JP6862300B2 - fountain pen - Google Patents

Description

The present invention relates to a fountain pen with an opening / closing lid having a structure in which a cursive is housed inside the barrel and the front of the barrel is sealed with an openable / closable lid.

Conventionally, a fountain pen having a structure that prevents ink from drying and dust from entering by providing a lid in front of the barrel has been known, and the fountain pen can be operated by operating an operating body provided on the barrel. A fountain pen having a structure in which the cursive pen in the barrel is moved forward to push open the lid with the pen tip and the pen tip is projected from the barrel is described in Patent Document 1 (Japanese Patent Publication No. 58-39889) and Patent Document 2. (Japanese Unexamined Patent Publication No. 2007-118347).
In the fountain pens found in Patent Document 1 and Patent Document 2, the lid is arranged so as to be inclined in the front-rear direction with respect to the barrel, and the rear end side of the lid is locked by the shaft rod. It is a structure that opens and closes with the base point. When the lid is closed, the back surface of the lid abuts against the front end of the elastic front neck arranged inside the barrel to maintain airtightness.

Jikkai Sho 58-39889 Japanese Unexamined Patent Publication No. 2007-118347

By the way, in the fountain pen having the above structure, the lid is closed by abutting the elastic tip with the elastic force of the spring. Therefore, in order to improve the airtightness, the elastic force of the spring may be set high. It can be considered as one method.
However, in the fountain pen, the cursive is repelled backward by a spring arranged inside the barrel, and when the operating body is operated to project the pen tip from the barrel, the spring is repelled. Since it is necessary to operate against the elastic force of the spring that closes the lid in addition to the force, operability can be improved by setting a high elastic force of the spring that closes the lid. There was a risk of making it worse.
Further, since the fountain pen having the above structure has a structure in which a hard pen point provided at the tip of the pen opens and closes the lid while sliding in contact with the lid, the pen point is used when the cursive moves forward. The pen point touches the front end of the lid even when the cursive slides against the back of the lid, which is strongly closed by the elastic force of the spring, and the back of the lid is worn away, or when the cursive retracts. As a result, the back surface of the lid may be worn down, and as a result, the airtightness of the lid may be deteriorated.

In view of the above problems, it is an object of the present invention to obtain a fountain pen with an opening / closing lid having high airtightness.

The present invention
"A cursive that has a pen tip with a pen and a pen core stacked inside the shaft tube can be moved back and forth, and the lid is elastically repelled at the front end of the tubular elastic tip. The front of the barrel is closed by abutting with the elastic force of the member, and the lid is pushed and opened by the pen tip of the cursive by operating the operation portion provided on the barrel. A fountain pen with an opening / closing lid having an opening / closing lid, the elastic tip of the fountain pen is provided with an outer edge portion, an inner edge portion, and a groove formed between the outer edge portion and the inner edge portion at the front end portion in contact with the lid body. , A fountain pen with an opening / closing lid, characterized in that grease is applied to the front end surface of the outer edge portion and the front end surface of the inner edge portion, and the groove portion is filled with grease. "

The depth and width of the groove provided at the front end of the elastic tip may be set so as to hold the grease to be filled in the groove, and the cross-sectional shape thereof is not particularly limited, and the V shape or U shape is not particularly limited. A semicircular shape or a quadrangular shape can be selected as appropriate.
The elastic tip can be molded from an elastic material such as nitrile rubber, fluororubber, or silicone rubber.
As the grease, fluorine-based grease and silicon-based grease are suitable because they have little effect on the ink.
Further, by forming the outer edge portion and the inner edge portion of the elastic front neck so as to be elastically deformed when the lid body abuts, the lid body is in contact with the front end portion of the elastic front neck with a spring. The grease in the groove of the elastic tip is brought into close contact with the back surface of the lid so as to be pressed against the back surface of the lid, and the airtightness in the barrel can be improved.
When elastically deforming the outer and inner edges, the wall thickness should be determined in consideration of the hardness and shape of the elastic material that forms the elastic neck, and the elastic force of the spring that brings the lid into contact with the elastic neck. It may be set appropriately.

According to the present invention, it is possible to obtain a fountain pen with an opening / closing lid having high airtightness.

FIG. 1 is a vertical cross-sectional view showing a fountain pen according to the present embodiment. FIG. 2 is an enlarged view of a main part. FIG. 3 is a view of the inside of FIG. 2 as viewed from the front. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a front view of the front end surface of the elastic front neck. FIG. 6 is a front sectional view showing a state in which the pen tip is immersed. FIG. 7 is a rear sectional view in a state where the pen tip is immersed. FIG. 8 is a rear sectional view in a state where the pen tip is projected. FIG. 9 is a front sectional view showing a state in which the pen tip is projected.

Next, the fountain pen of the present embodiment will be described with reference to the figure.
In the present embodiment, the side with the pen tip is expressed as the front side and the opposite side is expressed as the rear side.
FIG. 1 is a vertical cross-sectional view showing the fountain pen of the present embodiment, and FIG. 2 is an enlarged view of a main part. FIG. 3 is a front view of the inside of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a front view of the front end surface of the elastic front neck. FIG. 6 is a front sectional view in a state where the pen tip is immersed, and FIG. 7 is a rear sectional view in a state where the pen tip is immersed.

The fountain pen 1 has a cursive body 5 arranged at the rear portion of a barrel 4 in which a front shaft 2 and a rear shaft 3 are screwed together, and a cursive body 8 having an ink tank 7 behind the pen tip 6 is housed inside. doing.
The pen tip 6 is composed of a pen 61 and a pen core 62, and a pen point 61a formed of an osmium-based alloy having a Vickers hardness of 700 HV is provided at the tip of the pen 61 to improve wear resistance. There is.

A tip cover 9 having a tip opening 9a is fixedly fixed to the front portion of the front shaft 2 and integrated.
Further, a hollow pipe 10 is attached to the front portion of the front shaft 2 inside the tip cover 9, and an elastic front neck 11 having elasticity and opening in the front and rear is attached to the front of the hollow pipe 10 to be elastic. The front end portion 111 of the front neck 11 is closed by the lid body 13 elasticized by the holding spring 12.

As shown in the figure, the fountain pen 1 uses a torsion coil spring as the pressing spring 12. The pressing spring 12 has a first arm 12a locked to a locking portion 13a of the lid 13, and a shaft rod 15 fixed to a hollow pipe 10 together with a coil portion 12b together with a supporting portion 13b of the lid 13. The second arm 12c is brought into contact with the side surface of the hollow pipe 10.

The front end portion 111 of the elastic tip 11 is provided with a semicircular groove portion 114 provided between the outer edge portion 112, the inner edge portion 113, the outer edge portion 112, and the inner edge portion 113, and the outer edge portion is provided. Fluorine-based grease G is applied to the front end surface 112a of 112 and the front end surface 113a of the inner edge portion 113, and the groove portion 114 is also filled with grease G. Therefore, when the lid body 13 comes into contact with the front end portion 111 of the elastic front neck 11, in addition to the adhesion between the front end portion 111 of the elastic front neck 11 and the lid body 13 by the pressing spring 12, the grease G is applied to the front end portion. Adhesion can be obtained by filling a minute gap between the portion 111 and the lid 13, and the airtightness can be improved.
In the present embodiment, the elastic tip 11 is formed of nitrile rubber (shore A hardness 70), and the portion where the thickness of the outer edge portion 112 and the inner edge portion 113 is minimized (near the front end surfaces 112a and 113a) is 0. Since it is formed with a thin wall so as to have a thickness of .13 mm, when the lid 13 comes into contact with the front end 111 of the elastic tip 11 by the elastic force of the pressing spring 12, the outer edge 112 and the inner edge 113 Is elastically deformed in the axial direction (rear) and the axial radial direction, and the grease G filled in the groove 114 is brought into close contact with the back surface 13c of the lid 13 to improve the airtightness inside the barrel. be able to.

As shown in FIG. 7, the knock body 5 protruding from the rear end opening 3a of the rear shaft 3 is a knock member made of a tubular resin material having a knock cover 16 made of a bottomed thin metal material opened at both ends. It is attached to 17. Further, inside the knock member 17, a slider 18 in contact with the rear end of the writing body 8 is slidably arranged, and a spring 19 is arranged between the slider 18 and the knock member 17. Both are elastic in the direction of separation. The slider 18 has a convex portion 18a formed at the rear end thereof and a convex portion 17a formed on the inner surface of the knock member 17 so as to come into contact with the slider 18.

Further, in the knock member 17, the first large diameter portion 17b is formed at the front end portion, and the second large diameter portion 17c is provided at a position inside the rear shaft 3 with the knock body 5 arranged on the shaft cylinder 4. A thin third large diameter portion 17d is formed at the rear end portion. As shown in the figure, the knock member 17 and the knock cover 16 are press-fitted into the inner surface 16a of the knock cover 16 so that the second large diameter portion 17c and the third large diameter portion 17d of the knock member 17 are in close contact with each other. The first large diameter portion 17b of the knock member 17 protrudes from the front end of the knock cover 16 with the knock cover 16 attached. Further, a circumferential groove portion 17e is provided on the outer surface of the first large diameter portion 17b of the knock member 17, and an O-ring 20 is fitted in the groove portion 17e. As shown in the figure, the knock body 5 retracts due to the elastic force of the slider 18 and the spring 19 that come into contact with the cursive body 8 repelled by the spring 14, and the O-ring 20 comes into close contact with the rear inner surface 4a of the rear shaft 4. It is in a state of being.

FIG. 8 is an enlarged rear view when the knock body is knocked. By pressing the knock body 5 at the rear part of the barrel 4 forward as shown in the figure, although not described in detail, the rotary cam mechanism (not shown) arranged in the barrel operates to activate the cursive. While the pen tip 6 of 8 moves forward, the lid 13 is opened by rotating the shaft rod 15 around the axis (see FIG. 9).

Explaining the front portion of the fountain pen at the time of the operation with reference to FIG. 9, the lid 13 that sealed the front end portion 111 of the elastic tip 11 is opened by the forward movement of the pen tip 6 of the cursive body 8, and the tip cover The pen tip 6 protrudes from the tip opening 9a of 9. At this time, the spring 14 is compressed between the protrusion 2a formed on the inner surface of the front shaft 2 and the step portion 8a of the cursive body 8.

By knocking the knock body 5 again, the pen tip 6 is immersed in the tip opening 9a, and the lid body 13 comes into contact with the front end portion 111 of the elastic tip 11 due to the elastic force of the pressing spring 12, and the barrel is pressed. Seal (see FIGS. 2 and 6).

1 ... Fountain pen,
2 ... front axle, 2a ... inner stage,
3 ... Rear shaft, 3a ... Rear end opening,
4 ... Axle cylinder, 4a ... Rear inner surface,
5 ... Knock body,
6 ... Pen tip, 61 ... Pen, 61a ... Pen point, 62 ... Pen core, 62a ... Front part,
7 ... Ink tank,
8 ... cursive, 8a ... outer,
9 ... Tip cover, 9a ... Tip opening,
10 ... Hollow pipe,
11 ... Elastic tip, 111 ... Front end, 112 ... Outer edge, 112a ... Front end face, 113 ... Inner edge, 113a ... Front end face, 114 ... Groove,
G ... Grease,
12 ... Holding spring, 12a ... First arm, 12b ... Coil part, 12c ... Second arm,
13 ... lid, 13a ... locking part, 13b ... support part, 13c ... back side,
14 ... Spring,
15 ... Shaft rod,
16 ... Knock cover, 16a ... Inner surface,
17 ... Knock member, 17a ... Convex part, 17b ... First large diameter part, 17c ... Second large diameter part, 17d ... Third large diameter part, 17e ... Groove part, 17f ... Maximum diameter part,
18 ... slider, 18a ... convex part,
19 ... Spring,
20 ... O-ring.

Claims (1)

A cursive pen with a pen and a pen core stacked inside the shaft tube is housed in a forward-moving manner, and a lid is elastically attached to the front end of the tubular elastic tip. The front of the barrel is closed by abutting with the elastic force of the cursive, and the lid is pushed and opened by the pen tip of the cursive by operating the operation portion provided on the barrel. A fountain pen with an opening / closing lid having a structure, the elastic nib is provided with a groove formed between an outer edge portion and an inner edge portion and the outer edge portion and the inner edge portion at a front end portion in contact with the lid body. A fountain pen with an opening / closing lid, characterized in that grease is applied to the front end surface of the outer edge portion and the front end surface of the inner edge portion, and the groove portion is filled with grease.

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