JP5923949B2 - Materials for writing instruments - Google Patents

Description

  The present invention relates to a writing instrument member having an inner shaft member and an outer cylinder member arranged so as to cover the inner shaft member.

Conventionally, it is well known that the inner shaft member (shaft cylinder) of a writing instrument is covered with a cylindrical or substantially cylindrical outer cylinder member such as a clip, a gripping member (grip), or a decorative ring. When an external force is applied, such as when carrying or carrying, the position of the outer cylinder member may be misaligned or may be slightly removed. Various proposals have been made to solve such badness.
An example of the structure is a clip (outer cylinder member) holding cylinder having a configuration in which a cut portion (split groove-shaped gap) continuous from one end to the other end is formed and elastically clamped and attached. (Japanese Utility Model Publication No. 2-19278 (Patent Document 1)).

  The holding cylinder of the clip (outer cylinder member) described in Patent Document 1 has an inner diameter smaller than the outer diameter of the shaft cylinder (inner shaft member (shaft body)) and is continuous from one end to the other end in the axial direction. It has a notch (split groove-shaped gap), and the shaft cylinder of the writing instrument is inserted into the holding cylinder, and is held by being elastically clamped. It is preventing.

No. 2-19278

  In the prior art described in Patent Document 1, the shaft tube (inner shaft member) does not have a restricting portion that hinders the movement of the holding tube of the clip (outer tube member). It is possible to move in the direction, and fixing only the elastic force of the cantilever tube may not be sufficient to prevent displacement and dropout. Even if a reduced diameter portion (concave portion) into which the holding cylinder fits is formed on the outer surface of the shaft cylinder (inner shaft member), the shaft cylinder (inner shaft member) or inner cylinder due to variations during production of the holding cylinder A gap is formed between the concave portion of the shaft member) and the end surface of the holding cylinder, the holding cylinder is displaced or dropped, and cannot be securely fixed, and the appearance is broken or in use. It can be considered that the writing instrument is troublesome.

The present invention is a writing instrument member having an inner shaft member and a metal outer cylinder member disposed so as to cover the inner shaft member, and the edge of the outer cylinder member is the inner shaft member. The protrusion is formed on the entire periphery of the edge or in at least two directions, and the protrusion is bitten into the inner shaft member.

The present invention is a writing instrument member having an inner shaft member and a metal outer cylinder member disposed so as to cover the inner shaft member, and the edge of the outer cylinder member is the inner shaft member. There are protrusions on the contact surface side, and the protrusions are formed in the entire circumference of the edge or in at least two directions, and the protrusions are bitten into the inner shaft member. It is possible to provide a writing instrument that does not bother the inside.

It is an external view of the whole product of 1st Example. It is an external view at the time of rotating 180 degree | times to the circumferential direction from the state of FIG. It is an external view at the time of rotating 90 degree | times to the circumferential direction from the state of FIG. It is a longitudinal cross-sectional view in the state of FIG. It is an enlarged view of the front member 4 periphery in FIG. It is the sectional view on the AA line in FIG. FIG. 7 is an enlarged view around a portion V in FIG. 6. FIG. 7 is an enlarged view around a W portion in FIG. 6. It is an external appearance perspective view of the axial cylinder main body 5 of 1st Example. It is an external appearance perspective view of the holding member 25 of 1st Example. It is a cross-sectional perspective view (partially enlarged view) of FIG. It is an enlarged view of the modification (projection 56) of a processus | protrusion. It is a figure showing the mounting method (before mounting) of the holding member 25 to the axial cylinder main body 5. FIG. It is an external view of the whole product of 2nd Example. It is an external view at the time of rotating 180 degree | times to the circumferential direction from the state of FIG. It is a longitudinal cross-sectional view in the state of FIG. It is an external appearance perspective view of the holding member 25 of 2nd Example. It is a cross-sectional perspective view (partially enlarged view) of FIG. It is an external view of the whole product of 3rd Example. It is an external view at the time of rotating 180 degrees in the circumferential direction from the state of FIG. It is a longitudinal cross-sectional view in the state of FIG. It is an external appearance perspective view of the axial cylinder main body 5 of 3rd Example. It is an external appearance perspective view of the holding member 25 of 3rd Example. FIG. 24 is a cross-sectional perspective view (partially enlarged view) of FIG. 23.

The operation will be described. The present invention is a writing instrument member having an inner shaft member and a metal outer cylinder member disposed so as to cover the inner shaft member, and the edge of the outer cylinder member is the inner shaft member. A protrusion on the contact surface side, and the protrusion is formed in the entire circumference of the edge, or in at least two directions, and the protrusion is bitten into the inner shaft member. Even if an external force is frequently applied due to catching on clothes, the outer cylinder member can be securely displaced, and the edge that is the starting point of dropping can be securely fixed. As a result, it is possible to provide a writing instrument in which the outer cylinder member is not displaced or dropped, and the appearance is not lost or inconvenienced during use.

  A first embodiment of the present invention will be described with reference to FIGS. In addition, below, the front member 4 side mentioned later is called the front, and the press member 17 side is called back. In this embodiment, the present invention is developed on a mechanical pencil. The present invention is not limited to a mechanical pencil, and can be applied to various writing instruments such as a ballpoint pen, a marker pen, a fountain pen, and a brush pen.

The shaft tube 1 includes a stainless steel pipe 2 at the front, a tip member 4 in which a core holding member 3 is press-fitted and fixed, and a shaft tube main body (inner shaft member) 5 disposed at the rear end of the tip member 4. A core feeding unit 6 having a core feeding mechanism is disposed inside the shaft cylinder 1. The shaft cylinder main body 5 is sandwiched between the tip member 4 and the core feeding unit 6, and as will be described later, by screwing the tip member 4 and the core feeding unit 6, the shaft cylinder body 5 is inserted. The main body 5 is fixed.
The lead feeding unit 6 has a lead tank 7 for storing a lead, and a relay member 8 is fixed to the front end of the lead tank 7 by press fitting. A chuck body 9 for holding and releasing the core L is fixed in front of the intermediate member 8 by press fitting, and a chuck ring 10 for opening and closing the chuck body 9 surrounds the chuck body 9. It is arranged in the state. Further, an intermediate screw member 11 is disposed so as to enclose the intermediate member 8, the chuck body 9, and the chuck ring 10. The positioning of the middle screw member 11 is performed by contacting the stepped portion 12 formed inside the front of the middle screw member 11 with the rear end surface of the chuck ring 10 and the large diameter portion formed behind the middle screw member 11. 13 is formed by a resilient member (coil spring) 15 stretched between the rear end of 13 and the front end of the reduced diameter portion 14 formed in front of the core tank 7. The elastic member 15 biases the chuck body 9, the relay member 8 and the core tank 7 to the rear of the shaft cylinder 1 when the core feeding unit 6 is disposed in the shaft cylinder 1. An eraser 16 and a pressing member 17 are detachably attached to the rear end of the lead tank 7.
Here, the fixing method of the axial cylinder main body 5 is explained in full detail. A female screw portion 18 is formed on the rear inner surface of the tip member 4, while a male screw portion 19 is formed on the outer surface of the reduced diameter portion 14 of the middle screw member 11 in the core feeding unit 6. Yes. The shaft cylinder body 5 has a small-diameter portion 20 on the inner front surface thereof, and a step portion 21 is formed by the small-diameter portion 20. By positioning the stepped portion 21 of the shaft tube main body 5 and the front end of the large diameter portion 13 of the middle screw member 11, the core feeding unit 6 is positioned in the shaft tube body 5, By screwing the male screw portion 19 of the middle screw member 11 and the female screw portion 18 of the tip member 4 projecting from the shaft tube main body 5 until the tip member 4 and the shaft tube main body 5 come into contact with each other, the shaft The cylinder body 5 is fixed.
Reference numeral 22 denotes a metal clip attached to the upper part of the shaft cylinder main body 5. The clip 22 is fitted in a recess 23 formed on the rear side of the shaft body 5.

A reduced diameter portion (gripping portion) 24 is formed in the front portion of the shaft cylinder main body 5, and the reduced diameter portion (gripping portion) 24 has a metal cylindrical holding member (outer cylinder member) 25. Is installed. In this embodiment, the shaft body 5 is made of acrylonitrile styrene butadiene resin (ABS). However, the present invention is not limited to this, and the inner shaft body can be made of any material.
A circumferential protrusion 26 is formed in the front part of the reduced diameter portion 24 of the shaft cylinder body 5, and this circumferential protrusion 26 serves as a climbing step when the gripping member 25 is mounted. . Further, a trapezoidal portion (trapezoidal portion 27) that protrudes in the forward direction of the shaft tube 1 is formed at the rear portion of the reduced diameter portion 24 of the shaft tube main body 5, and this shaft tube side trapezoidal portion 27 is formed. Is larger than the diameter-reduced portion 24.

Next, the cylindrical holding member 25 made of the metal will be described in detail.
In the gripping member 25 of the present embodiment, a slit portion (cut portion) 28 continuous from the front end portion to the rear end portion is formed. The slit portion 28 is formed along the axial direction of the shaft cylinder 1 and is formed in a straight line having a uniform width from the front end portion to the rear end portion.
The edge portion 29 of the slit portion 28 is formed with a hook-shaped protrusion 30 that is convex on the contact surface side with the shaft cylinder body 5 and is inclined with respect to the edge portion 29 on the opposite side to the slit portion 28. The hook-shaped protrusion 30 bites into the outer surface of the shaft cylinder body 5 when the gripping member 25 is attached to the reduced diameter portion 24 of the shaft cylinder body 5 (FIGS. 6 and 7). For this reason, even when an external force is applied in a direction in which the slit portion 28 spreads out, the hook-shaped protrusion 30 is caught on the shaft cylinder main body 5, so that the displacement, dropout, and loosening of the gripping member 25 can be prevented. Moreover, since the grip member 25 cannot be easily removed from the shaft tube main body 5 with the above-described configuration, an accident such as accidental ingestion of the grip member 25 by a child is prevented.
Further, a notch 31 is formed in a trapezoidal shape at the rear end portion of the gripping member 25 (a trapezoidal notch 31), and the shape thereof corresponds to the trapezoidal portion 27 on the shaft tube 1 side. It has a shape.
Further, the gripping member 25 is formed with a plurality of through holes 34 having a shape in which the axial direction of the shaft cylinder is connected by a straight line (straight line portion 32) and the circumferential direction is connected by an arc (arc portion 33) (FIG. 10). The entire periphery of the edge 35 of the through hole 34 is convex on the contact surface side with the shaft cylinder body 5 and has a surface along the edge 35, that is, a protrusion perpendicular to the shaft cylinder body 5. 36 is formed, and the protrusion 36 bites into the shaft tube main body 5 when the gripping member 25 is attached to the shaft tube main body 5 (FIGS. 6 and 8). At this time, the protrusion 36a formed at the edge of the straight portion 32 of the through hole 34 can prevent the gripping member 25 from rotating in the circumferential direction against an external force in the circumferential direction (rotating direction). The protrusions 36b formed on the edge of the portion 33 can prevent displacement of the grip member 25 with respect to the axial direction (FIG. 11). Here, in the present embodiment, the protrusion 36 of the through hole 34 is formed with a surface along the edge 35 , that is, a surface perpendicular to the shaft cylinder body 5 (vertical surface 37). When the projection 36 bites into the shaft cylinder body 5, the shaft cylinder body 5 is also deformed so as to engage with the projection 36, and a vertical surface 38 is also formed on the shaft cylinder body 5 (FIG. 8). For this reason, when an external force is applied, the vertical surface 38 of the shaft tube body 5 is formed deep in the inner diameter direction of the shaft tube body 5, and the vertical surface 37 of the protrusion and the vertical surface 38 of the shaft tube body 5 are formed. Engagement is strengthened, and the effect of preventing displacement can be enhanced.
As described above, the protrusions 30 and 36 are formed on the edges 29 and 35 of the grip member 25 of the present embodiment on the contact surface side with the shaft cylinder main body 5 on the entire circumference thereof. When 25 is mounted so as to cover the reduced diameter portion 24 of the shaft cylinder body 5, the protrusions 30 and 36 bite into the shaft cylinder body 5. For this reason, even if an external force is frequently applied due to a user's finger or clothes being caught, the edges 29 and 35 that are the starting point of the displacement of the gripping member 25 and dropping off can be securely fixed. It is possible to prevent any displacement in the axial direction or the circumferential direction of the cylinder 1, and as a result, it is possible to provide a writing instrument that does not have a displacement or drop-off of the gripping member 25, and that does not break down in appearance or inconvenience during use. . In particular, the present invention is applied to a component such as the gripping member 25 that is subjected to the most external force during use of the writing instrument, is likely to be displaced or dropped, and has a large influence on the appearance deterioration or inconvenience during use. In this way, a greater effect can be obtained.

Here, the through hole 34 of the holding member 25 and the protrusion 36 formed in the through hole 34 will be described in detail.
The through holes 34 are arranged at four positions at equal intervals in the axial direction of the shaft cylinder (through hole group 39), and the through hole groups 39 are arranged at six positions at equal intervals in the circumferential direction of the gripping member 25. ing.
By arranging in this way, the through hole 34 comes into contact with the finger when gripping any position, and an anti-slip effect can be obtained. Furthermore, in the present embodiment, the marking 40 is provided at a plurality of locations of the gripping member 25, and the formation area (outer frame) per location of the marking 40 is defined by a straight line (straight line portion). 32) The shape is the same as that of the through-hole 34 in which the circumferential direction is connected by an arc (arc portion 33). More specifically, the groove 40 is formed at a predetermined interval in the inscription 40, and a plurality of the inscriptions 40 are formed so as to be arranged between the through holes 34, whereby a grip during writing is formed. Improves power (anti-slip force). Note that the shape and size of the through holes 34 and the arrangement thereof are not limited to those described in the present embodiment, and may be arbitrary.
Further, in this embodiment, the positions where the protrusions 30 and 36 are formed are the slit part (cut part) 28 continuous from the front end part to the rear end part and the edges 29 and 35 all around the through hole 34. Of course, other edge portions may be formed. As an example, it is possible to form protrusions in at least two different directions by providing it at the edge of the trapezoidal cut portion 31 formed at the rear end, and to prevent the displacement and dropping of the gripping member 25. Needless to say, you can. Further, the same effect can be obtained by forming the slit portion 28 continuous from the front end to the rear end in an irregular shape such as by forming a taper angle instead of a straight line or by forming a curve, and forming a protrusion on the edge.
Furthermore, the arrangement of the protrusions is not limited to the entire circumference of the edge, but various patterns such as a part where force is expected to be applied and a space provided at an interval are conceivable. The load applied to the shaft tube main body and the gripping member can be reduced. For example, like the projection 56 shown in FIG. 12, the projection may be provided intermittently or non-uniformly. Thus, by providing the protrusion 56 having a plurality of protrusions with respect to the edge of the through-hole 34, each protrusion (each protrusion) becomes a shaft cylinder body when the protrusion 56 bites into the shaft cylinder body 5. Since the contact surface in two directions can be formed with respect to 5, the engagement between the gripping member 25 and the shaft cylinder body 5 when an external force is applied is strengthened, and the gripping member 25 is prevented from being displaced and prevented from falling off. Thus, it is possible to provide a writing instrument that does not break down in appearance or troublesome during use.
Here, the height of the protrusion formed on the edge is sufficient to be able to bite into the shaft cylinder main body (inner shaft main body) 5 and be surely fixed, but is desirably about 0.01 mm to 0.1 mm in height. Is desirable. The reason for this is that when the gripping member (outer cylinder member) 25 is fixed, if the protrusion is lower than 0.01 mm, the bite is shallow, so that it cannot be sufficiently fixed to the shaft cylinder body 5 and the gripping is performed. There is a possibility that the member 25 is likely to be misaligned or dropped out. If it is higher than 0.1 mm, all the protrusions cannot bite into the shaft body 5 and cannot be fixed sufficiently. There is a possibility that problems such as deterioration of the appearance may occur without fitting into the shaft body 5. Further, when the gripping member (outer cylinder member) 25 is made of a resin material, since the protrusion is created by undercutting, if it is higher than 0.1 mm, there is a possibility that it cannot be produced according to the intended shape.
Regarding the shape of the protrusion, in addition to the shape of the protrusion described in the first embodiment, various protrusions having a tapered shape on both sides of the edge or a protrusion having a shape that can be easily bitten such as a conical protrusion are used. Can do. At that time, a higher effect can be obtained by selecting the shape of the protrusion depending on the position where the protrusion is disposed and the difference in material hardness between the outer cylinder member and the shaft cylinder main body.
In addition, in this embodiment, the metal gripping member (outer cylinder member) 25 is manufactured by pressing. When forming the outer frame and through-holes from the metal plate by manufacturing by pressing, protrusions can be formed at the edge by deforming the metal in the punching direction, thus improving productivity be able to. Further, when the outer frame and the through-hole are formed by press working in this way, since the R portion 57 is simultaneously formed on the outer surface side of the gripping member 25, the grip feeling is good and the finger when gripping is applied. Can reduce stress. In addition, a protrusion can be formed in the process of cutting, etc.

The gripping member (outer cylinder member) 25 is attached to the shaft cylinder main body 5 using a jig as follows. The jig 42 to be used is a cylindrical tube body in which a taper whose outer diameter increases toward the rear of the shaft tube main body 5 is formed (FIG. 13). The maximum outer diameter of the jig 42 is formed to be larger than the outer shape of the circumferential protrusion 26 of the shaft cylinder body 5, and the jig 42 can be attached to and detached from the front portion of the shaft cylinder body 5. Is formed.
When the gripping member 25 is mounted, first, the jig 42 is mounted on the front portion of the shaft tube main body 5 and the gripping member 25 is inserted from the front portion. Then, the grip member 25 receives a force in the outer diameter direction by the jig 42. As described above, since the force in the insertion direction of the grip member 25 and the force in the outer diameter direction are also received, the grip member 25 has a slit portion (cut portion) 28 that extends from the front end portion to the rear end portion. While being opened, the shaft cylinder body 5 is moved rearward. When the jig 42 is completely passed over the jig 42 and passed, the gripping member 25 is restored to its original shape by its restoring force, and is mounted in a state matching the diameter of the reduced diameter portion 24 of the shaft cylinder body 5. When the mounting is completed, the trapezoidal cut portion 31 on the gripping member 25 side and the trapezoidal portion 27 on the shaft tube 1 side come into contact with each other and are in an engaged state.
As described above, in the gripping member 25 of the present embodiment, in the process of mounting the gripping member 25 on the shaft cylinder body 5, a slit portion (cut portion) that extends continuously from the front end portion to the rear end portion of the gripping member 25. ) 28 is widened, and it can be mounted in a state in which the gripping member 25 is adapted to the gripping portion of the barrel body 5 by the elastic force (restoring force) of the gripping member 25.
By mounting as described above, due to the resilience of the gripping member 25, the protrusions 30 and 36 formed on the edge portions 29 and 35 of the gripping member 25 have a force in the direction of biting into the shaft cylinder body 5. Because it works, more secure fixation can be realized.
Further, in this embodiment, the gripping member 25 is provided with a slit portion 28 to give the gripping member 25 an elastic force, and is attached to and fixed to the shaft cylinder body 5. At this time, strong biting may always be applied to the shaft barrel main body 5 by fixing the gripping member 25 with elastic force, but in this embodiment, the gripping member (outer cylinder member) ) 25 so that it can bend. Also, in this embodiment, at first, the protrusion is lightly repelled so that the protrusion is lightly entrapped, and the gripping force during writing is used, and the protrusion is firmly engulfed to eliminate displacement and rotation during writing. It is possible to prevent excessive stress on the shaft cylinder other than at the time of writing, and prevent any deformation or breakage over time.
In this embodiment, when the gripping member 25 is attached to the shaft cylinder body 5, the position of the slit portion (cut portion) 28 continuous from the front end portion to the rear end portion of the clip 22 is It arrange | positions so that it may become a position which faces the clip main body 43 180 degree | times.

  Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is an example of a gripping member in which the shape, arrangement location, and number of through holes in the gripping member 25 are changed. In the following, description of the same configuration as in the first embodiment is omitted.

  Also in the present embodiment, a reduced diameter portion (gripping portion) 24 is formed in the front portion of the shaft tube main body 5, and the reduced diameter portion (gripping portion) 24 has a metal cylindrical holding member ( An outer cylinder member 25 is mounted. A trapezoidal shape portion (trapezoidal portion 27) protruding in the forward direction of the shaft tube 1 is formed at the rear portion of the reduced diameter portion 24 of the shaft tube main body 5.

The metal cylindrical holding member 25 in the present embodiment will be described in detail.
A plurality of rhombus-shaped through holes 44 are formed in the gripping member 25 of the present embodiment, and the entire periphery of the edge 45 of the through hole 44 is convex on the contact surface side with the shaft tube body 5, A protrusion 46 having a surface along the portion 45, that is, a surface perpendicular to the shaft cylinder main body 5 is formed. When the gripping member 25 is attached to the shaft cylinder main body 5, the protrusion 46 is Eat 5 Like the through-hole 44, by forming a rhombus shape having an edge 45 inclined in two directions with respect to the axial direction of the shaft cylinder, displacement of the grip member 25 with respect to an external force acting in the twisting direction is prevented. can do.
Also in the shape of the through hole 44 of the present embodiment, the grip member 25 is prevented from rotating in the circumferential direction with respect to an external force in the circumferential direction (rotation direction) or the axial direction, and the displacement of the grip member 25 in the axial direction is prevented. Needless to say, it is assumed that external force is applied in various directions at the same time in the case of a gripping member where external force is often applied even during use or outside of actual use such as touching the gripping member other than during writing. Therefore, by providing the protrusions in the direction of twist with respect to the axis, it is possible to enhance the effect of preventing the displacement of the gripping member 25 and the falling off.
Also in this embodiment, the slit portion (cut portion) 28 continuous from the front end portion to the rear end portion is linearly uniform from the front end portion to the rear end portion so as to be along the axial direction of the shaft tube 1. Is formed.
The edge portion 29 of the slit portion 28 is formed with a hook-shaped protrusion 30 that is convex on the contact surface side with the shaft cylinder body 5 and is inclined with respect to the edge portion 29 on the opposite side to the slit portion 28. The hook-shaped protrusion 30 bites into the outer surface of the shaft cylinder body 5 when the gripping member 25 is attached to the reduced diameter portion 24 of the shaft cylinder body 5. For this reason, even when an external force is applied in a direction in which the slit portion 28 spreads out, the hook-shaped protrusion 30 is caught on the shaft cylinder main body 5, so that the displacement, dropout, and loosening of the gripping member 25 can be prevented. Moreover, since the grip member 25 cannot be easily removed from the shaft tube main body 5 with the above-described configuration, an accident such as accidental ingestion of the grip member 25 by a child is prevented.
As described above, the protrusions 30 and 46 are formed on the edges 29 and 45 of the gripping member 25 of the present embodiment on the contact surface side with the shaft cylinder main body 5 on the entire circumference thereof. When 25 is mounted so as to cover the reduced diameter portion 24 of the shaft tube main body 5, the protrusions 30 and 46 bite into the shaft tube main body 5. For this reason, even if an external force is frequently applied due to the user's finger or clothes being caught, the edge portions 29 and 45 that are the starting point of the displacement of the gripping member 25 and dropping off can be securely fixed. It is possible to prevent any displacement in the axial direction or the circumferential direction of the cylinder 1, and as a result, it is possible to provide a writing instrument that does not have a displacement or drop-off of the gripping member 25, and that does not break down in appearance or inconvenience during use. . In addition, as in the case of the gripping member 25, the external force is most applied during the use of the writing instrument, and there is a risk of displacement or dropout, which has a great influence on the appearance deterioration or the troublesomeness during use. A greater effect can be obtained by applying the present invention.
In addition, a notch 31 is formed in a trapezoidal shape at the rear end of the gripping member 25 (a trapezoidal notch 31), and the shape corresponds to the trapezoidal part 27 on the shaft tube 1 side. It becomes the shape to do.

The through hole 44 of the grip member 25 will be described in detail.
The through-hole 44 is a combination of a row (through-hole group 47) arranged at four positions at equal intervals in the axial direction of the shaft cylinder and a row (through-hole group 48) arranged at three places at equal intervals in the axial direction. Three places are arranged at equal intervals in the circumferential direction.
By arranging in this way, a pattern can be formed in the state of the through-hole 44 that hits a finger depending on the location where the grip is held, and it is possible to cope with various gripping sense preferences of the user.
Furthermore, in this embodiment, the grip force (anti-slip force) during writing is improved by forming a knurled mark 49 on the grip member 25 so as to be disposed between the through holes 44. ing.

The attachment method of the grip member 25 to the shaft cylinder main body 5 is inserted by inserting the grip member 25 from the front of the shaft cylinder main body 5 as in the first embodiment, but is not limited to this method and is attached by any method. I can do it.
Also in the case of the grip member 25 of the present embodiment, the slit portion (cut portion) 28 of the grip member 25 is expanded in the process of mounting the grip member 25 on the shaft cylinder body 5, and the grip member 25 Mounting in a state suitable for the grip portion of the shaft cylinder main body 5 is possible by the resilience (restoring force). By mounting as described above, due to the resilience of the gripping member 25, the protrusions 30 and 46 formed on the edge portions 29 and 45 of the gripping member 25 have a force in the direction of biting into the barrel body 5. Because it works, more secure fixation can be realized.
Even in this embodiment, when the gripping member 25 is mounted on the shaft cylinder body 5, the position of the slit portion (cut portion) 28 continuous from the front end portion to the rear end portion of the clip 22 is It arrange | positions so that it may become a position which faces the clip main body 43 180 degree | times.

  In the case of the present embodiment, since the through-hole 44 has a rhombus shape, the angle of the finger when grasped and the inclination angle of the side of the rhomboid of the through-hole 44 with respect to the axial direction of the shaft tube are closer and more fit A feeling can be obtained. Further, for the reasons described above, the gripping force is easily transmitted to the protrusions, and the protrusions during writing can be further strengthened.

Finally, a third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the shape and location and number of the through holes in the grip member 25, the shape behind the grip member 25, and the shape behind the reduced diameter portion (grip portion) 24 of the shaft cylinder body 5 are changed. This is an example. In the following description, description of the same configuration as in the first and second embodiments is omitted.

  Also in the present embodiment, a reduced diameter portion (gripping portion) 24 is formed in the front portion of the shaft tube main body 5, and the reduced diameter portion (gripping portion) 24 has a metal cylindrical holding member ( An outer cylinder member 25 is mounted. A rear portion of the reduced diameter portion 24 of the shaft cylinder body 5 is formed so as to be orthogonal to the axial direction of the shaft cylinder 1, that is, parallel to the circumferential direction.

The metal cylindrical holding member 25 in the present embodiment will be described in detail.
In the gripping member 25 of the present embodiment, a plurality of rectangular through holes 51 having one side (long side 50) longer in the axial direction than the circumferential direction are formed, and the entire periphery of the edge 52 of the through hole 51 is formed. A protrusion 53 is formed which is convex on the contact surface side with the shaft cylinder main body 5 and has a surface along the edge 52, that is, a surface perpendicular to the shaft cylinder main body 5. When the member 24 is mounted on the shaft barrel body 5, the member 24 bites into the shaft barrel body 5. At this time, the protrusion 53a formed on the edge of one side (short side 54) orthogonal to the axial direction of the through hole 51 can prevent the displacement of the grip member 25 with respect to the axial direction. Like the hole 51, having a long side (long side 50) in the axial direction, the protrusion 53b provided on the edge of the long side 50 grips in the circumferential direction against an external force in the circumferential direction (rotation direction). The rotation of the member 25 can be prevented more reliably.
Also in this embodiment, a straight line having a uniform width from the front end portion to the rear end portion so that the slit portion (cut portion) 28 continuous from the front end portion to the rear end portion is along the axial direction of the shaft tube 1. It is formed in a shape. The edge portion 29 of the slit portion 28 is formed with a hook-shaped protrusion 30 that is convex on the contact surface side with the shaft cylinder body 5 and is inclined with respect to the edge portion 29 on the opposite side to the slit portion 28. The hook-shaped protrusion 30 bites into the outer surface of the shaft cylinder body 5 when the gripping member 25 is attached to the reduced diameter portion 24 of the shaft cylinder body 5. For this reason, even when an external force is applied in a direction in which the slit portion 28 spreads out, the hook-shaped protrusion 30 is caught on the shaft cylinder main body 5, so that the displacement, dropout, and loosening of the gripping member 25 can be prevented. Moreover, since the grip member 25 cannot be easily removed from the shaft tube main body 5 with the above-described configuration, an accident such as accidental ingestion of the grip member 25 by a child is prevented.
As described above, the protrusions 30 and 53 are formed on the edges 29 and 52 of the grip member 25 of the present embodiment on the contact surface side with the shaft cylinder main body 5 on the entire circumference thereof. When 25 is mounted so as to cover the reduced diameter portion 24 of the shaft tube main body 5, the protrusions 30 and 53 bite into the shaft tube main body 5. For this reason, even if an external force is frequently applied due to the user's finger or clothes being caught, the edge portions 29 and 52 that are the starting point of the displacement or dropping of the grip member 25 can be securely fixed. It is possible to prevent any displacement in the axial direction or the circumferential direction of the cylinder 1, and as a result, it is possible to provide a writing instrument that does not have a displacement or drop-off of the gripping member 25, and that does not break down in appearance or troublesome during use. . In addition, as in the case of the gripping member 25, the external force is most applied during the use of the writing instrument, and there is a risk of displacement or dropout, which has a great influence on the appearance deterioration or the troublesomeness during use. A greater effect can be obtained by applying the present invention.

The through hole 51 of the grip member 25 will be described in detail.
The through holes 34 are arranged at three equal intervals in the axial direction of the shaft cylinder (through hole group 55), and the through hole groups 55 are arranged at six equal intervals in the circumferential direction of the gripping member 25. ing.
By arranging in this way, sufficient fixation can be performed when an external force is applied in any circumferential direction. In the gripping member 25, the ratio of the sum of the long sides 50 of the through holes 51 is preferably 30% to 50% with respect to the length of the through holes in the axial direction. The reason is that when it is 30% or less, it cannot be sufficiently fixed with respect to the external force in the circumferential direction, and when it is 70% or more, a sufficient thickness cannot be obtained between the through holes in the axial direction, and between the through holes. This is because there is a possibility of deformation or breakage of the thin portion in the case.

The attachment method of the gripping member 25 to the shaft cylinder main body 5 is inserted and attached from the front of the shaft cylinder main body 5 as in the first and second embodiments. Can be installed with.
Also in the case of the grip member 25 of the present embodiment, the slit portion (cut portion) 28 of the grip member 25 is expanded in the process of mounting the grip member 25 on the shaft cylinder body 5, and the grip member 25 Mounting in a state suitable for the grip portion of the shaft cylinder main body 5 is possible by the resilience (restoring force). By mounting as described above, due to the resilience of the gripping member 25, the projections 30 and 53 formed on the edges 29 and 52 of the gripping member 25 are forced in the direction of biting into the shaft body 5. Because it works, more secure fixation can be realized.
Even in this embodiment, when the gripping member 25 is mounted on the shaft cylinder body 5, the position of the slit portion (cut portion) 28 continuous from the front end portion to the rear end portion of the clip 22 is It arrange | positions so that it may become a position which faces the clip main body 43 180 degree | times.

  In the case of the present embodiment, since the through hole 51 has a rectangular shape having a longer side 50 than the circumferential direction in the axial direction, the protrusion 53 can more reliably prevent the gripping member 25 from rotating, Productivity can be improved because the shape of the gripping member 25 is simplified.

As described above, was constructed the first to third embodiments, the addition to the through-hole and the protrusion shape can be various shapes, not gripping member only clips and decorative rings such as inner shaft member ( The present invention can be applied to a configuration in which the outer cylinder member is covered on the shaft cylinder.
In the first to third embodiments, the cylindrical outer cylinder member and the inner shaft member are shown. However, the outer cylinder member and the inner shaft member are not limited to a cylindrical shape, and are cylindrical. I just need it. For example, the outer cylinder member and the inner shaft member may be formed of a rectangular cylinder such as a triangular cylinder, a pentagonal cylinder, or an octagonal cylinder. In addition, the inner shaft member may be a shaft body instead of a cylindrical body. In either case, the edge formed on the outer cylinder member is provided with a protrusion on the contact surface side with the inner shaft member, and the protrusion is formed in the entire circumference of the edge or in at least two directions. By writing the protrusions into the inner shaft member, it is possible to provide a writing instrument that is free from dislocation or dropout of the components and has no appearance deterioration or inconvenience during use.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Pipe 3 Core holding member 4 Tip member 5 Shaft cylinder main body (inner shaft member)
6 core feeding unit 7 core tank 8 intermediate member 9 chuck body 10 chuck ring 11 intermediate screw member 12 step portion 13 large diameter portion 14 reduced diameter portion 15 elastic member (coil spring)
16 Eraser 17 Pressing member 18 Female screw part 19 Male screw part 20 Small diameter part 21 Step part 22 Clip 23 Recessed part 24 Reduced diameter part (gripping part)
25 Gripping member (outer cylinder member)
26 Circumferential protrusion 27 Trapezoidal part 28 Slit part (cut part)
29 Edge 30 Projection 31 Trapezoidal cut (cut)
32 Straight part 33 Arc part 34 Through hole 35 Edge 36 Projection 36a Projection 36b Projection 37 Vertical surface 38 Vertical surface 39 Through hole group 40 Marking 41 Groove part 42 Jig 43 Clip body 44 Through hole 45 Edge part 46 Projection 47 Through hole group 48 Through hole group 49 Mark 50 Long side 51 Through hole 52 Edge 53 Projection 53a Projection 53b Projection 54 Short side 55 Through hole group 56 Projection 57 R part

Claims (4)

A member for a writing instrument having an inner shaft member and a metal outer tube member disposed so as to cover the inner shaft member, the edge of the outer tube member being a contact surface with the inner shaft member A member for a writing instrument having a protrusion on the side, wherein the protrusion is formed in the entire circumference of the edge or in at least two directions, and the protrusion is bitten into the inner shaft member. The member for a writing instrument according to claim 1, wherein the outer cylinder member has at least one cut portion . The writing instrument member according to claim 1 or 2, wherein the outer cylinder member has at least one through hole. The member for a writing instrument according to any one of claims 1 to 3, wherein the outer cylinder member is a gripping member.

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