JP2017170809A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument in which a writing body accommodated in a barrel body can be easily exchanged, and assemblability of the barrel body is good.SOLUTION: A writing instrument comprises a barrel body and a writing body accommodated in the barrel body. The barrel body comprises a front shaft, an intermediate shaft which is connected to a rear end part of the front shaft, and a rear shaft which is connected to a rear end part of the intermediate shaft, and the writing body can be exchanged in such a manner that the intermediate shaft and the rear shaft are detachably connected to each other by screwing. The front shaft and the intermediate shaft are connected to each other in such a manner that a protrusion provided on an inner wall of the rear end part of the front shaft and a protrusion provided on an outer wall of a front end part of the intermediate shaft are run-over engaged with each other, and a concaved groove provided in the rear of the protrusion of the front shaft and a projection provided in the rear of the protrusion of the intermediate shaft are engaged with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument including a shaft cylinder main body and a writing body accommodated in the shaft cylinder main body.

  In the writing instrument, in Japanese Patent Laid-Open No. 09-315077, "writing instrument", the front shaft and the rear shaft are screwed together as the shaft cylinder body, and the front shaft and the rear shaft are removed to be disposed in the shaft cylinder. A writing instrument is disclosed in which the cursive body is detachable. In addition, with regard to a writing instrument in which such a writing body can be exchanged, the applicant of the present application also disclosed in Japanese Patent Application Laid-Open No. 2007-253548, “Shaft cylinder of writing instrument”, by screwing a tip member and a front shaft as a shaft cylinder body, A shaft cylinder of a writing instrument is disclosed in which a writing body disposed in a shaft cylinder is detachable by screwing a rear shaft.

  By the way, as a writing instrument, it is easy for the user to use, such as attaching a grip to the gripping part of the shaft tube, decorating the outer surface of the shaft tube, and making it possible to visually recognize the remaining ink amount of the writing body from the outside. In order to attract interest, various elements are required.

JP 09-315077 A JP 2013-49193 A

  However, it is extremely difficult because it is necessary to select the material to be used for the writing cylinder in consideration of various factors such as materials that are easily decorated, highly transparent materials, and compatibility with materials used for grips. Met.

  In view of these problems, it is conceivable to connect a plurality of members as the shaft of the writing instrument. However, when replacing the writing body, for example, when the front shaft and the rear shaft that are screwed are removed. If the rear end of the cursive body protrudes to the outside, there is a risk of falling when the cursive body is replaced. Moreover, in patent document 2, a tip member and a front axis | shaft, a front axis | shaft, and a rear axis | shaft may remove | deviate simultaneously, and there existed a subject in the surface of the exchange workability | operativity of a writing body.

  An object of the present invention is to provide a writing instrument in which a writing body accommodated in a shaft tube main body can be easily exchanged and the shaft tube main body is easily assembled.

  In order to achieve the above object, first, the present invention provides a writing instrument including a shaft cylinder body and a writing body accommodated in the shaft cylinder body, the shaft cylinder body including a front shaft, An intermediate shaft connected to the rear end portion of the front shaft, and a rear shaft connected to the rear end portion of the intermediate shaft, the intermediate shaft and the rear shaft being detachably connected by screwing The cursive body is replaceable, and the front shaft and the intermediate shaft have a protrusion provided on the inner wall of the rear end portion of the front shaft, and a protrusion provided on the outer wall of the front end portion of the intermediate shaft. The groove is connected by overriding engagement, and a concave groove provided behind the protrusion of the front shaft engages with a protrusion provided behind the protrusion of the intermediate shaft.

  According to the first configuration, since the front shaft, the intermediate shaft, and the rear shaft are divided into at least three parts, it is possible to easily make the material and the shape according to each purpose. Specifically, because the front shaft is always in contact with the grip because the grip is attached, the compatibility with the grip is taken into consideration, and the intermediate shaft considers transparency in order to improve the visibility inside the shaft cylinder. In the rear shaft, the intermediate shaft and the rear shaft are screwed together. Therefore, when the rear shaft is provided with a screwing property and a retracting mechanism, the operability of the retracting mechanism can be taken into consideration. The intermediate shaft and the rear shaft are detachably connected by screwing so that the writing body can be exchanged. The front shaft and the intermediate shaft are provided on the inner wall of the rear end portion of the front shaft. The protrusion and the protrusion provided on the outer wall of the front end portion of the intermediate shaft are connected by getting over and engaged, and the groove provided behind the protrusion of the front shaft and the protrusion of the intermediate shaft Since the front shaft does not rotate with respect to the intermediate shaft when the intermediate shaft and the rear shaft are screwed together by engaging the protrusion provided at the rear, the front shaft of the shaft cylinder is grasped and written. The body can be exchanged.

  Second, the concave groove of the front shaft has a narrower circumferential width from the rear to the front of the front shaft, and the projection of the intermediate shaft has a narrower width from the rear to the front of the intermediate shaft. It is characterized by becoming.

  According to the second configuration, the concave groove of the front shaft has a circumferential width that decreases from the rear to the front of the front shaft, and the projection of the intermediate shaft extends from the rear to the front of the intermediate shaft. Since the width becomes narrower, it is easy to insert the protrusion of the intermediate shaft into the groove on the front shaft by inserting the intermediate shaft from the rear of the front shaft. After insertion, the width of the groove on the front shaft is reduced. The portion with the narrow width of the projection of the intermediate shaft engages with the portion to prevent the rotation of the front shaft and the rear shaft, and further, the intermediate shaft is pushed forward of the front shaft, The projection of the intermediate shaft gets over and the fitting is finished. Therefore, the front shaft and the rear shaft can be coupled stably.

  Thirdly, the rear end of the intermediate shaft is characterized in that the cursive body is positioned in front of the position of the rear end.

  According to the third configuration, when the intermediate shaft and the rear shaft are removed by screwing the intermediate shaft and the rear shaft, the rear end of the intermediate shaft is positioned in front of the position of the rear end. Since the rear end portion of the cursive body is exposed outward from the rear end, the cursive body can be easily grasped and the cursive body can be easily replaced. The length from the front end of the front shaft to the rear end of the intermediate shaft is preferably longer than 50% of the total length of the cursive, and more preferably longer than 70% of the total length of the cursive. . In view of grasping the rear end of the cursive with a finger, the length is preferably 90% or less of the entire length of the cursive.

  The present invention can provide a writing instrument in which the writing body accommodated in the shaft tube main body can be easily exchanged and the shaft tube main body is easily assembled.

It is a longitudinal cross-sectional view using the writing instrument of Embodiment 1. FIG. 2 is an AA enlarged cross-sectional view partially omitted in FIG. 1. FIG. 2 is an enlarged cross-sectional view in which a part of a front shaft in FIG. 1 is omitted. It is the expansion external view which abbreviate | omitted a part of intermediate shaft in FIG. It is explanatory drawing which shows the connection state of a front shaft and an intermediate shaft.

  Next, embodiments 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.

  As shown in FIG. 1 to FIG. 5, the writing instrument 1 of the present embodiment is screwed to the front shaft 2, the transparent intermediate shaft 3 connected to the front shaft 2 by fitting over the front shaft 2, and the intermediate shaft 3. A shaft cylinder main body having an opaque rear shaft 4, an opaque grip 12 surrounding the outer surface of the front shaft 2 in the circumferential direction, and a writing body 9 accommodated in the shaft cylinder main body so as to be able to appear and retract are provided. The front shaft 2, the intermediate shaft 3, and the rear shaft 4 are made of resin, and the grip 12 is made of rubber. In the illustrated example, the writing instrument 1 is a ballpoint pen.

  The front shaft 2 has an opening 2 </ b> A through which a writing portion (ballpoint pen tip) 11 of the writing body 9 can project at the front end. Further, the writing body 9 is arranged to be urged rearward in the axial direction (right side in FIG. 1) of the axial tube main body by a coil spring 8 disposed in the front shaft 2. A part of the cursive body 9 is visible from the outside through the intermediate shaft 3.

  The retracting mechanism is provided with a cam mechanism (not shown) that engages with the rotating cam 7 and a rotating cam 7 for switching the protruding and retracting of the writing portion 11 of the writing body 9 in the rear shaft 4. . When the knock member 6 is pressed (knock operation) with the writing portion 11 of the writing body 9 immersed in the front shaft 2 (see FIG. 1), the rotating cam 7 slides along the cam groove, and writing is performed. The writing part 11 of the body 9 protrudes outward from the opening 2A of the front shaft 2, and further, the rotating cam 7 is rotated by the action of the cam mechanism, whereby the writing body 9 toward the rear in the axial direction of the shaft main body. The relative movement is prohibited, and this protruding state is maintained even after the pressing operation is completed. When the knocking member 6 is pressed again (knocking operation) in this projecting state, the cam body is allowed to move the writing body 9 in the axially rearward direction by the cam mechanism, and the coil spring 8 is attached. The writing body 9 and the knock member 6 are pushed back in the axial direction by the force, so that the initial state is restored.

The writing body 9 will be described in detail. At the front end portion of the ink containing cylinder 10, a writing portion 11 made of a ballpoint pen tip that rotatably holds a φ0.5 mm ball is mounted. Although not shown in the ink containing cylinder 10, a shear rate of 5 sec ⁻ under an environment of 20 ° C. using AR-G2 (stainless steel 40 mm ² ) manufactured by TA Instruments Inc. ^A black oil-based ballpoint pen ink having an ink viscosity of 15000 mPa · s measured in ¹ is directly contained.

  On the inner wall of the rear end portion of the front shaft 2, two protrusions 2 </ b> B that protrude circumferentially inward are provided at different positions in the longitudinal direction. (2BA, 2BB) Further, on the outer wall of the front end portion of the intermediate shaft 3, the protrusions 3A corresponding to the protrusions 2BA, 2BB of the front shaft 2 and projecting circumferentially outward are different in the longitudinal direction. The front shaft 2 and the intermediate shaft 3 are provided at two positions (3AA, 3AB) at positions, the protrusions 2BA and 2BB provided on the inner wall of the rear end portion of the front shaft 2, and the outer wall of the front end portion of the intermediate shaft 3 The projections 3AA and 3AB provided in the are connected by getting over and engaging.

  Further, on the rear side of the projection 2B of the front shaft 2, there are provided concave grooves 2C extending in the longitudinal direction at eight equal circumferential positions. Further, on the rear side of the protrusion 3A of the intermediate shaft 3, there are provided protrusions 3B extending in the longitudinal direction at four equal positions in the circumferential direction. When the front shaft 2 and the intermediate shaft 3 are engaged with each other, the concave groove 2C of the front shaft 2 and the protrusion 3B of the rear shaft 3 are engaged. The intermediate shaft 3 and the rear shaft 4 are detachably screwed with a male screw portion 3C provided on the outer surface of the rear end portion of the intermediate shaft 3 and a female screw portion 4A provided on the inner surface of the front end portion of the rear shaft 4. ing. A clip 5 is attached to the rear part of the rear shaft 4.

  The connecting method of the front shaft 2 and the intermediate shaft 3 is as follows. First, the intermediate shaft 3 is inserted from the rear of the front shaft 2 and pushed in, so that the intermediate direction in the narrow direction on the front end side of the concave groove 2C of the front shaft 2 The narrowness of the protrusion 3B of the shaft 3 is guided to engage the concave groove 2C of the front shaft 2 with the protrusion 3B of the rear shaft 3, and the protrusion 2B of the front shaft 2 and the protrusion 3A of the intermediate shaft 3 Are fitted over and the connection is terminated. By making the number of the concave grooves 2C of the front shaft 2 larger than the protrusions 3B of the rear shaft 3, the protrusions 3B of the rear shaft 3 can be easily inserted into the concave grooves 2C of the front shaft 2.

  The front shaft 2 and the intermediate shaft 3 will be described in detail. The concave groove 2C of the front shaft 2 has a narrower circumferential width from the rear end 2D direction of the front shaft 2 toward the front, and corresponds to the concave groove 2C. The protrusion 3 </ b> B of the intermediate shaft 3 is also narrower (L> M) from the rear to the front of the intermediate shaft 3. Therefore, by inserting the intermediate shaft 3 from the rear of the front shaft 2, the projection 3B of the intermediate shaft 3 can be easily inserted into the concave groove 2C of the front shaft 2, and after the insertion, the concave groove 2C of the front shaft 2 is inserted. The narrow portion of the projection 3B of the intermediate shaft 3 is guided in the narrow direction on the front end side, and the groove 2C of the front shaft 2 and the projection 3B of the rear shaft 3 are engaged with each other. The rotation of the rear shaft 3 with respect to 2 or the rotation of the front shaft 2 with respect to the rear shaft 3 can be prevented.

  Further, the protrusion 3B of the intermediate shaft 3 has a front end surface 3BA having a spire shape in a longitudinal section. Therefore, the intermediate shaft 3 is inserted into the groove 2C of the front shaft 2 by inserting the intermediate shaft 3 from the rear of the front shaft 2. 3 is preferable because the projection 3B can be easily inserted and the assemblability is improved.

  In order to replace the writing body 9, for example, the front shaft 2 and the rear shaft 4 are gripped, and the front shaft 2 and the intermediate shaft 3 are rotated by applying rotation to the opposite sides where the intermediate shaft 3 and the rear shaft 4 are screwed. Since the rotation prevents the intermediate shaft 3 and the rear shaft 4 from being screwed together, the writing body 9 can be removed from the rear end of the intermediate shaft 3 and replaced.

  In the present embodiment, the length from the front end of the front shaft 2 to the rear end of the intermediate shaft 3 is 90% of the total length of the writing body 9, and when the intermediate shaft 3 and the rear shaft 4 are removed. Moreover, the length of the cursive 9 exposed from the rear end of the intermediate shaft 3 was about 10% of the total length of the cursive.

  In addition, a resin material known as a shaft tube of a writing instrument such as polypropylene, polycarbonate, acrylonitrile styrene, polyethylene terephthalate, or the like can be appropriately selected and used for the above-described shaft tube body. Specifically, in consideration of the visibility in the shaft cylinder, the intermediate shaft 3 has polycarbonate and ABS resin, and the front shaft 2 has grip mounting properties, and the front shaft 2 and the intermediate shaft 3 get over. In view of the engagement, the polypropylene, acrylonitrile styrene, and the rear shaft 4 are preferably made of polycarbonate or acrylonitrile styrene in view of decorating properties such as printing and sticking of stickers and sliding properties of the intrusion mechanism.

  The writing instrument of the present invention is not limited to the type of ink and the pen tip, and can be widely implemented as a writing instrument.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Front shaft 2A Opening part 2B Protrusion part 2C Concave groove 3 Intermediate shaft 3A Protrusion part 3B Protrusion 3C Male thread part 4 Rear axis 4A Female thread part 5 Clip 6 Knock body 7 Rotating cam 8 Coil spring 9 Writing body 10 Ink receiving cylinder 11 Writing part 12 grip

Claims (3)

A writing instrument comprising a shaft cylinder main body and a writing body accommodated in the shaft cylinder main body, wherein the shaft cylinder main body is connected to the front shaft and a rear end portion of the front shaft. A shaft, and a rear shaft connected to a rear end portion of the intermediate shaft, wherein the intermediate shaft and the rear shaft are detachably connected by screwing, and the writing body is replaceable, The front shaft and the intermediate shaft are connected by a projecting portion provided on the inner wall of the rear end portion of the front shaft and a projecting portion provided on the outer wall of the front end portion of the intermediate shaft being engaged with each other. A writing tool, wherein a concave groove provided behind the projection of the intermediate shaft engages with a projection provided behind the projection of the intermediate shaft. The concave groove of the front shaft has a circumferential width that decreases from the rear to the front of the front shaft, and the protrusion of the intermediate shaft has a width that decreases from the rear to the front of the intermediate shaft. The writing instrument according to claim 1. The writing instrument according to claim 1 or 2, wherein the rear end of the intermediate shaft is positioned forward of the writing body relative to the position of the rear end.

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