed circumferentially on its outer surface at the other ends of the two plug tubes (58), and the plurality of raised ribs (51) are all in clearance fit with the inner surface of the pen cap (6).

8. The rotary color-changing dual-barreled dual-headed marker according to claim 1, characterized in that: Both markers include a tail plug (1), a barrel (2), a core (3), and a tip (4). The barrel (2) is a hollow, stepped cylinder with a certain wall thickness. The core (3) is built into the barrel (2). The tip (4) is installed at one end of the barrel (2) and inserted into the core (3). The tail plug (1) is installed at the other end of the barrel (2) and presses against the core (3). The barrel (2) has a second step (27). In the original assembly state, the second step (27) abuts against the end face of the ink mixer (5).

9. The rotary color-changing dual-barreled dual-headed marker according to claim 1, characterized in that: The ink mixer (5) is made of plastic material through injection molding; the pen tip (4) is made of fiber material through processing.

10. The rotary color-changing dual-barreled dual-headed marker according to claim 1, characterized in that: In the original assembled state, the distance between the two pen tips (4) is 0.7mm-1mm.

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