JP2517465Y2 - Shafts such as writing instruments - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) Fountain pens, small-tube writing instruments, handwriting correction tools, handwriting erasing tools, brushes, eyeliners, lip colors, nail colors, etc. made of synthetic resin injection molded products. Regarding the shaft.

(Prior Art) A shaft is prepared according to various pen tips. For example, for a nib made of a felt core or a bundle of substantially linear fibers, or for a relatively thick pen nib such as a communicating porous foam or sintered body, With a large tip opening is prepared.

(Problems to be Solved by the Invention) A case will be described as an example in which a pen tip made of an extremely common fiber bundle is used as a pen tip of a writing instrument containing a quick-drying ink or the like.

As the pen tip made of the fiber bundle, there are various ones such as a cross-section having a circular shape and a rectangular shape.

Also for the nibs made of the same fiber bundle as described above, the shafts are separately prepared according to the respective shapes.

This is because it is certainly possible to use a shaft prepared for one nib of one shape as a nib of another shape, but the overall shape after assembling becomes awkward. Or, the protrusion of the pen tip may be insufficiently fixed. In particular, when the shaft is made of a synthetic resin injection-molded product, there is a limit to the thinness and strength of the molded product.

In this way, even when trying to unify the appearance as a set product or product group that can obtain various handwriting,
For example, it is very inconvenient that many molds have to be prepared.

(Means for Solving the Problem) The present invention is a shaft body of a writing instrument or the like made of an injection molded product of synthetic resin, in which a cylindrical inner wall portion is connected to a tip opening portion which is a protruding portion of a pen tip. In addition, a writing instrument, etc., in which the tip opening portion and the inner hole of the inner wall portion are used as the pen tip insertion portion, and a plurality of step portions for engaging the pen tip are provided at different positions in the front and rear of the pen tip insertion portion. The main point is the shaft.

(Example) An example is shown in the accompanying drawings.

In FIG. 1, reference numeral A1 is a pen tip drawn in consideration of the general shape of the fiber bundle made of the fiber bundle based on the above. The rear portion 2 has a smaller diameter portion than the front portion 1, but has a circular cross-sectional shape.

Further, reference numeral B is a shaft, which is made of an injection-molded product of synthetic resin, has a tip opening portion 3 which is a protruding portion of the pen tip A1, and a cylindrical inner wall portion 4 which is connected to the tip opening portion 3. Have. The pen tip A1 is inserted through an inner hole having a circular cross-section formed by the tip opening 3 and the inner wall portion 4, and a rear end of the front portion 1 is formed on a step portion 5 provided near the rear end of the inner wall portion 4. It is positioned by engaging. Desirably, the inner diameter of the inner wall portion 4 is made smaller toward the rear side in front of the step portion 5, and at least in the inner hole portion 6 near the step portion 5, a pressure input acts on the pen tip A1. It is good to do so. It is also preferable that the small-diameter inner hole portion 7 behind the step portion 5 receives a force input. Reference numeral 8 is a through hole as an air hole (four in the figure are formed), and reference numeral 9 is a rib for positioning an ink occlusion body (not shown).

By the way, as also shown in FIG. 2, this shaft body B has a further step portion (hereinafter referred to as “front step portion”) in front of the step portion 5.
Say 10). In the state shown in FIG. 1, the front step portion 10 secures the outlet portion of the through hole 8 as an air hole, but depending on the type of the pen tip, it is also for engagement.

 One example is shown in FIG.

Nib A2, which is also drawn with the fiber bundles in mind
Has a rectangular cross-sectional shape with a thickness (vertical length in the drawing) different from that of the front portion 11, the central portion 12, and the rear portion 13, and the rear end of the front portion 11 is a front step portion. 10 (see FIG. 4), and the rear end of the central portion 12 is engaged with the step portion 5.

If the shaft body B is not provided with the front step portion 10 and is opened as it is as the inner hole of the inner wall portion 4, the pen tip that can be used is the circle of the cross section of the pen tip A1 as the circumscribed circle. And the cross section becomes small. As a result, it looks very clunky as a whole. However, the pen tip A2 having a large diameter corresponding to the front step portion 10 can be used.

Further, as can be seen from FIG. 4, the engagement area of the front portion 11 of the front step portion 10 is not large. It is only secured in the square part. The engagement area of the central portion 12 of the step 5 is likewise not large. Of course, the force input as described with reference to FIG. 1 can be applied to this square portion. However, the pen tip fixing force by each engagement is the first
Not as big as shown. If only one of the engagements is secured, it becomes difficult to securely fix the pen tip A2. However, by ensuring the engagement at the two positions (or a plurality of parts more than that), the pen tip A2 can be sufficiently fixed.

As described above, an example has been described, but various modifications can be made without departing from the gist. For example, there is a portion indicated by a dotted line in FIG. 1 (in the vicinity of the tip of the inner wall portion 4). The longer the distance between the front step portion 10 and the step portion 5 is, the more the lateral deflection of the pen tip A1 can be suppressed, and the pressure input can be exerted accordingly. However, if it is not necessary to take such precautions, as shown by this dotted line, the inner wall portion is made to project rearward from the rear end portion of the front end opening portion 3 and a portion corresponding to the front step portion 10 is provided. , Can be located further back. If there is no problem in strength, for example, the through hole 8 may be an inner wall portion extending to the rear end. In addition, there is also a portion shown by a dotted line in FIG.
Above). The through holes 8 are provided as air holes. However, the place where the air hole is formed may be appropriate. For example,
It can also be formed as shown by the dotted line. Further, the shape and type of the pen tip is appropriate, and it can be used as a shaft of a writing instrument of another type that does not use an ink occlusion body.
Further, it may be one component of a shaft body composed of multiple components such as a front shaft and a rear shaft.

(Effect of the Invention) The shaft body of the present invention is a shaft body of a writing instrument or the like made of an injection molded product of synthetic resin, in which a cylindrical inner wall portion is connected to a tip opening portion which is a protruding portion of a pen tip. , The tip opening portion and the inner hole of the inner wall portion are used as the pen tip insertion portion, and a plurality of step portions for engaging the pen tip are provided at different positions in the front and rear of the pen tip insertion portion. Even when using multiple different nibs, the overall shape after assembly can be made good, and each nib can be fixed well, for example, the appearance as a set product or product group that can obtain various handwriting It is very convenient when you want to unify.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a lateral sectional view taken along the line II-II of FIG. 1, and FIG. 3 is an essential part showing application to a pen tip having a different shape. Longitudinal section, Fig. 4 is IV of Fig. 3
-IV cross-sectional view. A1, A2 ... Nib, 1 ... Front part, 2 ... Rear part, 3 ... Tip opening part, 4 ... Inner wall part, 5 ... Step part, 6 ... Inner hole part,
7: small diameter inner hole, 8: through hole, 9: rib, 10: front step, 11: front part, 12: central part, 13: rear part.

Claims (1)

(57) [Scope of utility model registration request] 1. A shaft body for a writing instrument or the like made of a synthetic resin injection-molded article, wherein a cylindrical inner wall portion is connected to a tip opening portion which is a protruding portion of a pen tip, and the tip opening portion and the inner portion are formed. A shaft body such as a writing instrument in which an inner hole of a meat portion is used as a pen tip insertion portion, and a plurality of step portions for engaging the pen tip are provided at different positions in the front and rear of the pen tip insertion portion.