JP2009297913A - Ballpoint pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ballpoint pen for giving soft writing feeling desired by a user. <P>SOLUTION: The outer periphery of the rear of a tip fixed part of a tip holder 9 is brought into press contact with a tip part inner wall of an axial cylinder 2 and when in non-writing state, the tip fixed part outer periphery and the tip part inner wall of the axial cylinder 2 are kept in non-contact state and when in writing state, the ballpoint pen tip is flexibly deformable to the axial cylinder 2 by writing pressure. A regulation part 42 which comes in contact with the outer periphery of the ballpoint pen tip 8 in writing to regulate the deflective deformation of the ballpoint pen tip 8 to the axial cylinder 2 is provided on the inner wall of a tip hole 41 of the axial cylinder 2. a straight inner surface 43 is provided on the tip part inner wall of the axial cylinder 2 in the rear of the regulation part 42. A press-contact part 91 coming in press-contact with the straight inner surface 43 to be slidable forward and backward is provided on the outer surface of the tip holder 9 in the rear of the tip fixed part. A control mechanism 12 for making the distance L1 between the regulation part 42 and the tip of the press-contact part 91 in the axial line variable is included. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a ballpoint pen. More specifically, the present invention relates to a ballpoint pen in which a ballpoint pen tip can bend and deform with respect to a shaft tube at the time of writing.

Conventionally, in this type of ballpoint pen, Patent Document 1 discloses a ballpoint pen feeler in which a metal ballpoint pen tip is secured to a synthetic resin tip holder and the tip holder is secured to the front portion of an ink containing cylinder, and In a ballpoint pen that is housed inside and has a shaft cylinder that projects the ballpoint pen tip from the tip hole, and the tip holder outer periphery is held in pressure contact with the inner wall of the tip end portion of the shaft cylinder, the outer periphery of the ballpoint pen tip fixing portion 91 of the tip holder And the tip end inner wall of the shaft cylinder are in a non-contact state, and the tip holder outer periphery behind the ballpoint pen tip fixing portion 91 is held in pressure contact with the tip end inner wall of the shaft cylinder. In addition, the shaft cylinder is composed of a front shaft and a rear shaft, and the front shaft has a ballpoint pen tip protruding at the tip. Provided with a inner wall of the tip hole and the chip holder outer periphery is pressed against to be, it is described that formed by screwed to the rear axle front.

Patent Document 2 discloses a ballpoint pen in which a ballpoint pen tip is attached to an ink accommodating cylinder via a chip holder in a shaft cylinder, and the ballpoint pen tip protrudes from a tip hole of the shaft cylinder. A ballpoint pen is described in which the tip holder is made of synthetic resin, the tip hole is penetrated in a straight shape, and the front portion of the tip holder is pressed against the inner wall of the tip hole.
Japanese Patent No. 3376450 Japanese Patent No. 3200722

The ballpoint pen of the above-mentioned patent document 1 has a certain soft writing feeling, but if the user wants a slightly harder writing feeling, or wants a slightly softer writing feeling, for example, It is not possible to freely adjust the amount of deformation of the tip with respect to the shaft tube in accordance with the preference and obtain a writing feeling with the desired softness. Further, in the ballpoint pen of Patent Document 1, when the front shaft and the rear shaft are loosened, the ballpoint pen tip rattles back and forth during writing, and the writing feeling of the desired softness cannot be properly maintained. .

In addition, the ballpoint pen of Patent Document 2 absorbs the dimensional variation in the axial direction of the ballpoint pen refill and reliably press-fits the ballpoint refill into the shaft tube, and the user can freely adjust the softness of the writing feeling. Have difficulty.

The present invention solves the above-mentioned conventional problems, and provides a ballpoint pen that allows a user to obtain a writing feeling with a softness desired by the user and that can appropriately maintain the writing feeling with a softness desired by the user. It is something to be offered. In the present invention, “front” refers to the ball-point pen side, and “rear” refers to the opposite side.

[1] The first invention of the present application is a ballpoint pen refill 7 in which a metal ballpoint pen tip 8 is fixed to a synthetic resin tip holder 9 and the tip holder 9 is fixed to a front portion of an ink containing cylinder 10; The ballpoint pen refill 7 is housed inside and the shaft cylinder 2 projects the ballpoint pen tip 8 from the tip hole 41, and the outer periphery behind the tip fixing portion 91 of the tip holder 9 is pressed against the inner wall of the tip portion of the shaft barrel 2. When not writing, the outer periphery of the chip fixing portion 91 and the inner wall of the tip end portion of the shaft tube 2 are in a non-contact state, and at the time of writing, the ballpoint pen tip 8 can be bent and deformed with respect to the shaft tube 2 by writing pressure. Then, the inner wall of the tip hole 41 of the shaft cylinder 2 is brought into contact with the outer periphery of the ballpoint pen tip 8 or the outer periphery of the chip fixing portion 91 of the chip holder 9 at the time of writing. A restricting portion 42 for restricting the amount of bending deformation is provided, a straight inner surface 43 is provided on the inner wall of the tip end portion of the shaft cylinder 2 behind the restricting portion 42, and the straight shape is provided on the outer wall of the chip holder 9 behind the chip fixing portion 91. It is a requirement that a pressure contact portion 92 that is slidably pressed in contact with the inner surface 43 in the front-rear direction is provided, and that an adjustment mechanism 12 that makes the axial distance L1 between the restriction portion 42 and the tip of the pressure contact portion 92 variable is provided. .

In the ballpoint pen 1 according to the first aspect of the present invention, the adjustment mechanism 12 that makes the axial distance L1 between the restriction portion 42 and the distal end of the pressure contact portion 92 variable is provided. By adjusting the axial distance between 42 and the tip of the pressure contact portion 92, the amount of bending deformation of the ball-point pen tip 8 with respect to the shaft tube 2 at the time of writing can be freely adjusted according to preference, and the writing feeling of the desired softness Can be obtained.

In the ballpoint pen 1 of the first invention, for example, when the user operates the adjustment mechanism 12 to set the axial distance L1 between the restricting portion 42 and the distal end of the press contact portion 92 to be relatively short, the press contact portion 92 The range of bending deformation with fulcrum as the fulcrum is set by the restricting portion 42 so that the ball-point pen tip 8 can be greatly bent and deformed with respect to the shaft tube 2, and a relatively soft writing feeling can be obtained during writing. In the ballpoint pen 1 according to the first aspect of the present invention, when the axial distance L1 between the restricting portion 42 and the distal end of the press contact portion 92 is set relatively long by operating the adjustment mechanism 12, the press contact portion 92 is used as a fulcrum. The range of the bent deformation is set relatively narrow by the restricting portion 42, and the ball-point pen tip 8 can be bent and deformed with respect to the shaft tube 2 so that a relatively hard writing feeling can be obtained at the time of writing.

In the first invention, the adjusting mechanism 12 that can change the axial distance L1 between the restricting portion 42 and the distal end of the press contact portion 92 includes, for example, the abutting portion 61 and the restricting portion 42 with which the ballpoint pen refill 7 abuts. The distance in the axial direction is variable, or the distance in the axial direction between the engaging portion of the outer wall of the ballpoint pen refill 7 that contacts the inner wall of the shaft cylinder 2 and the tip of the pressure contact portion 92 of the ballpoint pen refill 7 is variable. It is done.

[2] According to a second invention of the present application, in the first invention, a projecting body 11 for urging the ball-point pen refill 7 backward is provided in the shaft tube 2, and the outer wall of the ball-point refill 7 is provided on the inner wall of the shaft tube 2. A contact portion 61 that prevents the ballpoint pen refill 7 from moving backward is provided, and an axial distance L2 between the restriction portion 42 and the contact portion 61 can be changed by operating the adjusting mechanism 12. Is a requirement.

The ballpoint pen 1 according to the second aspect of the present invention is provided with the projectile 11 that urges the ballpoint refill 7 backward in the shaft tube 2, so that the user can always adjust the writing feeling to any softness. The contact state between the outer wall of the ballpoint pen refill 7 and the contact portion 61 of the inner wall of the shaft cylinder 2 is maintained, and the ballpoint pen tip 8 is prevented from rattling back and forth during writing, and the writing feeling of the desired softness is properly maintained. be able to.

The ballpoint pen 1 according to the second aspect of the present invention is provided with a contact portion 61 on the inner wall of the shaft cylinder 2 to contact the ballpoint refill 7 and prevent the ballpoint refill 7 from moving backward. By making the axial distance L2 between the portion 42 and the contact portion 61 variable, the longitudinal dimension of the shaft tube 2 becomes variable, so that the adjustment mechanism 12 can be operated easily.

In the ballpoint pen 1 of the second invention, for example, when the user operates the adjustment mechanism 12 to set the axial distance L2 between the restricting portion 42 and the contact portion 61 to be relatively short, The axial distance L1 between the portion 42 and the distal end of the pressure contact portion 92 is set to be relatively short. As a result, the range of bending deformation with the pressure contact portion 92 as a fulcrum is set relatively wide by the restricting portion 42, and the ball-point pen tip 8 can be greatly bent and deformed with respect to the shaft tube 2, so that a relatively soft writing feeling can be written. Is obtained. In the ballpoint pen 1 of the second invention, when the user operates the adjustment mechanism 12 to set the axial distance L2 between the restricting portion 42 and the contact portion 61 to be relatively long, A distance L1 in the axial direction between the restricting portion 42 and the distal end of the pressure contact portion 92 is set to be relatively long. Thereby, the range of the bending deformation with the pressure contact portion 92 as a fulcrum is set relatively narrow by the restricting portion 42, and the ball-point pen tip 8 can be bent and deformed with respect to the shaft tube 2 so as to have a relatively hard writing feeling during writing. can get.

[3] In the third invention of the present application, in the second invention, the shaft cylinder 2 is rotatable to the front member 3 provided with the front end hole 41 and the straight inner surface 43 and to the rear end of the front member 3. The front member 3 includes a rear member 6 to be screwed, and a contact portion 61 that contacts the outer wall of the ballpoint pen refill 7 and prevents the rearward movement of the ballpoint pen refill 7 is provided at the tip or inner wall of the rear member 6. A restricting portion 42 is provided on the inner wall of the tip hole 41 of the front end, and an elastic body 11 for biasing the ballpoint pen refill 7 rearward is provided in the front member 3. The adjusting mechanism 12 includes the front member 3, the rear member 6, By rotating the rear member 6 with respect to the front member 3, the rear member 6 is moved back and forth with respect to the front member 3, and the axial direction between the restriction portion 42 and the contact portion 61 The distance L2 is made variable.

The ballpoint pen 1 according to the third aspect of the present invention has a ballpoint pen refill 7 provided in the front member 3 so that the ballpoint pen can always be adjusted to any soft writing feeling by the user. The contact state between the outer wall of the refill 7 and the contact portion 61 of the inner wall of the shaft cylinder 2 is maintained, and the ball-point pen tip 8 is prevented from rattling back and forth during writing, and the writing feeling of the desired softness is properly maintained. Can do.

The ballpoint pen 1 according to the third aspect of the invention includes the adjusting mechanism 12 including a front member 3 and the rear member 6 that is rotatably screwed to a rear end of the front member 3. By rotating the front member 3, the rear member 6 is moved back and forth with respect to the front member 3, and the axial distance L2 between the restricting portion 42 and the contact portion 61 is variable. The longitudinal dimension of the shaft cylinder 2 becomes variable, and the operation of the adjusting mechanism 12 becomes easy.

In the ballpoint pen 1 according to the third aspect of the invention, for example, when the user operates the adjustment mechanism 12, the rear member 6 is moved forward with respect to the front member 3, and the shaft between the restriction portion 42 and the contact portion 61 is moved. When the distance L2 in the direction is set to be relatively short, the axial distance L1 between the restricting portion 42 and the tip of the pressure contact portion 92 is accordingly set relatively short. As a result, the range of bending deformation with the pressure contact portion 92 as a fulcrum is set relatively wide by the restricting portion 42, and the ball-point pen tip 8 can be greatly bent and deformed with respect to the shaft tube 2, so that a relatively soft writing feeling can be written. Is obtained. In the ballpoint pen 1 according to the third aspect of the invention, the user moves the rear member 6 rearward with respect to the front member 3 by operating the adjustment mechanism 12, so that the axial direction between the restricting portion 42 and the contact portion 61 is increased. When the distance L2 is set to be relatively long, the axial distance L1 between the restricting portion 42 and the distal end of the pressure contact portion 92 is accordingly set to be relatively long. Thereby, the range of the bending deformation with the pressure contact portion 92 as a fulcrum is set relatively narrow by the restricting portion 42, and the ball-point pen tip 8 can be bent and deformed with respect to the shaft tube 2 so as to have a relatively hard writing feeling during writing. can get.

In the present invention, the ballpoint pen tip 8 is a tip end of a tip body 81 made of a metal cylinder and rotatably holds a pen tip ball, and the ball holding portion is formed by plastic working or cutting. It is formed by. In the present invention, the ballpoint pen tip 8 is a part of the ballpoint pen tip 8 when the metal support barrel 82 that prevents the wobbling of the tip body 81 is fixed to the tip holder 9.

In the present invention, the outer periphery of the chip fixing portion 91 refers to the outer wall of the ball-point pen tip 8 on the outer periphery of the chip fixing portion 91 or the outer wall of the chip holder 9 on the outer periphery of the chip fixing portion 91.

In the present invention, the chip holder 9 is made of a synthetic resin (for example, polypropylene, polyacetal, etc.), and when the ball-point pen chip 8 is bent and deformed with respect to the shaft tube 2, the chip holder 9 is interposed between the chip fixing portion 91 and the pressure contact portion 92. It becomes elastically deformable. A ball-point pen tip 8 is fixed to the tip of the tip holder 9 by means such as press fitting. In the present invention, the press contact portion 92 is preferably formed integrally with the outer surface of the chip holder 9 made of synthetic resin.

In the present invention, the ink containing cylinder 10 contains the ink directly or the ink occlusion body impregnated with the ink. The ink containing cylinder 10 may be constituted by a separate member from the chip holder 9 or may be formed integrally with the holder 9.

In the present invention, it is preferable that the distal end portion of the shaft tube 2 including the restriction portion 42, the distal end hole 41, and the straight inner surface 43 is made of metal. Thereby, at the time of writing, the bending deformation amount of the ball-point pen tip 8 can be reliably regulated regardless of the magnitude of the writing pressure. In the present invention, the shaft cylinder 2 is composed of two detachable members (for example, a front member and a rear member that are detachably screwed, or a front shaft and a rear shaft), so that the ballpoint pen refill 7 is provided inside. Can be accommodated interchangeably.

In the present invention, the tip hole 41 is provided at the tip of the shaft tube 2, and the ball-point pen tip 8 of the ball-point pen refill 7 protrudes therefrom.

In the present invention, the straight inner surface 43 is provided on the inner wall of the tip end portion of the shaft tube 2, for example, a structure provided on the inner surface of the tip hole 41 of the shaft tube 2, or a shaft tube behind the tip hole 41. 2 is provided on the inner wall of the tip. In the present invention, the straight inner surface 43 refers to an inner surface having the same inner diameter in the axial direction.

In the present invention, the restricting portion 42 may be provided on any inner wall of the tip hole 41. For example, a configuration provided on the inner periphery of the tip opening of the tip hole 41 or a configuration provided on an intermediate portion of the inner wall of the tip hole 41. Is mentioned. The restricting portion 42 is formed at least in front of the straight inner surface 43.

The bullet body 11 may be anything that urges the ballpoint pen refill 7 rearward, and examples thereof include a coil spring and an elastic body.

The ballpoint pen of the present invention can obtain a writing feeling with a softness desired by the user.

1 to 4 show an embodiment of the present invention.
The ballpoint pen 1 of the present embodiment includes a ballpoint pen refill 7 and a shaft cylinder 2 that accommodates the ballpoint pen refill 7 therein.

The ballpoint pen refill 7 includes a ballpoint pen tip 8, a tip holder 9 to which the rear end of the ballpoint pen tip 8 is fixed, and an ink containing cylinder 10 to which the rear end of the tip holder 9 is fixed.

Ballpoint Pen Tip The ballpoint pen tip 8 includes a tip body 81 made of a metal (for example, stainless steel) cylinder and a support cylinder 82 made of a metal (for example, stainless steel or brass). The tip body 81 has a tip edge portion and a ball receiving seat (ball holding portion) formed at the tip portion by inward pressure deformation (plastic processing), and a pen tip ball is rotatably provided at the tip portion. Be embrace. The support cylinder 82 includes a small-diameter front portion and a large-diameter rear portion, the small-diameter front portion surrounds the outer surface of the chip body 81, and the large-diameter rear portion is on the outer peripheral surface of the tip portion of the chip holder 9. Press fit. The support cylinder 82 prevents the chip body 81 and the chip holder 9 from wobbling.

Chip holder The chip holder 9 is a cylindrical body obtained from a synthetic resin (for example, polypropylene) molded body. A mounting hole (chip fixing part 91) is formed at the tip of the chip holder 9, and the rear end of the chip body 81 is press-fitted and fixed into the mounting hole. A support cylinder 82 is press-fitted and fixed to the outer peripheral surface (chip fixing portion 91) of the tip holder 9.

A pressure contact portion 92 is integrally formed on the outer surface behind the mounting hole of the tip holder 9 so as to be in pressure contact with the straight inner surface 43 of the inner wall of the tip end portion of the shaft tube 2. In the present embodiment, the press contact portion 92 is formed by a plurality of ribs extending in the axial direction. In addition, the press contact portion 92 may be an annular smooth surface, an annular protrusion, or a plurality of point-like protrusions arranged in a circumferential manner.

On the outer surface behind the pressure contact portion 92 of the chip holder 9, a locking wall portion 93 that can lock the rear end of the spring 11 (a projectile) is formed.

In the ink storage cylinder 10, ink (for example, water-based ink, oil-based ink) and a follower (for example, high-viscosity fluid) that moves forward as the ink is consumed are directly stored.

The shaft cylinder 2 includes a front shaft 4, a rear shaft 5 that is detachably screwed to the front shaft 4, and a tail plug 6 that is rotatably screwed to the rear shaft 5. In the present embodiment, the front shaft 4 and the rear shaft 5 serve as the front member 3, and the tail plug 6 serves as the rear member. By attaching and detaching the front shaft 4 and the rear shaft 5, the ballpoint pen refill 7 accommodated in the shaft cylinder 2 can be exchanged.

The front shaft 4 is made of metal (for example, stainless steel, brass, etc.). The front shaft 4 has a tapered outer surface.

A front end hole 41 is opened at the front end of the front shaft 4. A straight inner surface 43 is formed on the inner surface of the tip hole 41. A restricting portion 42 is formed in an annular shape on the inner peripheral edge of the tip hole 41.

On the inner wall of the front shaft 4 behind the straight inner surface 43, a locking step portion 44 that can lock the tip of the spring 11 is formed. A spring 11 (compression coil spring) is disposed between a locking step 44 on the inner wall of the front shaft 4 and a locking wall 93 on the outer wall of the ballpoint pen refill 7.

A female thread portion is formed on the inner surface of the rear end opening of the front shaft 4. The female screw part is detachably screwed with the male screw part on the outer surface of the front end part of the rear shaft 5.

A female screw cylinder 51 having a female screw part 51 a is fixed to the inner surface of the rear end opening of the rear shaft 5, and a male screw part 62 of the tail plug 6 is screwed into the female screw cylinder 51. In addition to this, the female screw 51 may be formed directly in the rear end opening of the rear shaft 5 without providing the female screw cylinder 51.

The tail plug 6 is made of metal or synthetic resin. The tail plug 6 includes a contact portion 61 provided at the tip, a male screw portion 62 formed at the rear of the corresponding contact portion 61, and an operation portion 63 formed at the rear of the male screw portion 62. The rear end of the ballpoint pen refill 7 is brought into contact with the contact portion 61 of the tail plug 6, and the rearward movement of the ballpoint pen refill 7 is prevented. The male screw portion 62 of the tail plug 6 is screwed with a female screw portion 51a (specifically, a female screw portion 51a of the female screw cylinder 51) on the inner surface of the rear end opening of the rear shaft 5. The operation portion 63 projects outward from the rear end of the rear shaft 5. The contact portion 61 is moved back and forth with respect to the shaft tube 2 by rotating the operation portion 63.

The spring 11 disposed between the locking step 44 of the inner wall of the front shaft 4 and the locking wall 93 of the outer wall of the ballpoint pen refill 7 always urges the ballpoint refill 7 backward. Thereby, the contact state between the contact portion 61 of the tail plug 6 and the rear end of the ballpoint pen refill 7 is maintained.

The ballpoint pen 1 of the present embodiment includes a ballpoint pen refill 7 in which a metal ballpoint pen tip 8 is fixed to a synthetic resin tip holder 9 and the tip holder 9 is fixed to a front portion of an ink containing cylinder 10, and the ballpoint pen. The shaft cylinder 2 accommodates the refill 7 and projects the ball-point pen tip 8 from the tip hole 41, and the outer periphery (that is, the pressure contact portion 92) behind the chip fixing portion 91 of the tip holder 9 is the tip of the shaft barrel 2. When pressed, the outer periphery of the tip fixing portion 91 and the inner wall of the tip end of the shaft tube 2 are brought into non-contact state during writing, and the ballpoint pen tip 8 is bent and deformed with respect to the shaft tube 2 by writing pressure during writing. It is possible.

The ball-point pen 1 of the present embodiment contacts the outer wall of the ball-point pen tip 8 (that is, the outer wall of the support tube 82) on the inner wall of the tip hole 41 of the shaft tube 2, and the amount of bending deformation of the ball-point pen tip 8 with respect to the shaft tube 2 is reduced. A restricting portion 42 for restriction is provided, a straight inner surface 43 is provided on the inner wall of the tip of the shaft cylinder 2 behind the restricting portion 42, and the straight inner surface 43 and the front-rear direction are provided on the outer wall of the chip holder 9 behind the chip fixing portion 91. The pressure contact portion 92 that is slidably pressed is provided.

Adjustment Mechanism The ballpoint pen 1 according to the present embodiment includes the adjustment mechanism 12 that makes the axial distance L1 between the restriction portion 42 and the distal end of the pressure contact portion 92 variable. Specifically, the adjusting mechanism 12 is provided that makes the axial distance L2 between the restricting portion 42 and the contact portion 61 variable. In the present embodiment, the axial distance between the front end of the pressure contact portion 92 of the ballpoint pen refill 7 and the rear end (locking portion) of the ballpoint pen refill 7 that contacts the contact portion 61 of the tail plug 6 is constant (ie, Unchangeable).

The adjusting mechanism 12 includes a front member 3 (front shaft 4 and rear shaft 5) having a front end hole 41, a regulating portion 42, and a straight inner surface 43, and a rear member 6 (tail plug) screwed into the front member 3. ). By the operation of the adjusting mechanism 12 (the rotation operation of the operation portion 63 of the tail plug 6), the contact portion 61 moves back and forth with respect to the shaft tube 2, and the axial distance between the restriction portion 42 and the contact portion 61 is reached. L2 is variable, and accordingly, the axial distance L1 between the restricting portion 42 and the distal end of the press contact portion 92 is variable.

When soft writing feeling is obtained In the ballpoint pen 1 of the present embodiment, when the tail plug 6 is rotated with respect to the rear shaft 5, the tail plug 6 abuts by screwing the tail plug 6 and the rear shaft 5. The portion 61 moves forward, the axial distance L2 between the restricting portion 42 and the contact portion 61 is set to be relatively short, and accordingly, the axial distance L1 between the restricting portion 42 and the distal end of the press contact portion 92 is compared. Is set short. Thereby, the range of the bending deformation with the pressure contact portion 92 as a fulcrum is set relatively wide by the restricting portion 42, and the bending deformation amount of the ball-point pen tip 8 with respect to the shaft tube 2 is set large. As a result, a relatively soft writing feeling can be obtained during writing.

In the case of obtaining a hard writing feeling In the ballpoint pen 1 of the present embodiment, when the tail plug 6 is rotated with respect to the rear shaft 5 in the opposite direction, the tail plug 6 and the rear shaft 5 are screwed to each other. The abutting portion 61 of the stopper 6 moves rearward, and the axial distance L2 between the restricting portion 42 and the abutting portion 61 is set to be relatively long. Accordingly, the axial direction between the restricting portion 42 and the distal end of the press contact portion 92 is set. Distance L1 is set relatively long. Thereby, the range of the bending deformation with the pressure contact portion 92 as a fulcrum is set relatively narrow by the restricting portion 42, and the bending deformation amount of the ball-point pen tip 8 with respect to the shaft tube 2 is set small. As a result, a relatively hard writing feeling can be obtained during writing.

It is a longitudinal cross-sectional view of embodiment of the ball-point pen of this invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is the sectional view on the AA line of FIG. It is a principal part expanded sectional view which shows the state which the ball-point pen tip at the time of writing of FIG. 1 bent and deformed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Shaft cylinder 3 Front member 4 Front shaft 41 Front end hole 42 Restriction part 43 Straight inner surface 44 Locking step part 5 Rear shaft 51 Female thread cylinder 51a Female thread part 6 Rear member (tail plug)
61 Contact part 62 Male thread part 63 Operation part 7 Ball-point pen refill 8 Ball-point pen chip 81 Chip body 82 Support cylinder 9 Chip holder 91 Chip fixing part 92 Pressure contact part (rib)
93 Locking wall 10 Ink container 11 Bouncer (spring)
12 Adjustment mechanism L1 Axial distance L2 between the restricting portion and the distal end of the press contact portion Axial distance X between the restricting portion and the abutting portion

Claims (3)

A ballpoint pen refill in which a metal ballpoint pen tip is fixed to a synthetic resin tip holder and the tip holder is fixed to the front portion of the ink containing cylinder, and the ballpoint pen refill is accommodated inside and the ballpoint pen tip protrudes from the tip hole. The outer periphery of the tip holder of the tip holder is pressed against the inner wall of the tip end of the tip cylinder, and the outer periphery of the tip fixing portion and the inner wall of the tip end of the shaft cylinder are in a non-contact state when not writing. A ballpoint pen that can be bent and deformed with respect to the shaft cylinder by writing pressure during writing, and touches the inner wall of the tip hole of the shaft cylinder when touching the outer periphery of the ballpoint pen tip or the chip fixing part of the chip holder. And a restricting portion for restricting the amount of bending deformation of the ball-point pen tip with respect to the shaft tube is provided. An inner surface is provided, and a pressure contact portion that is slidably pressed against the straight inner surface in the front-rear direction is provided on the outer surface of the chip holder behind the chip fixing portion, and the axial distance between the restriction portion and the distal end of the pressure contact portion is variable. A ballpoint pen comprising an adjusting mechanism. An elastic body for urging the ballpoint pen refill rearward is provided in the shaft cylinder, and an abutting portion is provided on the inner wall of the shaft cylinder to contact the outer wall of the ballpoint pen refill and prevent the ballpoint pen refill from moving rearward. The ballpoint pen according to claim 1, wherein an axial distance between the restricting portion and the contact portion is variable by an operation. The shaft cylinder includes a front member having a front end hole and a straight inner surface, and a rear member that is rotatably screwed to the rear end of the front member, and a ball pen refill outer wall on the front end or inner wall of the rear member. An abutting portion that abuts and prevents the ball pen refill from moving backward is provided, a restricting portion is provided on the inner wall of the front end hole of the front member, and a resilient body that biases the ball pen refill backward is provided in the front member. The adjusting mechanism includes the front member and the rear member, and by rotating the rear member with respect to the front member, the rear member is moved back and forth with respect to the front member, and the regulating portion and the The ballpoint pen according to claim 2, wherein the distance in the axial direction from the contact portion is variable.

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