JP2009184198A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil in which a turned-up phenomenon and a receding phenomenon hardly occur at the tip of a gripping part. <P>SOLUTION: In this writing utensil 1, a protruding piece 3a on the tip end side of the gripping part 3 is covered with a tip opening member 19, thereby reducing the occurrence of the tip turned-up phenomenon of the gripping part 3 and the receding phenomenon of the gripping part 3 that are caused by the catching of the fingers. These phenomena tend to occur particularly when an easily elastically deformable soft material is used for the gripping part 3. Therefore, the invention is particularly effective for the writing utensil 1 having a gripping part 3 composed of such a material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a writing instrument provided with a grip portion used as a slip stopper for fingers.

  Conventionally, there is JP-A-2005-47219 as a technology in such a field. The writing instrument described in this publication is provided with a grip portion at a grip portion, and the grip portion prevents slipping of the finger or improves adhesion to the finger. This improves the feeling of use of the writing instrument, and also reduces the fatigue of writing work for a long time. There are various materials for the grip portion made of an elastic body, such as materials that are difficult to deform even when pressed with a finger, and materials that are easily deformed with a finger.

JP-A-2005-47219

  When the grip portion used for the grip portion is formed of a material that is not easily elastically deformed, the tip of the grip is unlikely to turn up or retract due to contact with the finger. However, when the grip part is formed of a soft material that is easily elastically deformed, the tip of the grip is likely to be turned up or down due to the contact of the finger. However, there was a problem that the appearance and grip feeling of the grip portion were lost.

  It is an object of the present invention to provide a writing instrument that makes it difficult for the grip portion to be turned up and the grip portion to be retracted.

The writing instrument according to the present invention is a writing instrument in which a cylindrical grip portion made of an elastic body is attached to the outer periphery of the shaft cylinder.
On the distal end side of the grip portion, a projecting piece protruding in the axial direction of the shaft cylinder is provided, and on the outer peripheral surface on the distal end side of the shaft cylinder, a flat surface on which the projecting piece is placed is formed. It extends to the inside of the tip member attached so as to cover the tip of the shaft tube.

  In this writing instrument, the protruding piece provided on the tip side of the grip part extends to the inside of the tip member, so that the grip part tip-up phenomenon caused by finger catching and the grip part retreat The phenomenon is less likely to occur. Such a phenomenon is particularly likely to occur when a soft material that is easily elastically deformed is used for the grip portion, and is particularly effective for a writing instrument having a grip portion made of such a material.

Further, it is preferable that the flat surface is extended in the axial direction to the position corresponding to the grip portion on the outer peripheral surface of the shaft tube and is arranged at equal intervals in the circumferential direction of the shaft tube.
By extending the flat surface to a position corresponding to the grip portion, the flat surface also extends on the back surface side of the grip portion. Therefore, the thickness of the grip portion in the extended portion of the flat surface is set to the adjacent flat surface. It can be made thicker than the thickness of the grip portion between the extended portions of the surface. Thereby, the grip feeling of a grip part can be changed in the circumferential direction of a grip part.

In addition, it is preferable that the shaft tube and the grip portion are integrally formed by two-color molding.
When such a configuration is adopted, the adhesiveness between the shaft tube and the grip part and the adhesiveness between the flat surface of the shaft part and the protruding piece are improved, and the grip part is formed of a soft material that is easily elastically deformed. Even so, an excellent effect is exhibited such that the tip of the grip part is not turned up and the grip part is difficult to retract.

Further, it is preferable that the projecting piece is pressed against the flat surface of the shaft tube by the tip member.
In this case, the phenomenon that the tip of the grip portion is turned up and the grip portion is retracted more easily caused by the finger catching is less likely to occur, and the leading end member is less likely to be removed from the shaft tube due to the elastic deformation of the protruding piece.

  According to the present invention, the phenomenon of turning up the tip of the grip part and the phenomenon of retracting the tip of the grip part are less likely to occur.

  Hereinafter, preferred embodiments of a writing instrument according to the present invention will be described in detail with reference to the drawings. In the following description, the pen tip side is referred to as “front side”.

[Embodiment 1]
As shown in FIG. 1, the rotary multi-core writing instrument 1 has a shaft cylinder 2 composed of a front shaft 2a and a rear shaft 2b, and the front shaft 2a has a substantially conical tip member whose surface is plated. 19, a clip 2c is formed integrally with the rear shaft 2b, and the front shaft 2a and the rear shaft 2b rotate relatively. Further, a cylindrical grip portion 3 made of an elastic body is mounted on the outer periphery of the front shaft 2 a of the shaft tube 2. The grip portion 3 is made of a soft material that is easily elastically deformed (for example, thermoplastic elastomer (TPE)), and the front shaft 2a and the grip portion 3 are integrally formed by two-color molding.

  The shaft cylinder 2 accommodates two ballpoint pen type refills (for example, a refill containing red and black ink) 4a and a mechanical pencil type refill 4b. Each of the refills 4a and 4b is supported by a middle piece 6 accommodated in the shaft cylinder 2, and the middle piece 6 is connected so as not to rotate with respect to the front shaft 2a and rotates with respect to the rear shaft 2b. To be connected.

  Further, the middle piece 6 is formed with three insertion holes 6a into which the refills 4a and 4b are inserted, and guide grooves 6b extending rearward from the insertion holes 6a in the direction of the axis L. In each guide groove 6b, the slide piece 7 fixed to the rear end of each refill 4a, 4b slides. Each guide groove 6b is loaded with a compression spring 8 wound around the refills 4a, 4b. One end of the compression spring 8 is supported by the middle piece 6, and the other end of the compression spring 8 is provided by the slide piece 7. It is supported.

  Further, a support shaft portion 6 c that rotatably supports the cylindrical drive cam 9 is formed at the rear end of the middle piece 6. The drive cam 9 that rotates together with the rear shaft 2b around the support shaft portion 6c includes a cylindrical base portion 10 that is rotatably connected to the support shaft portion 6c inside, and an eraser that protrudes from the rear end of the base portion 10. 13 includes an eraser accommodating portion 11 that holds the cap 5, and a cam main body portion 12 that protrudes from the front end of the base portion 10 toward the distal end side of the shaft tube 2. The cam body 12 projects in a claw shape from the end of the base 10 and has a shape obtained by obliquely cutting a cylinder, and a chevron cam surface 12 a is formed along the contour of the cam body 12.

  On the other hand, each slide piece 7 which functions as a driven member of the drive cam 9 by the urging force of the compression spring 8 protrudes from the slide portion 15 sliding inside the guide groove 6b and the refill 4a. , 4b includes a pin-shaped refill loading portion 16 that is inserted into the rear end and a driven portion 17 that is formed integrally with the sliding portion 15 and has a triangular shape. The driven portion 17 is formed with a V-shaped driven surface 17 a that slides along the cam surface 12 a of the drive cam 9, and the top of the driven portion 17 enters the tip of the triangular cam body portion 12. A recess for locking the driven portion 17 is formed. Accordingly, when the drive cam 9 rotates together with the rear shaft 2b, any one of the tops of the slide pieces 7 selectively enters into the recesses of the cam main body 12, so that the refills 4a and 4b are rotated by the rotation of the rear shaft 2b. Any one of the tips can be projected from the tip of the shaft tube 2.

  In such a rotary multi-core writing instrument 1, the grip portion 3 attached to the outer periphery of the front shaft 2a of the shaft tube 2 is made of a soft material (for example, a thermoplastic elastomer (TPE)) that is easily elastically deformed, and is two-color molded. Thus, the front shaft 2a and the grip portion 3 are integrally formed. As a result, since the mutual adhesiveness is improved, the grip portion 3 is difficult to peel off from the front shaft 2a.

  As shown in FIGS. 2 and 3, the front shaft 2 a of the shaft cylinder 2 is loaded into the cylindrical front shaft main body portion 20 to which the grip portion 3 is attached and the rear shaft 2 b, so as to be opposed to the rear shaft 2 b. In order to attach a cylindrical connecting portion 21 that is rotatably connected to the middle piece 6 so as not to rotate, and a metallic decorative ring 18 (see FIG. 1), the connecting portion 21 is attached. The ring mounting portion 22 formed between the front shaft main body portion 20 and the metal-plated substantially conical tip member 19 are located inwardly and protrude from the front end of the front shaft main body portion 20. It is comprised from the conical expansion part 23. FIG.

  A flat surface S extending in the direction of the axis L is formed on the outer peripheral surface of the extended portion 23 of the front shaft 2a, that is, the front end portion of the front shaft 2a. A protruding piece 3a extending in the direction of the axis L is integrally provided, and the protruding piece 3a is bonded on the flat surface S by two-color molding. Since the adhesion between the flat surface S and the projecting piece 3a is improved by the two-color molding, the projecting piece 3a of the grip portion 3 is hardly peeled off from the flat surface S of the front shaft 2a.

  Regarding the molding, it is preferable that the primary side gate is provided in the approximate center of the flat surface S and the secondary side gate is provided in the approximate center of the protruding piece 3a. Regarding the product, the molding marks G1 and G2 of the gate can be hidden by the tip member 19, so that the appearance is improved. Moreover, the ring-shaped convex part 19b (refer FIG. 1) provided in the rear-end part of the internal peripheral surface 19a of the front-end | tip member 19 is not contacting the protrusion 3a.

  Further, a tip member 19 is attached so as to cover the extended portion 23 of the front shaft 2a and the protruding piece 3a, and the protruding piece 3a is bonded to the flat surface S. As a result, the phenomenon that the tip 3b of the grip portion 3 is turned up and the phenomenon that the tip 3b of the grip portion 3 is retracted is less likely to occur due to finger catching. Such a phenomenon is particularly likely to occur when a soft material (for example, thermoplastic elastomer (TPE)) that is easily elastically deformed is used for the grip portion 3, so that the writing instrument having the grip portion 3 of such a material is used. It is particularly effective.

[Embodiment 2]
The rotary multi-core writing instrument according to the second embodiment is different from the first embodiment only in the shape of the front shaft and the grip portion, and the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. To do.

  As shown in FIG. 5, in the rotary multi-core writing instrument 30, the grip portion 33 mounted on the outer periphery of the front shaft 32a of the shaft tube 32 is made of a soft material (for example, thermoplastic elastomer (TPE)) that is easily elastically deformed. The front shaft 32a and the grip portion 33 are integrally formed by two-color molding. As a result, mutual adhesiveness is improved, so that the grip portion 33 is hardly peeled off from the front shaft 32a.

  As shown in FIGS. 6 to 9, the front shaft 32 a of the shaft tube 32 is loaded in the front shaft main body portion 40 formed of a substantially hexagonal-shaped tube to which the grip portion 33 is mounted, and the rear shaft 2 b. In order to mount a cylindrical connecting portion 41 that is rotatably connected to the rear shaft 2b and that is connected so as not to rotate with respect to the middle piece 6, and a metallic decorative ring 18 (see FIG. 5). In addition, a ring mounting portion 42 formed between the connecting portion 41 and the front shaft main body portion 40 and a metal-plated substantially conical tip member 19 are positioned inward of the front shaft main body portion 40. It is comprised from the substantially cone-shaped expansion part 43 which protrudes from the front end.

  A flat surface S1 extending in the direction of the axis L is formed on the distal end portion of the shaft cylinder 32, that is, the outer peripheral surface of the extended portion 43 of the front shaft 32a, and the flat surface S1 is 3 at regular intervals in the circumferential direction of the extended portion 43. The three protruding pieces 33a extending in the axis L direction are integrally provided on the tip end side of the grip portion 33, and the protruding pieces 33a are bonded to each flat surface S1 by two-color molding. Has been. Since the adhesiveness between the flat surface S1 and the protruding piece 33a is improved by the two-color molding, the protruding piece 33a of the grip portion 33 is hardly peeled off from the flat surface S1 of the front shaft 32a. In addition, since the flat surfaces S1 are arranged at equal intervals in the circumferential direction, it is difficult for the tip 33b of the grip 33 to be turned up and the tip 33b of the grip 33 to be retracted due to finger catching. .

  Further, the tip member 19 is mounted so as to cover the extended portion 43 and the projecting piece 33a of the front shaft 32a, and the projecting piece 33a is adhered to the flat surface S1. As a result, the phenomenon that the tip 33b of the grip 33 is turned up and the phenomenon that the tip 33b of the grip 33 is retracted caused by finger catching is further less likely to occur. Such a phenomenon is particularly likely to occur when a soft material (for example, thermoplastic elastomer (TPE)) that is easily elastically deformed is used for the grip portion 33. Therefore, the writing instrument having the grip portion 33 of such a material is used. It is particularly effective.

  Further, a flat surface extension portion S2 extending in the direction of the axis L is formed on the outer peripheral surface of the front shaft main body portion 40 continuously with the flat surface S1. The flat surface S1 is extended in the direction of the axis L to a position corresponding to the grip portion 33 by the flat surface extension portion S2, and the flat surface extension portion S2 extends over substantially the entire length of the grip portion 33.

  As shown in FIG. 9, when the grip portion 33 having a circular cross section is applied, the thickness W1 of the grip portion 33 on the flat surface extension portion S2 is set to be equal to that of the grip portion 33 on the arc surface P between the flat surface extension portions S2. It can be made thicker than the wall thickness W2. Thereby, the grip feeling of the grip part 33 can be changed in the circumferential direction of the grip part 33 without increasing the outer diameter of the grip part 33.

  Further, considering that the grip portion 33 is gripped by the thumb, forefinger, and middle finger, three flat surface extensions S2 are arranged at equal intervals in the circumferential direction of the front shaft 32a, and the curvature of the arc surface P is further increased. And the curvature of the grip portion 33 are made substantially the same so that the grip feeling of the grip 33 does not change at this portion. When the front shaft 32a having such a shape is adopted, a person who grips the grip portion 33 strongly places each finger at the position of the flat surface extension portion S2, and a person who grips the grip portion 33 lightly holds each finger on the arc surface P. By placing it in the position, it becomes possible to write optimally according to the user's preference.

  It goes without saying that the present invention is not limited to the embodiment described above. For example, as shown in FIG. 10, in the writing instrument 50 according to another embodiment, the projecting piece 3a is formed by the ring-shaped convex portion 19b provided at the rear end portion of the inner peripheral surface 19a of the tip member 19. Is pressed against the flat surface S. In this case, the tip-up phenomenon of the tip of the grip part 3 and the retraction phenomenon of the grip part 3 caused by the finger catching are further less likely to occur, and due to the elastic deformation of the projecting piece 3a, the shaft member 2 to the tip member 19 Is difficult to escape. Note that similar changes can be made in the second embodiment. The present invention can also be applied to a knock-type writing instrument, and can be applied to a single core or a multi-core.

It is sectional drawing which shows 1st Embodiment of the writing instrument which concerns on this invention. It is a perspective view which shows the front shaft applied to 1st Embodiment. It is a perspective view which shows the state which removed the front-end | tip member from the front shaft. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which shows 2nd Embodiment of the writing instrument which concerns on this invention. It is a perspective view which shows the front axis | shaft applied to 2nd Embodiment. It is a perspective view which shows the state which removed the front-end | tip member from the front shaft. It is sectional drawing which follows the VIII-VIII line of FIG. It is sectional drawing which follows the IX-IX line of FIG. It is sectional drawing which shows other embodiment of the writing instrument which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,30,50 ... Writing instrument, 2,32 ... Shaft cylinder, 2a, 32a ... Front shaft, 2b ... Rear shaft, 3,33 ... Grip part, 3a, 33a ... Projection piece, 19 ... Front end member, 23, 43 ... extended portion (tip end portion of shaft barrel), S, S1 ... flat surface, S2 ... flat surface extension portion, L ... axis.

Claims (4)

In a writing instrument in which a cylindrical grip part made of an elastic body is attached to the outer periphery of the shaft cylinder,
On the tip side of the grip portion, a projecting piece protruding in the axial direction of the shaft cylinder is provided,
A flat surface on which the protruding piece is placed is formed on the outer peripheral surface on the tip side of the shaft tube,
The writing piece according to claim 1, wherein the protruding piece extends to the inside of a tip member attached so as to cover a tip portion of the shaft tube.   The flat surface is extended in the axial direction to the position corresponding to the grip portion on the outer peripheral surface of the shaft tube, and is arranged at equal intervals in the circumferential direction of the shaft tube. The writing instrument according to claim 1.   The writing instrument according to claim 1 or 2, wherein the shaft cylinder and the grip portion are integrally formed by two-color molding.   The writing tool according to any one of claims 1 to 3, wherein the protruding piece is pressed against the flat surface of the shaft tube by the tip member.

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