JP5024874B2 - Writing instrument cap - Google Patents

Description

  The present invention relates to a cap for a writing instrument in which a mounting portion of a head crown is mounted on a mounted portion formed at the tip of a cap body.

  2. Description of the Related Art Conventionally, a writing instrument cap is well known in which a mounting portion of a head crown is mounted on a mounting portion formed on a tip portion of a cap body. These writing instrument caps have various outer wall shapes, but the outer wall surface of the barrel and the inner wall of the cap are substantially the same in order to be detachably attached to the writing instrument body, so the inner wall shape has a cross-sectional shape. In general, the shape is a perfect circle.

In addition, the shape of the mounting part of the crown that is mounted on the tip of the cap body was also a circular shape in cross section. This is because it is easy to manufacture to have the same shape as the inner wall shape of the cap body, and there is no directionality when the head crown is worn, and assemblability is improved. And the like.
"Japanese Patent Laid-Open No. 2003-1989"

  However, if the shape of the mounting part of the head crown is a circular shape in cross section, there is a possibility that it will rotate after mounting. Repeated rotation of the crown after wearing may reduce the wearing force and cause the crown to come off, so it is necessary to increase the wearing force between the crown and the cap body in advance, resulting in poor assembly was there.

  An object of the present invention is to provide a cap of a writing instrument that can be easily worn without a head crown being easily detached, with a simple structure.

In order to achieve the above object, the present invention provides a writing instrument cap in which a mounting portion of a crown is mounted on a mounting portion formed at a tip portion of the cap body. The transverse section of the mounting portion has a long axis that has the longest perpendicular to the axis of the inner wall of the cap body in the longitudinal section , and a short axis that passes through the axis with respect to the long axis is shorter than the long axis. The fitting projection is formed on the outer wall on the long axis side of the mounting portion, the positioning projection is formed at a different location in the circumferential direction of the fitting projection, and the positioning projection The portion is formed on the rear end side of the crown from the fitting protrusion .

Furthermore, the projecting protrusions are formed at two different locations in the circumferential direction of the fitting projection.

  Furthermore, the cross-sectional shape of the mounted portion of the cap body and the mounting portion of the crown is substantially triangular.

  Furthermore, the fitting protrusion and the positioning protrusion are formed on different sides.

  In the present invention, the non-circular shape is a shape other than a regular circle, and the cross-sectional shape of the cap body mounting portion and the head crown mounting portion is perpendicular to the axis of the cap body. The shape having the longest major axis and the minor axis whose perpendicular to the major axis is shorter than the major axis is a substantially elliptical shape, a substantially trapezoidal shape, a substantially rectangular shape, a substantially triangular shape, or a combination of a plurality of shapes. A shape such as a shape.

  Since the writing instrument of the present invention has the structure as described above, the cap of the writing instrument that can be easily attached without easily removing the crown is provided with a simple structure.

  Embodiments of the present invention will be described with reference to the drawings. The same member and the same part are denoted by the same reference numerals.

Example 1
1 to FIG. 5, the cap 1 of the writing instrument according to the first embodiment is formed by integrally forming the clip member 3 on the outer wall of the cap body 2 and press-fitting and holding the seal member 5 that seals the pen tip portion inside the rib member. It is. The head crown 4 is formed with a through-hole 4 c that communicates with the inside and outside through the rib 2 d of the cap body 2.

  Also, as shown in FIG. 6, the writing instrument cap 1 of the present invention has a ball rotatably mounted on the tip of an ink containing cylinder 9 in which writing instrument ink (not shown) is directly packed in a shaft cylinder 6. A ballpoint pen refill mounted on the held ballpoint pen tip 11 via the tip holder 10 is arranged, the tip member 7 is screwed to the tip of the shaft tube 6, and the tail plug 8 is mounted on the rear end of the shaft tube. A cap for a writing instrument such as a ballpoint pen, which is detachably mounted by overpass fitting between a fitting projection 6a formed on the outer wall of the shaft cylinder 6 and a fitting protrusion 2c formed on the inner wall of the transparent cap body 2. Use as

  The head crown 4 is mounted on the mounted portion 2 a at the tip of the cap body 2, but the cross-sectional shapes of the mounted portion 2 a of the cap body 2 and the mounted portion 4 a of the crown 4 are different from those of the cap body 2. The long axis K having the longest perpendicular to the axis J and the perpendicular passing through the axis J with respect to the long axis K have a short axis L shorter than the long axis, and is substantially symmetrical with respect to the long axis K. It has a triangular shape.

  Further, in order to increase the fitting force between the cap body 2 and the crown 4, the fitting protrusion 2 b is formed on the outer wall on the long axis K side in the cross-sectional shape of the mounted portion 2 a of the cap body 2 and the mounting portion 4 a of the crown 4. 4b is formed and is fitted over.

  In this way, by making the cross-sectional shapes of the mounted portion 2a of the cap body 2 and the mounting portion 4a of the crown 4 non-circular, the crown 4 is attached to the axis J of the cap body 2 after mounting. It will not rotate.

  Further, the transverse cross-sectional shape of the mounting portion 4a of the head crown 4 has a long axis K having the longest perpendicular to the axis J of the cap body 2 in the vertical cross section, and a perpendicular passing through the axis J with respect to the long axis K. By adopting a shape having a short axis L shorter than the long axis, the outer wall on the short axis K side can be easily grasped by hand and can be easily mounted, and the distance between the outer walls of the mounting portion 4a can be increased, so that it is stable. It is preferable because it can be held.

  Note that the method of attaching the head crown 4 to the cap body 2 can be selected and used as appropriate, such as press-fit mounting and riding-over mounting. However, the fitting protrusion 4b and the opposing cap body on the outer wall of the mounting portion 4a of the head crown 4 can be used. It is preferable that the fitting projection 2b is formed on the mating portion 2 to be fitted over the fitting portion 2 so that it is difficult to come off. However, if the fitting projection 4b is provided on the entire circumference of the mounting portion 4a, the fitting force is high. Since the assemblability is deteriorated by excessively, the fitting protrusion 4b is formed only on the outer wall on the long axis K side of the mounting portion 4a of the crown 4 so that the outer wall on the short axis L side is grasped and the fitting protrusion 4b side is formed. By mounting at an angle, the fitting force can be increased without degrading the assemblability.

  Furthermore, positioning protrusions 4d are formed on the rear end 4e side with respect to the fitting protrusion 4b at two different positions in the circumferential direction of the fitting protrusion 4b.

  By forming the positioning protrusion 4d on the rear end 4e side of the fitting protrusion 4b in different circumferential directions and on the rear end 4e side, it is not necessary to incline from the fitting protrusion 4b side. First, the head crown 4 is placed at a predetermined position by the positioning protrusion 4d, and then the head crown 4 is pressed to easily fit over the fitting protrusion 4b. Even when the crown 4 is mounted so as to be fitted first from the fitting projection 4b side, the positioning projection 4d can prevent problems such as mounting in a bent state.

  In this embodiment, for the sake of convenience, the cross-sectional shape of the attached portion of the cap body and the attached portion of the crown is substantially triangular, but it is not particularly limited as long as it is non-circular, but as described above, the cap body in the longitudinal section A shape having a major axis composed of a perpendicular to the axis of the inner wall of the inner wall, and a perpendicular passing through the axis with respect to the major axis, is preferably a shape having a minor axis shorter than the major axis. As shown in the figure, it is most preferable because it is less slippery when gripped and the design is improved.

  If the cap of the writing instrument of the present invention is a cap of a writing instrument with the cap detachably attached, such as a ballpoint pen or a marker, the type of ink, the shape of the nib, etc., the shape of the writing instrument, the shaft tube, the internal structure, etc. It can implement without being limited to a writing instrument main body.

It is a longitudinal cross-sectional view which shows the cap of the writing instrument of an Example. It is AA sectional drawing in FIG. It is a longitudinal cross-sectional view of the crown in FIG. It is the external view seen from the F direction in FIG. It is a figure which shows the state before mounting | wearing of the crown and the sealing member in FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the axial cylinder with the cap of the writing instrument.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument cap 2 Cap body 2a Mounted part 2b Fitting protrusion 3 Clip 4 Head crown 4a Mounting part 4b Fitting protrusion 4c Air hole 4d Positioning protrusion 4e Rear end 5 Seal member 6 Shaft cylinder 7 Tip member 8 Tail plug 9 Ink receiving cylinder 10 Tip holder 11 Ballpoint pen tip K Long axis L Short axis

Claims (4)

In a writing instrument cap formed by mounting a head and crown mounting portion on a mounting portion formed at a tip portion of the cap body, the cross-sectional shape of the cap body mounting portion and the crown mounting portion is in a vertical section. A long axis having the longest perpendicular to the axis of the inner wall of the cap body, and a perpendicular passing through the axis with respect to the long axis, and a short axis shorter than the long axis, A fitting projection is formed on the outer wall on the long axis side, and a positioning projection is formed at a different location in the circumferential direction of the fitting projection, and the positioning projection is more crowned than the fitting projection. A writing instrument cap formed on the rear end side of the writing instrument . 2. The writing instrument cap according to claim 1, wherein the projecting protrusions are formed at two different positions in the circumferential direction of the fitting projection. 3. 3. The writing instrument cap according to claim 1, wherein a cross-sectional shape of the mounted portion of the cap body and the mounting portion of the crown is substantially triangular . 4. The writing instrument cap according to claim 3, wherein the fitting protrusion and the positioning protrusion are formed on different sides .

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