JPH08207491A - Knock type writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a knock-type writing instrument that can be worn with difficulty in removing a knock body and that has less restrictions when a decoration or the like is provided on the knock operation portion of the knock body. A notched window portion 3 that communicates with the upper end opening 2 of the upper shaft cylinder 1 is provided in the upper end side wall portion, and a bridge portion 7 that crosses over the upper end opening 2 is integrally provided in the upper shaft cylinder 1. The knock body 8 housed inside the upper barrel 1 is provided with a decoration / knock operating portion 10 that penetrates the cutout window portion 3 and projects to the outside, and the knock body 8 is opened inside the upper barrel 1 at the upper end opening 2
When inserted from above, the knocking body 8 and the bridge portion 7 can be overridden by elastic deformation of the bridge portion 7. Conversely, when moving upward, the protruding piece 12 that abuts and locks the bridge portion 7
Is provided integrally with the knock body 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock type writing instrument.

[0002]

2. Description of the Related Art In a knock type writing instrument in which a writing tip of a writing body is projected and withdrawn at a lower end opening of a lower barrel by knocking a knocking body, it is necessary to project the knocking operation portion of the knocking body to the outside of the upper barrel. . When assembling this knock body into the inside of the upper barrel, conventionally, a method of inserting the knock body from the upper end opening of the upper barrel into a portion other than the knock operating portion,
There is a method in which a knock body is inserted from the lower end opening of the upper barrel and the knock operating portion is projected. And, the former method of inserting the knock body from above is apt to prevent the knock body from coming off, and especially when the knock operation section is provided with a decoration or the like, when the user strongly pulls the decoration or the like, There was a problem that the knock body could easily come off. Therefore, there is a restriction that the knocking operation portion of the knocking body must be formed in a shape that is difficult to pinch. On the other hand, the method of inserting the knock body from below can make it difficult for the knock body to come out upward, but since the knock operation portion of the knock body needs to be projected, the shape of the knock operation portion is also restricted, If a decoration is to be attached to the knock operation part, the decoration must be attached later as a separate part, which causes a problem of high cost.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is to solve the above-mentioned problems, that is, in the case where the knocking body can be assembled with difficulty and the decoration is provided on the knocking operation portion of the knocking body. The purpose is to provide a knock-type writing instrument with few restrictions.

[0004]

In order to achieve the above object, the knock-type writing instrument of the present invention is provided with a notch window portion 3 which communicates with an upper end opening 2 of an upper barrel 1 in an upper end side wall portion.
A bridge portion 7 that crosses over the upper end opening 2 is integrally provided in the upper barrel 1, and a knocking body 8 housed inside the upper barrel 1 penetrates the notched window portion 3 and projects to the outside. When the knock body 8 is inserted into the upper barrel 1 from the upper end opening 2, the knock body 8 and the knock body 8 can be overcome by the elastic deformation of the knock body 8 and the bridge 7. On the contrary, when moving upward, a projecting piece 12 that abuts and locks the bridge portion 7 is integrally provided on the knock body 8.

In order to reinforce the bridge portion 7 for preventing the knock body 8 from coming off, in order to prevent deformation and damage when the knock body 8 hits, the bridge portion 7 provided on the upper barrel 1 is abutted on both sides. It is desirable to fit the crown 16 provided with the rib 20 on the top surface portion to the upper end portion of the upper barrel 1.

[0006]

The knocking body 8 of the present invention is inserted into the upper barrel 1 through the upper end opening 2, and the ornament / knock operating portion 10 penetrates through the cutout window portion 3 and projects to the outside. There are few restrictions on the shape of the portion 10, and a free design can be performed. Further, the knocking body 8 is securely prevented from coming off by the protruding piece 12 being locked to the bridge portion 7 provided on the upper barrel 1.

[0007]

Embodiments of the present invention shown in the drawings will be described in detail below. First, FIGS. 1 to 4 show the upper barrel 1. FIG. 1 is a front view seen from the front, FIG. 2 is a plan view seen from above, FIG. 3 is a side view seen from the side, and FIG. Shows respective cross sections along the line AA in FIG. The upper barrel 1 is a resin molded product, and a vertically long notched window portion 3 that opens to the upper end opening 2 is provided at each of the front and rear surfaces of the upper end side wall portion 4, and the notched window portion of the upper end surface is formed. The leg portions 5 are provided so as to project upward from two left and right positions on both sides of the base plate 3, and locking projections 6 are provided on the outer side surfaces of the leg portions 5. Further, a bridge portion 7 is provided which laterally traverses over the upper end opening 2 and integrally connects the left and right ends thereof to the upper ends of the left and right leg portions 5, respectively. Further, locking ribs 9 for a knock body 8 described later are provided on the left and right inner surface portions of the side wall portion 4 between the front and rear cutout window portions 3.

Next, FIGS. 5 and 6 show the knock body 8, FIG. 5 showing a side face, and FIG. 6 showing a back face. This knock body 8 is also a resin molded product, and a decorative and knock operation portion 10 having a substantially circular ear shape is projected at the upper end on the front side, and a projecting piece 11 is provided immediately below it.
Further, a protruding piece 12 for retaining is provided on the back side after the protruding piece 11, and a protruding piece 13 for pressing is further provided at a lower position thereof. Further, locking shoulders 14 are provided at substantially the same positions as the front and rear projecting pieces 11 and 12 on both side surfaces of the knock body 8, and the knock body 8 has a lower end portion which is inserted into an upper end opening of a tube of a ballpoint pen refill 22. A thin rod portion 15 for connection is provided.

As shown in FIG. 7, the knock body 8 is housed movably up and down inside the cutout window portion 3 inside the upper barrel 1 and outside the locking ribs 9 for decoration and knock operation. The portion 10 is vertically movable while penetrating the cutout window portion 3. In order to store the knock body 8 inside the upper barrel 1, a method of inserting the knock body 8 from the upper end opening 2 of the upper barrel 1 is adopted. When the knock body 8 is inserted, the lower protruding piece 13 first hits the bridge portion 7. However, when the knock body 8 is strongly pressed, both the knock body 8 and the bridge portion 7 are elastically deformed so that the protruding piece 13 is moved to the bridge portion 7.
Get over. Next, the upper protruding piece 12 also hits the bridge portion 7 in the same manner, but in this case as well, if strongly pressed, the knocking body 8
By the elastic deformation of the bridge portion 7, the protruding piece 12 gets over the bridge portion 7. This completes the insertion work of the knock body 8. In addition, in order to easily get over the bridge portion 7 of the projecting pieces 13 and 12, the lower end edges of the projecting pieces 13 and 12 are inclined. When the knock body 8 is moved upward while being housed inside the upper barrel 1, the upper edge of the projecting piece 12 hits the bridge portion 7 and is prevented from coming off. The upper edge of the protruding piece 12 is horizontal and it is extremely difficult to get over the bridge portion 7.

A crown 16 is fitted on the upper end of the upper barrel 1. 8 to 10 show the crown 16,
FIG. 8 shows a bottom surface as viewed from below, FIG. 9 shows a cross section taken along line BB of FIG. 8, and FIG. 10 shows a cross section taken along line CC of FIG. This crown 16 is also a resin molded product,
It has a substantially hemispherical shape, has locking wall portions 17 on the left and right inner surfaces, respectively, and has locking projections 18 on the locking wall portions 17, and at the positions slightly inside the locking wall portions 17, the locking walls 17 are provided. Ribs 19 parallel to the stop wall portion 17 are provided at four locations.
Further, two ribs 20 which are lower than the above ribs 19 and which are perpendicular to the ribs 19 are provided in parallel with each other in the center portion of the top surface so as to project in parallel. The distance between the two ribs 20 on the top surface is set to be substantially the same as the wall thickness of the bridge portion 7 provided on the upper barrel 1, and the distance between the locking wall portion 17 and the rib 19 is set to be the same. The thickness is set to be substantially the same as the thickness of the leg portion 5 provided on the upper barrel 1. The crown 16 is also formed with a notched window portion 21 at a position corresponding to the notched window portion 3 provided in the upper barrel 1.

FIG. 11 shows a state in which the crown 16 is fitted to the upper end portion of the upper barrel 1, and the bridge portion 7 of the upper barrel 1 is fitted between the ribs 20 of the crown 16. The ribs 20 sandwich both sides of the bridge portion 7. Thereby, the bridge portion 7 is reinforced by the ribs 20 and is less likely to be deformed or damaged. In addition, crown 1
6, the locking wall 17 of the upper shaft cylinder 1 faces the outer surface of the leg 5 of the upper barrel 1, and the locking projection 18 of the locking wall 17 rides over the locking projection 6 of the leg 5 by elastic deformation. Moreover, the side surface of the rib 19 of the crown 16 contacts the inner side surface of the leg portion 5, and the leg portion 5 is sandwiched between the locking wall portion 17 and the rib 19.

FIG. 12 shows the structure of the writing instrument as a whole. The knocking body 8 is housed inside the upper barrel 1, and the thin rod portion 15 at the lower end is made into the ballpoint pen refill 2 as described above.
It is connected by inserting it into the upper opening of the second tube. Further, the knock body 8 is biased upward by the return spring 23. As shown in the figure, when the decoration / knock operating portion 10 of the right knock body 8 is pushed downward, the knock body 8 moves downward while compressing the return spring, and the ballpoint pen refill 22.
Also, the lower end brush tip portion is pushed down to protrude from the lower end opening of the lower barrel 24. In this state, the knock body 8 is displaced a little inward, and the engaging shoulder portion 14 is engaged with the lower end portion of the engaging rib 9 of the upper barrel 1 to prevent the upward movement, thereby enabling writing. After the writing is finished, when the lower end writing tip portion of the ballpoint pen refill 22 is immersed in the lower barrel 24,
It is sufficient to push the knock body 8 on the left side on the opposite side slightly downward. The protruding piece 13 for pressing the knock body 8 on the left side moves downward,
The right-hand knocking body 8 and the right knocking body 8 and the The connected ball-point pen refill 22 is moved upward by the force of the return spring 23, so that the lower end writing tip portion of the ball-point pen refill 22 is retracted into the lower barrel 24.

[0013]

The present invention is as described above, and the upper barrel 1
It is possible to reliably prevent the knock body 8 from being pulled out, and to reduce the restriction on the shape of the knock operating portion 10 of the knock body 8, which makes it possible to freely decorate. If the crown 16 is fitted to the upper end of the upper barrel 1 as described in claim 2, the bridge portion 7 is reinforced by the ribs 20 to prevent deformation and damage even if the knock body 8 hits. be able to.

[Brief description of drawings]

FIG. 1 is a front view of an upper barrel.

FIG. 2 is a plan view of an upper barrel.

FIG. 3 is a side view of an upper barrel.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a side view of a knock body.

FIG. 6 is a rear view of the knock body.

FIG. 7 is a cross-sectional view showing a state where the knock body is assembled to the upper barrel.

FIG. 8 is a bottom view of the crown.

9 is a sectional view taken along line BB of FIG.

10 is a cross-sectional view taken along line CC of FIG.

FIG. 11 is a sectional view showing a state in which the crown is fitted to the upper end of the upper barrel.

FIG. 12 is a cross-sectional view of the whole writing instrument with an intermediate portion omitted.

[Explanation of symbols]

 1 Upper Shaft Cylinder 2 Upper End Opening 3 Notch Window 4 Side Wall 5 Leg 6 Locking Protrusion 7 Bridge 8 Knocking Body 9 Locking Rib 10 Decorative / Knocking Operation 11 Projecting Piece 12 Projecting Piece 13 Projecting Piece 14 Locking Shoulder Part 15 Thin rod part 16 Crown crown 17 Locking wall part 18 Locking protrusion 19 Rib 20 Rib 21 Notched window part 22 Ballpoint pen refill 23 Return spring 24 Lower barrel

Claims (2)

[Claims] 1. A notched window portion 3 which communicates with an upper end opening 2 of an upper shaft cylinder 1 is provided in an upper end side wall portion, and a bridge portion 7 which crosses the upper end opening 2 is integrally provided in the upper shaft cylinder 1. The knock body 8 housed inside the upper barrel 1 is provided with a decorative / knock operating portion 10 that penetrates the cutout window portion 3 and projects to the outside, and the knock body 8 is placed inside the upper barrel 1 at the upper end. When inserting from the opening 2, the knocking body 8 and the bridge portion 7 can be overridden by elastic deformation of the bridge portion 7, and when moving upward, conversely, the protrusion that abuts and locks on the bridge portion 7 A knock-type writing instrument, wherein the piece 12 is integrally provided on the knock body 8. 2. The knock type according to claim 1, wherein a crown 16 having ribs 20 abutting on both sides of a bridge portion 7 provided on the upper barrel 1 is provided on an upper surface of the upper barrel 1, and the crown 16 is fitted to the upper end of the upper barrel 1. Writing instrument.