JP3123587U - Intrusion type multi-core writing instrument - Google Patents

Abstract

Provided is a retractable writing instrument that can easily prevent shaft runout caused by eccentricity by aligning the axis of a core that has been protruded and retracted during use.
A retractable multi-core writing instrument comprising a cylindrical body in which a plurality of cores made of an elastic material are housed, and a mechanism for allowing the selected one core body to protrude from the cylindrical body. Protrusions are provided on the inner peripheral surface of the core and the outer peripheral surface of the core body, respectively, so that the core body convex portion comes into contact with the cylindrical body convex portion so that the tip end side of the core body and the axis of the cylindrical body coincide with each other. A retractable multi-core writing instrument characterized by elastically deforming the core body.
[Selection] Figure 2

Description

  The present invention is a retractable multi-core writing instrument having a mechanism for projecting and retracting one core selected at the time of use from a cylinder, and more specifically, the axis of the projecting core coincides with the axis of the cylinder Thus, the present invention relates to a configuration of a retractable multi-core writing instrument that prevents shaft runout caused by eccentricity.

  In the conventional retractable multi-core writing instrument, the axial line of the cylindrical body that houses the core body does not coincide with the axial line of the core body during storage because of its configuration. Therefore, when one core is made to appear and disappear from the cylinder during use, the core of the elastic material is bowed in the vicinity of the opening, and the tip of the core is exposed to the outside in a slightly inclined state. Therefore, there was no stability and a smooth writing comfort could not be obtained. Further, when such a writing instrument is used for a long time, there is a problem that fatigue tends to accumulate.

  As a solution to such a problem, Patent Document 1 discloses a multi-core writing instrument in which a chuck member for gripping the core body is disposed in the vicinity of the opening where the core body is exposed to the outside.

However, since this multi-core writing instrument has many components and a complicated structure, the number of manufacturing processes increases and the cost increases in implementation. It wasn't.
JP-A-9-66696

  Thus, the present invention overcomes the disadvantages of conventional retractable multi-core writing instruments, makes it possible to easily prevent shaft runout caused by eccentricity by matching the axes of the retracted core and the cylindrical body during use. The issue is to provide a haunting writing instrument.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and includes a cylindrical body that houses a plurality of cores made of an elastic material therein and a mechanism that allows a single selected core body to protrude from the cylindrical body. A core writing instrument, wherein a convex portion is provided on each of an inner peripheral surface of the cylindrical body and an outer peripheral surface of the core body, and the core convex portion abuts on the cylindrical convex portion, thereby the core body leading end side and the core body A retractable multi-core writing instrument characterized in that the core body is elastically deformed so that the axes of the cylindrical bodies coincide with each other.

  The retractable multi-core writing instrument of the present invention has convex portions on the inner peripheral surface of the cylindrical body and the outer peripheral surface of the core body. When the part comes into contact, the core body is elastically deformed, and therefore, the axis of the core body that has been protruded and projected coincides with the axis of the cylinder body in the vicinity of the opening where the core body is exposed to the outside. As a result, shaft runout due to eccentricity can be prevented. Due to the effect of preventing the shaft runout, smooth and stable writing comfort can be obtained. In addition, since the protrusion is formed by using the structure of a conventional retractable multi-core writing instrument as it is, it can be easily processed, and thus can be used for an inexpensive off-the-shelf ballpoint pen. It is.

  Hereinafter, an embodiment of the retractable multi-core writing instrument of the present invention will be specifically described with reference to the drawings. Note that the present invention is not limited to these embodiments.

  FIG. 1 is a cross-sectional perspective view showing a retractable multi-core writing instrument according to the present invention, FIG. 2 is a partially enlarged cross-sectional perspective view of the retractable multi-core writing instrument according to the present invention, and FIG. AA sectional view, FIG. 4 is a partially enlarged sectional view showing a second aspect of the retractable multi-core writing instrument according to the present invention, FIG. 5 is a partially enlarged sectional view showing the third aspect. It is a thing. In each figure, 1 is a cylindrical body, 2 is a core body, 3 is a cylindrical body convex part, 4 is a core body convex part, 5 is a core body fixing platen, 6 is a knock member, and 7 is a cylindrical body. 8 is the tip of the core body, 31 is the top of the convex part of the cylindrical body, 41 is the top of the convex part of the core, and x is the top of the convex part of the cylindrical body to the top of the convex part of the core. The distance indicates y, and the distance y indicates the distance from the leading end of the core body during storage to the leading end during use.

  As shown in FIG. 1 and FIG. 3, the retractable multi-core writing instrument of the present embodiment accommodates four core bodies 2 formed of an elastic material inside a cylindrical body 1. The user uses one core body 2 arbitrarily selected from the core body 2 so as to appear and disappear from the cylinder body 1. The mechanism for causing the core body 2 to appear and disappear from the cylinder body 1 is a so-called knock type, and pushes down the knock member 6 coupled to the rear end of the selected core body 2 toward the front end of the cylinder body. As a result, it is made to appear and disappear from the front end portion 7 of the cylindrical body. The material of the core body 2 is not particularly limited as long as it is an elastic material that bends appropriately when the core body 2 is pressed from the side, in addition to generally used polypropylene or the like.

  The core body 2 is provided with a convex portion 4 formed in a semi-elliptical cross section toward the inner peripheral surface of the cylinder 1 on the outer peripheral surface thereof. Further, the cylindrical body 1 is provided with a convex portion 3 formed in a band shape and a semi-elliptical cross section along an inner peripheral surface located below the core convex portion 4.

  The height of the core convex part 4 coincides with the distance from the outer peripheral surface of the core body 2 to the inner peripheral surface of the opposing cylindrical body 1 when stored, while the cylindrical convex part 3 is also higher than the height of the core convex part 4. Are formed identically. Moreover, it is preferable to form the axial length of the core convex part 4 to such a length that does not hinder the elastic deformation of the writing body 2, and in particular, it is desirable to form it in a length of about 3 to 5 mm. For both convex portions, a different material from the cylindrical body 1 and the core body 2 is selected, and after forming the cylindrical body 1 and the core body 2, it may be separately formed by adhesion, but each same material is selected and integrally molded. It is easier to manufacture and is preferable from the viewpoint of strength.

  The positional relationship between the core protrusion 4 and the cylinder protrusion 3 will be described in more detail with reference to FIG. 2. The distance x between the top 41 of the core protrusion 4 and the top 31 of the cylinder protrusion 3 is It coincides with the distance y between the core body tip 12 of the core body 2 when stored and the core body tip 12 when used. In addition, regarding the position of the cylindrical protrusion 3 itself, when the core 2 is elastically deformed during use, the position of the axis of the core 2 and the cylinder 1 in the vicinity of the cylindrical tip 11 is particularly suitable. There is no limitation.

  Next, the operation will be described. The user pushes down the knock member 6 toward the distal end of the cylinder to move the core 2 downward in order to make the arbitrarily selected one core 2 appear and disappear from the cylinder 1. When the core convex part 4 reaches the position where it contacts the cylindrical convex part 3, the core convex part 4 gets over the cylindrical convex part 3 and further moves downward, so the core formed of an elastic material. As shown in FIG. 2, 2 undergoes elastic deformation so that its axis is slid in the axial direction of the cylindrical body 1.

  Since the positional relationship between the core convex part 4 and the cylindrical convex part 3 is as described above, the top part 41 of the core convex part 4 can be used when the core body 2 completely protrudes and can be used from the cylindrical body 1. And the top 31 of the cylindrical protrusion 3 come into contact with each other and stop. However, the core body 2 fits in a substantially vertical state from the lower part of the core body convex portion 4 to the cylindrical body tip 11, and as a result, the axial lines of the core body 2 and the cylindrical body 1 coincide in the vicinity of the cylindrical body tip 11. Will do. The positional relationship of the core body 2 at this time will be described with reference to the cross-sectional view 3. The core body 2 that was positioned in the solid line portion at the time of storage is slid in the axial direction of the cylinder 1 and is in the state of the broken line portion. ing.

  4 and 5 show the second and third embodiments of the retractable multi-core writing instrument of the present invention. In the case of FIG. 4, since the cylindrical protrusion 3 and the core protrusion 4 are each formed in a polygonal cross section, the respective top portions come into surface contact during use, and a more stable feeling can be obtained. On the other hand, the thing of FIG. 5 has the core convex part 4 formed in the cross-sectional shape, and since the coupling area of the core convex part 4 and the core 2 outer peripheral surface becomes smaller, the elastic deformation of the core 2 Has the advantage of becoming easier.

  Further, as shown in FIG. 3, the core convex part 4 is formed so that the top 41 is in contact with the inner peripheral surface vertically, but if the core 2 is used, As a result, there is a possibility that the top portion 41 and the top portion 31 of the cylindrical convex portion 3 do not contact properly. Therefore, in order to prevent such shaft rotation, for example, a shaft rotation preventing means for the core body 2 may be provided at a joint portion between the knock member 6 and the core body 2. Specifically, it is only necessary to form a concavo-convex portion that fits in each of the joint portions of the knock member 6 and the core body 2.

The cross-sectional perspective view which shows the retractable writing instrument which concerns on this invention. A partly enlarged cross-sectional perspective view of the writing tool according to the present invention. AA sectional drawing of FIG. A partially enlarged cross-sectional view showing a second aspect of the retractable writing instrument according to the present invention. A partially enlarged cross-sectional view showing a third aspect of the retractable writing instrument according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ...... Cylinder body 2 ...... Core body 3 ...... Cylinder convex part 4 ...... Core body convex part 5 ...... Writing body fixing plate 6 ...... Knock member 7 ...... Cylinder body front-end | tip part 8 ...... Core body front-end | tip part 31 ... ... the convex part of the cylindrical body 41 ... ... the top part of the convex part of the core x ... ... the distance from the top part of the cylindrical convex part to the top part of the convex part of the core y ... ... Distance to tip
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Claims (5)

  A retractable multi-core writing instrument comprising a cylindrical body containing a plurality of cores made of an elastic material and a mechanism for allowing the selected one core body to protrude from the cylindrical body, the inner peripheral surface of the cylindrical body The core body is provided with a convex portion on the outer peripheral surface of the core body, and the core body convex portion is in contact with the cylindrical body convex portion so that the tip end side of the core body and the axis of the cylindrical body coincide with each other. A retractable multi-core writing instrument characterized by being elastically deformed.   The distance from the top of the cylindrical protrusion to the top of the core protrusion is formed so as to coincide with the distance from the tip of the core when stored to the tip of the core when used. The retractable multi-core writing instrument according to claim 1, wherein   The said cylindrical convex part is formed in the strip | belt shape and cross-sectional semi-elliptical shape along the internal peripheral surface of the said cylindrical body, The said core convex part is formed in the cross-sectional semi-elliptical shape, It is characterized by the above-mentioned. The retractable multi-core writing instrument according to claim 1.   4. The retractable multi-core writing instrument according to claim 1, wherein the axial length of the core convex part is formed to be 3 mm to 5 mm. 5. The retractable multi-core writing instrument according to any one of claims 1 to 4, wherein the core body is provided with a shaft rotation preventing means on a rear end side thereof.

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