Push-pull writing stationery

Abstract

The push-pull type writing stationery comprises a pen holder and a pen refill, the pen refill is arranged in the pen holder, and a pen point of the pen refill extends out of the pen holder; the push-pull type writing stationery further comprises a sealing assembly, the sealing assembly comprises a first sleeve, a second sleeve and a sealing piece, an opening is formed in one end of the first sleeve, a sliding groove is formed in the pipe wall of the other end of the first sleeve, a sliding block is arranged on the inner wall of the second sleeve, and the sliding block is arranged in the sliding groove in a sliding mode. A turnable sealing part is arranged on the sealing element, the sealing element is sleeved with the first sleeve, and the sealing part is configured to be an opening and closing opening; wherein the sealing piece is arranged outside the pen holder, the first sleeve sleeves the pen holder and is close to the pen point, and the second sleeve sleeves the pen holder and is far away from the pen point; the first sleeve is slidably arranged on the penholder and configured to slide along the penholder and drive the sealing component to turn over so as to open and close the opening. Misoperation is reduced, so that the use experience and safety of a user are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of writing tools, in particular to a push-pull type writing instrument. BACKGROUND

[0002] At present, writing pens are essential stationery in people's daily life and work. The nibs of individual types of writing pens need to be sealed when not in use. The sealing methods generally include push-pull type writing instruments and cap type writing pens. Push-pull type writing instruments are widely used due to their convenient operation. For example, Chinese Patent Publication Nos. CN116215117A and CN116215117A each disclose a push-pull type writing instrument. Both of them use a pressing method to drive the ink cartridge to slide in the pen barrel, so that the shielding part in the sealing assembly is flipped. In this way, the ink cartridge can be sealed in the pen barrel by the shielding part, or the shielding part is flipped to open and the nib of the ink cartridge is extended to the outside of the pen barrel. However, in actual use, the pressing part at the end of the pen barrel is easily mispressed by external force, causing the nib of the ink cartridge to extend. On the one hand, this can cause the nib to lose moisture and be unable to write. On the other hand, it can cause the user's clothes or paper to be contaminated. In view of this, how to design a technology that reduces misoperation to improve user experience and safety is a technical problem to be solved by the present application. SUMMARY

[0003] The present application provides a push-pull type writing instrument that reduces misoperation to improve user experience and safety.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: The present application provides a push-pull type writing instrument, which includes a pen barrel and an ink cartridge. The ink cartridge is arranged in the pen barrel, and the nib of the ink cartridge extends to the outside of the pen barrel. The push-pull type writing instrument further includes a sealing assembly and a spring. The sealing assembly includes a first sleeve, a second sleeve, and a sealing member. One end of the first sleeve is formed with an opening, and the pipe wall of the other end of the first sleeve is provided with a sliding groove. The inner wall of the second sleeve is provided with a sliding block, which is slidably arranged in the sliding groove. The sealing member is provided with a reversible sealing part. The first sleeve is sleeved outside the sealing member, and the sealing part is configured to open and close the opening. The spring is arranged between the first sleeve and the pen barrel, and is configured to apply a spring force to the first sleeve in the direction of the nib of the ink cartridge. The sealing element is disposed outside the pen barrel, the first sleeve is sleeved outside the pen barrel and close to the pen tip, and the second sleeve is sleeved outside the pen barrel and away from the pen tip; the first sleeve is slidably disposed on the pen barrel and configured to slide along the pen barrel and drive the sealing element to flip to open or close the opening.

[0005] Furthermore, the slide groove is provided with a snap-fit ​​part, which is arranged at the end of the slide groove near the pen tip; The snap-fit ​​portion is configured to engage with the slider to position the first sleeve on the pen barrel when the sealing component is flipped open to open the opening.

[0006] Furthermore, the end of the first sleeve away from the pen tip has an outwardly extending insertion portion, the insertion portion having the sliding groove, and the insertion portion being inserted into the second sleeve.

[0007] Furthermore, the second sleeve has an outwardly extending guide portion at the end facing the pen tip; The outer wall of the first sleeve is provided with a guide slot, and the guide part is inserted into the guide slot.

[0008] Furthermore, the port edge of the plug-in portion is provided with a mounting guide groove; Along the length of the slide, the mounting guide groove is arranged on the outside of the slide.

[0009] Furthermore, with the sealing component flipped to close the opening, the pen barrel and the pen refill are enclosed within the sealing assembly.

[0010] Furthermore, with the sealing component flipped open to open the opening, the tip of the pen refill is located outside the opening, and the first sleeve is away from the tip of the pen refill. With the sealing component flipped to close the opening, the tip of the pen refill is located inside the opening and inside the first sleeve.

[0011] Furthermore, the sealing member includes a first connecting member, a second connecting member, and a flexible connecting member. The sealing member is disposed between the first connecting member and the second connecting member via the flexible connecting member, and the sealing member is flip-over relative to the first connecting member and the second connecting member. The first sleeve is provided with a pulling part, which is configured to pull the first connecting member to slide together as the first sleeve slides toward the pen tip away from the pen refill, so that the sealing member is exposed from the opening and flipped open the opening.

[0012] Furthermore, the inner wall of the first sleeve is provided with a pushing part, and the pulling part is located between the pushing part and the opening; the pushing part is configured to push the first connecting member to slide together as the first sleeve slides toward the pen tip near the pen refill, so that the sealing member flips and retracts into the opening to close the opening.

[0013] Furthermore, a sealing ring is also provided in the first sleeve, the sealing ring being sleeved on the outside of the pen barrel and located between the pushing part and the sealing element.

[0014] Furthermore, the spring is located within the first sleeve.

[0015] Furthermore, the pen barrel includes a first rod and a second rod, which are detachably connected together; The pen refill is inserted into the first rod, and the pen tip of the pen refill extends to the outside of the first rod. The second rod is fitted over the outside of the pen refill.

[0016] The technical solution of this invention has the following advantages over the prior art: By setting a sealing component on the outside of the pen barrel, the first sleeve is sleeved on the outside of the pen barrel and can slide on the outside of the pen barrel. The sliding first sleeve can drive the sealing component on the sealing element to flip, thereby opening the opening of the first sleeve to allow the pen tip to extend out of the opening for writing, or closing the opening to protect the pen tip; during use, when it is necessary to open the opening for use, the user pulls the first sleeve. Under the guiding action of the sliding groove and the slider, the first sleeve slides on the pen barrel. The first sleeve drives the sealing component to flip and open the opening to expose the pen tip of the pen refill. In this way, it can avoid accidental operation caused by pressing, which would expose the pen tip, thereby reducing accidental operation and improving the user experience and safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the push-pull writing instrument of the present invention in the closed state; Figure 2 for Figure 1 A schematic diagram of an embodiment of a push-pull writing instrument in the open state; Figure 3 for Figure 1 A cross-sectional view of a push-pull writing instrument; Figure 4 for Figure 3 A magnified view of a portion of region A in the middle; Figure 5 for Figure 2 A cross-sectional view of a push-pull writing instrument; Figure 6 for Figure 5 A magnified view of a portion of region B in the middle; Figure 7 for Figure 2 One of the exploded views of a push-pull writing instrument; Figure 8 for Figure 2 Exploded view of a push-pull writing instrument (part two); Figure 9 for Figure 1 Schematic diagram of the structure of the first casing; Figure 10 for Figure 1 Schematic diagram of the structure of the second sleeve; Figure 11 for Figure 1 One of the structural schematic diagrams of the central sealing component; Figure 12 for Figure 1 The second schematic diagram of the structure of the central sealing component.

[0018] Figure label: 1. Pen barrel; 2. Pen refill; 21. Pen tip; 3. Sealing assembly; 31. First sleeve; 32. Seal; 33. Sealing ring; 34. Second sleeve; 311. Opening; 312. Pulling part; 313. Pushing part; 314. Limiting part; 315. Slide groove; 316. Snap-fitting part; 317. Insertion part; 318. Guide slot; 319. Mounting guide groove; 341. Slider; 342. Guide part; 321. Sealing component; 322. First connecting component; 323. Second connecting component; 324. Flexible connecting component; 3221. Pulling mating part; 3222. Pushing mating part; 3223. First elastic claw; 3231. Second elastic claw; 4. Spring. Detailed Implementation

[0019] like Figures 1-12 As shown, the present invention provides a push-pull writing instrument, including a pen barrel 1 and a pen refill 2, wherein the pen refill 2 is disposed in the pen barrel 1, and the pen tip 21 of the pen refill 2 extends to the outside of the pen barrel 1; The push-pull writing stationery also includes a sealing component 3, which includes a first sleeve 31, a second sleeve 34, and a sealing element 32. One end of the first sleeve 31 has an opening 311, and the other end of the first sleeve 31 has a groove 315 on its wall. The inner wall of the second sleeve has a slider 341, which is slidably disposed in the groove 315. The sealing element 32 is provided with a reversible sealing component 321, the sealing element 32 is located in the first sleeve 31, and the sealing component is configured to open or close the opening 311. The sealing element 32 is disposed outside the pen barrel 1. The first sleeve 31 is sleeved outside the pen barrel 1 and close to the pen tip 21. The second sleeve 34 is sleeved outside the pen barrel 1 and away from the pen tip 21. The first sleeve 31 is slidably disposed on the pen barrel 1 and is configured to slide along the pen barrel 1 and drive the sealing element 321 to flip to open or close the opening 311.

[0020] Specifically, during the actual assembly process, after the pen refill 2 is inserted into the pen barrel 1, the pen tip 21 of the pen refill 2 is exposed outside the pen barrel 1; then, the sealing member 32 is installed on the outside of the pen barrel 1 and the first sleeve 31 is put on the outer sleeve of the sealing member 32, and the first sleeve 31 will be simultaneously put on the outside of the pen barrel 1; the second sleeve 34 is also put on the pen barrel 1, and the first sleeve 31 and the second sleeve 34 are connected so that the slider 341 is inserted into the slide groove 315, realizing the sliding assembly of the slider 341 and the slide groove 315.

[0021] During the reciprocating sliding of the first sleeve 31 along the rod 1, the slider 341 cooperates with the groove 315 to guide the first sleeve 31 to slide smoothly back and forth, thereby improving the smoothness of use.

[0022] During use, the first sleeve 31 is pushed and pulled to move it back and forth along the pen barrel 1. When it is necessary to open the opening 311 to expose the pen tip 21 for writing, the first sleeve 31 can be pushed toward the second sleeve 34. As the first sleeve 31 slides on the pen barrel 1, it will cause the sealing component 321 on the sealing component 32 to flip to the outside of the opening 311 to open the opening 311. At the same time, the pen tip 21 will extend to the outside of the opening 311 of the first sleeve 31.

[0023] Conversely, when it is necessary to close the opening 311 so that the pen tip 21 retracts into the first sleeve 31 for protection, the first sleeve 31 is pulled in the opposite direction away from the second sleeve 34. As the first sleeve 31 slides on the pen barrel 1, it will cause the sealing component 321 on the sealing component 32 to flip into the opening 311 to close the opening 311. At the same time, the pen tip 21 will retract into the first sleeve 31.

[0024] By setting a sealing component 3 on the outside of the pen barrel 1, the first sleeve 31 is sleeved on the outside of the pen barrel 1 and can slide on the outside of the pen barrel 1. The sliding first sleeve 31 can drive the sealing component 321 on the sealing component 32 to flip, thereby opening the opening 311 of the first sleeve 31 to allow the pen tip 21 to extend out of the opening 311 for writing, or closing the opening 311 to protect the pen tip 21. During use, when it is necessary to open the opening 311, the user pulls the first sleeve 31 to make the first sleeve 31 slide on the pen barrel 1, thereby driving the sealing component 321 to flip and open the opening 311 to expose the pen tip 21 of the pen refill 2. In this way, the pen tip 21 can be avoided from being exposed due to accidental operation caused by pressing, thereby reducing accidental operation and improving the user experience and safety.

[0025] When the sealing component 321 is flipped to close the opening 311, the pen tip 21 of the pen refill 2 is located inside the opening 311, and the pen tip 21 of the pen refill 2 is located inside the first sleeve 31.

[0026] Specifically, when not in use, the sealing component 321 of the sealing component 32 blocks the opening 311 of the first sleeve 31, thereby forming a relatively closed space between the first sleeve 31, the sealing component 321 and the second sleeve 34, and the pen tip 21 and the pen barrel of the pen refill 2 are located in this relatively closed space for protection.

[0027] That is, when the sealing component 321 is flipped to close the opening 311, the pen barrel 1 and the pen refill 2 are enclosed in the sealing assembly.

[0028] Furthermore, when the sealing component 321 is flipped open to open the opening 311, the pen tip 21 of the pen refill 2 is located outside the opening 311, and the first sleeve 31 is away from the pen tip 21 of the pen refill 2.

[0029] Specifically, when the user needs to use it, the pen is opened by pulling the first sleeve 31 outside the pen barrel 1. The specific process is as follows: the first sleeve 31 slides outside the pen barrel 1 in a direction away from the pen tip 21. During the sliding process, the sealing component 321 will be exposed from the opening 311. On the other hand, the exposed sealing component 321 will flip open the opening 311 and finally allow the pen tip of the pen refill 2 to extend out of the opening 311.

[0030] In some embodiments, the slide groove is provided with a snap-fit ​​portion 316, which is arranged at the end of the slide groove 315 near the pen tip 21; The snap-fit ​​portion 316 is configured to engage with the slider 341 to position the first sleeve 31 on the pen barrel 1 when the sealing member 321 is flipped open to open the opening 311.

[0031] Specifically, since the first sleeve 31 uses a push-pull mechanism to drive the sealing component 321 to open and close the opening 311, it is necessary to ensure that the first sleeve 31 remains in the same state when the user is writing. For this purpose, a locking part 316 is provided in the slide groove 315. After the first sleeve 31 is pushed to expose the pen tip 21, the slider 341 slides relative to the pen tip 211 in the slide groove 315 to approach the locking part 316 and finally engage with the locking part 316 to limit the position of the first sleeve 31 on the pen barrel 1.

[0032] The physical form of the snap-fit ​​part 316 can have various structures. For example, the snap-fit ​​part 316 can be a protrusion structure provided in the slide groove 315 to meet the requirement of snapping the slider 341 to position the first sleeve 31.

[0033] In another embodiment, the end of the first sleeve away from the pen tip is provided with an outwardly extending insertion portion 317, the insertion portion 317 being provided with the sliding groove 315, and the insertion portion 317 being inserted into the second sleeve 34.

[0034] Specifically, in order to improve the connection reliability between the first sleeve 31 and the second sleeve 34 and ensure the smooth sliding of the first sleeve 31, a plug-in part 317 is provided at the corresponding end of the first sleeve 31 to be inserted into the second sleeve 34. This ensures that the sliding stability is improved by the plug-in part 317 always being inserted into the second sleeve 34 during the sliding of the first sleeve 31 on the pen barrel 1.

[0035] In some embodiments, the end of the second sleeve 34 facing the pen tip 21 is provided with an outwardly extending guide portion 342; The outer wall of the first sleeve 31 is provided with a guide slot 318, and the guide part 342 is inserted into the guide slot 318.

[0036] Specifically, during the sliding process of the first sleeve 31, in addition to the guide provided by the cooperation between the slider 341 and the groove 315, the sliding of the first sleeve 31 can be further guided by the cooperation between the guide part 342 and the guide slot 318.

[0037] In another embodiment, in order to facilitate the insertion of the slider 341 into the slide groove 315, the port edge of the insertion part is provided with an installation guide groove 319; Along the length of the slide groove 315, the mounting guide groove 319 is arranged on the outside of the slide groove 315.

[0038] Specifically, during the assembly process, after the first sleeve 31 and the second sleeve 34 are both fitted onto the outside of the pen barrel 1, the insertion part 317 of the first sleeve 31 is inserted into the second sleeve 34, and the slider 341 is easily installed into the slide groove 315 via the mounting guide groove 319 to achieve the purpose of convenient assembly.

[0039] Furthermore, the first sleeve 31 has an open structure at both ends. The second sleeve 34 has an open structure at one end and a closed structure at the other end to cooperate with the end of the pen barrel 1 away from the pen tip 21 to prevent the pen barrel 1 from detaching from the second sleeve 34. For example, the end of the second sleeve 34 that needs to be closed is provided with a plug 340, which can be snapped onto the second sleeve 34.

[0040] In another embodiment of this application, in order to enable the sealing member 321 to flip under the drive of the first sleeve 31 to open and close the opening 311, the specific structure of the sealing member 32 is improved as follows.

[0041] The sealing member 32 includes a first connecting member 322, a second connecting member 323 and a flexible connecting member 324. The sealing member 321 is disposed between the first connecting member 322 and the second connecting member 323 through the flexible connecting member 324. The sealing member 321 can be flipped relative to the first connecting member 322 and the second connecting member 323. The first sleeve 31 is provided with a pulling part 312, which is configured to pull the first connecting member 322 to slide together as the first sleeve 31 slides toward the pen tip 21 away from the pen refill 2, so that the sealing member 321 is exposed from the opening 311 and flipped open the opening 311.

[0042] Specifically, in order to drive the sealing member 321 to flip and open the opening 311 by sliding the first sleeve 31 away from the pen tip 21, a pulling part 312 is provided on the inner wall of the first sleeve 31. During the movement of the first sleeve 31, the pulling part 312 will apply a pulling force to the first connecting member 322, so that the first connecting member 322 can move with the first sleeve 31 on the pen barrel 1. During the movement of the first connecting member 322 relative to the pen barrel 1, the first connecting member 322 will move relative to the second connecting member 323. The flexible connecting member 324 is used to make the sealing member 321 flip between the first connecting member 322 and the second connecting member 323 to open the opening 311.

[0043] The first connecting component 322 has a raised pull engagement part 3221 on its outer surface. The pull part 312 will abut against the pull engagement part 3221, thereby causing the first connecting component 322 to slide along the first sleeve 31 on the pen barrel 1.

[0044] In another embodiment, the inner wall of the first sleeve 31 is provided with a pushing part 313, and the pulling part 312 is located between the pushing part 313 and the opening 311; the pushing part 313 is configured to push the first connecting member 322 to slide together as the first sleeve 31 slides toward the pen tip 21 near the pen refill 2, so that the sealing member 321 flips and retracts into the opening 311 to close the opening 311.

[0045] Specifically, after use, the user pushes the first sleeve 31 in the reverse direction so that the first sleeve 31 moves toward the pen tip 21. During the movement, the first sleeve 31 pushes the first connecting component to move in the reverse direction through the pushing part 313, thereby realizing the sliding of the first connecting component toward the pen tip 21. During the sliding process, the sealing component 321 flips and resets, and finally seals the opening 311 of the first sleeve 31.

[0046] Similarly, a push-fit part 3222 can be provided on the first connecting member, and the push part 313 abuts against the push-fit part 3222 so that the first connecting member is pushed back to its original position.

[0047] In some embodiments, in order to allow the first connecting component and the second connecting member to slide intermittently during the reciprocating sliding of the first sleeve 31, a first elastic claw 3223 can be provided on the first connecting component, a second elastic claw 3231 can be provided on the second connecting member, and a limiting part 314 can also be provided in the first sleeve 31.

[0048] Specifically, when the sealing component 321 is in the closed opening 311 state, the first elastic claw 3223 and the second elastic claw 3231 are staggered along the length direction of the pen barrel 1, wherein the first elastic claw 3223 is close to the opening 311, and the second elastic claw 3231 is away from the opening 311.

[0049] Thus, during the opening process, the first sleeve 31 moves so that the misaligned first elastic claw 3223 and second elastic claw 3231 successively pass over the limiting part 314 and move to one side of the limiting part 314. During this process, the pulling part 312 gradually approaches the pulling mating part 3221, the sealing member 32 remains basically stationary, and the sealing member 321 will be exposed from the opening 311.

[0050] As the first sleeve 31 continues to move, the pulling part 312 abuts against the pulling mating part 3221. At this time, the first connecting part will move with the first sleeve 31, while the second connecting part will remain stationary because the second elastic claw 3231 is locked on the limiting part 314. In this way, the sealing part 321 can be flipped open.

[0051] In one embodiment, in order to improve the sealing performance, a sealing ring 33 is also provided in the first sleeve 31. The sealing ring 33 is sleeved on the outside of the pen barrel 1 and located between the push part 313 and the sealing member 32.

[0052] Specifically, the opening 311 of the first sleeve 31 is sealed and covered by the sealing component 321, while the first sleeve 31 and the pen barrel 1 are airtightly sealed by the sealing ring 33.

[0053] In one embodiment, to maintain an effective closed state when the sealing member 321 closes the opening 311 without force, the push-pull writing instrument also includes a spring 4 disposed between the first sleeve 31 and the pen barrel 1, the spring 4 being configured to apply a spring force 4 to the first sleeve 31 toward the pen tip 21 of the pen refill 2.

[0054] Specifically, when the opening 311 is closed by the sealing component 321, the spring 4 will continuously apply a spring force to the first sleeve 31 to ensure that the first sleeve 31 does not slide arbitrarily on the pen barrel 1. When the user needs to open and use the pen, he / she pulls the first sleeve 31 to overcome the spring force of the spring 4. The spring 4 is located inside the first sleeve 31.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A push-pull writing instrument, comprising a pen barrel and a refill, wherein the refill is disposed in the pen barrel, characterized in that, The tip of the pen refill extends outside the pen barrel; The push-pull writing instrument also includes a sealing component and a spring; The sealing assembly includes a first sleeve, a second sleeve, and a sealing element. One end of the first sleeve has an opening, and the other end of the first sleeve has a groove on its wall. The inner wall of the second sleeve has a slider, which is slidably disposed in the groove. The sealing element has a reversible sealing component. The first sleeve is fitted over the outside of the sealing element, and the sealing component is configured to open and close the opening. The spring is disposed between the first sleeve and the pen barrel, and the spring is configured to apply a spring force to the first sleeve toward the pen tip of the pen refill; The sealing element is disposed outside the pen barrel, the first sleeve is sleeved outside the pen barrel and close to the pen tip, and the second sleeve is sleeved outside the pen barrel and away from the pen tip; the first sleeve is slidably disposed on the pen barrel and configured to slide along the pen barrel and drive the sealing element to flip to open or close the opening.

2. The push-pull writing instrument according to claim 1, characterized in that, The slide groove is provided with a locking part, which is arranged at the end of the slide groove near the pen tip; The snap-fit ​​portion is configured to engage with the slider to position the first sleeve on the pen barrel when the sealing component is flipped open to open the opening.

3. The push-pull writing instrument according to claim 1, characterized in that, The end of the first sleeve away from the pen tip has an outwardly extending insertion portion, the insertion portion having the sliding groove, and the insertion portion being inserted into the second sleeve.

4. The push-pull writing instrument according to claim 3, characterized in that, The end of the second sleeve facing the pen tip is provided with an outwardly extending guide portion; The outer wall of the first sleeve is provided with a guide slot, and the guide part is inserted into the guide slot.

5. The push-pull writing instrument according to claim 3, characterized in that, The port edge of the plug-in part is provided with an installation guide groove; Along the length of the slide, the mounting guide groove is arranged on the outside of the slide.

6. The push-pull writing instrument according to claim 1, characterized in that, With the sealing component flipped to close the opening, the pen barrel and the pen refill are enclosed within the sealing assembly.

7. The push-pull writing instrument according to claim 1, characterized in that, With the sealing component flipped open to open the opening, the tip of the pen refill is located outside the opening, and the first sleeve is away from the tip of the pen refill.

8. The push-pull writing instrument according to claim 1, characterized in that, With the sealing component flipped to close the opening, the tip of the pen refill is located inside the opening and inside the first sleeve.

9. The push-pull writing instrument according to claim 1, characterized in that, The sealing element includes a first connecting component, a second connecting component, and a flexible connecting component. The sealing element is disposed between the first connecting component and the second connecting component via the flexible connecting component. The sealing element is flip-able relative to the first connecting component and the second connecting component. The first sleeve is provided with a pulling part, which is configured to pull the first connecting member to slide together as the first sleeve slides toward the pen tip away from the pen refill, so that the sealing member is exposed from the opening and flipped open the opening. The inner wall of the first sleeve is provided with a pushing part, and the pulling part is located between the pushing part and the opening; the pushing part is configured to push the first connecting member to slide together as the first sleeve slides toward the pen tip close to the pen refill, so that the sealing member flips and retracts into the opening to close the opening.

10. The push-pull writing instrument according to claim 9, characterized in that, The first sleeve is also provided with a sealing ring, which is sleeved on the outside of the pen barrel and located between the push part and the sealing element.

Images