JP2010149379A - Ink suction type fountain pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink suction type fountain pen depositing hardly an air bubble 30a coming out from an air groove 5d onto an inner face of a pen core-attaching hole 4a, when the air bubble 30a advances from a rear end part of a pen core 5 to a rear end of the pen core-attaching hole 4a, even when the pen core is positioned in a deep side of the pen core-attaching hole 4a. <P>SOLUTION: Several ribs 4f formed along an axis from the rear end part of the pen core 5 to the rear end of the pen core-attaching hole 4a are provided radially on an inner face of an opening recess 4b formed to be opened in a rear side of an rear end of the pen core 5 in the pen core-attaching hole 4a, and a front abutting part 12 provided in a front end part of the center core 9 is formed of an elastic material, an outer face of the front abutting part 12 is deformed thereby along a rib shape of the pen core-attaching hole 4a, when bringing the front abutting part 12 into contact with the inner face of the pen core-attaching hole 4a, an outer face of the front abutting part 12 is brought into contact with the inner face of the opening recess 4b of the pen core-attaching hole 4a, and an ink tank 3a is sealed thereby. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fountain pen equipped with an ink tank in a shaft cylinder, and more specifically, by moving a moving valve attached to the center of the ink tank forward, the ink tank is made negative pressure and ink is sucked from the pen core. It relates to an ink inhalation type fountain pen.

  Conventionally, in a fountain pen with a large ink tank having an ink tank formed in a shaft cylinder, such as a fountain pen described in Japanese Patent Laid-Open No. 2001-347786, a structure that blocks the ink tank and the pen core has been regarded as important. ing. The reason for this is that if the volume of the ink tank is large, the amount of air inside increases, and the amount of air expansion in the ink tank that changes as the temperature rises or the air pressure decreases increases. This is because the expanded air in the ink tank may push out the ink and cause ink leakage.

  Therefore, in the fountain pen described in Japanese Patent Application Laid-Open No. 2001-347786, when not in use, the inner core in the ink tank is advanced and the front abutting portion provided at the front end of the inner core is arranged in front of the shaft cylinder. By contacting the hole, the air groove or ink groove of the pen core communicating with the outside and the ink tank are blocked to prevent ink leakage. In addition, when writing, the center core is slightly retracted, and the front contact portion is separated from the pen core and the pen core mounting hole so that ink can flow into the pen core. The contact part and the moving valve are in a state close to the pen core.

In addition, in the ink suction type fountain pen as described above, the front abutting portion at the front portion of the center core is often formed in a tapered shape so that bubbles generated from the air groove of the pen core are difficult to adhere. . In this case, by placing the rear end of the pen core into the pen core mounting hole, the front contact portion provided on the center core is in contact with the pen core mounting hole. The front end portion of the abutting portion is configured to be immersed in the core mounting hole. However, although it is difficult for air bubbles to adhere to the front end of the front abutting portion, the air bubbles coming out of the air groove are at the rear end of the pen core because the pen core is in a position behind the pen core mounting hole. As it progresses from the head to the rear end of the pen core mounting hole, it tends to adhere to the inner surface of the pen core mounting hole, and bubbles gradually adhere to the inner surface of the pen core mounting hole and grow larger without going to the rear of the ink tank. As a result, the outflow of ink was hindered and writing could be hindered. The reason why air bubbles are likely to adhere to the inner surface of the pen core mounting hole is that the member having the pen core mounting hole is generally resin-molded. This is because the bubbles in the pen core mounting hole are attracted to and adhered to the inner surface of the resin pen core mounting hole. Since the bubbles attached in this manner were familiar with the inner surface of the pen core mounting hole, the bubbles were not easily separated by vibration caused by writing, and the bubbles were largely accumulated by continuous writing.
"JP 2001-347786 A"

  In view of these problems, the present invention takes into account the bubbles that have emerged from the air groove from the rear end of the pen core to the rear end of the pen core mounting hole even when the pen core is at a position deeper than the pen core mounting hole. The purpose of the present invention is to provide an ink inhalation type fountain pen having a structure that does not easily adhere to the inner surface of the pen core mounting hole.

The present invention
“1. An ink tank having a pen core mounting hole in which a pen core is arranged, a large-diameter space portion connected to the pen-core mounting hole, and a small-diameter space portion provided behind the large-diameter space portion. An inner core provided in the ink tank and slidably fitted into a center core holding hole provided in a holding portion for sealing the rear portion of the ink tank is disposed in the ink tank, and the front end portion of the center core is tapered. A front contact portion having a shape is provided, and by moving the center core forward, the front contact portion is brought into contact with the inner surface of the pen core mounting hole so that the ink tank can be sealed, and the front contact An outer peripheral portion that is in close contact with the inner surface of the small-diameter space portion of the ink tank and has a gap with the large-diameter portion of the ink tank, and a fluid flow passage through which the fluid passes by loosely fitting the core. With the movement valve that has, with the movement of the core to the front, behind the movement valve Providing a rear abutting portion that abuts the moving valve and restricts the rearward movement of the moving valve and blocks the fluid flow path, and moves the moving valve forward from a state in the small-diameter space portion of the ink tank. By blocking the fluid flow passage of the moving valve at the rear contact portion, the small-diameter space portion is brought into a negative pressure state, and further, the moving valve is advanced to the large-diameter space portion of the ink tank, whereby the negative pressure state is obtained. An ink having a structure in which a small-diameter space portion of the ink tank and the pen core are communicated with each other through a gap between an outer peripheral portion of the moving valve and an inner surface of the large-diameter space portion of the ink tank, and ink is sucked into the ink tank. In an inhalation type fountain pen, an axis from the rear end of the pen core to the rear end of the pen core mounting hole is formed on the inner surface of the opening recess formed to open rearward from the rear end of the pen core in the pen core mounting hole. Along the heart A plurality of the formed ribs are provided radially, and the front contact portion provided at the front end portion of the center core is formed of an elastic material so that the front contact portion is in contact with the inner surface of the pen core mounting hole. The outer surface of the front abutting portion is deformed along the rib shape of the pen core mounting hole, and the outer surface of the front abutting portion and the inner surface of the opening recess of the pen core mounting hole are brought into close contact with each other. Ink inhalation type fountain pen characterized by sealing the tank.
2. In the opening recess of the pen core mounting hole, a rectilinear portion and an enlarged diameter portion connected to the pen core are formed by connecting at a connecting portion serving as a corner, and the front contact portion is mounted on the pen core. 2. The ink inhalation type fountain pen according to claim 1, wherein the outer surface of the front contact portion is brought into contact with the connecting portion of the opening recess when the contact is made with the opening recess of the hole. Is.

  The front abutting portion provided at the front end portion of the center core may be formed of an elastic material made of rubber, elastomer, synthetic resin, etc., and its elasticity is the shape of the rib provided in the pen core mounting hole to be abutted and the high height. Depending on the thickness, it may be softened or hardened or selected as appropriate. The number of ribs provided radially in the enlarged diameter portion of the pen core mounting hole may be set according to the diameter of the expanded diameter portion, but the ribs are arranged at least at the position where bubbles generated from the air groove of the pen core pass. It is important to set the status to be performed. In addition, by forming the tip shape of the rib on an arc surface or a tapered surface, the outer surface of the front contact portion, which is an elastic material, is the outer shape of the rib when the front contact portion is contacted with the pen core mounting hole. It is possible to improve the close contact state between the front contact part and the enlarged diameter part.

  The ink inhalation type fountain pen of the present invention strengthens the ink by the capillary force generated at the base of the rib formed in the opening recess in the pen core mounting hole, even if the inner surface of the pen core mounting hole is made of resin with poor ink wettability. Since it is sucked and held, the ink held at the base of the rib is interposed between the bubble and the opening recess to prevent the bubble from sticking to the inner surface of the opening recess and the bubble smoothly flows behind the ink tank. It became possible to perform continuous writing without interruption of ink outflow. Also, from the state where the pen tip of the fountain pen is directed upward, that is, the state where the ink is accumulated on the rear end side of the small-diameter space portion of the ink tank, the pen tip is directed downward by inverting the shaft cylinder for writing. In some cases, the capillary force of the rib formed in the pen core mounting hole can smoothly move the ink in the small-diameter space portion of the ink tank to the pen core.

  Further, in the invention according to item 2, since the above-mentioned effect is achieved, the front contact portion provided at the front end portion of the core and the connecting portion which is a corner portion of the opening recess are in line contact with each other. Since the force required to press the pen core against the pen core mounting hole is small, operability is good, and a part of the front abutting part contacts a part of the rib formed long along the axis in the front-rear direction. Therefore, the elastic deformation of the front contact portion along the rib shape is easily performed, and the application range of the material of the front contact portion can be widened.

  Even if the inner surface of the pen core mounting hole is made of a resin with poor ink wettability, the ink is strongly sucked and held by the capillary force generated at the base of the rib formed in the opening recess of the pen core mounting hole. Using the property of air with poor wettability, the ink is held away from the ink by the ink held at the base of the ribs, preventing the bubbles from sticking to the inner surface of the pen core mounting hole, and the outflow of ink An ink inhalation fountain pen that can be continuously written without interruption is realized.

  Next, the present embodiment will be described with reference to the drawings. In the description of the present embodiment, the direction of the pen tip is expressed as front, and the opposite side is expressed as rear. Further, the side where the pen tip is located is expressed as the upper side with respect to the axial center of the shaft cylinder, and the opposite side is expressed as the lower side. The same members and the same parts in the drawings are denoted by the same reference numerals. In addition, this invention is not limited to a following example.

  FIG. 1 is a longitudinal sectional view of the fountain pen of this embodiment, and FIG. 2 is an enlarged view of a main part of FIG. In the fountain pen 1, a shaft cylinder 2 is composed of a shaft cylinder main body 3 and a neck member 4, and a pen core mounting hole 4a for mounting the pen core 5 is integrally formed with the resin inside the neck member 4. The pen core 5 includes a pen core body 5a and an inner core 5b disposed in a penetrating hole formed in the pen core body 5a, and the pen tip 6 is sandwiched between the side surface of the pen core body 5a and the inner surface of the neck member 4. It is. The pen core body 5a is formed with an ink groove 5c for flowing in and out, and an air groove 5d through which air passes is formed in a gap between the pen core body 5a and the inner core 5b. As shown in detail in FIG. 2, the pen core mounting hole 4 a in which the pen core 5 is mounted is provided with an opening concave portion 4 b opened rearward from the rear end of the pen core 5, and the pen core 5 is provided in the opening concave portion 4 b. The rectilinear portion 4c and the enlarged diameter portion 4e that are connected to each other are connected by a connecting portion 4d that is a corner portion. Further, a plurality of radial ribs 4f formed along the axial center to the rear end of the pen core mounting hole 4a are provided on the inner surface of the opening recess 4b. FIG. 3 is a view of the pen core mounting hole 4a and the pen core 5 as viewed from the position of line AA in FIG.

  Further, as shown in FIG. 1, a pen core mounting hole 4a and a large-diameter space portion 3b of an ink tank 3a provided in the shaft cylinder main body 3 are connected to each other, and a small-diameter space portion is provided behind the large-diameter space portion 3b. 3c is continuously provided. A holding member 7 that seals the ink tank 3a is screwed to the rear portion of the small-diameter space portion 3c, and an O-ring 8 is disposed in the center core holding hole 7a formed in the holding member 7, so that the ink tank 3a. The inner core 9 disposed inside is slidably fitted. Further, a male screw portion 9 a is formed at the rear end portion of the core 9, and the male screw portion 9 a is screwed with a female screw portion 10 a formed on the tail crown 10, so that the tail crown 10 is moved back and forth. The inner core 9 in the ink tank 3a can be driven. A female screw portion 10 b is formed on the inner surface of the front end of the tail crown 10, and can be screwed with a male screw portion 7 b formed on the outer surface of the rear end of the holding member 7.

Further, as shown in detail in FIG. 2, a male screw portion 9b is formed at the tip of the middle core 9, and the female screw portion of the tip member 11 disposed at the front end of the middle core 9 with respect to the male screw portion 9b. 11a is screwed, and the bulging portion 12b formed on the through hole 12a side of the front contact body 12 formed of urethane, which is an elastic material, is engaged with the engagement groove 11b formed in the front portion of the tip member 11. Fixed. In the present embodiment, a plurality of radial protrusions 11 d are formed on the side surface of the tip member 11, and the tip member 11 is inserted into the fluid flow passage 13 a penetrating the front and rear formed in the transfer valve 13 and the front of the transfer valve 13. The movement to is restricted by the protrusion 11d. A conical portion 11c is formed at the tip of the tip member 11, and the conical portion 11c and the surface of the front abutting body 12 are integrally continuous.
Further, the rear abutting body 14 having the rear abutting portion 14a inserts the male screw portion 9b of the core 9 into the through hole 14b, and between the rear end portion of the front member 11 and the core main body 9c. The rearward movement of the moving valve 13 is restricted by the rear abutting portion 14 a of the rear abutting body 14. Therefore, the moving valve 13 can be moved back and forth between the protrusion 11d of the tip member 11 and the rear contact portion 14a of the rear contact body 14.
The state shown in FIGS. 1 and 2 is a connecting portion in which the front contact body 14 is a corner portion of the pen core mounting hole 4a even when ink (not shown) is accommodated in the ink tank 3a. Since the front abutting body 14 is made of an elastic material in contact with 4d, it is deformed into the shape of a rib 4f formed inside the opening recess 4b, and the inside of the ink tank 3a is blocked from the outside to prevent ink leakage. It has become a state.

  Next, with reference to FIG. 4 and FIG. 5, a brief explanation will be given when ink is sucked into the ink tank. 4 is a cross-sectional view showing a state in which the tail crown is pulled, and FIG. 5 is a cross-sectional view of the main part of FIG. As shown in FIG. 4, when the tail cap 10 is unscrewed from the holding member 7 and pulled backward, the inner core 9 is moved backward to move the moving valve 13 to the small diameter space 3c of the ink tank 3a. As shown, the outer peripheral portion 13d of the moving valve 13 is in close contact with the inner surface of the small-diameter space portion 3c, and the protruding portion 13b formed inside the fluid passage 13a of the moving valve 13 is in contact with the protruding portion 11d of the tip member 11. Retreat with. At this time, the rear end portion 13c of the moving valve 13 is separated from the rear abutting portion 14a of the rear abutting body 14, and the air in the small-diameter space portion 3c that has been emptied of ink is arranged in a plurality of radial directions. Since the fluid passage 13a passes between the protruding portions 11d, the movement valve 13 can be moved back to the rear end of the ink tank 3a without changing the pressure in the ink tank 3a.

  FIG. 6 is a view showing a state where the pen core is put into the ink of the ink bottle and the tail cap is pushed, and FIG. 7 is a cross-sectional view of the main part of FIG. FIG. 8 shows a state in which the tail crown is further advanced from the state of FIG. As shown in FIG. 6, by moving the tail cap 10 forward, the rear end portion 13c of the moving valve 13 that is in close contact with the inner surface of the small-diameter space portion 3c of the ink tank 3a contacts the rear contact portion 14a of the rear contact body 14. In contact therewith, the fluid flow passage 13a of the transfer valve 13 is blocked, and the small-diameter space 3c in the airtight state is brought into a negative pressure state. As shown in FIG. 8 from this state, by further moving the moving valve 13 to the large diameter space portion 3b, the outer peripheral portion 13d of the moving valve 13 is separated from the inner surface of the large diameter space portion 3b, thereby creating a gap. 6 is a structure in which the ink 20 of the ink bottle 200 shown in FIG. 6 is sucked from the pen core 5 and sucked toward the small-diameter space portion 3c in a negative pressure state (see FIG. 8).

  Next, the inside of the ink tank at the time of writing with the fountain pen of the present embodiment will be described. FIG. 9 is a cross-sectional view of a main part in a state where writing is performed. In the writing state, the ink 20 in the ink tank 3 a flows out from the ink groove 5 c of the pen core 5, and the air 30 enters the air groove 5 d by the discharge amount 20 a of the ink 20. Therefore, as shown in FIG. 9, the air entering from the air groove 5d becomes a bubble 30a, and moves backward while passing through the upper part of the ink tank 3a by buoyancy. In the present embodiment, the plurality of ribs 4f formed on the inner surface of the opening recess 4b allowed the bubbles 30a to advance backward while passing through the upper portion of the ink tank 3a without adhering to the inner surface of the opening recess 4b. FIG. 10 shows details of the opening recess of this embodiment, and schematically shows the relationship between the opening recess 4b and the bubble 30a in cross section. Since the ink 20b strongly attracted by the capillary force of the rib 4f is interposed between the opening recess 4b and the bubble 30a, the bubble 30a is prevented from sticking to the opening recess 4b. It did not adhere to.

  Next, as a comparative example, the inside of the ink tank at the time of writing in a suction type fountain pen having a conventional structure will be described. FIG. 11 is a cross-sectional view of the main part of a conventional fountain pen. A difference from the above-described embodiment is that no rib is formed on the inner surface of the opening recess 4b. As shown in FIG. 11, in the comparative example, bubbles 30a generated from the air groove 5d adhere to the inner surface of the opening recess 4b formed by resin molding, and the connecting portion 4d of the opening recess 4b having a narrow gap, the conical portion 11c of the tip member, and the front Bubbles 30a are accumulated between the contact body 12 and the state as shown in FIG. 12 is obtained by continuous writing, and the ink 20 in the ink tank 3a is isolated from the pen core 5 to prevent the ink 20 from flowing out. Oops.

  In the present invention, besides a fountain pen nib, a plurality of thin plate materials are overlapped to form a minute gap-like ink flow path from the front end portion to the rear end portion as shown in JP-A-8-52977. The present invention can also be applied to a writing instrument having a nib formed in this way.

It is a longitudinal cross-sectional view of the fountain pen of a present Example. It is a principal part enlarged view of FIG. It is the figure of the state which looked at the pen core installation hole and the pen core from the position of the AA line of FIG. It is sectional drawing of the state which has pulled the tail crown. It is principal part sectional drawing of FIG. It is a figure of the state which puts a pen core into the ink of an ink bottle and is pushing a tail cap. It is principal part sectional drawing of FIG. It is the state which advanced the tail crown further from the state of FIG. It is principal part sectional drawing of the state which is writing. The detail of the opening recessed part of a present Example is shown. It is principal part sectional drawing in the fountain pen of the conventional structure. It is principal part sectional drawing of the state which is writing continuously with the fountain pen of the conventional structure.

Explanation of symbols

1 ... fountain pen, 2 ... shaft,
3 ... Shaft cylinder body, 3a ... Ink tank, 3b ... Large diameter space part, 3c ... Small diameter space part,
4 ... Neck member, 4a ... Pen core mounting hole, 4b ... Opening recess, 4c ... Straight running part,
4d ... articulated part, 4e ... enlarged diameter part, 4f ... rib,
5 ... pen core, 5a ... pen core body, 5b ... inner core, 5c ... ink groove, 5d ... air groove,
6 ... nib,
7 ... Holding member, 7a ... Core holding hole, 7b ... Male screw part,
8 ... O-ring,
9 ... center core, 9a ... male screw part, 9b ... male screw part, 9c ... core main body,
10 ... Tail crown, 10a ... Female screw part, 10b ... Female screw part,
DESCRIPTION OF SYMBOLS 11 ... Tip member, 11a ... Female screw part, 11b ... Engagement groove, 11c ... Conical part,
11d: protrusion,
12 ... Front contact body, 12a ... Through hole, 12b ... Swelling part,
13 ... Moving valve, 13a ... Fluid flow passage, 13b ... Projection, 13c ... Rear end,
13d ... outer periphery,
14 ... Back contact body, 14a ... Back contact part, 14b ... Through-hole,
200: Ink bottle,
20 ... Ink, 20a ... Discharged part, 20b ... Ink attracted strongly by the capillary force of the rib,
30 ... Air, 30a ... Bubble.

Claims (2)

  An ink tank having a pen core mounting hole in which a pen core is arranged, a large diameter space portion connected to the pen core mounting hole, and a small diameter space portion provided behind the large diameter space portion is provided in the shaft cylinder. In the ink tank, a central core slidably fitted into a central core holding hole provided in a holding portion for sealing the rear portion of the ink tank is disposed, and a tapered front is disposed at the front end portion of the central core. An abutting portion is provided, and by moving the central core forward, the ink tank can be sealed by bringing the front abutting portion into contact with the inner surface of the pen core mounting hole, and behind the front abutting portion. And an outer peripheral portion that is in close contact with the inner surface of the small-diameter space portion of the ink tank and that forms a gap with the large-diameter portion of the ink tank, and a fluid flow passage that allows the fluid to pass through by loosely fitting the core. A valve is provided at the rear of the moving valve, and the movement of the core along with the forward movement A rear abutting portion that restricts the movement of the moving valve to the rear and shuts off the fluid flow path, and advances the moving valve from a state in the small-diameter space portion of the ink tank, By blocking the fluid flow passage of the transfer valve at the rear abutting portion to make the small diameter space portion into a negative pressure state, and further moving the transfer valve forward to the large diameter space portion of the ink tank, the negative pressure state is reached. An ink suction type having a structure in which the small diameter space portion of the ink tank and the pen core are communicated with each other through a gap between the outer peripheral portion of the moving valve and the inner surface of the large diameter space portion of the ink tank, and the ink is sucked into the ink tank. In the fountain pen, on the inner surface of the opening recess formed so as to open rearward from the rear end of the pen core in the pen core mounting hole, from the rear end of the pen core to the rear end of the pen core mounting hole. Formed along When a plurality of ribs are provided radially and a front contact portion provided at the front end portion of the center core is formed of an elastic material, the front contact portion is brought into contact with the inner surface of the pen core mounting hole. The outer surface of the front abutting portion is deformed along the rib shape of the pen core mounting hole, and the outer surface of the front abutting portion and the inner surface of the opening recess of the pen core mounting hole are closely contacted to form the ink tank. Ink inhalation type fountain pen characterized by sealing.   In the opening recess of the pen core mounting hole, a rectilinear portion and an enlarged diameter portion connected to the pen core are formed by connecting at a connecting portion serving as a corner, and the front contact portion is mounted on the pen core. 2. The ink inhalation type fountain pen according to claim 1, wherein the outer surface of the front contact portion is brought into contact with the connecting portion of the opening recess when the contact is made with the opening recess of the hole.

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