JP6400427B2 - Ink inhaler - Google Patents

Description

  The present invention relates to an ink inhaler such as a fountain pen. More specifically, the present invention relates to an ink inhaler that sucks ink by moving a piston back and forth when a knob is rotated while a pen tip such as a fountain pen is immersed in ink in an ink container.

  FIG. 11 is a schematic longitudinal sectional view of a conventional ink inhaler 400 used for a fountain pen or the like. As shown in FIG. 11, a conventional ink inhaler 400 includes a cylindrical ink tank 410 that defines an ink storage portion 411c that stores ink in the front in the axial direction, and the ink on the inner peripheral surface of the ink storage portion 411c. A piston 420 having a flange portion 422 slidably and liquid-tightly fitted in the housing portion 411c and a rod 421 extending from the flange portion 422 toward the rear in the axial direction of the ink tank 410; And a knob 430 rotatably connected to the ink tank 410 at the rear side in the axial direction of the tank 410. A male screw portion 423 s is formed on at least a part of the side surface of the rod 421 of the piston 420, and at least a front region of the knob 430 has a hollow cylindrical shape having a female screw portion 430 s, and the male screw portion of the rod 421. 423s and the female screw portion 430s of the knob 430 are screwed together.

  On the rear side in the axial direction of the ink tank 410, one side of a cylindrical cover 450 having a diameter larger than the outer periphery of the ink tank 410 is bonded and fixed. The other side of the cover 450 has a larger diameter than the outer circumference of the knob 430 in the axial direction, and a throttle portion is provided at the other side end of the cover 450 and is provided on the outer circumference of the knob 430. The knob 430 is supported so as to be rotatable with respect to the cover 450 while restricting the rearward movement of the flange in the axial direction.

  In general, 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 450 to the rear side in the axial direction of the ink tank 410. Usually, the ink tank 410 is made of transparent resin, the knob 430 and the piston 420 are made of colored resin, and the cover 450 is made of metal.

  The ink inhaler 400 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 400 to inhale ink as described above, first, a casing such as a fountain pen is removed, and the knob 430 of the ink inhaler 400 is exposed. Then, if necessary, the knob 430 is rotated in one direction (direction A in FIG. 11) to position the piston 420 at the forefront of the ink tank 410 in the axial direction. Next, a pen tip such as a fountain pen is immersed in the ink in the ink container, and in this state, the knob 430 is rotated in the opposite direction (direction B in FIG. 11). Along with this, the piston 420 in the ink tank 410 moves rearward in the axial direction of the ink tank 410. As a result, a negative pressure is generated in the ink tank 410, and the ink is sucked into the ink tank 410 from the ink container through the pen tip.

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

  For fountain pens, etc., it is necessary to remove the ink inhaler from the main body for maintenance (cleaning) of the nib and ink color exchange. When the user removes the ink inhaler from the fountain pen, etc., if the user grips the knob of the ink inhaler and tries to pull it back in the axial direction, the knob moves in the radial direction due to play between the knob and the cover. Therefore, there is a concern that the flange of the knob may pass through the aperture of the cover. Therefore, the user wants to urge the user to grip the ink tank or cover, not the knob, and pull it back in the axial direction.

  However, since the conventional cover is generally made of metal as described above in order to avoid deformation of the throttle portion, there is a problem that the outer peripheral surface is slippery and is not suitable for gripping by the user. Further, the cover has a predetermined length in the axial direction because it needs to be bonded and fixed to the ink tank on one side and to rotatably support the knob on the other side. For this reason, the exposed area in the axial rearward direction of the ink tank is narrow, and there is a problem that the ink tank is not suitable for gripping by the user.

  In view of the above problems, an object of the present invention is to provide an ink inhaler that can prompt a user to grip an ink tank and pull it out rearward in the axial direction.

  The present invention includes a cylindrical ink tank that defines an ink containing portion for containing ink forward in the axial direction, and an inner circumferential surface of the ink containing portion that is slidable and liquid-tight in the axial direction of the ink containing portion. A piston having a flange portion formed therein, a rod extending from the flange portion toward the rearward in the axial direction of the ink tank, and the ink tank rotatable relative to the ink tank at the rearward in the axial direction of the ink tank. A hollow cylinder having a male screw part formed on at least a part of a side surface of the rod of the piston, and at least a front region of the knob having a female screw part. The male threaded portion of the rod and the female threaded portion of the knob are screwed together, and an engaging portion is formed at least in the circumferential direction at the rear of the ink tank in the axial direction. And an engaged portion that is rotatably engaged with the engaging portion is formed at least in a circumferential direction at a part of the knob in the axial direction. In addition, a notch is provided so that the diameter can be increased, and the engaging portion and the engaged portion are engaged by temporarily expanding the end of the ink tank. An ink inhaler for a writing instrument, wherein a cylindrical cover is fitted on the rear side in the axial direction of the ink tank.

  According to the present invention, the engagement portion formed at the rear side in the axial direction of the ink tank and the engaged portion formed at a part in the axial direction of the knob temporarily enlarge the diameter of the end portion of the ink tank. On the other hand, a cylindrical cover is fitted on the rear side in the axial direction of the ink tank, and the cover effectively prevents the end of the ink tank from expanding. By adopting such a configuration, the length of the cover in the axial direction can be significantly reduced as compared with the conventional case. As a result, the exposed area in the axial rearward direction of the ink tank can be greatly enlarged, so that the user can be encouraged to grip the ink tank instead of the knob and cover and pull it out rearward in the axial direction.

  Preferably, the axial length of the cover is 10 mm or less. In this case, since the exposed area of the ink tank can be further greatly expanded, the user can be further urged to grip the ink tank instead of the knob and cover and pull it out rearward in the axial direction.

  Preferably, a high-friction portion is provided on at least a part of the side surface in the axial direction of the ink tank with respect to the cover. In this case, it is possible to prompt the user to grip the high friction portion of the ink tank and pull it out rearward in the axial direction.

  The high friction portion is preferably configured as a ridge extending over at least a part of the ink tank in the circumferential direction. In this case, the high friction part of the ink tank can be easily formed at low cost.

  The ink tank is preferably made of a transparent resin. In this case, the visibility of the ink tank from the outside is remarkably improved in combination with the fact that the exposed area on the rear side in the axial direction of the ink tank is greatly enlarged. This is excellent in design and meets the needs of users.

  Preferably, at least a part of the cover in the axial direction is provided with a second engagement portion in at least a part of the circumferential direction, and at least a part of the ink tank in the axial direction has a circumferential direction. A second engaged portion is provided on at least a part of the cover, and the cover is fitted to an end portion of the ink tank by engaging the second engaged portion and the second engaged portion. ing. In this case, the position of the cover can be easily held at a predetermined position behind the ink tank in the axial direction.

  Further, according to the present invention, the ink inhaler includes a cylindrical ink tank that defines an ink containing portion for containing ink forward in the axial direction, and an inner peripheral surface of the ink containing portion in the axial direction of the ink containing portion. A piston having a flange portion that is slidably and liquid-tightly fitted, a rod that extends from the flange portion toward the rearward in the axial direction of the ink tank, and an axially rearward portion of the ink tank to the ink tank. A knob connected to the inside of the ink tank so as to be rotatable relative to the inside of the ink tank, and a male thread portion is formed on a side surface of at least a part of the rod of the piston. A double cylinder having an inner cylinder and an outer cylinder each having a female thread portion, and the male thread portion of the rod and the female thread portion of the knob are screwed to each other, and are axially rearward of the ink tank. The engaging part is formed in at least a part in the circumferential direction, and the engaged part is rotatably engaged with the engaging part in at least a part in the circumferential direction at a part in the axial direction of the knob. A joint portion is formed, and an end portion of the outer cylinder of the knob is provided with a notch so that the diameter can be increased. The engaging portion and the engaged portion are provided on the knob. The outer cylinder is engaged by temporarily expanding the diameter of the outer cylinder, and a cylindrical cover is fitted in front of the knob in the axial direction of the outer cylinder. .

  According to the present invention, the engagement portion formed at the rear side in the axial direction of the ink tank and the engaged portion formed at a part in the axial direction of the knob temporarily enlarge the diameter of the end portion of the ink tank. On the other hand, a cylindrical cover is fitted on the rear side in the axial direction of the ink tank, and the cover effectively prevents the end of the ink tank from expanding. By adopting such a configuration, the length of the cover in the axial direction can be significantly reduced as compared with the conventional case. As a result, since the exposed area in the axial direction of the ink tank can be greatly enlarged, it is possible to prompt the user to grip the ink tank instead of the knob and cover and pull it out rearward in the axial direction.

  In this case, preferably, at least a part of the cover in the axial direction is provided with a second engagement portion at least in a circumferential direction, and at least a part of the knob outer cylinder in the axial direction is provided. A second engaged portion is provided in at least a part of the circumferential direction, and the cover is engaged with the second engaged portion and the second engaged portion so that the outer cylinder of the knob is engaged. It is fitted axially forward. By adopting such a configuration, the position of the cover can be easily held at a predetermined position on the rear side in the axial direction of the ink tank.

  According to the present invention, the axial length of the cover can be greatly reduced as compared with the conventional case by fitting the cylindrical cover to the rear side of the ink tank in the axial direction. As a result, since the exposed area in the axial direction of the ink tank can be greatly enlarged, it is possible to prompt the user to grip the ink tank instead of the knob and cover and pull it out rearward in the axial direction.

  Or according to this invention, the axial length of a cover can be reduced significantly conventionally compared with the axial direction front of the outer cylinder of a knob by fitting a cylindrical cover. As a result, the axial length of the ink tank can be greatly increased as compared with the conventional case, and the user can be encouraged to grip the ink tank instead of the knob and cover and pull it out in the axial direction.

It is a schematic longitudinal cross-sectional view of the ink inhaler of the 1st Embodiment of this invention. FIG. 1A is a diagram illustrating a state in which the piston is the rearmost in the axial direction, and FIG. 1B is a diagram illustrating a state in which the piston is the foremost in the axial direction. It is the schematic of the ink tank of the ink inhaler of FIG. 2A is a schematic longitudinal sectional view of the ink tank, FIG. 2B is a schematic front view of the ink tank viewed from the right direction of FIG. 2A, and FIG. FIG. 3 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. 3A is a schematic side view of the piston, FIG. 3B is a cross-sectional view taken along the line BB of FIG. 3A, and FIG. 3C 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. FIG. 7A is a diagram illustrating a process of applying grease to the ink tank, FIG. 7B is a diagram illustrating a process of inserting a piston into the ink tank, and FIG. FIG. 7D is a diagram illustrating a process of screwing the knob onto the piston rod, and FIG. 7E is a diagram illustrating the process of engaging the knob with the ink tank. FIG. 7F is a diagram illustrating a process of fitting the cover to the rear side in the axial direction of the ink tank. It is a schematic longitudinal cross-sectional view of the ink inhaler of the 2nd Embodiment of this invention. It is a schematic longitudinal cross-sectional view of the ink tank of the ink inhaler of FIG. It is a schematic longitudinal cross-sectional view of the knob of the ink inhaler of FIG. FIG. 10A is a schematic longitudinal sectional view of the knob, and FIG. 10B is a schematic side view of the knob. It is a schematic longitudinal cross-sectional view of the conventional ink inhaler.

  Hereinafter, a first 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 an ink inhaler 100 according to a first embodiment of the present invention. FIG. 1A is a diagram illustrating a state in which the piston 20 is the rearmost in the axial direction, and FIG. 1B is a diagram illustrating a state in which the piston 20 is the foremost in the axial direction.

  As shown in FIG. 1, the ink inhaler 100 according to the first embodiment of the present invention 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.

  FIG. 2 is a schematic view of the ink tank 10 of the ink inhaler 100 of FIG. 2A is a schematic longitudinal sectional view of the ink tank 10, and FIG. 2B is a schematic front view of the ink tank 10 viewed from the right direction of FIG. 2A. ) Is a cross-sectional view taken along the line CC of FIG.

  As shown in FIG. 2A, 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 5.67 mm and an outer diameter of 7.2 mm in an area of 34.5 mm forward in the axial direction. A sleeve portion 12 having a length of 15.1 mm is continuous behind the cylindrical portion 11 in the axial direction. The inner diameter of the sleeve portion 12 is 4.9 mm, but the 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. 2B, 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. Yes.

  Further, as shown in FIGS. 2A and 2B, groove portions 17 are provided at two locations 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 having a width of 1.1 mm and a depth of 0.875 mm at the center in the width direction, and 14. It is formed with a length of 2 mm.

  A second engaged portion is formed in a part of the sleeve portion 12 in the axial direction. In the present embodiment, as shown in FIG. 2 (A), the width of 0.5 mm in the axial direction is centered at a position of 3.4 mm from the axially rearward end at the upper and lower portions of the outer surface of the sleeve portion 12. The projecting portion 15 is formed as a second engaged portion so as to extend 120 ° in the circumferential direction.

  Further, as shown in FIG. 2B, 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.

  3 is a schematic view of the piston 20 of the ink inhaler 100 of FIG. 1, FIG. 3 (A) is a schematic side view of the piston 20, and FIG. 3 (B) is a piston of FIG. 3 (A). 20 is a cross-sectional view taken along the line B-B of FIG. 20, and FIG. 3C is a cross-sectional view taken along the line C-C of the piston 20 of FIG.

  As shown in FIG. 3A, the rod 21 of the piston 20 is formed with a male screw portion 23s on at least a part of the side surface. In the present embodiment, as shown in FIG. 3B, 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 26.7 mm, the length of the flange portion 22 is 2.4 mm, and the length of the rod 21 is 24.3 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. 3C, the projecting portion 24 is formed in an arc shape on the rear side in the axial direction of the guided portion 23, and the projecting portion 24 is The diameter is substantially the same as the valley diameter of the male screw portion 23s.

  FIG. 4 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. 4, the axially forward end of the knob 30 is open, but the axially backward end is closed, and the female screw 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.

  Furthermore, an engaged portion that is rotatably engaged with the upper notch 16a and the lower notch 16b of the sleeve portion 12 is formed on at least a portion of the knob 30 in the axial direction. . In the present embodiment, as shown in FIG. 4, a bulging portion 31 having a width of 1 mm in the axial direction around a position of 10.2 mm from the front in the axial direction of the knob 30 is used as the engaged portion in the circumferential direction. Further, it is formed to bulge by a height of 0.325 mm. The front side in the axial direction of the bulging portion 31 is chamfered in a tapered shape.

  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. 5 is a schematic front view of the piston guide 40 of the ink inhaler 100 of FIG. As shown in FIG. 5, the piston guide 40 of the present embodiment has a U-shaped cross section, and two parallel planes facing each other on the pair of leg portions 42 in the U-shaped cross section. Is formed as a guide portion 41. In the present embodiment, the piston guide 40 has a thickness (axial length) of 1.5 mm, and the outer periphery of the pair of leg portions 42 in the U-shaped cross section is a part of an arc having a diameter of 4.75 mm. Is forming. Further, 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 smaller than the separation distance of the two planes of the guide portion 41 of 1.95 mm. It has become.

  Further, as shown in FIG. 5, protrusions 43 having a non-circular cross section are provided on the left and right outer peripheral surfaces of the piston guide 40 in the axial direction over the entire 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. 1, the piston guide 40 according to 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.3 (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. 6 is a schematic longitudinal sectional view of the cover 50 of the ink inhaler 100 of FIG. As shown in FIG. 6, the cover 50 has a cylindrical shape with an axial length of 4.2 mm, an inner diameter of 6.25 mm, and an outer diameter of 6.73 mm. At least a part of the cover 50 in the axial direction is provided with a second engaging portion in at least a part of the circumferential direction. In the present embodiment, as shown in FIG. 6, the inner peripheral surface of the cover 50 has a width of 0.6 mm in the axial direction centering on a position of 0.6 mm from both ends of the cover 50 in the axial direction. A concave line 51 is formed as the second engaging portion.

  Next, an example of a method for assembling the ink inhaler according to the first embodiment of the present invention will be described with reference to FIG. FIG. 7A is a diagram illustrating a process of applying grease to the ink tank 10, and FIG. 7B is a diagram illustrating a process of inserting the piston 20 into the ink tank 10, and FIG. These are figures which show the process of assembling piston guide 40 to piston 20, Drawing 7 (D) is a figure showing the process of screwing knob 30 to rod 21 of piston 20, and Drawing 7 (E) FIG. 7F is a diagram showing a process of fitting the cover 40 on the rear side in the axial direction of the ink tank 10.

  First, as shown in FIG. 7A, 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 drawing, the guided portion 23 including the male screw portion 23s of the piston 20 is coated with grease for smoothly sliding the guided portion 23 including the male screw portion 23s.

  Next, as shown in FIG. 7B, the piston 20 is in the axially forward direction of the ink tank 10 with the flange portion 22 of the piston 20 positioned in the axially forward direction (left side of FIG. 7B). The ink tank 10 is inserted from the left side of FIG.

  Next, as shown in FIG. 7C, the tool 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. 7C). 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. 7D, 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. 7D), the female screw portion 30s of the knob 30 is screwed into the male screw portion 23s of the guided portion 23, and 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. 7B) 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. 7F, a cylindrical cover 50 is fitted on 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, the operation of the ink inhaler 100 of the present embodiment will be described.

  First, a casing such as a fountain pen is removed, and the knob 30 of the ink inhaler 100 is exposed. Depending on the product, at the time of purchase, as shown in FIG. 1B, the piston 20 is in a state of being positioned at the foremost position in the axial direction of the ink containing portion 11 c 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, as shown in FIG. As described above, the piston 20 is positioned at the forefront in the axial direction of the ink containing portion 11 c of the ink tank 10.

  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. Thereby, 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.

  Next, a pen tip such as a fountain pen is immersed in the ink in the ink container, and in this state, the knob 30 is rotated in the opposite direction. 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 (right side in FIG. 1B). As a result, a negative pressure is generated in the ink containing portion 11c, and ink is sucked into the ink containing portion 11c from the ink container through the pen tip. When the knob 30 is further rotated in the opposite direction, as shown in FIG. 1A, the piston 20 is moved to the rearmost side in the axial direction of the ink containing portion 11c. Thereby, the ink suction to substantially the entire inside of the ink containing portion 11c is completed.

  In the ink inhaler 100 of the present embodiment as described above, the upper notch 16a and the lower notch 16b formed in the sleeve portion 12 of the ink tank 10 and the bulging portion 31 formed in a part of the knob 30 are provided. However, while the end portion of the sleeve portion 12 is temporarily expanded by the presence of the cut 18, a cylindrical cover 50 is fitted on the rear side in the axial direction of the sleeve portion 12. The cover 50 effectively prevents the diameter of the end portion of the sleeve portion 12 from expanding. By adopting such a configuration, the length of the cover 50 in the axial direction is significantly reduced as compared with the conventional case. As a result, the exposed area of the sleeve portion 12 is greatly expanded, and when the ink inhaler 100 of the present embodiment is removed from the main body of the fountain pen or the like in order to perform maintenance (cleaning) of the fountain pen or replace the ink color. The user is prompted to grip the sleeve portion 12 instead of the knob 30 and the cover 50 and pull it out rearward in the axial direction.

  In the present embodiment, the axial length of the cover 50 is only 4.2 mm. As a result, the exposed area of the sleeve portion 12 is further greatly enlarged, and the user is further encouraged to grip the sleeve portion 12 instead of the knob 30 and the cover 50 and pull it out rearward in the axial direction.

  Further, in the present embodiment, the high friction portion 13 (see FIG. 2A) is provided on the outer surface of the sleeve portion 12 in the axial direction front with respect to the cover 50. For this reason, the user can easily pull out the ink inhaler 100 from the main body by easily grasping the high friction portion 13 of the sleeve portion 12. The high friction portion 13 of the present embodiment is configured as a ridge 14 extending over at least a portion of the sleeve portion 12 in the circumferential direction. For this reason, the high friction part 13 can be easily formed at low cost.

  The ink tank 10 of the present embodiment is made of a transparent resin. For this reason, the visibility of the ink tank 10 from the outside is remarkably improved in combination with the greatly expanded exposed area of the sleeve portion 12. This is excellent in design and meets the needs of users.

  Further, in the present embodiment, the concave strip 51 provided on the inner peripheral surface of the cover 50 is engaged with the protrusion 15 of the sleeve portion 12 and is fitted to the end portion of the sleeve portion 12. For this reason, the position of the cover 50 can be easily held at a predetermined position behind the sleeve portion 12 in the axial direction.

  Next, FIG. 8 is a schematic longitudinal sectional view of an ink inhaler 200 according to the second embodiment of the present invention. FIG. 9 is a schematic longitudinal sectional view of the ink inhaler 200 in FIG. 8 and FIG. 10 is a schematic diagram of the knob 230 of the ink inhaler 200 in FIG. 8, and FIG. FIG. 10B is a schematic longitudinal sectional view of the knob 230, and FIG. 10B is a schematic side view of the knob 230.

  As shown in FIG. 8, the ink inhaler 200 according to the present embodiment has a cylindrical shape that defines an ink accommodating portion 211c that accommodates ink forward in the axial direction, like the ink inhaler 100 according to the first embodiment. Ink tank 210, flange portion 222 slidably fitted in the axial direction of ink containing portion 211 c on the inner peripheral surface of ink containing portion 211 c, and axial direction of ink tank 210 from the flange portion 222. A piston 220 having a rod 221 extending rearward, and a knob 230 connected to the ink tank 210 so as to be rotatable with respect to the ink tank 210 in the axially rearward direction of the ink tank 210. .

As shown in FIG. 9, the ink tank 210 of the present embodiment is provided with a notch 216 as an engaging portion on the entire outer circumferential surface of the sleeve portion 212. Notch 216, the axially rearward end in the axial direction around the position of 2.475mm wide and 1.15mm that have a depth of 0.5 mm. Other configurations of its is substantially the same as the ink tank 10 of the first embodiment. 8 and 9, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 10, the knob 230 is a double cylinder having an inner cylinder 232 and an outer cylinder 233 having at least a front threaded portion with a female screw portion 230 s. In the present embodiment, as shown in FIG. 10A, the axially forward end portion of the inner cylinder 232 is open, but the axially backward end portion is closed, and the entire inner peripheral surface is female. A screw portion 30s is formed.
The outer cylinder 233 has a flange portion formed on the outer surface of the inner cylinder 232 at a position 9.1 mm from the axially rear side of the inner cylinder 232, and 5.9 mm from the outer periphery of the flange portion toward the front in the axial direction. And a cylindrical member having an inner diameter of 6.3 mm and an outer diameter of 7.3 mm. Further, as shown in FIG. 10A, the inner peripheral surface of the outer cylinder 233 has a width of 1 mm in the axial direction centering on a position 1.2 mm from the axially forward end of the outer cylinder 233. The bulging portion 235 is formed as a portion to be engaged so as to bulge by a height of 0.325 mm in the circumferential direction. The front side in the axial direction of the bulging portion 235 is chamfered in a tapered shape.

  Further, as shown in FIG. 10B, the axially forward end of the outer cylinder 233 is provided with cuts 234 each having a length of 3.35 mm and a width of 0.7 mm at the two left and right sides. Diameter is possible. The notch 216 of the ink tank 210 and the bulging portion 235 of the knob 230 are engaged by temporarily expanding the diameter of the axially forward end of the outer cylinder 233 due to the presence of the notch 234. Yes.

  Further, a second engaged portion is formed on a part of the outer cylinder 233 in the axial direction. In the present embodiment, as shown in FIG. 10 (B), in the upper and lower two places on the outer surface of the outer cylinder 233, 0.5 mm in the axial direction centering on the position 0.6 mm from the axially rearward front end. The projecting portion 15 having a width of 1 is formed as a second engaged portion so as to extend 120 ° in the circumferential direction.

  Next, an example of a method for assembling the ink inhaler 200 of the present embodiment will be described. Prior to assembly, in addition to the ink tank 210 and knob 230 shown in FIGS. 9 and 10, respectively, a piston 220, a piston guide 240, and a cover 250 similar to those of the ink inhaler 100 of the first embodiment are prepared. However, the cover 250 has an inner diameter of 7.4 mm, an outer diameter of 7.88 mm, and a larger diameter than the cover 50 of the first embodiment.

  First, similar to the ink inhaler 100 of the first embodiment, grease for smooth sliding of the flange portion 222 of the piston 220 is formed on the entire inner peripheral surface of the ink containing portion 211c of the ink tank 210. Applied. Further, grease is applied to the guided portion 223 (see FIG. 8) including the male screw portion 223s of the piston 220 so as to smoothly slide the guided portion 223 including the male screw portion 223s.

  Next, as in the first embodiment, the piston 220 is pushed into the ink tank 210, and a part of the guided portion 223 of the piston 220 on the rear side in the axial direction of the sleeve portion 212 of the ink tank 210. It protrudes from the axially rear end.

  Next, a piston guide 240 is attached to a part of the guided portion 223 protruding from the axially rear end of the sleeve portion 212 on the axially rear side, and a pair of legs in a U-shaped cross section of the piston guide 240. It is inserted from the end side (open side) of the part. Then, the protrusion of the piston guide 240 and the groove portion 212 of the sleeve portion 212 are aligned so that they are engaged with each other. Thereafter, the female threaded portion 230s of the knob 230 is screwed into the male threaded portion 223s of the guided portion 223 from the rear side in the axial direction, and accordingly, the axially forward end portion of the knob 230 is moved to the piston guide 240. Is slid to a predetermined position in the axial direction.

  In the process of sliding the piston guide 240 to a predetermined position forward in the axial direction, the bulging portion 235 of the knob 230 abuts on the axially rear end of the sleeve portion 212. Then, when the female thread portion 230s of the knob 230 is further screwed in, the presence of the notch 234 in the outer tube 233 increases the diameter of the axially forward end of the outer tube 233, and the taper shape of the bulging portion 235 of the knob 230 is increased. The chamfered portion rides on the axially rear end of the sleeve portion 212. Thereafter, when the female screw portion 230 s of the knob 230 is further screwed, the bulging portion 235 engages with the notch 216 of the sleeve portion 212. Thereby, the axially forward end of the outer cylinder 233 returns to the state before diameter expansion. The position of the piston guide 240 at this time is the predetermined position.

  Instead of engaging the bulging part 235 of the outer cylinder 233 and the notch 216 of the sleeve part 212 by moving the knob 230 relative to the sleeve part 212 by screwing the female thread part 230s of the knob 230, By simply pushing the knob 230 in the axial direction with respect to the sleeve portion 212, the knob 230 is moved relative to the sleeve portion 212 to engage the bulging portion 235 of the outer cylinder 233 and the notch 216 of the sleeve portion 212. You may let them.

  Next, the cylindrical cover 250 is fitted to the end of the outer cylinder 233. At this time, the protrusion 236 of the outer cylinder 233 engages with the recess of the cover 250.

  In the ink inhaler 200 of the present embodiment as described above, the notch 216 formed in the sleeve portion 212 of the ink tank 210 and the bulging portion 235 formed in a part of the outer cylinder 233 include the notch 234. While the end portion of the outer cylinder 233 is engaged by temporarily expanding the diameter due to the presence, a cylindrical cover 250 is fitted to the end portion of the outer cylinder 233, and the cover 250 is connected to the outer cylinder 233. This effectively prevents the end of the diameter from expanding. By adopting such a configuration, the length of the cover 250 in the axial direction is significantly reduced as compared with the conventional case. As a result, the exposed area of the sleeve portion 212 is greatly enlarged, and when removing the ink inhaler 200 of the present embodiment from the main body of the fountain pen or the like in order to perform maintenance (cleaning) of the fountain pen or change the ink color, etc. The user is urged to grip the sleeve portion 212 instead of the knob 230 and the cover 250 and pull it out rearward in the axial direction.

  Further, according to the present embodiment, the concave stripe provided on the inner peripheral surface of the cover 250 engages with the protrusion 236 of the outer cylinder 233 and is fitted to the front of the outer cylinder 233 in the axial direction. For this reason, the position of the cover 250 can be easily held at a predetermined position at the end of the outer cylinder 233.

  Further, in the present embodiment, as in the ink inhaler 100 of the first embodiment, the high friction portion 213 (see FIG. 9) is provided on the outer surface of the sleeve portion 212 in the axial direction with respect to the cover 250. Is provided. For this reason, the user can easily pull out the ink inhaler 200 from the main body by easily grasping the high friction portion 213 of the sleeve portion 212. The high friction portion 213 of the present embodiment is configured as a ridge 214 that extends over at least a portion of the sleeve portion 212 in the circumferential direction. For this reason, the high friction part 213 can be easily formed at low cost.

  In addition, the ink tank 210 of the present embodiment is made of a transparent resin, like the ink inhaler 100 of the first embodiment. For this reason, the visibility of the ink tank 210 from the outside is remarkably improved in combination with the greatly expanded exposed area of the sleeve portion 212. This is excellent in design and meets the needs of users.

DESCRIPTION OF SYMBOLS 10 Ink tank 11 Cylindrical part 11c Ink accommodating part 11t Taper transition part 12 Sleeve part 13 High friction part 14 Projection 15 Projection part 16a Upper notch 16b Lower notch 17 Groove part 18 Notches 19a and 19b Raised part 20 Piston 21 Rod 22 Flange part 23 Guided part 23s Male thread part 24 Overhang part 30 Knob 30s Female thread part 31 Swelling part 40 Piston guide 41 Guide part 42 Leg part 42e Leg end part 43 Projection 50 Cover 51 Concave 100 First Ink inhaler 200 according to the embodiment Ink inhaler 210 according to the second embodiment Ink tank 211 Cylindrical portion 211c Ink storage portion 212 Sleeve portion 213 High friction portion 214 Projection 216 Notch 220 Piston 221 Rod 222 Flange portion 223 Guided portion 223 s Male screw portion 230 Knob 232 Cylinder 233 outer tube 234 cut 235 bulged portion 236 protruding 240 piston guide 250 covers

Claims (8)

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 knob connected to the inner side of the ink tank so as to be rotatable relative to the ink tank at the rear side in the axial direction of the ink tank;
With
A male screw portion is formed on at least a part of the side surface of the rod,
At least the front region of the knob is a hollow cylinder having a female screw part,
The male threaded portion of the rod and the female threaded portion of the knob are screwed together,
At the rear of the ink tank in the axial direction, an engaging portion is formed in at least a part of the circumferential direction,
An engaged portion that is rotatably engaged with the engaging portion is formed in at least a part of the axial direction of the knob,
The end of the ink tank is provided with a cut and can be expanded in diameter,
The engaging portion and the engaged portion are adapted to be engaged by temporarily expanding the diameter of the end portion of the ink tank,
An ink inhaler for a writing instrument, wherein a cylindrical cover is fitted behind the ink tank in the axial direction. The ink inhaler according to claim 1, wherein the cover has an axial length of 10 mm or less. 3. The ink inhaler according to claim 1, wherein a high friction portion is provided on at least a part of a side surface in the axial direction of the ink tank with respect to the cover. 4. The ink inhaler according to claim 3, wherein the high friction portion is configured as a protrusion extending over at least a part of a circumferential direction of the ink tank. The ink inhaler according to claim 1, wherein the ink tank is made of a transparent resin. At least a part of the cover in the axial direction is provided with a second engaging portion in at least a part of the circumferential direction,
At least a part of the ink tank in the axial direction is provided with a second engaged portion in at least a part of the circumferential direction,
6. The cover according to claim 1, wherein the second engaging portion and the second engaged portion are engaged with each other, and the cover is fitted to an end portion of the ink tank. Ink inhaler. 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 knob connected to the ink tank so as to be rotatable with respect to the ink tank at an axial rear side of the ink tank;
With
A male screw part is formed on at least a part of the side surface of the rod of the piston, and at least a front region of the knob is a double cylinder having an inner cylinder and an outer cylinder having a female screw part. ,
The male threaded portion of the rod and the female threaded portion of the knob are screwed together,
At the rear of the ink tank in the axial direction, an engaging portion is formed in at least a part of the circumferential direction,
An engaged portion that is rotatably engaged with the engaging portion is formed in at least a part of the axial direction of the knob,
The end of the outer cylinder of the knob is provided with a cut and can be expanded in diameter,
The engaging portion and the engaged portion are adapted to be engaged by temporarily expanding the end of the outer cylinder of the knob,
An ink inhaler for a writing instrument, wherein a cylindrical cover is fitted in front of the outer cylinder of the knob in the axial direction. At least a part of the cover in the axial direction is provided with a second engaging portion in at least a part of the circumferential direction,
At least a part of the outer cylinder of the knob is provided with a second engaged portion in at least a part of the circumferential direction,
8. The ink according to claim 7 , wherein the cover is fitted in an axially forward direction of the outer cylinder of the knob with the second engagement portion and the second engaged portion engaged. Inhaler.

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