Core receiving sealing structure of a pen

Abstract

The utility model discloses a kind of core collection sealing structures of pen, belong to pen field, the structure includes telescopic pen barrel assembly and writing tool, pen barrel assembly front end is equipped with core outlet, and writing tool is equipped with writing end. Between core outlet and writing end is equipped with sealing element, the middle part of sealing element is equipped with the passage that can be opened, pen barrel assembly outside sliding movable element, indirectly or directly transmission control sealing element displacement by the magnetic attraction or connecting rod mode of movable element and sealing element, realize passage expansion when core, automatically close when core collection Sealing. Effectively prevent ink evaporation, ink leakage and dust into, prolong writing life, and have optimized design such as ejector, reinforcing member, improve sealing reliability and operation smoothness.

Description

Technical Field

[0001] This utility model relates to the field of pens, specifically to a pen core sealing structure. Background Technology

[0002] Existing pen products (such as gel pens, ballpoint pens, and markers) typically employ a retractable structure to extend and retract the refill. However, in the retracted state, traditional retractable pens often lack an effective sealing structure between the pen tip and the refill opening, leading to the following problems: 1. Ink evaporation: When stored for a long time, the ink in the pen tip is prone to evaporation, which affects the smoothness of writing; 2. Risk of ink leakage: When the pen body is tilted or subjected to pressure, ink may leak from the lead outlet; 3. Dust intrusion: External dust can easily enter the pen through the ink outlet, contaminating the pen tip or clogging the ink flow channel; Therefore, there is an urgent need for a pen sealing structure that is simple in structure, reliable in sealing, and does not affect the normal lead feeding / retracting operation. Summary of the Invention

[0003] The purpose of this invention is to provide a pen core sealing structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A pen core sealing structure, the pen including a telescopic pen barrel assembly and a writing instrument, the writing instrument being placed inside the pen barrel assembly, and a return spring being provided between the writing instrument and the pen barrel assembly to complete the core retraction / extraction reset; The pen assembly is provided with a core outlet, and the writing instrument is provided with a writing end; The sealing structure includes a sealing element disposed between the core outlet and the writing end, and the sealing element has a channel in the middle that can be opened when the core is dispensing and closed when the core is retracted; A movable component is slidably connected to the outside of the pen assembly. The movable component directly or indirectly drives the seal to move inside the pen assembly to open or close the channel.

[0005] Preferably, the direct or indirect transmission with the seal includes direct mechanical transmission by fixing the seal and the movable part together via a connecting rod, or indirect magnetic transmission between the movable part and the seal by a magnetic attraction assembly.

[0006] Preferably, the magnetic attraction assembly includes an outer magnetic attraction component disposed inside the movable component; and an inner magnetic attraction component embedded in the annular groove of the sealing component, wherein the outer magnetic attraction component and the inner magnetic attraction component have a magnetic attraction.

[0007] Preferably, a pressure relief hole is provided at the tail of the outer rod or between the outer rod and the inner rod.

[0008] Preferably, an ejector with claw-shaped opening is provided between the seal and the writing end; and an ejector spring is provided between the ejector and the seal.

[0009] Preferably, the front end of the seal and the inner wall of the pen barrel assembly near the core outlet form an inclined slope sealing fit outer wall structure.

[0010] Preferably, the pen assembly includes an inner rod and an outer rod that are slidably connected, and the outer wall of the inner rod is provided with an active area defined by a limiting boss; the movable part is slidably connected to the active area.

[0011] Preferably, the resetting spring abutment surface is provided with a pad with an outer diameter larger than that of the writing instrument.

[0012] Preferably, the seal adopts any of the following structural combinations: a) Plastic elastomer structure: The main body is made of elastic plastic, and the central channel is opened and closed through an expansion joint; b) Soft material stacking structure: The main body is made of soft material, and the two ends are positioned by annular grooves and channel openings. When the core is closed, it is sealed by rotation or axial stacking.

[0013] Preferably, the seal with the soft material stack structure achieves dynamic sealing through the following structural method: Axial stacking structure: When the core is closed, the soft material is compressed and stacked along the axial direction of the pen barrel assembly; Rotary stacking structure: During core formation, the soft material is rotated, compressed, and stacked by a guide and a spiral track.

[0014] Preferably, a reinforcement is provided between the seal with a soft material stack structure and the writing end, the reinforcement being used to guide the opening of the channel and enhance the sealing pressure.

[0015] Preferably, the rotating stacking structure includes a guide on the outer wall of the seal and a spiral track on the inner wall of the pen assembly, with the guide slidably connected to the inner side of the spiral track.

[0016] Compared with the prior art, the beneficial effects of this utility model are: (i) Through the structural design of the sealing element and the external control of the moving parts, the channel is automatically closed when the core is retracted, ensuring a tight fit between the core outlet and the writing end, providing an efficient seal, preventing ink evaporation and dust intrusion, effectively protecting the pen tip and ink, reducing drying, ink leakage and contamination, significantly extending the service life of the writing instrument, and at the same time not affecting the core output of the writing end, ensuring smooth core output.

[0017] (ii) The displacement of the sealing element is controlled indirectly or directly by the magnetic attraction of the moving parts or the connecting rod. The channel opens automatically when the core is released and closes quickly when the core is retrieved. No additional manual operation of the sealing element is required, which is convenient and fast.

[0018] (iii) The sealing element is made of a material (such as plastic) or a soft material that can be squeezed and expanded in conjunction with the expansion joint under external force. It automatically closes the channel when the core is closed and opens the channel when the core is released. The structure is simple and the cost is low.

[0019] (iv) The inclined slope design makes the seal and the inner wall of the pen barrel assembly press tighter and tighter, further improving the sealing performance.

[0020] (v) Add ejector and ejector spring to avoid jamming of the seal and ensure smooth extension of the pen tip.

[0021] (vi) Utilize optional rotary stacking seals or reinforcements to adapt to different pen type requirements; (vii) The design of the pressure relief hole balances the internal and external air pressure, improving the smoothness of core feeding / receiving. The design of the gasket enhances the elastic pressure resistance.

[0022] (viii) The required force is less than that of other existing sealing structures because the present invention uses flexible parts and stacking methods, so a very good sealing effect can be achieved with less required force. Attached Figure Description

[0023] Figure 1 This is a three-dimensional exploded structural diagram of Embodiment 1 of this utility model.

[0024] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model.

[0025] Figure 3 This is a partially enlarged front cross-sectional view of Embodiment 1 of this utility model.

[0026] Figure 4 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 1 of this utility model.

[0027] Figure 5 This is a three-dimensional sectional exploded view of Embodiment 1 of the present invention.

[0028] Figure 6 This is a schematic diagram of the sliding hole structure in Embodiment 1 of this utility model.

[0029] Figure 7 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0030] Figure 8 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 2 of this utility model.

[0031] Figure 9 This is a three-dimensional structural diagram of the ejector component in Embodiment 2 of this utility model.

[0032] Figure 10 This is a three-dimensional structural diagram of the sealing element in Embodiment 2 of this utility model.

[0033] Figure 11 This is a three-dimensional sectional exploded view of Embodiment 2 of the present invention.

[0034] Figure 12 This is a three-dimensional structural diagram of Embodiment 3 of the present invention.

[0035] Figure 13 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 3 of this utility model.

[0036] Figure 14 This is a three-dimensional structural diagram of the sealing element in Embodiment 3 of this utility model.

[0037] Figure 15 This is a three-dimensional sectional exploded view of Embodiment 3 of the present invention.

[0038] Figure 16 This is a three-dimensional structural diagram of Embodiment 4 of the present invention.

[0039] Figure 17 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 4 of this utility model.

[0040] Figure 18 This is a three-dimensional structural diagram of the sealing element in Embodiment 4 of this utility model.

[0041] Figure 19 This is a three-dimensional structural diagram of the reinforcement component in Embodiment 4 of this utility model.

[0042] Figure 20 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 4 of this utility model.

[0043] Figure 21 This is a three-dimensional sectional exploded view of Embodiment 4 of the present invention.

[0044] Figure 22 This is a three-dimensional structural diagram of Embodiment 5 of the present invention.

[0045] Figure 23 This is a partially enlarged three-dimensional cross-sectional structural diagram of Embodiment 5 of this utility model.

[0046] Figure 24 This is a three-dimensional cross-sectional structural diagram of Embodiment 5 of this utility model.

[0047] Figure 25 This is a three-dimensional structural diagram of the sealing element in Embodiment 5 of this utility model.

[0048] Figure 26This is a partial cross-sectional structural diagram of the inner rod in Embodiment 5 of this utility model.

[0049] Figure 27 This is a three-dimensional sectional exploded view of Embodiment 5 of this utility model.

[0050] In the picture: Pen barrel assembly 1, writing instrument 2, lead outlet 1a, writing end 2b; Sliding hole 10, inner rod 11, outer rod 12, pressure relief hole 13, moving area 11a, limiting boss 11b, sealing element 3, channel opening 30, annular groove 31, guide element 32, spiral track 33, moving element 4, outer magnetic suction element 41, inner magnetic suction element 42, connecting rod 43, sealing ring 5, ejector element 6, ejector end 61, ejector spring 7, reinforcement element 8, outlet 80, gasket 9. Detailed Implementation Example 1

[0051] Please see Figures 1-6 This utility model provides a technical solution: A pen refill sealing structure is disclosed. The pen includes a telescopic pen barrel assembly 1 and a writing instrument 2. The writing instrument 2 is placed inside the pen barrel assembly 1, and a return spring is provided between the writing instrument 2 and the pen barrel assembly 1 to complete the refill / extension reset. The pen barrel assembly 1 consists of an inner rod 11 and an outer rod 12 that are detachably and slidably connected. For the structure that controls the inner rod 11 and outer rod 12 to prevent them from completely separating and affecting use while allowing them to slide a certain distance to meet the refill and extension requirements, and the structure that enables the pen to overcome the elasticity of the return spring for positioning when the refill is extended, please refer to the prior art, which will not be elaborated here. The writing instrument 2 can be a gel pen refill, marker pen refill, ballpoint pen refill, fountain pen refill, automatic lead refill, and / or direct-liquid refill.

[0052] The inner rod 11 of the pen assembly 1 is provided with a core outlet 1a at its front end, and the writing tool 2 is provided with a writing end 2b; The sealing structure includes a sealing element 3 disposed between the core outlet 1a and the writing end 2b. The sealing element 3 has a channel in its center that can be opened by the writing end 2b to communicate with the core outlet 1a. This channel has an automatic contraction capability under no external force to seal the core outlet 1a. Specifically, a channel opening 30 is provided on the side of the sealing element 3 near the core outlet 1a. Multiple expansion joints are formed along the outer circumference of the channel opening 30 on the outer wall of the sealing element 3. When the channel opening 30 is opened by the writing end 2b, the expansion joints provide space for the channel to expand, allowing the writing end 2b to pass through. The sealing element 3 can be made of plastic and has a certain degree of slight deformation capability, allowing it to be opened by external force with the expansion joints. Both the outer wall of the front end of the sealing element 3 and the inner wall of the front end of the inner rod 11 are inclined slopes. During sealing, the inclined slopes work together to tighten the seal.

[0053] The inner rod 11 is slidably connected to a movable member 4 on its outer side. The inner side wall of the sliding member 4 is provided with a pair of connecting rods 43 that play a control role. The outer wall of the inner rod 11 is provided with a sliding hole 10 for the connecting rods 43 to be inserted. The outer wall of the sealing member 3 away from the core outlet 1a is provided with an annular groove 31. The connecting rod 43 passes through the sliding hole 10 and extends into the annular groove 31. In this example, the annular groove 31 exists independently and is made of a material with a hardness higher than that of the sealing member 3. It is detachably and fixedly connected to the sealing member 3 (such as by a threaded connection). The outer wall of the inner rod 11 is fixedly provided with a limiting boss 11b, and the limiting boss 11b defines the active area 11a of the movable member 4 on the outer wall of the inner rod 11.

[0054] Both ends of the movable part 4 have a sealing ring 5 nested on the inner wall near the port. The sealing ring 5 increases the friction between the movable part 4 and the inner rod 11, which helps the movable part 4 move and position in the moving area 11a.

[0055] When the core is ejected, the external force controls the movable part 4 to move towards the outer rod 12. The connecting rod 43 drives the sealing part 3 to move synchronously, leaving a distance for the opening of the channel 30 and the inner wall of the front end of the inner rod 11. At this time, the movable part 4 contacts the limiting boss 11b. Further, by moving the movable part 4, the inner rod 11 is moved indirectly or directly, or the outer rod 12 is pressed, so that the writing end 2b overcomes the spring force of the return spring and approaches the core ejection port 1a. Then the writing end 2b will first squeeze the channel 30. Due to the expansion joint and the slight deformation ability of the sealing part 3 itself, the writing end 2 can open the channel 30 and extend from the core ejection port 1a to complete the core ejection state. When the core is retracted, the outer rod 12 automatically retracts under the elastic restoring force of the return spring and passes through the channel opening 30 into the interior of the seal 3. Then, the movable part 4 can be manually controlled or brought closer to the core outlet 1a by the return spring. The inclined slope of the seal 3 and the inner rod 11 contacts and is pressed together under the action of the return force. At the same time, without the writing end 2b pressing on the channel opening 30, the channel opening 30 automatically returns and contracts, thereby achieving a seal and preventing ink evaporation, ink leakage and dust entry, protecting the writing end 2b and extending the writing life. Example 2

[0056] Please see Figures 7-11 This utility model provides a technical solution: A pen refill sealing structure is disclosed. The pen includes a telescopic pen barrel assembly 1 and a writing instrument 2. The writing instrument 2 is placed inside the pen barrel assembly 1, and a return spring is provided between the writing instrument 2 and the pen barrel assembly 1 to complete the refill / extension reset. The pen barrel assembly 1 consists of an inner rod 11 and an outer rod 12 that are detachably and slidably connected. For the structure that controls the inner rod 11 and outer rod 12 to prevent them from completely separating and affecting use while allowing them to slide a certain distance to meet the refill and extension requirements, and the structure that enables the pen to overcome the elasticity of the return spring for positioning when the refill is extended, please refer to the prior art, which will not be elaborated here. The writing instrument 2 can be a gel pen refill, marker pen refill, ballpoint pen refill, fountain pen refill, automatic lead refill, and / or direct-liquid refill. The inner rod 11 of the pen assembly 1 is provided with a core outlet 1a at its front end, and the writing tool 2 is provided with a writing end 2b; The sealing structure includes a sealing element 3 disposed between the core outlet 1a and the writing end 2b. The sealing element 3 has a channel in its center that can be opened by the writing end 2b to communicate with the core outlet 1a. This channel has an automatic contraction capability under no external force to seal the core outlet 1a. Specifically, a channel opening 30 is provided on the side of the sealing element 3 near the core outlet 1a. Multiple expansion joints are formed along the outer circumference of the channel opening 30 on the outer wall of the sealing element 3. When the channel opening 30 is opened by the writing end 2b, the expansion joints provide space for the channel to expand, allowing the writing end 2b to pass through. The sealing element 3 can be made of plastic and has a certain degree of slight deformation capability, allowing it to be opened by external force with the expansion joints. Both the outer wall of the front end of the sealing element 3 and the inner wall of the front end of the inner rod 11 are inclined slopes. During sealing, the inclined slopes work together to tighten the seal.

[0057] The inner rod 11 is slidably connected to a movable part 4 on its outer side. The inner side wall of the sliding part 4 is provided with a pair of external magnetic suction parts 41 that play a control role. The outer side of the sealing part 3 is provided with an annular groove 31, and an inner magnetic suction part 42 is embedded in the annular groove 31. The outer wall of the inner rod 11 is fixedly provided with a limiting boss 11b, and the limiting boss 11b defines the movable area 11a of the movable part 4 on the outer wall of the inner rod 11.

[0058] An ejector 6 is also provided between the sealing element 3 and the writing end 2b. The two ends of the ejector 6 are a claw opening 60 and an ejection end 61, respectively. The ejection end 61 abuts against the return spring. The claw opening 60 is similar to the channel opening 30. Similarly, multiple expansion joints are opened on the outer side of the ejector 6, so that the claw opening 60 can be opened by being squeezed. In addition, an ejection spring 7 is provided between the sealing element 3 and the ejector 6. The ejection spring 7 controls the gap between the sealing element 3 and the ejector 6 to facilitate the opening of the claw opening 60. At the same time, the force transmission effect keeps the sealing element 3 from tilting when it is sealed. The ejector 6 can protect the pen tip. If the sealing element 3 is displaced and does not open in time, the channel opening 30 can be opened directly through the ejector 6.

[0059] When the core is ejected, the external force controls the movable part 4 to move closer to the outer rod 12. The magnetic attraction of the outer magnetic part 41 and the inner magnetic part 42 drives the sealing part 3 to move synchronously, leaving a distance for the opening of the channel 30 and the inner wall of the front end of the inner rod 11. At this time, the movable part 4 contacts the limiting boss 11b. Further, by moving the movable part 4, the inner rod 11 is moved indirectly or directly, or the outer rod 12 is pressed, so that the writing end 2b overcomes the spring force of the reset spring and approaches the core ejection port 1a. Then the writing end 2b will first squeeze the claw 60 to open it, and then squeeze the channel 30. By utilizing the expansion joint and the slight deformation ability of the sealing part 3 and the ejector 6, the writing end 2 can open the claw 60 and the channel 30 in sequence and extend from the core ejection port 1a to complete the core ejection state. When the core is retracted, the outer rod 12 automatically retracts under the elastic restoring force of the return spring, and passes through the channel opening 30 and the claw opening 60 to enter the ejector 6. Then, the movable part 4 can be manually controlled or brought closer to the core outlet 1a by the return spring. The sealing part 3 and the inclined slope of the inner rod 11 come into contact and are pressed together under the action of the return force. At the same time, the non-writing end 2b squeezes the channel opening 30 and the claw opening 60, and the channel opening 30 and the claw opening 60 automatically return and contract, thereby achieving a seal and preventing ink evaporation, ink leakage and dust entry, protecting the writing end 2b and extending the writing life.

[0060] Compared with Example 1, the difference is that the control of the sealing element 3 by the moving part 4 in this example is achieved by the non-contact external magnetic chuck 41 and internal magnetic chuck 42. Example 3

[0061] Please see Figures 12-15 This utility model provides a technical solution: A pen refill sealing structure is disclosed. The pen includes a telescopic pen barrel assembly 1 and a writing instrument 2. The writing instrument 2 is placed inside the pen barrel assembly 1, and a return spring is provided between the writing instrument 2 and the pen barrel assembly 1 to complete the refill / extension reset. The pen barrel assembly 1 consists of an inner rod 11 and an outer rod 12 that are detachably and slidably connected. For the structure that controls the inner rod 11 and outer rod 12 to prevent them from completely separating and affecting use while allowing them to slide a certain distance to meet the refill and extension requirements, and the structure that enables the pen to overcome the elasticity of the return spring for positioning when the refill is extended, please refer to the prior art, which will not be elaborated here. The writing instrument 2 can be a gel pen refill, marker pen refill, ballpoint pen refill, fountain pen refill, automatic lead refill, and / or direct-liquid refill.

[0062] The inner rod 11 of the pen assembly 1 is provided with a core outlet 1a at its front end, and the writing tool 2 is provided with a writing end 2b; The sealing structure includes a sealing element 3 disposed between the core outlet 1a and the writing end 2b. A channel opening 30 is provided on the side of the sealing element 3 near the core outlet 1a. The channel opening 30 is located outside the inner rod 11 and wraps around the core outlet 1a for positioning.

[0063] The inner rod 11 is slidably connected to a movable part 4 on its outer side. The inner side wall of the sliding part 4 is provided with a pair of external magnetic suction parts 41 that play a control role. The outer side of the sealing part 3 is provided with an annular groove 31. An internal magnetic suction part 42 is embedded in the annular groove 31. The main body of the sealing part 3, except for the channel opening 30 and the annular groove 31, is made of soft material, which can produce a stacked sealing effect. The outer wall of the inner rod 11 is fixedly provided with a limiting boss 11b, and the limiting boss 11b defines the active area 11a of the movable part 4 on the outer wall of the inner rod 11.

[0064] When the core is ejected, the external force controls the movable part 4 to move closer to the outer rod 12. The magnetic attraction of the outer magnetic part 41 and the inner magnetic part 42 drives the annular groove 31 to move synchronously. The soft material of the sealing part 3, which is stacked in the core ejection port 1a, is stretched and the internal channel of the sealing part 3 is opened. At this time, the movable part 4 contacts the limiting boss 11b. Further, by moving the movable part 4, the inner rod 11 is moved indirectly or directly, or the outer rod 12 is pressed, so that the writing end 2b overcomes the spring force of the reset spring and approaches the core ejection port 1a. Then the writing end 2b can pass through the opened internal channel of the sealing part 3 and extend out from the channel opening 30 to complete the core ejection state. When the core is retracted, the outer rod 12 automatically retracts under the elastic restoring force of the return spring and enters the pen through the internal channel of the opened seal 3. Then, the movable part 4 can be manually controlled or brought closer to the core outlet 1a by the return spring, the annular groove 31 is brought closer to the channel opening 30, and the main body of the seal 3 is stacked and sealed, thereby preventing ink evaporation, ink leakage and dust entry, protecting the writing end 2b and extending the writing life. Example 4

[0065] Please see Figures 16-21 This utility model provides a technical solution: Compared with Embodiment 3, the difference is that a reinforcement member 8 is provided between the sealing member 3 and the writing end 2b, and the reinforcement member 8 is provided with an outlet 80 on the side near the core outlet 1a. The reinforcement member 8 is made of a hard material.

[0066] When the core is ejected, the writing end 2b extends from the outlet 80 into the internal channel of the opened seal 3. The reinforcement 8 has the effect of widening the internal channel to facilitate the entry of the writing end 2b, so as to prevent the disordered and soft seal 3 from affecting the extension of the writing end 2b. When the core is retracted, the reinforcement 8 can further compress the seal 3 under the pressure of the return spring, so that the main body of the seal 3 is stacked more tightly and the sealing effect is improved. Example 5

[0067] Please see Figures 22-27 This utility model provides a technical solution: Compared with Embodiment 3, the difference is that a guide 32 is fixedly provided on the outer wall of the annular groove 31, and a spiral track 33 is provided on the inner wall of the front part of the inner rod 11, with the guide 32 slidably connected in the spiral track 33.

[0068] When the core is ejected, the magnetic attraction of the outer magnetic 41 and the inner magnetic 42 drives the annular groove 31 to move synchronously. Due to the cooperation of the guide 32 and the spiral track 33, the annular groove 31 moves along the spiral direction, thereby causing the soft material sealing member 3, which is rotated and stacked in the core ejection port 1a, to unfold and stretch, and the internal channel of the sealing member 3 opens. When the core is retracted, the annular groove 31 approaches the channel opening 30, and the guide 32 restricts its movement to only move along the spiral track 33 to approach the channel opening 30. The main body of the sealing member 3 rotates and stacks to seal, resulting in a stronger sealing effect. This better prevents ink evaporation, ink leakage, and dust from entering, protects the writing end 2b, and extends the writing life.

[0069] In addition, pressure relief holes 13 can be opened at the tail of the outer rod 11 in embodiments 4 and 5 above, or pressure relief holes 13 can be opened between the outer rod and the inner rod to facilitate air flow during the core feeding and core receiving process of the inner rod 11 and the outer rod 12, maintain the internal and external pressure balance, and not affect the smooth feeding / receiving of the core.

[0070] In embodiments 1-5 above, a washer 9 can be provided on the pressing contact surface of the return spring and the ejector spring 7, for example, see [reference needed]. Figure 27As shown, a shim 9 is provided between the return spring and the writing instrument 2. The outer diameter of the shim 9 is larger than the outer diameter of the writing instrument 2, and the outer edge is closer to the inner wall of the inner rod 11 without leaving too large a gap. The inner edge can be closer to the outer wall of the writing instrument 2. This makes it easier to prevent the elastic pressure from shifting and becoming uneven when the elastic force is applied, thus affecting the control of the core feeding / receiving.

[0071] Furthermore, embodiments 1-5 described above can also achieve normal opening of the channel and core ejection without using the limiting boss 11b for limiting, as well as control of core ejection / retraction between the outer rod 12 and the inner rod 11, by limiting the maximum deformation distance of the seal 3 itself.

Claims

1. A pen core sealing structure, the pen comprising a telescopic pen barrel assembly (1) and a writing tool (2), the writing tool (2) being placed inside the pen barrel assembly (1), and a reset spring being provided between the writing tool (2) and the pen barrel assembly (1) to complete the core retraction / extraction reset; The pen assembly (1) is provided with a core outlet (1a), and the writing tool (2) is provided with a writing end (2b); characterized in that: The sealing structure includes a seal (3) disposed between the core outlet (1a) and the writing end (2b), the seal (3) having a channel that can open when the core is dispensed and close when the core is retracted; The pen assembly (1) has a movable part (4) slidably connected to its outer side. The movable part (4) directly or indirectly drives the seal (3) to move inside the pen assembly (1) to open or close the channel.

2. The pen core sealing structure according to claim 1, characterized in that: The direct or indirect transmission with the seal (3) includes direct mechanical transmission by fixing the seal (3) and the movable part (4) together via a connecting rod (43), or indirect magnetic transmission between the movable part (4) and the seal (3) via a magnetic attraction assembly.

3. The pen core sealing structure according to claim 2, characterized in that: The magnetic attraction assembly includes an outer magnetic attraction member (41) disposed inside the movable member (4); and an inner magnetic attraction member (42) embedded in the sealing member (3), wherein the outer magnetic attraction member (41) and the inner magnetic attraction member (42) have a magnetic attraction between them.

4. The pen core sealing structure according to claim 1, characterized in that: The pen assembly (1) consists of an inner rod (11) and an outer rod (12) that are detachably and slidably connected. A pressure relief hole (13) is provided at the tail of the outer rod (12) or between the outer rod (12) and the inner rod (11).

5. The pen core sealing structure according to claim 1, characterized in that: An ejector (6) is provided between the sealing element (3) and the writing end (2b).

6. The pen core sealing structure according to claim 1, characterized in that: The front end of the seal (3) forms an inclined slope sealing structure with the inner wall of the pen barrel assembly (1) near the core outlet (1a).

7. The pen core sealing structure according to claim 1, characterized in that: The pen assembly (1) includes an inner rod (11) and an outer rod (12) that are slidably connected. The outer wall of the inner rod (11) is provided with an active area (11a) defined by a limiting boss (11b); the movable part (4) is slidably connected to the active area (11a).

8. The pen core sealing structure according to claim 1, characterized in that: The resetting spring abutting surface is provided with a pad (9) with an outer diameter larger than that of the writing instrument (2).

9. A pen core sealing structure according to any one of claims 1-8, characterized in that: The seal (3) adopts any of the following structural combinations: a) Plastic elastomer structure: The main body is made of elastic plastic, and the central channel is opened and closed through an expansion joint; b) Soft material stacking structure: The main body is made of soft material, and sealing is achieved by rotation or axial stacking when the core is closed.

10. The core-sealing structure according to claim 9, characterized in that: The sealing element (3) with the soft material stack structure achieves dynamic sealing through the following structural method: Axial stacking structure: When the core is closed, the soft material is compressed and stacked along the axial direction of the pen barrel assembly (1); Rotary stacking structure: When the core is collected, the soft material is rotated, compressed and stacked by the cooperation of the guide (32) and the spiral track (33).

11. The core-sealing structure according to claim 9, characterized in that: A reinforcement member (8) is provided between the seal (3) of the soft material stack structure and the writing end (2b), the reinforcement member (8) being used to guide the opening of the channel and enhance the sealing pressure.

12. The pen core sealing structure according to claim 10, characterized in that: The rotating stacking structure includes a guide (32) on the outer wall of the seal (3) and a spiral track (33) on the inner wall of the pen assembly (1), with the guide (32) slidably connected to the inner side of the spiral track (33).

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