Novel telescopic ball-point pen
By using a new type of pen tip push rod and a ratchet structure for the rotary cylinder, the problems of noise and single driving method in traditional ballpoint pens during extension and retraction are solved, achieving silent and flexible pen tip extension and retraction operation.
Patent Information
- Application Number
- CN202520076364.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-14
AI Technical Summary
Traditional ballpoint pens produce a clicking sound during the extension and retraction process, which can disturb others or oneself. In addition, the driving method is singular and cannot complete the extension and retraction of the pen tip in a normal pen-holding posture.
It adopts a new type of pen refill rod, rotating cylinder and pawl structure. By holding the lower pen tube with the index and middle fingers and holding the pen cap with the thumb and forefinger, the pen refill rod can move axially and rotate in conjunction with the spring force of the compressed spring, avoiding sudden rotation noise and achieving silent extension and retraction.
It achieves silent tip extension and retraction without significant changes in pen holding posture, avoiding the sudden noise of traditional ballpoint pens, and can complete the tip extension and retraction conversion under normal pen holding posture.
Smart Images
Figure CN223835295U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ballpoint pen technology, and in particular to a novel telescopic ballpoint pen. Background Technology
[0002] Traditional ballpoint pens make a clicking sound when the tip retracts or extends, as the spring holds the tip and drives the rotating wheel. This can be disruptive in quiet environments like classrooms or libraries, easily disturbing others or causing the writer to lose focus. Furthermore, the clicking sound can unconsciously encourage students to repeatedly press the pen, further hindering concentration. Secondly, the traditional method of retracting the tip is too simplistic and unchanging. It always involves pressing a pin at the top to push the rotating wheel against a ratchet on the inner wall of the pen tube, requiring the thumb to be used each time, making it impossible to retract the tip using a normal writing grip.
[0003] For the reasons mentioned above, the inventors believe it is necessary to design a new type of retractable ballpoint pen that can operate the retraction of the pen tip without significant changes in pen-holding posture and achieves silent operation during the retraction and extension process. Utility Model Content
[0004] The purpose of this utility model is to provide a new type of telescopic ballpoint pen. The technical problem to be solved is that the drive structure is unchanged, and the extension and retraction of the pen tip can only be completed by pressing the upper post of the pen with the thumb. Moreover, the jumping noise of the spring-loaded rotating wheel is too loud, which can easily disturb others or distract oneself.
[0005] To solve the above-mentioned technical problems, this utility model provides a novel telescopic ballpoint pen, which includes an upper pen tube, a lower pen tube, a pen refill, a pen refill telescopic assembly, and a pen cap. The pen refill telescopic assembly includes a compression spring, a pen refill rod, and a rotating cylinder.
[0006] The pen tip rod is coaxially inserted into the upper pen tube. The lower end of the pen tip rod abuts against the rear end of the pen tip. The upper end of the pen tip rod extends out of the upper end tube hole of the upper pen tube and is detachably fixedly connected to the upper end side wall of the pen cap.
[0007] The rotating cylinder is coaxially matched and axially fixed, and can rotate relative to each other. Two pawl groups are arranged in a ring around the central axis on the outer wall of the rotating cylinder. Each pawl group includes an upper pawl and a lower pawl that are axially corresponding to each other.
[0008] An annular retaining ring protrudes from the inner wall of the upper end of the upper tube hole of the upper pen tube, and the annular retaining ring is engaged between the upper end pawl and the lower end pawl; the lower end of the annular retaining ring is provided with an end face telescopic ratchet structure, which is formed by two retracting ratchet grooves and two extending ratchet grooves connected alternately in sequence; the upper end of the annular retaining ring is provided with an end face jumping ratchet structure, which is formed by two retracting jumping grooves and two extending jumping grooves connected alternately in sequence;
[0009] The depths of the retractable ratchet groove and the extended ratchet groove are the same, both greater than the depth of the extended ratchet groove which is less than the depth of the retractable ratchet groove. The lengths of the retractable ratchet groove and the retractable ratchet groove in the corresponding circumferential direction are the same, and the lengths of the extended ratchet groove and the extended ratchet groove in the corresponding circumferential direction are the same. The tooth grooves between the end-face telescopic ratchet structure and the end-face jumping ratchet structure are respectively staggered. The bottom of the retractable ratchet groove is axially aligned with the middle position of the inclined groove wall of the retractable ratchet groove, and the bottom of the extended ratchet groove is axially aligned with the middle position of the inclined groove wall of the extended ratchet groove.
[0010] Preferably, the upper pen tube and the lower pen tube are coaxially threaded together, the pen refill is coaxially inserted into the upper pen tube and the lower pen tube, the pen tip of the pen refill can extend or retract into the pen tip hole at the lower end of the lower pen tube, and the pen cap is coaxially sleeved on the upper pen tube; the compression spring is sleeved on the front part of the pen refill, one end of the compression spring abuts against the shoulder of the front end of the pen refill, and the other end of the compression spring abuts against the inner shoulder of the pen tip hole at the lower end of the lower pen tube.
[0011] Preferably, the upper and lower pawls are respectively provided with inclined surfaces (,) with opposite inclination directions at their corresponding ends; the distance between the upper and lower pawls matches the maximum extension stroke of the pen tip; the axial length of the annular retaining ring matches the distance between the upper and lower pawls; the inner diameter of the annular retaining ring is smaller than the outer diameter of the upper and lower pawls; the inclination direction of the retracting ratchet groove and the extending ratchet groove is the same as the inclination direction of the inclined surface on the lower pawl; the depth of the retracting ratchet groove is greater than the length of the pen tip extending out of the pen tip hole; the inclination direction of the retracting jump groove and the extending jump groove is the same as the inclination direction of the inclined surface on the upper pawl.
[0012] Preferably, the length of the pen cap is greater than the length of the upper pen tube. When the upper side wall of the pen cap is connected to the upper end of the pen refill rod, the lower end of the pen cap extends beyond the lower end of the upper pen tube. The connection part of the upper pen tube and the lower pen tube, which are coaxially threaded together, is covered in the pen cap. In addition, a flexible anti-slip sleeve is fitted on the outer wall of the lower pen tube. The flexible anti-slip sleeve can improve the grip comfort during writing and also prevent the pen from slipping out of the hand.
[0013] Preferably, the upper pen tube has a plurality of axial keyways arranged in a ring array around the central axis on the outer wall of the upper end, and the pen cap has a plurality of axial sliding keys arranged in a ring array around the central axis on the inner wall of the upper end. The inner diameter of the ring array formed by the plurality of axial sliding keys is smaller than the outer diameter of the upper pen tube and not smaller than the diameter at the bottom wall of the axial keyway. The axial sliding keys can slide axially in the axial keyway, and the sliding stroke of the axial sliding keys in the axial keyway is the same as the distance between the upper pawl and the lower pawl.
[0014] Preferably, a push plate is coaxially disposed at the lower end of the pen refill rod, the diameter of the push plate being larger than the diameter of the pen refill and smaller than the inner diameter of the upper and lower pen tubes; an annular groove is formed on the outer axial surface of the upper end of the pen refill rod; furthermore, the upper end of the pen refill rod located at the annular groove is configured with a round head or a conical head structure; a connecting tube is axially protruding from the upper sidewall of the pen cap towards the inner side of the pen cap, the inner diameter of the connecting tube matching the diameter of the pen refill rod; an annular retaining rib matching the annular groove is protruding from the upper wall of the connecting tube; the upper end of the pen refill rod is inserted into the connecting tube; the annular retaining rib is engaged in the annular groove; and the distance between the lower end face of the connecting tube and the upper end face of the push plate is matched with the length of the rotating cylinder tube.
[0015] Preferably, the upper end of the rotary drum tube has corresponding cuts on both sides of the tube wall extending axially upwards and penetrating the tube wall. The two cuts divide the upper end of the rotary drum tube into two halves. The two upper pawls are located on the upper end of the two halves of the tube wall. The axial length of the cut is not less than half the length of the rotary drum tube, and the width of the cut is not less than twice the radial height of the upper pawl.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. Whether the pen cap is pressed down, causing the upper pawl to slide in the retracting or extending slot of the ratchet wheel on the end face, or the pen tip is pushed by the compression spring to drive the pen tip rod and link the lower pawl into the retracting or extending slot, the lower pawl slides on the inclined groove wall of the retracting or extending slot. The entire rotating cylinder moves and rotates simultaneously, and the whole process is smooth. Therefore, it avoids the "click" jumping sound produced by the sudden rotation under the compression spring and the ratchet when the traditional ballpoint pen moves to the node in the axial movement. It achieves the effect of silent jumping and retracting pen tip.
[0018] 2. A writing-like posture can be adopted, with the index and middle fingers holding the lower pen tube, and the thumb and forefinger holding the pen cap. Then, the index and middle fingers pull the lower pen tube inwards towards the palm, forming a corresponding pressing action on the pen cap. This drives the pen tip rod to overcome the elastic force of the compression spring and move it downwards, simultaneously rotating the rotating cylinder and completing the pen tip extension and retraction action. There is no need to extend a finger to press the top of the pen cap. Attached Figure Description
[0019] Figure 1 This is a three-dimensional exploded view of the telescopic ballpoint pen of this utility model.
[0020] Figure 2 This is a three-dimensional structural diagram of the telescopic ballpoint pen of this utility model;
[0021] Figure 3 This is a three-dimensional structural diagram of the impeller tube of this utility model;
[0022] Figure 4 This is a partial cross-sectional view of the upper pen tube of this utility model;
[0023] Figure 5 This is a schematic diagram of another angle showing a partial cross-sectional view of the upper pen tube of this utility model;
[0024] Figure 6 This is a partial cross-sectional view of the pen cap of this utility model;
[0025] Figure 7 This is a three-dimensional structural diagram of the pen refill rod of this utility model;
[0026] Figure 8 This is a three-dimensional structural diagram of the pen tube of this utility model.
[0027] In the accompanying drawings of the instruction manual:
[0028] 1. Upper pen tube; 11. Annular ring; 12. Retracting ratchet groove; 13. Extending ratchet groove; 14. Retracting jump groove; 15. Extending jump groove; 16. Axial keyway; 2. Lower pen tube; 21. Pen tip hole; 22. Flexible anti-slip sleeve; 3. Pen refill; 31. Pen tip; 32. Shoulder; 4. Pen refill telescopic assembly; 41. Compression spring; 42. Pen refill push rod; 421. Push plate; 422. Annular groove; 43. Rotary cylinder tube; 431. Upper pawl; 432. Lower pawl; 44. Cutout; 5. Pen cap; 51. Axial sliding key; 52. Connecting tube; 53. Annular rib. Detailed Implementation
[0029] The following will be combined with the appendix Figure 1-8 The present invention will be described in more detail with reference to preferred embodiments of a novel telescopic ballpoint pen.
[0030] like Figure 1-8 As shown, this utility model provides a novel telescopic ballpoint pen, which includes an upper pen tube 1, a lower pen tube 2, a pen core 3, a pen core telescopic assembly 4, and a pen cap 5. The upper pen tube 1 and the lower pen tube 2 are coaxially threaded together, and their connection method is the same as that of traditional pen tubes. The pen core 3 is coaxially inserted into the upper pen tube 1 and the lower pen tube 2. The pen tip 31 of the pen core 3 can extend or retract into the pen tip hole 21 at the lower end of the lower pen tube 2. The pen cap 5 is coaxially sleeved on the upper pen tube 1.
[0031] The retractable pen refill assembly 4 includes a compression spring 41, a pen refill rod 42, and a rotating tube 43. The compression spring 41 is sleeved on the front of the pen refill 3. One end of the compression spring 41 abuts against the shoulder 32 at the front end of the pen refill 3, and the other end of the compression spring 41 abuts against the inner shoulder of the pen tip hole 21 at the lower end of the lower pen tube 2. The structure and working principle of the compression spring 41 installed between the pen refill 3 and the lower pen tube 2 are the same as those in a traditional retractable ballpoint pen, so they will not be described in detail.
[0032] The pen tip rod 42 is coaxially inserted into the upper pen tube 1. The lower end of the pen tip rod 42 abuts against the rear end of the pen tip 3, and the upper end of the pen tip rod 42 extends out of the upper end tube hole of the upper pen tube 1 and is detachably fixedly connected to the upper end side wall of the pen cap 5.
[0033] like Figure 3As shown, the rotating tube 43 is coaxially matched and axially fixedly sleeved on the pen tip rod 42. The rotating tube 43 can rotate on the pen tip rod 42. Two pawl groups are arranged in a ring array around the central axis on the outer tube wall of the rotating tube 43. Each of the two pawl groups includes an upper pawl 431 and a lower pawl 432 that are axially corresponding to each other. The upper pawl 431 and the lower pawl 432 are respectively provided with inclined surfaces (433, 434) with opposite inclination directions at their corresponding ends. The distance between the upper pawl 431 and the lower pawl 432 matches the maximum extension stroke of the pen tip 31.
[0034] like Figure 4 , 5 As shown, an annular retaining ring 11 protrudes from the inner wall of the upper end tube hole of the upper pen tube 1. The axial length of the annular retaining ring 11 matches the distance between the upper pawl 431 and the lower pawl 432. The inner diameter of the annular retaining ring 11 is smaller than the outer diameter of the upper pawl 431 and the lower pawl 432. The annular retaining ring 11 is engaged between the upper pawl 431 and the lower pawl 432.
[0035] The lower end of the annular retaining ring 11 is provided with an end-face telescopic ratchet structure. The end-face telescopic ratchet structure is formed by two retractable ratchet grooves 12 and two protruding ratchet grooves 13 connected alternately in sequence. The inclination direction of the retractable ratchet grooves 12 and the protruding ratchet grooves 13 is the same as the inclination direction of the inclined surface 434 on the lower end pawl 432. The depth of the retractable ratchet groove 12 is greater than the length of the pen tip 31 extending out of the pen tip hole 21.
[0036] The upper end of the annular retaining ring 11 is provided with an end-face jumping ratchet structure. The end-face jumping ratchet structure is formed by two retracting jumping grooves 14 and two extending jumping grooves 15 connected alternately in sequence. The inclination direction of the retracting jumping grooves 14 and the extending jumping grooves 15 is the same as the inclination direction of the inclined surface 433 on the upper pawl 431. The depth of the retracting jumping grooves 14 and the extending jumping grooves 15 is the same, which is greater than the depth of the extending ratchet groove 13 and less than the depth of the retracting ratchet groove 12. The lengths of the retracting jumping grooves 14 and 12 in the corresponding circumferential direction are the same, and the lengths of the extending jumping grooves 15 and 13 in the corresponding circumferential direction are the same. The grooves between the end-face telescopic ratchet structure and the end-face jumping ratchet structure are staggered. The bottom of the retracting ratchet groove 12 is axially aligned with the middle position of the inclined groove wall of the retracting jumping groove 14, and the bottom of the extending ratchet groove 13 is axially aligned with the middle position of the inclined groove wall of the extending jumping groove 15.
[0037] In the specific implementation of this utility model, when the pen tip 31 is in the extended state, the lower pawl 432 is engaged in the extended ratchet groove 13, and the rotating cylinder 43, in conjunction with the pen refill rod 42, pushes the rear end of the pen refill 3, causing the shoulder 32 of the pen refill 3 to compress the compression spring 41, so that the pen tip 31 extends out of the pen tip hole 21; when it is necessary to switch the state of the pen tip 31 to retracted, simply press the pen cap 5, causing the pen refill rod 42 to move towards... The downward axial movement causes the rotating cylinder 43 to descend, pushing the lower pawl 432 out of its current position in the protruding ratchet groove 13. Meanwhile, the upper pawl 431 enters the protruding jump groove 15 and continues to slide downwards, contacting the middle of the inclined groove wall. This causes the rotating cylinder 43 to rotate, and the lower pawl 432 jumps to align with the retracting ratchet groove 12. When the pen cap is released, the compression spring 41 holds the pen refill 3. The pen tip 3 moves axially upward in conjunction with the pen tip rod 42 and the rotating cylinder 43, while the lower pawl 432 jumps into the retractable ratchet groove 12. Whether the pen cap 5 is pressed, causing the upper pawl 431 to slide in the retractable or extended ratchet groove 14 or extended ratchet groove 15 of the end face ratchet wheel, or the pen tip 3 is pushed by the elastic force of the compression spring 41 to push the pen tip rod 42 and the lower pawl 432 into the retractable or extended ratchet groove 12 or extended ratchet groove 13, the lower pawl 432 slides on the inclined groove wall of the retractable or extended ratchet groove 12 or extended ratchet groove 13. The entire rotating cylinder 43 moves axially and rotates simultaneously, making the whole process smooth and seamless. Therefore, it avoids the "click" jumping sound caused by the sudden rotation under the elastic force of the compression spring and the guidance of the ratchet when the axial movement reaches the node during the extension and retraction process of a traditional ballpoint pen, thus achieving the effect of silent jumping extension and retraction of the pen tip.
[0038] Preferred embodiment: such as Figure 1 , 2As shown, the length of the pen cap 5 is greater than the length of the upper pen tube 1. When the upper side wall of the pen cap 5 is connected to the upper end of the pen refill rod 42, the lower end of the pen cap 5 extends beyond the lower end of the upper pen tube 1. The connection part of the upper pen tube 1 and the lower pen tube 2, which are coaxially threaded together, is covered in the pen cap 5. In addition, a flexible anti-slip sleeve 22 is fitted on the outer wall of the lower pen tube 2. The flexible anti-slip sleeve 22 can improve the comfort of holding the pen during writing and also prevent the pen from slipping out of the hand. In this embodiment, the pen cap 5 effectively covers the connection between the upper pen tube 1 and the lower pen tube 2, making the overall appearance more aesthetically pleasing. Furthermore, it allows for direct operation of the pen tip 31 during pen gripping. Specifically, in a writing posture, the index and middle fingers hold the lower pen tube 1 (clamped onto the flexible anti-slip sleeve 22), while the thumb and forefinger hold the pen cap 5. Then, the index and middle fingers pull the lower pen tube 2 inwards towards the palm, achieving a pen gripping posture similar to writing, which lifts the lower pen tube 2 to press the pen cap 5. This drives the pen core rod 42 to overcome the elastic force of the compression spring 41 and move it downwards, simultaneously rotating the rotating cylinder 43, thus completing the pen tip extension / retraction action.
[0039] Preferred embodiment: such as Figure 1 , 4 As shown in Figures 5 and 6, the upper pen tube 1 has several axial keyways 16 arranged in a circular array around the central axis on the outer wall of the upper end corresponding to the central axis. The pen cap 5 has several axial sliding keys 51 protruding in a circular array around the central axis on the inner wall of the upper end corresponding to the central axis. The inner diameter of the circular array formed by the axial sliding keys 51 is smaller than the outer diameter of the upper pen tube 1 and not smaller than the diameter at the bottom wall of the axial keyway 16. The axial sliding keys 51 can slide axially in the axial keyway 16, and the sliding stroke of the axial sliding key 51 in the axial keyway 16 is the same as the distance between the upper pawl 431 and the lower pawl 432. In the specific implementation process, this embodiment can prevent the rotating cylinder 43 from driving the pen tip rod 42 to rotate together during rotation, and avoid the pen cap 5 from rotating at the same time during the extension and retraction of the pen tip 31, which would affect the user experience and aesthetics.
[0040] Preferred embodiment: such as Figure 1 , 7As shown, a pusher plate 421 is coaxially disposed at the lower end of the pen refill rod 42. The diameter of the pusher plate 421 is larger than the diameter of the pen refill 3 but smaller than the inner diameter of the upper pen tube 1 and the lower pen tube 2. An annular groove 422 is formed on the outer axial surface of the upper end of the pen refill rod 42. Furthermore, the upper end of the pen refill rod 42 located in the annular groove 422 is configured with a round head or a conical head structure. An axial protrusion is provided on the upper sidewall of the pen cap 5 towards the inner side of the pen cap 5. A connecting tube 52 is provided, the inner diameter of which matches the diameter of the pen tip rod 42. An annular retaining rib 53, matching the annular retaining groove 422, protrudes from the inner wall of the connecting tube 52. The upper end of the pen tip rod 42 is inserted into the connecting tube 52, and the annular retaining rib 53 is engaged in the annular retaining groove 422. The distance between the lower end face of the connecting tube 52 and the upper end face of the push plate 421 matches the length of the rotating cylinder tube 43. In practical implementation, this embodiment facilitates a detachable connection between the pen tip rod 42 and the pen cap 5, and allows the rotating cylinder tube 43 to be relatively rotatable and axially fixedly fitted onto the pen tip rod 42.
[0041] Preferred embodiment: such as Figure 3 As shown, corresponding slits 44 extending axially upwards and penetrating the tube wall are provided on both sides of the upper end of the rotary tube 43. The two slits 44 divide the upper end of the rotary tube 43 into two halves. Two upper pawls 431 are located on the upper end of the two halves of the tube wall, respectively. The axial length of the slit 44 is not less than half the length of the rotary tube 43, and the width of the slit 44 is not less than twice the radial height of the upper pawls 431. In this embodiment, the slits 44 can be used to gather the two halves of the tube wall towards the middle like tweezers, so that the upper ends of the two upper pawls 431 on the rotary tube 43 can pass through the inner annular hole of the annular retaining ring 11 on the upper pen tube 1. Then, the pen tip rod 42 is inserted into the rotary tube 43 to achieve assembly, or the reverse operation can be used to achieve disassembly.
[0042] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structural and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. The embodiments of this utility model can also be modified based on these principles. Therefore, this utility model includes all substitutions within the scope mentioned in the claims. Any equivalent changes made within the scope of the claims of this utility model are within the scope of the patent application.
Claims
1. A novel telescopic ballpoint pen, comprising an upper pen tube (1), a lower pen tube (2), a pen refill (3), a pen refill telescopic assembly (4), and a pen cap (5), wherein the pen refill telescopic assembly (4) comprises a compression spring (41), a pen refill rod (42), and a rotating cylinder (43), characterized in that: The pen tip rod (42) is coaxially inserted into the upper pen tube (1). The lower end of the pen tip rod (42) abuts against the rear end of the pen tip (3). The upper end of the pen tip rod (42) extends out of the upper end tube hole of the upper pen tube (1) and is detachably fixedly connected to the upper side wall of the pen cap (5). The rotating cylinder tube (43) is coaxially matched and axially fixed on the pen tip rod (42) and can rotate relative to each other. Two pawl groups are arranged in a ring array around the central axis on the outer tube wall of the rotating cylinder tube (43). Each of the two pawl groups includes an upper pawl (431) and a lower pawl (432) that are axially corresponding to each other. An annular retaining ring (11) protrudes from the inner wall of the upper end of the upper tube hole of the upper pen tube (1). The annular retaining ring (11) is engaged between the upper pawl (431) and the lower pawl (432). The lower end of the annular retaining ring (11) is provided with an end-face telescopic ratchet structure, which is formed by alternating connection of two retractable ratchet grooves (12) and two extendable ratchet grooves (13). The upper end of the annular retaining ring (11) is provided with an end-face jumping ratchet structure, which is formed by alternating connection of two retractable jumping grooves (14) and two extendable jumping grooves (15). The depths of the jump grooves (15) are the same, both greater than the depth of the extended ratchet groove (13) and less than the depth of the retracted ratchet groove (12). The lengths of the retracted jump groove (14) and the retracted ratchet groove (12) in the corresponding circumferential direction are the same. The lengths of the extended jump grooves (15) and the extended ratchet grooves (13) in the corresponding circumferential direction are the same. The tooth grooves between the end face telescopic ratchet structure and the end face jump ratchet structure are respectively staggered. The bottom of the retracted ratchet groove (12) is axially aligned with the middle position of the inclined groove wall of the retracted jump groove (14). The bottom of the extended ratchet groove (13) is axially aligned with the middle position of the inclined groove wall of the extended jump groove (15).
2. The novel telescopic ballpoint pen as described in claim 1, characterized in that: The upper pen tube (1) and the lower pen tube (2) are coaxially threaded together. The pen core (3) is coaxially inserted in the upper pen tube (1) and the lower pen tube (2). The pen tip (31) of the pen core (3) can extend or retract into the pen tip hole (21) at the lower end of the lower pen tube (2). The pen cap (5) is coaxially sleeved on the upper pen tube (1). The compression spring (41) is sleeved on the front part of the pen core (3). One end of the compression spring (41) abuts against the shoulder (32) at the front end of the pen core (3). The other end of the compression spring (41) abuts against the inner shoulder of the pen tip hole (21) at the lower end of the lower pen tube (2).
3. The novel telescopic ballpoint pen as described in claim 2, characterized in that: The upper pawl (431) and the lower pawl (432) are respectively provided with inclined surfaces (433, 434) with opposite inclination directions at their corresponding ends. The distance between the upper pawl (431) and the lower pawl (432) matches the maximum extension stroke of the pen tip (31). The axial length of the annular retaining ring (11) matches the distance between the upper pawl (431) and the lower pawl (432). The inner diameter of the annular retaining ring (11) is smaller than that of the upper pawl (431). The outer diameter of the lower pawl (431) and the lower pawl (432); the inclination direction of the retractable ratchet groove (12) and the protruding ratchet groove (13) is the same as the inclination direction of the inclined surface (434) on the lower pawl (432); the depth of the retractable ratchet groove (12) is greater than the length of the pen tip (31) extending out of the pen tip hole (21); the inclination direction of the retractable jump groove (14) and the protruding jump groove (15) is the same as the inclination direction of the inclined surface (433) on the upper pawl (431).
4. The novel telescopic ballpoint pen as described in claim 3, characterized in that: The length of the pen cap (5) is greater than the length of the upper pen tube (1). When the upper side wall of the pen cap (5) is connected to the upper end of the pen core rod (42), the lower end of the pen cap (5) extends beyond the lower end of the upper pen tube (1). The connection part of the upper pen tube (1) and the lower pen tube (2) is coaxially threaded together and covered in the pen cap (5). In addition, a flexible anti-slip sleeve (22) is fitted on the outer wall of the lower pen tube (2).
5. The novel telescopic ballpoint pen as described in claim 4, characterized in that: The upper pen tube (1) has several axial keyways (16) arranged in a ring array around the central axis on the upper section of the outer tube wall. The pen cap (5) has several axial sliding keys (51) arranged in a ring array around the central axis on the upper section of the inner tube wall. The inner diameter of the ring array formed by the several axial sliding keys (51) is smaller than the outer diameter of the upper pen tube (1) and not smaller than the diameter at the bottom wall of the axial keyway (16). The axial sliding keys (51) can slide axially in the axial keyway (16) in a corresponding match. The sliding stroke of the axial sliding key (51) in the axial keyway (16) is the same as the distance between the upper pawl (431) and the lower pawl (432).
6. The novel telescopic ballpoint pen as described in claim 5, characterized in that: A push plate (421) is coaxially disposed at the lower end of the pen tip rod (42). The diameter of the push plate (421) is larger than the diameter of the pen tip (3) and smaller than the inner diameter of the upper pen tube (1) and the lower pen tube (2). An annular groove (422) is formed on the outer axial surface of the upper end of the pen tip rod (42). Furthermore, the upper end of the pen tip rod (42) located in the annular groove (422) is provided with a round head or a conical head structure. A connecting rod is axially protruding on the side wall of the upper end of the pen cap (5) towards the inside of the pen cap (5). The inner diameter of the connecting tube (52) matches the diameter of the pen tip rod (42). The inner wall of the connecting tube (52) is provided with an annular retaining rib (53) that matches the annular retaining groove (422). The upper end of the pen tip rod (42) is inserted into the connecting tube (52). The annular retaining rib (53) is engaged in the annular retaining groove (422). The distance between the lower end face of the connecting tube (52) and the upper end face of the push plate (421) matches the length of the rotary tube (43).
7. The novel telescopic ballpoint pen as described in claim 6, characterized in that: On the two sides of the upper end of the rotary tube (43), there are corresponding cuts (44) that extend axially upward and penetrate the tube wall. The two cuts (44) divide the upper end of the rotary tube (43) into two halves. The two upper pawls (431) are located on the upper end of the two halves of the tube wall. The axial length of the cut (44) is not less than half the length of the rotary tube (43), and the width of the cut (44) is not less than twice the radial height of the upper pawl (431).