JP2001010277A - Barrel of writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a point member not to come off the tip of a barrel in the barrel of a writing utensil, at the holding part of the barrel of which a clip is installed so as to be pinched with the point member arranged at the tip of the barrel through threadingly fitting or forcing. SOLUTION: In this writing utensil, a connecting cylinder 6, which is forced in and threadingly fitted to a point member 4, is provided at the tip of a barrel 1. A plurality of notched parts, one end of each of which is open, are provided in the connecting cylinder 6 so as to make the edge part of the connecting cylinder 6 shrinkable radially. At the edge part, an engaging projecting part 15, the wall surface on the open edge part side of which is made into an inclined surface 13 and the opposite wall surface of which is made into an upright surface 14, is provided. On the inner wall surface of a point member 4, an engaging wall part 16 abutting against the engaging projecting part 15 is provided. When the point member 4 fits to the barrel 1, the inclined surface 13 of the engaging projecting part 15 of the connecting cylinder 6 abuts against the engaging wall part 16 and shrinks radially and then expands radially to the original state of the inclined surface 13 through the passing of the engaging projecting part 15 beyond the engaging wall part 16, resulting in finishing the fitting of the point member to the barrel. The disengaging movement of the point member 4 off the tip of the barrel 1 is checked through the abutting of the upright surface 14 of the engaging projecting part 15 against the edge face 16a of the engaging wall part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument barrel in which a grip is clamped by a tip member disposed at the tip of the barrel, and the grip is mounted on the barrel. The present invention relates to a writing instrument shaft cylinder fixed to the above.

[0002]

2. Description of the Related Art Conventionally, in a barrel of a writing instrument, when a grip portion of the barrel is gripped, a finger or the like is prevented from slipping, or fatigue is reduced in long-time writing, and a phenomenon such as tendonitis is prevented. For a reason such as that described above, a shaft cylinder equipped with a grip formed of a soft elastic body made of rubber or synthetic resin is known.

For example, a grip is inserted into a grip portion having a diameter smaller than the outer diameter of the other portion of the barrel, the rear end surface of the grip is supported by a step behind the grip portion, and the tip surface is formed at the tip of the barrel. There is a type which is mounted while being clamped by an installed base member (tip member). Usually, the base member is removably provided at the tip of the shaft cylinder by screw fitting or the like, and is screw-fitted so that the grip is compressed in a direction along the axis.

[0004]

In such a tip member which is detachably mounted on the distal end of the barrel by screw fitting or the like, the screw fitting or the like may be loosened for various reasons. As described above, in the case of the structure arranged at the tip of the barrel so as to compress the grip, even if the screw fitting is loosened a little, there is no large gap between the tip member and the grip, so that it is loose. It is hard to understand. If the tip of the ballpoint pen refill stored in the shaft cylinder is loosened or loosened due to external factors such as vibration if it is still inserted in the pocket etc. Touch it,
If the pockets, etc. are soiled with ink or an impact is applied to the tip member, etc. in a state where the screw fitting between the tip member and the barrel is loose, it is provided at the tip of the barrel, which connects the barrel and the tip member. There is a problem that the connection portion and the tip of the barrel are broken.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and a grip is held by a tip member provided at the tip of a barrel by screw fitting or press-fitting. In the shaft barrel of the writing instrument attached to the above, the tip member is fixed to the tip of the barrel.

[0006]

According to a first aspect of the present invention, there is provided a writing instrument having a shaft barrel provided with a grip formed of a soft elastic material made of rubber or synthetic resin at a tip end of the barrel at least at a grip portion of the barrel. A writing instrument barrel clamped by a tip member,
A small-diameter connection cylinder fitted into the tip member provided at the tip of the shaft cylinder is provided with a plurality of cutouts opened at the tip so that the tip of the connection cylinder can be reduced in diameter. An engaging projection having an inclined wall surface and an upright wall surface on the rear end side is provided, and an engaging wall portion is provided on an inner wall surface of the tip member to abut the engaging projection portion. When the connection tube is mounted on the connection member, the connection tube enters the inside of the tip member, the inclined surface of the engagement protrusion of the connection tube comes into contact with the engagement wall portion of the front member, and the connection tube is reduced in diameter. The fitting is completed by expanding the diameter beyond the joint wall to the original state, and the upright surface of the engaging projection is engaged with the engaging wall for movement of the tip member which is going to be detached from the tip of the barrel. This is a structure in which the tip member is fixed to the tip of the barrel, which is prevented by contacting the end surface of the portion.

[0007] Alternatively, there is provided a shaft cylinder of a writing implement in which a grip formed of a soft elastic body made of rubber or synthetic resin is held at least at a grip portion of the shaft cylinder with a tip member provided at the tip of the shaft cylinder. A plurality of cutouts opened at the rear end are provided in a small-diameter connection cylinder fitted in a shaft cylinder provided at the rear end of the front member, and the rear end of the connection cylinder can be reduced in diameter. At the end, an engaging projection is provided with a rear end wall surface as an inclined surface and a front end wall surface as an upright surface, and an engaging wall portion abutting the engaging projection on the inner wall surface of the barrel is provided. Upon mounting of the member on the tip of the barrel, the connecting barrel enters the barrel, the inclined surface of the engaging projection of the connecting barrel abuts against the engaging wall of the barrel, and the connecting barrel is reduced in diameter. When the engagement projection is expanded beyond the engagement wall to return to the original state, the fitting is completed. Elevation is formed by blocking by abutting the end surface of the engaging wall portion, a structure fixing the above member to the distal end of the shaft tube.

In the barrel of the writing instrument according to the present invention, a connection cylinder provided at the front end of the barrel or at the rear end of the tip member is fitted into the tip member or the barrel. Or press-fitting. Further, the tip member may be made of either metal or synthetic resin. The barrel may be composed of a front shaft and a rear shaft and connected by screwing or the like. Further, the grip may be mounted on the entire barrel.

[0009]

Embodiments of the present invention will be described with reference to the drawings. The barrel 1 of the writing instrument according to the first embodiment shown in FIGS. 1 to 3 is a barrel of a knock-type writing instrument, and the description of the internal mechanism is omitted. The main barrel 1 includes a front shaft 2 and a rear shaft 3. The rear end 3a of the rear shaft 3 is open for a knock body (not shown) to protrude outward.
The outer diameter of the front shaft 2 is formed smaller than the outer diameter of the rear shaft 3,
A connection cylinder 6 having a small diameter and having a male screw portion 5 for screwing into the tip member 4 is formed at the distal end. The rear end portion 2a of the front shaft 2 is provided with a ring-shaped protruding portion 7. Immediately behind the protruding portion 7, the outer diameter of the tip of the rear shaft 3 abutting on the protruding portion 7 is provided. A ring 8 having the same outer diameter as that of FIG. The rear end 2a of the front shaft 2 is integrated with the front end of the rear shaft 3 by screw fitting 9, and the ring 8 is held between the projection 7 and the front end surface of the rear shaft 3. The outer diameter of the projection 7 is smaller than the outer diameter of the ring 8.

A grip 10 made of silicone rubber is inserted into the front shaft 2, and a rear end 10 a of the grip 10 is brought into contact with the ring 8. The total length L of the grip 10 is
The length of the front shaft 2 in front of the ring 8 is slightly longer than the length M excluding the length of the connecting cylinder 6.

The connecting cylinder 6 of the front shaft 2 is provided with two notches 11 which are open at the tip at two opposing positions.
Can be reduced in diameter. The distal end of the connection tube 6 is protruded from the distal end of the connection tube 6 so as not to come into contact with the female screw portion 12 of the tip member 4 corresponding to the male screw portion 5 of the connection tube 6 when screwed into the tip member 4. An engagement projection 15 is provided, in which the wall surface of the connection tube 6 is an inclined surface 13 and the rear wall surface is an upright surface 14 with respect to the axis of the connection cylinder 6. The engaging projection 1 is provided on the inner wall surface at the back in the direction in which the connection tube 6 enters from the female screw portion 12 of the tip member 4.
5 is provided with a ring-shaped engaging wall portion 16 that protrudes upright with respect to the axis of the connection cylinder 6 that abuts the upright surface 14 of the connection tube 5.

When the female screw portion 12 of the tip member 4 and the male screw portion 5 of the connection tube are screwed into each other, the connection tube 6 enters the inside of the tip member 4 and the inclined surface 13 of the engagement projection 15 of the connection tube 6 is raised. It comes into contact with the engaging wall portion 16 of the tip member 4. The connecting cylinder 6 is radially pressed by the inclined surface 13 of the engaging projection 15 abutting against the engaging wall 16, and the diameter thereof is gradually reduced. When the engagement projection 15 exceeds the engagement wall 16, the diameter of the connection cylinder 6 is expanded to the original state, and the screw fitting is completed. When the screw fitting is loosened and the tip member 4 moves away from the connecting cylinder 6 of the front shaft 2, the upright surface 14 of the engaging projection 15 comes into contact with the end surface 16 a of the engaging wall portion 16. The tip member 4 is fixed to the front end of the front shaft 2 without loosening the screw fitting.

FIG. 4 shows a shaft barrel 51 of a writing instrument according to the second embodiment, which has a female threaded portion 53 on the inner wall of the front end of a front shaft 52, and the front end of the front member 54 has the front shaft 54. A connection tube 56 having a male screw portion 55 to be screw-fitted to the female screw portion 53 of the connector 52 is provided. The front member 11 is arranged on the front shaft 52 by screw-fitting the male screw portion 55 of the connection tube 56 and the female screw portion 53 of the front shaft 52.

The connecting cylinder 56 is provided with two notches 57 which are open at the rear end at two opposing positions so that the rear end of the connecting cylinder 56 can be reduced in diameter. At the rear end of the connection tube 56, the front shaft 5
2, the engaging projection 1 according to the above-described embodiment, which projects so as not to come into contact with the female screw portion 53 of the front shaft 52 when screwed into
5, an engagement projection 60 is provided in which the rear wall surface is an inclined surface 58 and the front wall surface is an upright surface 59 with respect to the axis of the connecting cylinder 56. Female thread 53 of front shaft 52
The rear inner wall is formed upright in the same manner as the engaging wall portion 16 of the above-described embodiment, which is in contact with the upright surface 59 of the engaging projection 60, and is upright with respect to the axis of the connection tube 56. A ring-shaped engaging wall portion 61 is provided to protrude so as to be able to abut.
Other structures are the same as those of the barrel 1 of the writing implement of the above-described embodiment.

The connection tube 56 of the tip member 54 is screwed into the front shaft 52, whereby the connection tube 56 enters the inside of the front shaft 52, and the inclined surface 58 of the engaging projection 60 of the connection tube 56 is 52
Abuts on the engaging wall portion 61 of the main body. The connection cylinder 56 is
The 0 inclined surface 58 is pressed by the engaging wall 61, and the diameter gradually decreases. When the engagement protrusion 60 exceeds the engagement wall 61, the diameter of the connection tube 56 is expanded to the original state, and the screw fitting is completed. The movement in which the screw fitting is loosened and the tip member 54 is separated from the front shaft 52 is prevented by the upright surface 59 of the engaging projection 60 contacting the end surface 61a of the engaging wall portion 61 of the front shaft 52. Therefore, the screw fitting is not loosened, and the tip member is fixed to the tip of the barrel.

FIG. 5 shows a barrel 101 of a writing instrument according to the third embodiment. At the tip of the front shaft 102, a tip member 10
3 is provided with a connection cylinder 105 having a press-fit portion 104 for press-fitting. The connection tube 105 is provided with two notches 106, which are open at the front end, at two opposing positions, so that the front end of the connection tube 105 can be reduced in diameter. A small-diameter portion 107 having a diameter smaller than that of the press-fit portion 104 is formed at the distal end of the connection tube 105. The small-diameter portion 107 is formed by connecting the opened front wall surface to the inclined surface 108 and connecting the rear wall surface. An engagement protrusion 110 is provided as an upright surface 109 with respect to the axis of the cylinder 105. A ring-shaped engagement protruding upright with respect to the axis of the connection cylinder 105 is provided on the inner wall surface of the tip member 103 in the direction in which the connection cylinder 105 enters, and the upright surface 109 of the engagement protrusion 110 abuts. A joint wall 111 is provided. Other structures are the same as those of the barrel 1 of the writing implement of the first embodiment described above.

By press-fitting the connecting cylinder 105 formed on the front shaft 102 into the tip member 103, the inclined surface 108 of the engaging projection 110 of the connecting cylinder 105 is engaged with the engaging wall 1 of the tip member 103.
11, the small-diameter portion 107 of the connection tube 105 is pressed in the radial direction, and gradually decreases in diameter. When the engagement protrusion 110 exceeds the engagement wall 111, the diameter of the connection tube 105 is expanded to its original state, and the entry is completed. When the tip member 103 moves away from the connection cylinder 105 of the front shaft 102,
The upright surface 109 of the engaging projection 110 is stopped by contact with the end surface 111a of the engaging wall portion 111, and the tip member 103 is stopped.
Is fixed to the front end of the front shaft 102.

FIG. 6 shows a shaft 151 of a writing instrument according to the fourth embodiment. At the rear end of the tip member 152, the front shaft 1
A connection cylinder 155 having a press-fit portion 154 for press-fitting into the inside 53 is provided. At the rear end of the connection tube 155, cutouts 156 having openings at the rear end are provided at two opposing positions, so that the rear end of the connection tube 155 can be reduced in diameter. Connection tube 155
At the rear end, a small-diameter portion 15 having a smaller diameter than the press-fit portion 154 is provided.
The small diameter portion 157 has an open rear end side wall surface as an inclined surface 158 and a front end side wall surface as a connecting cylinder 15.
An engagement protrusion 160 is provided on the shaft 5 as an upright surface 159. The connecting cylinder 155 of the tip member 152 is
A ring-shaped engaging wall portion 161 protruding upright with respect to the axis of the connecting cylinder 155 is provided on the inner wall surface in the depth in the direction of entering the inner wall, with which the upright surface 159 of the engaging protrusion 160 abuts. It is. Other structures are the same as those of the barrel 1 of the writing implement of the first embodiment described above.

By press-fitting the connecting cylinder 155 formed on the tip member 152 into the front shaft 153, the inclined surface 158 of the engaging projection 160 of the connecting cylinder 155 is brought into contact with the engaging wall portion 16 of the front shaft 153.
1, the distal end portion of the connection tube 155 is pressed in the radial direction, and the diameter gradually decreases. When the engagement protrusion 160 exceeds the engagement wall 161, the diameter of the connection cylinder 155 is expanded to its original state, and the entry is completed. When the tip member 152 moves away from the front shaft 153, the upright surface 1 of the engagement projection 160 is moved.
The movement of the engagement member 59 is prevented by the contact of the end surface 161 a of the engagement wall portion 161, and the front member 152 is fixed to the front end of the front shaft 153.

The barrel 1, 51, 1 of the writing instrument according to the present embodiment is shown.
01 and 151 are integrated by screwing the front shafts 2, 52, 102 and 153 and the rear shaft 3,
A structure in which the front shaft and the rear shaft are integrally formed without being separable may be used. Further, although the rear end of the grip 10 is supported at the front end of the rear shaft 3 via the ring 8, the rear end of the grip 10 may be directly supported at the front end of the rear shaft 3.

[0021]

As described above, in the barrel of the writing instrument according to the present invention, the tip member for holding the grip is fixed to the tip of the barrel, so that the tip member moves in the direction to come off from the tip of the barrel. There is no detachment from the barrel. Therefore, no impact is applied to the tip member or the tip of the barrel when the tip member is separated from the tip of the barrel, and there is no danger of cracking or cracking at the tip of the barrel. Also, in the case of a knock-type writing instrument barrel, the tip member does not come off from the tip of the barrel when inserted in a pocket or the like, so it is stored in the barrel due to the detachment of the tip member. There is no contact of the writing tip of the written ballpoint pen refill with the fabric of the pocket, and the fabric of the pocket does not become stained with ink.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shaft cylinder of a writing instrument without an internal mechanism according to a first embodiment of the present invention.

FIG. 2 is an exploded view showing a disassembled state of the barrel of the writing instrument according to FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a main part of a distal end portion of the shaft cylinder in FIG.

FIG. 4 is an enlarged cross-sectional view of a main part of a distal end portion of a shaft cylinder of a writing instrument according to a second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a main part of a distal end portion of a barrel of a writing instrument according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a distal end portion of a shaft cylinder of a writing instrument according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1, 51, 101, 151 Shaft tube 4, 54, 103, 152 Tip member 6, 56, 105, 155 Connection tube 10 Grip 11, 57, 106, 156 Notch portion 13, 58.108, 158 Inclined surface 14, 59 , 109.159 Upright surface 15, 60, 110, 160 Engagement projection 16, 61, 111, 161 Engagement wall

Claims (2)

[Claims] 1. A writing instrument shaft cylinder in which a grip formed of a soft elastic body made of rubber or synthetic resin is held at least on a gripping portion of the shaft cylinder by a tip member provided at the tip of the shaft cylinder. A small-diameter connection cylinder fitted into a tip member provided at the distal end of the shaft cylinder, a plurality of cutouts opened at the distal end are provided, and the distal end of the connection cylinder can be reduced in diameter. An engaging projection having a front-end wall surface as an inclined surface and a rear-end wall surface as an upright surface is provided, and an inner wall surface of the front member is provided with an engaging wall portion abutting the engaging protrusion, and a shaft cylinder of the front member is provided. At the time of attachment to the tip of the connection tube, the connection tube enters the inside of the tip member, the inclined surface of the engagement projection of the connection tube comes into contact with the engagement wall portion of the front member, and the connection tube is reduced in diameter. The fitting ends by expanding the diameter beyond the engagement wall to the original state,
The movement of the tip member from the distal end of the barrel is prevented by the upright surface of the engagement projection contacting the end surface of the engagement wall. A barrel for a writing instrument, which is fixed. 2. A writing-tool shaft barrel in which a grip formed of a soft elastic material made of rubber or synthetic resin is held at least at a gripping portion of the barrel by a tip member provided at the tip of the barrel. A plurality of cutouts opened at the rear end are provided in a small-diameter connection cylinder fitted in a shaft cylinder provided at the rear end of the front member, and the rear end of the connection cylinder can be reduced in diameter. At the end, an engaging projection is provided with a rear end wall surface as an inclined surface and a front end wall surface as an upright surface, and an engaging wall portion abutting the engaging projection on the inner wall surface of the barrel is provided. Upon mounting of the member on the tip of the barrel, the connecting barrel enters the barrel, the inclined surface of the engaging projection of the connecting barrel abuts against the engaging wall of the barrel, and the connecting barrel is reduced in diameter. The fitting ends when the engaging protrusions expand beyond the engaging wall to the original state, and the movement of the tip member trying to disengage from the tip of the barrel is
A shaft cylinder for a writing instrument, wherein a tip member is fixed to a tip of the shaft cylinder, the end member being prevented by an upright surface of the engagement projection contacting an end surface of the engagement wall portion.