Needle tube spring refill and pen
By setting a bushing in the needle spring refill to protect the ball seat body, the problem of bending and deforming the pen tip when impacted is solved, extending the service life of the refill and maintaining the writing performance.
Patent Information
- Application Number
- CN202421475907.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-25
AI Technical Summary
When using a pen with a needle-type spring refill core, if the pen falls or is impacted, the pen tip is prone to bend and deform, resulting in the spring failure and the writing cannot be written normally.
A needle spring refill is designed. By setting up a bushing, it is fixedly connected to the ink tube assembly close to the end of the ball bead, ensuring that the bushing sleeve is arranged outside the ball body, thereby providing protection to the ball body. When the refill falls, part of the impact force will be transferred to the bushing, reducing the risk of bending and deformation of the ball body.
It effectively extends the service life of the needle spring refill core, reduces the risk of spring failure, ensures that the pen tip can remain in an effective state after being impacted, and ensures writing performance.
Smart Images
Figure CN222859079U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of writing tools, and in particular to a needle spring pen core and a pen. Background Art
[0002] Ballpoint pens are common writing tools. As consumers have higher and higher requirements for product functions and applicability, ballpoint pen refills are constantly being updated, from the earliest ink refills to the later water-based ink refills and gel ink refills, and the writing performance of the products has gradually improved. One of the important parts of the refill is the pen tip, which can be a spring-loaded or non-spring-loaded pen tip. Needle-tube spring refills with thinner nibs are favored by consumers for their thin nib diameter and narrow writing lines.
[0003] However, when using a pen equipped with a needle-tube spring refill, if the pen falls to the ground or is subjected to other impact forces, the pen tip is prone to bend and deform, causing the spring to fail and unable to hold the ball tightly, thereby preventing normal writing. Utility Model Content
[0004] The purpose of the present disclosure is to provide a needle tube spring pen core and a pen, so as to increase the service life of the needle tube spring pen core.
[0005] Based on the above purpose, the present disclosure provides a needle tube spring pen core, including a pen tip, an ink tube assembly and a bushing, the pen tip including a ball seat body, a spring and a ball, the ball seat body has a front end and a rear end, the ball is installed at the front end of the ball seat body, the spring is installed inside the ball seat body, and the spring abuts against the ball; the ink tube assembly is connected to the rear end of the ball seat body; the bushing is sleeved on the outside of the ball seat body, and the bushing is fixedly connected to one end of the ink tube assembly close to the ball.
[0006] In one embodiment of the present disclosure, the distance between one end of the bushing close to the ball and the front end of the ball seat body is no more than 1 / 3 of the axial length of the ball seat body.
[0007] In one embodiment of the present disclosure, the ball seat body is made of stainless steel, and the Vickers hardness of the ball seat body is 180-220HV; the interior of the ball seat body is provided with a flow channel for ink to flow from the rear end to the front end, and the front end of the ball seat body converges inward to form a bowl mouth, and the ball is limited to the bowl mouth; the end face of the bowl mouth is an annular surface, and the radial width of the annular surface is less than 15μm.
[0008] In one embodiment of the present disclosure, the bushing includes a first fixed section, a coupling section and a second fixed section, one end of the first fixed section is connected to one end of the coupling section, and the other end of the coupling section is connected to the second fixed section; the first fixed section is sleeved on the outside of the ball seat body, and the second fixed section is sleeved on the outside of the ink tube assembly.
[0009] In one embodiment of the present disclosure, the ink tube assembly includes a connecting tube and an ink storage tube, one end of the connecting tube is connected to the ball seat body, and the other end of the connecting tube is connected to the ink storage tube; the second fixed section is sleeved on the outside of the connecting tube.
[0010] In one embodiment of the present disclosure, a circumferential outer surface of the connecting pipe is provided with reinforcing ribs, and the reinforcing ribs abut against an inner surface of the second fixing section.
[0011] In one embodiment of the present disclosure, the reinforcing rib is an annular protrusion; or, the reinforcing rib includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the connecting pipe.
[0012] In one embodiment of the present disclosure, the engagement segment is a hollow truncated cone structure, the hollow truncated cone structure has a first end and a second end opposite to each other, the diameter of the first end is smaller than the diameter of the second end, the first end is connected to the first fixing segment, and the second end is connected to the second fixing segment;
[0013] Alternatively, the engagement section is an annular plate structure, an inner ring edge of the annular plate structure is connected to the first fixing section, and an outer ring edge of the annular plate structure is connected to the second fixing section.
[0014] In one embodiment of the present disclosure, the first fixing section, the engaging section and the second fixing section are integrally formed.
[0015] In one embodiment of the present disclosure, the bushing is made of metal.
[0016] In one embodiment of the present disclosure, a limiting portion is provided on the inner surface of the ball seat body, one end of the spring abuts against the limiting portion, and the other end of the spring abuts against the ball.
[0017] Based on the above purpose, the present disclosure also provides a pen, including the needle tube spring pen core.
[0018] The beneficial effects of the present disclosure are mainly:
[0019] The needle tube spring pen core provided by the present invention is provided with a bushing, which is fixedly connected to the end of the ink tube assembly close to the ball, ensuring that the bushing is sleeved on the outside of the ball seat body, thereby protecting the ball seat body. When the pen core falls, at least part of the impact force on the pen head will be transferred to the bushing, effectively reducing the risk of bending and deformation of the ball seat body, thereby maintaining the shape of the spring inside the ball seat body, effectively reducing the risk of spring failure, and thus extending the service life of the needle tube spring pen core. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 A schematic diagram of the structure of a needle spring pen core provided in an embodiment of the present disclosure;
[0022] Figure 2 A half-section view of a needle spring pen core provided in an embodiment of the present disclosure;
[0023] Figure 3 for Figure 2 A partial enlarged view of point Ⅰ in the middle;
[0024] Figure 4 It is a schematic diagram of the structure of the pen tip in the embodiment of the present disclosure;
[0025] Figure 5 for Figure 4 A cross-sectional view along line AA;
[0026] Figure 6 A half-section diagram of a pen tip in an embodiment of the present disclosure;
[0027] Figure 7 is a schematic structural diagram of a bushing in an embodiment of the present disclosure;
[0028] Figure 8 is a half-section diagram of a bushing in an embodiment of the present disclosure;
[0029] Fig. 9 It is a structural schematic diagram of a connecting pipe in an embodiment of the present disclosure;
[0030] Fig.10 is a half-section diagram of a connecting pipe in an embodiment of the present disclosure;
[0031] Fig.11 for Fig.10 A partial enlarged view of point II.
[0032] The following are the descriptions of the reference numerals:
[0033] 1-pen tip; 11-ball seat body; 111-bowl edge; 112-limiting part; 12-spring; 13-ball; 2-ink tube assembly; 21-connecting tube; 211-first limiting boss; 212-second limiting boss; 213-reinforcing rib; 22-ink storage tube; 3-bushing; 31-first fixing section; 32-joining section; 33-second fixing section. DETAILED DESCRIPTION
[0034] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.
[0035] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0036] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0037] See also Figures 1 to 11 As shown, this embodiment provides a needle tube spring pen core, including a pen tip 1, an ink tube assembly 2 and a bushing 3. The pen tip 1 includes a ball seat body 11, a spring 12 and a ball 13. The ball seat body 11 has a front end and a rear end. The ball 13 is installed at the front end of the ball seat body 11, and the spring 12 is installed inside the ball seat body 11. The spring 12 abuts against the ball 13; the ink tube assembly 2 is connected to the rear end of the ball seat body 11; the bushing 3 is sleeved on the outside of the ball seat body 11, and the bushing 3 is fixedly connected to one end of the ink tube assembly 2 close to the ball 13.
[0038] The needle tube spring pen core provided in this embodiment is provided with a bushing 3, and the bushing 3 is fixedly connected to the end of the ink tube assembly 2 close to the ball 13, so as to ensure that the bushing 3 is sleeved on the outside of the ball seat body 11, thereby protecting the ball seat body 11. When the pen core falls, at least part of the impact force on the pen head 1 will be transferred to the bushing 3, which effectively reduces the risk of bending and deformation of the ball seat body 11, thereby maintaining the shape of the spring 12 inside the ball seat body 11, effectively reducing the risk of failure of the spring 12, and thus extending the service life of the needle tube spring pen core.
[0039] In one embodiment, the ball seat body 11 is made of stainless steel, and the Vickers hardness of the ball seat body 11 is 180-220HV; the interior of the ball seat body 11 is provided with a flow channel for ink to flow from the rear end to the front end, and the front end of the ball seat body 11 converges inward to form a bowl mouth, and the ball 13 is limited to the bowl mouth; the end face of the bowl mouth is an annular surface, and the radial width w of the annular surface is less than 15μm.
[0040] Exemplarily, the ball seat body 11 is made of stainless steel pipe; the stainless steel pipe can be one of 304, 304L, 316, 316L, and is processed by conventional quenching and tempering process to control the Vickers hardness of the stainless steel pipe to 180-220HV; the stainless steel pipe is cut into short billets by a blanking machine, and then processed by a fully automatic multi-station pen tip machine to form the ball seat body 11, and the toughness of the ball seat body 11 is good; at the same time, see Figure 5 As shown, the radial width w of the end face of the bowl mouth (i.e., the bowl edge 111) is less than 15 μm, that is, the thickness of the bowl edge is less than 15 μm. Therefore, the bowl edge 111 has a small thickness and good toughness, and can restore the circular shape with continued writing. That is, the bowl edge 111 has a certain elastic recovery ability. When the pen core or the pen with the pen core is impacted, if the bowl edge 111 is deformed, the elastic recovery ability of the bowl edge 111 can allow its own shape to restore the circular shape with continued writing.
[0041] Due to the provision of the bushing 3, when the bowl edge 111 is deformed by impact, the ball seat body 11 will not be obviously bent or deformed because it is supported and protected by the bushing 3, thereby not causing failure of the spring 12, ensuring that the spring 12 can abut against the ball 13 to prevent ink leakage.
[0042] In one embodiment, see Figure 6 As shown, a limiting portion 112 is provided on the inner surface of the ball seat body 11 , one end of the spring 12 abuts against the limiting portion 112 , and the other end of the spring 12 abuts against the ball 13 .
[0043] Exemplarily, the stopper 112 may include two convex points, which are arranged opposite to each other along the radial direction of the ball seat body 11. For example, the ball seat body 11 may be stamped to form convex points at corresponding positions, and after stamping, the outer surface of the ball seat body 11 forms a depression corresponding to the position of the convex points.
[0044] For example, the material of the spring 12 in this embodiment is spring steel; the spring 12 is fixed inside the ball seat body 11 in an embedded manner, one end of the spring 12 abuts against the convex point, and the other end abuts against the ball 13. In the non-writing state, the ball 13 is in a top ball state, which plays a sealing role. In the writing state, the ball 13 presses the spring 12 inward, and a gap is formed between the ball 13 and the bowl edge 111, and the ink flows out from the rear end to the front end through the flow channel and the gap.
[0045] In order to provide good protection for the pen tip 1, the distance between the end of the bushing 3 close to the ball 13 and the front end of the ball seat body 11 is less than half of the axial length of the ball seat body 11. When impacted, the bushing 3 can protect most of the ball seat body 11, thereby effectively reducing the risk of the ball seat body 11 bending.
[0046] In order to further provide good protection for the pen tip 1, see Figure 3 As shown, the distance d between the end of the bushing 3 close to the ball 13 and the front end of the ball seat body 11 is not greater than 1 / 3 of the axial length of the ball seat body 11.
[0047] In one embodiment, the bushing 3 is made of metal.
[0048] In some embodiments, the material of the bushing 3 can be the same as the material of the ball seat body 11 .
[0049] In other embodiments, the material of the bushing 3 may be different from that of the ball seat 11. In this case, a metal layer may be plated on the outer surface of the bushing 3 to ensure that the color of the outer surface of the bushing 3 is the same or close to that of the outer surface of the ball seat 11, thereby ensuring that the appearance of the entire pen core is more beautiful.
[0050] Exemplarily, the material of the bushing 3 may be, but is not limited to, stainless steel or copper alloy. For example, when the bushing 3 is made of copper alloy, the outer surface of the bushing 3 may be plated with chrome.
[0051] In this embodiment, see Figure 1 As shown, the ink tube assembly 2 includes a connecting tube 21 and an ink storage tube 22. One end of the connecting tube 21 is connected to the ball seat body 11, and the other end of the connecting tube 21 is connected to the ink storage tube 22. The ink in the ink storage tube 22 flows into the pen head 1 through the connecting tube 21 to ensure normal ink discharge.
[0052] Exemplarily, one end of the connecting tube 21 is sleeved on the outside of the ball seat body 11 and has an interference fit with the ball seat body 11 to prevent the ball seat body 11 from falling off and achieve sealing at the same time; the other end of the connecting tube 21 is inserted into the ink storage tube 22 and has an interference fit with the ink storage tube 22, forming a seal between the connecting tube 21 and the ink storage tube 22 to prevent ink leakage.
[0053] See also Fig.11 As shown, a first limiting boss 211 is provided on the circumferential outer surface of the connecting tube 21 , and the first limiting boss 211 abuts against the end surface of the ink storage tube 22 to limit the position of the connecting tube 21 .
[0054] A second limiting boss 212 is disposed on the inner surface of the connecting tube 21 , and the second limiting boss 212 abuts against an end of the ball seat body 11 away from the ball 13 to prevent the ball seat body 11 from retracting.
[0055] Exemplarily, the material of the connecting tube 21 may be polypropylene.
[0056] See also Figure 7 and Figure 8 As shown, the bushing 3 includes a first fixed section 31, a coupling section 32 and a second fixed section 33, one end of the first fixed section 31 is connected to one end of the coupling section 32, and the other end of the coupling section 32 is connected to the second fixed section 33; the first fixed section 31 is sleeved on the outside of the ball seat body 11, and the second fixed section 33 is sleeved on the outside of the ink tube assembly 2.
[0057] Exemplarily, the first fixing section 31 , the engaging section 32 and the second fixing section 33 are integrally formed.
[0058] The inner diameter of the first fixing section 31 is slightly larger than the outer diameter of the ball seat body 11 for easy assembly. The second fixing section 33 is sleeved on the outside of the ink tube assembly 2. It should be understood that a portion of the ink tube assembly 2 is located in the second fixing sleeve, and the outer diameter of the portion is slightly smaller than the inner diameter of the second fixing section 33 for easy assembly.
[0059] It should be noted that the material of the bushing 3 can also be hard plastic. In this case, the bushing 3 and the ball seat body 11 can be interference fit, so that the impact force on the pen tip 1 can be completely transferred to the bushing 3, and the risk of bending and deformation of the ball seat body 11 can be effectively reduced.
[0060] In some embodiments, see Figure 8 As shown, the joining section 32 is a hollow frustum-shaped structure having a first end and a second end opposite to each other. The diameter of the first end is smaller than the diameter of the second end. The first end is connected to the first fixing section 31 , and the second end is connected to the second fixing section 33 .
[0061] In this embodiment, the second fixed section 33 is sleeved on the outside of the connecting tube 21, and a portion of the end of the connecting tube 21 close to the ball 13 is located in the second fixed sleeve. Since the connecting section is a hollow cone-shaped structure, it can reserve accommodation space for the end of the connecting tube 21 located in the second fixed sleeve.
[0062] In other embodiments, the engagement section 32 may also be an annular plate structure, the inner ring edge of the annular plate structure is connected to the first fixing section 31, and the outer ring edge of the annular plate structure is connected to the second fixing section 33. In this case, the annular plate structure may abut against the end of the connecting pipe 21 located in the second fixing sleeve, or there may be a gap between the two.
[0063] In one embodiment, the circumferential outer surface of the connecting tube 21 is provided with reinforcing ribs 213 , and the reinforcing ribs 213 abut against the inner surface of the second fixing section 33 , so that the bushing 3 can be effectively fixed to prevent the substrate from falling off due to impact.
[0064] In some embodiments, the reinforcing rib 213 is an annular protrusion.
[0065] In other embodiments, the reinforcing rib 213 includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the connecting tube 21 .
[0066] This embodiment also provides a pen, including the needle tube spring pen core provided in this embodiment.
[0067] The pen provided in this embodiment uses the needle tube spring pen core provided in this embodiment, which ensures that the bushing 3 is sleeved on the outside of the ball seat body 11, thereby protecting the ball seat body 11. When the pen core falls, at least part of the impact force on the pen head 1 will be transferred to the bushing 3, effectively reducing the risk of bending and deformation of the ball seat body 11, thereby maintaining the shape of the spring 12 inside the ball seat body 11, effectively reducing the risk of spring failure, and extending the service life of the needle tube spring pen core, thereby extending the service life of the pen.
[0068] Embodiment 1
[0069] The reinforced high-toughness needle spring pen core provided in this embodiment adopts pigment neutral black ink A, hereinafter referred to as pen core A, and the total length of its spring pen tip is 6.55mm. The ball 13 is made of tungsten carbide alloy and has a diameter of 0.5mm. The spring 12 is installed in an embedded manner inside the ball seat body 11, and the two ends respectively resist the ball 13 and the limit part 112. The ball seat body 11 is made of 304 stainless steel pipe with an outer diameter of 1.0mm and an inner diameter of 0.7mm, and the Vickers hardness of the pipe is 210~220HV; the stainless steel pipe is cut into short blanks by a blanking machine, and then processed by a fully automatic multi-station pen tip machine.
[0070] The bowl edge 111 of the ball seat body 11 has a thickness of 12 to 14 μm. After the entire pen is impacted, if the bowl edge 111 is deformed by force, it can return to a circular shape as writing continues due to its small thickness and good toughness, and has a certain elastic recovery ability.
[0071] The parameters of the spring 12 include: free length of 6.0 mm, wire diameter of 0.100 mm, outer diameter of 0.64 mm, and designed elastic force of 20 to 30 gf / mm.
[0072] The bushing 3 is made of stainless steel. The inner diameter of the first fixing section 31 of the bushing 3 is 1.05 mm, and the distance between the first fixing section 31 and the front end of the ball seat body 11 is 1.8 mm, which can provide sufficient support for the pen tip 1 and reduce the risk of bending. The inner diameter of the second fixing section 33 is 1.85 mm.
[0073] The maximum diameter of the middle part of the reinforcing rib 213 on the connecting tube 21 is 1.88 mm, and the size of the two sides is smaller, which is 1.80 mm. This design can ensure that the reinforcing rib 213 is combined with the second fixing section 33 of the bushing 3 to fix the bushing 3 and prevent the bushing 3 from falling off due to impact. The inner diameter of the front end of the connecting tube 21 is designed to be 0.95 mm, which is an interference fit with the pen tip, and a step with a diameter of 0.75 mm is provided to prevent the ball seat body 11 from retracting. The rear end of the connection is adapted to the ink storage tube 22, and the contents of the ink storage tube 22 flow into the pen tip 1 through the connection to ensure normal ink output.
[0074] The matching test of refill A yielded the following results:
[0075] 1. Pigment neutral black ink A: The viscosity of pigment neutral black ink A was measured at different rotation speeds using a rotational viscometer, wherein a rotation speed of 6 r / min corresponds to a viscosity of 1960 mPa·s, and a rotation speed of 60 r / min corresponds to a viscosity of 682 mPa·s; the surface tension was 39.4 mN / m, the pH value was 8.92, and the ink particle size D50 was 128 nm, wherein the ink particle size D50 refers to the particle size corresponding to a cumulative particle size distribution percentage of a sample reaching 50%; the test conditions: German HUTT writing instrument, the writing angle was 70°, the writing speed was 4.5 m / min, and the writing pressure was 1 N.
[0076] 2. The test results of writing performance are as follows: the pen core with an ink filling volume of 1.05g has good initial writing performance, an average ink output of 95mg / 100m, a line length of 1050-1200m, a wear amount of 0.008mm, normal writing lines, no ink accumulation on the pen tip and lines, and the writing performance meets the national standard requirements for gel pen cores; other application performance such as intermittent writing, ink dripping, anti-bottoming and ink leakage, high temperature storage, low temperature resistance, and drying resistance all meet the requirements of national standards, industry standards, or enterprise standards.
[0077] Special experiments were conducted on refill A and the existing common needle spring refill (hereinafter referred to as refill C), and the results were compared. The comparison results are shown in Table 1:
[0078] Table 1 Comparison results of refill A and refill C (0.5mm)
[0079]
[0080] Among them, the 1m impact destruction test is designed to make the pen head 1 have a destructive impact with the steel plate. The pen core is loaded into the finished pen, the weight of the whole pen is 13g, and the impact angle is 45°, so as to deform and dent the bowl mouth, and verify the deformation and rebound ability through continuous writing.
[0081] As can be seen from Table 1, compared with the refill C, the ball seat of refill A has lower hardness and better toughness, and the bowl edge 111 has strong rebound ability after impact, and the setting of the bushing 3 reduces the bending risk of the ball seat 11. In addition, it also has the advantages of good writing feel and small writing wear, that is, the low hardness of the ball seat does not lead to increased wear.
[0082] Embodiment 2
[0083] The reinforced high-toughness needle spring pen core provided in this embodiment adopts pigment neutral black ink B, hereinafter referred to as pen core B, and the total length of its spring pen tip is 6.55mm. The ball 13 is made of tungsten carbide alloy with a diameter of 0.4mm. The spring 12 is installed in an embedded manner inside the ball seat body 11, and the two ends respectively resist the ball 13 and the limit part 112. The ball seat body 11 is made of 316L stainless steel pipe with an outer diameter of 0.8mm and an inner diameter of 0.52mm, and the Vickers hardness of the pipe is 190~200HV; the stainless steel pipe is cut into short blanks by a blanking machine, and then processed by a fully automatic multi-station pen tip machine.
[0084] The thickness of the bowl edge 111 of the ball seat body 11 is 10-12 μm. After the whole pen is impacted, if the bowl edge 111 is deformed by force, it can return to a circular shape as writing continues due to its small thickness and good toughness, and has a certain elastic recovery ability.
[0085] The parameters of the spring 12 include: a free length of 6.0 mm, a wire diameter of 0.08 mm, an outer diameter of 0.48 mm, and a designed elastic force value of 15 to 20 gf / mm.
[0086] The bushing 3 is made of nickel brass alloy. The inner diameter of the first fixing section 31 of the bushing 3 is 0.85 mm, and the distance between the first fixing section 31 and the front end of the ball seat body 11 is 1.8 mm, which can provide sufficient support for the pen tip 1 and reduce the risk of bending. The inner diameter of the second fixing section 33 is 1.85 mm.
[0087] The maximum diameter of the middle part of the reinforcing rib 213 on the connecting tube 21 is 1.88 mm, and the size of the two sides is smaller, which is 1.80 mm. This design can ensure that the reinforcing rib 213 is combined with the second fixing section 33 of the bushing 3 to fix the bushing 3 and prevent the bushing 3 from falling off due to impact. The inner diameter of the front end of the connecting tube 21 is designed to be 0.75 mm, which is an interference fit with the pen tip, and a step with a diameter of 0.6 mm is provided to prevent the ball seat body 11 from retracting. The rear end of the connection is adapted to the ink storage tube 22, and the contents of the ink storage tube 22 flow into the pen tip 1 through the connection to ensure normal ink output.
[0088] The matching test of refill B yielded the following results:
[0089] 1. Pigment neutral black ink B: The viscosity of pigment neutral black ink B was measured at different rotation speeds using a rotational viscometer, where the viscosity corresponding to a rotation speed of 6 r / min was 1460 mPa·s, and the viscosity corresponding to a rotation speed of 60 r / min was 292 mPa·s; the surface tension was 37.2 mN / m, the pH value was 8.66, and the ink particle size D50 was 70 nm; the test conditions were: German HUTT writing instrument, the writing angle was 70°, the writing speed was 4.5 m / min, and the writing pressure was 1 N;
[0090] 2. The test results of writing performance are as follows: the pen core with an ink filling volume of 1.05g has good initial writing performance, an average ink output of 90mg / 100m, a line length of 1000-1300m, a wear amount of 0.012mm, normal writing lines, no ink accumulation on the pen tip and lines, and the writing performance meets the national standard requirements for gel pen cores; other application performance such as intermittent writing, ink dripping, anti-bottoming and ink leakage, high temperature storage, low temperature resistance, and drying resistance all meet the requirements of national standards, industry standards, or enterprise standards.
[0091] A special experiment was conducted on the refill B and the existing non-spring pen tip needle refill (hereinafter referred to as refill D), and the results were compared. The comparison results are shown in Table 2:
[0092] Table 2 Comparison results of refill B and refill D (0.4 mm)
[0093]
[0094]
[0095] Among them, the 1m impact destruction test is designed to make the pen head 1 have a destructive impact with the steel plate. The pen core is loaded into the finished pen, the weight of the whole pen is 13g, and the impact angle is 45°, so as to deform and dent the bowl mouth, and verify the deformation and rebound ability through continuous writing.
[0096] It can be seen from Table 2 that the hardness of the ball seat body of refill B is basically the same as that of refill D, but the pen tip of refill D is a non-spring pen tip. Compared with refill D, refill B has a longer writing length. At the same time, the setting of the bushing 3 reduces the bending risk of the ball seat body 11 and ensures the effectiveness of the spring, thereby ensuring good intermittent writing, ink dripping and bottom leakage capabilities after impact.
[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.
Claims
1. A needle spring pen core, characterized in that: The invention comprises a pen tip, an ink tube assembly and a bushing, wherein the pen tip comprises a ball seat body, a spring and a ball, the ball seat body has a front end and a rear end, the ball is installed at the front end of the ball seat body, the spring is installed inside the ball seat body, and the spring abuts against the ball; the ink tube assembly is connected to the rear end of the ball seat body; the bushing is sleeved on the outside of the ball seat body, and the bushing is fixedly connected to one end of the ink tube assembly close to the ball.
2. The needle tube spring pen core according to claim 1, characterized in that: The distance between the end of the bushing close to the ball and the front end of the ball seat body is no more than 1 / 3 of the axial length of the ball seat body.
3. The needle spring pen core according to claim 1, characterized in that: The material of the ball seat body is stainless steel, and the Vickers hardness of the ball seat body is 180-220HV; the interior of the ball seat body is provided with a flow channel for ink to flow from the rear end to the front end, and the front end of the ball seat body converges inward to form a bowl mouth, and the ball is limited to the bowl mouth; the end face of the bowl mouth is an annular surface, and the radial width of the annular surface is less than 15μm.
4. The needle spring pen core according to claim 1, characterized in that: The bushing includes a first fixed section, a coupling section and a second fixed section, one end of the first fixed section is connected to one end of the coupling section, and the other end of the coupling section is connected to the second fixed section; the first fixed section is sleeved on the outside of the ball seat body, and the second fixed section is sleeved on the outside of the ink tube assembly.
5. The needle spring pen core according to claim 4, characterized in that: The ink tube assembly includes a connecting tube and an ink storage tube, one end of the connecting tube is connected to the ball seat body, and the other end of the connecting tube is connected to the ink storage tube; the second fixing section is sleeved on the outside of the connecting tube.
6. The needle spring pen core according to claim 5, characterized in that: The circumferential outer surface of the connecting pipe is provided with reinforcing ribs, and the reinforcing ribs abut against the inner surface of the second fixing section.
7. The needle spring pen core according to claim 6, characterized in that: The reinforcing rib is an annular protrusion; or, the reinforcing rib includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the connecting pipe.
8. The needle spring pen core according to claim 4, characterized in that: The engaging section is a hollow truncated cone structure, the hollow truncated cone structure has a first end and a second end opposite to each other, the diameter of the first end is smaller than the diameter of the second end, the first end is connected to the first fixing section, and the second end is connected to the second fixing section; Alternatively, the engagement section is an annular plate structure, an inner ring edge of the annular plate structure is connected to the first fixing section, and an outer ring edge of the annular plate structure is connected to the second fixing section.
9. The needle tube spring pen core according to claim 4, characterized in that: The first fixing section, the engaging section and the second fixing section are integrally formed.
10. The needle tube spring pen core according to any one of claims 1 to 9, characterized in that: The bushing is made of metal.
11. The needle spring pen core according to any one of claims 1 to 9, characterized in that: The inner surface of the ball seat body is provided with a limiting portion, one end of the spring abuts against the limiting portion, and the other end of the spring abuts against the ball.
12. A pen, characterized in that: A needle tube spring pen core comprising any one of claims 1 to 11.