Ball-point pen refill with pen point sleeve

Abstract

The ball-point pen refill with the pen point sleeve comprises an ink storage tube, a writing portion and a connecting seat, the writing portion comprises a ball, a ball fixing seat and the pen point sleeve, the front end of the connecting seat comprises an inserting portion, and an ink supply channel of the connecting seat is provided with an opening at the front end of the inserting portion. The front end of the ball fixing seat and the pen point sleeve form limiting fit, the rear end of the ball fixing seat and the front end of the inserting part form abutting fit, the ball fixing seat is connected with the ink supply channel of the connecting seat in an aligned mode, and the inner diameter of an opening in the front end of the inserting part is smaller than the outer diameter of the ball fixing seat. The ball-point pen refill with the pen point sleeve is compact in structure, convenient to assemble, high in structural reliability and good in ink outlet effect.

Description

Technical Field

[0001] The utility model relates to a ballpoint pen core with a pen head cover. Background Art

[0002] A ballpoint pen is a pen that uses a ball at the front end of the pen or the refill to roll out the writing medium. A traditional ballpoint pen includes a refill and a pen case. The refill includes an ink storage tube, a writing part, and a connecting seat connected between the ink storage tube and the writing part. The writing part includes a ball and a ball fixing seat. The ball is rolled and arranged at the front end of the ball fixing seat. The ball fixing seat and the connecting seat are connected. The ball fixing seat and the connecting seat both include an ink supply channel connected to the ink storage tube. When the ballpoint pen is writing on paper, the ball can roll along the paper surface, and at the same time, the ink is brought out from the ink supply channel and adhered to the paper surface, which has better writing quality.

[0003] A Chinese utility model patent application discloses a ballpoint pen refill (CN117227351A), which records a ballpoint pen refill structure including a pen head cover. Compared with the above-mentioned traditional ballpoint pen refill structure, a pen head cover is also sleeved on the outer side of the ball fixing seat, which can realize the ink replenishment function and of course improve the aesthetics of the front end shape of the refill. Figure 1 It can be seen that the front end of the connecting seat extends to form a connecting part, the rear end of the ball fixing seat is inserted and fixed on the inner side of the connecting part, and the rear end of the pen tip cover is sleeved on the outer side of the connecting part. The ink supply channels of the connecting seat and the ball fixing seat are connected, and the ink in the ink storage tube can be delivered through the connecting seat and the ball fixing seat in sequence.

[0004] Due to the low hardness of the plastic material, in order to ensure that the front end of the pen core has sufficient structural strength, the pen tip cover, ball fixing seat, connecting seat and other components have a multi-layer nested structure in the radial direction along the front end of the pen core. However, this results in the front end of the pen core having a larger width, and also makes it impossible to make the inner diameter of the ink supply channel larger. For viscous ink, the ink delivery effect is poor. Utility Model Content

[0005] The utility model provides a ballpoint pen core with a pen head cover, which has the advantages of compact structure, convenient assembly, strong structural reliability and good ink delivery effect.

[0006] The utility model discloses a ballpoint pen core with a pen tip cover, comprising an ink storage tube, a writing part, and a connecting seat connected between the ink storage tube and the writing part. The ink storage tube is used to store ink, and the writing part comprises a ball, a ball fixing seat, and a pen tip cover. The ball is arranged at the front end of the ball fixing seat in a rolling manner and can be rolled when writing, so that the ink in the ink supply channel of the ball fixing seat can be brought out from the gap between the ball and the ball fixing seat to the paper surface. The pen tip cover is arranged on the outside of the ball fixing seat and is connected with the connecting seat in cooperation. The pen tip cover can be used to improve the aesthetics of the front end of the pen core, and can also be used to cooperate to achieve, for example, enhancing the thickness change of handwriting when writing. The ball fixing seat and the connecting seat both comprise an ink supply channel, and the front end of the connecting seat comprises a plug-in connector. The ink supply channel of the connecting seat has an opening at the front end of the plug-in part, and the front and rear ends of the nib cover are respectively provided with a communicating accommodating hole and a connecting hole. The ball fixing seat is inserted in the accommodating hole, and the ball is exposed forward from the front end of the accommodating hole. The connecting hole of the nib cover is sleeved and fixed on the outside of the plug-in part. The front end of the ball fixing seat and the nib cover constitute a limiting fit, which can prevent the ball fixing seat from escaping forward from the front end of the nib cover. The rear end of the ball fixing seat and the front end of the plug-in part constitute an abutment fit, which can play a certain anti-seepage effect. The ink supply channels of the ball fixing seat and the connecting seat are aligningly connected to ensure smooth ink delivery. The inner diameter of the opening at the front end of the plug-in part is smaller than the outer diameter of the ball fixing seat, so that the diameter of the plug-in part becomes smaller.

[0007] Furthermore, the front end of the accommodating hole has a narrowing portion, and the inner and outer sides of the narrowing portion both have conical mating surfaces. The front end of the ball fixing seat has conical surfaces around it, and the mating surface on the outer side of the narrowing portion can be used to improve the writing effect when the pen core is in a tilted state. The mating surface on the inner side of the narrowing portion and the conical surface on the front end of the ball fixing seat form a limited fit, and the narrowing portion can prevent the ball fixing seat from escaping forward from the front end of the pen cover. The fit between the conical surfaces can reduce the requirements for the tolerance and fit accuracy between the components, so that it is not easy to shake between the ball fixing seat and the pen cover.

[0008] Furthermore, the accommodating hole includes a plurality of cylindrical hole segments and conical hole segments, and different cylindrical hole segments have inner diameters of different sizes. These cylindrical hole segments and conical hole segments are distributed along the axial direction of the pen core, and two axially adjacent cylindrical hole segments are connected by the conical hole segment. The diameters of the plurality of cylindrical hole segments from the rear end to the front end of the accommodating hole are gradually reduced. This structural design is more conducive to the insertion of the ball fixing seat into the pen tip cover from the back to the front. During the insertion process, the conical hole segment can play a role in guiding the insertion into the front cylindrical hole segment. The cylindrical hole segment with the relatively smallest inner diameter can be used to achieve interference fit with the plug-in part, which can reduce the shaking of the ball fixing seat.

[0009] Further, the connecting hole includes two cylindrical hole segments with different inner diameters. The two cylindrical hole segments are arranged along the axial direction of the refill. The inner diameter of the cylindrical hole segment at the front position is smaller than that of the cylindrical hole segment at the rear position. The inner diameter of the cylindrical hole segment of the connecting hole at the front position is larger than the inner diameter of the accommodating hole. The inserting portion includes two cylindrical segments that are respectively inserted and matched with the two cylindrical hole segments of the connecting hole. Adopting this stepped inserting and connecting structure can improve the inserting and matching effect between the inserting portion and the connecting hole of the pen tip cover, reduce the requirement for the tolerance matching accuracy between components, and since there are corners in the gap between the inserting portion and the pen tip cover, it can further improve the anti-ink leakage effect.

[0010] Further, a first conical guiding surface is provided at the connection of the two cylindrical hole segments of the connecting hole. A second conical guiding surface is provided at the rear end of the cylindrical hole segment of the connecting hole at the rear position. A third conical guiding surface is provided at the front end of the cylindrical segment of the inserting portion at the front position. A fourth conical guiding surface is provided at the connection of the two cylindrical segments of the inserting portion. The settings of these conical guiding surfaces can all play a guiding role when the inserting portion is inserted into the connecting hole, can reduce the requirement for precision during the assembly process, and make the assembly more convenient.

[0011] Further, an annular rib is provided in abutment between at least one set of corresponding cylindrical hole segments and cylindrical segments for inserting and matching. The annular rib is integrally formed on the inner peripheral wall of the cylindrical hole segment and / or the outer peripheral wall of the cylindrical segment. The setting of the annular rib can also reduce the requirement for the inserting and matching accuracy between the inserting portion and the connecting hole, and in addition, it can further improve the anti-ink leakage effect.

[0012] The beneficial effects of the present utility model are as follows: Compared with the existing refill structure, the ball bead fixing seat and the connecting seat of the refill of the present utility model are indirectly connected by relying on the pen tip cover. There is only an abutting and matching relationship between the ball bead fixing seat and the connecting seat, which can reduce the requirement for the thickness of the inserting portion of the connecting seat. The ink supply channels of the connecting seat and the ball bead fixing seat can be made wider, so the overall structure is simpler, more compact, has strong structural reliability, and has a good ink output effect. Description of the Drawings

[0013] Figure 1 is the exploded view of the structure of the embodiment of the present utility model;

[0014] Figure 2 is the partial cross-sectional view of the embodiment of the present utility model;

[0015] Figure 3 is Figure 2 the partial enlarged view of

[0016] Figure 4Structural diagram of the connection base according to the embodiment of the present utility model;

[0017] Figure 5 Structural diagram of the ball fixing base according to the embodiment of the present utility model;

[0018] Figure 6 Cross-sectional view of the pen tip cover according to the embodiment of the present utility model;

[0019] Figure 7 Partial cross-sectional view of the connection base according to the embodiment of the present utility model. Detailed implementation manner

[0020] An embodiment of the ballpoint pen refill of the present utility model with a pen tip cover is as Figure 1-7 shown: It includes an ink storage tube 1, a writing part, and a connection base 2 connected between the ink storage tube 1 and the writing part. The ink storage tube 1 is used to store ink. The writing part includes a ball 3, a ball fixing base 4, and a pen tip cover 5. The ball 3 is rotatably arranged at the front end of the ball fixing base 4 and can roll during writing, and can bring the ink in the ink supply channel 40 of the ball fixing base 4 out to the paper surface through the gap between the ball 3 and the ball fixing base 4. The pen tip cover 5 is sleeved outside the ball fixing base 4 and is cooperatively connected with the connection base 2. The pen tip cover 5 can be used to improve the aesthetics of the front end of the pen refill and can also be used to cooperate to achieve, for example, enhancing the thickness change of the handwriting during writing. Both the ball fixing base 4 and the connection base 2 include ink supply channels (40, 20). The front end of the connection base 2 includes a plug-in part 21. The ink supply channel 20 of the connection base 2 has an opening 201 at the front end of the plug-in part 21 (as Figure 7 shown). The front and rear ends of the pen tip cover 5 are respectively provided with a communicating accommodation hole 51 and a connection hole 52 (as Figure 6 shown). The ball fixing base 4 is inserted into the accommodation hole 51, and the ball 3 protrudes forward from the front end of the accommodation hole 51. The connection hole 52 of the pen tip cover 5 is sleeved and fixed outside the plug-in part 21. The front end of the ball fixing base 4 and the pen tip cover 5 form a limiting fit to prevent the ball fixing base 4 from protruding forward from the front end of the pen tip cover 5. The rear end of the ball fixing base 4 and the front end of the plug-in part 21 form an abutting fit to achieve a certain anti-seepage effect. The ink supply channels (40, 20) of the ball fixing base 4 and the connection base 2 are connected in alignment to ensure the smooth delivery of ink. The inner diameter of the opening at the front end of the plug-in part 21 is smaller than the outer diameter of the ball fixing base 4, so that the ball fixing base 4 will not be inserted into the ink supply channel 20 of the plug-in part 21, making the diameter of the plug-in part 21 smaller.

[0021] The front end of the accommodation hole 51 has a narrowing portion 53. Both the inner and outer sides of the narrowing portion 53 have tapered mating surfaces. The periphery of the front end of the ball seat 4 has a tapered surface 41. The mating surface on the outer side of the narrowing portion 41 can be used to improve the writing effect when the refill is in an inclined state. The mating surface on the inner side of the narrowing portion 53 and the tapered surface 41 at the front end of the ball seat 4 form a limiting fit. The narrowing portion 53 can prevent the ball seat 4 from being disengaged forward from the front end of the pen tip sleeve 5. Through the fit between the tapered surfaces, the requirement for the tolerance fit accuracy between components can be reduced, making it not easy for the ball seat 4 and the pen tip sleeve 5 to shake.

[0022] The accommodation hole 51 includes two cylindrical hole sections 511 and a tapered hole section 512. The different cylindrical hole sections 511 have different inner diameters respectively. These cylindrical hole sections 511 and the tapered hole section 512 are arranged along the axial direction of the refill. The two adjacent cylindrical hole sections 511 in the axial direction are connected by the tapered hole section 512. The diameters of the two cylindrical hole sections 511 are arranged in a gradually decreasing manner from the rear end to the front end of the accommodation hole 51. This structural design is more conducive to the insertion of the ball seat 4 from the rear to the front into the pen tip sleeve 5. During the insertion process, the tapered hole section 512 can play a role in guiding the insertion into the adjacent cylindrical hole section 511 with a relatively smaller inner diameter. The cylindrical hole section 511 with the relatively smallest inner diameter can be used to achieve an interference fit and positioning fit with the insertion portion 21, which can reduce the shaking of the ball seat 4.

[0023] The connection hole 52 includes two cylindrical hole sections 521 with different inner diameters. The two cylindrical hole sections 521 are arranged along the axial direction of the refill. The inner diameter of the cylindrical hole section 521 at the front position is smaller than that of the cylindrical hole section 521 at the rear position. The inner diameter of the cylindrical hole section 521 of the connection hole at the front position is larger than the inner diameter of the accommodation hole 51. The insertion portion 21 includes two cylindrical sections 211 that are respectively in corresponding plug-in fit with the two cylindrical hole sections 521 of the connection hole. Adopting this stepped plug-in connection structure can improve the plug-in fit effect between the insertion portion 21 and the connection hole 52 of the pen tip sleeve, reduce the requirement for the tolerance fit accuracy between components, and since there are corners in the gap between the insertion portion 21 and the pen tip sleeve 5, the anti-ink leakage effect can be further improved.

[0024] A first conical guiding surface 522 is provided at the connection of the two cylindrical hole sections 521 of the connection hole 52. A second conical guiding surface 523 is provided at the rear end of the cylindrical hole section 521 of the connection hole located at the rear position. A third conical guiding surface 212 is provided at the front end of the cylindrical section 211 of the insertion part 21 located at the front position. A fourth conical guiding surface 213 is provided at the connection of the two cylindrical sections 211 of the insertion part 21. The settings of these conical guiding surfaces can all play a guiding role when the insertion part 21 is inserted into the connection hole 52, can reduce the requirement for precision during the assembly process, and make the assembly more convenient.

[0025] In this embodiment, an annular rib 214 is provided in a butting manner between the cylindrical hole section 521 and the cylindrical section 211 of a group of corresponding insertion and fitting parts located at the rear position. The annular rib 214 is integrally formed on the outer peripheral wall of the cylindrical section 211 located at the rear position. The setting of the annular rib 214 can also reduce the requirement for the insertion and fitting precision between the insertion part 21 and the connection hole 52. In addition, it can further improve the ink anti-seepage effect. In other embodiments, the annular rib 214 can be integrally formed on the inner peripheral wall of the cylindrical hole section 521, can also be provided between the cylindrical hole section 521 and the cylindrical section 211 of a group of corresponding insertion and fitting parts located at the front position, or can be provided on both groups.

[0026] The above embodiments are only one of the preferred specific embodiments of the present invention. The general changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A ballpoint pen refill with a pen tip cover, comprising an ink storage tube, a writing part, and an adapter seat connected between the ink storage tube and the writing part. The writing part includes a ball, a ball fixing seat, and a pen tip cover. The ball is rotatably arranged at the front end of the ball fixing seat. The pen tip cover is sleeved on the outside of the ball fixing seat and is cooperatively connected with the adapter seat. Both the ball fixing seat and the adapter seat include an ink supply channel. The front end of the adapter seat includes a plug-in part, and the ink supply channel of the adapter seat has an opening at the front end of the plug-in part. The front and rear ends of the pen tip cover are respectively provided with a communicating accommodation hole and a connection hole. The ball fixing seat is inserted into the accommodation hole, and the ball protrudes forward from the front end of the accommodation hole. The connection hole of the pen tip cover is sleeved and fixed on the outside of the plug-in part. It is characterized in that: The front end of the ball bead fixing seat and the pen tip sleeve form a limiting fit, the rear end of the ball bead fixing seat and the front end of the insertion part form an abutting fit, the ink supply channels of the ball bead fixing seat and the connection seat are connected in alignment, and the inner diameter of the opening at the front end of the insertion part is smaller than the outer diameter of the ball bead fixing seat.

2. The ballpoint pen refill with a pen tip cover according to claim 1, characterized in that: The front end of the accommodation hole has a narrowing part, and both the inner and outer sides of the narrowing part have tapered mating surfaces. The periphery of the front end of the ball bead fixing seat has a tapered surface, and the mating surface on the inner side of the narrowing part and the tapered surface at the front end of the ball bead fixing seat form a limiting fit.

3. The ballpoint pen refill with a pen tip cover according to claim 2, characterized in that: The accommodation hole includes several cylindrical hole segments and tapered hole segments. Different cylindrical hole segments have different inner diameters respectively, and these cylindrical hole segments and tapered hole segments are arranged along the axial direction of the pen core. The two adjacent cylindrical hole segments in the axial direction are connected by a tapered hole segment, and the diameters of several cylindrical hole segments arranged in the direction from the rear end to the front end of the accommodation hole are arranged in a gradually decreasing manner.

4. The ballpoint pen refill with a pen tip cover according to claim 1, characterized in that: The connection hole includes two cylindrical hole segments with different inner diameters, and the two cylindrical hole segments are arranged along the axial direction of the pen core. The inner diameter of the cylindrical hole segment at the front position is smaller than the inner diameter of the cylindrical hole segment at the rear position. The inner diameter of the cylindrical hole segment of the connection hole at the front position is larger than the inner diameter of the accommodation hole. The insertion part includes two cylindrical segments respectively corresponding to and inserted into the two cylindrical hole segments of the connection hole.

5. The ballpoint pen refill with a pen tip cover according to claim 4, characterized in that: A first tapered guiding surface is provided at the connection of the two cylindrical hole segments of the connection hole. A second tapered guiding surface is provided at the rear end of the cylindrical hole segment of the connection hole at the rear position. A third tapered guiding surface is provided at the front end of the cylindrical segment of the insertion part at the front position, and a fourth tapered guiding surface is provided at the connection of the two cylindrical segments of the insertion part.

6. The ballpoint pen refill with a pen tip cover according to claim 4, characterized in that: An annular rib is abutted and arranged between at least one group of corresponding cylindrical hole segments and cylindrical segments in an inserted and mated manner, and the annular rib is integrally formed on the inner peripheral wall of the cylindrical hole segment and / or the outer peripheral wall of the cylindrical segment.

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