JP6716438B2 - fountain pen - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fountain pen, and more particularly, to a fountain pen in which an ink inhaler is mounted behind a pen core to suck ink into an ink tank.

Conventionally, a fountain pen having a structure in which ink is sucked into an ink tank by operating an ink inhaler mounted behind a pen core is known.
For example, in Patent Document 1, when the sleeve that has advanced in the coating liquid storage portion (ink tank) in the barrel moves backward, negative pressure is generated in the liquid storage portion (ink tank), and the ink in the ink bottle There is described a fountain pen that sucks ink into a liquid storage section (ink tank) through a liquid storage core (pen core) immersed therein.
With such a fountain pen, when inhaling the ink, the ink in the ink bottle is inhaled by using both the ink groove and the air groove of the pen core. The structure that can store the ink is suitable for holding more ink on the fountain pen, and it is better that the ink can be stored up to the front of the pen core.

However, the capillary force of the air groove for passing air is weak, and the ink stored in the air groove in front of the pen core tends to drop due to impact and stain the paper surface. There is a need for a structure that can use the ink remaining in the air channels located in front of the.

JP, 11-235548, A

It is an object of the present invention to obtain a fountain pen that can be used for writing with ink entering an air groove located in front of a pen core at the beginning of writing after inhaling ink.

The present invention is
"A pen core having an ink groove formed on the upper side surface and an air groove extending from the front side to the rear side and a pen body adjacent to the upper side surface of the pen core are inserted into the front opening of the barrel. In the fountain pen, a connecting groove for connecting the ink groove and the air groove is formed in an intermediate portion of the pen core, and the capillary force of the connecting groove is greater than that of the air groove of the portion adjacent to the connecting groove. It is a fountain pen that is large and has a structure smaller than the ink groove in the portion adjacent to the connecting groove."

The capillary force of the connecting groove is made larger than the air groove of the portion adjacent to the connecting groove and smaller than the ink groove of the portion adjacent to the connecting groove, that is, the cross-sectional area of the connecting groove is provided adjacent to the connecting groove. By making the ink groove smaller than the air groove in the portion formed and larger than the ink groove in the portion adjacent to the connecting groove, the ink remaining in the air groove after sucking the ink flows into the connecting groove when writing is started, and then the connecting groove The ink can be made to flow into the ink groove. Therefore, the ink left in front of the air groove after inhaling ink flows to the ink groove through the connecting groove at the beginning of writing, so it is possible to prevent the ink from falling from the pen core and contaminating the paper surface due to impact. To be done.

Further, the air groove of the portion adjacent to the connecting groove is opened to the outside of the pen core, and the connecting groove and the open portion are continuous to form an air groove when the pen core is molded. Both cavities forming the ink groove and the air groove may be brought into contact with the core pin to prevent the core pin from deviating and preventing damage to the core pin. The pen core molded by such a manufacturing method has stable dimensional accuracy.

According to the fountain pen of the present invention, the ink in the air groove located in front of the pen core flows into the ink groove through the connecting groove at the beginning of writing after the ink is sucked, and is used for writing. You can

FIG. 1 is a vertical sectional view showing the fountain pen of this embodiment. FIG. 2 is an enlarged view of a main part. FIG. 3 is an end view taken along the line AA of FIG. FIG. 4 is a perspective view of the pen core, FIG. 4A is a view seen from the pen body side, and FIG. 4B is a view seen from the opposite side. 5 is a sectional perspective view of the first state in which the pen core is injection molded, FIG. 5A is a view seen from the pen body side, and FIG. 5B is a view seen from the opposite side. 6 is a sectional perspective view of a second state in which the pen core is injection molded, FIG. 6A is a view seen from the pen body side, and FIG. 6B is a view seen from the opposite side. FIG. 7 is a diagram showing a state where ink is sucked from the ink bottle. FIG. 8 is a diagram showing a state where ink is sucked from the ink bottle. FIG. 9 is an enlarged view of a main part in a state where ink is sucked. FIG. 10 is an enlarged view of a main part in a state where writing is performed.

Next, description will be given with reference to the drawings, but the present invention is not limited to the following embodiments.
The fountain pen of this embodiment will be described below with reference to the drawings. In the present embodiment, the side with the pen body is expressed as the front and the opposite side is expressed as the rear. In order to make the description easy to understand, the same members and similar parts in the drawings are denoted by the same reference numerals.

FIG. 1 is a vertical sectional view showing the fountain pen of this embodiment. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is an end view taken along the line AA of FIG. FIG. 4 is a perspective view of the pen core, FIG. 4A is a view seen from the pen body side, and FIG. 4B is a view seen from the opposite side.

The fountain pen 1 of the present embodiment comprises a barrel 2 composed of a neck member 3, a barrel body 4 and a crown 5, and a pen body 6 and a pen body 6 in a front opening 3a formed in the neck member 3. A pen core 7 having an upper surface 6 adjacent thereto is inserted. An outer cylinder portion 3b and an inner cylinder portion 3c are provided on the rear portion of the neck member 3 so that the rear portion of the pen core 7 is inserted inside the inner cylinder portion 3c, and the outer cylinder portion 3b and the inner cylinder portion 3b are inserted. The front end portion 8a of the ink suction mechanism 8 is inserted into the gap 3d with the cylindrical portion 3c.

The ink suction mechanism 8 is fitted into the ink containing cylinder 81, the valve body 82 that slides on the inner surface of the ink tank 81a formed inside the ink containing cylinder 81, and the rear opening 82a formed in the valve body 82. A push rod 83, a rotary operation portion 84 having a female screw portion 84a that engages with a male screw portion 83a formed on the outer surface of the push rod 83, and a rotation operation portion 84 that is fitted to the rear portion of the ink containing cylinder 81 and is formed in front of the rotation operation portion 84. The holding cylinder 85 holds the large diameter portion 84b in a retaining state, and the annular packing 86 sandwiched between the inner stage 85a of the holding cylinder 85 and the rear end of the ink containing cylinder 81.

The pen core 7 has an ink groove 7a extending in the front-back direction of the pen core 7 on the upper surface side adjacent to the pen body 6, and the air groove 7b extends from the front end surface 7c of the pen core 7 to the rear end surface 7d. Is formed. The air groove 7b includes a front groove 71b formed in front of the pen core 7, an intermediate groove 72b formed on a lower surface side of an intermediate portion of the pen core 7, a connecting groove 73b formed on a side surface of the pen core 7, and a pen core. 7 has a rear groove 74b formed integrally with the ink groove 7a.
The front groove 71b communicates with the intermediate groove 72b, the intermediate groove 72b communicates with the communication groove 73d, the communication groove 73b communicates with the rear groove 74b, and as the ink in the ink tank 81a decreases, air is discharged through the air groove 7b. Is designed to be taken into the ink tank 81a.

Further, the pen core 7 has a ridge 7e formed on the entire circumference except for the upper surface adjacent to the pen body 6 in the middle part, and the pen body 6 and the pen core 7 are attached to the front opening 3a of the neck member 3. When inserted, the upper side surface of the pen body 6 comes into close contact with the inner peripheral surface 3e of the neck member 3, and the ridges 7e of the pen core 7 are compressed and deformed and come into close contact with the inner peripheral surface 3e of the neck member 3. Except for the ink groove 7a and the air groove 7b, there is no path through which the ink tank 81a and the outside can flow.

The pen core 7 of this embodiment is provided with a connecting groove 75b for connecting the ink groove 7a and the air groove 7b in the middle thereof. The connecting groove 75b is adjacent to the ink groove 7a and the air groove 7b in the front opening 3a of the neck member 3. Further, the capillary force of the connecting groove 75b is formed so as to be larger than that of the air groove 7b in the portion adjacent to the connecting groove 75b and smaller than that of the ink groove 70a in the portion adjacent to the connecting groove 75b.

Next, a manufacturing method relating to injection molding of the pen core will be described with reference to FIGS. 5 and 6.
5 is a sectional perspective view of a first state in which the pen core is injection molded, FIG. 5A is a view seen from the pen body side, and FIG. 5B is a view seen from the opposite side. FIG. 6 is a cross-sectional perspective view of a second state in which the pen core is injection molded, FIG. 6A is a view seen from the pen body side, and FIG. 6B is a view seen from the opposite side. In FIG. 5, the core pin 101 is arranged in the air groove 7b of the pen core 7, the flat upper cavity 102 is arranged in the ink groove 7a of the pen core 7, and the connecting groove 75b of the pen core 7 is arranged. The lower cavity 103 is arranged. In practice, other injection molding dies (not shown) are arranged so as to surround the pen core 7, and the resin for injection molding flows between the dies to thereby make the pen core 7 Is formed.
At this time, the end portion 101a of the thin core pin 101 arranged in the front groove 71b is in contact with the protrusion 102a corresponding to the position of the connecting groove 75b of the upper cavity 102 at the upper portion thereof, and the lower portion of the lower cavity 103 at the lower portion thereof. The protrusion 103a comes into contact with the core pin 101 to prevent the core pin 101 from moving, and the core pin 101 can be prevented from being damaged.
In this embodiment, the front groove 71b adjacent to the connecting groove 75b of the pen core 7 in the air groove 7b is provided with the opening portion 71 that is open to the outside of the pen core 7, and the protruding portion of the lower cavity 103 is provided. The protrusion 103a of the lower cavity 103 abuts the lower portion of the end 101a of the pen core 7 through the opening 71. FIG. 6 shows a state in which the core pin 101, the upper cavity 102, and the lower cavity 103 are separated from the pen core 7 molded in the state of FIG. Since the front groove 71b of the pen core 7 manufactured as described above is molded with high precision, the ink can be efficiently sucked when the ink is sucked, and the ink remaining in the front portion 71b of the air groove 7b is stabilized. Can be held.

Next, a suction operation for sucking ink into the ink tank will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram showing a state where ink is sucked from the ink bottle. FIG. 8 is a diagram showing a state where ink is sucked from the ink bottle.
As shown in the figure, by removing the barrel body 4 (see FIG. 1) from the neck member 3, the rotation operating portion 84 of the ink suction mechanism 8 can be operated, and by rotating the rotation operating portion 84, the valve body is rotated. In a state where 82 is advanced, the pen body 6 and the pen core 7 are dipped in the ink 300 of the ink bottle 200, and the rotation operation portion 84 is reversely rotated to retract the valve body 82 and set the inside of the ink tank 81a negative. The ink can be sucked into the ink tank 81a from the ink bottle 200 through the pen core 7 under pressure.

Next, the state of writing with the fountain pen of this embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is an enlarged view of a main part in a state where ink is sucked. FIG. 10 is an enlarged view of a main part in a state where writing is performed. The fountain pen 1 shown in FIG. 9 shows a cross section in a state where the fountain pen 1 is lifted up after inhaling ink from the ink bottle, and the pen body 6 is directed downward.
In this state, the ink 300 in the pen core 2 has the ink 300a in the ink groove 7a, the ink 300b in the connecting groove 75b, the ink 300c in the front part of the air groove 7b, and the front part 71b of the air groove 7b. The remaining ink 300c is set so as not to fall from the opening 7c by being pulled up by the air groove 7b due to the surface tension acting near the front end surface 7c.

When writing is started with the fountain pen in the state of FIG. 9, as shown in FIG. 10, the ink 300c contained in the front groove 71b of the air groove 7b moves from the air groove 70b of the portion adjacent to the connecting groove 75b to the capillary force. Moves to the strong connecting groove 75b, and then the ink 300b contained in the connecting groove 75b moves to the ink groove 70a in a portion adjacent to the connecting groove 75b having a stronger capillary force than that of the connecting groove 75b. It becomes possible to write with the pen tip 6a of No. 6, and the ink 300c remaining in the front groove 71b of the air groove 7b can be consumed at the beginning of writing, and falls from the pen core due to impact. It was possible to prevent the paper surface from being soiled.

1... fountain pen, 2... barrel,
3... neck member,
3a... front opening, 3b... outer cylinder, 3c... inner cylinder, 3d... gap, 3e... inner peripheral surface,
4... Shaft barrel body, 5... Crown,
6...pen body
7...Pen lead,
7a... ink groove, 7b... air groove, 7c... front end surface, 7d... rear end surface, 7e... ridge,
71... open part,
71b... front groove, 72b... intermediate groove, 73b... connecting groove, 74b... rear groove, 75b... connecting groove,
70a... Ink groove adjacent to the connecting groove,
70b... an air groove adjacent to the connecting groove,
8... Ink suction mechanism, 8a... Front end portion,
81... Ink storage cylinder, 81a... Ink tank,
82... valve body, 82a... rear opening,
83... push rod, 83a... male screw part,
84... Rotating operation part, 84a... Female screw part, 84b... Large diameter part,
85... holding cylinder, 85a... inner stage,
86... packing,
101... core pin, 101a... end portion,
102... Upper cavity, 102a... Projection,
103... Lower cavity, 103a... Protrusion,
200... Ink bottle, 300... Ink.

Claims (1)

A pen core having an ink groove formed on the upper side surface and an air groove extending from the front side to the rear side, and a pen body adjacent to the upper side surface of the pen core were inserted into the front opening of the barrel. A fountain pen, in which a connecting groove for connecting the ink groove and the air groove is formed in an intermediate portion of the pen core, and a capillary force of the connecting groove is larger than that of an air groove adjacent to the connecting groove. , A fountain pen with a structure smaller than the ink groove in the portion adjacent to the connecting groove.

Images