JP2014079911A - Barrel of writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument having a grip that has excellent assemblability and is changeable in accordance with user's liking, with a simple structure.SOLUTION: In a barrel of a writing instrument in which a grip constituted of a double layer structure of an inner grip comprising a soft material and an outer grip comprising a soft material for covering the inner grip is disposed on a holding part of a barrel body, and a snout member is mounted on the front of the holding part, the grip is constituted by arranging a plurality of grip bodies on the holding part in a detachable manner, and the plurality of grip bodies are externally fitted to the holding part in a rotatable manner respectively, and the holding part is provided with a spiral groove.

Description

  The present invention relates to an axial tube of a writing instrument in which a grip is provided in a grip portion of the writing instrument.

  2. Description of the Related Art Conventionally, a writing instrument shaft tube in which a grip is disposed in a gripping part of a writing instrument is well known. In such a writing tool shaft, the present applicant has disclosed a writing tool shaft tube in which a grip has a two-layer structure of an inner layer and an outer layer in Japanese Patent No. 4602250, “Shaft Tool Shaft”.

  By the way, there are various user preferences such as desired color, shape, ball diameter, etc. In order to answer such user requests, it is necessary to prepare multiple types of writing colors and shaft tube colors even in the same form. is there. In particular, in recent years, a writing instrument that can be changed by a user according to his / her preference is also disclosed depending on parts.

  Similarly, in the writing tool shaft, Japanese Utility Model Publication No. 6-50884 “Shaft tube in writing tool” discloses a writing tool in which a plurality of grip bodies having different outer surface treatments are detachably arranged in accordance with the user's preference. ing.

Japanese Patent No. 4602250 Japanese Utility Model Publication No. 6-50884

  However, if a plurality of grip bodies such as Patent Document 2 are simply detachably disposed, if the grip is directly gripped during writing or the like, the grip body may be inadvertently rotated due to writing pressure or the like. In view of these problems, it is conceivable to increase the mounting force between the grip and the gripping portion of the shaft tube and to provide a rotation prevention mechanism so as not to rotate easily.

  The present invention has been made in view of these prior arts, and it is an object of the present invention to provide a writing instrument having a simple structure that has a good assembling property and has a grip that can be changed according to user's preference.

  In order to solve the above problems, the present invention provides a grip composed of a two-layer structure of an inner grip made of a soft material and an outer grip made of a soft material that covers the inner grip, in the grip portion of the shaft tube body. In the writing tube shaft in which a tip member is mounted in front of the grip portion, the inner grip is configured by detachably arranging a plurality of grip bodies on the grip portion, and the plurality of the grips. A grip body is rotatably fitted to the grip portion individually, and a spiral groove is provided in the grip portion.

  In addition, one grip body located at the rearmost side of the grip portion of the plurality of grip bodies is externally fitted to the grip portion by press fitting, and the other grip body adjacent to the front of the one grip body. However, the grip part is press-fitted or loosely fitted, and the other grip body is externally fitted to be rotatable with a smaller rotational force than the one grip body.

  Furthermore, the spiral groove is provided in the longitudinal direction from the front end of the grip portion to a position forward of the rear end of the one grip body and a position rearward of the front end of the one grip body. To do.

  According to the first configuration of the present invention, a grip composed of a two-layer structure of an inner grip made of a soft material and an outer grip made of a soft material covering the inner grip is disposed in the grip portion of the shaft tube main body. In the writing tube shaft in which a tip member is mounted in front of the grip portion, the inner grip includes a plurality of grip bodies detachably arranged on the grip portion, and the plurality of grips. Since the body is externally fitted to the gripping part so as to be freely rotatable, and the gripping part is provided with a spiral groove, the contact resistance between the inner grip and the gripping part is reduced, and a plurality of users are provided. It is easy to arrange the grip body in the grip portion, and it is possible to prevent the grip body from being twisted during the placement or the like.

  In addition, for example, when the grip body is decorated with letters, patterns, etc., and the inner grip is in one form, the user does not care about the position in the rotation direction, and the grip body is gripped by the shaft tube. Since the grip body can be rotated to a desired position in a stable state after being externally fitted to the part, a gap is formed between the grip body inner surface and the grip part outer surface by the spiral groove formed in the grip part. It can be rotated easily.

  According to a second configuration of the present invention, one grip body located at the rearmost of the gripping portions of the plurality of grip bodies is disposed by press-fitting into the gripping portion, and the one grip body The other grip body that is adjacent to the front of the gripping part is press-fitted or loosely fitted into the grip portion, and the other gripping body is externally fitted so as to be rotatable with a smaller rotational force than the one grip body. After the rearmost grip body is disposed, the other grip body can be externally fitted and only the other grip body can be easily rotated.

  According to a third configuration of the present invention, in the second configuration, the spiral groove is more forward than the rear end of the one grip body than the front end of the one grip body and more than the front end of the one grip body. Even if the grip body has the same inner diameter, the outer diameter of the gripping part is constant, the spiral pitch, and the spiral depth are the same, the pressure of one grip body and the other grip body is the same. Since the input can be made different, it is possible to easily manufacture a grip body or to form a spiral.

  The soft material of the present invention includes rubber-like elastically deformable silicone rubber, natural rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, polyethylene resin, other synthetic rubbers, thermoplastic elastomers, etc. What is necessary is just to select suitably from the elastic bodies generally known as a grip member of a writing instrument, and the inner grip and the outer grip may be formed of the same type or different types.

  In the present invention, since the inner grip can be visually recognized from the outside by disposing the transparent or translucent outer grip, compared with the case where the inner grip having the common outer shape and / or color pattern is disposed, At least, the decorative effect can be improved by changing the outer shape and / or the color pattern of the inner grip adjacent in the axial direction, which is preferable. If the outer grip is formed of a transparent or translucent soft material and the inner grip is formed of a transparent or translucent soft material, the gripping portion of the shaft tube can be seen through, and a new appearance can be expressed.

Further, in the present invention, in order to rotatably fit the plurality of inner grips to the grip portion of the shaft tube, the inner diameter of the inner grip is preferably larger than the outer diameter of the grip portion of the shaft tube. However, you may arrange | position by press-fitting in the holding part of a shaft cylinder. However, in order to allow the user to easily rotate, the force required to rotate the grip body is preferably 300 gf · Cm or less, more preferably 250 gf · Cm or less. The force for rotating the grip body can be measured using a torque meter manufactured by Tohnichi Corporation.

  In addition, the plurality of grip bodies may be a plurality of grip bodies having the same shape or different outer shapes, but it is preferable to form one form or pattern by arranging the grip bodies in series.

  The object of the present invention is to provide a writing instrument with a simple structure that has a good assembly and a grip that can be changed by the user according to preference.

FIG. 3 is an external view showing a shaft tube of the writing instrument of Example 1. It is a principal part expanded sectional view in which a part was omitted in FIG. It is the figure made into the partial cross section which shows the state which removed the inner grip and the outer grip in FIG. It is a figure which shows the arrangement | positioning state of the inner grip and outer grip in FIG. It is AA sectional drawing in FIG.

  Next, embodiments of the shaft cylinder of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

  The shaft cylinder 1 of the writing instrument according to the embodiment shown in FIGS. 1 to 5 has a head divided into a plurality of parts within a shaft body obtained by screwing a brass front shaft 2 and a polycarbonate rear shaft 3 together. A chuck 10 that is formed to be expandable, a fastening ring 11 that is externally fitted to the head of the chuck 10, a pipe-shaped core tank 12 that is press-fitted and fixed to the rear part of the chuck 10, and a washer 13 that receives the fastening ring 11. The mechanism part which consists of the spring 14 stretched between the washer 13 and the core tank 12 comprises, and the shaft cylinder main body is shaken to a longitudinal direction, and the gravity of the weight body 13 acts on the front-end | tip opening part direction of the front shaft 2. Alternatively, it is a mechanical pencil barrel that allows a lead core (not shown) to be drawn out by pressing the knock body 8 protruding from the rear shaft 3. An outer cylinder 4 is disposed on the rear shaft 3, and a rotation stopper 9 is formed on the outer cylinder 4.

  The front shaft 2 forms a grip portion 2A having a small diameter, and the grip portion 2A has a cylindrical shape made of silicone rubber colored in different colors, and has the same shape and grip bodies of different colors of blue, yellow and red 7A, 7B, 7C are arranged in series, and the inner grip 7 is externally fitted to the grip portion 2A of the front shaft 2 so as to be rotatable, and a translucent silicone rubber is formed on the outer side of the inner grip 7. The outer grip 6 is also rotatably fitted to the grip portion 2A of the front shaft 2, and the outer grip 6 and the inner grip 7 are laminated. In addition, the external thread 6 and the internal grip 7 are disposed on the grip 2A of the front shaft 2 by detachably attaching the female thread of the base 5 to the external thread 2B formed at the front end of the front shaft 2. A shaft cylinder 1 is obtained. Further, by arranging three grip bodies 7A, 7B, and 7C in series, one pattern is formed in which display portions provided on the outer surfaces of the grip bodies 7A, 7B, and 7C are continuous.

  Specifically, the small-diameter gripping portion 2A is formed so that the outer diameter is substantially constant (tip outer diameter G = rear outer diameter H), and the inner diameter L of the plurality of grip bodies 7A, 7B, 7C is The diameter is approximately the same. Since the inner diameter L of the grip bodies 7A, 7B, and 7C is smaller than the outer diameters G and H of the grip portion 2A, the grip bodies 7A, 7B, and 7C are externally fitted to the grip portion 2A by press-fitting. The grip bodies 7A, 7B, and 7C have an R-shaped chamfered portion R1 on the outer edge of one end surface and the other end surface, and an R-shaped chamfered portion on the inner edge of the other end surface. R2 is provided to further reduce the rotational resistance.

  When one grip body 7C is disposed from the front of the gripping part 2A, the resistance is reduced by the spiral groove 2E provided in the gripping part 2A, and therefore the comparison is made up to the rear end part of the gripping part 2A provided with the spiral groove 2E. Reach the target smoothly. Thereafter, in the press-fitting portion 2F not provided with the spiral groove, the pushing force is increased, but the pushing force is provided to the front of the rear end of the one grip body 7C and the position behind the tip of the one grip body 7C. It is made small and can be press-fitted by the press-fitting part 7F at the rear end of the grip part 2A and can be rotatably fitted.

  In addition, the inner diameter L of the other grip body 7B is press-fitted into the gripping portion 2A of the opposite shaft cylinder, but the spiral groove 2E is located on the entire inner surface of the grip body 7B. The grip body 7B can be rotated with a smaller rotational force, and only the other grip body 7B can be easily rotated.

  In addition, when the base 5 is screwed, the outer grip 6 is sandwiched between the rear end of the base 5 and the outside 2C of the front shaft 2, and the other grip body 7A, which is the foremost, is held by the inner flange 6A of the outer grip 6. The outer grip 6 is compressed and sandwiched with the front end surface abutted and the rear end surface of the last grip body 7C abutted by the stepped portion 2D of the front shaft 2, and when writing or moving. The inner grip 7 and the outer grip 6 are prevented from rotating carelessly.

  In order to rotate or replace the inner grip 7, the outer grip 6 is removed after the base 5 is removed. In this state, the desired one grip body 7A, the other grip body 7B, or the other grip body 7C is rotated. Alternatively, the inner grip 7 can be removed and replaced with a new one or a new grip body (not shown). The pressure input to the grip portion 2A is the same between the one grip body 7A and the other grip body 7B, but one grip body 7A can be rotated with a smaller rotational force than the other grip body 7B. It is preferable.

  Also, before the base 5 is screwed, the outer grip 6 can be rotatably fitted on the front shaft 2 to enhance the decorative effect with the inner grip 7. In addition, since the outer grip 6 is fitted after the inner grip 7 is fitted, the outer grip 6 is configured such that the outer diameter M of the plurality of inner grips 7 is smaller than the inner diameter N of the opposing outer grip 6. It is preferable that the inner grip 7 is difficult to rotate when rotating.

  Furthermore, the inner surface of the outer grip 6 is formed in a taper shape that increases in diameter toward the outside, and the outer surface of the inner grip 7 is formed into a slate shape having a substantially constant outer diameter. The gap with the outer surface becomes non-uniform in the longitudinal direction, and the grip feeling can be changed by the difference in the longitudinal direction.

  In the above embodiment, the inner grip 7 has a cylindrical shape, but various shapes are conceivable, such as a triangular cross-sectional shape and an arbitrarily changed thickness. Furthermore, a plurality of protrusions may be formed on the outer surface of the inner grip of the present invention. Moreover, the number of grip bodies is not limited to three, and can be selected and used as appropriate, such as two or four.

  Furthermore, it is conceivable that the grip body has a hardness (JIS A) 10, 30, 50, 70, etc., and a plurality of the same hardness or a combination of different hardnesses to form an inner grip. As the outer grip to be combined with these inner grips, various soft grips such as hardness (JIS A) 10, 30, 50, 70, etc., the same hardness as the inner grip, or a combination of different hardnesses are used. It becomes possible.

  In this embodiment, the outer diameter of the gripping portion is substantially constant, but it is formed in a tapered shape that expands from the front end side toward the rear, the inner diameter of the inner grip 7 is substantially constant, and the outer diameter of the gripping portion front end Is smaller than the inner diameter of the inner grip and the outer diameter of the rear end of the gripping part is larger than the inner diameter of the inner grip, so that when one grip body is placed and fitted from the front of the gripping part, one grip body Can be smoothly fitted up to the tip and center of the gripping part, and press-fitted at the rear end of the gripping part to be rotatably fitted, and the inner diameter of the other gripping body is the gripping of the opposite shaft cylinder. Since it is larger than the outer diameter of the part, it can be rotatably fitted in a loosely fitting manner to the gripping part of the shaft tube. Therefore, the other grip body externally fitted in a loose fit can be rotated with a smaller rotational force than the one grip body externally fitted by press fitting, and only the other grip body can be easily rotated. Further, the material of the shaft tube is not particularly limited, but it is particularly effective when the gripping portion is made of metal because it is difficult to provide fine irregularities.

  Further, in this embodiment, when the base is attached, the outer grip that is rotatably fitted is compressed by the outer end of the base and the outer stage of the front shaft, and the outer grip is easily rotated. However, the outer grip may be easily rotatable after the base is mounted. When the grip is gripped, the outer grip and the grip body are deformed, and the grip body is deformed so as to fill the spiral groove, so that it is possible to suppress the feeling during writing and the twist of the inner grip.

  The pitch of the spiral groove provided in the grip portion is not particularly limited, but if it is smaller than 0.1 mm, it is difficult to form the spiral groove, and if it exceeds 1.0 mm, the contact between the inner grip and the grip portion is difficult. Since the resistance reduction effect tends to be small, 0.1 mm to 1.0 mm is preferable, and 0.3 mm to 0.8 mm is more preferable. Further, the depth of the groove is not particularly limited, and may be a uniform depth such as 0.01 mm to 0.5 mm or a partially different depth. In addition, the gripping part has a shape that has grinding traces caused by chatter during processing of the spiral groove and grinding traces that serve as a constriction. This is preferable because the effect of reducing the contact resistance between the grip and the grip portion is increased.

  The shaft cylinder of the writing instrument of the present invention is not limited to a knock-type mechanical pencil, but can be used for a shaft cylinder of various writing instruments such as a ballpoint pen.

DESCRIPTION OF SYMBOLS 1 Writing cylinder 2 Front shaft 2A Grasp part 2B Male thread part 2C Outer stage 2D Step part 2E Spiral groove 2F Press-fit part 4 Rear axis 5 Base 6 Outer grip 7 Inner grip 7A, 7B, 7C Grip body L Inner grip inner diameter M In Grip outer diameter N Outer grip inner diameter G Grip end front outer diameter H Grip rear end outer diameter

Claims (3)

A grip composed of a two-layer structure consisting of an inner grip made of a soft material and an outer grip made of a soft material that covers the inner grip is disposed on the grip portion of the shaft barrel main body, and a lip member is mounted in front of the grip portion. In the writing instrument shaft, the inner grip is configured by detachably arranging a plurality of grip bodies on the grip portion, and the plurality of grip bodies are individually provided with respect to the grip portion. A shaft cylinder of a writing instrument that is rotatably fitted and is provided with a spiral groove in the grip portion. The rear end portion of the gripping portion is not provided with the spiral groove, a press-fit mounting portion is provided, and one grip body positioned at the rearmost of the gripping portions of the plurality of grip bodies is provided in the press-fit mounting portion. The other grip body that is externally fitted by press-fitting and is adjacent to the front of the one grip body is press-fitted or loosely fitted to the grip portion, and the other grip is more than the one grip body. The shaft cylinder of the writing instrument according to claim 1, wherein the body is externally fitted so as to be rotatable with a small rotational force. The said spiral groove is provided in the longitudinal direction from the front-end | tip of the said holding | grip part to the position ahead rather than the front-end | tip of one grip body, and the back | inner side of the one-side grip body. A shaft cylinder of the writing instrument according to 1 or 2.

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