JP2007182049A - Writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing instrument which can improve a feeling of grip of a sleeve without making the sleeve, composed of an elastic soft material, slide with respect to a barrel. <P>SOLUTION: This writing instrument comprises the barrel in which a writing body is to be housed, and the sleeve which is mounted on the outer peripheral surface of the barrel and composed of the elastic soft material. A plurality of axially elongated ribs are formed on the outer peripheral surface of the barrel. A groove, into which the rib is to be fitted, is formed on the inner peripheral surface of the sleeve. Between the adjacent ribs, a void part is formed between the sleeve and the barrel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a writing instrument in which a sleeve made of an elastic soft material is attached to at least a gripping portion of a shaft cylinder that houses a writing body.

  Conventionally, many writing instruments of this type have been proposed and are commercially available in which a sleeve molded into a cylindrical body with an elastic resin material is attached to a gripping portion of a shaft cylinder. Among these, the one in which the sleeve of the elastic resin material is simply mounted on the outer peripheral surface of the shaft cylinder depends only on the elastic characteristics of the sleeve itself when it is gripped. Therefore, there is a problem that a sufficient gripping force absorbing effect or gripping feeling improving effect cannot be exhibited. Further, when the elastic resin material becomes harder with age, the effect is further reduced.

  On the other hand, for example, in the writing instrument described in Patent Document 1, a plurality of ridges extending in the axial direction are formed on the inner peripheral surface of the sleeve in order to improve the grip feeling, and the protruding ends of the ridges Is in contact with the outer peripheral surface of the shaft tube. As a result, a gap is formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the shaft tube. Due to the presence of the gap portion, when the sleeve is gripped, the sleeve can be deformed so as to be immersed in the gap portion, thereby improving the grip feeling.

  However, the writing instrument described in Patent Document 1 has a problem that the coupling force of the sleeve to the shaft tube is weak, and the sleeve moves relative to the shaft tube when gripped.

  On the other hand, in the writing instrument described in Patent Document 2, the peripheral wall of the sleeve is given a thickness, a plurality of axially penetrating voids are formed in the circumferential wall, and the voids are circumferentially formed. It is arranged.

  According to the writing instrument described in Patent Literature 2, when the sleeve is gripped, the outer peripheral surface of the sleeve is easily elastically deformed due to the presence of a plurality of voids in the sleeve peripheral wall. No deformation is generated on the inner peripheral surface of the sleeve, and therefore no slip occurs between the inner peripheral surface of the sleeve and the outer peripheral surface of the shaft tube.

  However, in the writing instrument described in Patent Document 2, the inner peripheral surface of the sleeve is simply in contact with the outer peripheral surface of the shaft cylinder, and the position is only maintained by the frictional force of the sleeve. There is a problem that it is impossible to completely prevent the shaft cylinder from slipping.

Japanese Utility Model Publication No. 63-60375 Japanese Patent No. 3464791

  This invention is made | formed in view of this subject, and it aims at providing the writing instrument which can improve the grip feeling of a sleeve, without a sleeve slipping with respect to a shaft cylinder.

In order to achieve the above object, the invention according to claim 1 of the present invention is a writing instrument comprising: a shaft cylinder that houses a writing body; and a sleeve that is attached to the outer peripheral surface of the shaft cylinder and is made of an elastic soft material. ,
A plurality of first engaging portions extending in the axial direction and projecting in the inner diameter direction are formed on the inner peripheral surface of the sleeve,
A second engagement portion that engages with the first engagement portion is formed on the outer peripheral surface of the shaft tube, and a gap portion is formed between the sleeve and the shaft tube between the adjacent first engagement portions. Is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the outer contour shape of the cross section of the sleeve is a non-circular polygon or more polygonal shape at least in a partial range in the axial direction. The first engaging portion is formed on an inner peripheral surface portion corresponding to the corner portion of the polygonal shape.

  According to a third aspect of the present invention, the outer contour shape of the cross section of the sleeve according to the second aspect is a triangular shape.

  The invention according to claim 4 is characterized in that the sleeve according to claim 2 has side portions and corner portions of the polygonal shape, the side portions have a small curvature, and the corner portions have a large curvature. And

  According to a fifth aspect of the present invention, the outer contour shape of the transverse section of the sleeve according to any one of the first to fourth aspects changes in accordance with the axial position in at least a partial range in the axial direction. It is characterized by that.

  According to a sixth aspect of the present invention, the outer contour shape of the cross section of the sleeve according to the fourth aspect of the invention changes such that the proportion of the side portion of the sleeve continuously increases from the front toward the rear. It is characterized by.

  The invention according to claim 7 is the one according to any one of claims 1 to 6, wherein the shaft tube includes a front shaft tube to which the sleeve is mounted, a rear shaft tube behind the front shaft tube, and The outer contour shape of the cross section of the rear barrel matches the outer contour shape of the rear end portion of the sleeve having a polygonal shape equal to or more than a non-circular triangle.

  According to an eighth aspect of the present invention, a clip is attached to the rear shaft cylinder according to the seventh aspect, and the clip is in a circumferential direction that coincides with a corner portion of a polygonal shape of a cross section of the sleeve and the rear shaft cylinder It is attached to a position.

  The invention according to claim 9 is characterized in that the second engaging portion of the shaft cylinder according to any one of claims 1 to 8 protrudes in an outer diameter direction from an outer peripheral surface of the shaft cylinder.

The invention according to claim 10 is a writing instrument comprising: a shaft tube; and a sleeve made of an elastic soft material, which is attached to the outer peripheral surface of the shaft tube.
One of a plurality of axially extending ribs and grooves is formed on the inner peripheral surface of the sleeve, and the other of the ribs and grooves that fit into one of the ribs and grooves is formed on the outer peripheral surface of the shaft cylinder. A gap is formed between the sleeve and the shaft tube between the adjacent ribs.

The invention according to claim 11 is a method for providing a cushioning effect to a writing instrument including a shaft tube and a sleeve made of an elastic soft material, which is attached to the outer peripheral surface of the shaft tube.
Forming a plurality of first engaging portions extending in the axial direction on the inner peripheral surface of the sleeve and projecting in the inner diameter direction;
Forming a second engagement portion that engages with the first engagement portion on the outer peripheral surface of the shaft tube;
A gap is formed between the sleeve and the shaft cylinder between the adjacent first engaging portions.

  According to the present invention, when the first engaging portion formed on the sleeve and the second engaging portion formed on the shaft tube are engaged with each other, the sleeve is not rotatable relative to the shaft tube. This prevents slippage in the rotational direction of the sleeve relative to the shaft.

  When the user grasps the grip portion of the writing instrument, the sleeve can be deformed so as to be immersed in the gap, so that the grip feeling can be improved. Further, the finger can be prevented from slipping by this deformation.

  According to invention of Claim 2-4, the said polygonal shape can be made into arbitrary things, However, If it is set as a triangular shape, it will be convenient according to the number of fingers generally hold | gripped. The polygonal shape can be composed of side portions and corner portions. The side portion has a small curvature, but need not be straight, and the corner portion has a large curvature, but need not be sharp.

  According to the fifth aspect of the invention, different gripping feelings are obtained according to the axial position to be gripped, and the user can select the axial position to be gripped so as to obtain a desired gripping feeling. .

  According to the sixth aspect of the present invention, it is possible to give the user a different gripping sensation according to the axial position, and further improve the design of the writing instrument.

  According to the seventh aspect of the present invention, the design of the writing instrument can be improved by aligning the sleeve with the portion of the shaft cylinder on which the sleeve is not mounted.

  According to invention of Claim 8, positioning with a clip, a sleeve, and a front shaft cylinder can be performed.

  According to the ninth aspect of the invention, the shape of the first engaging portion of the sleeve can be maintained by the second engaging portion, and the shape of the gap is supported by the second engaging portion of the shaft tube. It becomes possible to prevent the voids from being crushed by aging.

  According to the tenth aspect of the present invention, the sleeve is formed into the shaft tube by engaging either one of the rib or groove formed in the sleeve and the other of the rib or groove formed in the shaft tube. On the other hand, relative rotation is impossible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a writing instrument. In the figure, a writing instrument 10 includes a shaft cylinder 12. In this example, the shaft cylinder 12 includes a front cylinder 14, a rear cylinder 16, a metal barrel ring 15 interposed between the front cylinder 14 and the rear cylinder 16, and a front end of the front cylinder 14. It consists of a plurality of parts including a tip 18 to be connected and a tail plug 19 connected to the rear end of the rear barrel 16. However, the present invention is not limited to this, and the shaft cylinder 12 can be composed of any number of parts including one. Moreover, these several components are connected integrally, or are connected so that attachment or detachment is possible as needed. The front cylinder 14 is made of a hard resin such as polymethyl methacrylate (PMMA) or ABS resin that is harder than the sleeve 20 described later. The rear barrel 16 can also be made of the same material as the front barrel 14.

  In this example, the front barrel 14 has a smaller outer diameter than the rear barrel 16. At least the cross section of the front cylinder 14 corresponding to the gripping part basically has a perfect outer contour, and projects from the true outer contour in the outer diameter direction as an engaging portion extending in the axial direction. A plurality of ribs 12a (three in this example) are formed at equal intervals in the circumferential direction.

  The shaft cylinder 12 accommodates a writing body 30 for functioning as a writing instrument and a mechanism for driving the writing body. However, since a known mechanism can be applied, detailed description thereof is omitted here. .

  A sleeve 20 made of an elastic soft material is mounted on the outer side of at least a portion (particularly the front shaft tube 14) corresponding to the gripping portion of the shaft tube 12. The elastic soft material can be selected from synthetic rubber, thermoplastic elastomer, soft synthetic resin, and the like. The outer contour of the cross-section of the sleeve 20 is not a perfect circle, but a triangular shape corresponding to the number of fingers normally used for gripping a writing instrument, that is, the thumb, forefinger, and middle finger, and a deformed triangular shape. It has become. Specifically, the portion corresponding to each side of the outer contour of the triangle is a side portion 20a having a gentle curvature, and the portion corresponding to each vertex of the triangle is not sharp and has a large curvature. It is a corner portion 20b. All the corner portions 20b are on the locus of one perfect circle centered on the axis of the shaft cylinder 12, and therefore the radius of curvature of the corner portion 20b is the radius of the perfect circle. On the other hand, the radius of curvature of the side portion 20a is naturally larger than the radius of the perfect circle. The outer contour shape changes from the front to the rear gradually so as to gradually change from a circle to a deformed triangle, in other words, the proportion of the portion occupied by the side portion 20a gradually changes.

  In the corner portion 20b, a protruding portion 20c protruding in the inner diameter direction is formed in the axial direction on the inner peripheral surface side of the sleeve 20, and a groove 20d as an engaging portion extending in the axial direction is formed in the protruding portion 20c. The The groove 20d has such a dimension that the rib 12a of the shaft cylinder 12 can be fitted therein.

  The distal end portion of the sleeve 20 has a tapered shape, and is fitted in a recess 18 a formed in the tip tool 18.

  The outer contour of the rear barrel 16 may be formed so as to be continuous with the outer contour of the sleeve 20, thereby giving an overall sense of unity in design. Specifically, the outer contour of the rear barrel 16 gradually changes from a deformed triangle to a true circle from the front to the rear. As in the case of the sleeve 20, the portion corresponding to each side of the outer contour of the triangle of the rear barrel 16 is a side portion 16a having a gentle curvature, and the portion corresponding to each vertex of the triangle has a point. The corner portion 16b has a large curvature. A clip 22 is attached to the rear barrel 16, and the circumferential position of the clip 22 coincides with the circumferential position of one corner portion 16b and the corner portion 20a.

  When performing the mounting operation of the sleeve 20 to the shaft cylinder 12, the front shaft cylinder 14 is inserted from the rear end of the sleeve 20 after the distal end portion of the sleeve 20 is inserted into the recess 18 a of the tip tool 18. At this time, the rib 12a is inserted in alignment with the groove 20d of the sleeve 20. Then, the front end of the front barrel 14 is coupled to the rear end of the tip 18. By aligning the rib 12a and the groove 20d, the sleeve 20 can be easily assembled to the shaft cylinder 12.

  In the writing instrument configured as described above, the front end portion of the sleeve 20 is fitted in the recess 18a formed in the front tool 18, and the rear end portion is in contact with the metal cylinder ring 15, so that the shaft The direction is positioned. Further, the groove 20d on the inner peripheral surface of the sleeve 20 is fitted with the rib 12a on the outer peripheral surface of the front barrel 14, and is positioned in the circumferential direction. Therefore, the sleeve 20 does not rotate with respect to the shaft cylinder 12 and does not slip.

  Further, a gap 28 is formed between the sleeve 20 and the front cylinder 14 between the adjacent ribs 12a, 12a.

  Accordingly, when the user uses the writing instrument 10, if the finger is applied to the side portion 20 a of the sleeve 20 to hold it, the side portion 20 a is immersed in the gap portion 28 and deformed as shown in FIG. 5. In addition, the gripping force can be absorbed and the grip feeling can be improved. The deformation of the side portion 20a can prevent the finger from slipping.

  Since the adjacent side portion 20a and the adjacent gap portion 28 are separated by the rib 12a, the finger is automatically guided to the side portion 20a.

  In this example, when the position in the axial direction for gripping the sleeve 20 is changed, the grip feeling is different because the size of the side portion 20a differs in the axial position due to the change in the shape of the sleeve 20. Each user can write at a position where a desired grip feeling can be obtained.

  Since the corner portion 20b of the sleeve 20 has the rib 12a, the corner portion 20b is less likely to be deformed than the side portion 20a. Therefore, when the user desires a grip without cushioning properties, it is possible to write with the corner portion 20b placed on the finger.

  If the gap portion is made of an elastic soft material as in the past, the rib portion or the protruding portion of the elastic soft material is deformed over time, and the shape of the gap portion cannot be maintained. Accordingly, since the protruding portion 20c of the sleeve 20 is reinforced by the hard rib 12a that engages with the groove 20d, the shape retaining force is high. Further, a tension acts on the side portion 20a of the sleeve 20 by the rib 12a. Therefore, since the shape of the gap portion 28 is maintained, the durability can be increased.

  In the embodiment described, the sleeve is mainly mounted on the outer peripheral surface of the front shaft cylinder. However, the sleeve can be mounted on the outer peripheral surface of a portion of any shaft cylinder including the rear shaft cylinder. This is because the gripping portion is not necessarily a portion of the front barrel, and some users may grip the rear of the barrel. Moreover, the cushion effect can be given not only to the fingertip but also to the palm that holds the writing instrument.

  In the embodiment described above, a groove is formed in the sleeve and a rib is formed in the front shaft cylinder. However, the present invention is not limited to this configuration, and any engagement structure can be adopted. Further, a shaft may be formed on the shaft cylinder, and a rib may be formed on the sleeve.

It is a side view showing embodiment of the writing instrument which concerns on this invention. Although it is the whole longitudinal cross-sectional view of the writing instrument of FIG. 1, the internal structure is abbreviate | omitting illustration. It is sectional drawing seen along the 3-3 line of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure showing the use condition of FIG.

Explanation of symbols

10 Writing implement 12 Shaft cylinder 12a Rib (2nd engaging part)
14 Front barrel 16 Rear barrel 20 Sleeve 20a Side portion 20b Corner portion 20d Groove (first engaging portion)

Claims (11)

In a writing instrument comprising: a shaft tube that houses a writing body; and a sleeve that is attached to the outer peripheral surface of the shaft tube and is made of an elastic soft material.
A plurality of first engaging portions extending in the axial direction and projecting in the inner diameter direction are formed on the inner peripheral surface of the sleeve,
A second engagement portion that engages with the first engagement portion is formed on the outer peripheral surface of the shaft tube,
A writing instrument in which a gap is formed between a sleeve and a shaft tube between the adjacent first engaging portions.   The outer contour shape of the transverse cross section of the sleeve has a polygonal shape that is not less than a non-circular triangle in at least a partial range in the axial direction, and an inner peripheral surface corresponding to a corner portion of the polygonal shape. The writing instrument according to claim 1, wherein the first engaging portion is formed in the portion.   The writing instrument according to claim 2, wherein an outer contour shape of a cross section of the sleeve has a triangular shape.   The writing instrument according to claim 2, wherein the sleeve has side portions and corner portions of the polygonal shape, the side portions have a small curvature, and the corner portions have a large curvature.   The writing instrument according to any one of claims 1 to 4, wherein an outer contour shape of a transverse section of the sleeve changes in accordance with an axial position in at least a partial range in the axial direction.   5. The writing instrument according to claim 4, wherein the outer contour shape of the cross section of the sleeve changes such that a ratio of the side portion of the sleeve continuously increases from the front to the rear.   The shaft tube includes a front shaft tube to which the sleeve is mounted and a rear shaft tube behind the front shaft tube, and an outer contour shape of a cross section of the rear shaft tube is equal to or more than a non-circular triangle. The writing instrument according to any one of claims 1 to 6, which matches an outer contour shape of a rear end portion of the sleeve having a polygonal shape.   8. The writing instrument according to claim 7, wherein a clip is attached to the rear shaft cylinder, and the clip is attached to a circumferential position that coincides with a corner portion of a polygonal shape of a cross section of the sleeve and the rear shaft cylinder.   The writing instrument according to any one of claims 1 to 8, wherein the second engaging portion of the shaft tube projects in an outer diameter direction from an outer peripheral surface of the shaft tube. In a writing instrument comprising a shaft tube, and a sleeve made of an elastic soft material, mounted on the outer peripheral surface of the shaft tube,
One of a plurality of axially extending ribs and grooves is formed on the inner peripheral surface of the sleeve, and the other of the ribs and grooves that fit into one of the ribs and grooves is formed on the outer peripheral surface of the shaft cylinder. A writing instrument that is formed and a gap is formed between the sleeve and the shaft tube between the adjacent ribs. In a method for providing a cushioning effect to a writing instrument comprising a shaft tube and a sleeve made of an elastic soft material, mounted on the outer peripheral surface of the shaft tube,
Forming a plurality of first engaging portions extending in the axial direction on the inner peripheral surface of the sleeve and projecting in the inner diameter direction;
Forming a second engagement portion that engages with the first engagement portion on the outer peripheral surface of the shaft tube;
A method of forming a gap between a sleeve and a shaft tube between the adjacent first engaging portions.

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