JP2009269262A - Pencil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pencil which can surely stop in a constant stationary condition even when it rolls on a surface such as a desk by rotational stress even though the axis thereof includes a round cross section and is shaped to easily continue to roll and which also can be easily produced by conventional manufacturing equipment. <P>SOLUTION: Two different kinds of materials with different specific gravities are used for an axis body 11 comprised separately from a solid core 20, the combination of the lower specific gravity material A12 and the higher specific gravity material B13 covering the solid core 20 so that the center of the gravity of the pencil 10 may not correspond to the area center 21 of the cross section of the axis body 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a pencil provided with a rolling stop structure by making the center of gravity of a shaft body a low center of gravity and moving like a rising spill.

Since ancient times, a pencil has a simple shape such as a circular or hexagonal axial cross section, and can be easily rolled when a little rotational stress is applied. Therefore, as an adverse effect of rolling, there is a case where even on a desk lightly, it does not immediately stand still but continues to roll on the desk. In addition, if the user rolls too much, the user may fall from the desk and pick up from the ground. Therefore, for example, in order to prevent rolling, the cross-sectional shape is processed into an atypical shape so that the position of the center of gravity is lowered, and it can easily reach a stationary state at a fixed position (Patent Document 1), or a protrusion on the surface. A technique is disclosed in which an object is formed and rolling friction is improved to prevent rolling (Patent Document 2).
JP2007-98588 2-88794

Although it is possible to provide a rolling prevention function by providing protrusions on the atypical cross section and the shaft surface as in the above prior art, a pencil having an atypical cross section as in Patent Document 1 is a conventional pencil manufacture. Pencils with protrusions on the surface as in Patent Document 2 are not suitable for mass production using equipment, and parts are added, which increases costs and increases the weight of the shaft. Easy to influence.
In view of the above points, an object of the present invention is to provide a rolling countermeasure structure capable of using a conventional pencil manufacturing facility and avoiding an increase in cost.

In view of the above problems, the present inventor has intensively studied, and as a result, the position of the center of gravity in the axial cross section of the pencil having a cross section in which the shaft body has substantially the same shape with respect to the axial direction and a substantially point symmetrical shape from the center of the cross section. The pencil is characterized in that it does not coincide with the cross-sectional center position. The cross-sectional center position indicates the center of gravity of the area when the cross section is viewed in plan.

The axial cross-sectional shape of the pencil is not particularly limited as long as it has a shape that is point-symmetric with respect to the center of the cross section, such as a regular hexagon, as well as a general round shape, and can easily roll when rotational stress is applied. There is no.

The two-part shaft members formed around the solid core have different specific gravities. The difference in specific gravity is preferably 0.7 or more in order to fully exhibit the effects of the invention, but the specific gravity difference of the shaft member is not particularly limited as long as the position of the center of gravity is not at the center of the cross section. As the material of the shaft member, inexpensive wood such as coniferous wood, hardwood wood, or southern ocean wood is mainly used.

Since the present invention is configured as described above, it is not much different from the conventional production method, and it is easy to take measures against rolling, and the center of gravity is not located at the center of the cross section. It has a spill-like movement and prevents rolling. Moreover, since there are no attachments, such as a clip, and there are no foreign objects, such as a protrusion, on the surface, it is excellent in the storing property in a pencil case. Furthermore, if an advertisement is printed on a surface with a low specific gravity, the advertising effect is enhanced because the advertisement surface is always positioned on the upper surface in a stationary state.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an entire pencil 10 having a circular cross section according to an embodiment of the present invention. The solid core 20 has a structure in which the periphery of the solid core 20 is covered only with the shaft member A12 or the two components of the shaft member A12 and the shaft member B13. Conventionally, the axial diameter of the pencil 10 in the present invention is 7.6 mm, the solid core 20 is a commercially available pencil core (hardness HB), and the core diameter is 2 mm.

(1) First Embodiment FIG. 2 shows a cross-sectional view of a pencil according to the first embodiment of the present invention. The volume ratio between the shaft member A12 and the shaft member B13 is substantially the same, but the weight is different, and the shaft member B13 is heavier because the specific gravity is higher than that of the shaft member A12. In this embodiment, the material of the shaft member A12 is balsa (air-dry specific gravity 0.20), paulownia (air-dry specific gravity 0.30) and cedar (air-dry specific gravity 0.38), and the material of the shaft member B13. Used ebony (air-drying specific gravity 1.09) and cedar compressed wood (air-drying specific gravity 1.54).

The method for manufacturing the pencil 10 according to the present invention is similar to the conventional method for manufacturing a pencil, in the method for manufacturing a pencil in which the cross-sectional shape of the shaft body 11 having the solid core 20 at the center thereof is, for example, circular. A step of forming a groove for mounting the solid core 20 on the shaft plate of the shaft member A12 and the shaft member B13 forming the shaft body 11, and mounting the solid core 20 in the groove to form the groove The shaft member A12 and the shaft member B13 that are formed together are bonded to each other with an adhesive, and the shaft member A12 and the shaft member B13 that are bonded together by a rotary cutter for forming the shaft body 11 are cut to form the shaft body 11. And a step of applying a paint to the outer peripheral surface of the shaft body 11. Moreover, when forming the said ditch | groove, it protrudes from the inner surface (a bottom face is included) of a ditch | groove by forming by grinding in the perpendicular | vertical tangent direction with the fiber of the timber which comprises the said shaft member A12 and the shaft member B13. Generation of fiber flash can be reliably suppressed.

(2) Second Embodiment FIG. 3 shows a cross-sectional view of a pencil according to a second embodiment of the present invention. As a second embodiment, the shaft member B13 is used only for ¼ instead of half the volume excluding the solid core 20 as shown in FIG. If the position of the center of gravity is located on the shaft member B13 side, the volume ratio between the shaft members is not particularly specified. Other configurations are the same as those in the first embodiment.

(3) Third Embodiment FIG. 4 shows a cross-sectional view of a pencil according to a third embodiment of the present invention. As the third embodiment, the shaft member A12 is employed only in 1/4 as opposed to the second embodiment. If the position of the center of gravity is located on the shaft member B13 side, the volume ratio between the shaft members is not particularly specified. About another structure, it is the same as that of 1st Embodiment.

Since the center of gravity of the first to third embodiments is on the side of the shaft member B13, the shaft member A12 side is always on the side of the shaft member A12 when the pencil 10 is stopped after rolling by applying rotational stress and then rolling up. The configuration is located above.

(4) Conventional Embodiment FIG. 5 shows a cross-sectional view of a conventional pencil. Unlike the first to third embodiments, the shaft member A12 and the shaft member B13 employ the same type of material or the same specific gravity.

It is a general view of the present invention and a conventional circular pencil. It is sectional drawing of 1st Embodiment of the pencil of this invention. It is sectional drawing of 2nd Embodiment of the pencil of this invention. It is sectional drawing of 3rd Embodiment of the pencil of this invention. It is sectional drawing of the pencil which is a conventional embodiment.

Explanation of symbols

10 Pencil 11 Shaft body 12 Shaft member A
13 Shaft member B
20 Solid core 21 Cross-sectional center position

Claims (3)

The central part of the shaft body 11 is a pencil having a solid core for writing, the section from the shaft body end surface to the shaft body end surface opposite to the shaft body end surface is substantially the same shape, and is substantially point symmetric from the center of the cross section. A pencil having a feature that forms a shaft body having a cross-section with the shape, and the position of the center of gravity of the shaft body does not coincide with the cross-sectional center of the shaft body.   The pencil according to claim 1, wherein the member formed around the solid core in the shaft body is composed of two parts, each formed of a material having different specific gravity. The pencil according to claim 2, wherein a cross-sectional shape of the shaft body is circular.

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