JPH10100582A - Propelling pencil for infant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propelling pencil for infant which makes a user be able to acquire a method for holding a writing implement correctly, to write while rotating the pencil, and to write characters of the same thickness. SOLUTION: A pencil as a whole is made small and light, the cross section of a grip 12 is made triangular, a circular fringe 13 is formed on the boundary between a tapered front opening part 11 and a grip part, a circular projection 14 is formed behind the fringe 13, the axial positions of the forefinger, the middle finger, and a thumb are regulated by the fringe 13 and the projection 14, and a user can acquire a method for holding the pencil correctly. Since the cross section of the grip 12 is hexagonal, and the fringe 13 and the projection 14 do not regulate the circumferential positions of fingertips, the user can write while rotating the pencil by 120 deg. at a time and write characters of the same thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil that enables infants and school children to learn how to hold a writing instrument correctly.

[0002]

2. Description of the Related Art Writing instruments such as pencils and mechanical pencils are held with the thumb, forefinger and middle finger, and the rear part is supported by the forefinger and thumb, but the correct way to hold the thumb is to the first joint of the forefinger. . The ring finger and little finger should be gently put on the palm of the hand, but when writing, put the little finger on the desk and hold the writing implement at a 60 ° angle to the paper. Thumb, index finger, wrist and shoulder Write without power. For writing instruments that use a lead core, such as pencils and mechanical pencils, write a little, and then write with the thumb rotated while supporting the writing instrument with the index and middle fingers. By writing while turning the writing instrument, the tip of the lead core naturally becomes a pyramid, and it is possible to always write in a character having a constant thickness. If you write without turning it, the tip of the lead will be slanted,
Characters of the same thickness cannot be written. In the case of a pencil, the number of times of shaving increases.

[0003]

It is necessary to learn how to properly hold such writing implements during childhood, but recently, very few infants and school children can write with proper writing implements such as pencils for the following reasons. is the current situation.

[0004] In schools, writing instruments used by infants and school children use pencils in first and second graders in elementary schools because they use pencils under the instruction of the subject specified by the Ministry of Education, but use pencils in third graders. More school children to start. However, pencils and mechanical pencils used by infants and school children are
It is the same as that used by adults, and has the disadvantage of being too long and heavy for infants and lower school children. As described above, the writing implement is held by the thumb, the index finger and the middle finger, and the rear part is supported by the forefinger and the foremost part of the thumb. However, the length of the new pencil is 170 mm or more, and its center of gravity is located behind the forefinger and thumb of the hand of the infant or school child. The weight of the pencil is about 6g, and it is not heavier than other writing instruments such as mechanical pencils.However, because the center of gravity of the pencil is located behind the forefinger and thumb, it feels heavy, You have to write with your fingertips.

[0005] Infants and schoolchildren of lower grades have weaker fingertips, especially the first joint. For this reason, even if an effort is made to hold the writing instrument correctly, the writing instrument is the same as that used by adults and is heavy, and as described above, because the writing instrument is long and the center of gravity of the writing instrument is at the rear, it takes 2 to 3 minutes. When writing, the joint of the thumb is bent into a U-shape, and the index finger and the middle finger are held down, and the tip of the writing implement has a tapered portion.
In other words, even if you teach the correct way of holding, you will not be able to hold the correct way in a short time, but in such a state, the lead core at the tip is not visible at all, and the index finger and the middle finger are pressed with the thumb, so naturally The wrists and shoulders are too hard and fall forward. Therefore, the distance between the sheet and the eyes is about 5 to 10 cm, which is one of the causes of the myopia.

As described above, when an infant or school child uses the same writing implement as that used by an adult, it is difficult to learn how to hold the writing implement correctly. Therefore, in order to fix the position of the thumb, index finger, etc., a writing instrument for training with a recess for fixing the fingertip on the barrel, or an auxiliary tool with a recess inserted into the barrel is proposed. However, since these cannot be written while turning the writing instrument, there is a problem that characters having the same thickness cannot be written.

Therefore, according to the present invention, a thumb or an index finger can be held in a correct position, so that the user can learn how to hold a writing instrument correctly. It is an object of the present invention to provide a writable mechanical pencil for infants.

[0008]

In order to achieve the above object, a mechanical pencil for an infant according to the present invention has a grip having a triangular cross-sectional shape and a circumferential edge provided at a boundary between a tapered front opening and the grip. At the same time, behind the circumference,
A circumferential projection or step which can be sensed by touch is provided, and the circumferential edge and the circumferential projection or step regulate the axial position of the index finger, the middle finger, and the thumb, so that a correct holding style is achieved. Further, since the cross-sectional shape of the grip is triangular, and the circumferential edge and the circumferential protrusion or the step portion do not regulate the circumferential position of the index finger, the middle finger and the thumb, it is possible to write while turning by 120 °, You can write characters of the same thickness.

In the case of infants and lower grades, the distance between the tip of the writing instrument and the forefinger of the thumb is about 70 mm,
When the total length of the mechanical pencil is 140 mm or less, the center of gravity can be positioned in front of the forefinger and thumb. Therefore, it is stable when gripped, so that it is possible to write without applying excessive force to the fingertip. Further, the weight is desirably 10 g or less.

[0010] It is considered that the burden on the shaft of the writing implement is the least when it is about 13 mm for an adult. However, for infants with small hands, such a writing instrument with a shaft diameter is too thick,
The diameter of the virtual circumscribed circle of the triangular grip part is 8 to 11 mm
It is preferred to be φ.

Next, when the length from the tip of the front end to the circumference is 18 to 22 mm, and the length from the circumference to the circumferential projection or step is 9 to 11 mm, the infant or the lower grade school child The size and weight of the mechanical pencil are suitable, and it is easy to maintain the correct holding style of the writing implement even when writing for a long time, and an excellent effect can be obtained.

Further, when a thick and soft lead core having a thickness of 2.0 to 3.0 mmφ and a hardness of 2B to 6B is incorporated, the core is less likely to break even if it is fully written or dropped on the floor or the like. Thus, a mechanical pencil suitable for infants and school children can be obtained.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a knock mechanical pencil. A connector 3 is attached to a barrel 1, and a chuck 4, a chuck ring 5, a knock spring 7 and a lead case, which are mechanical pencils, are attached to the connector 3. 6 is assembled.
That is, the chuck 4 in which the chuck ring 5 is inserted into the tapered outer peripheral surface is inserted from the front of the connector 3, and the tail end of the chuck 4 is pressed into the core case 6 inserted from behind the connector 3. A knock spring 7 interposed between the connector 3 and the core case 6 resiliently projects the core case 6 and the chuck 4 toward the tail end. Accordingly, the chuck 4 is fastened by the chuck ring 5 and bites the lead core 9 inserted in the center hole.

A knock cover 2 is fitted to the tail end of the core case 6 and protrudes from the tail end opening of the barrel 1. And
When the knocking operation is performed by pressing the knock cover 2 with a fingertip, the chuck 4 moves forward and the lead core 9 is extended from the front end opening of the front opening portion 11, and when the knocking operation is released, the retracted chuck 4 bites the lead core 9 again. You can write on it. The knock cover 2 is provided with a vent hole 21 so that even if an infant accidentally swallows the knock cover 2 removed from the core case 6 and gets stuck in the throat, it is possible to breathe through the vent hole 21. It has become.

A tip end of the barrel 1 is a tapered front end portion 11, and a breaker 8 for lightly holding the lead core 9 released from the chuck 4 at the time of knocking is disposed in the front end portion 11. In the present embodiment, the shaft tube 1 and the front end portion 11 are integrated, but the front end portion 11 may be formed as a separate component and screwed to the front end opening of the shaft tube 1. The lead core 9 has a thickness of 2.0 to 3.0 m.
mφ, hardness is 2B to 6B, and it is thick and soft. When such a lead core 9 is used, the pencil can be written with a thick handwriting, and even if it is written as hard as possible, or if the mechanical pencil is dropped on the floor or the like, the core breakage is reduced, and the mechanical pencil suitable for infants and school children can be obtained.

Next, as shown in FIG. 2, a grip portion 12 is formed on the surface of the barrel 1 adjacent to the front end portion 11.
As shown in FIG. 3, the grip 12 has a triangular cross section with rounded corners. here,
The diameter of the virtual circumscribed circle of the triangular grip is 8 to 11 mm
The diameter of the finger is small, so that even infants with small hands and small school-age children can easily grasp and reduce the burden.

A circumferential edge 13 which is an annular projection is formed at a boundary between the front end portion 11 and the grip portion 12. In the middle part of the grip 12, a relatively small circumferential projection 14 is provided on the tail end side of the circumferential edge 13 so as to be sensed by touch. Instead of the circumferential projection 14, a small step which can be recognized by touch may be used.

Here, the length L ₁ from the leading end 11 to the circumferential edge 13 is in the range of 18 to 22 mm, for example, 20 mm, and the length L ₂ from the circumferential edge 13 to the circumferential protrusion 14 is 9 to 11 m.
m, for example, 10 mm. With such dimensions, as will be described later, the positions of the thumb, index finger, and middle finger of small children and school children can be correctly regulated. The total length of a normal mechanical pencil is 15
Although it is about 0 mm, the total length L of the mechanical pencil of the present invention is 140 mm or less, for example, 130 mm, and the weight is 10 g or less, for example, 8 g, which is lighter than a normal mechanical pencil.
It is a light one. Therefore, even if an infant with small hands and weak fingertips or a schoolchild of lower grades grasps it, the center of gravity is positioned in front of the thumb with the index finger and is stable, and even if writing for a relatively long time is tired. do not do.

Thus, when writing with the mechanical pencil of the present invention, as shown in FIG. 4, the index finger and the middle finger are applied between the circumferential edge 13 and the circumferential projection 14, and the thumb is placed on the circumferential projection 14.
And grip it. As a result, the thumb can be shifted to the position of the first joint of the index finger and can be correctly held. The circumferential position of the thumb, forefinger and middle finger in the axial direction is regulated by the circumferential edges 13 and 14 which are annular projections, so that the mechanical pencil is small and lightweight, and fits the hand of infants and school children. In addition to this, even when writing is performed for a relatively long time, the positions of the fingertips do not shift, and the correct holding style can be maintained. Therefore, when the infant or school child uses the mechanical pencil of the present invention, it is possible to naturally learn the correct way of holding the writing implement in childhood.

Next, the circumferential edge 13 and the circumferential projection 14 do not restrict the positions of the thumb, index finger and middle finger in the circumferential direction, and the grip 13 has a triangular cross section. Can be rotated 120 ° at a time. Therefore, the tip of the lead core 9 naturally becomes a hexagonal pyramid, and can always be written in a character having a constant thickness.

[0021]

As described above, the mechanical pencil for infants of the present invention is provided with a circumferential edge and a circumferential projection for regulating the thumb, the index finger and the middle finger at the correct positions on the grip portion having a triangular cross section. , Small and light enough to fit the hands of infants and school children, so that children can learn how to hold the writing implement correctly in their childhood, and can write while turning, and write in the same size characters Can be used as a mechanical pencil.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view of a grip portion.

FIG. 4 is an explanatory diagram of a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 11 Front end part 12 Grip part 13 Circumference edge 14 Circular projection 2 Knock cover 3 Connector 4 Chuck 5 Chuck ring 6 Core case 7 Knock spring 8 Breaker 9 Lead core

Claims (4)

[Claims] 1. A grip section having a triangular cross section, a circumferential edge provided at a boundary between a tapered front end and the grip section, and a circumferential projection or step which can be recognized by tactile sense is provided behind the circumferential edge. A mechanical pencil for infants, characterized in that it is provided. 2. The length from the tip of the front opening to the circumferential edge is 18 to 22 mm, and the length from the circumferential edge to the circumferential projection or step is 9 to 11 mm. The mechanical pencil according to claim 1. 3. The triangular grip portion has a total length of 140 mm or less, a weight of 10 g or less, and a virtual circumscribed circle of the triangular grip portion having a diameter of 8 to 1 mm.
3. The mechanical pencil for infants according to claim 1, wherein the mechanical pencil has a diameter of 1 mm. 4. A lead core having a thickness of 2.0 to 3.0 mmφ and a hardness of 2B to 6B.
Or the mechanical pencil for infants according to 3.