JP2000343871A - Grip for writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a reaction to be received by a writing tip of a writing instrument as small as possible and to alleviate a labor hour of a writing work by forming a material of a grip of the instrument of a shape memory polymer, providing a gap in a cylindrical state to a barrel of the instrument, and heating this portion to a deforming temperature or above to form a recess at the grip. SOLUTION: The grip 2 is engaged in a sheath-like state with a writing instrument body 1. A material of the grip 2 is a shape memory polymer, and its deforming temperature is set to about 40 to 60 deg.C. After the body 1 is associated with the grip 2, the grip 2 is set to the deforming temperature or above of the polymer, and gripped by a way of gripping of normally writing. As a result of the gripping, a portion brought into contact with fingers is pressed down in a direction of a gap 3, and recesses 4, 41, 42 pressed by a thumbs, an index finger and an intermediate finger gripped at the outside of the grip 2 are formed. When the temperature is lowered to an ordinary temperature, it is solidified in the deformed state according to the properties of the polymer, and hence the instrument adapted to the grip of the using hand can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a grip for a writing instrument.

[0002]

2. Description of the Related Art Conventionally, with commercially available writing instruments, the writing instrument is made easy to grip and the finger is hard to slide, so that irregularities are formed at a small interval in the grip section, the material of the grip section is made of rubber, the tip of the grip section is made. The side is slightly thicker.
However, writing still requires a great deal of force on the fingertips, which often results in tired fingers, wrists, shoulders, and the like.

[0003]

SUMMARY OF THE INVENTION According to the present invention, it is possible to reduce the labor of the writing operation by minimizing the force required to receive the reaction force of the writing tip in accordance with the manner of gripping the writing implement by an individual. Aim.

[0004]

In order to achieve the above object, the present invention uses a shape memory polymer as the material of the grip portion of the writing implement, has a cylindrical shape, and provides a gap between the writing implement and the shaft. This part is heated to the deformation temperature of the shape memory polymer or more, and when it becomes soft, the writing instrument is gripped, and the part of the grip part where the finger touches is pushed inward to make a sponge. When the temperature is returned to room temperature in this state, the shape memory polymer is solidified, and the sponge that fits the grip of the finger is fixed. According to the present invention, since a spike matching the position of the finger holding the writing instrument of each individual can be formed, the reaction force of the force applied to the writing tip of the writing instrument is received over a wide area of the finger that comes into contact with the spike of the gripping portion, so that the fingertip is unnecessary. It can be done without putting great effort.

[0005] The present invention is characterized in that the initial shape of the grip portion is a conical shape with a thick tip side or a trumpet shape spreading toward the tip side. According to the present invention, it is possible to more easily receive the reaction force of the force applied to the writing tip of the writing implement.

[0006] The present invention is characterized in that a groove or a large number of irregularities are provided on the outer periphery of the grip portion. According to the present invention, when the grip portion is heated and deformed to a temperature equal to or higher than the deformation temperature, the temperature of the protruding narrow area portion is quickly decreased, so that the solidification of this portion is fast, and the finger is gripped to form a bubble. This groove or unevenness remains, and has a function of preventing slippage.

According to the present invention, since the shape memory polymer is used as the material of the grip portion, the grip portion is deformed when the contact of the finger with the writing implement does not become smooth or the user changes after using the writing instrument. When heated as described above, the shape of the grip portion returns to the initial state, so that the grip portion can be formed into a grip portion suitable for the user any number of times.

[0008]

FIG. 1 shows an example in which the present invention is implemented.
In FIG. 1, a grip portion 2 is fitted in a writing instrument body 1 in a sheath shape. The material of the grip portion 2 is a shape memory polymer, and the deformation temperature is set to about 40 to 60 ° C. The appearance is a frustoconical shape with a thick pen tip side, and there is a gap 3 between the writing instrument main body 1 and the inside. When fitting the grip portion 2 into the writing instrument body 1,
As shown in FIG. 1, even if the axis of the writing implement body 1 is partially thicker than the size of the hole of the grip part 2, the shape memory polymer has the property of rubber at a temperature higher than the deformation temperature. Since it is stretched, the grip portion 2 can be fitted into the writing implement body 1 at such a temperature.

FIG. 2 shows a state in which, after assembling the writing instrument main body 1 and the grip portion 2 in the manner shown in FIG. 1, the grip portion 2 is held at a temperature not lower than the deformation temperature of the shape memory polymer, and is gripped by a normal writing grip. In this case, in order to specify the position of the writing instrument to be gripped in the circumferential direction, a mark 5 is attached to an easily visible place.

FIG. 3 shows a state of deformation of the grip portion 2 after gripping in FIG. As a result of the gripping as shown in FIG. 2, the portion touched by the finger is pushed down toward the gap 3, and the thumb 4, 41, and 41, which are pressed by the thumb, the index finger, and the middle finger held outside the grip portion 2.
42. When the temperature is lowered to room temperature, due to the properties of the shape memory polymer, the material is solidified in this deformed state, and a writing instrument suitable for the grip of the user is completed.

[0011]

According to the present invention, in accordance with the manner in which the user holds the writing implement, the user can use the force as small as possible to receive the reaction force of the tip of the writing implement, so that the writing operation can be performed easily.

[Brief description of the drawings]

FIG. 1 shows an assembly drawing in which a grip portion made of a shape memory polymer is fitted into a writing instrument main body.

FIG. 2 is a view showing that the writing instrument of FIG. 1 is heated to a temperature not lower than the deformation temperature of the shape memory polymer and is gripped in that state, thereby forming a bomb on a grip portion.

FIG. 3 is a view showing a state of a sponge formed as shown in FIG. 2;

[Explanation of Signs] 1 Writing instrument main body 2 Grip portion 3 Gap 4 Kubomi formed by fingers 41 Kubomi formed by fingers 42 Kubomi formed by fingers 5 Marks

Claims (3)

[Claims] The material of the grip portion of the writing instrument is set to a deformation temperature of 40.
A shape memory polymer having a temperature of up to 70 ° C., which is formed into a cylindrical shape, is fitted into a corresponding portion of a writing instrument. A gap is provided between the grip portion and the outer diameter of the writing instrument shaft. The grip is heated above the deformation temperature of the shape memory polymer, and when the grip becomes soft, the writing instrument is gripped and the part of the grip touched by the finger is pushed inward to create a spike. In this state, when the temperature is returned to room temperature, the shape memory polymer is solidified, and a sponge that matches the way of gripping the finger is fixed. 2. A shape of a grip portion of a writing instrument, wherein the grip portion has an initial shape of a conical shape with a thick tip side or a trumpet shape spreading toward the tip side. 3. The shape of the grip portion of the writing instrument, wherein the grip portion has a groove or a large number of irregularities on the outer periphery.