JP2561492Y2 - Writing implement - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a writing instrument.

[0002]

2. Description of the Related Art Conventionally, an interior member such as a collector for connecting a writing member such as a pen core to a tip end is fixed to a barrel body by press-fitting, and a front shaft is also solidified by press-fitting into the barrel body. There is a writing implement.

[0003] This type of writing implement is assembled by a procedure in which an interior member is first press-fitted into a barrel body and fixed, and then the front shaft is press-fitted into the barrel body and fixed. There is a problem of bad. Further, there is also a problem that when the interior member and the front shaft are press-fitted into the shaft cylinder main body, the length in the axial direction varies, and the defect rate is high.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention improves the workability of press-fitting an interior member and a front shaft into a barrel body, and further improves the space between the interior member and the front shaft caused by press-fitting. An object of the present invention is to provide a writing instrument capable of absorbing a variation in an axial direction and reducing a defective rate.

[0005]

In order to achieve the above object, a writing instrument according to the present invention has an interior member for connecting a writing member to a distal end fixed to a barrel body by press-fitting, and a front shaft is also fixed to the barrel body. In a writing instrument adapted to be fixed by press fitting, a front shaft is provided on the outer surface of the front end of the interior member with a locking projection which can be pushed over from the front and cannot be pulled over from the rear and a front shaft is provided behind the locking projection. It is characterized in that a loose fitting portion capable of moving by a required amount in the axial direction is provided.

[0006]

According to the present invention, the front shaft can be temporarily fitted to the loose fitting portion of the interior member. Therefore, the interior member and the front shaft can be press-fitted integrally into the shaft cylinder. Further, in the loose fitting portion of the interior member, the front shaft can obtain a degree of freedom in the axial direction with respect to the interior member.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, FIG. 1 shows a state in which a collector 1 as an interior member and a front shaft 2 are press-fitted into a barrel body 3 and fixed. The collector 1 has a large number of circumferential narrow grooves 4 for storing ink in the outer peripheral part of the latter half, and has an axial through-hole 5 in the center, and a pen core 6 is inserted into the front end of the through-hole 5. I'm wearing A locking projection 7 is provided on the outer peripheral portion of the front end of the collector 1. This locking projection 7 has a tapered surface 8 at the front end as shown in FIG. 2, and the rear side surface is perpendicular to the axial direction. The front shaft 2 has a cylindrical shape, the inner diameter of which is smaller than the outer diameter of the locking projection 7 of the collector 1, and a tapered surface 9 provided on the inner surface of the rear end. The collector 1 and the front shaft 2 are both made of resin, and the front shaft 2 can be pressed into the outer periphery of the collector 1 by elastically deforming the locking projection 7 from the front as shown in FIG. Tapered surface 8 of locking projection 7 and tapered surface 9 of front shaft 2
Facilitates its press fitting. Behind the locking projection 7 on the front shaft 2, the loose fitting portion 1 in which the front shaft 2 can move a required distance in the axial direction.
0 is provided. That is, the axial length of the loose fitting portion 10 is longer than the axial length of the front shaft 2 by α as shown in FIG. The value of α is arbitrary. When the collector 1 and the tip shaft 2 are pressed into the barrel body 3 and fixed,
First, as shown in FIG. 3, the front shaft 2 is press-fitted into the outer peripheral portion of the collector 1, and thereafter, the collector 1 and the front shaft 2 can be press-fitted integrally into the barrel body 3. If there is an axial variation in the position of the collector 1 and the front shaft 2 during the press-fitting, the front shaft 2 can be moved in the free fitting portion 10 of the collector 1 to absorb the variation.

[0008]

[Effects of the Invention] The present invention is as described above. When the front shaft and the interior member are press-fitted and fixed to the barrel body, the front shaft and the interior member are temporarily assembled and the press-fitting process is integrally performed. It has the effect of improving workability because it can be performed. In addition, since the front shaft can be moved a required distance in the axial direction at the free fitting portion of the interior member, the variation in the axial direction generated at the time of press-fitting can be absorbed and the defect rate can be reduced. There is also an effect that can be done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an interior member and a front shaft are press-fitted into a barrel body and fixed.

FIG. 2 is a partially enlarged cross-sectional view of a part of the interior member where a locking projection is provided.

FIG. 3 is a sectional view of a state in which the interior member and the front shaft are temporarily assembled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collector 2 Front shaft 3 Shaft barrel main body 4 Narrow groove 5 Through hole 6 Pen core 7 Locking projection 8, 9 Tapered surface 10 Free fitting portion

Claims (1)

(57) [Scope of request for utility model registration] 1. A writing instrument in which an interior member for connecting a writing member to a distal end is fixed to a barrel body by press-fitting, and a tip shaft is also fixed to the barrel body by press-fitting. The front shaft is provided with a locking projection which can be pushed over from the front by press-fitting but cannot be pulled over from the rear, and a play fitting portion is provided behind the locking projection so that the front shaft can move by a required amount in the axial direction. Writing implements.