WO2001066364A1 - Pen point - Google Patents

Abstract

A pen point capable of withstanding a high pen pressure, having a copying capability equivalent to that of a ball-point pen, capable of preventing a pen core from being recessed or eliminating the possibility that the bending strength of the pen core becomes insufficient, capable of accurately setting the centering dimension of the pen core at all times, and capable of increasing a productivity, comprising a plastic pen core (2) having an ink capillary passage in axial direction and having a diameter of 1.5 mm or less and a metal holder (3), wherein the plastic pen core (2) forms a small diameter drum part (2d) from a writing part (2b) through a shoulder part with height difference (2c), a length (L) between the shoulder part with height difference (2c) and the tip of the writing part (2b) in axial direction is set to 0.5 ≤ L / D ≤ 1.2, where (D) is a core diameter, the metal holder (3) forms a contact ring part (3c) at a tip part (3b) having a fitting hole (3a) open thereto, and a drum part (2d) is inserted into the fitting hole (3a) in a combined state that the shoulder part with height difference (2c) comes in contact with a contact ring part (3c).

Description

 Technical field

 The present invention relates to a plastic nib for writing a fine line having a line width of about 1.0 mm or less, and particularly having a hard feeling similar to that of a water-based pole pen. The present invention relates to an improved type of a plastic nib described in Japanese Patent Publication No. 08-108. Background art

 This kind of nib, consisting of a plastic pen core and a metal holder, has a low bending strength of the pen core itself, and also has a problem specific to the structure in which the pen core and the holder are fixed by caulking or an adhesive. Therefore, the copying property, that is, high writing pressure, is inferior to that of a water-based pole.

 ①Fixed by swaging

 If the degree of force crimping is such that it does not significantly affect the capillary capacity of the ink groove inside the pen core, the pen core may sink into the holder when high pen pressure is applied. is there. This immersion problem occurs as a result of insufficient strength of the caulking.

 If the metal holder is caulked excessively in order to obtain sufficient fixing strength, the ink groove inside the pen core will be pressed, causing a decrease in the ink flow due to a decrease in the number of capillaries.

 ② Fixing with adhesive

 Although the ink groove inside the pen core is not pressed, it is difficult to obtain a stable adhesive strength that can withstand high writing pressure due to poor adhesion between the plastic of the pen core and the metal of the holder.

In addition, it takes a certain amount of time for the adhesive to cure, It is difficult to keep the protrusion dimension of the tip of the pen tip protruding from the end, that is, the centering dimension constant, it is difficult to reduce the variation of the centering dimension, and the pen tip with a long centering dimension and low bending strength is difficult. It is very difficult to prevent outbreaks.

 Therefore, the present invention is, firstly, capable of withstanding high pen pressure, having a copying property similar to that of a pole pen, having no pen core immersion or insufficient bending strength, and having a uniform centering dimension of the pen core. Second, a pen tip with high productivity, second, a pen tip with improved high pen pressure performance, third, a pen tip with high pen core workability, and fourth, It is another object of the present invention to provide a nib that can be written even when the writing angle is small. Disclosure of the invention

 The present invention comprises a plastic pen core having a capillary passage for ink in the axial direction and having a diameter of 1.5 mm or less, and a metal holder. The plastic pen core has a stepped shoulder from the writing part. A small-diameter body is formed through the section, and the axial length L between the stepped shoulder and the tip of the writing section is set to 0.5 ≤ L / D ≤ 1.2 for the core diameter D. However, in the metal holder, a contact ring is formed at the tip end where the fitting hole is open, the body is fitted to the fitting hole, and the stepped shoulder is brought into contact with the contact ring. Specially, they are fitted. As a result, the pen can withstand high pen pressures, so that it is possible to achieve the same copying properties as a pole pen, and there is no immersion or insufficient bending strength of the pen core, and the centering dimension of the pen core is constant. However, there is the advantage of high productivity. And, due to the contact relationship between the stepped shoulder and the contact ring, the bending strength is higher than that of the writing part with the same outer diameter, so it can withstand higher writing pressure and the copying ability Are better.

 Further, the present invention is characterized in that the abutment ring portion is formed in a form following the stepped shoulder portion. This further enhances the high pen pressure performance and demonstrates higher copy performance.

Further, the present invention is characterized in that the radial width D1 of the stepped shoulder portion is 0.05-0.15 thigh. As a result, it is possible to prevent unnecessary cutting work when forming the stepped shoulder portion and the torso portion, and it is difficult to form the fitting hole. It is possible to avoid processing into small diameters, and it is easy to process both the pen core and the metal holder.

 Further, the present invention is characterized in that the outer diameter of the writing portion and the outer diameter of the tip portion of the metal holder are the same, and the writing portion and the tip portion of the metal holder are continuous without any step. As a result, the writing part and the tip of the metal holder are continuous without any step, so that the metal holder does not interfere with writing unless the writing angle is zero. can do.

 In the present invention, the length L of the writing portion ahead of the stepped shoulder is 0.5≤L / D≤1.2, and it is possible to write to a smaller writing angle while maintaining the desired core bending strength. is there.

 The width of the shoulder in the radial direction is 0.05 to 0.15 mm, which eliminates penetration into the fitting hole at the tip, reduces cutting of the pen core, and makes drilling difficult. Drilling of a small-diameter fitting hole can be avoided. The united relationship by the contact between the stepped shoulder portion and the contact ring portion is a mode in which they can be brought into close contact with each other entirely or in a mode in which they can be brought into contact partially with each other. And, in the former, a mode in which the single surfaces of the flat portions abut and unite, a mode in which the single surfaces of the slope portions abut and merge, a mode in which the single surfaces of the curved portions abut and merge, A mode in which a plurality of surfaces formed by a continuous flat portion and a slope portion are brought into contact with each other, a mode in which a plurality of surfaces formed by a continuous flat portion and a curved surface portion are brought into contact with each other, and a plurality is formed by a continuous slope portion and a curved surface portion. Any of the modes in which the surfaces are brought into contact with each other and united.

The plastic pen core is an extruded product, and is made of a known material such as polyoxymethylene vinyl alcohol, polyether ether ketone, and polycarbonate. The metal holder is a pipe or a machined or injection-molded product, and the material is a known material such as brass steel, nickel silver, stainless steel, titanium, and the like. In the present invention, the pen core may form a protruding ring near the stepped shoulder side of the body. You may make it perform. This protruding ring portion is composed of one or more. The cross-sectional shape may be semicircular, triangular, or any other shape. In the case where a plurality of the protruding ring portions are formed, any of a mode in which the protruding ring portions are adjacent at equal intervals and a mode in which the protruding ring portions are adjacent without any gap may be used. Further, the protruding ring portion is not limited to a continuous ring shape, but may be an intermittent ring shape. The protruding ring portion functions to prevent the pen core from coming off by being pressed against the inner surface of the fitting hole. Either a mode of stopping with frictional resistance, a mode of stopping with crimping, or a mode of stopping with adhesive, or a combination thereof. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view illustrating one embodiment of a pen tip of the present invention. FIG. 2 is a side view of the pen core in the embodiment of FIG. FIG. 3 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 4 is a side view of the pen core in the embodiment of FIG. FIG. 5 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 6 is a side view of the pen core in the embodiment of FIG. FIG. 7 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 8 is a side view of the pen core in the embodiment of FIG. FIG. 9 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 10 is a side view of the vane core in the embodiment of FIG. FIG. 11 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 12 is a side view of the pen core in the embodiment of FIG. FIG. 13 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 14 is a side view of the pen core in the embodiment of FIG. FIG. 15 is a side view illustrating another embodiment of the pen tip of the present invention. FIG. 16 is a side view of the pen core in the form of FIG. (A) and (B) of FIG. 17 are partially enlarged views illustrating another form of the holder in the pen tip of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION FIGS. 1 and 2 show an embodiment of a pen tip according to the present invention. The pen tip 1 comprises a plastic pen core 2 having a diameter of 1.5 mm or less and a metal holder 3. are doing.

 The plastic pen core 2 has a capillary passage 2a for ink in the axial direction, a hemispherical writing portion 2b at the tip, and a stepped shoulder portion 2c behind the writing portion 2b. Through this, a small-diameter body 2d is formed concentrically.

 The shoulder 2c is formed in a single plane in a direction perpendicular to the axis.

 Then, the length L in the axial direction between the stepped shoulder 2c and the tip of the writing section 2b is set to 0.5≤L / D≤1.2 of the core diameter D, and the stepped shoulder 2c is set. The width c1 in the radial direction of c is set to 0.05 to 0.15.

 The metal holder 13 has a fitting hole 3a formed at the center thereof so that the body portion 2d can be fitted into the fitting hole 3a. The contact ring portion 3c is formed in such a manner that the contact ring portion 3c and the stepped shoulder portion 2c can be brought into close contact with each other over the entire surface, that is, a mode that follows the stepped shoulder portion 2c. The outer diameter of the tip portion 3b is the same as the outer diameter of the writing portion 2b, so that the writing portion 2b and the tip portion 3b are flush with each other without any step. The front end 3 d behind the contact ring 3 c is formed in a straight cylindrical shape having the same diameter as the outer diameter of the contact ring 3 c, while a shaft tube (not shown) is formed. A small-diameter cylindrical extension 3f extends from the rear end of the shaft body 3e attached to the shaft.

 The body 2 d of the plastic pen core 2 is press-fitted and fitted into the fitting hole 3 a of the metal holder 13, and the stepped shoulder 2 c of the single-sided form and the contact ring The portions 3c are in close contact with each other so that the writing portion 2b is integrated into a united state in which the writing portion 2b does not sink into the fitting hole 3a even under a high writing pressure load.

 In addition, the barrel 2 d of the pen core 2 protruding from the rear end of the shaft trunk 3 e is caulked integrally with the cylindrical extension 3 f so that the pen core 2 does not come out of the holder 3. Thus, the pen core 2 and the holder 3 are integrated.

FIGS. 3 and 4 illustrate another embodiment of the pen tip of the present invention. Since the configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and the different configuration will be described.

 The pen tip 1 is formed by arranging a plurality of protruding ring portions 2e at equal intervals near the stepped shoulder portion 2c side of the body portion 2d.

 The protruding ring portion 2e is in close contact with the inner surface of the fitting hole 3a, and the pen core 2 is removed from the holder 3 even if it is not caulked as in the embodiment shown in FIG. The pen core 2 and holder 3 are integrated so that they do not protrude.

 FIGS. 5 and 6 illustrate another embodiment of the pen tip of the present invention. Since the configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and the different configuration will be described.

 The stepped shoulder 2c of the pen core 2 is formed in a form composed of a plurality of surfaces including a continuous planar shoulder 2c1 and a slope shoulder 2c2. The plane shoulder 2c1 on the writing section 2b side is formed in a plane perpendicular to the axis, and the slope section 2c2 is the plane shoulder 2c1 and the body 2d on the slope. Formed continuously.

 The contact ring portion 3c of the metal holder 3 has a shape following the stepped shoulder portion 2c, that is, a flat ring portion 3c1 that can contact the flat shoulder portion 2c1 and a slope shoulder portion 2c2. It is formed in an aspect having a contactable slope ring portion 3c2.

 The body 2 d of the plastic pen core 2 is press-fitted and fitted into the fitting hole 3 a of the metal holder 13, and is brought into contact with the shoulder 2 c having a stepped shape between the plurality of surfaces. The ring portions 3c are brought into close contact with each other and are centered, and are integrated into a united state so that the writing portion 2b does not enter the fitting hole 3a even under a high writing pressure load. ing.

 FIGS. 7 and 8 illustrate another embodiment of the pen tip of the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and the different configuration will be described.

The pen tip 1 has a plurality of protruding rings near the shoulder 2c side of the body 2d. 2 e are formed in parallel at equal intervals.

 The protruding ring portion 2e is in close contact with the inner surface of the fitting hole 3a, and the pen core 2 can be moved from the holder 13 even if it is not caulked as in the embodiment shown in FIG. The pen core 2 and holder 3 are integrated so that they do not come out.

 FIGS. 9 and 10 illustrate another embodiment of the pen tip of the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described.

 The stepped shoulder 2c of the pen core 2 is formed in a single slope. .

 The contact ring portion 3c of the metal holder 3 is formed in a shape following the shoulder 2c, that is, in a slope shape capable of contacting the shoulder 2c.

 The body 2 d of the plastic pen core 2 is press-fitted and fitted into the fitting hole 3 a of the metal holder 3, and the stepped shoulder 2 c of the single-sided form and the contact ring The parts 3c are in close contact with each other and aligned, and the writing part 2b is integrated into a united state so that the writing part 2b does not sink into the fitting hole 3a even under a high writing pressure load. I have.

 FIGS. 11 and 12 illustrate another embodiment of the pen tip of the present invention. Since the configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and the different configuration will be described.

 The pen tip 1 is formed by arranging a plurality of protruding ring portions 2e at equal intervals near the stepped shoulder portion 2c side of the body portion 2d.

 The protruding ring portion 2e is in close contact with the inner surface of the fitting hole 3a, and the pen core 2 is removed from the holder 3 even if it is not caulked as in the embodiment shown in FIG. The pen core 2 and holder 3 are integrated so that they do not protrude.

FIGS. 13 and 14 illustrate another embodiment of the pen tip of the present invention. Since the configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the reference numerals, and the different configuration is explained. I will tell.

 The stepped shoulder 2c of the pen core 2 is formed in a concave curved shape of 1/4 circle. The contact ring portion 3c of the metal holder 3 is formed in a form following the shoulder 2c, that is, a 1/4 circle convex curve that can contact the shoulder 2c. .

 The body 2 d of the plastic pen core 2 is press-fitted and fitted into the fitting hole 3 a of the metal holder 3. The parts 3c are in close contact with each other and aligned, and the writing part 2b is integrated into a united state so that the writing part 2b does not sink into the fitting hole 3a even under a high writing pressure load. I have.

 FIGS. 15 and 16 illustrate another embodiment of the pen tip of the present invention, and the configuration is basically the same as that of the embodiment of FIG. 13 described above. The description of the common configuration will be omitted by applying the same reference numerals, and the different configuration will be described.

 The pen tip 1 is formed by arranging a plurality of protruding ring portions 2e at equal intervals near the stepped shoulder portion 2c side of the body portion 2d.

 The protruding ring portion 2e is in close contact with the inner surface of the fitting hole 3a, and is not crimped as in the embodiment shown in FIG. The pen core 2 and the holder 3 are integrated so that they do not come off.

 FIG. 17 illustrates another embodiment of the metal holder in the pen tip of the present invention. In the embodiment of (A), the tip 3d is slightly larger than the outer diameter of the writing portion 2b. In addition to being formed in a cylindrical shape having a diameter, the distal end portion 3d1 is formed in a slope shape so that a step does not appear between the writing portion 2b and the contact ring portion 3c. In the embodiment of (B), the tip 3d is formed as a truncated cone having a slope having a uniform inclination angle from the periphery of the contact ring 3c having substantially the same outer diameter as the writing part 2b to the shaft body 3e. It is formed in a shape. Industrial applicability

As described above, since the pen tip according to the present invention can withstand high pen pressure, it is possible to exhibit copyability similar to that of a pole pen, and at the same time, the pen core is immersed and the bending strength is low. There are no feet, the centering of the pen core is constant, and there is the advantage of high productivity. Also, due to the contact relationship between the stepped shoulder and the contact ring, the bending strength is higher than that of the writing part with the same outer diameter, so it can withstand higher pen pressure and copy ability. Is better.

Claims

The scope of the claims  1. It consists of a plastic pen core with a capillary passage for ink in the axial direction and a diameter of 1.5 or less, and a metal holder,  The plastic pen core forms a small-diameter body from the writing part via the shoulder with a step, and the length L in the axial direction between the shoulder with the step and the tip of the writing part is 0. Set 5≤L / D≤1.2,  In the metal holder, a contact ring is formed at the tip end where the fitting hole is open, and the body is inserted into the fitting hole in a united state with the stepped shoulder contacting the contact ring. A nib characterized by being provided.  2. The nib according to claim 1, wherein the abutment ring portion is formed in a manner following the stepped shoulder portion.  3. The nib according to claim 1, wherein a radial width D1 of the stepped shoulder is 0.05 to 0.15 mm.  4. The outside diameter of the writing part and the outside diameter of the tip of the metal holder are the same diameter, and the writing part and the tip of the metal holder are continuously continuous without any step. Pen tip described in 1.