A fun writing tool
By combining the extension and retraction of the pen refill with the opening and closing of the decorative parts, the problem of weak interactivity in existing fun writing tools is solved. The synchronous movement of the decorative parts and the pen refill is achieved, enhancing the fun and stress-relieving effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELI GROUP CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-06-30
AI Technical Summary
The flower-shaped decorative elements added to existing fun writing tools are static, lack interactivity, and are not effective in increasing fun and relieving stress.
A fun writing tool was designed, in which the extension and retraction of the pen lead is combined with the opening and closing of the decorative parts. The pushing part of the operating part drives the rotating part to rotate, which in turn links the upper and lower guide parts to realize the extension and retraction of the pen lead. At the same time, the opening and closing of the decorative parts creates an interactive effect.
It achieves synchronized movement between the decorative parts and the pen refill, enhancing visual interactivity and stress relief, as well as increasing fun and practicality.
Smart Images
Figure CN224426940U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of writing instrument technology, specifically to a fun writing instrument. Background Technology
[0002] A new type of fun writing tool has emerged, which enhances its aesthetic appeal and entertainment value by adding decorative elements to the end of the pen. For example, Chinese utility model patent CN201240163Y discloses a fun writing tool... Figure 1 As shown, it includes a pen barrel 1a and a pen refill 2a, with a simulated flower 3a inserted at the end of the pen barrel 1a. This fun writing instrument can not only be used for writing, but also has a decorative and aesthetically pleasing effect.
[0003] However, existing fun writing tools still have the following technical problems: the added flower-shaped decorative parts are static, lack interactivity, and have poor effects on increasing fun and relieving stress. Therefore, we urgently need to design a fun writing tool that interacts with the extension and retraction of the pen refill 2a and has a better effect on increasing fun and relieving stress. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide a fun writing tool that interacts with the extension and retraction of the pen refill, and has a better effect on increasing fun and relieving stress.
[0005] The technical solution of this utility model is: a fun writing tool, including a pen barrel and a pen refill, wherein the pen refill is axially movable within the pen barrel via a first elastic element, and further includes...
[0006] An operating component includes a rotating part and a pushing part disposed on one side of the rotating part. The rotating part is rotatably mounted inside the pen barrel and located above the pen core. The pushing part extends out of the pen barrel and can be pushed to a first position or a second position.
[0007] A decorative element is axially movably mounted on the end of the pen barrel and has an open state and a closed state. The decorative element is open when it extends out of the end of the pen barrel and closed when it retracts into the end of the pen barrel.
[0008] An upper guide member is axially movably installed inside the pen barrel and located between the rotating part and the decorative part. The upper guide member is linked to the rotating part and the decorative part is linked to the upper guide member.
[0009] A lower guide member is axially movably installed inside the pen barrel and located between the rotating part and the pen refill. The lower guide member is linked to the rotating part and the pen refill is linked to the lower guide member.
[0010] When the pushing part of the operating member is pushed to switch between the first position and the second position, the axial movement of the lower guide member causes the pen tip to extend or retract from the pen barrel, while the axial movement of the upper guide member causes the decorative member to switch between the open state and the closed state.
[0011] The working principle of this novel fun writing tool is as follows:
[0012] Assuming the initial state is non-writing, the pushing part of the operating component is in the second position, the pen tip retracts into the pen barrel, and the decorative part retracts into the pen barrel's tail, thus being in a closed state. When writing is required, the pushing part is pushed to switch to the first position. During this process, the pushing part drives the rotating part to rotate, which in turn drives the lower guide to move axially downward. The downward movement of the lower guide causes the pen tip to move axially downward, causing the pen tip to extend out of the pen barrel. At the same time, the rotation of the rotating part also drives the upper guide to move axially upward, which in turn drives the decorative part to move axially upward, causing the decorative part to extend out of the pen barrel's tail. At this point, the decorative part switches to the open state.
[0013] With the above structure, this utility model has the following advantages:
[0014] This utility model of a fun writing tool features a decorative element that can be opened and closed, combined with the extension and retraction of the pen refill. When the pusher is pushed, not only does the pen refill extend and retract to switch between writing and non-writing states, but the decorative element also opens and closes simultaneously. Therefore, the decorative element interacts well with the extension and retraction of the pen refill during use, achieving a simultaneous presentation of visual and functional effects, thus enhancing the fun and stress relief.
[0015] Preferably, the decorative element includes a stamen portion and petals disposed outside the stamen portion. The lower ends of both the stamen portion and the petals are fixed to the top of the upper guide member, and the upper end of the petals is an openable / closable structure. This design allows the decorative element to be shaped like a flower, simulating both the budding and open states of a flower, resulting in a vivid and engaging effect with excellent stress-relieving properties.
[0016] Preferably, the pushing part includes a rod and a push button. One end of the rod is fixedly connected to one side of the rotating part, and the other end is fixedly connected to the push button outside the pen barrel. The pen barrel is provided with a sliding groove that slides with the rod. This arrangement not only facilitates the use of the push button on the outside of the pen barrel to push the rotating part to rotate, but also utilizes the cooperation between the rod and the sliding groove to provide guidance, making the rotation of the rotating part more stable and reliable.
[0017] Preferably, the outer side of the rotating part is provided with a first spiral protrusion, and the upper guide member is hollow inside with a first slider on its inner side. The upper guide member is sleeved on the outside of the rotating part, and the first slider is slidably engaged with the first spiral protrusion. When the rotating part rotates, the first slider moves radially relative to the first spiral protrusion and also moves axially, thereby converting the rotational motion of the rotating part into the axial motion of the upper guide member. This arrangement utilizes the characteristic that the first spiral protrusion has both radial and axial displacement, smoothly converting the rotational motion of the rotating part into the axial motion of the upper guide member.
[0018] Preferably, a second elastic element is provided between the upper guide and the end of the pen barrel. The second elastic element provides a force to press the first slider against the first spiral protrusion. This arrangement allows the first slider of the upper guide to fit tightly with the first spiral protrusion of the rotating part, thereby making the linkage between the upper guide and the rotating part more reliable.
[0019] Preferably, a first stop and a second stop are respectively provided at the beginning and end of the first spiral protrusion. This arrangement is used to limit the extreme position of the first slider on the first spiral protrusion, making the axial movement of the upper guide more reliable.
[0020] Preferably, the first stop and the second stop are symmetrically arranged on the rotating part, and the first spiral protrusion is provided on both the left and right sides of the rotating part, between the first stop and the second stop. The number and position of the first slider match the number and position of the first spiral protrusion. This arrangement ensures that both sides of the upper guide are guided, thereby more stably and reliably converting the rotational motion of the rotating part into the axial motion of the upper guide.
[0021] Preferably, the first spiral protrusion is further provided with a first positioning groove for positioning the decorative element in the open state. This feature ensures that the decorative element is reliably positioned in the open state after the push part is operated.
[0022] Preferably, the rotating part is hollow inside and has a second spiral protrusion on its inner side. A second slider is provided on the outer side of the lower guide member. The rotating part is sleeved on the lower guide member, and the second slider slides on the second spiral protrusion. When the rotating part rotates, the second slider moves radially relative to the second spiral protrusion while also undergoing axial movement, thereby converting the rotational motion of the rotating part into the axial motion of the lower guide member. This design utilizes the characteristic that the second spiral protrusion has both radial and axial displacement, smoothly converting the rotational motion of the rotating part into the axial motion of the lower guide member.
[0023] Preferably, the pen barrel has a tail plug at its end, and a guide sleeve is coaxially disposed within the tail plug. The decorative element extends or retracts from the tail plug through the guide sleeve. An annular groove is formed between the outer side of the guide sleeve and the inner side of the tail plug, and the second elastic element is installed within the annular groove. This arrangement not only utilizes the tail plug to form a guide sleeve to guide the axial movement of the decorative element, but also utilizes the annular groove formed by the tail plug to install the second elastic element, resulting in a clever and compact structural design. Attached Figure Description
[0024] Figure 1 A structural diagram of an existing fun writing tool;
[0025] Figure 2 This is a schematic diagram of the structure of the novel fun writing tool in a non-writing state;
[0026] Figure 3 This is a schematic diagram of the structure of the novel fun writing tool in the writing state;
[0027] Figure 4 This is an axial sectional view of the novel fun writing tool in a non-writing state.
[0028] Figure 5 This is an axial sectional view of the novel fun writing tool in writing mode;
[0029] Figure 6 An exploded view of the novel fun writing tool;
[0030] Figure 7 This is a structural schematic diagram of the operating component, upper guide component, lower guide component, and decorative component of this utility model.
[0031] Figure 8 This is a schematic diagram of the structure of the upper pen barrel of this utility model;
[0032] Figure 9 This is a schematic diagram of the structure of the operating component of this utility model;
[0033] Figure 10 This is another structural schematic diagram of the operating component of this utility model;
[0034] Figure 11 This is a schematic diagram of the structure of the upper guide member of this utility model;
[0035] Figure 12 This is a schematic diagram of the structure of the lower guide component of this utility model;
[0036] In the existing technical diagram: 1a - pen barrel, 2a - pen refill, 3a - artificial flower;
[0037] In the figures of this utility model: 1-pen barrel, 2-pen core, 3-first elastic element, 4-operating element, 5-rotating part, 6-pushing part, 7-decorative part, 8-upper guide element, 9-lower guide element, 10-flower stamen part, 11-petal part, 12-bar body, 13-push button, 14-slide groove, 15-first spiral protrusion, 16-first slider, 17-second elastic element, 18-first stop part, 19-second stop part, 20-first positioning groove, 21-second spiral protrusion, 22-second slider, 23 - Tail plug, 24- Guide sleeve, 25- Annular groove, 26- Third stop, 27- Fourth stop, 28- Second positioning groove, 29- First guide block, 30- First guide groove, 31- Second guide block, 32- Second guide groove, 33- Isolation part, 34- Embedding groove, 35- Snap-fit structure, 36- Insertion part, 37- First limiting step, 38- Second limiting step, 39- Upper pen barrel, 40- Lower pen barrel, 41- Limiting component, 42- Third limiting step, 43- Fourth limiting step. Detailed Implementation
[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example
[0039] like Figure 2-12 As shown, a fun writing instrument includes a pen barrel 1 and a pen refill 2. The pen refill 2 is axially movable within the pen barrel 1 via a first elastic member 3. It also includes...
[0040] The operating component 4 includes a rotating part 5 and a pushing part 6 disposed on one side of the rotating part 5. The rotating part 5 is rotatably mounted inside the pen barrel 1 and located above the pen core 2. The pushing part 6 extends out of the pen barrel 1 and can be pushed to a first position or a second position.
[0041] Decorative part 7 is axially movably mounted on the end of the pen barrel 1 and has an open state and a closed state. Decorative part 7 is open when it extends out of the end of the pen barrel 1 and closed when it retracts into the end of the pen barrel 1.
[0042] The upper guide 8 is axially movably installed inside the pen barrel 1 and located between the rotating part 5 and the decorative part 7. The upper guide 8 is linked to the rotating part 5 and the decorative part 7 is linked to the upper guide 8.
[0043] The lower guide 9 is axially movably installed inside the pen barrel 1 and located between the rotating part 5 and the pen core 2. The lower guide 9 is linked to the rotating part 5 and the pen core 2 is linked to the lower guide 9.
[0044] When the pusher 6 of the pusher 4 switches between the first position and the second position, the lower guide 9 moves axially to extend or retract the pen tip of the pen barrel 1, while the upper guide 8 moves axially to switch the decorative part 7 between the open and closed states.
[0045] In this embodiment, the fun writing tool features a decorative element 7 that can be opened and closed, which is combined with the extension and retraction of the pen refill 2. That is, when the push part 6 is pushed, not only can the pen refill 2 be extended and retracted to switch between writing and non-writing states, but the opening and closing action of the decorative element 7 is also realized at the same time. Therefore, the decorative element 7 can interact well with the extension and retraction of the pen refill 2 during use, achieving the effect of simultaneous presentation of visual and functional aspects, and providing a better effect of increasing fun and relieving stress.
[0046] Decorative component 7 includes a stamen portion 10 and petal portions 11 disposed outside the stamen portion 10. The lower ends of the stamen portion 10 and the lower ends of the petal portions 11 are both fixed to the top of the upper guide component 8, and the upper end of the petal portions 11 has an openable and closable structure. This design allows the decorative component 7 to be shaped like a flower, simulating both the budding and open states of a flower, making it vivid and providing excellent fun and stress relief.
[0047] The pushing part 6 includes a rod 12 and a push button 13. One end of the rod 12 is fixedly connected to one side of the rotating part 5, and the other end is fixedly connected to the push button 13 outside the pen barrel 1. The pen barrel 1 is provided with a groove 14 that slides with the rod 12. In this embodiment, the width of the push button 13 is set to be greater than the width of the groove 14 so that the push button 13 is limited outside the pen barrel 1. This setting not only facilitates the use of the push button 13 outside the pen barrel 1 to push the rotating part 5 to rotate, but also uses the cooperation between the rod 12 and the groove 14 to provide guidance, making the rotation of the rotating part 5 more stable and reliable.
[0048] The rotating part 5 has a first spiral protrusion 15 on its outer side. The upper guide member 8 is hollow inside and has a first slider 16 on its inner side. The upper guide member 8 is sleeved on the rotating part 5, and the first slider 16 is slidably engaged with the first spiral protrusion 15. When the rotating part 5 rotates, the first slider 16 moves radially relative to the first spiral protrusion 15 and also moves axially, thereby converting the rotational motion of the rotating part 5 into the axial motion of the upper guide member 8. This arrangement utilizes the characteristic that the first spiral protrusion 15 has both radial and axial displacement to smoothly convert the rotational motion of the rotating part 5 into the axial motion of the upper guide member 8.
[0049] A second elastic element 17 is also provided between the upper guide member 8 and the end of the pen barrel 1. The second elastic element 17 provides a pressing force on the first slider 16 to press against the first spiral protrusion 15. This arrangement allows the first slider 16 of the upper guide member 8 to fit tightly with the first spiral protrusion 15 of the rotating part 5, thereby making the linkage between the upper guide member 8 and the rotating part 5 more reliable.
[0050] The first spiral protrusion 15 has a first stop portion 18 and a second stop portion 19 at its two ends. This arrangement is used to limit the extreme position of the first slider 16 on the first spiral protrusion 15, making the axial movement of the upper guide member 8 more reliable.
[0051] The first stop portion 18 and the second stop portion 19 are symmetrically arranged on the rotating portion 5. First spiral protrusions 15 are provided on both sides of the rotating portion 5, between the first stop portion 18 and the second stop portion 19. The number and position of the first sliders 16 match the number and position of the first spiral protrusions 15. This arrangement ensures that both sides of the upper guide member 8 are guided, thereby more stably and reliably converting the rotational motion of the rotating portion 5 into the axial motion of the upper guide member 8.
[0052] The first spiral protrusion 15 is also provided with a first positioning groove 20 for positioning the decorative piece 7 in the open state. This setting allows the decorative piece 7 to be reliably positioned in the open state after the push part 6 is operated.
[0053] The rotating part 5 is hollow inside and has a second spiral protrusion 21 on its inner side. A second slider 22 is provided on the outer side of the lower guide member 9. The rotating part 5 is sleeved on the lower guide member 9, and the second slider 22 slides on the second spiral protrusion 21. When the rotating part 5 rotates, the second slider 22 moves radially relative to the second spiral protrusion 21 while also undergoing axial movement, thus converting the rotational motion of the rotating part 5 into the axial motion of the lower guide member 9. This design utilizes the characteristic that the second spiral protrusion 21 has both radial and axial displacement, smoothly converting the rotational motion of the rotating part 5 into the axial motion of the lower guide member 9.
[0054] The first and last ends of the second spiral protrusion 21 are respectively provided with a third stop 26 and a fourth stop 27. This arrangement is used to limit the extreme position of the movement of the second slider 22 on the second spiral protrusion 21, so as to make the axial movement of the lower guide member 9 more reliable.
[0055] The third stop portion 26 and the fourth stop portion 27 are symmetrically arranged on the rotating portion 5. A second spiral protrusion 21 is provided on both sides of the rotating portion 5, between the third stop portion 26 and the fourth stop portion 27. The number and position of the second sliders 22 match the number and position of the second spiral protrusions 21. This arrangement ensures that both sides of the lower guide member 9 are guided, thereby more stably and reliably converting the rotational motion of the rotating portion 5 into the axial motion of the lower guide member 9.
[0056] The second spiral protrusion 21 is also provided with a second positioning groove 28 for positioning the pen refill 2 in the extended position. This setting allows the pen refill 2 to be reliably positioned in the extended position after the push part 6 is operated.
[0057] The pen barrel 1 has a tail plug 23 at its end, and a guide sleeve 24 is coaxially arranged inside the tail plug 23. The decorative part 7 extends out of or retracts from the tail plug 23 through the guide sleeve 24. An annular groove 25 is also formed between the outer side of the guide sleeve 24 and the inner side of the tail plug 23, and the second elastic element 17 is installed in the annular groove 25. This arrangement not only uses the tail plug 23 to form a guide sleeve 24 to guide the axial movement of the decorative part 7, but also uses the annular groove 25 formed by the tail plug 23 to install the second elastic element 17. The structural design is ingenious and compact.
[0058] The upper guide member 8 has a first guide block 29 on its outer side and a first guide groove 30 on its inner side axially. The upper guide member 8 is axially and movably installed in the pen barrel 1 through the first guide block 29 and the first guide groove 30. The guiding structure of the upper guide member 8 is simple and compact, and its axial movement is reliable.
[0059] The lower guide member 9 has a second guide block 31 on its outer side and a second guide groove 32 axially on its inner side. The lower guide member 9 is axially and movably installed inside the pen barrel 1 via the second guide block 31 and the second guide groove 32. The guiding structure of the lower guide member 9 is simple and compact, and its axial movement is reliable.
[0060] In this embodiment, the slide groove 14 is a square through groove extending from the left side to the right side of the pen barrel 1, and the push button 13 is flower-shaped; the first spiral protrusion 15 is provided on the upper part of the rotating part 5, and the second spiral protrusion 21 is provided on the lower part of the rotating part 5; an isolation part 33 is provided inside the rotating part 5 in the middle section, and the end of the rod 12 away from the push button 13 is inserted into the isolation part 33 of the rotating part 5 from the outside to the inside; the first positioning groove 20 and the second positioning groove 28 are both V-shaped, and the first slider 16 and the second slider 22 are vertical strips with the bottom shape matching the first positioning groove 20 and the second positioning groove 28. The shapes match; the stamen part 10 is fixed to the top end face of the upper guide member 8 via the embedding groove 34, and the petal part 11 is fixed to the outer side wall of the top of the upper guide member 8 via the snap-fit structure 35; the snap-fit structure 35 is provided on the upper part of the upper guide member 8, the first guide block 29 is provided in the middle of the upper guide member 8, the first slider 16 is provided in the lower part of the upper guide member 8, the second slider 22 is provided in the upper part of the lower guide member 9, and the second guide block 31 is provided in the lower part of the lower guide member 9; the pen tail of the pen barrel 1 has an insertion part 36, and the wall thickness of the insertion part 36 is thinned relative to the wall thickness at other positions of the pen barrel 1 to form a first limit. The first limiting step 37 of the pen barrel 1 is inserted into the annular groove 25 of the tail plug 23. The second elastic member 17 is sandwiched between the outer side of the guide sleeve 24 and the inner side of the insertion part 36. At the same time, the bottom of the tail plug 23 abuts against the first limiting step 37 of the pen barrel 1. The lower guide member 9 is hollow inside and has a second limiting step 38 in the middle. The top of the pen core 2 is installed in the lower guide member 9 and abuts against the second limiting step 38. The pen barrel 1 includes an upper pen barrel 39 and a lower pen barrel 40. The operating member 4, the upper guide member 8, the lower guide member 9, the decorative member 7, and the second elastic member 17 are all installed on the upper pen barrel 39. The pen refill 2 and the first elastic element 3 are installed on the lower pen barrel 40. The first guide groove 30 and the second guide groove 32 are both provided in the upper pen barrel 39. A limiting element 41 is also provided in the upper pen barrel 39 and between the rotating part 5 and the lower guide element 9. The limiting element 41 is detachably fixed in the upper pen barrel 39 and abuts against the bottom of the rotating part 5. A third limiting step 42 is also provided in the upper pen barrel 39 and above the limiting element 41. A fourth limiting step 43 is provided on the rotating part 5 and abuts against the third limiting step 42. The rotating part 5 is axially limited in the upper pen barrel 39 by the third limiting step 42 and the limiting element 41.
[0061] The installation process of the fun writing tool in this embodiment is as follows:
[0062] (1) The rotating part 5 and the limiting part 41 are assembled in the upper pen barrel 39 and the pushing part 6 is installed on the rotating part 5 to form the process 1 assembly;
[0063] (2) Assemble the process 1 component with the upper guide 8, the second elastic component 17, the stamen part 10, the petal part 11 and the tail plug 23 to form the process 2 component;
[0064] (3) Assemble the components of process 2 together with the lower guide 9, the pen core 2, the first elastic component 3 and the lower pen barrel 40 to complete the assembly of the entire pen.
[0065] The working principle of this fun writing tool in this embodiment is as follows:
[0066] Assuming the initial state is a non-writing state, the pushing part 6 of the operating part 4 is in the second position, the pen tip 2 retracts into the pen barrel 1, and the decorative part 7 retracts into the pen tail of the pen barrel 1. The petal part 11 wraps around the stamen part 10 and is in a closed state. When writing is required, the pushing part 6 is pushed to switch to the first position. During this process, the pushing part 6 drives the rotating part 5 to rotate. The rotation of the rotating part 5 drives the lower guide 9 to move axially downward. The downward movement of the lower guide 9 drives the pen tip 2 to move axially downward, causing the pen tip 2 to extend out of the pen barrel 1. At the same time, the rotation of the rotating part 5 also drives the upper guide 8 to move axially upward. The upward movement of the upper guide 8 drives the decorative part 7 to move axially upward, causing the decorative part 7 to extend out of the pen tail of the pen barrel 1. At this time, the petal part 11 is in an open state, exposing the stamen part 10.
Claims
1. A fun writing instrument, comprising a pen barrel (1) and a pen refill (2), wherein the pen refill (2) is axially movable within the pen barrel (1) via a first elastic element (3), characterized in that: Also includes The operating component (4) includes a rotating part (5) and a pushing part (6) disposed on one side of the rotating part (5). The rotating part (5) is rotatably mounted inside the pen barrel (1) and located above the pen core (2). The pushing part (6) extends out of the pen barrel (1) and can be pushed to a first position or a second position. Decorative part (7), which is axially movable at the end of the pen (1) and has an open state and a closed state, the decorative part (7) is open when it extends out of the end of the pen (1) and closed when it retracts into the end of the pen (1); The upper guide (8) is axially movably installed inside the pen barrel (1) and located between the rotating part (5) and the decorative part (7). The upper guide (8) is linked to the rotating part (5) and the decorative part (7) is linked to the upper guide (8). The lower guide (9) is axially movably installed inside the pen barrel (1) and located between the rotating part (5) and the pen core (2). The lower guide (9) is linked to the rotating part (5) and the pen core (2) is linked to the lower guide (9). When the pusher (6) of the operating member (4) is pushed to switch between the first position and the second position, the lower guide (9) moves axially to drive the pen tip (2) to extend or retract from the pen barrel (1), and at the same time the upper guide (8) moves axially to drive the decorative member (7) to switch between the open state and the closed state.
2. The fun writing tool according to claim 1, characterized in that: The decorative part (7) includes a stamen part (10) and a petal part (11) disposed outside the stamen part (10). The lower end of the stamen part (10) and the lower end of the petal part (11) are both fixed to the top of the upper guide (8). The upper end of the petal part (11) is an openable structure.
3. The fun writing tool according to claim 1, characterized in that: The pushing part (6) includes a rod (12) and a push button (13). One end of the rod (12) is fixed to one side of the rotating part (5) and the other end is fixed to the push button (13) outside the pen (1). The pen (1) is provided with a sliding groove (14) that slides with the rod (12).
4. The fun writing tool according to claim 1, characterized in that: The outer side of the rotating part (5) is provided with a first spiral protrusion (15). The upper guide (8) is hollow inside and has a first slider (16) on its inner side. The upper guide (8) is sleeved on the outside of the rotating part (5) and the first slider (16) slides on the first spiral protrusion (15). When the rotating part (5) rotates, the first slider (16) moves radially relative to the first spiral protrusion (15) and also moves axially, thereby converting the rotational motion of the rotating part (5) into the axial motion of the upper guide (8).
5. The fun writing tool according to claim 4, characterized in that: A second elastic element (17) is provided between the upper guide (8) and the end of the pen (1), and the second elastic element (17) provides a force to the first slider (16) to press the first spiral protrusion (15).
6. The fun writing tool according to claim 4, characterized in that: The first spiral protrusion (15) has a first stop (18) and a second stop (19) respectively at its two ends.
7. The fun writing tool according to claim 6, characterized in that: The first stop (18) and the second stop (19) are symmetrically arranged on the rotating part (5). The first spiral protrusion (15) is provided on both sides of the rotating part (5) and between the first stop (18) and the second stop (19). The number and position of the first slider (16) match the number and position of the first spiral protrusion (15).
8. The fun writing tool according to claim 4, characterized in that: The first spiral protrusion (15) is also provided with a first positioning groove (20) for positioning the decorative piece (7) in the open state.
9. The fun writing tool according to claim 1, characterized in that: The rotating part (5) is hollow inside and has a second spiral protrusion (21) on the inner side. The lower guide (9) has a second slider (22) on the outer side. The rotating part (5) is sleeved on the lower guide (9) and the second slider (22) slides on the second spiral protrusion (21). When the rotating part (5) rotates, the second slider (22) moves radially relative to the second spiral protrusion (21) and also moves axially, thereby converting the rotational motion of the rotating part (5) into the axial motion of the lower guide (9).
10. A fun writing tool according to claim 5, characterized in that: The pen barrel (1) has a tail plug (23) at its end. A guide sleeve (24) is coaxially arranged inside the tail plug (23). The decorative piece (7) extends out of or retracts from the tail plug (23) through the guide sleeve (24). An annular groove (25) is also formed between the outer side of the guide sleeve (24) and the inner side of the tail plug (23). The second elastic member (17) is installed in the annular groove (25).