JP2010099928A - Ink suction-type fountain pen - Google Patents

Abstract

To provide an ink inhalation type fountain pen having a structure in which writing can be performed immediately when writing is performed with the nib 6 facing upward from the nib 6 facing upward.
A piece member in which a sliding hole 11a penetrating in the front-rear direction along the axis is provided and a thick part 11b and a thin part 11c having different thicknesses from the sliding hole 11a to the outer surface are provided at a target position. 11 is inserted in the sliding hole 11a of the piece member 11 so as to be slidable only with respect to the core 9 in the ink tank 3a, and the piece member 11 is moved back and forth by the inclination of the shaft cylinder 2. When the shaft cylinder 2 is tilted, the thick portion 11b of the piece member 11 is positioned below the ink tank 3a by weight and the thin portion 11c is positioned upward.
[Selection] Figure 8

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 that is contained increases, and the amount of expansion of the air in the ink tank that changes as the air temperature increases 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.

  As described in JP 2001-347786 A, such a fountain pen advances the inner core in the ink tank when not in use, and the front abutting portion provided at the tip of the inner core has a shaft cylinder. By contacting the pen core or pen core mounting hole disposed in front, the air groove or ink groove of the pen core communicating with the outside and the ink tank are blocked to prevent ink leakage. Therefore, at the time of writing, the inner 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.

  Further, behind the front abutting portion, a fluid is obtained by loosely fitting an outer peripheral portion formed in close contact with the inner surface of the small-diameter space portion of the ink tank and forming a gap with the large-diameter portion of the ink tank, and a core. A moving valve having a fluid flow passage that passes therethrough is disposed, and the moving valve is in contact with the moving valve at the rear side of the moving valve to restrict the movement of the moving valve to the rear side as the core moves forward. In addition, a rear abutting portion for blocking the fluid flow path is provided. By moving the transfer valve forward from the small diameter space portion of the ink tank, the fluid flow path of the transfer valve is blocked by the rear abutting portion to make the small diameter space portion in a negative pressure state. By moving forward to the large-diameter space of the tank, the small-diameter space of the ink tank under negative pressure 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 of the ink tank. The ink is sucked into the ink tank.

By the way, the ink suction fountain pen described above is generally made of rubber or elastomer, so that the inner surface of the small-diameter space portion is lubricated to reduce the contact resistance in the small-diameter space portion of the ink tank. Grease is applied as an agent. Also, grease is applied to the center core in order to reduce the contact resistance with the center core holding hole provided in the holding portion for holding the center core. Therefore, the wettability with the ink deteriorates due to the hydrophobicity of the grease.For example, even if the pen tip is directed downward for writing from the state where the pen tip is directed upward, the ink accumulated in the small-diameter space portion is not removed from the surface of the ink. There has been a problem that due to the tension, the ink stays in the small-diameter space portion and does not flow into the large-diameter space portion, ink does not flow into the pen core, and writing cannot be performed immediately. This phenomenon tends to occur particularly when the remaining amount of ink in the ink tank is small and light, or when the surface tension of the ink is high.
"JP 2001-347786 A"

  In view of these problems, the present invention provides an ink inhalation type fountain pen having a structure in which writing can be performed immediately when writing is performed with the nib pointing downward from a state where the nib is facing upward. The purpose is to do.

The present invention
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 connected to the rear of the large diameter space portion is provided in the shaft cylinder. An inner core that is slidably fitted into the inner core holding hole provided in the holding portion that seals the rear portion of the ink tank is disposed in the ink tank, and the inner core is disposed in front of the inner core. A front abutting portion having a diameter larger than the outer diameter and smaller than the inner diameter of the ink tank is provided, and by moving the center core forward, the front abutting portion is brought into contact with the pen core and / or pen core mounting hole. The ink tank can be hermetically sealed by contact, 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 has a gap with the large-diameter portion of the ink tank, behind the front abutting portion; A moving valve having a fluid flow path through which the fluid passes by loosely fitting the core is provided. A rear abutting portion is provided on the rear side of the moving valve so as to abut against the moving valve in accordance with the forward movement of the core and restrict the movement of the moving valve to the rear and block the fluid flow passage; The moving valve is moved forward from a state in the small-diameter space portion of the ink tank, so that the fluid flow passage of the moving valve is blocked by the rear abutting portion so that the small-diameter space portion is in a negative pressure state. Is moved forward to the large-diameter space portion of the ink tank, whereby the small-diameter space portion of the ink tank and the pen core in a negative pressure state are moved to the outer peripheral portion of the moving valve and the inner surface of the large-diameter space portion of the ink tank. In the ink suction fountain pen with a structure for sucking ink into the ink tank, a sliding hole penetrating in the front-rear direction along the axis is provided and the thickness from the sliding hole to the outer surface Different thickness and thickness Is inserted in the sliding hole of the piece member so that the core member is slidable only with respect to the core member in the previous ink tank. When the piece member is moved back and forth by tilting and the shaft tube is inclined, the thick part of the piece member is positioned below the ink tank by weight and the thin part is located above. Ink inhalation fountain pen. "

  The piece member in the present invention has a large cross-sectional area in the transverse direction perpendicular to the axis of the shaft cylinder in the small-diameter space portion, and the material is made of a material having a large specific gravity such as metal, so that the effect of moving the ink is increased. preferable. The outer shape may be a circular shape, an egg shape, an elliptical shape, or a polygonal shape in the cross section. The sliding hole provided in the piece member can be formed so as to be shifted with respect to the center of the piece member, thereby forming a thick part and a thin part in which the thickness from the sliding hole to the outer surface is the target positional relationship. . In the present invention, when the shaft tube is tilted, the thick wall portion of the piece member is positioned below the ink tank, and the light thin wall portion is positioned above the ink tank. It is important. In addition, the thick part of the piece member must be set to a size that does not contact the inner surface of the small-diameter space part of the ink tank, and the thin-walled part of the piece member is a bubble that passes above the small-diameter space part of the ink tank from the pen core. It is necessary to set the dimension so that it does not touch.

  In the present invention, when the pen tip of the fountain pen is directed upward, that is, when the ink has accumulated on the rear end side of the small-diameter space portion of the ink tank, the piece member attached to the center core is similarly disposed behind the small-diameter space portion. When the shaft tube is reversed and the pen tip is directed downward for writing, the piece member moves forward, and at the same time, the ink accumulated in the small-diameter space is forcibly forced into the ink tank. It was moved to the large-diameter space and the ink was allowed to flow into the pen core so that writing could be performed immediately.

  We realized a fountain pen with a structure that allows you to write immediately from the state where the pen tip is directed upward to the state where the pen tip is directed downward.

  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 in the longitudinal direction 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. Further, in the cross-sectional view for explaining the present embodiment, there is a drawing description in a state where the cross-sectional view and the outline drawing are combined in order to make the contents easy to understand. 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 the end surface taken along line AA of FIG. In the fountain pen 1, the shaft cylinder 2 includes a shaft cylinder body 3 and a neck member 4, and a pen core mounting hole 4 a for mounting the pen core 5 is provided 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.

  Further, a taper portion 4b that increases in diameter toward the rear is provided at the rear end portion of the pen core mounting hole 4a of the neck member 4, and the large-diameter space portion 3b of the ink tank 3a provided in the shaft cylinder main body 3 is provided. The small-diameter space portion 3c is continuously provided behind the large-diameter space portion 3b. 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, and the ink tank 3a is disposed inside the ink tank 3a. The arranged core 9 is slidably fitted. Further, a male screw portion 9a is formed at the rear end portion of the center core 9, and the male screw portion 9a is screwed into a female screw portion 10a 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, a stainless steel piece member 11 is disposed on the outer periphery of the core 9, and the core 9 is loosely fitted in a sliding hole 11 a drilled in the piece member 11. The piece member 11 has a circular outer shape, and the sliding hole 11a is perforated at a position shifted from the center of the circle. The left side in the drawing is the thick portion 11b, and the right side in the drawing is the thin portion. 11c (see FIG. 2). Therefore, when the shaft cylinder 2 is tilted sideways, the thick portion 11b of the piece member 11 is positioned below the ink tank 3a due to its weight. Further, a front abutting body 14 having a conical front abutting portion 14a that abuts on the tapered portion 4b of the pen core mounting hole 4a described above is screwed to the distal end portion of the center core 9 (FIG. 4). Reference), a moving valve 15 is arranged behind the front abutting body 14 so as to be movable back and forth, and a rear abutting body 16 having a rear abutting portion 16 a is provided behind the moving valve 15. In this embodiment, grease (not shown) is applied to the inner peripheral surface of the small-diameter space portion 3c of the ink tank 3a and the outer peripheral surface of the core 9 so that the sliding property between the moving valve 15 and the O-ring 8 is smooth. It is in a state.

  The fountain pen 1 shown in FIG. 1 has the ink 12 and the air 13 in the ink tank 3a, and the ink 12 is directed downward while the pen tip 6 is directed upward as shown in FIG. Is in a state above. Further, since the tapered portion 4b of the pen core mounting hole 4a is in contact with the conical front contact portion 14a of the front contact body 14, the ink groove 5c and the air groove 5d of the pen core 5 are formed in the ink tank. It is in a non-written state that is blocked from 3a to prevent ink leakage.

  Next, a brief description will be given when ink is sucked into the ink tank with reference to FIGS. FIG. 3 is a cross-sectional view of the state where the tail cap is being pulled, and FIG. 4 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 rearward as shown in FIG. 3, the core 9 is moved backward to move the moving valve 15 to the small diameter space 3c of the ink tank 3a. The outer peripheral portion 15d of the moving valve 15 is in close contact with the inner surface of the small-diameter space portion 3c, and the protruding portion 15b formed inside the fluid flow passage 15a of the moving valve 15 is in contact with the protruding portion 14c of the front abutting body 14. Retreat with. At this time, the rear end portion 15c of the moving valve 15 is separated from the rear abutting portion 16a of the rear abutting body 16, and the air 13 in the small diameter space portion 3c that has been emptied of ink is radiated in a plurality of radial directions. Since the fluid flow passage 15a passes through the arranged projections 15b and passes through the fluid flow passage 15a, the moving valve 15 can be moved back to the rear end of the ink tank 3a without changing the pressure in the ink tank 3a.

  5 is a diagram showing a state where the pen core is put into the ink of the ink bottle and the tail crown is pushed, FIG. 6 is a cross-sectional view of the main part of FIG. 5, and FIG. 7 is the tail crown further advanced from the state of FIG. State. As shown in FIG. 6, the rear end 15c of the moving valve 15 that is in close contact with the inner surface of the small-diameter space 3c of the ink tank 3a is Abutting on the rear abutting portion 16a, the fluid flow passage 15a of the moving valve 15 is blocked, and the airtight small-diameter space portion 3c is set in a negative pressure state. From this state, as shown in FIG. 6, the outer peripheral portion 15d of the moving valve 15 is separated from the inner surface of the large-diameter space portion 3b by further moving the moving valve 15 forward to the large-diameter space portion 3b. The ink 12 in the ink bottle 20 shown in FIG. 5 is sucked from the pen core 5 and sucked toward the small-diameter space 3c in a negative pressure state (see FIG. 7).

Next, the fountain pen of the present embodiment will be described when the writing state shown in FIG. 8 is changed from the state of the non-writing fountain pen shown in FIG. The ink 12 that was in the small-diameter space portion 3c shown in FIG. 1 moved to the large-diameter space portion 3b as the piece member 11 moved to the pen tip side as shown in FIG. Accordingly, the tail crown 10 is loosened and the front contact portion 4a is separated from the tapered portion 4b of the pen core insertion hole 4a, so that the ink 12 flows into the ink groove 5c of the pen core 5 and can be written immediately. I was able to put it in a state. On the other hand, the fountain pen 100 of Comparative Example 1 shown in FIG. 9 uses the thin portion 11c (see FIG. 2) of the piece member 11 of this embodiment instead of using the piece member 11 of the above-described embodiment for the core 9. A cylindrical piece member 110 having an equal thickness uniformly with respect to the sliding hole 110a is provided.
Unlike the piece member 11 of the previous embodiment, the piece member 110 of Comparative Example 1 has a small cross-sectional area in the lateral direction perpendicular to the axis of the shaft cylinder 2 in the small diameter space portion 3c, and the sliding hole 110a is large and light. As a result, only the piece member 110 moves downward, and the ink 12 cannot be moved from the small-diameter space portion 3c. Therefore, as shown in FIG. 9, air 13 has accumulated on the pen core 5 side of the ink tank 3a for a while, and writing could not be performed until the ink 12 gradually decreased.

  Next, the inside of the ink tank at the time of writing with the fountain pen of this embodiment will be described. FIG. 10 is a cross-sectional view of the main part in a state where writing is performed with the fountain pen of this embodiment. In the writing state, the ink 12 in the ink tank 3 a flows out from the ink groove 5 c of the pen core 5, and the air 13 enters the air groove 5 d by the discharge amount 13 a of the ink 12. Therefore, as shown in FIG. 10, the air 13 entering from the air groove 5d becomes bubbles 13a and travels backward while passing through the upper part of the ink tank 3a by buoyancy. In this embodiment, as shown in FIG. 10, since the piece member 11 has the thick portion 11b positioned below the ink tank 3a and the thin portion 11c positioned above due to its weight, A gap was formed between the inner surface and the outer surface of the piece member 11c, and the movement of the bubbles 13a toward the rear side was not hindered. On the other hand, the fountain pen 200 of the comparative example 2 shown in FIG. 11 uses the thick portion 11b of the piece member 11 of this embodiment instead of using the piece member 11 of the above-described embodiment for the core 9 (see FIG. 2). A cylindrical piece member 210 having a uniform thickness with respect to the sliding hole 210a is disposed. Since the piece member 210 of the comparative example 2 has a large cross-sectional area and a weight like the piece member 11 of the previous embodiment, it is not possible to move the ink 12 accumulated in the small diameter space portion 3c to the large diameter space portion 3b. However, as shown in FIG. 11, the upper part in the ink tank 3 a is blocked by the piece member 210, so that the air bubbles 13 a generated from the air groove 5 d of the pen core 5 stop before the piece member 210. The bubbles gradually increased with the writing, and as a result, the supply of the ink 12 to the pen core 5 was stopped, and the writing could not be performed.

  The present invention has a structure in which the piece member slides only with respect to the core, and the inner surface of the ink tank is not damaged by the piece member. Therefore, the shaft cylinder body forming the ink tank is made of a transparent resin that can be seen from the inside. Even an axis can be applied.

It is a longitudinal cross-sectional view of the fountain pen of a present Example. It is an AA line end surface enlarged view 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 sectional drawing of the writing state in the fountain pen of a present Example. It is a fountain pen of Comparative Example 1. It is principal part sectional drawing of the state currently writing with the fountain pen of a present Example. It is principal part sectional drawing of the state which is writing in with the fountain pen of the comparative example 2.

Explanation of symbols

1,100,200 ... 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 ... taper part,
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 ... Core, 9a ... Male screw part, 9b ... Male screw part,
10 ... Tail crown, 10a ... Female screw part, 10b ... Female screw part,
11, 110, 210 ... piece member, 11a, 110a, 210a ... sliding hole,
11b ... thick part, 11c ... thin part,
12 ... Ink, 12a ... Discharge amount,
13 ... Air, 13a ... Bubble,
14 ... Front contact body, 14a ... Front contact part, 14b ... Female screw part,
14c ... projection,
15 ... Movement valve, 15a ... Fluid flow passage, 15b ... Projection, 15c ... Rear end,
15d ... outer periphery,
16 ... Back contact body, 16a ... Back contact part, 16b ... Through-hole,
20: Ink bottle.

Claims (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 is provided in the shaft cylinder. In the ink tank, a core that is slidably fitted into a core holding hole provided in a holding portion that seals the rear portion of the ink tank is disposed, and the outer side of the core is disposed in front of the core. A front abutting portion having a diameter larger than the diameter and smaller than the inner diameter of the ink tank is provided, and the front abutting portion abuts on the pen core and / or pen core mounting hole by moving the center core forward. The ink tank can be sealed, 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 has a gap with the large-diameter portion of the ink tank, is disposed behind the front contact portion. Provided with a movement valve having a fluid flow path through which a fluid passes by loosely fitting a core Provided at the rear of the movement valve is a rear abutting portion that abuts the movement valve with the movement of the core forward and restricts the movement of the movement valve to the rear and blocks the fluid flow passage. By moving the transfer valve from the state in the small-diameter space portion of the ink tank, the fluid flow passage of the transfer valve is blocked by the rear abutting portion, and the small-diameter space portion is in a negative pressure state. By advancing to the large-diameter space portion of the ink tank, the small-diameter space portion of the ink tank and the pen core in a negative pressure state are connected to the outer peripheral portion of the moving valve and the inner surface of the large-diameter space portion of the ink tank. In the ink suction fountain pen having a structure for sucking ink into the ink tank, a sliding hole penetrating in the front-rear direction along the axial center is provided and the thickness from the sliding hole to the outer surface is set. Different thick and thin parts Is inserted in the sliding hole of the piece member so as to be slidable only with respect to the core member in the previous ink tank, and the inclination of the shaft cylinder The ink is characterized in that when the piece member is moved back and forth and the shaft tube is tilted, the thick part of the piece member is positioned below the ink tank by weight and the thin part is located above. Inhalation fountain pen.

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