JP3916218B2 - Ballpoint pen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ballpoint pen that can accommodate two types of ballpoint pen refills having different outer diameters and overall lengths in a shaft cylinder and can be pressed forward.
[0002]
[Prior art]
Conventionally, the structure of a ballpoint pen that stores and holds the ballpoint pen feeler in the shaft tube is different depending on the shape of the ballpoint pen feel. For example, ink with shear thinning viscosity is statically high in viscosity, and when the shear force is applied to the ink by rotation of the ball due to writing, etc., the viscosity decreases and the ink consumption is large. The outer diameter of the tube is generally φ5.0 mm or more. On the other hand, oil-based inks with high viscosity have a small ink consumption, so that the outer diameter of the ink storage tube of the ballpoint pen refill is often a relatively small diameter of φ4.0 mm or less. Further, the lengths of both ballpoint pen refills are also different, and the latter is formed longer. Therefore, conventionally, the ballpoint pen refill containing the shear-thinning ink has been accommodated in the shaft tube, and the ballpoint refill containing the oil-based ink has been accommodated in the shaft tube. Recently, however, environmental problems have been addressed, and there is a demand for a ballpoint pen that can individually store a ballpoint pen refill containing shear-thinning ink and a ballpoint pen refill containing oil-based ink in a single cylinder for effective utilization of resources. .
[0003]
With respect to such a ballpoint pen that can accommodate two types of ballpoint pen refills having different outer diameters and overall lengths, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-254878, “ballpoint pens suitable for two types of ballpoint pen cores” The rear end of the tube or the tail plug housed in the rear end is contacted with the first abutting portion that abuts the rear end of the ballpoint pen core and the rear end of the ballpoint pen core of other dimensions. A ballpoint pen provided with a second contact portion in contact therewith is disclosed.
[0004]
By the way, in order to prevent the ballpoint pen feeler stored in the shaft barrel from rattling in the shaft barrel, the ballpoint pen feeler is pressed toward the tip end of the shaft barrel by an elastic body such as a coil spring, and connected to the inner wall of the shaft barrel and the shaft barrel. A ballpoint pen is known that is housed in contact with a provided tip member or the like. Such a structure has an advantage that the ballpoint pen feel can be held so that it does not rattle regardless of variations in dimensions in the longitudinal direction of the ballpoint pen feel because the ballpoint pen feel is stored in contact with the inner wall of the shaft cylinder.
[0005]
[Problems to be solved by the invention]
However, when a coil spring is provided at the rear end of the barrel, the rear end of the ballpoint pen reef is brought into contact with the coil spring. Could not be stored.
[0006]
In view of such a problem, the present invention is to provide a ballpoint pen in which two types of ballpoint pen refills having different overall lengths and outer diameters can be individually stored, and the stored ballpoint pen refills are pressed forward.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention stores a ballpoint pen fill formed by filling an ink storage tube with ink for a writing instrument in a shaft cylinder, and a coil spring disposed at a rear end portion of the shaft cylinder. In a ballpoint pen formed by pressing a ballpoint refill forward, the coil spring is connected to a first coil portion, a second coil portion having a smaller diameter than the first coil portion, and the first coil portion of the second coil portion. The bottom end of the coil spring is bent inward at the rear end opening on the side opposite to the side where the coil is continuously provided, or the side opposite to the side where the first coil part of the second coil part is continuously provided And forming a step portion projecting inwardly in the rear end portion of the shaft tube, and forming a first coil portion on the step portion. And the step portion constituted by the second coil portion is connected to the second coil portion. A space is formed in the direction along the axial center between the end portion and the shaft tube so as to contact, and the rear end portion of the ball pen refill is brought into contact with the front end surface of the first coil portion to compress the first coil portion. By pressing the ballpoint pen feel forward, the rear end portion of the ballpoint pen feeler is brought into contact with the bottom portion or the reduced diameter portion of the second coil portion to expand the second coil portion toward the rear end side of the shaft cylinder. The ballpoint pen feeler is pressed forward, and two kinds of ballpoint pen feelers having different outer diameters and overall lengths can be individually stored.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. In the drawings, the same members and the same portions are denoted by the same reference numerals. A ballpoint pen 1 that can accommodate two types of ballpoint pen refills shown in FIGS. 1 to 6 has a structure in which a base 3 is screwed onto the tip of a shaft tube 2. A step portion 2b protruding inward is formed at the rear end portion of the shaft tube 2, and the first coil portion 10 at the tip portion located on the base 3 side is provided on the step portion 2b. A step portion 12 constituted by the first coil portion 10 and the second coil portion 11 of the coil spring 9 in which the second coil portion 11 having a smaller diameter than the coil portion 10 is continuously provided is held in contact therewith. The rear end of the second coil portion 11 forms a bottom portion 11a provided by bending the coil wire inward, and the inner wall that closes the rear end portion 11a of the second coil portion 11 and the rear end of the shaft tube 2 is provided on the inner wall. A gap 13 is formed.
[0009]
The first ball-point pen refill 4 containing the ink to which shear thinning has been applied and a grease-like ink follower (not shown) has an outer diameter of about 6.0 mm and a total length of about 87 mm. A tip holder 6 fitted with a ballpoint pen tip 7 is attached, and a refill tail plug 8 having an air flow path (not shown) is attached to the rear end portion. The rear end face 8a of the refill tail plug 8 of the first ballpoint pen refill 4 is brought into contact with the front end face 10a of the first coil part 10 so that the first coil part is compressed (in the direction opposite to the arrow F). The refill 4 is pressed forward (in the direction of arrow F) toward the tip opening 2 a side of the shaft cylinder 2 so that the stepped portions of the ballpoint pen tip 7 and the tip holder 6 are brought into contact with the inner wall of the base 3. Is projected from the opening 3 a of the base 3 and stored in the shaft tube 2.
[0010]
Next, in FIGS. 5 and 6, the outer diameter of the oil-based ink (not shown) that is smaller than the outer diameter of the first ballpoint pen refill 4 and longer than the entire length of the first ballpoint pen refill 4 is about A case will be described in which the second ballpoint pen refill 14 with the ballpoint pen tip 17 attached directly is accommodated in the ink containing tube 15 having a length of 3.0 mm and a total length of about 98.2 mm. First, after removing the tip member 3 from the shaft cylinder 2 and taking out the first ballpoint pen refill 4, the rear end surface 15 a of the ink containing tube 15 of the second ballpoint pen refill 14 is placed on the bottom 11 a of the second coil portion 11. The two coil portions 11 are brought into contact with each other so as to expand in the rear end direction (the direction opposite to the arrow F) when the shaft cylinder 2 is closed, and the tip member 3 is screwed. As described above, the step 12 of the coil spring 9 is brought into contact with the step 2b of the shaft cylinder 2, and the gap 13 is formed in the inner wall where the bottom 11a of the second coil 11 and the rear end of the shaft cylinder 2 are closed. Therefore, the second ballpoint pen refill 14 is pressed forward (in the direction of arrow F) on the tip opening 2a side of the shaft tube 2, and the stepped portion between the ballpoint pen tip 17 and the ink containing tube 15 is the inner wall of the base 3. The tip of the ball-point pen tip 17 protrudes from the opening 3 a of the base 3 and is housed in the shaft tube 2.
[0011]
As described above, the shape of the coil spring 9 is such that the rear end surface 8a of the refill tail plug 8 of the first ballpoint pen refill 4 abuts on the front end surface 10a of the first coil portion 10, so that the inner diameter M of the first coil portion 10 is The refill tail plug 8 has a smaller diameter (M <K) than the outer diameter K of the rear end face 8a. Further, since the rear end surface 14a of the second ballpoint pen feel 14 is brought into contact with the bottom portion 11a of the second coil portion 11, the inner diameter N1 of the second coil portion 11 is set to the outer diameter L of the rear end portion of the second ballpoint pen feel 14. It is necessary to make the diameter larger (N1> L).
[0012]
Next, the ballpoint pen 21 in the second embodiment will be described. As shown in FIGS. 7 and 8, the coil spring 29 includes a first coil portion 30 at a tip end portion and a second coil portion 31 having a smaller diameter than the first coil portion 30. The rear end of the second coil portion 31 gradually reduces the outer diameter of the second coil portion, so that the inner diameter N2 of the reduced diameter portion 31a of the second coil portion 31 is the outer diameter of the second ballpoint pen refill 14. The diameter is smaller than L (N2 <L). A step portion 32 constituted by the first coil portion 30 and the second coil portion 31 of the coil spring 29 is brought into contact with a step portion 2b formed in the shaft tube 2, and the reduced diameter portion 31a of the second coil portion 31 is contacted. It arrange | positions so that the gap | interval 33 may be formed in the inner wall which obstruct | occluded the edge part and the rear end of the axial cylinder 2. FIG. The ballpoint pen refill 14 has a rear end surface 15a of the ink containing tube 15 reduced to a reduced diameter portion 31a of the second coil portion 31, and a rear end direction (opposite direction of the arrow F) where the second coil portion 31 is closed. ) Is extended so as to expand, and is biased toward the tip of the shaft tube (in the direction of arrow F).
[0013]
Although not shown, when the first ballpoint pen refill 4 is provided, the first ballpoint pen refill 4 is placed on the distal end surface 30a of the first coil portion 30 as in the first embodiment. The rear end surface 8a of the tail plug 8 attached to the rear end of the ink containing tube 5 is held in contact with it.
[0014]
In the present embodiment, the base 3 is screwed to the tip of the shaft cylinder 2, but although not shown, a tail plug is screwed to the rear end, or the shaft is connected to the front shaft and the rear. The structure may be divided into axes. In addition, the shape and position of the stepped portion that contacts the coil spring is not particularly limited, and the shape of the ballpoint pen refill or the coil spring can be used as long as it is within a member constituting the shaft tube, such as in the shaft tube or the tail plug. What is necessary is just to provide suitably according to a shape.
[0015]
In the present embodiment, for the sake of convenience, the first ballpoint pen refill is filled with the shear-thinning ink and the second ballpoint refill is filled with the oil-based ink. However, the present invention is not limited to this, and is held by the fiber bundle. The ink to be filled in two types of ball-point pen refills, such as water-based ink, can be appropriately selected and used.
[0016]
【The invention's effect】
Since the present invention has the structure as described above, two types of ballpoint pen refills having different overall lengths and outer diameters can be individually stored, and a ballpoint pen in which the stored ballpoint refills are pressed forward can be provided. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part in which a first ballpoint pen refill is provided in a first embodiment.
FIG. 2 is an enlarged cross-sectional view of a main part in FIG.
FIG. 3 is an enlarged view of a coil spring in FIG. 1;
4 is an enlarged view showing a rear end of the coil spring in FIG. 1. FIG.
FIG. 5 is a longitudinal sectional view of a main part in which a second ballpoint pen refill is provided in the first embodiment.
6 is an enlarged cross-sectional view of a main part in FIG. 5. FIG.
FIG. 7 is a longitudinal sectional view of a main part in which a second ballpoint pen refill is provided in the second embodiment. .
FIG. 8 is an enlarged view of the coil spring in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Shaft cylinder 2a Front-end | tip part 2b Step part 3 Tip part 4 1st ball-point pen refill 5 Ink storage pipe 6 Tip holder 7 Tip 8 Refill tail plug 8a Rear end surface 9, 29 Coil spring 10, 30 1st coil part 10a, 30a Front end surface 11, 31 Second coil portion 11a Bottom portion 31a Reduced diameter portion 12, 32 Step portion 13 Space portion 14 Second ball pen refill 15 Ink receiving tube 15a Rear end surface 17 Ball pen tip K Outer diameter L of first ball pen refill The outer diameter M of the second ballpoint pen refill The inner diameter N1 of the first coil portion The inner diameter N2 of the second coil portion The inner diameter of the reduced diameter portion

Claims (1)

In the ballpoint pen formed by storing the ballpoint pen refill filled with the ink for the writing instrument in the ink accommodating tube in the shaft cylinder, and pressing the ballpoint pen feel forward by the coil spring disposed at the rear end portion of the shaft cylinder, The coil spring is connected to the first coil portion with a second coil portion having a smaller diameter than the first coil portion, and the rear end opening of the second coil portion opposite to the side where the first coil portion is provided continuously. The outer diameter of the coil is reduced to the bottom part where the coil wire rod at the rear end of the coil spring is bent inwardly at the part, or the rear end part opposite to the side where the first coil part of the second coil part is continuously provided. And forming a stepped portion projecting inwardly in the rear end portion of the shaft tube, and a stepped portion formed of a first coil portion and a second coil portion is formed on the stepped portion. The direction along the axial center between the rear end of the second coil part and the shaft tube A space portion is formed and abutted, and the rear end portion of the ballpoint pen reef is brought into contact with the front end surface of the first coil portion to compress the first coil portion, thereby pressing the ballpoint refill forward, or of the ballpoint refill The ball pen refill is pressed forward by abutting the rear end portion against the bottom portion or the reduced diameter portion of the second coil portion and expanding the second coil portion toward the rear end side of the shaft tube. A ballpoint pen that can store various types of ballpoint pen refills.

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