JP4156443B2 - Writing instrument assembly method and writing instrument assembled by the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when the cap is detachably screwed to the shaft tube, the cap and the shaft tube are finally screwed so that the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft tube are aligned. The present invention relates to a method for assembling a writing instrument whose position is determined and a writing instrument assembled by the method .
[0002]
[Prior art]
In the past, writing instruments with a cap detachably screwed onto a shaft cylinder have been known, and in order to create a sense of quality, the surface of the cap or the shaft cylinder has been given a picture or pattern, or a novel design. In order to increase the accuracy, it is also known that the outer shape of the cap and the shaft tube is not a mere cylindrical shape but a polygonal cross-sectional shape. Recently, a cap and a shaft cylinder made of a transparent resin material have been proposed.
[0003]
[Problems to be solved by the invention]
However, in a writing instrument in which the cap is detachably screwed to the shaft cylinder, when the writing instrument is the latter, when the cap is screwed to the shaft cylinder and the screw fitting is completed, the cap and shaft There is a problem that the pattern of the cylinder does not become continuous (aligned), or the ridgeline at the corner of the cap or the shaft cylinder does not continue between the cap and the shaft cylinder. Further, in a fountain pen or the like, since the pen has a front and back shape, it serves as a mark for specifying a circumferential position in the shaft cylinder, and a clip is attached to the cap to mark a circumferential position. When the cap is made of a transparent resin material, the positional relationship between the pen and the clip can be seen from the outside. Therefore, it is beginning to be required that the orientation of the pen is aligned with the position of the clip.
[0004]
As means for solving these problems, the start position and end position of the female thread part or male thread part formed on the cap and the shaft tube, the pattern and ridge line of the cap and the shaft tube are always continuous when the screw fitting is completed ( There is a method of setting the position specified in the circumferential direction. For example, when the cap and the shaft tube are formed by injection molding, as disclosed in Japanese Patent Laid-Open No. 11-277971, in the formation of the female thread portion of the cap, the core pin provided with the screw portion is rotated during the injection molding. It is possible to form the male screw portion by using a split mold or the like by pulling straight without doing. However, the above method cannot be adopted if the cap or the shaft tube is made of metal.
[0005]
Japanese Patent Application Laid-Open No. 2002-86975 discloses another means, but the shaft cylinder relates to a structure in which the trunk portion and the neck portion are connected by a connecting member, and the shaft does not have a connecting member. There is a problem that it cannot be adopted in the cylinder.
[0006]
In view of the current situation, the present inventors, regardless of the material of the cap or the shaft tube, may be a structure in which the shaft tube is composed of a neck portion and a body portion and connected by a connecting member as seen in a fountain pen, for example. A state where the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft cylinder are aligned when the cap is screwed into the shaft cylinder without being affected by such a structure, for example, the cap The present invention has been conceived to provide a method for assembling a writing instrument in which screw fitting is completed in a state where the pattern of the cylinder and the shaft tube are continuous (aligned), and a writing instrument assembled by the method .
[0007]
[Means for Solving the Problems]
The present invention
“1. A writing instrument in which a cap having an inner cylindrical body disposed therein is detachably screwed into a shaft cylinder, and a female thread portion is formed on an inner wall surface communicating with the inside and outside of the cap at the head end portion of the cap. The engagement hole portion provided is formed, an engagement protrusion having a male screw portion meshing with the female screw portion is formed on the inner cylinder body, and the inner cylinder body is screwed with the male screw portion to the female screw portion to cap the cap. In a state where the cap is screwed to the shaft tube and the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft tube are aligned, by rotating the inner cylinder is moved backward, by abutting the abutting portion provided on the open end of the inner cylinder at the distal end of the barrel, determine the final screw engaging position of the cap and barrel A method of assembling a writing instrument , characterized by
2. A writing instrument in which a cap having an inner cylinder disposed therein is detachably screwed to a shaft cylinder, and a female screw portion is provided on an inner wall surface of the cap that communicates with the inside and outside of the cap. An adjustment screw having an engagement protrusion having a male screw portion that meshes with the female screw portion and a support portion that comes into contact with the head end portion of the inner cylinder is formed, and the adjustment screw is arranged in a movable state in the front-rear while rotating relative to the cap screwed a male threaded portion on the female screw portion, for the adjustment of the movable insert and head end around the inner cylinder into the cap The adjustment screw is brought into contact with the screw support portion, and the cap is screwed to the tip of the shaft tube so that the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft tube are aligned. rotated by moving the inner cylinder rearward by moving backward, the contact portion provided on the open end of the inner cylinder By abutting the tip of the tube, the assembly method of the writing instrument being characterized in that to determine the final screw engaging position of the cap and barrel.
3. A writing instrument assembled by the method according to item 1 or 2. "
About.
[0008]
The feature of the present invention is that when the cap is screwed into the shaft cylinder, the screw fitting is completed in a state where the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft cylinder are aligned. The abutting part of the inner cylinder mounted in the cap abuts on the tip of the shaft cylinder, so that the shaft cylinder cannot rotate and advance in the cap end side and the final screw fitting position. To do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. Although the embodiment of the present invention will be described as a fountain pen, the present invention is not limited to this. In addition, the same code | symbol is attached | subjected to the same member and the same location.
The fountain pen 1 according to the present invention shown in FIGS. 1 and 2 has a structure that is well known in the art and is formed by screwing a cap 2 to a shaft tube 3 so as to be detachable. The shaft cylinder 3 includes a neck portion 5 and a body portion 6 to which a pen 4 is attached, and the neck portion 5 and the body portion 6 are screwed (not shown). On the outer peripheral surface of the cap 2 and the barrel portion 6 of the shaft cylinder 3, a plurality of wavy annular patterns 7, 8 that are uneven in the axial direction in the circumferential direction are formed. A male screw portion 10 that meshes with the female screw portion 9 of the cap 2 is provided in front of the trunk portion 6.
[0010]
3 to 6 show an embodiment of the invention according to claim 1, and the clip 11 attached to the cap 2 is a convex portion 7 a that protrudes toward the head end 2 a side of the cap 2 of the annular pattern 7. The pen 4 is arranged on the neck portion 4 so that the surface 4a of the pen 4 and the convex portion 8a protruding on the neck portion 4 side of the annular pattern 8 applied to the body portion 6 are aligned. It is attached.
[0011]
A small-diameter portion 12 that protrudes outward is formed at the head end portion 2 a of the cap 2, and an engagement hole portion 13 that communicates the inside and outside of the cap 2 is formed. The clip 11 has a ring-shaped attachment portion (not shown) inserted into the small-diameter portion 12, and a nut 15 is screwed into a male screw portion 14 formed on the outer peripheral wall surface of the small-diameter portion 12 and tightened. 2 is attached.
[0012]
In the cap 2, an inner cylinder body 16 having a bottom on the head end portion 16 a side is disposed so as to be slidable back and forth with respect to the cap 2. An edge portion 16 b of the opening end portion of the inner cylinder body 16 serves as a contact portion 17 that contacts the tip end edge portion 5 a of the neck portion 5. On the head end portion 16 a of the inner cylinder body 16, an outwardly projecting engagement protrusion 20 having a male screw portion 19 that is screwed into a female screw portion 18 formed on the inner wall surface of the engagement hole portion 13 is formed. It is. The inner cylinder 16 is attached to the cap 2 so that the male screw portion 19 is screwed into the female screw portion 18 of the engagement hole portion 13 and is rotatable and movable .
[0013]
When the cap 2 is screwed to the shaft tube 3, the final screw fitting position is aligned with the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft tube. Assemble the cap.
[0014]
First, the inner cylinder body 16 is rotated by engaging a jig (not shown) with a flat ground cut surface portion 16C (see FIG. 5) formed inside the inner cylinder body 16 so as to be rotated. Keep it moving forward. Next, the cap 2 is screw-fitted to the shaft cylinder 3, and until the screw-fitting is finished (the abutting portion 17 of the inner cylinder body 16 abuts on the tip edge portion 5a of the neck portion 5, Until the shaft cylinder 3 is moved forward. After that, the cap 2 or the shaft tube 3 is rotated in the reverse direction and retracted so that the clip 11 attached to the cap 2 and the surface 4a of the pen 4 are in the same direction in the circumferential direction, and the cap 2 and the body 6 are annularly formed. Rotation / retraction is stopped at a position where the projecting convex portions 7a and 8a of the patterns 7 and 8 are aligned.
[0015]
Next, the inner cylinder 16 is rotated backward in the direction opposite to that described above by engaging a tip (not shown) such as a jig in the engagement groove 21 of the engagement protrusion 20, so that the inner cylinder The abutting portion 17 of the body 16 is brought into abutment with the tip edge portion 5 a of the neck portion 5, and the final screw fitting position between the cap 2 and the shaft tube 3 is obtained. Finally, the head crown 22 is attached to the cap 2 by screwing the female screw portion 24 formed on the inner wall surface of the head crown 22 to the male screw portion 23 formed on the outer peripheral surface of the nut 15.
[0016]
The fountain pen 50 of the invention according to claim 2 shown in FIG. 7 to FIG. 11 is formed with a small diameter portion 12 having an engagement hole portion 13 in the cap 2 as in the case of the above-described embodiment. The clip 11 is attached to the cap 2 in the same manner as in the first embodiment.
[0017]
As shown in FIGS. 7 and 8, the inner cylindrical body 51 having a bottom on the head end 51 a side is inserted into the cap 2 so as to be slidable back and forth (left and right in the figure). It is. The edge part of the opening end part 51b of the inner cylinder 51 is the contact part 52 which contacts the front-end | tip edge part 5a of the neck part 5 similarly to the case of the said embodiment. A male screw portion 53 that meshes with the female screw portion 18 formed on the inner wall surface of the engagement hole portion 13 as shown in FIGS. An adjusting screw 57 composed of a fixed portion 54 having the support portion 55 that contacts the head end portion 51a of the inner cylinder 51 is screwed into the engagement hole portion 13 so as to be slidable. Are arranged. The fixing portion 54 of the adjusting screw 56 is provided with a locking groove 57 for rotating the adjusting screw 56 as in the case of the above embodiment. Further, the cross-sectional shape of the adjusting screw 56 is a shape having a clamping portion 58 for clamping with a jig or the like so as to be inserted from the opening end 2b side of the cap 2 and screwed into the engaging hole portion 13. It is as.
[0018]
When the cap 2 is screwed to the shaft cylinder 3, the final screw fitting position is aligned with the desired position in the circumferential direction of the cap 2 and the desired position in the circumferential direction of the shaft cylinder 3. Assemble the cap as follows.
[0019]
As in the case of the first embodiment, the cap 2 and the shaft tube 3 are screwed together as shown in FIG. At that time, the adjusting screw 56 is clamped with the clamping part 58 with a jig or the like (not shown), the fixing part 54 is inserted into the engaging hole part 13 and screwed, and rotated to rotate the head end of the cap 2. While moving forward as much as possible to the part 2 a side, the inner cylinder 51 is also temporarily press-fitted in the same manner, and the head end 51 a is brought into contact with the support part 55 of the adjusting screw 56. Once the cap 2 and the shaft cylinder 3 are rotated until the screw fitting is completed, and the rotation stops, the cap 2 or the shaft cylinder 3 is rotated in the reverse direction, and the surface of the clip 11 and the pen 4 attached to the cap 2 4a becomes the same direction in the circumferential direction, and rotation / retraction is stopped at a position where the convex portions 7a and 8a of the annular patterns 7 and 8 formed on the cap 2 and the body portion 6 are aligned.
[0020]
In this state, the adjusting screw 56 is rotated backward in the opposite direction, and the inner cylinder 51 with the head end 51 a in contact with the support portion 55 is also retracted, so that the contact portion 52 of the inner cylinder 51 is moved back. Is brought into contact with the leading edge 5a of the neck 5 to obtain a final screw fitting position between the cap 2 and the shaft tube 3. Finally, the head crown 22 is screwed onto the nut 14 and attached to the cap 2 as in the above embodiment.
[0021]
【The invention's effect】
Since the writing instrument according to the present invention has the structure as described above, the cap and the shaft cylinder can be used when the cap is screwed into the shaft cylinder regardless of the material of the cap or the shaft cylinder, and regardless of the structure of the shaft cylinder. In the case of caps and trunks where the pattern of the lacquered picture or pattern applied to the pattern is aligned or continuous, or the outer shape is a polygonal shape, the corner ridge line is continuous with the cap and the shaft tube, Screw fitting is completed.
[Brief description of the drawings]
FIG. 1 is a side view of a fountain pen showing a state before a cap is screwed to a shaft cylinder, showing an embodiment of the writing instrument of the present invention.
FIG. 2 is a side view of the fountain pen showing a state in which the cap is screwed into the shaft cylinder in the fountain pen of FIG.
FIG. 3 shows an embodiment of the invention according to claim 1 and shows an enlarged side view of the main part of the fountain pen with the cap portion in cross section, showing a state in which a cap for explaining assembly is screwed into the shaft cylinder; It is.
FIG. 4 is an enlarged side view of the main part of the fountain pen with the cap portion taken as a cross section, showing a state where the cap is finally screwed into the shaft cylinder in FIG. 3;
FIG. 5 is an enlarged longitudinal sectional view of the inner cylinder in FIG. 3;
6 is a left side view of the inner cylinder in FIG. 5. FIG.
FIG. 7 is an enlarged side view of a main part of a fountain pen with a cross section of a cap portion, showing an embodiment of the invention according to claim 2 and showing a state in which a cap for explaining assembly is screwed into a shaft cylinder; It is.
FIG. 8 is an enlarged side view of the main part of the fountain pen, with the cap portion in cross section, showing a state where the cap is finally screwed into the shaft cylinder in FIG.
9 is an enlarged longitudinal sectional view of the adjusting screw in FIG.
10 is a left side view of the adjusting screw in FIG. 9. FIG.
11 is a right side view of the adjusting screw in FIG. 9. FIG.
[Name of the code]
1, 500 fountain pen 2 Cap 3 Shaft cylinder 7, 8 Annular pattern 13 Engagement hole part 14 Female thread part 16, 51 Inner cylindrical body 17, 52 Contact part 18 Female thread part 19, 53 Male thread part 20 Engagement protrusion part 54 Fixing part 55 Supporting part 56 Adjustment screw

Claims (3)

A writing instrument in which a cap having an inner cylinder disposed therein is detachably screwed to a shaft cylinder, and a female screw portion is provided on an inner wall surface of the cap that communicates with the inside and outside of the cap. Forming a joint hole, forming an engagement protrusion having a male thread part engaging the female thread part on the inner cylindrical body, screwing the male thread part into the female thread part and the male thread part to the cap; arranged in a movable state in the front-rear while rotating, in a desired state of positions aligned in the circumferential direction of the screw fitted cap the barrel by the circumferential direction of the desired position and the barrel of the cap, the inner cylinder The final screw fitting position between the cap and the shaft tube is determined by rotating the screw and moving it backward to bring the contact portion provided at the opening end of the inner tube into contact with the tip of the shaft tube. method of assembling a writing instrument which is characterized. A writing instrument in which a cap having an inner cylinder disposed therein is detachably screwed to a shaft cylinder, and a female screw portion is provided on an inner wall surface of the cap that communicates with the inside and outside of the cap. An adjustment screw having an engagement protrusion having a male screw portion that meshes with the female screw portion and a support portion that comes into contact with the head end portion of the inner cylinder is formed, and the adjustment screw is arranged in a movable state in the front-rear while rotating relative to the cap screwed a male threaded portion on the female screw portion, for the adjustment of the movable insert and head end around the inner cylinder into the cap The adjustment screw is brought into contact with the screw support portion, and the cap is screwed to the tip of the shaft tube so that the desired position in the circumferential direction of the cap and the desired position in the circumferential direction of the shaft tube are aligned. rotated by moving the inner cylinder rearward by moving backward, the contact portion provided on the open end of the inner cylinder By abutting the tip of the tube, the assembly method of the writing instrument being characterized in that to determine the final screw engaging position of the cap and barrel.   A writing instrument assembled by the method according to claim 1.

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