A ball-point pen structure with gravity switching refill
Patent Information
- Application Number
- CN202620058407.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2036-01-16
AI Technical Summary
目前市场上也不乏一些具有多色笔芯的圆珠笔结构，普遍都采用从笔杆侧面分别通过推杆推动对应的笔芯滑动从而达到选择不同颜色的目的，其中每个笔芯都需要由对应的推杆来驱动，故造成圆珠笔的零部件数量剧增，并且为了便于操作，推杆需要突出于笔杆表面，同时笔杆上还要开设对应的凹槽，不仅增加了加工难度，而且不利于圆珠笔的观瞻效果，而零部件数量多可能增加机械故障的风险，极容易导致笔芯被卡死
[0015]本实用新型采用上述结构后，具有的有益效果：由于采用了笔芯驱动件控制随重力方向摆动的顶针来选择不同颜色笔芯的结构，因而相比于市场上已有的结构，其极大地减少了零部件的数量，且不需要在圆珠笔的表面凸出推杆或通过加粗圆珠笔的直径来容纳更多部件，具有结构简单、零部件数量少且操作更方便，有效地提高了圆珠笔使用的稳定性和观瞻性，符合工业化放大生产的要求。
Smart Images
Figure CN224881610U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of stationery products, specifically relating to a ballpoint pen structure with a gravity-switching refill. Background Technology
[0002] Ballpoint pens are a common stationery item in daily life, typically available in various colors such as black, red, blue, and green. Normally, each ballpoint pen can only be used with one color. When different colors are needed for marking or writing, multiple pens of different colors usually need to be prepared in advance. Currently, there are also ballpoint pens on the market with multi-colored refills. These generally use a push rod on the side of the pen barrel to slide the corresponding refill, thus selecting different colors. Each refill requires a corresponding push rod, resulting in a significant increase in the number of parts in a ballpoint pen. Furthermore, for ease of operation, the push rod needs to protrude from the pen barrel surface, and corresponding grooves need to be cut into the barrel. This not only increases the manufacturing difficulty but also negatively impacts the pen's appearance. The large number of parts also increases the risk of mechanical failure, making it very easy for the refill to jam. Some ballpoint pens use a multi-color refill design, where different colors of refill are selected by rotating a cap. This also requires a series of components to fix and rotate the cap, allowing it to select the refill. This design is also prone to mechanical failure, causing the refill to jam. Some products even use multiple caps for different colored refills. As is well known, the diameter of a ballpoint pen is limited; too thick a cap would be inconvenient for writing. The caps are installed at the end of the pen barrel to press the refill out of the tip. Multiple caps mean that the diameter of the caps needs to be smaller to install. The more caps there are, the smaller the diameter becomes, and the more difficult it is to install, making it extremely inconvenient for users to select different colored refills when pressing.
[0003] In view of the aforementioned problems, it is necessary to design a ballpoint pen structure that is simple in structure, low in cost, and capable of selecting different pen leads by gravity and ejecting the corresponding leads by pressing the cap. To this end, the applicant has ingeniously designed this technical solution. Utility Model Content
[0004] The objective of this invention is to provide a ballpoint pen structure with gravity-controlled refill switching, which helps to improve the refill drive structure so that the ballpoint pen can select different colored refills simply by adjusting the direction of gravity. This simplifies the ballpoint pen structure, reduces the number of parts, maintains the pen's appearance, and makes operation more convenient.
[0005] The present invention accomplishes its objective as follows: a ballpoint pen structure with gravity-controlled refill switching includes a refill sleeve, at least two refills disposed within the refill sleeve and capable of sliding along the length of the refill sleeve, a refill retainer fixed to one end of the refill sleeve to prevent the refills from detaching from the refill sleeve, a refill drive disposed within the refill retainer and capable of sliding along the length of the refill retainer, and a pin disposed within the refill retainer with one end oscillatingly connected to the shaft of the refill drive and the other end forming a free end. The pin selects different refills by oscillating in different directions under the action of gravity through its free end. The refill sleeve and the refill retainer are respectively nested within a pen barrel.
[0006] In a specific embodiment of this utility model, a refill receiving cavity is provided in one end of the refill sleeve, and a set of refill grooves corresponding to the number of refills are provided in the other end of the refill sleeve around the circumference. A refill through hole communicating with the refill receiving cavity is provided at the bottom of each refill groove. One end of the refill passes through the corresponding refill groove and the refill through hole in sequence and is inserted into the refill receiving cavity. A spring is sleeved on the other end of the refill and a refill limiting block is fixed at the end of the spring. One end of the spring abuts against the refill through hole at the bottom of the corresponding refill groove, and the other end of the spring abuts against the corresponding refill limiting block. A pin fitting groove is provided on the end of the refill limiting block facing the pin.
[0007] In another specific embodiment of this utility model, the diameter of the pen refill groove is larger than the diameter of the pen refill and matches the diameter of the pen refill limiting block, and the diameter of the pen refill perforation matches the diameter of the pen refill.
[0008] In another specific embodiment of this utility model, the pen refill sleeve has a set of pins on the end facing the pen refill pressure sleeve. Correspondingly, the inner circumferential wall of the pen refill pressure sleeve facing the pen refill sleeve has a set of slots for mating with the pins. The edge of the pen refill pressure sleeve facing the pen refill sleeve abuts against the end of the pen refill with the pen refill limiting block, thereby preventing the pen refill from coming out of the pen refill sleeve.
[0009] In another specific embodiment of this utility model, the pen refill has a pen tip at the end away from the pen refill sleeve.
[0010] In another specific embodiment of this utility model, the pen refill driving component includes a pen refill driving rod and a pen refill limiting component. The pen refill driving rod has a cylindrical hollow structure and is sleeved on one end of the pen refill limiting component, which also has a cylindrical structure. One end of the pen refill driving rod passes through a pen refill pressing hole in the pen refill sleeve. The other end of the pen refill driving rod is formed with a ring of driving blocks spaced around the circumference. A driving block groove is formed between adjacent driving blocks. Each driving block has a driving block tooth on the end facing the pen refill limiting component. One end of the pen refill limiting component extends out of the pen refill driving rod and has a limiting component groove at the position corresponding to the driving block groove. The pen refill limiting component has a driving block tooth engaging part next to the limiting component groove and at the position corresponding to the driving block tooth. A ring of driving slide strips is provided inside the pen refill sleeve at intervals corresponding to the driving block groove and the limiting component groove. The driving block groove and the limiting component groove are respectively embedded in the driving slide strips. The pen tip can slide along the drive slide bar. When the end of the pen tip drive member extending from the pen tip sleeve is pressed, the pen tip drive rod and the pen tip limiting member can slide along the drive slide bar. When the limiting member slides out of the drive slide bar, the drive block teeth will force the pen tip limiting member to rotate through the drive block teeth engagement part. After the pen tip limiting member rotates, the drive block teeth engagement part abuts against the end of the drive slide bar, thereby preventing the pen tip limiting member from sliding along the drive slide bar. At this time, the pen tip limiting member will push the ejector pin out. The pen refill is oscillating in the direction of its swing; when the pen refill driver is pressed again at the end of the pen refill sleeve, the pen refill driver rod is pushed by the drive block tooth to disengage from the end of the drive slide bar. At this time, the drive block tooth is rotated again under the action of the drive block tooth. After the pen refill limiter rotates, the limiter groove is aligned with the drive slide bar again, so that the pen refill limiter can slide along the drive slide bar to the end away from the pen refill. At this time, the pen refill that was pushed out retracts because it loses the restriction of the push pin.
[0011] In a further specific embodiment of this utility model, the pen refill limiting member has a shaft head cavity at one end facing the ejector pin, and one end of the ejector pin has a shaft head that cooperates with the shaft head cavity. The shaft head and the shaft head cavity are connected to each other, so that the other end of the ejector pin can swing freely under the action of gravity.
[0012] In a further specific embodiment of this utility model, a pen barrel cavity extending through its length is formed inside the pen barrel. The pen refill sleeve and the pen refill pressure sleeve are nested and installed inside the pen barrel cavity. A pen tip is provided at one end of the pen barrel where the pen refill sleeve is installed. A pen clip is fixed on the side wall of the other end of the pen barrel. A pressure cap is provided at the other end of the pen barrel. One end of the pressure cap extends into the pen barrel and is fixed in cooperation with the pen refill driving rod of the pen refill driving component. The other end of the pressure cap extends out of the pen barrel.
[0013] In another specific embodiment of this utility model, a set of color markings, the same number as the pen refills, are arranged around the outer wall of one end of the pen barrel in a circumferential direction, and the positions of the color markings correspond to the positions of the corresponding pen refills.
[0014] In another specific embodiment of this utility model, the pen tip has a conical structure, and the inside of the pen tip forms a conical surface, which facilitates the output of the pen refill. The pen tip has a pen tip fixing thread on the side facing the pen barrel, and the pen tip is fixedly connected to the inner side wall of one end of the pen barrel through the pen tip fixing thread.
[0015] The present invention, by adopting the above-described structure, has the following beneficial effects: Because it uses a pen refill drive component to control a pin that swings with the direction of gravity to select different colored refills, it significantly reduces the number of parts compared to existing structures on the market. Furthermore, it eliminates the need for a protruding push rod on the surface of the ballpoint pen or for increasing the diameter of the pen to accommodate more components. This results in a simple structure, fewer parts, and easier operation, effectively improving the stability and appearance of the ballpoint pen and meeting the requirements of industrial-scale production. Attached Figure Description
[0016] Figure 1 This is an exploded perspective view of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the pen refill sleeve described in this utility model; Figure 3 This is a schematic diagram of the structure of the pen refill driver and pen refill sleeve described in this utility model; Figure 4 This is a partial cross-sectional view of the pen refill sleeve, pen refill, pen refill driver and pen refill pressure sleeve assembled according to the present invention. Figure 5 for Figure 1 A perspective view of the embodiment.
[0017] In the diagram: 1. Pen refill sleeve, 11. Pen refill receiving cavity, 12. Pen refill groove, 121. Pen refill through hole, 13. Pin; 2. Pen refill, 21. Pen refill limiting block, 211. Ejector pin mating groove, 22. Spring, 23. Pen refill tip; 3. Pen refill driving component, 31. Pen refill driving rod, 311. Driving block, 3111. Driving block retaining tooth, 312. Driving block groove, 32. Pen refill limiting component, 321. Limiting component groove, 322. Driving block retaining tooth mating part, 323. Shaft head cavity; 4. Pen refill pressure sleeve, 41. Pen refill pressure sleeve hole, 42. Slot, 43. Driving slide bar; 5. Pen barrel, 51. Pen barrel cavity, 52. Pen tip, 521. Pen tip fixing thread, 522. Conical surface, 53. Pen clip, 54. Color mark, 55. Pressure cap; 6. Ejector pin, 61. Shaft head. Detailed Implementation
[0018] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.
[0019] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 The positions shown are for reference only and should not be construed as a particular limitation on the technical solutions provided by this utility model.
[0020] Please see Figure 1 This utility model relates to a ballpoint pen structure with gravity-controlled refill switching, comprising a refill sleeve 1, at least two refills 2 disposed within the refill sleeve 1 and capable of sliding along the length of the refill sleeve 1, a refill retainer 4 fixed to one end of the refill sleeve 1 to prevent the refills 2 from detaching from the refill sleeve 1, a refill drive 3 disposed within the refill retainer 4 and capable of sliding along the length of the refill retainer 4, and a pin 6 disposed within the refill retainer 4, one end of which is oscillatingly connected to the shaft of the refill drive 3, and the other end forming a free end. The pin 6 selects different refills 2 by oscillating in different directions under the action of gravity through its free end. The refill sleeve 1 and the refill retainer 4 are respectively nested within a pen barrel 5. In this embodiment, the number of refills 2 is four, and each refill is a different color.
[0021] Please see Figure 1 and combined Figure 2 and Figure 4 The aforementioned pen refill sleeve 1 has a pen refill receiving cavity 11 at one end, and a set of pen refill grooves 12 corresponding to the number of pen refills 2 are formed around the other end of the pen refill sleeve 1 in a circumferential direction. A pen refill through hole 121 communicating with the pen refill receiving cavity 11 is formed at the bottom of each of the aforementioned pen refill grooves 12. One end of the aforementioned pen refill 2 passes through the corresponding pen refill groove 12 and pen refill through hole 121 in sequence and is inserted into the pen refill receiving cavity 11. A spring 22 is fitted onto the other end of the aforementioned pen refill 2, and a pen refill limiting block 21 is fixed to that end. One end of the aforementioned spring 22 abuts against the pen refill through hole 121 at the bottom of the corresponding pen refill groove 12, and the other end of the aforementioned spring 22 abuts against the corresponding pen refill limiting block 21. The aforementioned pen refill limiting block 21 has a pin mating groove 211 on the end facing the pin 6. A pen refill tip 23 is provided at the end of the pen refill 2 away from the pen refill sleeve 4.
[0022] Furthermore, the diameter of the aforementioned pen refill groove 12 is larger than the diameter of the pen refill 2, and is the same as the diameter of the pen refill limiting block 21, and the diameter of the aforementioned pen refill through hole 121 is the same as the diameter of the aforementioned pen refill 2.
[0023] Please see Figure 1 and combined Figure 3 The aforementioned pen refill sleeve 1 has a set of pins 13 on the end facing the pen refill pressure sleeve 4. Correspondingly, the inner circumferential wall of the aforementioned pen refill pressure sleeve 4 facing the pen refill sleeve 1 has a set of slots 42 for mating with the pins 13. The edge of the aforementioned pen refill pressure sleeve 4 facing the pen refill sleeve 1 abuts against the end position of the pen refill 2 with the pen refill limiting block 21, for preventing the pen refill 2 from coming out of the pen refill sleeve 1.
[0024] Please see Figure 3The aforementioned pen refill driving component 3 includes a pen refill driving rod 31 and a pen refill limiting component 32. The aforementioned pen refill driving rod 31 has a cylindrical hollow structure and is sleeved on one end of the pen refill limiting component 32, which also has a cylindrical structure. One end of the aforementioned pen refill driving rod 31 protrudes from a pen refill pressing hole 41 opened on the pen refill pressing sleeve 4. The other end of the aforementioned pen refill driving rod 31 has a ring of driving blocks 311 spaced around the circumference. A driving block groove 312 is formed between adjacent driving blocks 311. A driving block tooth 3 is formed on the end of the aforementioned driving blocks 311 facing the pen refill limiting component 32. 111; One end of the aforementioned pen refill limiting member 32 extends out to the pen refill driving rod 31, and a limiting member groove 321 is respectively opened at the position corresponding to the driving block groove 312. The aforementioned pen refill limiting member 32 is provided with a driving block tooth mating part 322 next to the limiting member groove 321 and at the position corresponding to the driving block tooth 3111. The aforementioned pen refill pressure sleeve 4 is provided with a ring of driving slide bar 43 at intervals at the positions corresponding to the driving block groove 312 and the limiting member groove 321. The aforementioned driving block groove 312 and the limiting member groove 321 are respectively embedded in the driving slide bar 43 and can move along the driving slide bar. 43. When the aforementioned pen refill drive 3 extends out of the pen refill sleeve 4, pressing down on one end causes the aforementioned pen refill drive rod 31 and pen refill limiting member 32 to slide along the drive slide bar 43. When the aforementioned limiting member slide groove 321 slides out of the drive slide bar 43, the aforementioned drive block locking teeth 3111 will force the pen refill limiting member 32 to rotate through the drive block locking tooth engagement part 322. After the aforementioned pen refill limiting member 32 rotates, the drive block locking tooth engagement part 322 abuts against the end of the drive slide bar 43, thereby preventing the pen refill limiting member 32 from sliding along the drive slide bar 43. At this time, the aforementioned pen refill limiting member 32 will push the ejector pin 6 to swing out. The pen refill 2 is in the direction of the pen refill drive member 3. When the pen refill drive member 3 is pressed again to extend one end of the pen refill sleeve 4, the pen refill drive rod 31 pushes the drive block tooth engagement part 322 away from the end of the drive slide bar 43 through the drive block tooth 3111. At this time, the drive block tooth engagement part 322 rotates again under the action of the drive block tooth 3111. After the pen refill limit member 32 rotates, the limit member groove 321 is aligned with the drive slide bar 43 again, so that the pen refill limit member 32 can slide along the drive slide bar 43 to the end away from the pen refill 2. At this time, the pen refill 2 that was pushed out retracts because it loses the restriction of the push pin 6.
[0025] Furthermore, the aforementioned pen refill limiting member 32 has a shaft head cavity 323 at one end facing the ejector pin 6, and the aforementioned ejector pin 6 has a shaft head 61 that cooperates with the shaft head cavity 323 at one end. The aforementioned shaft head 61 is connected to the shaft head cavity 323, thereby allowing the other end of the ejector pin 6 to swing freely under the action of gravity.
[0026] Please see Figure 1 and combined Figure 5The aforementioned pen barrel 5 has a pen barrel cavity 51 extending through its length. The aforementioned pen refill sleeve 1 and pen refill pressure sleeve 4 are nested and installed in the pen barrel cavity 51. The aforementioned pen barrel 5 has a pen tip 52 at one end where the pen refill sleeve 1 is installed. The aforementioned pen barrel 5 has a pen clip 53 fixed on the side wall at the other end. The aforementioned pen barrel 5 has a pressure cap 55 at the other end. One end of the aforementioned pressure cap 55 extends into the pen barrel 5 and is fixed in cooperation with the pen refill drive rod 31 of the pen refill drive member 3. The other end of the aforementioned pressure cap 55 extends out of the pen barrel 5.
[0027] On the outer side wall of one end of the aforementioned pen barrel 5, there is a set of color markings 54 in the same number as the pen refill 2, arranged around the circumference. The positions of the aforementioned color markings 54 correspond to the positions of the corresponding pen refill 2.
[0028] The aforementioned pen tip 52 has a conical structure, and the interior of the aforementioned pen tip 52 forms a conical surface 522, which facilitates the delivery of the pen core 2. The aforementioned pen tip 52 has a pen tip fixing thread 521 on the side facing the pen barrel 5. The aforementioned pen tip 52 is threadedly connected and fixed to the inner side wall of one end of the pen barrel 5 through the pen tip fixing thread 521.
[0029] Please continue reading. Figures 1-5When a ballpoint pen is needed, first select the desired color of the pen refill 2 using the aforementioned color indicator 54, and place the corresponding color indicator 54 horizontally upwards. At this time, the free end of the aforementioned ejector pin 6 swings downwards under the action of gravity and is precisely aligned with the corresponding color pen refill 2. Then press the aforementioned pressure cap 55 to push the pen refill drive rod 31, causing the pen refill drive rod 31 and the pen refill limiting member 32 to slide along the drive slide bar 43. When the aforementioned limiting member slide groove 321 disengages from the drive slide bar 43, the drive block locking teeth 3111 will force the pen through the drive block locking tooth mating part 322. When the lead limiting member 32 rotates, the drive block tooth engagement part 322 abuts against the end of the drive slide bar 43 to prevent the lead limiting member 32 from sliding along the drive slide bar 43. During this process, the lead limiting member 32 pushes the pin 6 to press against the pin engagement groove 211 of the corresponding lead 2, so that the lead 2 overcomes the elastic force of the corresponding spring 22 and slides towards the lead receiving cavity 11. The lead tip 23 on the lead 2 slides out of the tip 52 along the conical surface 522 inside the tip 52. At this time, the user can write according to the selected color of the ballpoint pen lead. When it is necessary to retract the aforementioned pen refill 2, press the aforementioned pressure cap 55 again to cause the pen refill drive rod 31 to push the drive block tooth engagement part 322 away from the end of the drive slide bar 43 through the drive block tooth 3111. The aforementioned drive block tooth engagement part 322 rotates again under the action of the drive block tooth 3111. After the aforementioned pen refill limiting member 32 rotates, the limiting member groove 321 is aligned with the drive slide bar 43 again, so that the pen refill limiting member 32 can slide along the drive slide bar 43 to the end away from the pen refill 2. During this process, the aforementioned pen refill 2 that has been pushed out loses the restriction of the ejector pin 6. The aforementioned pen refill 2 slides away from the pen refill receiving cavity 11 under the elastic force of the corresponding spring 22. At this time, the pen refill head 23 of the aforementioned pen refill 2 retracts into the pen tip 52.
[0030] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.
[0031] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.
Claims
1. A ballpoint pen structure with a gravity-switching refill, characterized in that: The device includes a pen refill sleeve (1), at least two pen refills (2) disposed inside the pen refill sleeve (1) and capable of sliding along the length of the pen refill sleeve (1), a pen refill pressure sleeve (4) fixed at one end of the pen refill sleeve (1) to restrict the pen refills (2) from being removed from the pen refill sleeve (1), a pen refill drive (3) disposed inside the pen refill pressure sleeve (4) and capable of sliding along the length of the pen refill pressure sleeve (4), and a pin (6) disposed inside the pen refill pressure sleeve (4) with one end oscillatingly connected to the shaft of the pen refill drive (3) and the other end forming a free end. The pin (6) selects different pen refills (2) by oscillating in different directions under the action of gravity through its free end. The pen refill sleeve (1) and the pen refill pressure sleeve (4) are respectively nested inside a pen barrel (5).
2. The ballpoint pen structure with gravity-switching refill according to claim 1, characterized in that: One end of the pen refill sleeve (1) has a pen refill receiving cavity (11), and the other end of the pen refill sleeve (1) has a set of pen refill grooves (12) in a circumferential direction, the number of which corresponds to the number of pen refills (2). At the bottom of each pen refill groove (12), a pen refill through hole (121) is formed, which communicates with the pen refill receiving cavity (11). One end of the pen refill (2) passes through the corresponding pen refill groove (12) and pen refill through hole (121) in sequence and is then inserted into the pen refill receiving cavity. Inside the cavity (11), a spring (22) is fitted on the other end of the pen refill (2) and a pen refill limiting block (21) is fixed at the end of the pen refill. One end of the spring (22) abuts against the pen refill through hole (121) at the bottom of the corresponding pen refill groove (12), and the other end of the spring (22) abuts against the corresponding pen refill limiting block (21). The pen refill limiting block (21) has a pin mating groove (211) on the end facing the pin (6).
3. The ballpoint pen structure with gravity-switching refill according to claim 2, characterized in that: The diameter of the pen refill groove (12) is larger than the diameter of the pen refill (2) and matches the diameter of the pen refill limiting block (21), and the diameter of the pen refill perforation (121) matches the diameter of the pen refill (2).
4. The ballpoint pen structure with gravity-switching refill according to claim 2, characterized in that: The pen refill sleeve (1) has a set of pins (13) on one end facing the pen refill pressure sleeve (4). Correspondingly, the inner circumferential wall of the pen refill pressure sleeve (4) facing the pen refill sleeve (1) has a set of slots (42) for mating with the pins (13). The edge of the pen refill pressure sleeve (4) facing the pen refill sleeve (1) abuts against the end of the pen refill (2) with the pen refill limiting block (21) to prevent the pen refill (2) from coming out of the pen refill sleeve (1).
5. The ballpoint pen structure with gravity-switching refill according to claim 1, characterized in that: The pen refill (2) has a pen tip (23) at the end away from the pen refill sleeve (4).
6. The ballpoint pen structure with gravity-switching refill according to claim 1, characterized in that: The pen refill drive (3) includes a pen refill drive rod (31) and a pen refill limiting member (32). The pen refill drive rod (31) has a cylindrical hollow structure and is sleeved on one end of the pen refill limiting member (32), which also has a cylindrical structure. One end of the pen refill drive rod (31) passes through a pen refill pressing hole (41) opened on the pen refill pressing sleeve (4). The other end of the pen refill drive rod (31) is formed with a ring of drive blocks (311) spaced around the circumference. A drive block groove (312) is formed between adjacent drive blocks (311). A drive block tooth (3111) is formed on the end of the drive block (311) facing the pen refill limiting member (32). One end of the pen refill limiting member (32) extends out of the pen refill driving rod (31), and a limiting member groove (321) is respectively opened at the position corresponding to the driving block groove (312). The pen refill limiting member (32) is provided with a driving block tooth mating part (322) on the side of the limiting member groove (321) and at the position corresponding to the driving block tooth (3111). The pen refill pressure sleeve (4) is provided with a ring of driving slide strips (43) at intervals at the positions corresponding to the driving block groove (312) and the limiting member groove (321). The driving block groove (312) and the limiting member groove (321) are respectively embedded in the driving slide strips (43) and can slide along the driving slide strips (43). When the pen refill drive member (3) is pressed to extend one end of the pen refill sleeve (4), the pen refill drive rod (31) and the pen refill limiting member (32) can slide along the drive slide bar (43). When the limiting member slide groove (321) slides to disengage from the drive slide bar (43), the drive block tooth (3111) will force the pen refill limiting member (322) to rotate through the drive block tooth engagement part (322). After the pen refill limiting member (322) rotates, the drive block tooth engagement part (322) abuts against the end of the drive slide bar (43), thereby preventing the pen refill limiting member (32) from sliding along the drive slide bar (43). At this time, the pen refill limiting member (32) will push the ejector pin (6) out of its swing direction. The pen refill (2) is pressed again. When the pen refill drive (3) extends out of the pen refill sleeve (4), the pen refill drive rod (31) pushes the drive block tooth engagement part (322) away from the end of the drive slide bar (43) through the drive block tooth (3111). At this time, the drive block tooth engagement part (322) rotates again under the action of the drive block tooth (3111). After the pen refill limiter (32) rotates, the limiter groove (321) is aligned with the drive slide bar (43) again, so that the pen refill limiter (32) can slide along the drive slide bar (43) away from the pen refill (2). At this time, the pen refill (2) that was pushed out retracts because it loses the restriction of the pin (6).
7. The ballpoint pen structure with gravity-switching refill according to claim 6, characterized in that: The pen refill limiting member (32) has a shaft head cavity (323) at one end facing the ejector pin (6), and one end of the ejector pin (6) has a shaft head (61) that cooperates with the shaft head cavity (323). The shaft head (61) and the shaft head cavity (323) are connected to each other, so that the other end of the ejector pin (6) can swing freely under the action of gravity.
8. The ballpoint pen structure with gravity-switching refill according to claim 6, characterized in that: The pen barrel (5) has a pen barrel cavity (51) extending through its length. The pen refill sleeve (1) and the pen refill pressure sleeve (4) are nested and installed in the pen barrel cavity (51). The pen barrel (5) has a pen tip (52) at one end where the pen refill sleeve (1) is installed. The pen barrel (5) has a pen clip (53) fixed on the side wall at the other end. The pen barrel (5) has a pressure cap (55) at the other end. One end of the pressure cap (55) extends into the pen barrel (5) and is fixed in cooperation with the pen refill drive rod (31) of the pen refill drive member (3). The other end of the pressure cap (55) extends out of the pen barrel (5).
9. The ballpoint pen structure with gravity-switching refill according to claim 8, characterized in that: On one end of the outer wall of the pen barrel (5), a set of color markings (54) with the same number as the pen refills (2) are arranged around the circumference. The positions of the color markings (54) correspond to the positions of the corresponding pen refills (2).
10. The ballpoint pen structure with gravity-switching refill according to claim 8, characterized in that: The pen tip (52) has a conical structure, and the inside of the pen tip (52) forms a conical surface (522) to facilitate the delivery of the pen core (2). The pen tip (52) has a pen tip fixing thread (521) on the side facing the pen barrel (5). The pen tip (52) is threadedly connected and fixed to the inner wall of one end of the pen barrel (5) through the pen tip fixing thread (521).