TW201742760A - Ballpoint pen chip and writing utensil equipped with the ballpoint pen chip - Google Patents

Abstract

A ballpoint pen chip that brings a front half part side of a transfer ball into contact with an inward annular protrusion on a front end side in a chip body from a backward side of the inward annular protrusion and receives a rear half part side of the transfer ball with a front end part of a receiving member. The receiving member includes, on a front end side thereof, a reduction part gradually reduced in a cross-sectional area forward. A front-most end part of the reduction part is disposed backward from the transfer ball. A portion of the receiving member further on a rear side than the reduction part is unretreatably fixed to the chip body and configured to elastically contract when a pressing force is received from the transfer ball.

Description

Atomic pen head and writing instrument with the atomic pen head

The present invention relates to a ballpoint pen that changes the width of a writing line and a writing instrument provided with the ballpoint pen.

In the writing instrument, for example, as described in Patent Document 1, there is provided a member that adjusts the relative position of the rod-shaped extending members that support the balls from the rear side. According to the writing instrument, if the relative position of the rod-like extending member is changed by adjusting the amount of screwing of the pen tip or the rod-like extending member, the amount of rotation of the movement control member, or the like, the inner edge of the small opening of the ball and the tip The gap between the two changes, so the amount of ink discharged also changes, and as a result, the width of the writing line also changes.

Further, as another conventional technique, there is a technique of changing the line width by adjusting the inclination angle of the tip with respect to the surface to be written (see Patent Document 2).

[First technical literature]

[Patent Literature]

Patent Document 1: Japanese Patent Publication No. 2004-1246

Patent Document 2: Japanese Patent Publication No. 2013-252654

However, in the prior art of Patent Document 1, in order to change the width of the writing line, it is necessary to adjust the relative position of the aforementioned rod-shaped extending member, and it takes time to adjust the operation. Further, in the prior art of Patent Document 2, there is a case where the writing posture is changed in order to change the inclination angle of the writing instrument.

In view of such a problem, the present invention has the following structure.

A atomic pen head having: a substantially cylindrical pen body that penetrates the inside in a front-rear direction; a transfer ball that is received on a front end side of the pen body and protrudes from a front end side of the outer peripheral surface toward the front; and a configuration a support member on a rear side of the transfer ball in the body of the pen head, wherein the atomic pen head supports the rear half side of the transfer ball by a front end portion of the support member, and the feature of the atom pen head is The receiving member is configured to have a reduced portion whose front end side is gradually narrowed in cross section, and the foremost end portion of the reduced portion is disposed behind the transfer ball and is rearward of the reduced portion The portion is fixed to the tip body in a manner that cannot be retracted, and is elastically contracted when subjected to a pressing force from the transfer ball, and the inner wall of the pen tip body is provided close to or in contact with a side wall of the narrowing portion to suppress the narrowing portion. The curved bend inhibits the protrusion.

Since the present invention is constructed as described above, the writing line width can be easily changed.

1, 2, 3, 4, 5‧‧‧ atomic pen heads

10, 10'‧‧‧ pen head

11‧‧‧ball room

11a‧‧‧Cylindrical inner circumference

11a1‧‧‧Inward annular protrusion

11b‧‧‧Corner cylindrical inner wall

12‧‧‧Contraction

15‧‧‧Bending suppression protrusion

15a‧‧‧ front face

15b‧‧‧Ink tank

15c‧‧‧ rear end face

15d‧‧‧bump

20‧‧‧Transfer beads

30, 50, 60‧‧‧Support components

31, 51a, 61a‧‧

32, 52b, 62a‧‧‧ support protrusion

51, 61‧‧‧ front side members

52, 62‧‧‧ rear side members

100‧‧‧ writing utensils (ball pen)

120‧‧‧Annual pen refill

S1, s2‧‧ ‧ gap

S3‧‧‧Ink storage space

Fig. 1 is a longitudinal sectional view showing a first embodiment of a ballpoint pen according to the present invention.

Fig. 2 shows an example of a receiving member. Fig. 2(a) is a front view, Fig. 2(b) is a half cross-sectional view, and Fig. 2(c) is a rear view.

Fig. 3 is a cross-sectional view taken along line (III)-(III) of Fig. 1.

Fig. 4 is a longitudinal sectional view showing the main part of the tip body in a state in which the front end portion is not riveted.

Fig. 5 is a view of the tip body in a state in which the front end portion is not swaged as seen from the front side.

Fig. 6 is a perspective view showing a longitudinal section of a main part of the tip body in a state in which the distal end portion is not swaged.

Fig. 7 is a longitudinal sectional view showing a writing instrument equipped with a ballpoint pen according to the present invention.

Fig. 8 is a cross-sectional view showing the main part of a use state of a writing instrument equipped with a ballpoint pen according to the present invention.

Fig. 9 is a longitudinal sectional view showing a second embodiment of the atomic probe of the present invention.

Fig. 10 is a longitudinal sectional view showing a third embodiment of the atomic probe of the present invention.

In Fig. 11, Fig. 11(a) is a cross-sectional view taken along line (a)-(a) of Fig. 10, and Fig. 11(b) is taken along line (b)-(b) of Fig. 10. Sectional view.

Fig. 12 is a cross-sectional view taken along line (c)-(c) of Fig. 10.

Fig. 13 is a perspective view showing a front side member of the receiving member of the third embodiment.

Fig. 14 is a perspective view showing a rear side member of the receiving member of the third embodiment.

Fig. 15 is a longitudinal sectional view showing a fourth embodiment of the atomic pen tip of the present invention.

Fig. 16 is a cross-sectional view taken along line (XV) - (XV) of Fig. 15.

Fig. 17 is a perspective view showing the receiving member of the fourth embodiment.

Figure 18 is a longitudinal sectional view showing a fifth embodiment of the atomic pen tip of the present invention.

Fig. 19 is an enlarged view of the fifth embodiment in which the transfer ball is omitted and viewed from the front.

Fig. 20 is an enlarged view of a main part of a fifth embodiment.

Fig. 21 is a cross-sectional view taken along line (XXI)-(XXI) of Fig. 20, wherein Fig. 21(a) shows a normal state, and Fig. 21(b) shows that the projection support is bent toward the radial direction by bending. Reduce the state of the section.

According to a first aspect of the present invention, a ballpoint pen includes a substantially cylindrical tip body that penetrates the inside in a front-rear direction, is received at a distal end side of the pen body, and has a distal end side of the outer peripheral surface facing forward from the tip body a protruding transfer ball; and a receiving member disposed on a rear side of the transfer ball in the body of the pen, wherein the atomic pen head supports the second half of the transfer ball by a front end portion of the receiving member In the side of the support member, the receiving member has a narrowing portion whose front end side is gradually narrowed toward the front end side, and the foremost end portion of the reduced portion is disposed behind the transfer ball and further rearward than the reduced portion The side portion is fixed to the aforementioned tip body in such a manner that it cannot be retracted, and is elastically contracted when subjected to a pressing force from the aforementioned transfer ball.

According to the above configuration, the front end side of the receiving member is prevented from being bent in the radial direction by the narrowing portion, and the writing line having a thickness corresponding to the pressing force can be stably obtained.

Further, the aforementioned "reduction portion" does not include a coil spring.

In the second feature, in order to more effectively suppress the front end side of the receiving member from being bent in the radial direction, the reduced portion is formed in a solid shape in which the cross-sectional area continuously increases from the foremost end portion of the receiving member toward the rear.

Here, the aforementioned "solid shape" means a shape in which the inside does not have a hollow portion.

Further, specific examples of the narrowing portion include a truncated cone shape, a truncated cone shape, and the like.

In a third aspect, in order to ensure the ink flow path sufficiently in the body of the pen tip and to improve the manufacturability, the support member has a plurality of orientation paths at intervals in the circumferential direction on the rear side of the reduction portion. The support protrusions protruded in the outer direction, and the support protrusions are crimped to the inner wall surface of the pen head body and fixed in such a manner that they cannot be retracted.

As a fourth feature, the aforementioned receiving member is integrally formed of a synthetic resin material to obtain a soft writing feeling. (Refer to Figures 1 and 9).

As a fifth feature, in order to effectively elastically deform the above-described receiving member and to improve productivity, the above-described receiving member is constituted by two members including a front side member having the above-described reduced portion and a rear side member having the above-described supporting protrusion. (Refer to Figure 10 and Figure 15).

As a sixth feature, in order to improve quality and productivity, the aforementioned rear side member is formed of a material having higher wear resistance than the front side member.

As a seventh feature, in order to elastically deform the support member more effectively, the line width is easily adjusted, and the front side member is formed of a material that is more elastically deformable than the rear side member.

In the eighth aspect, in order to elastically deform the support member more effectively, and to improve productivity, the front side member is disposed in the state in which the front side member is loosely fitted to the inner peripheral surface of the tip body, and is disposed on the transfer ball and the foregoing Between side members.

According to a ninth feature, in the front side member, a plurality of longitudinal ribs extending in the front-rear direction are provided at intervals in the circumferential direction at an outer peripheral portion of the front side member in the rear side in order to reduce the flow resistance of the ink in the writing head body. And set the number of these longitudinal ribs and the number of the aforementioned support protrusions The amount is different (refer to Figure 12).

According to a tenth feature, the front side member and the rear side member are coupled and integrated as a preferred embodiment in which the productivity is good (see FIG. 15).

In the eleventh feature, in order to prevent the narrowed portion from being bent in the outer diameter direction, the inner wall of the tip body is provided with a bending suppression protrusion that is close to or in contact with the side wall of the reduced portion to suppress bending of the reduced portion (see 18th) Figure ~ Figure 21).

According to a twelfth aspect, in order to stabilize the ink flow rate, the plurality of bending suppression projections are provided at a plurality of intervals in the circumferential direction, and the ink guiding grooves that communicate with each other in the circumferential direction are connected to each other in the front-rear direction (see the 19th aspect). Figure and Figure 20).

According to a thirteenth aspect, in order to make the flow rate of the ink more stable, a contraction portion of the transfer ball when the front end surface is retracted by the front end surface is provided on the distal end side of the tip body, and the bending suppression protrusion is disposed in the contraction portion The front end face is on the rear side.

According to a fourteenth aspect, the contraction portion is configured such that the transfer ball that protrudes protrudes forward from the front end of the tip body. (Refer to Figure 20)

According to a fifteenth aspect, in particular, in order to effectively prevent ink leakage, a coil spring is disposed in a ring shape around the narrowing portion, and a tip end portion of the coil spring abuts against the transfer ball and is supported in a manner that cannot be retracted The rear end portion of the coil spring (refer to Fig. 9).

According to a sixteenth aspect, in order to sufficiently ensure the ink flow path in the body of the pen and to improve the quality and productivity, a rectangular tubular inner wall surface is formed on the distal end side of the pen body, and the inner wall surface of the rectangular cylinder is formed. The outer peripheral surface of the transfer ball approaches or contacts (see Fig. 3).

A seventeenth feature is that the writing instrument is configured by the above-described atomic pen head (refer to Figure 7).

Next, specific embodiments having the above features will be described in detail based on the drawings.

In addition, in the present specification, "front" indicates the front end direction of the atomic pen head, and "rear" indicates the opposite direction. Further, the "outer diameter direction" means a direction in which the central portion is opened in the radial direction of the atomic pen tip, and the "in-diameter direction" indicates the opposite direction.

<First embodiment>

Fig. 1 shows a ballpoint pen 1 of the present invention.

The stylus head 1 includes a substantially cylindrical tip body 10 that penetrates the inside in the front-rear direction, a distal end side that is accommodated in the tip body 10, and a transfer ball that protrudes forward from the front end of the tip body 10 toward the front end side of the tip body 10 20 and a receiving member 30 disposed on the rear side of the transfer ball 20 in the pen head body 10.

The atomic pen head 1 abuts the front half side of the transfer ball 20 from the rear side thereof to the inward annular projection 11a1 on the distal end side in the pen body 10, and is not supported by the inner surface of the pen body 10 in the initial state. The rear end portion of the transfer ball 20 is supported by the front end portion of the substantially rod-shaped receiving member 30.

Further, the atomic probe head 1 has an inner wall surface on the distal end side of the tip body 10 in a rectangular tubular shape, and the outer circumferential surface of the transfer ball 20 is brought into close contact with or in contact with the rectangular cylindrical inner wall surface 11b.

The tip body 10 is formed of, for example, an alloy such as stainless steel, brass, or zinc white copper or a synthetic resin in a substantially cylindrical shape having a tapered conical portion on the distal end side.

In the tip body 10, a ball chamber 11, a constricted portion 12, a front narrow hole 13, and a large diameter hole 14 are provided in this order from the distal end portion side, and their internal spaces communicate in the front-rear direction.

The ball-shaped chamber 11 is configured to rotatably receive the transfer ball by the inner circumferential annular projection 11a1 that is biased toward the foremost end, the rectangular tubular inner wall surface 11b that extends rearward from the inner annular projection 11a1, and the distal end surface of the constricted portion 12. 20 spaces.

After the transfer ball 20 is inserted into the ball chamber 11, the front end portion of the pen tip body 10 is riveted from the outside, thereby forming the inward annular projection 11a1.

That is, as shown in Fig. 4, a cylindrical inner peripheral surface 11a is formed at the most distal end of the ball chamber 11 at a stage before the transfer ball 20 is inserted. After the transfer ball 20 is inserted into the ball chamber 11, the peripheral wall of the cylindrical inner peripheral surface 11a is swaged from the outside, and an inward annular projection 11a1 is formed on the distal end side of the cylindrical inner peripheral surface 11a. The inward annular projection 11a1 is in contact with the front half of the transfer ball 20 so as to protrude in the in-diameter direction from the cylindrical inner peripheral surface 11a.

The rectangular tubular inner wall surface 11b has an inner wall surface of a regular polygonal tubular shape (a regular nine-sided cylindrical shape according to the illustrated example). Each surface constituting the rectangular tubular inner wall surface 11b is formed in a flat surface shape. Further, among the plurality of faces constituting the rectangular tubular inner wall surface 11b, inner corner portions 11c are formed between the circumferentially adjacent faces.

Further, the constricted portion 12 has an inner diameter that is smaller than the minimum diameter of the angular cylindrical inner wall surface 11b, and is formed to be substantially contracted (or toward the inner diameter). The portion of the annular projection that protrudes in the direction (see Figs. 1 and 4). The inner circumferential surface of the hole penetrating the constricted portion 12 is a substantially cylindrical surface, and the ink guiding groove 12a penetrating in the front-rear direction is formed in the surface (see FIG. 5). The ink guiding groove 12a is set such that the flow amount of the ink is appropriately ensured.

The constricted portion 12 of the above-described configuration is set to have an inner diameter smaller than the outer diameter of the transfer ball 20 so as not to be inserted into the transfer ball 20 toward the rear.

In addition, as another example other than the example of the figure, the contraction part 12 may be omitted, and the rectangular cylindrical inner wall surface 11b may be connected to the front end side of the front narrow hole 13.

A front narrow hole 13 is provided on the rear side of the constricted portion 12.

The front narrow hole 13 is a substantially truncated-cone-shaped hole that is continuously reduced in diameter toward the front, and houses the reduced portion 31 of the receiving member 30 to be described later, and the space around the reduced portion 31 serves as an ink flow path. A large diameter hole 14 is continuously formed on the rear end side of the front narrow hole 13.

The large diameter hole 14 is formed in a substantially cylindrical shape continuous from the rear end of the front narrow hole 13 toward the rear. The receiving member 30 is inserted into the large diameter hole 14 , and a plurality of support protrusions 32 on the rear side of the receiving member 30 are press-fitted to the inner wall surface of the large diameter hole 14 .

The large diameter hole 14 is formed by a plurality of drills which are gradually reduced in diameter, and is formed into a hole which is gradually reduced in diameter toward the front side, and is processed into a hole of the same diameter which is continuous in the front-rear direction by finishing processing such as reamer machining. Further, as another example other than the example of the drawing, a hole in which the large diameter hole 14 is gradually reduced in diameter toward the front may be omitted.

In addition, the transfer ball 20 is formed of a hard metal material such as a sintered body mainly composed of tungsten carbide or tantalum carbide or the like, or a synthetic resin material, and is housed in the ball chamber 11 .

The front half side of the transfer ball 20 is pressed against the inward annular projection 11a1 on the distal end side of the ball chamber 11. Further, the rear half side of the transfer ball 20 is not supported by the front end surface of the constricted portion 12 which is the inner surface of the tip body 10, but is supported only by the front end surface of the receiving member 30. That is, a gap is secured between the front end surface of the constricted portion 12 and the rear half side of the transfer ball 20 (see FIG. 1), and the front end surface of the receiving member 30 abuts against the rear end surface of the transfer ball 20. .

In addition, in the case of writing with a normal pen pressure, the transfer ball 20 is maintained without being written. The inner surface of the main body 10 is supported by the front end portion of the substantially rod-shaped receiving member 30 (see FIG. 8). However, since the writing pressure is too strong, the strong pressing toward the rear is received. In the case of pressure, there is also a case where the constricted portion 12 of the inner surface of the tip body 10 is in contact with each other.

The outer diameter of the transfer ball 20 is set to be smaller than the outer diameter of the virtual spherical body that is in contact with the cylindrical inner wall surface 11b of the ball chamber 11. Therefore, the outer peripheral surface of the transfer ball 20 is close to each surface constituting the corner cylindrical inner wall surface 11b (see FIG. 3).

Further, there is a case where the transfer ball 20 is slightly eccentric with respect to the center of the tip body 10 due to variations in dimensional accuracy of the inner surface of the ball chamber 11, and the like, in this case, the outer peripheral surface of the transfer ball 20 It is in contact with the surface constituting the corner cylindrical inner wall surface 11b.

Further, as shown in Fig. 3, an inner horn portion 11c is formed between adjacent flat faces of the corner cylindrical inner wall surface 11b around the transfer ball 20. The inner horn portion 11c secures the gap s1 which becomes the ink flow path.

Further, the receiving member 30 has a narrowing portion 31 whose front end portion is gradually narrowed toward the front end side, and the leading end portion of the reducing portion 31 is disposed behind the transfer ball 20. Further, the receiving member 30 has a plurality of (three in accordance with the example) supporting protrusions 32 protruding in the outer diameter direction at intervals on the rear side of the reducing portion 31 by the circumferential direction, by which the supporting protrusions are provided 32 is crimped to the inner wall surface of the pen head body 10 and fixed in such a manner that it cannot advance and retreat.

The support member 30 is integrally formed of a hard synthetic resin material which is elastically deformable, such as POM (polyoxymethylene), PE (polyethylene), and PP (polypropylene), in a rod shape, and is pressed by the transfer ball 20 Pressure and elastic contraction.

The reduction portion 31 is formed in a truncated cone shape in which the outer diameter continuously increases from the contact surface with the transfer ball 20 toward the rear.

As shown in Fig. 2, the support projections 32 project in a substantially radial shape and are provided in plurality (three according to the illustrated example). These plurality of support projections 32 are crimped to the inner circumferential surface of the tip body 10 when the receiving member 30 is inserted into the tip body 10 from the rear side of the tip body 10 at the manufacturing stage of the atom pen tip 1.

In Fig. 2, reference numeral 32a is a tapered surface for facilitating the above-described insertion work, and each tapered surface 32a is formed on the distal end side of each of the support projections 32.

Further, a space between the support protrusions 32 and 32 adjacent in the circumferential direction functions as an ink circulation flow path.

Next, the writing instrument 100 using the atomic pen tip 1 of the above configuration will be described (see Fig. 7).

The writing instrument 100 is such that the atomic pen tip 1 at the tip end of the ball pen refill 120 protrudes from the front end of the bobbin 110 by the pressing operation of the ejector portion 140, and the protruding state is released by the operation of bending the clip 111 toward the center side of the bobbin. Telescopic ball pen.

The ball pen refill 120 connects the ball tip 1 to the front end of the ink containing tube 121, and fills the inside with ink.

Next, the effect of the writing of the atomic pen head 1 and the writing instrument 100 (ball pen) based on the above configuration will be described.

As shown in Fig. 8, when the front end side of the transfer ball 20 is pressed against the writing surface or the like and the pressing force is applied to the transfer ball 20, the receiving member 30 is elastically contracted toward the axial direction, and is transferred. The ball 20 is slightly receded. Therefore, a gap is formed between the transfer ball 20 and the inward annular projection 11a1, and ink is discharged from the gap. Further, when the pressing force is reduced, the receiving member 30 is restored to its original length, and the transfer ball 20 is advanced and the gap is narrowed.

Therefore, when the pressing force is relatively large, the amount of contraction of the receiving member 30 and the amount of retraction of the transfer ball 20 become large, and the gap between the transfer ball 20 and the inward annular projection 11a1 is widened, so that the ink is large. The amount of spit increased and the writing line became thicker.

Further, when the pressing force is relatively small, the amount of contraction of the receiving member 30 and the amount of retraction of the transfer ball 20 become small, and the gap between the transfer ball 20 and the inward annular projection 11a1 is narrowed, so that the ink is ink. The amount of spitting is reduced and the writing line is thinner.

When writing is performed in a normal writing posture, depending on the writing angle at the time of writing, the front end side of the receiving member 30 may be subjected to the tilting direction with respect to the direction of the center line of the receiving member 30. Pressure (refer to Figure 8).

According to the atomic probe head 1 of the present embodiment, the narrowing portion 31 which is gradually narrowed toward the front cross-sectional area on the front end side of the receiving member 30, so that the receiving member 30 is received even under the pressing force in the direction of the above-described inclination The front end side is also less likely to bend toward the radial direction and elastically contract toward the axial direction.

In other words, in the case where the front end side of the receiving member 30 is formed into a straight rod shape, the front end side portion is bent toward the radial direction and is displaced from the center of the transfer ball 20, thereby making it possible to transfer the ball. The amount of retreat of 20 becomes unstable, and the amount of ink discharged and the thickness of the writing line become unstable. However, according to the present invention, it is possible to stably obtain a thick writing line corresponding to the pressing force.

Further, since the gap s1 is secured by the inner corner portion 11c of the corner cylindrical inner wall surface 11b around the transfer ball 20, the gap s1 serves as an ink flow path to stably maintain the ink flow rate.

Further, since the outer circumferential surface of the transfer ball 20 is in point contact with the flat surface constituting the rectangular tubular inner wall surface 11b, for example, the outer circumferential surface of the transfer ball is brought into contact with the cylindrical surface. When the technique is compared, the rotation resistance of the transfer ball 20 can be made small.

Next, another example of the atomic probe head of the present invention will be described.

In addition, since the atomic pen head shown below is a ballpoint pen that partially changes the atomic pen tip 1, the modified portion will be mainly described in detail, and the detailed description thereof will be omitted.

<Second embodiment>

The atomic probe head 2 shown in Fig. 9 has a structure in which a coil spring 40 is added to the atomic pen tip 1.

As will be described in detail, the atomic pen tip 2 is disposed in a ring shape around the reduced portion 31 of the receiving member 30, and the tip end portion of the coil spring 40 abuts on the transfer ball 20 by The stepped portion on the rear end side of the reduced portion 31 supports the rear end portion of the coil spring 40 so as not to be retracted, and a gap s2 is secured between the rear end of the transfer ball 20 and the front end of the reduced portion 31.

According to the atomic pen tip 2 of the above configuration, the transfer ball 20 is crimped to the inward annular projection 11a1 by the elastic force of the coil spring 40 in an unused state in which the pressing force toward the rear is not applied to the transfer ball 20. Thereby, it is possible to effectively prevent the ink from leaking from between the transfer ball 20 and the inward annular projection 11a1.

Further, when the transfer ball 20 is pressed against the surface to be written, since the transfer ball 20 is slightly retreated, a gap is formed between the transfer ball 20 and the inward annular projection 11a1, and ink is discharged from the gap.

Further, in the case where the pressing force on the transfer ball 20 is relatively large, since the rear end surface of the transfer ball 20 abuts against the front end surface of the receiving member 30 and the receiving member 30 elastically contracts, the transfer ball 20 is thus transferred. The gap with the inward annular projection 11a1 becomes large, and the ink flow rate based on the gap increases, and the writing line becomes thick. Further, in the case where the transfer ball 20 is formed of a synthetic resin material, not only the support member 30 is contracted, but also the transfer ball 20 is easily shrunk, so that the ink flow rate can be further increased.

In this way, the atomic pen head 2 can also be used as a component of the writing instrument 100 (ball pen) in the same manner as the above-described ballpoint pen 1, and can stably obtain a writing line having a thickness corresponding to the pressing force at the time of writing.

The atomic pen head 2 can be used as a component of the writing instrument 100 (ball pen) in the same manner as the above-described ballpoint pen 1.

<Third embodiment>

The stylus head 3 shown in Fig. 10 is a stylus head in which the above-described stylus head 1 replaces the susceptor 30 with the susceptor 50.

The receiving member 50 abuts the two members of the front side member 51 having the reduced portion 51a and the rear side member 52 having the support protrusion 52b in the front-rear direction.

The front side member 51 has a truncated cone-shaped reduced portion 51a having substantially the same shape as the above-described reduced portion 31 on the distal end side thereof, and the foremost end portion of the reduced portion 51a is brought into contact with the rear end of the transfer ball 20.

Further, the front side member 51 is provided with a plurality of (three in accordance with the illustrated example) vertical ribs 51b extending in the front-rear direction at equal intervals in the circumferential direction at the outer peripheral portion of the axial portion on the rear side of the reduced portion 51a. .

The vertical rib 51b is formed on the rear side of the reduced portion 51a of the front side member 51 in a state of being loosely fitted to the inner peripheral surface of the tip body 10, and is formed to be continuous in the front-rear direction. A tapered surface 51b1 that is inclined toward the axis side is formed on the distal end side of the vertical rib 51b.

Further, in FIGS. 10 to 12, a gap is illustrated between the longitudinal rib 51b and the inner circumferential surface of the tip body 10, but actually, the longitudinal rib 51b is in contact with or close to the inner circumferential surface of the tip body 10. And formed by loose fitting. According to this configuration, it is possible to insert not only the inside of the pen body 10 but also The work of the side member 51 is easy, and the axial elastic stretchability of the entire front side member 51 can be improved.

The vertical rib 51b functions as a reinforcing rib that suppresses the bending of the front side member 51 by a pen pressure or the like.

Further, the tapered surface 51b1 functions as a guide surface when the receiving member 50 is inserted into the pen tip body 10.

A cylindrical jig insertion hole 51c that opens to the rear is provided on the rear end side of the center portion in the front side member 51.

Further, as shown in Fig. 14, the rear side member 52 has a plurality of (four in accordance with the illustrated example) protruding outward in the outer circumferential direction of the cylindrical shaft portion 52a at equal intervals in the circumferential direction. Protrusion 52b. The rear side member 52 supports the rear end surface of the front side member 51, and presses the plurality of support protrusions 52b against the inner wall surface of the pen head body 10 in the front-rear direction, thereby being fixed in such a manner that it cannot advance and retreat.

The number of the support protrusions 52b of the rear side member 52 is set to be larger than the number of the longitudinal ribs 51b of the front side member 51. (Refer to Figure 12).

The front side member 51 of the above structure is formed of a material that is more elastically deformable than the rear side member 52. Also, the rear side member 52 is formed of a material having higher wear resistance than the front side member 51.

In a preferred example of the embodiment, the front side member 51 is formed of PE (polyethylene resin), and the rear side member 52 is formed of POM (polyacetal resin).

As the PE, a polyethylene resin having an elastic modulus (elasticity) of 4 to 17 [10^3 kg/cm^2], a friction coefficient of 0.3 to 0.5, and a hardness of HDD of 45 to 75 can be used.

The POM can use a spring constant of 24 to 31 [10^3 kg/cm^2] and a friction coefficient of about 0.18. A polyacetal resin having a hardness of about HRR118.

Next, in the stylus head 3 shown in FIG. 10, the steps of assembling the transfer ball 20 and the receiving member 50 in the stylus main body 10 will be described in detail.

First, the transfer ball 20 is inserted into the tip body 10 from the front, and the front end side of the peripheral wall of the ball chamber 11 is swaged to form the inward annular projection 11a1.

Next, the front side member 51 is inserted into the tip body 10 from the rear, and the front end surface of the front side member 51 (specifically, the reduced portion 51a) abuts against the rear end portion of the transfer ball 20.

In the work of inserting the front side member 51 into the tip body 10, as an example, a rod-shaped jig (not shown) is inserted into the jig insertion hole 51c of the front side member 51. The aforementioned jig is pulled out after the aforementioned insertion work. As another example, the front side member 51 may be inserted into the tip body 10 without using the jig insertion hole 51c and the jig.

Next, the rear side member 52 is pressed into the tip body 10 from the rear. The pressed rear side member 52 abuts the front end portion to the rear end portion of the front side member 51. Therefore, the front side member 51 is in a state in which the transfer ball 20 and the rear side member 52 are sandwiched from the front-rear direction.

The pressing force at the time of press-fitting is appropriately set so that the transfer ball 20 is pressed by the receiving member 50 to be pressed against the inward annular projection 11a1, thereby preventing ink leakage, and the transfer ball 20 can be smoothly rotated. And write easily with a moderate and appropriate pen pressure.

In the same manner as the above-described ballpoint pen 1, the atomic pen tip 3 of the above configuration can be used as a component of the writing instrument 100 (ball pen), and can stably obtain a writing thickness corresponding to the pressing force at the time of writing. line.

Moreover, the rear side member 52 is formed of a material having higher wear resistance than the front side member 51, so that when pressed into the pen tip body 10, the support protrusion 52b of the rear side member 52 is not easily cut, and can be prevented Foreign matter such as chips is left in the tip body 10, and the fitting force of the receiving member 50 and the tip body 10 is stabilized without being lowered, and the workability at the time of press-fitting can be improved.

Further, since the front side member 51 is formed of a material that is more elastically deformable than the rear side member 52, the portion of the front side member 51, particularly the reduced portion 51a, can be effectively contracted by the writing pressure, and the line width based on the pen pressure adjustment can be made. Adjustments are easy.

Further, in the stylus head 3, the resistance of the ink flow path is reduced by making the number of the longitudinal ribs 51b of the receiving member 50 different from the number of the support protrusions 52b of the rear side member 52.

That is, the front side member 51 has a possibility of rotation in an assembly work or the like, but if the longitudinal rib 51b is set to be the same number as the support protrusion 52b, if the rear end portion of the vertical rib 51b is located adjacent to each of the support protrusions In the front between 52b and 52b, the ink flowing forward is subjected to a large resistance from the rear end faces of the respective longitudinal ribs 51b.

However, according to the atomic pen tip 3 of the present embodiment, as shown in Fig. 12, the portion between the adjacent vertical ribs 51b and 51b and the adjacent support protrusions 52b and 52b can easily ensure the portion communicating in the axial direction. Reduce ink flow resistance.

<Fourth embodiment>

The stylus head 4 shown in Fig. 15 is a stylus head in which the above-described stylus head 1 replaces the susceptor member 30 with the susceptor member 60.

The receiving member 60 is integrally formed of two members of a front side member 61 having a reduced portion 61a and a rear side member 62 having a supporting protrusion 62a.

The front side member 61 is formed only by the reduced portion 61a having substantially the same shape as the reduced portion 31 (see FIG. 1) of the atom pen tip 1 described above.

The rear side member 62 is formed in substantially the same shape as a portion on the rear side of the reduced portion 31 in the above-described atomic pen tip 1, and has a plurality of (three in accordance with the illustrated example) equally spaced apart in the circumferential direction. Protrusion 62a.

The front side member 61 is made of the same material (PE) as the front side member 51 of the atomic pen head 3, and the rear side member 62 is made of the same material (POM) as the rear side member 52 of the atomic pen head 3.

That is, the front side member 61 is formed of a material that is more elastically deformable than the rear side member 62, and the rear side member 62 is formed of a material having higher wear resistance than the front side member 61.

The front side member 61 and the rear side member 62 are integrally joined by two-color molding (double molding) to constitute the receiving member 60.

Further, as another example, a concave portion may be provided at a distal end portion of the rear side member 62, and the front side member 61 may be fitted or screwed to the concave portion.

Further, in Fig. 15, reference numeral 62a1 is a tapered surface which facilitates the insertion work of the tip body 10. Further, the symbol 62c is a jig insertion hole for inserting a jig, and can be used as needed.

When the manufacturing process of the atomic pen head 4 is described, the transfer ball 20 is inserted into the distal end side of the pen body 10, and the distal end side of the pen tip body 10 is swaged, and then the receiving member 60 is pressed into the pen body from the rear side. 10. This work is performed by inserting a rod-shaped jig (not shown) into the jig insertion hole 62c on the rear end side of the receiving member 60.

The pressing force at the time of press-fitting is appropriately set so that the transfer ball 20 is pressed by the receiving member 60 to be pressed against the inward annular projection 11a1, thereby preventing ink leakage, and the transfer ball 20 can be smoothly rotated. And write easily with a moderate and appropriate pen pressure.

Thereby, in the atomic pen head 4 of the above structure, also with the above-described atomic pen head 1 Similarly, it can be used as a component of the writing instrument 100 (ball pen), and it is possible to stably obtain a thick writing line corresponding to the pressing force at the time of writing.

Further, the rear side member 62 is formed of a material having higher wear resistance than the front side member 61, and therefore, when pressed into the tip body 10, the support protrusion 62a of the rear side member 62 is less likely to be cut, and it is possible to prevent chips from remaining in the tip body 10, and the like. Foreign matter, and the workability at the time of press-fitting can be improved.

Further, since the front side member 61 (the reduced portion 61a) is formed of a material that is more elastically deformable than the rear side member 62, the front side member 61 (the reduced portion 61a) can be effectively contracted by the writing pressure, and the pen pressure adjustment can be performed. Line width adjustment becomes easy.

<Fifth Embodiment>

The stylus head 5 shown in Fig. 18 is a stylus head in which the stylus head 4 (refer to Fig. 15) is replaced with the stylus body 10' as the tip body 10'.

The pen tip main body 10' is a pen head main body in which the bending suppressing projection 15 and the ink guiding groove 15b are provided to the tip body 10 described above, and the position of the constricted portion 12 before the biasing portion is changed.

In the ball chamber 11 on the distal end side of the pen tip main body 10', the constricted portion 12 whose diameter is reduced so that the transfer ball 20 is retracted by the distal end surface 12b is provided in the ball-shaped chamber 11 (see the 20)).

The tip main body 10' has a bending suppression protrusion 15 that suppresses bending of the reduced portion 61a in the radial direction on the inner wall on the rear side of the distal end surface 12b of the constricted portion 12.

The distal end surface 12b of the constricted portion 12 is a substantially meandering surface that is inclined toward the rear as it approaches the central portion.

The contraction portion 12 is set such that the transfer ball 20 protrudes from the front end of the tip body 10' toward the front in a state where the ball 20 is transferred while the transfer ball 20 is being retracted.

The size P is set such that the front end side outer peripheral surface of the transfer ball 20 is in contact with the written surface and is written at a normal writing angle (60 to 90 degrees), the tip end of the tip body 10' The edge is not easily rubbed against the surface to be written, so that the friction between the writing surface and the front end edge of the tip body 10' is reduced to perform smooth writing.

The bending suppression protrusions 15 are provided at a predetermined interval in the circumferential direction around the reduced portion 61a. The portion between the bending suppression protrusions 15 adjacent in the circumferential direction becomes the ink guiding groove 15b which is continuous in the front-rear direction.

Each of the bending suppression protrusions 15 has a stepped shape with respect to the inner diameter of the constricted portion 12.

Regarding the position of the front end surface 15a of the bending suppression protrusion 15, as shown by the double-dotted chain line in Fig. 20, the transfer ball 20 is retracted by the pressing force from the front and abuts against the front end surface of the constricted portion 12. In the case of 12b (in detail, a corner portion), the ink storage space s3 is appropriately set so as to ensure the ink storage space s3 between the rear side portion of the retracted transfer ball 20 and the front end surface 15a of the bending suppression protrusion 15.

Further, as shown in Fig. 20, each of the bending suppression projections 15 has a front end surface 15a which is inclined rearward toward the center portion, and a rear end surface 15c which is inclined toward the front as it approaches the center portion, and protrudes in the in-diameter direction. The projecting end surface 15d is close to or in contact with the outer peripheral surface of the reduced portion 61a.

The projecting end face 15d is set to be close to the outer peripheral surface of the reduced portion 61a, and is sized to be close to each other. However, the size of the receiving member 60 varies depending on the inclination of the support member 60, and the like.

Further, the ink guide groove 15b is provided on the inner peripheral side of the bending suppression projection 15 and the contraction portion 12 at a predetermined interval in the circumferential direction. Each ink guiding groove 15b suppresses the bending The manner of the 15 and the constricted portion 12 is continuous in the forward and backward directions. In each of the ink guiding grooves 15b, the bottom portion (the inner surface in the outer diameter direction) is located on the outer side of the outer diameter of the constricted portion 12 (see Fig. 19).

In the ink guide groove 15b, the ink toward the rear side of the bending suppression protrusion 15 flows toward the front side of the bending suppression protrusion 15 and the contraction portion 12.

Thereby, according to the atomic pen head 5, as shown in Figs. 20 to 21, the transfer ball 20 is separated from the contraction portion 12 toward the front in the initial state, and the rear end portion of the transfer ball 20 and the narrowing portion 61a are separated. The front end is close to or in contact.

In this state, a relatively strong pressing force toward the rear is applied to the transfer ball 20, and when the pressing portion 61a is bent in the radial direction by the pressing force, the outer peripheral surface of the reduced portion 61a is bent to suppress the inner peripheral surface of the projection 15. Support, so that its bending is suppressed.

Therefore, the reduced portion 61a is hardly bent in the radial direction and is elastically contracted toward the rear. Therefore, it is possible to prevent the ink from flying or the line width from becoming unstable in writing in a specific direction due to the aforementioned bending.

In other words, by the above-described bending, it is possible to prevent the unevenness of the gap between the protruding end surface 15d and the reducing portion 61a and the ink flow rate from becoming unstable, and it is possible to eliminate the trouble caused by such a phenomenon.

Further, according to a preferred example of the present embodiment, the ink-inducing grooves 15b are provided in the bending suppression projections 15 and the constricted portions 12, and the ink storage space s3 is secured on the front side from the front end surface 15a, so that the ink can be stably secured. In particular, when a large pen pressure is applied and the transfer ball 20 is retracted largely, the ink flow path and the storage space are not lost, and a thick line corresponding to the writing pressure can be written.

Further, as shown by the double-dot chain line in Fig. 20, in the case where the amount of retraction of the transfer bead 20 is relatively large due to a strong pressing force, the transfer bead 20 is also by the constricted portion 12 The front end side of the transfer ball 20 in the retracted state is located forward of the front end of the pen tip main body 10'. Therefore, it is possible to prevent the front end edge of the pen tip main body 10' from rubbing with the writing surface and the like, and it is impossible to write.

<Other Modifications>

Further, in the above-described embodiment, the positional relationship between the ink guiding groove 12a (see FIG. 5) of the constricted portion 12 and the inner angular portion 11c of the rectangular tubular inner wall surface 11b is not particularly limited, but the flow resistance of the ink is further reduced. Alternatively, a plurality of ink guiding grooves 12a may be disposed to correspond to the inner horn portion 11c.

Further, in the stylus head 2 shown in Fig. 9, a gap s2 is provided between the tip end of the receiving member 30 and the rear end of the transfer ball 20. However, as another example, the gap s2 may be omitted and the gap s2 may be omitted. The front end of the receiving member 30 abuts against the rear end of the transfer ball 20.

Further, in the illustrated example, a corner cylindrical inner wall surface 11b (see FIG. 3) is provided in the ball chamber 11 as a particularly preferable embodiment. However, as another example, a rectangular inner wall surface may be used instead. In the other example, the support member 30 (50 or 60) is stretched and contracted by the pressing force from the front side, and the inner wall surface of the shape other than the shape of the cylindrical inner wall surface is provided. The transfer ball 20 advances and retracts, so that a writing line of a line width corresponding to the pressing force can be obtained.

In addition, according to the example of the figure, the atomic pen head 1 (2, 3, or 4) which can adjust the line width by the receiving member 30 or the like is provided, and the corner cylindrical inner wall surface 11b is provided in the ball chamber 11 (refer to Fig. 3), but the corner cylindrical inner wall surface 11b can replace the coil spring having the rebound transfer ball 20 instead of the atomic pen head and the receiving member 30 (50 or 60) not having the receiving member 30 (50 or 60). The atomic pen head or the like is applied to the inner wall surface of the ball chamber, and in the case of such a case, the stable ink flow rate can be ensured by the gap s1 inside the inner corner portion 11c in the corner cylindrical inner wall surface 11b.

Further, according to the above-described atomic pen tip 1 (2, 3 or 4), the support member 30 (50 or 60) is formed of a hard synthetic resin material which is elastically deformable, but as another example, it may be made of metal. The material (specifically, stainless steel, brass, etc.) forms part or all of the support member 30 (50 or 60). In the case of such a case, it is preferable to form the transfer ball 20 from a synthetic resin material which can be elastically deformed.

Further, a monochrome pen atom is configured as an example of the writing instrument 100 including the atom pen tip 1 according to the example of the drawing. However, as another example of the writing instrument 100, a plurality of ball pen refills having a plurality of colors may be formed. Color writing utensils, multi-function writing utensils with a variety of refills such as a ball pen refill and a pencil refill. Further, it is a matter of course that the writing instrument 100 can be configured similarly for the atomic pen heads 2, 3 or 4.

Further, in the above-described atomic pen head 3 (see FIG. 10), the front side member 51 and the rear side member 52 are brought into contact with each other. However, as another example, the front side may be fitted or screwed. The member 51 and the rear side member 52 are integrated, and the front side member 51 and the rear side member 52 are integrated by double molding.

Further, in the atomic pen head 4 (see FIG. 15), the front side member 61 and the rear side member 62 are integrally coupled, but as another example, a recessed portion may be provided at the front end of the rear side member 62, and the recessed portion may be provided in the recessed portion. The manner in which the front side member 61 is fitted in a manner of advancing and retracting.

Further, according to the illustrated example, the coil spring 40 is provided only in the atomic pen head 2, but the coil spring 40 may be provided to the atomic pen head 3 and the atom pen tip 4 in substantially the same configuration.

Further, in the atomic pen heads 1 and 4 (see FIGS. 1 and 15), the receiving member 30 (or 60) is fitted to the pen tip body 10 so as not to be able to advance and retreat, but as another example, it may be set as The manner in which the receiving member 30 (or 60) is engaged with the pen tip body 10 so as not to be retracted and capable of advancing. In this case, the movement of the receiving member 30 (or 60) toward the front is restricted by abutting against the transfer ball 20.

Further, in the stylus head 5 (the 18th to 21st drawings), the bending suppression protrusion 15 is not sized in contact with the side wall of the reduction portion 61a, but may be set to be curved as another example. The suppression protrusion 15 is dimensioned so as to be in contact with the side wall of the reduction portion 61a, and the contraction portion 61a and the bending suppression protrusion 15 are rubbed and contracted by the pressing force toward the rear.

In addition, the atomic pen head 5 (Fig. 18 to Fig. 21) has a configuration in which the bending suppression protrusion 15 is added to the atomic pen head 4 (see Fig. 15). However, as another example, the atomic pen head 1 (first) may be used. Fig.), the atomic pen head 2 (Fig. 9) or the atomic pen head 3 (Fig. 10) is added with a bending suppression protrusion 15.

The present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit and scope of the invention.

5‧‧‧Atom pen

10’‧‧‧ pen head

11‧‧‧ball room

11a1‧‧‧Inward annular protrusion

11b‧‧‧Corner cylindrical inner wall

12(12b)‧‧‧ front end face of the constriction

15‧‧‧Bending suppression protrusion

15a‧‧‧ front face

15b‧‧‧Ink tank

15c‧‧‧ rear end face

15d‧‧‧bump

20‧‧‧Transfer beads

60‧‧‧Support components

61a‧‧‧Reduction

61‧‧‧ front side members

62‧‧‧ Back side components

S3‧‧‧Ink storage space

P‧‧‧ size

(XXI)-(XXI)‧‧‧ line

Claims (11)

A atomic pen head having: a substantially cylindrical pen body that penetrates the inside in a front-rear direction; a transfer ball that is received on a front end side of the pen body and protrudes from a front end side of the outer peripheral surface toward the front; and a configuration a support member on a rear side of the transfer ball in the body of the pen head, wherein the atomic pen head supports the rear half side of the transfer ball by a front end portion of the support member, and the feature of the atom pen head is The receiving member is configured to have a reduced portion whose front end side is gradually narrowed in cross section, and the foremost end portion of the reduced portion is disposed behind the transfer ball and is rearward of the reduced portion The portion is fixed to the tip body in a manner that cannot be retracted, and is elastically contracted when subjected to a pressing force from the transfer ball, and the inner wall of the pen tip body is provided close to or in contact with a side wall of the narrowing portion to suppress the narrowing portion. The curved bend inhibits the protrusion. The atomic pen tip according to the first aspect of the invention, wherein the bending suppression projections are provided at a plurality of intervals in the circumferential direction, and the ink guiding grooves that are adjacent to each other in the circumferential direction are connected to each other in the front-rear direction. The atomic pen tip according to claim 1, wherein a contraction portion of the transfer ball when the front end surface is retracted is provided on a distal end side of the pen tip body, and the bending suppression protrusion is disposed at a contraction ratio The front end of the part is on the rear side. The atomic pen tip according to the third aspect of the invention, wherein the contraction portion is configured such that the transfer ball to be supported protrudes forward from a front end of the tip body. The atomic pen head according to item 1 of the patent application, wherein The support member has a plurality of support protrusions protruding outward in the out-of-diameter direction at intervals on the rear side of the reduced portion, and the support protrusions are crimped to the inner wall surface of the pen body and cannot be retracted. The support member is composed of two members, a front member having the reduced portion and a rear member having the support projection. The stylus tip according to claim 5, wherein the front side member is formed of a material having higher wear resistance than the front side member. The stylus tip according to claim 5, wherein the front side member is formed of a material that is more elastically deformable than the aforementioned rear side member. The atomic pen tip according to claim 5, wherein the front side member is disposed between the transfer ball and the rear side member in a state of being loosely fitted to an inner circumferential surface of the tip body. The atomic pen tip according to claim 5, wherein the front side member is provided with a plurality of longitudinal ribs extending in the front-rear direction at intervals in the circumferential direction at an outer peripheral portion on the rear side of the reduced portion. The number of longitudinal ribs is different from the number of the aforementioned support protrusions. The atomic pen tip according to claim 5, wherein the front side member is coupled to the front side member and integrated. A writing instrument comprising the atomic pen tip of any one of claims 1 to 10.