Press-type writing instruments

Abstract

This invention provides a press-type writing instrument comprising a pen shaft, a pen nib, a spring, and a sealing assembly. The sealing assembly includes a first protective plate, a second protective plate, a shielding plate, and a connecting member, the first and second protective plates being positioned opposite each other to form a mounting passage. The shielding plate is positioned at the ends of the first and second protective plates, with a first flexible connection portion formed between it and the first protective plate. The connecting member is positioned between the first and second protective plates, with a second flexible connection portion formed between one end of the connecting member and the second protective plate, and a third flexible connection portion formed between the other end of the connecting member and the shielding plate. The sealing assembly is positioned inside the pen shaft, the pen nib is positioned inside the mounting passage, and the shielding plate is positioned where there is an access hole. When the pen nib extends beyond the pen shaft, the shielding plate rotates and opens on the outside of the pen shaft by relatively moving the first and second protective plates. Reducing the radial size of the writing pen and improving the grip enhances the user experience.

Description

Technical Field

[0004] ,

[0001] The present invention relates to stationery, and particularly to a pressing-type writing instrument.

Background Art

[0002] Currently, writing pens (such as signature pens, oil-based pens, gel pens, etc.) are indispensable stationery in people's daily lives and work. Also, writing pens are classified into pressing-type writing instruments and cap-type writing pens depending on the usage method, and the pressing-type writing instrument is widely used because its operation is convenient. In a pressing-type writing instrument using ink, it is particularly important to prevent the tip from drying out. Chinese Patent Publication Nos. CN108621640A, CN114103527A, and CN111186230A each describe technical solutions related to preventing the tip from drying out. In the above technical solutions, after the tip is housed inside the pen shaft, the tip is covered by a sealing part, and thus the effect of preventing drying can be almost achieved. However, due to the structural limitation that the sealing part is attached inside the pen shaft and opens and closes, the radial size of the pen shaft is large in order to ensure the movement space when the sealing part opens and closes, and the whole writing pen becomes thick, resulting in a problem that the grip comfort deteriorates. Therefore, how to design a writing instrument that reduces the radial size of the writing pen, improves the grip comfort, and enhances the user experience is the technical problem to be solved by the present invention.

Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a pressing-type writing instrument that reduces the radial size of the writing pen, improves the grip comfort, and enhances the user experience.

[0004] The technical solution provided by the present invention is a pressing-type writing instrument. The pressing-type writing instrument includes a pen shaft provided with an access hole at the tip and a pressing member disposed at the end, A pen tip is attached to the tip of the pen shaft, which is close to the entry / exit hole, and the pen core is slidably arranged within the pen shaft, and the pen core slides within the pen shaft when driven by the pressing member, A spring is disposed within the pen shaft and applies an elastic force to the pen core in a direction away from the insertion / removal hole, A sealed assembly comprising a first protective plate, a second protective plate, a shielding plate, and a connecting member, wherein the first protective plate and the second protective plate have arc-shaped cross-sections and are arranged opposite each other to form a mounting passage; the shielding plate is positioned at the ends of the first protective plate and the second protective plate, with a first flexible connecting portion formed between it and the first protective plate; the connecting member is positioned between the first protective plate and the second protective plate, with a second flexible connecting portion formed between one end of the connecting member and the second protective plate; and a third flexible connecting portion is formed between the other end of the connecting member and the shielding plate.

[0005] Here, the sealing assembly is located inside the pen shaft, the pen nib is located inside the mounting passage, and the shielding plate is located at the entry / exit hole. When the pen nib protrudes from the pen shaft, the first protective plate and the second protective plate move relative to each other, causing the shielding plate to rotate and open on the outside of the pen shaft.

[0006] By placing a sealed assembly in the pen barrel, and employing first and second protective plates positioned opposite the sealed assembly to form an installation passage for attaching the pen nib, and by using a shielding plate to seal the entry / exit hole of the pen barrel to prevent the nib from drying out, when the user writes using a press-type writing instrument, the nib of the pen nib protrudes to the outside of the pen barrel, moving the sealed assembly, causing the first and second protective plates to slide relative to each other, and further, the shielding plate is fed out from the pen barrel and rotates and opens on the outside of the pen barrel, thereby allowing the nib to protrude outwards. Since the shielding plate rotates and opens on the outside of the pen barrel and does not occupy space inside the pen barrel, the radial size of the pen barrel is effectively reduced, meeting the design requirements for smaller pen barrels, improving the grip of the writing instrument, and enhancing the user experience. [Brief explanation of the drawing]

[0007] To more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings used in the description of the embodiments or the prior art. Naturally, the following drawings are of some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these without requiring any creative effort. [Figure 1] This is a schematic diagram of the closed state in Embodiment 1 of the press-type writing instrument according to the present invention. [Figure 2] This is a schematic diagram of the open state in Embodiment 1 of the press-type writing instrument according to the present invention. [Figure 3] Figure 1 is an assembly diagram of the pen nib and sealing assembly. [Figure 4] Figure 2 is an assembly diagram of the pen nib and sealing assembly. [Figure 5] This is a local cross-sectional view of the closed state in Embodiment 1 of the press-type writing instrument according to the present invention. [Figure 6] Figure 5 is a localized, enlarged schematic diagram of region A. [Figure 7] This is a local cross-sectional view of the open state in Embodiment 1 of the press-type writing instrument according to the present invention. [Figure 8]It is a schematic enlarged view of the B region in FIG. 7. [Figure 9] It is a schematic enlarged view of the C region in FIG. 7. [Figure 10] It is a schematic configuration diagram of the pen refill in FIG. 1. [Figure 11] It is a partial cross-sectional view of the pen shaft in FIG. 1. [Figure 12] It is a partial cross-sectional view of the closed state in Embodiment 2 of the pressing-type writing instrument according to the present invention. [Figure 13] It is a schematic enlarged view of the M region in FIG. 12. [Figure 14] It is a partial cross-sectional view of the open state in Embodiment 2 of the pressing-type writing instrument according to the present invention. [Figure 15] It is an exploded perspective view of the pressing assembly and the pen refill in Embodiment 2 of the pressing-type writing instrument according to the present invention. [[ID=2*]]

Description of Reference Numerals

[0008] 1 Pen shaft 10 Positioning member 11 Access hole 12 Guide rib 13 Positioning rib \14 First relief groove 15 Second relief groove 2 Pen refill 21 Pen tip 22 First driving part 23 Second driving part 24 Protrusion 3 Spring 4 Sealing assembly 41 First protection plate 42 Second protection plate 43 Shielding plate 44 Connecting member 401 First flexible connecting part 402 Second flexible connecting part 403 Third flexible connecting part 411 First positioning protrusion 412 First elastic part 413 First protrusion 414 First hollow hole It should be noted that there seems to be a mistake in the original text where the item number for "

Description of Reference Numerals

Mode for carrying out the invention

[0009] In order to make the object, technical solution and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0010] <Embodiment 1> As shown in FIGS. 1 to 7, an embodiment of the present invention provides a pressing type writing instrument including a pen shaft 1, a pen core 2, a spring 3 and a sealing assembly 4.

[0011] An access hole 11 is provided at the tip of the pen shaft 1, and a pressing member (the entity representing the pressing member may have a conventional structure such as a pen cap) is arranged at the end of the pen shaft 1.

[0012] A pen tip 21 close to the access hole 11 is attached to the tip of the pen core 2, and the pen core 2 is slidably arranged in the pen shaft 1. The pressing member is configured such that when pressed and slid by the user, the pen core 2 is driven to slide in the pen shaft 1.

[0013] The spring 3 is positioned inside the pen shaft 1 and is configured to apply an elastic force to the pen tip 2 in a direction away from the inlet / outlet hole 11.

[0014] The sealed assembly 4 includes a first protective plate 41, a second protective plate 42, a shielding plate 43, and a connecting member 44. The first protective plate 41 and the second protective plate 42 have arc-shaped cross-sections and are arranged facing each other to form a mounting passage. The shielding plate 43 is positioned at the ends of the first protective plate 41 and the second protective plate 42, with a first flexible connecting portion 401 formed between it and the first protective plate 41. The connecting member 44 is positioned between the first protective plate 41 and the second protective plate 42, with a second flexible connecting portion 402 formed between one end of the connecting member 44 and the second protective plate 42, and a third flexible connecting portion 403 formed between the other end of the connecting member 44 and the shielding plate 43.

[0015] Here, the sealed assembly 4 is located inside the pen shaft 1, the pen nib 2 is located inside the mounting passage, and the shielding plate 43 is installed where the access hole 11 is located. When the pen nib 2 extends beyond the pen shaft 1, the first protective plate 41 and the second protective plate 42 move relative to each other, causing the shielding plate 43 to rotate and open on the outside of the pen shaft 1.

[0016] Specifically, during assembly, the first protective plate 41 and the second protective plate 42 of the sealed assembly 4 are positioned outside the pen nib 2, the sealed assembly 4 and the pen nib 2 are mounted inside the pen shaft 1, the shielding plate 43 is positioned where the inlet / outlet hole 11 is located, the pressing member contacts the pen nib 2, and the spring 3 is positioned inside the pen shaft 1 and pressed between the pen nib 2 and the pen shaft 1 to provide a restorative elastic force.

[0017] When the user needs to write using a press-type writing instrument during use, pressing the press member causes the nib 2 to slide outward within the pen barrel 1. As the nib 2 slides, the sealing assembly 4 moves together with it within the pen barrel 1, causing the shielding plate 43 to move outward from the entrance / exit hole 11, and simultaneously the nib 2 to move the first protective plate 41 and the second protective plate 42 relative to each other. The shielding plate 43 is positioned between the two protective plates using a flexible connection method. After the first protective plate 41 and the second protective plate 42 have moved relative to each other, on the one hand, the shielding plate 43 can rotate relative to the first protective plate 41 via the first flexible connection part 401, and on the other hand, the second protective plate 42 provides power for the shielding plate 43 to rotate toward the first protective plate 41 by the action of flexible connection parts formed at both ends of the connecting member 44, and finally the shielding plate 43 rotates outward from the pen barrel 1 and opens to expose the nib 21. This allows the user to write.

[0018] After the user has finished using the pen, pressing the pressing member again causes the pen tip 2 and sealing assembly 4 to move in the opposite direction due to the action of the spring 3, the pen tip 21 eventually returns to the pen shaft 1, and the shielding plate 43 returns to its original position to close the inlet / outlet hole 11.

[0019] Here, as the sealed assembly 2 slides within the pen shaft 1, the pen tip 21 protrudes from the entry / exit hole 11 to the outside of the pen shaft 1, the first protective plate 41 and the second protective plate 42 are sequentially positioned on the pen shaft 1 along the direction of movement of the pen nib 2. As the first protective plate 41 is positioned by the pen shaft 1 and the second protective plate 42 continues to move with the pen nib 2, the shielding plate 43 rotates outside the pen shaft 1 to open the mounting passage.

[0020] Specifically, in the initial stage of the process in which the pen nib 2 slides out, the first protective plate 41 and the second protective plate 42 move together with the pen nib 2, causing the shielding plate 43 to protrude from the inlet / outlet hole 11 and continue to move together with the pen nib 2. The first protective plate 41 is positioned by the pen shaft 1 and remains stationary, while the second protective plate 42 continues to move together with the pen nib 2, moving relative to the first protective plate 41, thereby driving the shielding plate 43 via the connecting member 44 to rotate and open.

[0021] By placing a sealed assembly in the pen barrel, and employing first and second protective plates positioned opposite the sealed assembly to form an installation passage for attaching the pen nib, and by using a shielding plate to seal the entry / exit hole of the pen barrel to prevent the nib from drying out, when the user writes using a press-type writing instrument, the nib of the pen nib protrudes to the outside of the pen barrel, moving the sealed assembly, causing the first and second protective plates to slide relative to each other, and further, the shielding plate is fed out from the pen barrel and rotates and opens on the outside of the pen barrel, thereby allowing the nib to protrude outwards. Since the shielding plate rotates and opens on the outside of the pen barrel and does not occupy space inside the pen barrel, the radial size of the pen barrel is effectively reduced, meeting the design requirements for smaller pen barrels, improving the grip of the writing instrument, and enhancing the user experience.

[0022] In some embodiments, a protruding positioning rib 13 is provided on the inner wall of the pen shaft 1, a first positioning projection 411 is provided on the outer wall of the first protective plate 41, and a second positioning projection 421 is provided on the outer wall of the second protective plate 42. When the pen tip 21 is retracted into the pen shaft 1, the distance between the first positioning projection 411 and the positioning rib 13 is smaller than the distance between the second positioning projection 421 and the positioning rib 13.

[0023] Specifically, in order to position the sealed assembly 4 in conjunction with the pen nib 2 in the first protective plate 41 and the second protective plate 42 in sequence, the first protective plate 41 and the second protective plate 42 are provided with a first positioning projection 411 and a second positioning projection 421, respectively. In order to position the pen nib 2 in sequence with the first protective plate 41 and the second protective plate 42 in sequence, the distances between the first positioning projection 411 and the second positioning projection 421 and the positioning rib 13 are designed to be different. As a result, in the process of the sealed assembly 4 moving together with the pen nib 2, the first positioning projection 411 contacts the positioning rib 13 first, positioning the first protective plate 41 so that it does not move together with the pen nib 2, and then the second positioning projection 421 moves a further distance and then contacts the positioning rib 13, positioning the second protective plate 42 so that it does not move together with the pen nib 2.

[0024] In another embodiment, a first elastic portion 412 is provided on the first protective plate 41, and a second elastic portion 422 is provided on the second protective plate 42. A first drive unit 22 and a second drive unit 23 are provided on the outer wall of the pen tip 2. The first drive unit 22 is configured to contact the free end of the first elastic portion 412 and apply thrust to the first protective plate 41 when the first protective plate 41 moves in conjunction with the pen tip 2 as it slides and extends. The second drive unit 23 is configured to contact the free end of the second elastic portion 422 and apply thrust to the second protective plate 42 when the second protective plate 42 moves in conjunction with the pen tip 2 as it slides and extends.

[0025] Specifically, in the initial stage of the process in which the pen nib 2 extends outward from the pen shaft 1, the first protective plate 41 and the second protective plate 42 move together in conjunction with the pen nib 2. However, after the first protective plate 41 and the second protective plate 42 are positioned by the positioning rib 13, the pen nib 2 slides independently. To ensure that the two protective plates move in conjunction with the pen nib 2, a first drive unit 22 and a second drive unit 23 are positioned on both sides of the pen nib 2, respectively. In the following description, we will explain as an example how the pen nib 2 drives the first protective plate 41 to move intermittently through the cooperation of the first drive unit 22 and the first elastic part 412. In the process in which the pressing member is pressed by the user and the pen nib 2 is driven to extend outward, the first drive unit 22 comes into contact with the first elastic part 412, and the first protective plate 41 is driven to move. After the first positioning projection 411 on the first protective plate 41 contacts the positioning rib 13, the first elastic part 412 deforms and detaches from the first drive unit 22, causing the pen tip 2 to continue moving. Similarly, the driving method between the second drive unit 23 and the second elastic part 422 is the same as described above, and therefore the explanation is omitted.

[0026] Here, the first drive unit 22 and the second drive unit 23 are groove structures formed on the outer wall of the pen nib 2. During use, taking the cooperation of the first drive unit 22 and the first elastic unit 412 as an example, as the first protective plate 41 moves in conjunction with the pen nib 2, the free end of the first elastic unit 412 is fitted into the groove structure. After the first protective plate 41 is positioned by the cooperation of the first positioning projection and the positioning rib 13, the free end of the first elastic unit 412 deforms due to the pressure of the groove structure and detaches from the groove structure.

[0027] Alternatively, the first drive unit 22 and the second drive unit 23 are convex structures formed on the outer wall of the pen nib 2. During use, taking the cooperation of the first drive unit 22 and the first elastic unit 412 as an example, as the first protective plate 41 moves in conjunction with the pen nib 2, the free end of the first elastic unit 412 is fitted to the outside of the convex structure. After the first protective plate 41 is positioned by the cooperation of the first positioning projection and the positioning rib 13, the free end of the first elastic unit 412 deforms due to the pressure of the convex structure and detaches from the convex structure.

[0028] Furthermore, in order to improve the smoothness of pressing, a first projection 413 is provided at the free end of the first elastic part 412, projecting toward the inner wall of the pen shaft 1, and a second projection 423 is provided at the free end of the second elastic part 422, projecting toward the inner wall of the pen shaft 1. A first relief groove 14 and a second relief groove 15 are provided on the inner wall of the pen shaft 1. The first relief groove 14 is configured such that the first elastic part 412 moves away from the first drive unit 22 when the first projection 413 is positioned within the first relief groove 14 after the first positioning projection 411 is fitted onto the positioning rib 13, and the second relief groove 15 is configured such that the second elastic part 422 moves away from the second drive unit 23 when the second projection 423 is positioned within the second relief groove 15 after the second positioning projection 421 is fitted onto the positioning rib 13.

[0029] Specifically, in order to improve the smoothness of the user's pressing when pressing the pressing member, a relief groove is formed in the inner wall of the pen shaft 1 to accommodate the elastic part after the protective plate has been positioned, thereby ensuring that the pen tip 2 can slide smoothly after the protective plate has been positioned. Let's take the first protective plate 41 as an example. When the pen tip 2 is pulled back, the first projection 413 comes into contact with the inner wall of the pen shaft 1, causing the first elastic part 412 to undergo elastic deformation in the direction of the pen tip 2, and the free end of the first elastic part 412 is fitted into the first drive unit 22. As the pen tip 2 slides outward, the first positioning projection 411 is fitted into the positioning rib 13, and then the first projection 413 slides into the first relief groove 14. The first elastic part 412 returns using its own elasticity and, by being positioned in the first relief groove 14, is automatically separated from the first drive unit 22. In this way, after the first protective plate 41 is positioned, the user can continue to press and move the pen tip 2 smoothly.

[0030] In one embodiment, the first protective plate 41 is provided with a first hollow hole 414, and a first elastic portion 412 is arranged in the first hollow hole 414. The second protective plate 42 is provided with a second hollow hole 424, and a second elastic portion 422 is arranged in the second hollow hole 424.

[0031] Specifically, in order to achieve a compact structural design, a first hollow hole 414 for accommodating the first elastic part 412 is formed in the first protective plate 41, and similarly, a second hollow hole 424 for accommodating the second elastic part 422 is formed in the second protective plate 42. This shortens the overall length of the sealed assembly 4 and satisfies the requirements for a compact structural design.

[0032] In another embodiment, as the pen nib 2 is pulled back into the pen shaft 1, a first tension portion 415 extending in the direction of the second protective plate 42 is provided at the end of the first protective plate 41 away from the inlet / outlet hole 11, and a second tension portion 425 extending in the direction of the first protective plate 41 is provided at the end of the second protective plate 42 away from the inlet / outlet hole 11, with the first tension portion 415 and the second tension portion 425 being positioned opposite each other. The outer wall of the pen nib 2 is provided with a protrusion 24 configured to sequentially pull the second tension portion 425 and the first tension portion 415 as the pen nib 2 slides back into place.

[0033] Specifically, in a press-type writing instrument in writing mode, when the user presses and releases the pressing member again, the pen tip 2 moves in the reverse direction due to the action of the spring 3 and returns to its original position. During the process of the pen tip 2 moving in the reverse direction, the protrusion 24 contacts the first tension portion 415 and the second tension portion 425 in sequence, and finally returns the first protective plate 41 and the second protective plate 42 to their original positions. In this process, when the protrusion 24 first contacts the first tension portion 415 and moves the first protective plate 41, the shielding plate 43 rotates in the reverse direction to shield the first protective plate 41 and the second protective plate 42, thereby forming a mounting passage. Next, the protrusion 24 contacts the second tension portion 425, and as the pen tip 2 continues to move, the protrusion 24 moves the first protective plate 41 and the second protective plate 42 in synchronous motion. As a result, the shielding plate 43 is pulled back to cover the entry / exit hole 11, and finally, the pen tip 2 and the sealing assembly 4 return to their original positions.

[0034] In one embodiment, a guide slide groove (not shown) is formed between the opposing edges of the first protective plate 41 and the second protective plate 42, the protrusion 24 is slidably positioned within the guide slide groove, and the first tension portion 415 and the second tension portion 425 are located at the ends of the guide slide groove away from the inlet / outlet hole 11.

[0035] In another embodiment, to improve airtightness, the press-type writing instrument further includes a sealing ring 5 mounted on the outside of the nib 2. The outer edge of the sealing ring 5 is attached to the inner wall of the pen barrel 1. When the nib 2 is retracted into the pen barrel 1, the shielding plate 43 seals the entry / exit hole 11, and the shielding plate 43 and the sealing ring 5 form a sealed space between the pen barrel 1 and the nib 2, with the nib 21 located within the sealed space.

[0036] Specifically, when the pen tip 2 is retracted, the entry / exit hole 11 is covered by the shielding plate 43, and the sealing ring 5 on the pen tip 2 contacts the inner wall of the pen shaft 1. As a result, the pen tip 21 forms a relatively sealed space within the area between the shielding plate 43 and the sealing ring 5 inside the pen shaft 1, thereby more effectively protecting the pen tip 21 from drying out.

[0037] <Embodiment 2> Based on Embodiment 1 described above, in the press-type writing instrument of Embodiment 2, a press assembly 6 is usually located inside the pen shaft 1, as shown in Figures 12 to 15, in order to realize a press-type operation.

[0038] Here, an inlet / outlet hole 11 is provided at the tip of the pen shaft 1, a plurality of guide ribs 12 are arranged on the inner wall of the end of the pen shaft 1, and a positioning member 10 is further arranged on the inner wall of the pen shaft 1. The guide ribs 12 extend along the longitudinal direction of the pen shaft 1 and are located outside the positioning member 10. A pen tip 21 is located at the tip of the pen nib 2, close to the inlet / outlet hole 11, and the pen nib 2 is slidably positioned within the pen shaft 1. The spring 3 is located within the pen shaft 1 and is configured to apply an elastic force to the pen nib 2 in a direction away from the inlet / outlet hole 11. The pressing assembly 6 includes a pressing member 61 slidably positioned at the end of the pen shaft 1 and having guide teeth 611 at its end, an extension rod 62 positioned on the pressing member 61 and in contact with the pen nib 2, and a movable gear 63 mounted on the outside of the extension rod 62 and positioned between the positioning member 10 and the guide teeth 611. The movable gear 63 is located between two adjacent guide ribs 12.

[0039] Specifically, during use by the user, the pen tip 2 is initially retracted into the pen barrel 1. When the pressing member 61 is pressed by the user, it receives stress and moves inward towards the pen barrel 1. When the pressing member 61 moves, the extension rod 62 moves simultaneously in conjunction with it, and the force is directly transmitted to the pen tip 2 by the extension rod 62.

[0040] Due to the action of the extension rod 62, the pen nib 2 overcomes the elastic force of the spring and moves within the pen barrel 1, and finally, the pen tip 21 protrudes to the outside of the pen barrel 1 through the inlet / outlet hole 11.

[0041] As the pen tip 2 moves in conjunction with the pressing member 61 via the extension rod 62, the guide teeth 611 slide along the guide ribs 12 provided on the inner wall of the pen shaft 1 and come into contact with the movable gear 63, causing the movable gear 63 to also slide along the guide ribs 12. During the sliding process, the teeth of the movable gear 63 disengage from between the two guide ribs 12. At this time, since the pen tip 2 is constantly pressed by the extension rod 62, the elastic force generated by the spring is not transmitted to the movable gear 63 via the pen tip 2, thereby preventing the movable gear 63 from bouncing up in the reverse direction. After the movable gear 63 disengages from between the two guide ribs 12, the tooth structure of the movable gear 63 continues to be pressed by the guide teeth 611, causing the movable gear 63 to rotate.

[0042] Here, the positional connection relationship between the movable gear 63 and related components changes depending on the state of use of the press-type writing instrument. Specifically, it is as follows:

[0043] When the pen nib 2 is retracted, a gap is formed between the movable gear 63 and the end of the pen nib 2 or the guide teeth 611.

[0044] Specifically, when the pen nib 2 is retracted, the movable gear 63 can move freely over a relatively short distance between the pen nib 2 and the guide teeth 611. For example, when the tip of the pen barrel 1 is pointing downwards, the movable gear 63 is attached to the pen nib 2 and a gap is formed between it and the guide teeth 611. When the end of the pen barrel 1 is pointing downwards, the movable gear 63 is attached to the guide teeth 611 and a gap is formed between it and the pen nib 2. In this way, when pressed by the user, the pen nib 2 is directly subjected to the pressure of the extension rod 62, but the movable gear 63 does not transmit the force to extend and move the pen nib 2.

[0045] When the pressing member 61 is in the maximum pressing stroke position, the movable gear 63 comes into contact with the positioning member 10.

[0046] Specifically, after the pressing member 61 is pressed to its lowest point by the user, the movable gear 63 is positioned by attaching to the positioning member 10, and the pressure of the movable gear 63 on the pen tip 2 is locked by the positioning member 10, thereby limiting the movement stroke of the movable gear 63.

[0047] Furthermore, when the pen tip 21 is extended and in the writing position, the feed 2 comes into contact with the movable gear 63, causing the movable gear 63 to be sandwiched between the feed 2 and the guide rib 12.

[0048] Specifically, in the writing state, the pressing member 61 is not subjected to any further stress, so the movable gear 63 is fitted into the guide rib 12 and positioned by the action of the spring under the pressure of the pen nib 2.

[0049] In some embodiments, the positioning member 10 is a positioning rib integrally formed on the inner wall of the pen shaft 1. Specifically, during the manufacturing process of the pen shaft 1, a positioning rib may be integrally formed on its inner wall, and this rib serves the role of the positioning member 10.

[0050] Alternatively, in another embodiment, the positioning member 10 is a positioning sleeve inserted into the pen shaft 1.

[0051] Alternatively, in another embodiment, the pen shaft is composed of an upper shaft body (not shown) and a lower shaft body (not shown), the upper shaft body and the lower shaft body are detachably connected, and the end face of the lower shaft body extending into the upper shaft body forms the positioning member.

[0052] In another embodiment, the free end of the extension rod 62 is provided with a pressing plate 621 that contacts the pen tip 2.

[0053] Specifically, to facilitate assembly, the extension rod 62 is provided with a pressing plate 621. During assembly, the movable gear 63 is mounted on the outside of the extension rod 62 and supported by the pressing plate 621. Next, the extension rod 62 is inserted into the pressing member 61 and fixed in place. The pressing member 61, extension rod 62, and movable gear 63 are assembled together and installed inside the pen shaft 1.

[0054] By positioning an extension rod on the pressing member of the pressing assembly and using the extension rod to contact the pen tip of the pen barrel, the extension rod applies force directly to the pen tip instead of the movable gear, causing the pen tip to slide within the pen barrel. As a result, when the user presses the pressing member during use, the extension rod always contacts the pen tip and applies pressure to the pen tip, and the elastic force from the spring is not transmitted to the movable gear via the pen tip. This also eliminates the impact noise generated when the pen is pressed, as the movable gear does not move in the opposite direction due to the action of elastic force when it separates from the end of the guide rib, thereby reducing impact noise and improving the user experience.

[0055] The final points to be explained are as follows: The embodiments described above are merely for illustrating the technical solutions of the present invention and do not limit the present invention. Although the present invention has been described in detail with reference to the embodiments described above, those skilled in the art can still modify the technical solutions described in each of the embodiments above, or substitute some of the technical features with equivalent ones. It should be understood that these modifications or substitutions will not deviate from the essence of the corresponding technical solutions and the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A pressure-type writing instrument, A pen shaft having an entry / exit hole at the tip and a pressing member positioned at the end, A pen tip is attached to the tip of the pen shaft, which is close to the entry / exit hole, and the pen core is slidably arranged within the pen shaft, and the pen core slides within the pen shaft when driven by the pressing member, A spring is disposed within the pen shaft and applies an elastic force to the pen core in a direction away from the insertion / removal hole, A sealed assembly comprising a first protective plate, a second protective plate, a shielding plate, and a connecting member, wherein the first protective plate and the second protective plate have arc-shaped cross-sections and are arranged opposite each other to form a mounting passage, the shielding plate is positioned at the ends of the first protective plate and the second protective plate and a first flexible connecting portion is formed between it and the first protective plate, the connecting member is positioned between the first protective plate and the second protective plate and a second flexible connecting portion is formed between one end of the connecting member and the second protective plate, and a third flexible connecting portion is formed between the other end of the connecting member and the shielding plate, A press-type writing instrument characterized in that the sealing assembly is located inside the pen shaft, the pen nib is located inside the mounting passage, the shielding plate is located at the entry / exit hole, and when the pen nib protrudes from the pen shaft, the shielding plate rotates and opens on the outside of the pen shaft by moving the first protective plate and the second protective plate relative to each other.

2. The press-type writing instrument according to claim 1, characterized in that, in the process in which the pen tip protrudes from the entry / exit hole to the outside of the pen shaft as the pen nib slides within the pen shaft, the first protective plate and the second protective plate are sequentially positioned on the pen shaft along the direction of movement of the pen nib, and in the process in which the first protective plate is positioned by the pen shaft and the second protective plate continues to move with the pen nib, the shielding plate rotates on the outside of the pen shaft to open the mounting passage.

3. The press-type writing instrument according to claim 1, wherein a protruding positioning rib is provided on the inner wall of the pen shaft, a first positioning projection is provided on the outer wall of the first protective plate, and a second positioning projection is provided on the outer wall of the second protective plate, and when the pen tip is retracted into the pen shaft 1, the distance between the first positioning projection and the positioning rib is smaller than the distance between the second positioning projection and the positioning rib.

4. The first protective plate is provided with a first elastic portion, and the second protective plate is provided with a second elastic portion. The press-type writing instrument according to claim 3, wherein a first drive unit and a second drive unit are arranged on the outer wall of the pen nib, the first drive unit is configured to contact the free end of the first elastic part and apply thrust to the first protective plate when the pen nib slides and protrudes and the first protective plate moves in conjunction with it, and the second drive unit is configured to contact the free end of the second elastic part and apply thrust to the second protective plate when the pen nib slides and protrudes and the second protective plate moves in conjunction with it,

5. The press-type writing instrument according to claim 4, characterized in that the first drive unit and the second drive unit are groove structures formed on the outer wall of the pen nib, or the first drive unit and the second drive unit are convex structures formed on the outer wall of the pen nib.

6. The free end of the first elastic portion is provided with a first projection that protrudes toward the inner wall of the pen shaft, and the free end of the second elastic portion is provided with a second projection that protrudes toward the inner wall of the pen shaft. The inner wall of the pen shaft is provided with a first relief groove and a second relief groove, the first relief groove is configured such that after the first positioning projection is fitted onto the positioning rib, the first projection is positioned within the first relief groove, causing the first elastic part to move away from the first drive part, and the second relief groove is configured such that after the second positioning projection is fitted onto the positioning rib, the second projection is positioned within the second relief groove, causing the second elastic part to move away from the second drive part, as described in claim 4.

7. The press-type writing instrument according to claim 6, characterized in that the first protective plate is provided with a first hollow hole in which the first elastic portion is disposed, and the second protective plate is provided with a second hollow hole in which the second elastic portion is disposed.

8. The press-type writing instrument according to claim 4, characterized in that a first tension portion extending in the direction of the second protective plate is provided at the end of the first protective plate away from the entrance / exit hole, and a second tension portion extending in the direction of the first protective plate is provided at the end of the second protective plate away from the entrance / exit hole, the first tension portion and the second tension portion are arranged to face each other, and the outer wall of the pen nib is provided with a convex portion configured to sequentially pull the second tension portion and the first tension portion during the process in which the pen nib slides and is pulled back.

9. The press-type writing instrument according to claim 8, characterized in that a guide slide groove is formed between the opposing edges of the first protective plate and the second protective plate, the protrusion is slidably arranged within the guide slide groove, and the first tension portion and the second tension portion are located at the end of the guide slide groove away from the inlet / outlet hole.

10. The press-type writing instrument according to claim 1, further comprising a sealing ring attached to the outside of the pen nib, the outer edge of the sealing ring being attached to the inner wall of the pen shaft, the shielding plate sealing the entry / exit hole when the pen nib is retracted into the pen shaft, the shielding plate and the sealing ring forming a sealed space between the pen shaft and the pen nib, and the pen tip being located within the sealed space.

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