JP6621622B2 - Writing instrument - Google Patents

Description

  The present invention relates to a shaft tube, a pen tip support portion provided on the front side of the shaft tube and having a pen tip and an ink communication hole reaching the pen tip, and a rear side of the pen tip support portion in the shaft tube. The present invention relates to a writing instrument including an ink inhaler provided and a collar extending rearward in the axial direction from the rear end portion of the pen tip support portion in the shaft cylinder.

  FIG. 14 is a schematic longitudinal sectional view of a conventional ink inhaler 200 used in a fountain pen or the like. As shown in FIG. 14, a conventional ink inhaler 200 includes a cylindrical ink tank 210 that defines an ink containing portion 211c that contains ink forward in the axial direction, and the ink containing portion on the inner peripheral surface of the ink containing portion 211c. A piston 220 having a flange portion 222 that is slidable and liquid-tightly fitted in the axial direction of the portion 211c, and a rod 221 that extends from the flange portion 222 toward the rear in the axial direction of the ink tank 210; A knob 230 rotatably connected to the ink tank 210 at the rear of the 210 in the axial direction. A male screw portion 223 s is formed on at least a part of the side surface of the rod 221 of the piston 220, and at least a front region of the knob 230 has a hollow cylindrical shape having a female screw portion 230 s, and the male screw portion of the rod 221. 223s and the female screw portion 230s of the knob 230 are screwed together.

  At the rear side of the ink tank 210 in the axial direction, one side of a cylindrical cover 250 having a larger diameter than the outer periphery of the ink tank 210 is bonded and fixed. The other side of the cover 250 has a larger diameter than the outer periphery of the knob 230 in the axial direction, and a throttle portion is provided at the other end of the cover 250 and is provided on the outer periphery of the knob 230. The knob 230 is supported so as to be rotatable with respect to the cover 250 while restricting the rearward movement of the flange in the axial direction.

  Generally, screwing (screwing) between a male screw portion and a female screw portion can be used together for bonding and fixing one side of the cylindrical cover 250 to the rear side in the axial direction of the ink tank 210. Usually, the ink tank 210 is made of transparent resin, the knob 230 and the piston 220 are made of colored resin, and the cover 250 is made of metal.

  The ink inhaler 200 as described above is disclosed in Japanese Patent No. 4596675 (Patent Document 1), Japanese Patent No. 5388360 (Patent Document 2), Japanese Patent Application Laid-Open No. 2013-43285 (Patent Document 3), and the like. .

  In order to cause the ink inhaler 200 to inhale ink as described above, first, a casing such as a fountain pen is removed and the knob 230 of the ink inhaler 200 is exposed. Then, if necessary, the knob 230 is rotated in one direction (direction A in FIG. 14) to position the piston 220 at the forefront in the axial direction of the ink containing portion 211c. Next, a pen tip such as a fountain pen is immersed in the ink in the ink container, and in this state, the knob 230 is rotated in the opposite direction (direction B in FIG. 14). Along with this, the piston 220 in the ink containing portion 211c moves rearward in the axial direction of the ink containing portion 211c. As a result, a negative pressure is generated in the ink containing portion 211c, and ink is sucked into the ink tank 210 from the ink container through the pen tip.

  Fountain pens and the like having such an ink inhaler are often stored with the pen tip facing upward when writing is not being performed. Then, when trying to write on the paper, the posture is changed to a state where the pen tip is directed downward (writing state). Along with this change in posture, the ink that has been positioned rearward in the axial direction in the ink containing portion moves forward in the axial direction and is supplied to the pen tip. It is desirable that this movement be performed promptly along with a change in the posture of the fountain pen, etc., but even if the posture is changed to a state where the pen tip is directed downward, the ink is kept in the ink container due to the surface tension of the ink. In some cases, it was left behind in the axial direction. In this case, since ink is not supplied to the pen tip, smooth writing cannot be continued.

  In order to cope with such a problem, Japanese Patent No. 5744777 (Patent Document 4) proposes a fountain pen in which a movable body (movable piece member) that can move back and forth in the axial direction is arranged in an ink containing portion. FIG. 15 is a schematic longitudinal sectional view of the front of the fountain pen 301 described in Patent Document 4 in the axial direction. As shown in FIG. 15, the movable body (moving piece member 312) has a surface of ink when the stylus 321 of the fountain pen 301 is changed in posture from a state in which it is directed upward to a state in which it is directed downward. A collar (protrusion 320b) extending from the rear end of the pen core 320 to the rear in the axial direction by overcoming the tension and moving from the rear to the front in the axial direction in the ink container (ink container 306). ). At this time, since the ink in the ink container 306 also moves together with the moving body (moving piece member 312), as a result, the ink quickly moves from the rear in the axial direction to the front in the axial direction, and travels along the protrusion 320b. And smoothly supplied to the pen tip 321.

Japanese Patent No. 4596675 Japanese Patent No. 5388360 JP 2013-43285 A Japanese Patent No. 5744777

  Since the moving body (moving piece member 312) employed in Patent Document 4 has a cylindrical shape and is manufactured by cutting, the manufacturing cost is high.

  The present invention was devised in view of the above problems, and when the posture of the pen tip is changed from the state of being directed upward to the state of being directed downward, the axial direction in the ink containing portion is determined. It is an object of the present invention to provide a writing instrument that can quickly move the ink located at the rear to the front in the axial direction and reliably guide the ink to the collar portion, and can be manufactured at a lower cost than in the past.

  The present invention provides a shaft tube, a pen tip support portion provided on the front side of the shaft tube and having a pen tip and an ink communication hole reaching the pen tip, and the pen tip support portion in the shaft tube. An ink inhaler provided on the rear side; and a collar portion extending axially rearward from a rear end portion of the pen tip support portion in the shaft cylinder, wherein the ink inhaler contains ink. A cylindrical ink tank that defines the ink storage portion to be axially forward, a flange portion that is slidable and liquid-tightly fitted in the axial direction of the ink storage portion on the inner peripheral surface of the ink storage portion, and A piston having a rod extending from the flange portion toward the axially rear side of the ink tank; and fixed to the inside of the ink containing portion at an axially front side of the flange portion of the piston; Penetrated A receiving member having a window portion, and an inner portion of the ink containing portion, disposed between the flange portion of the piston and the receiving member, and having a size that cannot pass through the window portion, and the window portion. A writing instrument comprising: at least one moving body having a size capable of coming into contact with the penetrating through-hole.

  According to the present invention, the moving member is more reliably prevented from falling by the receiving member, and the hook member extending axially rearward from the rear end portion of the pen tip supporting portion is provided on the receiving member. The movable body that has moved to the axially front receiving member (or to the vicinity of the receiving member) and the collar part more reliably contact each other, and as a result, the ink is more reliably guided to the collar part. be able to. This increases the degree of freedom of the shape that can be adopted as a moving body, that is, it does not have to be a conventional cylindrical shape, and can be manufactured at a low cost such as a sphere or a polyhedron (such as a cube or tetrahedron). A moving body having a shape can be employed.

  Preferably, the collar portion has a truncated sector shape. In this case, it is preferable that the window portion of the receiving member also has a shape corresponding to the cross-sectional shape of the flange portion. In this case, the degree of freedom of the shape of the moving body is further increased.

  Preferably, the receiving member has a disc portion that is smaller in diameter than the inner diameter of the ink containing portion, is concentric with the central axis of the ink containing portion and is arranged perpendicular to the central axis, and the disc portion. And a support member fixed to the inner peripheral surface of the ink containing portion.

  In this case, in the gap between the peripheral edge portion of the disk portion and the inner peripheral surface of the ink containing portion, a region where no support member is present can be used as the window portion. In such a shape of the receiving member, since the moving body received by the receiving member is effectively guided to the opening (so as to protrude), the moving body and the collar portion are more reliably brought into contact with each other. Can be guided to the buttocks more reliably.

  More preferably, the support member has a shape such that the disk portion is positioned forward in the axial direction with respect to the fixed portion of the support member with respect to the inner peripheral surface of the ink containing portion. Specifically, for example, the support member includes a pair of first support portions that extend inward in the radial direction of the ink storage portion from positions facing each other on the inner peripheral surface of the ink storage portion, and the pair of first support members. And a pair of second support portions that extend forward in the axial direction of the ink containing portion from the radially inner end portion of the one support portion, and the disk portion is the pair of second support portions. It is fixed to the front end.

  In this case, it is easy to avoid interference between the support member and the collar when attaching the ink inhaler to the pen tip support.

  In the above invention, the shape of the moving body is a sphere. In this case, since the moving body has a simple shape, the manufacturing cost of the moving body, and hence the writing instrument, can be reduced.

  The at least one moving body is at least two spheres. In this case, since the two spheres together function as a moving body, the diameter of each one sphere required to overcome the surface tension of the ink can be reduced. As a result, a sufficient space is secured between each one sphere and the inner peripheral surface of the ink containing portion, and the posture is changed from a state in which the pen tip is directed upward to a state in which it is directed downward. In addition, the air existing in the pen tip support portion can rise smoothly into the ink containing portion without being blocked by the sphere. That is, the replacement of the air and ink existing in the pen tip support portion can be performed smoothly.

  More preferably, the at least one moving body is four spheres. In this case, the diameter of each one sphere required to overcome the surface tension of the ink can be further reduced. As a result, a wider space is secured between the ball and the inner peripheral surface of the ink containing portion, and when the posture is changed from a state in which the pen tip is directed upward to a state in which the pen tip is directed downward, The air existing in the first support portion can rise more smoothly into the ink containing portion without being blocked by the sphere. That is, the replacement of the air and the ink existing in the pen tip support portion can be performed more smoothly.

  According to the present invention, the moving member is more reliably prevented from falling by the receiving member, and the hook member extending axially rearward from the rear end portion of the pen tip supporting portion is provided on the receiving member. The movable body that has moved to the axially front receiving member (or to the vicinity of the receiving member) and the collar part more reliably contact each other, and as a result, the ink is more reliably guided to the collar part. be able to. This increases the degree of freedom of the shape that can be adopted as a moving body, that is, it does not have to be a conventional cylindrical shape, and can be manufactured at a low cost such as a sphere or a polyhedron (such as a cube or tetrahedron). A moving body having a shape can be employed.

It is a schematic longitudinal cross-sectional view of the writing instrument of one embodiment of this invention. It is a schematic longitudinal cross-sectional view of the ink inhaler used for the writing instrument of FIG. FIG. 3 is a schematic longitudinal sectional view of the ink inhaler of FIG. 2 in a state where the pen tip is directed upward. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the schematic of the receiving member of the ink inhaler of FIG. FIG. 5A is a schematic perspective view of the receiving member, and FIG. 5B is a schematic vertical sectional view of the receiving member of FIG. 5A viewed from the right front direction. FIG. 5C is a view of the receiving member of FIG. 5A as viewed from above, and is partially shown in a sectional view. It is a schematic longitudinal cross-sectional view of the ink inhaler of FIG. 2 in a writing state. FIG. 3 is a schematic diagram showing a state in which two spheres are closely fitted between the receiving member of the ink inhaler of FIG. 2 and the inner peripheral surface of the ink containing portion. FIG. 7 (A) shows a state in which two spheres fit snugly between the side portions of the pair of first support portions and the inner peripheral surface of the ink containing portion, and FIG. A state is shown in which two spheres fit snugly between the side portions of the pair of first support portions, the front end portion of the annular portion, and the inner peripheral surface of the ink containing portion. It is the schematic of the ink tank of the ink inhaler of FIG. 8A is a schematic longitudinal sectional view of the ink tank, FIG. 8B is a schematic front view of the ink tank viewed from the right direction of FIG. 8A, and FIG. FIG. 9 is a cross-sectional view taken along the line CC of FIG. It is the schematic of the piston of the ink inhaler of FIG. 9A is a schematic side view of the piston, FIG. 9B is a cross-sectional view taken along line BB in FIG. 9A, and FIG. 9C is a cross-sectional view of FIG. It is CC sectional view taken on the line. It is a schematic longitudinal cross-sectional view of the knob of the ink inhaler of FIG. It is a schematic front view of the piston guide of the ink inhaler of FIG. It is a schematic longitudinal cross-sectional view of the cover of the ink inhaler of FIG. It is a figure for demonstrating an example of the assembly method of the ink inhaler of FIG. 13A is a diagram showing a process of applying grease to the ink tank, FIG. 13B is a diagram showing a process of inserting a piston into the ink tank, and FIG. FIG. 13D is a diagram showing a step of screwing the knob onto the rod of the piston, and FIG. 13E is a diagram showing the step of engaging the knob with the ink tank. FIG. 13F is a diagram showing a process of fitting a cover on the rear side in the axial direction of the ink tank, and FIG. 13G is a process of arranging four spheres in the ink containing portion. FIG. 13H is a diagram illustrating a process of inserting the receiving member into the ink containing portion. It is a schematic longitudinal cross-sectional view of the conventional ink inhaler. It is a schematic longitudinal cross-sectional view of the front of the axial direction in the state which is writing of the fountain pen described in patent document 4.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal sectional view of a writing instrument (specifically, a fountain pen 1) according to an embodiment of the present invention, and FIG. 2 is a schematic view of an ink inhaler 100 used in the fountain pen 1 of FIG. FIG. 3 is a schematic longitudinal sectional view of the ink inhaler 100 of FIG. 2 in a state where the pen tip 4 is directed upward, and FIG. 4 is a sectional view taken along the line AA of FIG. is there.

  As shown in FIG. 1, a fountain pen 1 according to an embodiment of the present invention includes a shaft tube 2, a pen tip 4 provided on the front side of the shaft tube 2, and an ink communication hole 5 reaching the pen tip 4. In the shaft cylinder 2, the ink inhaler 100 provided on the rear side of the pen tip support section 3 in the shaft cylinder 2 and the axial direction from the rear end portion of the pen tip support section 3 in the shaft cylinder 2. And a flange 6 extending rearward and having a truncated sector shape. In addition, the pen tip support portion 3 of the present embodiment has an air communication hole that extends along the axial direction from an opening provided in the vicinity of the pen tip 4 to the inside of the ink containing portion 11c and allows air to pass therethrough. 8 is further provided.

  As shown in FIG. 1, in the present embodiment, the ink inhaler 100 is configured such that the front end region is press-fitted into the groove 7 provided in the rear region of the pen tip support unit 3, thereby the pen tip support unit 3. Removably attached to. Further, the pen tip support portion is formed by screwing the male screw portion provided on the outer peripheral surface of the pen tip support portion 3 in the axial direction and the female screw portion provided on the inner peripheral surface of the shaft tube in the axial direction front. The shaft tube 2 is fixed to the shaft 3.

  As shown in FIGS. 1 to 3, the ink inhaler 100 of the present embodiment includes a cylindrical ink tank 10 that defines an ink storage portion 11c that stores ink forward in the axial direction, and an ink storage portion 11c. A flange portion 22 that is slidable in a liquid-tight manner in the axial direction of the ink containing portion 11c on the inner peripheral surface of the ink tank, and a rod 21 that extends from the flange portion 22 toward the rear in the axial direction of the ink tank 10; And a knob 30 connected to the inside of the ink tank 10 so as to be rotatable with respect to the ink tank 10 at the rear side in the axial direction of the ink tank 10 and at a front side in the axial direction from the flange portion 22 of the piston 20. , A receiving member 70 having a window portion 71 fixed inside the ink containing portion 100 and penetrated by the collar portion 6, and inside the ink containing portion 11c. In addition, it is arranged between the flange portion 22 of the piston 20 and the receiving member 70, and has a size that cannot pass through the window portion 71 and that can contact the flange portion 6 that penetrates the window portion 71. And four spheres 60.

  The four spheres 60 of the present embodiment are all true spheres made of stainless steel (SUS304) having a diameter of 2 mm, and the total weight is 0.12 g. All of the four balls 60 can freely move between the flange portion 22 of the piston 20 and the receiving member 70.

  As shown in FIGS. 3 and 4, the four balls 60 of the present embodiment are formed in front of the flange portion 22 of the piston 20 in the axial direction in a state where the pen tip 4 of the fountain pen 1 is directed upward. It can be arranged in the saucer-like space without a gap.

  Next, FIG. 5 is a schematic view of the receiving member 70 of the ink inhaler 100 of FIG. 5A is a schematic perspective view of the receiving member 70, and FIG. 5B is a schematic longitudinal sectional view of the receiving member 70 of FIG. 5A viewed from the right front direction. 5 (C) is a view of the receiving member 70 of FIG. 5 (A) as viewed from above, and is partially shown in a sectional view.

  As shown in FIG. 5A to FIG. 5C, the receiving member 70 of the present embodiment includes an annular portion 72 and a front end portion of the annular portion 72 (the lower left end portion in FIG. 5 (B) and the left end in FIG. 5 (C), a pair of first support portions 73a and 73b extending radially inward from each other, and the diameters of the pair of first support portions 73a and 73b. A pair of second support portions 74a and 74b extending forward in parallel with the axis of the ink containing portion 11c from the inner end portion in the direction. A disk portion 75 is fixed to the front end portions of the pair of second support portions 74a and 74b. In addition, a projection 76 that makes one round of the annular portion 72 is formed on the outer peripheral surface of the annular portion 72. When the receiving member 70 is fitted into the ink containing portion 11c, the protrusion 76 bites into the inner peripheral surface of the ink containing portion 11c and fixes the receiving member 70 to the inner peripheral surface. Yes.

  The receiving member 70 of the present embodiment is made of stainless steel (SUS303). The annular portion 72 has an inner diameter of 4.9 mm, an outer diameter of 5.47 mm, and an axial length of 1.6 mm. The protrusion 76 has a distance from the rear end of the annular portion 72 (the upper right end in FIG. 5A, the right end in FIGS. 5B and 5C) from 0.8 mm to 1.mm. It is provided in an area of 0.3 mm up to 1 mm. The maximum outer diameter of the protrusion 76 is 5.59 mm.

  As shown in FIG. 5C, each of the pair of first support portions 73a and 73b of the receiving member 70 has a width of 1 mm, and the axis line (one point in FIG. 5C) extends from the front end portion of the annular portion 72. It extends perpendicular to the chain line. Each of the first support portions 73a and 73b has a shape corresponding to a part of an arc having a diameter of 2.3 mm concentric with the axial line at the radially inner end. Further, each of the pair of second support portions 74a and 74b of the receiving member 70 has a width corresponding to a part of a cylinder having an inner diameter of 2.3 mm and an outer diameter of 2.9 mm concentric with the axis. Have.

  The disk portion 75 has a thickness of 0.6 mm and a rear end diameter of 2.9 mm. As shown in FIGS. 5A to 5C, the disk portion 75 of the present embodiment is formed so as to be gradually tapered toward the front, and the diameter of the front end portion is 2.4 mm. is there. Further, as shown in FIGS. 5B and 5C, a mortar-shaped concave portion having a depth of 0.3 mm is formed on the axially rear surface of the disk portion 75.

  With the above configuration, as shown in FIG. 5B, the receiving member 70 of the present embodiment has a separation distance d1 between the front end portion of the annular portion 72 and the rear end portion of the disk portion 75 of 2 mm. The radial distance d2 between the inner peripheral surface of the annular portion 72 and the outer edge portion of the rear end portion of the disk portion 75 is 1 mm.

  Returning to FIG. 1, in the present embodiment, in the state where the receiving member 70 as described above is fitted in the ink containing portion 11c, the peripheral portion of the disk portion 75 of the receiving member 70 and the inner periphery of the ink containing portion 11c. An annular window 71 having a width of 1.285 mm is formed between the surface and the surface. As shown in FIG. 1, the window portion 71 is penetrated by the flange portion 6.

  Next, FIG. 6 is a schematic longitudinal sectional view of the ink inhaler 100 of FIG. 2 in a writing state. As shown in FIG. 6, in the writing state, the four spheres 60 move to the vicinity of the window portion 71 formed between the disk portion 75 of the receiving member 70 and the inner peripheral surface of the ink tank 10. Yes. As described above, each of the four spheres 60 of the present embodiment has a diameter of 2 mm. Since the diameter is equal to the separation distance d1 between the front end portion of the annular portion 72 of the receiving member 70 and the rear end portion of the disc portion 75, the receiving member 70 is interposed between the annular portion 72 and the disc portion 75. The sphere 60 moved in the vicinity can enter. Furthermore, the collar part 6 which has penetrated the window part 71 has a cross-sectional shape of a truncated sector having a central angle of approximately 180 °. For this reason, as shown in FIG. 6, at least one of the four balls 60 moved to the vicinity of the receiving member 70 (near the window portion 71) is surely brought into contact with the flange portion 6. As a result, the ink moved to the front in the axial direction together with the four balls 60 is surely supplied to the pen tip 4 through the collar portion 6.

  Here, the width of each of the pair of first support portions 73a and 73b and the pair of second support portions 74a and 74b of the receiving member 70, the diameter of the four balls 60, and the receiving member 70 are fitted. When the dimensions of the inner diameter of the ink containing portion 11c at the position satisfy a specific relationship, the side portions of the pair of first support portions 73a and 73b and / or the pair of second support portions 74a and 74b of the receiving member 70 And the inner sphere of the ink containing portion 11c are fitted into the two spheres 60, and even if the posture of the fountain pen 1 is changed from the writing state to the state where the pen tip 4 is directed upward, A situation may occur in which the two balls 60 do not move rearward in the axial direction.

  FIG. 7 is a schematic view showing a state in which the two balls 60 are fitted tightly between the receiving member 70 of the ink inhaler 100 of FIG. 2 and the inner peripheral surface of the ink containing portion 11c. FIG. 7A shows a state in which two spheres 60 are closely fitted between the side portions of the pair of first support portions 73a and 73b and the inner peripheral surface of the ink containing portion 11c. 7 (B) is a state in which two balls 60 are fitted between the side portions of the pair of first support portions 73a and 73b, the front end portion of the annular portion 72, and the inner peripheral surface of the ink containing portion 11c. Is shown.

これをｗについて解くと、以下の式が得られる。

For example, as shown in FIG. 7A, two spheres 60 are tightly fitted between the side portions of the pair of first support portions 73a and 73b of the receiving member 70 and the inner peripheral surface of the ink containing portion 11c. In the case of fitting, the position of the axis is O, the center of one sphere 60 is O ′, and the contact point of the two spheres 60 is H in a cross section in a plane perpendicular to the axis of the ink containing portion 11 c through the center of the sphere 60. The width of the pair of first support portions 73a and 73b and the pair of second support portions 74a and 74b of the receiving member 70 is 2w, the diameter of each ball 60 is 2r, and the receiving member 70 is in a position where it is fitted. Assuming that the inner diameter of the ink containing portion 11c is 2R, the triangle OO′H has a length of each side of OO ′ = R−r, OH = r + w, O′H = r, and ∠OHO ′ = 90 °. It is a right triangle. That is, the following relationship is established among R, r, and w by the three-square theorem.

Solving this for w yields:

That is, by adopting values of R, r, and w that do not satisfy the above relationship, the side portions of the pair of first support portions 73a, 73b of the receiving member 70 and the inner peripheral surface of the ink containing portion 11c It is possible to avoid a situation in which the two balls 60 fit into each other.

  However, even if the above formula is not satisfied, depending on the length of the pair of second support portions 74a and 74b of the receiving member 70 and the inner diameter of the annular portion 72 of the receiving member 70, FIG. ) Between the side portions of the pair of first support portions 73a and 73b and the pair of second support portions 74a and 74b of the receiving member 70 and the inner peripheral surface of the ink containing portion 11c. When the two spheres 60 sequentially move, the second sphere 60 (the sphere 60 on the left front side in FIG. 7B) becomes the first sphere 60 (the right rear side in FIG. 7B). The ball 60), the first support portion 73a (or 73b), and the front end portion of the annular portion 72 may be supported at three locations. Even in this case, even if the posture of the fountain pen 1 is changed from the writing state to the state in which the pen tip 4 is directed upward, the two balls 60 may not move rearward in the axial direction. In order to avoid such a situation, the length of the pair of second support members 74a and 74b, the diameter of the sphere 60, and the like are adjusted as appropriate, and the dimensions such that the sphere 60 is not supported at the three locations are adopted. There is a need.

  The dimensions of each component of the receiving member 70 employed in the present embodiment, the inner diameter of the ink containing portion 11c, and the diameters of the four spheres 60 are determined based on the above consideration. For this reason, none of the four spheres 60 that have moved to the vicinity of the receiving member 70 are fitted into the vicinity of the window portion 71 of the receiving member 60. That is, when the posture of the fountain pen 1 is changed from the written state to the state in which the pen tip 4 is directed upward, all the four balls 60 move smoothly from the vicinity of the receiving member 70 to the rear in the axial direction. It has become.

  Next, other components of the ink inhaler 100 of the present embodiment will be described in detail.

  FIG. 8 is a schematic view of the ink tank 10 of the ink inhaler 100 of FIG. FIG. 8A is a schematic longitudinal sectional view of the ink tank 10, and FIG. 8B is a schematic front view of the ink tank 10 viewed from the right direction of FIG. 8A. ) Is a cross-sectional view taken along the line CC of FIG.

  As shown in FIG. 8A, the ink tank 10 has a sleeve portion 12 formed on the rear side in the axial direction. The total length of the ink tank 10 is 49.6 mm, and an ink containing portion 11c is defined by a cylindrical portion 11 having an inner diameter of 5.52 mm and an outer diameter of 7.2 mm in an area of 34.9 mm forward in the axial direction. A sleeve portion 12 having a length of 14.2 mm is continuous behind the cylindrical portion 11 in the axial direction. The inner diameter of the sleeve portion 12 is 4.9 mm. A high friction portion 13 is provided on the outer surface of the sleeve portion 12. Specifically, the high-friction portions 13 of the present embodiment are provided as ridges 14 that extend in the circumferential direction of the ink tank 10 and are provided at five locations at substantially equal intervals in the axial direction of the ink tank 10. ing. The inner peripheral surface of the cylindrical portion 11 and the inner peripheral surface of the sleeve portion 12 are continuous via the taper transition portion 11t.

  Further, on the inner peripheral surface of the sleeve portion 12 positioned at the rear side in the axial direction of the ink tank 10, as shown in FIG. 8B, a predetermined height along the axial direction is provided on each of the upper side and the lower side thereof. Raised portions 19a and 19b are provided. However, the raised portions 19a and 19b are interrupted in part in the axial direction by the upper notch 16a and the lower notch 16b shown in FIG. Each of the upper cutout 16a and the lower cutout 16b has an axial length of 1.15 mm, and is formed to be cut out by a height h = 1.225 mm as shown in FIG. 8C. Yes.

  Further, as shown in FIGS. 8A and 8B, groove portions 17 are provided at two positions on the left and right sides of the inner peripheral surface of the sleeve portion 12 positioned axially rearward of the ink tank 10. Each of the groove portions 17 of the present embodiment has a U-shaped cross section with a width of 1.1 mm and a depth of 0.225 mm at the center in the width direction, and 14. It is formed with a length of 2 mm.

  Further, as shown in FIG. 8A, a part of the sleeve portion 12 in the axial direction is centered at a position of 3.4 mm from the axially rear end portion at two locations on the upper and lower sides of the outer surface of the sleeve portion 12. Projections 15 having a width of 0.5 mm in the axial direction are formed so as to extend 120 ° in the circumferential direction.

  Further, as shown in FIG. 8B, the axially rear end of the sleeve portion 12 is provided with notches 18 each having a length of 3.35 mm and a width of 0.7 mm at two left and right portions. Diameter is possible.

  9 is a schematic view of the piston 20 of the ink inhaler 100 of FIG. 3, FIG. 9 (A) is a schematic side view of the piston 20, and FIG. 9 (B) is a piston of FIG. 9 (A). 20 is a cross-sectional view taken along line BB of FIG. 20, and FIG. 9C is a cross-sectional view taken along line CC of the piston 20 of FIG. 9A.

  As shown in FIG. 9A, the rod 21 of the piston 20 has a male screw portion 23s formed on at least a part of the side surface. In the present embodiment, as shown in FIG. 9B, the entire rod 21 has a cylindrical shape that is chamfered to the same depth by two planes parallel to the axial direction and facing each other in parallel. It is formed as a guided portion 23 having a cross section, that is, a cross section having a shape in which two opposing short sides of a rectangle are projected in an arc shape. And the male screw part 23s is formed in the axial direction of the area | region projected over the circular arc shape of the to-be-guided part 23. As shown in FIG.

  In the present embodiment, the total length of the piston is 26.2 mm, the length of the flange portion 22 is 2.4 mm, and the length of the rod 21 is 23.8 mm. The flange portion 22 has a diameter of 5.59 mm. The male threaded portion 23s of the rod 21 (guided portion 23) has an outer diameter of 3.1 mm, a valley diameter of 2.5 mm, and an effective diameter of 2.75 mm. The thickness of the guided portion 23 (guided) The distance between two opposing planes of the part 23) is 1.7 mm.

  Further, in the present embodiment, as shown in FIG. 9C, the protruding portion 24 is formed on the two chamfered planes at the rear of the guided portion 23 in the axial direction. The overhang portion 24 has a diameter that is substantially the same as the valley diameter of the male screw portion 23s.

  FIG. 10 is a schematic longitudinal sectional view of the knob 30 of the ink inhaler 100 of FIG. At least the front region of the knob 30 has a hollow cylindrical shape having a female screw portion 30s. In the present embodiment, as shown in FIG. 10, the axially forward end of the knob 30 is open, but the axially backward end is closed, and the female thread portion 30s is formed on the entire inner peripheral surface. Is formed. The female screw portion 30 s of the knob 30 is screwed with the male screw portion 23 s of the rod 21. In the present embodiment, the overall length of the knob 30 is 22.8 mm, and the length of the female screw portion 30 s is 21.3 mm. In addition, a length of 9.1 mm, which is a substantially regular octagonal cross section and is slightly tapered toward the rear in the axial direction, to be gripped when the user rotates the knob 30 behind the knob 30 in the axial direction. Is provided.

  As shown in FIG. 10, the knob 30 of the present embodiment has a bulging portion 31 having a width of 1 mm in the axial direction centered on a position 10.2 mm from the front of the knob 30 in the axial direction. It is formed so as to swell by 0.325 mm. The front side in the axial direction of the bulging portion 31 is chamfered in a tapered shape. The bulging portion 31 is rotatably engaged with the upper notch 16a and the lower notch 16b of the sleeve portion 12.

  Then, the upper notch 16a and the lower notch 16b and the bulging portion 31 of the knob 30 are engaged by temporarily expanding the diameter of the axially rear end of the sleeve portion 12 due to the presence of the notch 18. It has become so.

  FIG. 11 is a schematic front view of the piston guide 40 of the ink inhaler 100 of FIG. As shown in FIG. 11, the piston guide 40 of the present embodiment has a U-shaped cross section, and two pairs of parallel legs that face each other on a pair of leg portions 42 in the U-shaped cross section. A guide portion 41 that is a flat surface is formed. In the present embodiment, the thickness (axial length) of the piston guide 40 is 1.5 mm, and the outer periphery of the pair of leg portions 42 in the U-shaped cross section is a circular arc having a diameter of 4.75 mm. Forming part. Furthermore, the separation distance between the end portions 42e of the pair of leg portions 42 in the U-shaped cross section of the piston guide 40 is 1.6 mm, which is larger than the separation distance of the two planes of the guide portion 41 of 1.85 mm. It is getting smaller.

  Moreover, as shown in FIG. 11, the protrusion 43 is provided in the axial direction of the piston guide 40 at the two left and right outer peripheral surfaces in the axial direction. The protrusions 43 of the present embodiment are each formed to have a width of 1 mm and a height of 0.275 mm in the center in the width direction, and the groove portions 17 provided at two left and right positions on the inner peripheral surface of the sleeve portion 12 of the ink tank 10. To engage.

  As shown in FIG. 2, the piston guide 40 of the present embodiment is fitted into the sleeve portion 12, and slides the guided portion 23 of the rod 21 in the axial direction. And the overhang | projection part 24 (refer FIG.9 (C)) formed in the axial direction back of the to-be-guided part 23 of the rod 21 is parallel to each other where the guide part 41 (the leg part 42 opposes) seeing in the said axial direction. Two planes).

  FIG. 12 is a schematic longitudinal sectional view of the cover 50 of the ink inhaler 100 of FIG. As shown in FIG. 12, the cover 50 has a cylindrical shape with an axial length of 4.2 mm, an inner diameter of 6.235 mm, and an outer diameter of 6.745 mm. Further, as shown in FIG. 12, on the inner peripheral surface of the cover 50, a groove 51 having a width of 0.6 mm in the axial direction centered on a position of 0.6 mm from both ends in the axial direction of the cover 50. Is formed.

  Next, with reference to FIG. 13, an example of a method for assembling an ink inhaler according to an embodiment of the present invention will be described. 13A is a diagram showing a process of applying grease to the ink tank, FIG. 13B is a diagram showing a process of inserting a piston into the ink tank, and FIG. FIG. 13D is a diagram showing a step of screwing the knob onto the rod of the piston, and FIG. 13E is a diagram showing the step of engaging the knob with the ink tank. FIG. 13F is a diagram showing a process of fitting a cover on the rear side in the axial direction of the ink tank, and FIG. 13G is a process of arranging four spheres in the ink tank. FIG. 13H is a diagram showing a process of inserting the receiving member into the ink tank.

  First, as shown in FIG. 13A, grease for smooth sliding of the flange portion 22 is applied to the entire inner peripheral surface of the ink containing portion 11c of the ink tank 10 using an appropriate applicator T. Applied. Furthermore, although not shown in the figure, grease for smooth sliding and the like of the guided portion 23 including the male screw portion 23 s is applied to the guided portion 23 including the male screw portion 23 s of the piston 20.

  Next, as shown in FIG. 13B, the piston 20 is in the axially forward direction of the ink tank 10 (in the direction in which the flange portion 22 of the piston 20 is positioned in the axially forward direction (left side of FIG. 13B)). It is inserted into the ink tank 10 from the left side of FIG.

  Next, as shown in FIG. 13 (C), it is inserted into the ink tank 10 by a tool having a tip shape corresponding to the shape of the front surface of the flange portion 22 (shown by a broken line in FIG. 13 (C)). The piston 20 thus pushed is further pushed rearward in the axial direction. Thereby, a part of the guided portion 23 of the piston 20 on the rear side in the axial direction protrudes from the end portion on the rear side in the axial direction of the sleeve portion 12 of the ink tank 10.

  Next, as shown in FIG. 13D, the piston guide 40 is attached to the piston guide 40 on the part on the axially rear side of the guided portion 23 protruding from the axially rearward end of the sleeve portion 12. The U-shaped cross section of the pair of leg portions 42 is fitted from the end side (open side). And the protrusion 43 of the piston guide 40 and the groove part 17 of the sleeve part 12 are aligned so that both may engage. Thereafter, from the rear side in the axial direction (the right side in FIG. 13D), the female screw portion 30s of the knob 30 is screwed into the male screw portion 23s of the guided portion 23. Accordingly, the axial direction of the knob 30 is increased. The front end slides the piston guide 40 to a predetermined position forward in the axial direction. During this time, the groove portion 17 of the sleeve portion 12 causes the protrusion 43 of the piston guide 40 to slide in the axial direction.

  In the process of sliding the piston guide 40 to a predetermined position forward in the axial direction, the bulging portion 31 of the knob 30 contacts the raised portions 19a and 19b of the sleeve portion 12 as shown in FIG. When the female screw portion 30s of the knob 30 is further screwed in, the presence of the notch 18 (see FIG. 13B) of the sleeve portion 12 increases the diameter of the end of the sleeve portion 12 in the axial direction, and the knob 30 The raised portions 19 a and 19 b of the sleeve portion 12 ride on the tapered chamfered portion of the bulging portion 31. Thereafter, when the female screw portion 30 s of the knob 30 is further screwed, the bulging portion 31 engages with the upper notch 16 a and the lower notch 16 b (region where the raised portions 19 a and 19 b do not exist) of the sleeve portion 12. Thereby, the edge part of the axial direction back of the sleeve part 12 returns to the state before diameter expansion. The position of the piston guide 40 at this time is the predetermined position.

  The knob 30 is moved relative to the sleeve portion 12 by screwing the female screw portion 30s of the knob 30, and the bulging portion 31 of the knob 30 and the upper notch 16a and the lower notch 16b of the sleeve portion 12 are engaged. Instead of fitting, the knob 30 is simply pushed in the axial direction with respect to the sleeve portion 12 to move the knob 30 relative to the sleeve portion 12 so that the bulging portion 31 of the knob 30 and the upper notch of the sleeve portion 12 are cut out. You may engage 16a and the lower notch 16b.

  Next, as shown in FIG. 13F, a cylindrical cover 50 is fitted to the sleeve portion 12 in the axial direction rearward. At this time, the protrusion 15 of the sleeve portion 12 and the concave stripe 51 of the cover 50 are engaged. As described above, the cover 50 is formed with two concave stripes 51 on the inner peripheral surface at positions equidistant from both axial ends of the cover 50. For this reason, the cover 50 can be fitted to the sleeve portion 12 from one side or the other side.

  Next, as shown in FIG. 13G, in a state where the axis of the ink tank 10 is horizontal, or in a state where the front end is above the rear end, the four balls 60 are moved to the axis of the ink tank 10. It inserts from the opening part of the direction front, and arrange | positions in the ink accommodating part 11c.

  Next, as shown in FIG. 13H, the receiving member 70 is pushed into a predetermined position in the ink containing portion 11c using an appropriate jig. At this time, the protrusion 76 provided on the outer peripheral surface of the annular portion 72 of the receiving member 70 bites into the inner peripheral surface of the ink containing portion 11c, whereby the receiving member 70 is fixed to the inner peripheral surface. At this time, the receiving member 70 is positioned so that the rear end portion of the annular portion 72 is in front of the front end portion of the flange portion 22 when the flange portion 22 of the piston 20 is positioned at the foremost position in the axial direction. The

  Next, the operation of the ink inhaler 100 of the present embodiment will be described.

  First, the shaft cylinder 2 of the fountain pen 1 is rotated in one direction around the axis with respect to the pen tip support 3 and removed from the pen tip support 3 to expose the knob 30 of the ink inhaler 100. Depending on the product, at the time of purchase, the piston 20 is in a state of being positioned at the foremost position in the axial direction of the ink containing portion 11c of the ink tank 10. Otherwise, the knob 30 is rotated in one direction, and the male screw portion 23s of the piston 20 is sent out through the female screw portion 30s of the knob 30, thereby causing the piston 20 to move to the ink in the ink tank 10. The housing portion 11c is positioned at the forefront in the axial direction.

  When the male screw portion 23 s of the piston 20 is sent out by this rotation operation, the guide portion 41 of the piston guide 40 fitted in a predetermined position of the sleeve portion 12 of the ink tank 10 causes the guided portion 23 of the piston 20 to move in the axial direction. To slide. Thus, the piston 20 does not rotate around the axis.

  Further, when the male screw portion 23 s of the piston 20 continues to be fed by the rotation operation of the knob 30, the overhang portion 24 of the piston 20 comes into contact with the piston guide 40. This restricts the subsequent feeding of the male screw portion 23s (stopper function). This prevents the male screw portion 23 s of the piston 20 from coming off from the female screw portion 30 s of the knob 30. The position of the piston 20 at this time is the foremost position in the axial direction of the piston 20.

  As described above, the receiving member 70 according to the present embodiment is disposed forward in the axial direction from the position of the flange portion 22 when the piston 20 is positioned at the foremost position in the axial direction. Does not interfere with the receiving member 70.

  Next, the nib 4 of the fountain pen 1 is immersed in the ink in the ink container, and the knob 30 is rotated in the opposite direction in this state. Along with this, the piston 20 in the ink containing portion 11c is moved rearward in the axial direction of the ink containing portion 11c (on the right side in FIG. 2B). Thereby, a negative pressure is generated in the ink containing portion 11c, and the ink is sucked into the ink containing portion 11c from the ink container through the pen tip 4. When the knob 30 is further rotated in the opposite direction, the piston 20 is moved to the farthest rear in the axial direction of the ink containing portion 11c. Thereby, the suction of the ink into almost the entire interior of the ink containing portion 11c is completed. Then, the shaft cylinder 2 is re-attached (screwed) to the pen tip support portion 3 by rotating the shaft tube 2 in the other direction around the axis with respect to the pen tip support portion 3.

  The fountain pen 1 in which the ink has been sucked into the ink inhaler 100 as described above is normally stored with the pen tip 4 facing upward when writing is not being performed. When writing with the fountain pen 1, the cap of the fountain pen 1 is removed, and the posture is changed from a state in which the pen tip 4 is directed upward to a state in which the pen tip 4 is directed downward. At this time, in the fountain pen 1 according to the present embodiment, the four spheres 60 positioned in the axial rearward direction of the ink containing portion 11c move forward (downward) in the axial direction to overcome the surface tension of the ink. Then, it moves to the vicinity of the window 71 of the receiving member 70. At this time, the ink that has been positioned rearward in the axial direction in the ink containing portion 11 c also moves with the four balls 60. In the present embodiment, since the collar portion 6 of the pen tip support portion 3 penetrates the window portion 71 of the receiving member 70, at least one of the four balls 60 moved forward in the axial direction is It contacts the part 6 (see FIG. 6). As a result, the ink moved together with the four spheres 60 is guided to the collar portion 6.

  The ink guided to the collar portion 6 is guided to the rear end portion of the pen tip support portion 3 through the collar portion 6 and further guided to the pen tip 4 through the ink communication hole 5 by capillary action. At this time, a negative pressure is generated in the ink containing portion 11c due to a decrease in ink in the ink containing portion 11c. For this reason, as shown in FIG. 6, external air is introduced into the ink containing portion 11 c through the air communication hole 8 as bubbles. In the present embodiment, since the diameters of the four spheres 60 are all 2 mm and the inner diameter of the ink containing portion 11c is 5.52 mm, the bubbles are formed between the sphere 60 and the inner peripheral surface of the ink containing portion 11c. Sufficient space is secured to pass. For this reason, the rising of the bubbles is not hindered by the four balls 60 moved to the front in the axial direction (in the vicinity of the receiving member 70). That is, smooth replacement of air and ink is realized.

  When writing with the fountain pen 1 is completed, for example, after the cap is attached to the fountain pen 1 again, the posture is changed from the state in which the pen tip 4 is directed downward to the state in which it is directed upward. As described above, the receiving member 70 of the present embodiment has a shape such that the sphere 60 does not fit tightly between the receiving member 70 and the inner peripheral surface of the ink containing portion 11c. For this reason, the four spheres 60 smoothly move from the vicinity of the receiving member 70 toward the rear in the axial direction of the ink containing portion 11c. And it positions in the saucer-like space of the flange part 22 of the piston 20 (refer FIG.3 and FIG.4).

  According to the fountain pen 1 of the present embodiment as described above, the four spheres 60 are more reliably prevented from falling by the receiving member 70 and are axially rearward from the rear end portion of the pen tip support portion 3. Since the extending collar 6 passes through the window 71 provided in the receiving member 70, the ball 60 and the collar 6 that have moved to the axially forward receiving member 70 (or to the vicinity of the receiving member 70). Are more reliably brought into contact with each other, and as a result, the ink can be more reliably guided to the collar portion 6. Moreover, since the manufacturing cost of the sphere 60 is lower than that of the cylindrical moving body, the manufacturing cost of the fountain pen 1 can be reduced.

  In addition, the receiving member 70 employed in the ink inhaler of the present embodiment is a support member that supports the disk portion 75, and from the opposing position on the inner peripheral surface of the ink containing portion 11c, the ink containing portion 11c. A pair of first support portions 73a and 73b extending inward in the radial direction and a pair of second support portions extending from the radially inner ends of the pair of first support portions 73a and 73b in the axial direction forward of the ink containing portion 11c. The disk portion 75 is fixed to the front end portions of the pair of second support portions. Accordingly, it is easy to avoid interference between the support member and the collar portion 6 when the ink inhaler 100 is attached to the pen tip support portion 3.

  In the present embodiment, four spheres 60 are employed as the moving body. However, for example, two to three spheres, or five or more spheres may be employed.

  Further, as described above, the flange portion 6 extending axially rearward from the rear end portion of the pen tip support portion 3 has a truncated fan-shaped cross-sectional shape with a central angle of approximately 180 °, and The window part 71 provided in the receiving member 70 is penetrated. Accordingly, since the degree of freedom of the shape that can be adopted as the moving body is increased, it is also possible to adopt a moving body having a shape other than a sphere such as a tetrahedron or a cube.

DESCRIPTION OF SYMBOLS 1 Fountain pen 2 Shaft cylinder 3 Pen tip support part 4 Pen tip 5 Ink communication hole 6 Groove part 7 Groove 8 Air communication hole 10 Ink tank 11 Cylindrical part 11c Ink storage part 11t Taper transition part 12 Sleeve part 13 High friction part 14 Projection Ridge 15 protrusion 16a upper notch 16b lower notch 17 groove 18 notches 19a and 19b raised portion 20 piston 21 rod 22 flange portion 23 guided portion 23s male screw portion 24 overhang portion 30 knob 30s female screw portion 31 bulge portion 40 Piston guide 41 Guide part 42 Leg part 42e End part 43 of leg part 50 Protrusion 50 Cover 51 Groove 60 Ball 70 Receiving member 71 Window part 72 Annular part 73a, 73b One pair of first support parts 74a, 74b One pair of first parts 2 support part 75 disk part 76 protrusion 100 ink inhaler

Claims (7)

A barrel,
A pen tip support portion provided on the front side of the shaft cylinder, having a pen tip and an ink communication hole reaching the pen tip;
In the shaft cylinder, an ink inhaler provided on the rear side of the nib support part,
In the shaft tube, a collar portion extending rearward in the axial direction from the rear end portion of the pen tip support portion;
With
The ink inhaler is
A cylindrical ink tank that defines an ink containing portion for containing ink forward in the axial direction;
A flange portion that is slidable and liquid-tightly fitted in the axial direction of the ink containing portion on the inner peripheral surface of the ink containing portion, and a rod that extends from the flange portion toward the rear in the axial direction of the ink tank, A piston having
A receiving member having a window portion that is fixed inside the ink storage portion and is penetrated by the flange portion, in an axially forward direction from the flange portion of the piston,
In the inside of the ink containing portion, the flange is disposed between the flange portion of the piston and the receiving member , has a size that cannot pass through the window portion, and the flange portion that passes through the window portion. contact possible, and at least one mobile,
Writing instrument characterized by having. The writing instrument according to claim 1, wherein the collar has a truncated fan-shaped cross-sectional shape. The receiving member has a disc portion that is smaller in diameter than the inner diameter of the ink containing portion, is concentric with the central axis of the ink containing portion and is disposed perpendicular to the central axis, and the disc portion is connected to the ink containing portion of the ink containing portion. The writing instrument according to claim 1, further comprising a support member fixed to the inner peripheral surface. The said support member has a shape that the said disk part is located in the front of an axial direction with respect to the fixing | fixed part of the said support member with respect to the internal peripheral surface of the said ink accommodating part. Writing instrument as described in. The support member includes a pair of first support portions extending inward in the radial direction of the ink storage portion from opposing positions on the inner peripheral surface of the ink storage portion, and the radial direction of the pair of first support portions. A pair of second support portions extending from the inner end portion in the axial direction of the ink containing portion;
The writing instrument according to claim 4, wherein the disk portion is fixed to a front end portion of the pair of second support portions. 6. The writing instrument according to claim 1, wherein the at least one moving body is at least two spheres. The writing instrument according to claim 1, wherein the at least one moving body is four spheres.

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