Press type pen
By designing a sealing device that connects the refill core and the movable frame in a press-moving pen, the switching action of the sealing cover is controlled, and the problem of easy damage to the pen tip is solved, which improves the service life and writing convenience of the pen.
Patent Information
- Application Number
- CN202323283046.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-04
AI Technical Summary
The sealing cover in the existing push-moving pen needs to be opened through the pen tip, which can easily damage the pen tip and affect the service life of the pen.
A press-moving pen including a pen tip sealing device is designed, and the opening and closing of the sealing cover is controlled through the refill core and the operation of directly opening the sealing cover is avoided. The device includes a cage, a movable rack and a sealing cylinder. The sealing cover is turned on and opened through the movable rack. The refill core moves up and down to drive the switch of the sealing cover to ensure that the pen tip is covered when retracted and reduces ink volatility.
It effectively reduces the damage to the pen tip, improves the service life of the pen, and improves the convenience of writing and the moisturization of the ink through the linkage of the refill and the sealing cover.
Smart Images
Figure CN222136299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pens, in particular to a push-type fountain pen. Background Art
[0002] A fountain pen is a common writing tool. A push-type fountain pen is a fountain pen that controls the nib to extend and retract from the nib outlet of the pen housing by pressing. Since the ink at the nib will evaporate and dry after the fountain pen is not used for a period of time, the ink cannot flow down the nib, thereby affecting writing. In this regard, a fountain pen that can be pressed in and out of the nib is disclosed in patent document CN217705291U. By adding a rotatable sealing cover to the writing end of the fountain pen, when writing is needed, the sleeve is driven to move by the push rod, and the sleeve drives the nib to move outward. When the nib hits the sealing cover, a torque is generated between the force applied by the nib to the sealing cover and the axis of rotation of the sealing cover, so that the sealing cover is flipped so that the nib can extend from the writing end. In this patent document, a sealing cover is set to cover the writing end, thereby preventing the nib ink from evaporating. However, in the above patent document, the sealing cover needs to be directly pushed open by the nib, which is easy to damage the nib of the fountain pen, thereby affecting the service life of the fountain pen. Utility Model Content
[0003] The technical problem to be solved by the utility model is that the sealing cover in the existing push-type fountain pen needs to be pushed open by the pen tip, which easily causes damage to the pen tip and further affects the service life of the fountain pen, thereby providing a push-type fountain pen.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] The utility model provides a push-type fountain pen, comprising a pen case with a pen tip outlet at the lower end, a pen core arranged in the pen case and movable up and down, and a pen tip sealing device arranged at the lower end of the pen case; a pen tip is arranged at the lower end of the pen core, the pen tip sealing device is a hollow structure, and the lower end of the pen core extends into the pen tip sealing device;
[0006] The nib sealing device comprises a retaining frame, a movable frame and a sealing cylinder. The retaining frame is positioned in the pen case, the movable frame can move up and down relative to the retaining frame and is linked with the pen core. The sealing cylinder is a vertical through structure, which is sleeved and positioned at the lower end of the retaining frame. The lower end of the movable frame extends into the sealing cylinder and is connected with a sealing cover. In normal state: the nib is in the nib sealing device, the sealing cover is in the sealing cylinder below the nib, and closes the lower end opening of the sealing cylinder, and the sealing cover is closed at this time; when the pen core moves downward and drives the movable frame to move downward, the sealing cover is driven by the movable frame to extend from the lower end of the sealing cylinder and then flipped downward to open, so that the nib extends out of the lower end of the sealing cylinder and the nib outlet, and the sealing cover is closed by the movable frame when the pen core moves upward and retracts.
[0007] In some embodiments, the retainer is provided with a first guide groove and two second guide grooves respectively located on both sides of the first guide groove in the circumferential direction;
[0008] The movable frame has a limiting arm in the first guide groove and two driving arms in the two second guide grooves respectively in the circumferential direction, the driving arm is linked with the pen core and can move up and down with the pen core, the limiting arm is linked with the pen core and can move up and down relative to the pen core, the lower ends of the limiting arm and the driving arm extend into the sealing tube and are connected to the circumference of the sealing cover through the first flexible part and the second flexible part respectively;
[0009] A first stop that can abut against the upper end of the sealing cylinder is provided on the outside of the limiting arm, and a second stop that can abut against the upper end of the sealing cylinder is provided on the outside of the driving arm, and the height of the first stop is lower than that of the second stop; when the pen core moves downward and drives the movable frame to move downward, when the first stop abuts against the sealing cylinder, the sealing cover extends out from the opening at the lower end of the sealing cylinder and continues to press the pen core downward, and the driving arm pushes the sealing cover to flip downward relative to the limiting arm until the second stop abuts against the sealing cylinder, so that a gap is formed between the sealing cover and the lower end of the sealing cylinder, thereby opening the sealing cover.
[0010] In some embodiments, a positioning card platform is provided at the upper end of the driving arm, and a positioning card slot cooperating with the positioning card platform is provided on the outer wall of the pen core. The positioning card platform cooperates with the positioning card slot to position and connect the driving arm and the pen core.
[0011] In some embodiments, a limiting boss is provided at the upper end of the limiting arm, and a limiting groove slidably matched with the limiting boss is provided on the outer wall of the pen core. When the limiting arm moves up and down relative to the pen core, the limiting boss moves up and down in the limiting groove.
[0012] In some embodiments, a guide boss is provided on the outer wall of the pen core, and a guide groove cooperating with the guide boss is provided on the retaining frame, and the guide groove is a strip groove arranged along the axial direction of the pen core.
[0013] In some embodiments, the driving arm, the limiting arm, the first flexible portion, the second flexible portion and the sealing cover are an integrated structure.
[0014] In some embodiments, the width of the first flexible portion is smaller than the width of the limiting arm, and the width of the second flexible portion is smaller than the width of the driving arm.
[0015] In some embodiments, the sealing cover includes a circular bottom wall and a convex ring portion arranged around the upper periphery of the circular bottom wall, and the first flexible portion and the second flexible portion are connected to the upper end of the convex ring portion.
[0016] In some embodiments, the two second flexible portions are centrally symmetrically arranged about the center of the sealing cover.
[0017] In some embodiments, the first guide groove and the second guide groove are axial grooves with an open lower end and a closed upper end, and the upper end of the second guide groove forms an abutting surface that abuts against the upper end of the limiting arm when the sealing cover is in a closed state.
[0018] The utility model has the positive effects that the structure of the push-type fountain pen in the utility model is optimized, and the pen tip is covered by the pen tip sealing device when the pen tip is retracted, thereby reducing the volatilization of ink from the pen tip and improving the convenience of use, and the opening of the sealing cover is controlled by a movable frame linked to the pen core, rather than being pushed open by the pen tip, which can reduce the damage to the pen tip and improve the service life of the fountain pen; and when the structure of the utility model is adopted, when assembling the fountain pen, the pen tip sealing device can be assembled and then installed in the pen shell as a whole, so that the assembly operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 It is a structural schematic diagram of the push-type fountain pen in the utility model;
[0021] Figure 2 for Figure 1 An exploded view of a medium-press fountain pen (the nib extends into the nib seal);
[0022] Figure 3 for Figure 2 Another exploded view of the click pen shown;
[0023] Figure 4 It is a partial view of the lower part of the pen core in the utility model;
[0024] Figure 5 It is a three-dimensional structural schematic diagram of the pen tip sealing device in the utility model;
[0025] Figure 6 for Figure 5 A front view of the nib seal;
[0026] Figure 7 For along Figure 6 Sectional view cut along line AA;
[0027] Figure 8for Figure 6 A right side view of the nib seal shown in;
[0028] Fig. 9 For along Figure 8 Sectional view cut along the midline BB;
[0029] Fig.10 It is a structural schematic diagram of the retainer in the utility model;
[0030] Fig.11 for Fig.10 A schematic structural diagram of another perspective of the cage shown in FIG.
[0031] Fig.12 It is a structural schematic diagram of the movable frame in the utility model;
[0032] Fig.13 for Fig.12 A structural schematic diagram of another perspective of the movable frame shown in FIG.
[0033] Fig.14 It is a cross-sectional view of the pen tip sealing device (the sealing cover is in an open state) in the utility model.
[0034] Reference numerals shown in the figure: 1-pen case; 10-pen tip outlet; 11-upper shell; 12-lower shell; 2-pen core; 20-pen tip; 21-positioning slot; 22-limiting slide groove; 23-guide boss; 3-pen tip sealing device; 30-gap; 31-retaining frame; 310-guide slide groove; 311-first guide groove; 3111-abutment surface; 312-second guide groove; 32-movable frame; 321-limiting arm; 3211-first stop; 3212-limiting boss; 322-driving arm; 3221-second stop; 3222-positioning card platform; 323-first flexible part; 324-second flexible part; 33-sealing cylinder; 34-sealing cover; 341-circular bottom wall; 342-convex ring part. DETAILED DESCRIPTION
[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present utility model are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the present utility model, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0037] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.
[0038] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0039] The push-type fountain pen in this embodiment, such as Figures 1 to 14 As shown. It comprises a pen case 1 with a nib outlet 10 at the lower end, a pen core 2 disposed in the pen case 1 and movable up and down, and a nib sealing device 3 disposed at the lower end of the pen case 1. The nib sealing device 3 can be positioned inside the pen case 1 by means of snap connection, interference fit, etc.; a nib 20 is disposed at the lower end of the pen core 2. When in use, the nib 20 of the pen core 2 is controlled to extend downward out of the nib outlet 10, so that writing can be performed; the nib sealing device 3 is a hollow structure, the lower end of the pen core 2 extends into the nib sealing device 3, and after the nib 20 is retracted into the nib outlet 10, the nib 10 is covered by the nib sealing device 3, so that the evaporation of ink at the nib can be reduced, the nib can be kept moist, and the convenience of writing can be improved.
[0040] The nib sealing device 3 in this embodiment includes a retaining frame 31, a movable frame 32 and a sealing cylinder 33. The retaining frame 31 is positioned in the pen shell 1, and the movable frame 32 can move up and down relative to the retaining frame 31 and is linked with the pen core 2. The sealing cylinder 33 is a vertical through structure, which is sleeved and positioned at the lower end of the retaining frame 31. The lower end of the movable frame 32 extends into the sealing cylinder 33 and is connected with a sealing cover 34. In normal state: the nib 20 is in the nib sealing device 3, and the sealing cover 34 is in the sealing cylinder 33 below the nib 20, and closes the lower end opening of the sealing cylinder 33, and the sealing cover 34 is closed at this time; when the pen core 2 moves downward and drives the movable frame 32 to move downward, the sealing cover 34 is driven by the movable frame 32 to extend from the lower end of the sealing cylinder 33 and then flipped downward to open, so that the nib 20 extends out of the lower end of the sealing cylinder 33 and the nib outlet 10, and the sealing cover 34 is closed by the movable frame 32 during the upward movement and retraction of the pen core 2.
[0041] With the structure of the present embodiment, in normal state (i.e. the pen tip is retracted), the sealing cover 34 is closed to seal the lower end of the sealing tube 33. In the process of controlling the pen core 2 to move downward by pressing, the movable frame 32 is driven to move and thus control the sealing cover 34 to move downward and extend out of the lower end of the sealing tube 33, and then flip downward to open, allowing the pen tip to extend.
[0042] Specifically, the retaining frame 31 is circumferentially provided with a first guide groove 311 and two second guide grooves 312 respectively located on both sides of the first guide groove 311; the movable frame 32 is circumferentially provided with a limiting arm 321 located in the first guide groove 311 and two driving arms 322 respectively located in the two second guide grooves 312, the driving arm 322 is connected to the refill 2 and can move up and down with the refill 2, the limiting arm 321 is connected to the refill 2 and can move up and down relative to the refill 2, the lower ends of the limiting arm 321 and the driving arm 322 extend into the sealing tube 33 and are respectively connected to the peripheral edge of the sealing cover 34 through the first flexible portion 323 and the second flexible portion 324, the first flexible portion 323 and the second flexible portion 324 have good flexibility, so that the driving arm 322 can flexibly swing relative to the sealing cover 34, and the limiting arm 321 can flexibly swing relative to the sealing cover 34.
[0043] The limiting arm 321 is provided with a first stopper 3211 on the outside that can abut against the upper end of the sealing cylinder 33, and the driving arm 322 is provided with a second stopper 3221 on the outside that can abut against the upper end of the sealing cylinder 33, and the height of the first stopper 3211 is lower than the height of the second stopper 3221; when the pen core 2 moves downward and drives the movable frame 32 to move downward, when the first stopper 3211 abuts against the sealing cylinder 33, the sealing cover 34 extends out from the opening at the lower end of the sealing cylinder 33 and continues to press the pen core 2 downward, and the driving arm 322 pushes the sealing cover 34 to flip downward relative to the limiting arm 321 until the second stopper 3221 abuts against the sealing cylinder 33, so that a gap 30 is formed between the sealing cover 34 and the lower end of the sealing cylinder 33, thereby opening the sealing cover 34.
[0044] The limiting arm 321 is provided with a first stopper 3211 on the outside that can abut against the upper end of the sealing tube 33, and the driving arm 322 is provided with a second stopper 3221 on the outside that can abut against the upper end of the sealing tube 33. The height of the first stopper 3211 is lower than the height of the second stopper 3221, so that when the movable frame 32 moves downward with the pen core 2, the first stopper 3211 abuts against the upper end of the sealing tube 33 before the second stopper 3221. In normal state: the pen tip 20 is in the pen tip sealing device 3, the sealing cover 34 is in the sealing tube 33 below the pen tip 20, and the sealing cover 34 closes the lower end opening of the sealing tube 33 (such as Figure 7 When the refill 2 is pressed downward, the movable frame 32 is driven to move downward. When the first stop 3211 abuts against the sealing cylinder 33, the sealing cover 34 extends out from the lower end opening of the sealing cylinder 33. The refill 2 is pressed downward continuously. The driving arm 322 pushes the sealing cover 34 to flip downward relative to the limiting arm 321 until the second stop 3221 abuts against the sealing cylinder 33, so that a gap 30 is formed between the sealing cover 34 and the lower end of the sealing cylinder 33 (as shown in FIG. 2 ). Fig.14 As shown), the pen tip 20 passes through the gap 30 and emerges from the pen tip outlet 10.
[0045] When the refill 2 is in the normal state (i.e. the refill 2 is retracted into the pen housing 1), the pen tip 20 is in the sealing tube 33 of the pen tip sealing device 3, and the lower end opening of the sealing tube 33 is closed by the sealing cover 34 (the sealing cover 34 is in the closed state at this time), thereby closing the pen tip 20. In this state, the ink on the pen tip 20 is not easy to evaporate, and can be kept moist for a long time, which is convenient for writing. When writing is needed, the refill 2 is controlled to move downward, and at the same time, the movable frame 32 is driven to move downward together. When the first stop 321 abuts against the upper end of the sealing tube 33, the limiting arm 321 cannot move downward. At this time, the sealing cover 34 extends downward from the sealing tube 33. As the refill 2 continues to move downward, the driving arm 322 continues to move downward and pushes the sealing cover 34 to flip downward relative to the limiting arm 321. When the second stop 3221 abuts against the upper end of the sealing tube 33, a gap 30 is formed between the sealing cover 34 and the lower end of the sealing tube 33 (the sealing cover 34 is in the open state at this time, as shown in FIG. 2 ). Fig.14 As shown in the figure, at the same time, the pen tip 20 passes through the gap 30 and the pen tip outlet 10 for writing; after the pen is used, the pen core 2 is controlled to move upward, driving the driving arm 322 to move upward. During this process, the pen tip 20 is retracted into the sealing tube 33, and the sealing cover 34 is driven by the driving arm 322 to flip upward to the initial angle relative to the limiting arm 321 (the sealing cover 34 is in a closed state at this time), and then driven by the pen core 20 to move upward into the sealing tube 33. When assembling a fountain pen using the structure in this embodiment, the pen tip sealing device 3 can be assembled and then installed in the pen case 1 as a whole, and the assembly operation is convenient.
[0046] In this embodiment, the sealing cylinder 33 is sleeved on the outer portion of the lower end of the retaining frame 31 and buckled, so that the sealing cylinder 33 is installed on the retaining frame 31 .
[0047] In order to facilitate the assembly of the push-type fountain pen in this embodiment, the pen shell 1 in this embodiment adopts a split assembly structure, including an upper shell 11 and a lower shell 12. The lower end of the upper shell 11 is screwed or snap-fitted with the upper end of the lower shell 12, and the pen tip sealing device 3 is installed in the lower shell 12.
[0048] Furthermore, a positioning ridge is provided in the pen housing 1 (specifically the lower housing 12), and a positioning groove is provided on the retaining frame 31. The retaining frame 31 can be positioned in the lower housing 12 by the cooperation between the positioning groove and the positioning ridge, so as to prevent the nib sealing device 3 from rotating in the pen housing 1, and play a guiding role when the nib sealing device 3 is installed in the lower housing 12; as a variation, the positions of the positioning ridge and the positioning groove are interchangeable.
[0049] See also Figure 8 , Fig. 9 , Fig.12 and Fig.13As shown, a positioning base 3222 is provided at the upper end of the driving arm 322, and a positioning slot 21 cooperating with the positioning base 3222 is provided on the outer wall of the pen core 2. The positioning base 3222 cooperates with the positioning slot 21 to position and connect the driving arm 322 to the pen core 2, which facilitates assembly and drives the driving arm 322 to move up and down when the pen core 2 moves up and down.
[0050] like Figure 4-Figure 7 As shown, a limiting boss 3212 is provided on the upper end of the limiting arm 321, and a limiting groove 22 slidably matched with the limiting boss 3212 is provided on the outer wall of the pen core 2. When the limiting arm 321 moves up and down relative to the pen core 2, the limiting boss 3212 moves up and down in the limiting groove 22. In this way, in the process of controlling the pen core 2 to move downward, when the first stop 3211 abuts against the upper end of the sealing tube 33, as the pen core 2 continues to move downward, the driving arm 322 continues to move downward with the pen core, and the limiting arm 321 stops moving downward, and the limiting boss 3212 will produce relative movement in the limiting groove 22.
[0051] like Figure 3 , Fig. 9 and Fig.10 As shown, a guide boss 23 is provided on the outer wall of the refill 2, and a guide slot 310 cooperating with the guide boss 23 is provided on the retaining frame 31. The guide slot 310 is a strip slot arranged along the axial direction of the refill 2. The guide slot 310 cooperates with the guide boss 23 to play a circumferential positioning role between the retaining frame 31 and the refill 2, thereby preventing the two from circumferential rotation.
[0052] In some embodiments, Fig.12 and Fig.13 As shown, the driving arm 322, the limiting arm 321, the first flexible portion 323, the second flexible portion 324 and the sealing cover 34 are an integrated structure, which can simplify the structure and facilitate production by integral injection molding. The material can be nylon.
[0053] For further information, see Figure 7 and Fig.12 As shown, the width of the first flexible portion 323 is smaller than the width of the limiting arm 321, and the width of the second flexible portion 324 is smaller than the width of the driving arm 322; this arrangement allows the first flexible portion 323 to be easily deformed relative to the limiting arm 321, and the second flexible portion 324 to be easily deformed relative to the driving arm 322, so as to adapt to the flexible opening and closing of the sealing cover 34 when the pen core 2 moves up and down.
[0054] In some embodiments, Fig.13As shown, the sealing cover 34 includes a circular bottom wall 341 and a convex ring portion 342 arranged around the upper periphery of the circular bottom wall 341, and the first flexible portion 323 and the second flexible portion 324 are connected to the upper end of the convex ring portion 342, so that a groove can be formed on the upper part of the sealing cover 34, and the groove can accommodate ink dripping from the pen tip, and when the pen tip 20 is retracted and the sealing cover 34 is closed, the groove can increase the distance between the circular bottom wall 341 and the lower end of the pen tip 20 to avoid the pen tip from touching.
[0055] In order to ensure that the driving arm 322 can effectively drive the sealing cover 34 to flip when it moves up and down with the pen core 2, two second flexible parts 324 are arranged symmetrically about the center of the sealing cover 34, so that when the pen core 2 moves, the two sides of the sealing cover 34 are balanced, and the flipping action is smoother.
[0056] In a further embodiment, the first guide groove 311 and the second guide groove 312 are axial grooves which are open at the lower end and closed at the upper end. The upper end of the second guide groove 312 forms an abutting surface 3111 which abuts against the upper end of the limiting arm 321 when the sealing cover 34 is in the closed state. With this structure, when the pen core 2 moves upward to reset, the upper end of the limiting arm 321 can abut against the abutting surface 3111 so that the sealing cover 34 can be flipped from the open state to the closed state.
[0057] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A push-type fountain pen, comprising a pen case (1) with a pen tip outlet (10) at the lower end, a pen core (2) disposed in the pen case (1) and movable up and down, and a pen tip sealing device (3) disposed at the lower end of the pen case (1); a pen tip (20) is disposed at the lower end of the pen core (2), the pen tip sealing device (3) is a hollow structure, and the lower end of the pen core (2) extends into the pen tip sealing device (3); It is characterized in that The pen tip sealing device (3) comprises a retaining frame (31), a movable frame (32) and a sealing cylinder (33). The retaining frame (31) is positioned in the pen housing (1). The movable frame (32) can move up and down relative to the retaining frame (31) and is linked with the pen core (2). The sealing cylinder (33) is a vertical through structure, which is sleeved and positioned at the lower end of the retaining frame (31). The lower end of the movable frame (32) extends into the sealing cylinder (33) and is connected to a sealing cover (34). In normal state, the pen tip (20) is in the pen tip sealing device (3). The sealing cover (34) is in a closed position. 4) is located in the sealing tube (33) below the pen tip (20) and closes the lower opening of the sealing tube (33), at which time the sealing cover (34) is closed; when the pen core (2) moves downward and drives the movable frame (32) to move downward, the sealing cover (34) is driven by the movable frame (32) to extend from the lower end of the sealing tube (33) and then flipped downward to open, so that the pen tip (20) extends out of the lower end of the sealing tube (33) and the pen tip outlet (10), and when the pen core (2) moves upward and retracts, the sealing cover (34) is driven to close by the movable frame (32).
2. The click-type fountain pen according to claim 1, characterized in that: The retaining frame (31) is provided with a first guide groove (311) and two second guide grooves (312) respectively located on both sides of the first guide groove (311) in the circumferential direction; The movable frame (32) has a limiting arm (321) located in the first guide groove (311) and two driving arms (322) located in the two second guide grooves (312) in the circumferential direction; the driving arm (322) is connected to the pen core (2) and can move up and down with the pen core (2); the limiting arm (321) is connected to the pen core (2) and can move up and down relative to the pen core (2); the lower ends of the limiting arm (321) and the driving arm (322) extend into the sealing tube (33) and are connected to the circumference of the sealing cover (34) through the first flexible portion (323) and the second flexible portion (324) respectively; The limiting arm (321) is provided with a first stopper (3211) capable of abutting against the upper end of the sealing cylinder (33) on the outside, and the driving arm (322) is provided with a second stopper (3221) capable of abutting against the upper end of the sealing cylinder (33) on the outside, and the height of the first stopper (3211) is lower than the height of the second stopper (3221); when the pen core (2) moves downward and drives the movable frame (32) to move downward, when the first stopper (3211) abuts against the sealing cylinder (33), the sealing cover (34) extends out from the opening at the lower end of the sealing cylinder (33), continues to press the pen core (2) downward, and the driving arm (322) pushes the sealing cover (34) to flip downward relative to the limiting arm (321) until the second stopper (3221) abuts against the sealing cylinder (33), so that a gap (30) is formed between the sealing cover (34) and the lower end of the sealing cylinder (33), thereby opening the sealing cover (34).
3. The click-type fountain pen according to claim 2, characterized in that: A positioning card platform (3222) is provided at the upper end of the driving arm (322), and a positioning card slot (21) cooperating with the positioning card platform (3222) is provided on the outer wall of the pen core (2); the positioning card platform (3222) cooperates with the positioning card slot (21) to position and connect the driving arm (322) and the pen core (2).
4. The click-type fountain pen according to claim 2, characterized in that: A limiting boss (3212) is provided at the upper end of the limiting arm (321), and a limiting slide groove (22) slidably matched with the limiting boss (3212) is provided on the outer wall of the pen core (2); when the limiting arm (321) moves up and down relative to the pen core (2), the limiting boss (3212) moves up and down in the limiting slide groove (22).
5. The click-type fountain pen according to claim 1, characterized in that: A guide boss (23) is provided on the outer wall of the pen core (2), and a guide slot (310) cooperating with the guide boss (23) is provided on the retaining frame (31), wherein the guide slot (310) is a strip-shaped slot arranged along the axial direction of the pen core (2).
6. The click-type fountain pen according to claim 2, characterized in that: The driving arm (322), the limiting arm (321), the first flexible portion (323), the second flexible portion (324) and the sealing cover (34) are an integrated structure.
7. The click-type fountain pen according to claim 6, characterized in that: The width of the first flexible portion (323) is smaller than the width of the limiting arm (321), and the width of the second flexible portion (324) is smaller than the width of the driving arm (322).
8. The click-type fountain pen according to claim 2, characterized in that: The sealing cover (34) comprises a circular bottom wall (341) and a convex ring portion (342) arranged around the upper periphery of the circular bottom wall (341), and the first flexible portion (323) and the second flexible portion (324) are connected to the upper end of the convex ring portion (342).
9. The push-type fountain pen according to any one of claims 2 to 8, characterized in that: The two second flexible portions (324) are centrally symmetrically arranged about the center of the sealing cover (34).
10. The push-type fountain pen according to any one of claims 2 to 4 and 6 to 8, characterized in that: The first guide groove (311) and the second guide groove (312) are axial grooves with an open lower end and a closed upper end, and the upper end of the second guide groove (312) forms an abutment surface (3121) that abuts against the upper end of the limiting arm when the sealing cover (34) is in a closed state.