A gel pen

Abstract

The present invention provides a gel pen, which comprises a pen barrel. At least two gel pen refills are arranged inside the pen barrel. For each gel pen refill inside the pen barrel, a set of driving components is arranged. Each set of driving components includes a pen refill transmission member and a transmission member limiting structure. The pen refill transmission member is connected to the tail end of the gel pen refill. A manual part extending outside the pen barrel is further arranged on the pen refill transmission member. The manual part is used to drive the pen refill transmission member to slide along the pen barrel. The pen refill transmission member is used to drive the gel pen refill to extend out or retract from the tip of the pen barrel. The transmission member limiting structure is used to limit the pen refill transmission member, so that the gel pen refill maintains the state of extending out of the tip or retracting inside the tip. By applying the gel pen of the present invention, a two-color or multi-color gel pen can be realized by using a general gel pen refill, without using a refill with a special design structure, which is convenient to use.

Description

Technical Field

[0001] The present invention relates to the technical field of stationery, and more precisely, to a gel pen. Background Art

[0002] Roller ball pens, abbreviated as gel ball pens, combine the advantages of fountain pens and ballpoint pens with oil-based ink. They have a comfortable writing feel, a relatively low viscosity of the ink, and substances that make it easier to lubricate. The viscosity of the writing medium is between that of water-based and oil-based, making them smoother than ordinary oil-based ballpoint pens. They are an upgraded version of oil-based ballpoint pens. Oil-based ballpoint pens can be made into multi-color pens. Each oil-based refill is sleeved with a spring, and the oil-based refill is provided with protrusions for clamping the spring. Several sliding grooves are provided on the pen barrel, and each sliding groove is provided with a sliding piece. The sliding piece is in contact with the tail ends of the oil-based refills of each color one by one. Pressing the sliding piece can make the corresponding oil-based refill extend out of the pen tip of the pen barrel. The common gel pen refills are thicker than oil-based refills, have a smooth surface and no protrusion structure, cannot clamp the spring, and cannot adopt the structure of traditional multi-color oil-based ballpoint pens. Therefore, the click-action gel pens using common gel pen refills are all single-core gel pens and cannot achieve the smooth conversion between two cores or multiple cores. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a gel pen that uses two or more common gel pen refills and can make two or more common gel pen refills alternately extend out of the pen tip of the pen barrel, and can achieve a two-color or multi-color gel pen using common gel pen refills.

[0004] The technical solution of the present invention is to provide a gel pen, which includes a pen barrel. At least two gel pen refills are arranged in the pen barrel. A set of driving components is arranged in the pen barrel for each gel pen refill. Each set of driving components includes a pen refill transmission part and a transmission part limiting structure. The pen refill transmission part is connected to the tail end of the gel pen refill. A manual part extending outside the pen barrel is also arranged on the pen refill transmission part. The manual part is used to drive the pen refill transmission part to slide along the pen barrel. The pen refill transmission part is used to drive the gel pen refill to extend out or retract from the pen tip of the pen barrel. The transmission part limiting structure includes a first structure arranged on the pen refill transmission part and a second structure and a third structure arranged on the pen barrel. The second structure is located between the pen tip of the pen barrel and the third structure. After the gel pen refill extends out of the pen tip of the pen barrel, the second structure is used to cooperate with the first structure to limit the pen refill transmission part. After the gel pen refill retracts from the pen tip of the pen barrel, the third structure is used to cooperate with the first structure to limit the pen refill transmission part.

[0005] Compared with the prior art, the gel pen of the present invention has the following advantages: at least two gel pen refills are arranged in the pen barrel, and a set of driving components composed of a pen refill driving part and a driving part limiting structure are arranged in the pen barrel for each gel pen refill. The pen refill driving part is connected to the tail end of the gel pen refill, driving the gel pen refill to extend or retract from the tip of the pen barrel. A common gel pen refill can be used to realize a two-color or multi-color gel pen without using a refill with a special design structure. The pen refill driving part is driven by a manual part to slide along the pen barrel. After the gel pen refill extends from the tip of the pen barrel, the second structure can cooperate with the first structure to limit the pen refill driving part, and at this time, the refill can be prevented from retracting to ensure stable writing. After the gel pen refill retracts from the tip of the pen barrel, the third structure can cooperate with the first structure to limit the pen refill driving part, and at this time, it can be ensured that the gel pen refill corresponding to the limited pen refill driving part will not slide out of the tip to interfere with the selection of the next refill. In this way, any other refill can be selected to make its core come out from the tip of the pen barrel, which is convenient to use.

[0006] Preferably, a clamping rod is arranged on the pen refill driving part. The connection between the clamping rod and the pen refill driving part has elasticity. The first structure is a limiting block arranged on the clamping rod. In the natural state, the distance between the limiting block and the central axis of the pen barrel is greater than the cross-sectional radius of the pen barrel. The second structure and the third structure are both grooves arranged on the inner side wall of the pen barrel. One side of the second structure and the third structure is provided with an opening, and the opening is used for the limiting block to enter or exit the corresponding groove. With this structure, the distance between the limiting block and the central axis of the pen barrel is greater than the cross-sectional radius of the pen barrel. In the natural state, the limiting block elastically abuts against the inner side wall of the pen barrel. When the limiting block enters the opening of the second structure or the opening of the third structure, the clamping rod rebounds, and the limiting block is limited by the second structure or the third structure, ensuring that the pen refill driving part is limited and will not slide by itself. The opening is provided to make it easy for the limiting block to enter or exit the second structure or the third structure.

[0007] Preferably, the driving part limiting structure further includes a clamping rod sliding groove arranged on the side wall of the pen barrel. The second structure and the third structure are respectively grooves communicated with the clamping rod sliding groove, that is, the core-out limiting bayonet and the core-in limiting bayonet. The limiting block is limited to slide in the clamping rod sliding groove and can be respectively limited by the core-out limiting bayonet and the core-in limiting bayonet. With this structure, the second structure and the third structure are respectively communicated with the clamping rod sliding groove. The limiting block is limited to slide in the clamping rod sliding groove, which is convenient for the limiting block to enter or exit from the second structure or the third structure. When the limiting block is clamped by the core-out limiting bayonet, the refill can be prevented from retracting at this time to ensure stable writing. When the limiting block is clamped by the core-in limiting bayonet, it can be ensured that the gel pen refill corresponding to the limited pen refill driving part will not slide out of the tip to interfere with the selection of the next refill.

[0008] Preferably, the end face of the limit block is provided with a clamping surface for cooperating with the core-out limit bayonet and the core-in limit bayonet, and the side surface of the limit block is provided with an inclined surface for avoiding the core-out limit bayonet and the core-in limit bayonet. With this structure, the inclined surface provided on the side surface of the limit block makes it easy for the limit block to withdraw from the core-out limit bayonet or the core-in limit bayonet, and the clamping surface provided on the end face of the limit block enables reliable clamping between the limit block and the core-out limit bayonet or the core-in limit bayonet.

[0009] Preferably, each set of driving components further includes an elastic member and an elastic member limiting structure arranged in the pen barrel. The elastic member limiting structure is a structure integrated with the pen barrel or an independent structure limited by the inner side wall of the pen barrel. The elastic member is arranged between the elastic member limiting structure and the refill driving member and can expand and contract along the length direction of the pen barrel. When the refill driving member pushes the neutral pen refill out from the tip of the pen barrel, the elastic member is compressed, and the elastic member can rebound to push the refill driving member to drive the neutral pen refill to retract from the tip of the pen barrel. With this structure, the manual part is used to drive the refill driving member to push the neutral pen refill out of the core, and the elastic member is used to drive the refill driving member to drive the neutral pen refill to retract, which is convenient to operate.

[0010] Preferably, the elastic member limiting structure is an independent structure limited by the inner side wall of the pen barrel. The elastic member limiting structures can be mutually joined together in pairs. The outer dimension of the cross-section of all the elastic member limiting structures after being completely joined together matches the inner dimension of the cross-section of the pen barrel. A splicing hole for the neutral pen refill to pass through is provided between every two of the elastic member limiting structures. With this structure, the elastic member limiting structures can be joined together to form a regular whole, and the neutral pen refill passes through the splicing position between every two of the elastic member limiting structures, which is convenient for assembly.

[0011] Preferably, the structures on the side of the refill driving member opposite to the elastic member can be mutually joined together in pairs. The outer dimension of the cross-section of all the structures on the side of the refill driving member opposite to the elastic member after being completely joined together matches the inner dimension of the cross-section of the pen barrel. A splicing hole for the neutral pen refill to pass through is provided between every two of the structures on the side of the refill driving member opposite to the elastic member. With this structure, the refill driving members can be joined together to form a regular whole, and the neutral pen refill passes through the splicing position between every two of the refill driving members, which is convenient for assembly, and the refill driving members can also ensure mutual avoidance between each other.

[0012] Preferably, a refill connecting part is arranged on the refill driving member. One side of the refill connecting part is connected to the tail end of the neutral pen refill, and the other side is in contact connection with the manual part and is provided with a limit convex block. A limiting surface is provided at the part of the manual part in contact with the refill connecting part. The limit convex block cooperates with the limiting surface of the manual part to limit the manual part. With this structure, the limit convex block cooperates with the limiting surface of the manual part to limit the manual part, which can prevent sliding between the manual part and the corresponding refill driving member, thus affecting the driving effect of the manual part on the corresponding neutral pen refill.

[0013] Preferably, the refill connecting portion is provided with a plugging convex block or a plugging groove for connecting with the tail end of the gel pen refill. When the plugging convex block is provided, the plugging convex block is inserted into the tail end of the gel pen refill core tube and has an interference fit; when the plugging groove is provided, the tail end of the gel pen refill core tube is inserted into the plugging groove and has an interference fit. With this structure, whether the plugging convex block is inserted into the tail end of the gel pen refill core tube and has an interference fit, or the tail end of the gel pen refill core tube is inserted into the plugging groove and has an interference fit, it can ensure that the connection between the tail end of the gel pen refill and the refill driving member is firm and not easy to fall off, and ensure that the refill driving member can drive the gel pen refill to extend out of the pen tip or retract into the pen tip.

[0014] Preferably, a pen clip is further provided on the pen barrel, and the pen barrel limits the pen clip. The manual part corresponding to one of the refill driving members is arranged on the pen clip and can slide along the pen clip. A sliding groove is provided on the pen barrel and is matched with the manual part on the pen clip. The manual part arranged on the pen clip extends into the sliding groove and is connected with the corresponding refill driving member. With this structure, if there are only two refills in the pen barrel, one corresponding manual part can be arranged at the end of the pen barrel, and the other manual part is arranged on the pen clip. The appearance of this gel pen is basically the same as that of an ordinary single-core automatic gel pen. The manual part will not protrude obtrusively on the outer side wall of the pen barrel, avoiding the exposure of the sliding groove on the pen barrel that is matched with the manual part and affecting the appearance. The structure is delicate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the gel pen of the present invention.

[0016] Figure 2 is Figure 1 an exploded view of

[0017] Figure 3 is an enlarged schematic view of two refill driving members in the gel pen of the present invention.

[0018] Figure 4 is an enlarged schematic view of the first pressing part and the second pressing part in the gel pen of the present invention.

[0019] Figure 5 is an enlarged schematic view of the pen barrel and the pen clip in the gel pen of the present invention.

[0020] As shown in the figure: 1. Pen barrel, 1-1. Clip connection groove, 1-2. Snap rod chute, 1-21. Core retraction limit bayonet, 1-22. Core extension limit bayonet, 1-3. Second pressing part chute I, 1-4. Sheath rib, 2. Nib, 3. Sheath, 3-1. Connection hole, 4. First pressing part, 4-1. First limit surface, 5. Second pressing part, 5-1. Second limit surface, 6. Clip, 6-1. Snap block, 6-2. Second pressing part chute II, 7. Refill drive part, 7-1. Snap rod, 7-11. Limit block, 7-2. Refill connection part, 7-21. Limit projection, 8. Spring limit part, 9. Spring, 10. Gel pen refill. Detailed implementation mode

[0021] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0022] In the drawings, for the sake of clarity, the thickness, dimensions and shapes of the objects have been slightly exaggerated. The drawings are only examples and are not drawn to an exact scale.

[0023] It should also be understood that the terms "comprising", "having", "including", "containing", when used in this specification, indicate the presence of the stated features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than modifying an individual element in the list.

[0024] As described herein, the tail end of the gel pen refill refers to the end away from the writing nib of the gel pen refill.

[0025] Embodiment 1:

[0026] As Figure 1 and Figure 2 shown, the gel pen of the present invention includes a pen barrel 1, a nib 2 is provided at one end of the pen barrel 1. In this embodiment, the nib 2 is threadedly connected to the pen barrel 1. The nib 2 can be an integral structure with the pen barrel 1. A sheath 3 is provided on the side of the pen barrel 1 opposite to the nib 2. A plurality of sheath ribs 1-4 are provided on the pen barrel 1. Connection holes 3-1 matching the sheath ribs 1-4 are provided on the sheath 3. The sheath ribs 1-4 are inserted into the connection holes 3-1, so that the pen barrel 1 circumferentially limits the sheath 3.

[0027] Inside the pen barrel 1, there are two gel pen refills 10, two pen refill driving members 7, two springs 9, and two spring limit members 8. At one end of the pen barrel 1 away from the pen tip 2, there is a first pressing part 4 and a pen clip 6. On the pen clip 6, there is a second pressing part 5. The pen refill driving members 7, the springs 9, and the spring limit members 8 are arranged in pairs. On the inner side wall of the pen barrel 1, there is a boss structure limited by the spring limit member 8. On one side of the pen refill driving member 7 opposite to the spring limit member 8, there are limit bumps for the spring 9. The two ends of the spring 9 are respectively sleeved on the limit bumps of the pen refill driving member 7 and the spring limit member 8. The two spring limit members 8 can be joined together. After complete joining, the outer dimension of the cross-section of the outer circle is matched with the inner dimension of the cross-section of the pen barrel 1. On both sides of the spring limit member 8, there are semi-holes respectively. After the two spring limit members 8 are joined together, a splicing hole through which the gel pen refill 10 can pass is formed between the two spring limit members 8. The two spring limit members 8 can also be of an integral structure with the pen barrel 1.

[0028] As Figure 2 and Figure 3 shown in, one side of the pen refill driving member 7 is opposite to the spring limit member 8. The two pen refill driving members 7 can be joined together. After complete joining, the outer dimension of the cross-section of the side of the pen refill driving member 7 opposite to the spring limit member 8 is matched with the inner dimension of the cross-section of the pen barrel 1. And on both sides of the splicing position, there are semi-holes respectively. After the two pen refill driving members 7 are joined together, a splicing hole through which the gel pen refill 10 can pass is formed between the splicing positions of the pen refill driving members 7.

[0029] A clamping rod 7-1 and a refill connecting part 7-2 are provided on the other side of the refill transmission member 7. The connection between the clamping rod 7-1 and the refill transmission member 7 is elastic. A limiting block 7-11 is provided on the clamping rod 7-1. In a natural state, the distance between the limiting block 7-11 and the central axis of the pen shaft 1 is greater than the cross-sectional radius of the pen shaft 1. A clamping rod slide 1-2 is provided on the side wall of the pen shaft 1 at a position opposite to the clamping rod 7-1. The limiting block 7-11 is limited to slide in the clamping rod slide 1-2. A core-discharging limiting snap-in 1-22 and a core-collecting limiting snap-in 1-21 are provided on the side wall of the clamping rod slide 1-2. The core-discharging limiting snap-in 1-22 and the core-collecting limiting snap-in 1-21 are grooves both connected to the clamping rod slide 1-2. The core-discharging limiting snap-in 1-22 is closer to the pen tip 2 than the core-collecting limiting snap-in 1-21. The end face of the limiting block 7-11 is provided with a clamping surface for cooperating with the core-exiting limit snap-in 1-22 and the core-collecting limit snap-in 1-21, and the side face of the limiting block 7-11 is provided with an inclined surface for avoiding the core-exiting limit snap-in 1-22 and the core-collecting limit snap-in 1-21. When the limiting block 7-11 slides in the clamping rod slide groove 1-2, the limiting block 7-11 can enter the core-exiting limit snap-in 1-22 or the core-collecting limit snap-in 1-21 through the groove mouth connected with the clamping rod slide groove 1-2, and is limited by the clamping surface of the limiting block 7-11 contacting with one side face of the core-exiting limit snap-in 1-22 or the core-collecting limit snap-in 1-21. The limiting block 7-11 can also avoid the core-exiting limit snap-in 1-22 or the core-collecting limit snap-in 1-21 through the inclined surface of the side face and exit the core-collecting limit snap-in 1-22 or the core-collecting limit snap-in 1-21.

[0030] A plug-in protrusion is provided on one side of the refill connection part 7-2, and the plug-in protrusion is inserted into the tail end of the core tube of the gel pen refill 10 and has an interference fit, so that the refill transmission member 7 is connected to the gel pen refill 10. A plug-in groove can also be provided on the refill connection part 7-2, so that the tail end of the core tube of the gel pen refill 10 is inserted into the plug-in groove and has an interference fit, which can also connect the refill transmission member 7 to the gel pen refill 10. The other side of the refill connection part 7-2 is opposite to and cooperates with the first push part 4 or the second push part 5, and a limiting protrusion 7-21 is provided. Figure 2 and Figure 4 As shown in , the first push part 4 is provided with a first limiting surface 4-1, the second push part 5 is provided with a second limiting surface 5-1, the limiting protrusion 7-21 of one refill connection part 7-2 cooperates with the first limiting surface 4-1 to limit the first push part 4, and the limiting protrusion 7-21 of the other refill connection part 7-2 cooperates with the second limiting surface 5-1 to limit the second push part 5. The part where the first limiting surface 4-1 of the first push part 4 is located extends into the pen barrel 1 through the end of the pen barrel 1 and cooperates with the corresponding refill connection part 7-2, and the manual pressing part of the first push part 4 is exposed outside the pen barrel 1.

[0031] like Figure 2 andFigure 5 As shown in the figure, at one end of the pen barrel 1 away from the pen tip 2, there are two oppositely arranged clip connection grooves 1-1. On the pen clip 6, there are two clamping blocks 6-1 that cooperate with the clip connection grooves 1-1. The clamping blocks 6-1 are clamped in the corresponding clip connection grooves 1-1 to limit the pen clip 6 by the pen barrel 1. On the pen clip 6, there is a second pressing part sliding groove II 6-2. The second pressing part 5 is arranged in the second pressing part sliding groove II 6-2 and can slide along the second pressing part sliding groove II 6-2. On the pen barrel 1, there is a second pressing part sliding groove I 1-3 opposite to it. One end of the second pressing part sliding groove I 1-3 is open. The part where the second limiting surface 5-1 on the second pressing part 5 is located slides into the second pressing part sliding groove I 1-3 through the opening of the second pressing part sliding groove I 1-3 and cooperates with the corresponding pen core connecting part 7-2. The manual pressing part of the second pressing part 5 is then limited outside the second pressing part sliding groove II 6-2.

[0032] In the gel pen of the present invention, a driving part limiting structure for limiting the corresponding pen core driving part 7 is composed of a clamping rod sliding groove 1-2, a core extending limiting bayonet 1-22, a core retracting limiting bayonet 1-21, and a limiting block 7-11. The first pressing part 4 and the second pressing part 5 are respectively the manual parts of the corresponding pen core driving part 7. A driving assembly for the corresponding gel pen refill 10 is composed of the corresponding manual parts, the pen core driving part 7, and the driving part limiting structure. In the initial state, the limiting blocks 7-11 are all clamped in the core retracting limiting bayonets 1-21. Taking the driving assembly where the first pressing part 4 is located as an example, when pressing the first pressing part 4, it can drive the corresponding pen core driving part 7 to slide along the pen barrel 1, thereby driving the corresponding gel pen refill 10 to extend from the pen tip 2. At this time, the corresponding limiting block 7-11 exits the core retracting limiting bayonet 1-21 and slides along the clamping rod sliding groove 1-2, and the corresponding elastic part, that is, the spring 9, is compressed. When the limiting block 7-11, as the first structure, enters the core extending limiting bayonet 1-22, as the second structure, the limiting block 7-11 is limited, that is, the corresponding pen core driving part 7 is limited, and the corresponding gel pen refill 10 maintains the state of extending from the pen tip 2 and can be used for stable writing. Pressing the first pressing part 4 again, the limiting block 7-11 exits the core extending limiting bayonet 1-22. After releasing the first pressing part 4, the corresponding spring 9 rebounds, pushing the pen core driving part 7 to retract along the pen barrel 1, driving the corresponding gel pen refill 10 to retract into the pen tip 2. At this time, the corresponding limiting block 7-11 also slides along the clamping rod sliding groove 1-2. When the limiting block 7-11, as the first structure, enters the core retracting limiting bayonet 1-21, as the third structure, the limiting block 7-11 is limited, that is, the corresponding pen core driving part 7 is limited, and the corresponding gel pen refill 10 maintains the state of being retracted in the pen tip 2. The pen core driving part 7 also pushes the first pressing part 4 to reset at the same time. At this time, the second pressing part 5 can be pressed to make another gel pen refill 10 extend the core.

[0033] Embodiment 2:

[0034] The difference between the gel pen of this embodiment and that of Embodiment 1 lies in that no spring 9 and spring limit member 8 are provided inside the pen barrel 1, and no snap rod chute 1-2 is provided on the pen barrel 1. The first pressing part 4 and the second pressing part 5 are respectively rigidly connected to the corresponding refill driving members 7, and both can transmit axial force and torque to the corresponding refill driving members 7. The core-out limiting bayonet 1-22 and the core-in limiting bayonet 1-21 are both grooves provided on the inner side wall of the pen barrel 1 and one side of each has an opening. The said opening is used for the limiting block 7-11 to enter or exit. As long as the corresponding first pressing part 4 or second pressing part 5 is rotated, the limiting block 7-11 can exit or enter the corresponding core-out limiting bayonet 1-22 or core-in limiting bayonet 1-21 from the said opening. As long as the first pressing part 4 or the second pressing part 5 is pushed, the corresponding refill driving member 7 can push the gel pen refill 10 to extend from the pen tip 2. As long as the first pressing part 4 or the second pressing part 5 is pulled, the corresponding refill driving member 7 can drive the gel pen refill 10 to retract into the pen tip 2. The first pressing part 4 and the second pressing part 5 can also be of an integral structure with the corresponding refill driving members 7 respectively.

[0035] The above are only specific embodiments of the present invention and are not used to limit the scope of implementation of the present invention; if the present invention is modified or equivalently replaced without departing from the spirit and scope of the present invention, it shall be covered by the protection scope of the claims of the present invention.

Claims

1. A gel pen, characterized in that, it includes a pen barrel (1), at least two gel pen refills (10) are arranged in the pen barrel (1), and a set of driving components are arranged in the pen barrel (1) for each gel pen refill (10). Each set of driving components includes a pen refill transmission member (7), a transmission member limiting structure, and an elastic member and an elastic member limiting structure arranged in the pen barrel (1); a clamping rod (7-1) and a pen refill connection part (7-2) are arranged on the pen refill transmission member (7). The clamping rod (7-1) and the pen refill connection part (7-2) are arranged on the same side of the pen refill transmission member (7). The elastic member limiting structure is located on the other side of the pen refill transmission member (7). A manual part extending outside the pen barrel (1) is also arranged on the pen refill transmission member (7); one side of the pen refill connection part (7-2) is connected to the tail end of the gel pen refill (10), and the other side is in contact connection with the manual part. The manual part is used to drive the pen refill transmission member (7) to slide along the pen barrel (1), and the pen refill transmission member (7) is used to drive the gel pen refill (10) to extend or retract from the tip of the pen barrel (1); the transmission member limiting structure includes a first structure, a second structure and a third structure; a limiting block (7-11) serving as the first structure is arranged on the clamping rod (7-1). The connection between the clamping rod (7-1) and the pen refill transmission member (7) has elasticity. In the natural state, the distance between the limiting block (7-11) and the central axis of the pen barrel (1) is greater than the cross-sectional radius of the pen barrel (1); two grooves serving as the second structure and the third structure are arranged on the inner side wall of the pen barrel (1). One side of both the second structure and the third structure is provided with an opening, and the opening is used for the limiting block (7-11) to enter or exit the corresponding groove; the second structure is located between the tip of the pen barrel (1) and the third structure. After the gel pen refill (10) extends from the tip of the pen barrel (1), the second structure is used to cooperate with the first structure to limit the pen refill transmission member (7). After the gel pen refill (10) retracts from the tip of the pen barrel (1), the third structure is used to cooperate with the first structure to limit the pen refill transmission member (7); the elastic member limiting structures can be mutually assembled between two by two. The outer dimension of the cross-section of all the elastic member limiting structures after complete assembly matches the inner dimension of the cross-section of the pen barrel (1). A splicing hole for the gel pen refill (10) to pass through is arranged between every two of the elastic member limiting structures; the elastic member is arranged between the elastic member limiting structure and the pen refill transmission member (7) and can expand and contract along the length direction of the pen barrel (1). When the pen refill transmission member (7) pushes the gel pen refill (10) to extend from the tip of the pen barrel (1), the elastic member is compressed, and the elastic member rebounds to push the pen refill transmission member (7) to drive the gel pen refill (10) to retract from the tip of the pen barrel (1).

2. The gel pen according to claim 1, characterized in that, The limiting structure of the transmission part further includes a clamping rod chute (1-2) provided on the side wall of the pen barrel (1). The second structure and the third structure are respectively grooves communicating with the clamping rod chute (1-2), namely the lead-out core limiting bayonet (1-22) and the core-retracting limiting bayonet (1-21). The limiting block (7-11) is limited to slide within the clamping rod chute (1-2) and can be respectively limited by the lead-out core limiting bayonet (1-22) and the core-retracting limiting bayonet (1-21).

3. The gel pen according to claim 2, wherein, a clamping surface for cooperating with the lead-out core limiting bayonet (1-22) and the core-retracting limiting bayonet (1-21) is provided on the end face of the limiting block (7-11), and an inclined surface for avoiding the lead-out core limiting bayonet (1-22) and the core-retracting limiting bayonet (1-21) is provided on the side surface of the limiting block (7-11).

4. The gel pen according to claim 1, wherein, the elastic part limiting structure is a structure integrated with the pen barrel (1) or an independent structure limited by the inner side wall of the pen barrel (1).

5. The gel pen according to claim 4, wherein, the structures on the side of the pen core transmission part (7) opposite to the elastic part can be mutually joined. The outer dimension of the cross-section of all the structures on the side of the pen core transmission part (7) opposite to the elastic part after complete joining matches the inner dimension of the cross-section of the pen barrel (1). Joining holes for the gel pen refill (10) to pass through are provided between the structures on the side of the pen core transmission part (7) opposite to the elastic part in pairs.

6. The gel pen according to claim 4, wherein, a limiting convex block (7-21) is provided on the side of the pen core connection part (7-2) in contact connection with the manual part, a limiting surface is provided at the part of the manual part in contact with the pen core connection part (7-2), and the limiting convex block (7-21) cooperates with the limiting surface of the manual part to limit the manual part.

7. The gel pen according to claim 1, wherein, a plugging convex block or a plugging groove for connecting with the tail end of the gel pen refill (10) is provided on the pen core connection part (7-2). When a plugging convex block is provided, the plugging convex block is inserted into the tail end of the core tube of the gel pen refill (10) and has an interference fit; when a plugging groove is provided, the tail end of the core tube of the gel pen refill (10) is inserted into the plugging groove and has an interference fit.

8. The gel pen according to claim 1, wherein, a pen clip (6) is further provided on the pen barrel (1), the pen barrel (1) limits the pen clip (6), the manual part corresponding to one of the pen core transmission parts (7) is provided on the pen clip (6) and can slide along the pen clip (6), a chute cooperating with the manual part on the pen clip (6) is provided on the pen barrel (1), and the manual part provided on the pen clip (6) extends into the chute and is connected to the corresponding pen core transmission part (7).

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