JP7565779B2 - Writing implement and gripping member for writing implement - Google Patents

Description

The present invention relates to writing instruments such as ballpoint pens and mechanical pencils, and to gripping members that form the part that holds the writing instrument.

Some writing implements have a grip made of elastic resin around the outer periphery of the barrel to prevent slipping and make it easier to hold. If a low-hardness elastic resin is used to improve grip, the surface tends to be sticky and have a poor feel. For this reason, for example, a pen with a cloth-like member around the outer periphery of the elastic resin is known (see, for example, Patent Document 1).

JP 2007-90823 A

However, even if a cloth-like member is arranged around the outer periphery of the elastic resin as described above, the elastic resin itself must have a hardness that allows it to maintain its shape, making it difficult to achieve a significantly softer grip.

In view of the above, the present invention aims to make it easier to obtain a significantly softer gripping feel when using a gripping member in a writing instrument.

In order to achieve the above objectives,
The present invention relates to
A writing instrument having a writing instrument body and a gripping member formed of an elastic resin and provided on an outer periphery of the writing instrument body,
The gripping member has a solid portion in which the elastic resin is solidly formed at an end portion on the writing tip side, and a three-dimensional lattice structure portion formed on the head side on the opposite side to the writing tip side from the solid portion,
The gripping member is characterized in that the solid portion is configured to abut against a movement restricting portion of the writing implement main body or a member fixed thereto, thereby restricting movement toward the writing tip portion.

This makes it easy to properly receive the force applied by the fingers gripping the gripping member when writing, pressing the writing implement toward the writing tip, for example, by the movement restricting portion, making it easy to significantly soften the portion of the gripping member that is gripped by the fingers.

The present invention makes it easy to achieve a significantly softer gripping feel for the gripping member of a writing instrument.

FIG. 2 is an external view showing the configuration of the writing instrument. FIG. 2 is a partial cross-sectional view showing the configuration of the writing instrument. FIG. 13 is an external view showing the configuration of a writing implement according to a modified example.

The following describes in detail an embodiment of the present invention with reference to the drawings.

(General configuration of writing instrument 100)
As shown in Fig. 1 and Fig. 2, the writing instrument 100 has a cylindrical gripping member 103 made of an elastic resin, which will be described later in detail, fitted from the writing tip side to the outer periphery of the writing tip side (left side in Fig. 1 and Fig. 2) of the writing instrument body 101. A ferrule 102 that screws into the male screw part 101b of the writing instrument body 101 is provided on the writing tip side of the gripping member 103, and the movement of the gripping member 103 toward the writing tip side is restricted by the end face (movement restricting part) of the ferrule 102 on the writing instrument body 101 side abutting against the gripping member 103. In addition, the gripping member 103 is also restricted from moving in the direction opposite to the writing tip side by the abutment of the body part step part 101a of the writing instrument body 101 at the other end. A writing body 104, of which only the tip portion protruding from the ferrule 102 is shown, is housed inside the writing instrument main body 101, and although not limited thereto, it is adapted to appear and disappear from the ferrule 102 by operating a knock body 105 provided on the head side opposite the writing tip portion.

Here, the specific shapes and configurations of the writing instrument body 101, ferrule 102, etc. are not particularly limited, and various steps or tapers may be formed in the portion of the writing instrument body 101 where the gripping member 103 is inserted, a male thread may be formed on the ferrule 102 so as to be screwed into a female thread formed at the tip of the writing instrument body 101, or the writing instrument body 101, etc. may be constructed by combining multiple components.

(Configuration of gripping member 103)
The gripping member 103 has a solid portion 103a formed of a solid elastic resin at the end on the writing tip side, and a three-dimensional lattice structure portion (lattice structure) including a hard portion 103b and a soft portion 103c is formed on the head side opposite the writing tip side from the solid portion 103a. More specifically, the three-dimensional lattice structure portion has a structure in which, for example, a lattice (same shape as a body-centered cubic lattice) in which octahedrons are repeatedly arranged with elastic resin wires as components, a simple square lattice, or a structure in which other wires different from the repeating elements are added as components to these. The three-dimensional lattice structure as described above can be relatively easily manufactured by a 3D printer using, for example, nylon, polyphenylene sulfide, polyether ether ketone, ABS (Acrylonitrile butadiene styrene), polylactic acid, polyurethane, etc., together with the solid portion 103a.

The hard portion 103b and the soft portion 103c are formed to have different hardness, for example, by varying the pitch of the lattice of the three-dimensional lattice structure, the wire diameter of the wire, and/or the material of the material. In particular, changing the wire diameter of the wire is particularly advantageous in that the position of the lattice joints does not change compared to changing the pitch, making structural design easier, it is easy to change the elasticity (gradually) in a small range, and it is easy to reduce the change in appearance and make it less likely to cause discomfort. The change in hardness is not limited to two stages, but may be three or more stages, or may be substantially continuous.

As described above, by forming a three-dimensional lattice structure as the gripping member 103 and forming a solid portion 103a at the end on the writing tip side, even if the force of the fingers gripping the gripping member 103 pressing the writing instrument 100 toward the writing tip side acts on the gripping member 103 during writing, the force can be easily received appropriately by the ferrule 102, so that the part of the gripping member 103 that is gripped by the fingers can be easily significantly softened. Furthermore, by providing the three-dimensional lattice structure with a hard portion 103b between the soft portion 103c and the solid portion 103a near the part gripped by the fingers, the deformation of each lattice unit can be gradually made different, so that the unnatural deformation of the gripping member 103 caused by the force of the fingers can be easily suppressed to a small value.

(Modification)
When the gripping member 103 is configured to be sandwiched between the ferrule 102 and the body step 101a of the writing instrument body 101 as described above, a solid portion or a hard portion may be formed in the portion where the gripping member 103 abuts against the body step 101a. This allows the gripping member 103 to be fixed more reliably.

In addition, the head side end face of the ferrule 102 is not limited to abutting against the gripping member 103 and acting as a movement restricting part, but other parts, such as a flange-shaped part, may be formed on the writing tip side of the writing instrument main body 101, and may abut against the gripping member 103 inserted from the head side.

The gripping member 103 is not limited to having the three-dimensional lattice structure formed only near the portion gripped by the fingers, but may be formed up to the vicinity of the head side of the writing instrument 100, as shown in FIG. 3, for example. Even in such a case, a solid portion or a hard portion may be formed in the portion where the gripping member 103 abuts against the body step 101a. In particular, when an eraser or friction body is provided on the head side of the writing instrument 100, the body step 101a can easily appropriately bear the pressing force when the writing instrument 100 is gripped upside down and the head side is pressed against paper or the like.

REFERENCE SIGNS LIST 100 Writing implement 101 Writing implement body 101a Body step 101b Male thread 102 Base 103 Grip member 103a Solid portion 103b Hard portion 103c Soft portion 104 Writing body 105 Knocking body

Claims (4)

A writing instrument having a writing instrument body and a gripping member formed of an elastic resin and provided on an outer periphery of the writing instrument body,
The gripping member has a solid portion at an end portion on the writing tip side, in which the elastic resin is solidly formed, and a three-dimensional lattice structure portion having wires of elastic resin as components, formed on the head side on the opposite side to the writing tip side from the solid portion;
The gripping member is configured such that the solid portion abuts against a movement restricting portion in the writing instrument main body or a member fixed thereto, restricting movement toward the writing tip portion. 2. The writing instrument of claim 1,
The three-dimensional lattice structure has a hard portion formed relatively hard on the writing tip side and a soft portion formed relatively soft on the head side ,
The hard portion and the soft portion are different from each other in at least one of the lattice pitch of the three-dimensional lattice structure, the wire diameter of the wire, and the material of the material . A writing instrument according to any one of claims 1 to 2,
The gripping member further has a head-side solid portion at an end portion on the head side, the elastic resin being solidly formed therein,
The gripping member is characterized in that the head side solid portion is configured to abut against a head side movement restricting portion of the writing instrument main body or a member fixed thereto, thereby restricting movement toward the head side. A grip member for a writing instrument according to any one of claims 1 to 3,
A gripping member for a writing implement, comprising: a solid portion at one end portion where the elastic resin is solidly formed; and a three-dimensional lattice structure portion formed on the other end portion.

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