JP3933087B2 - Intrusive writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable writing instrument in which a writing body that can be protruded and retracted from a front end of a shaft cylinder is provided, and a lid is opened and closed in conjunction with the retracting operation of the writing object.
[0002]
[Prior art]
As an example, a seal cylinder having a through-hole in which the front portion of the cursive body protrudes and disappears is provided in the main body, a means for passing a thread-like member between the seal cylinder and the main body is provided, and in the vicinity of the tip hole of the seal cylinder. A seal lid is attached so as to be swingable, and a writing body having a tip writing portion and an air hole is accommodated in the main body, and the tip writing portion of the writing body is behind the air hole when retracted into the seal cylinder. An advance / retreat mechanism is provided in which the seal body is disposed at a position, and the writing body is moved forward to be locked in the writing state and retracted to be retracted, and the seal lid and the writing body are disposed after the seal lid is opened. A cap having a drying prevention mechanism characterized by being connected by the thread-like member so that the cursive body can be advanced and, after the seal lid is closed, the cursive body and the member interlocked with the cursive body are prevented from moving backward. There is a less writing instrument (see Patent Document 1) .
[0003]
[Patent Document 1]
Japanese Patent Publication No. 5-68360 (Claims and FIG. 1).
[0004]
[Problems to be solved by the invention]
By the way, in the said conventional structure, the internal diameter of the front-end | tip small diameter part of the seal | sticker pipe | tube vicinity of the front-end | tip writing part and the outer diameter of the small diameter part of a writing body are substantially the same diameter. Therefore, the seal (sealing) between the seal cylinder and the writing body is made by a seal body arranged behind the air hole, and the seal body portion is a sliding portion between the seal cylinder and the writing body. As described above, since the inner diameter of the small diameter portion of the tip of the seal cylinder where the front writing portion is located and the outer diameter of the small diameter portion of the writing body are substantially the same diameter, the portion also slides. That is, the sliding movement between the seal cylinder and the writing body is performed in the vicinity of the tip writing portion. Therefore, there is a high risk that the ink adhering to the tip writing part will wrap around the sliding part due to capillary action or the like, and as a result, drying of the writing part is promoted by solidification of the wrapping ink. There is also a risk that the curling or sliding failure, that is, the writing body's back-and-forth movement (in / out) failure may occur.
[0005]
[Means for Solving the Problems]
The present invention is a retractable writing instrument in which a cursive body that can be projected and retracted from the front end of a shaft cylinder is provided, and a lid is opened and closed in conjunction with the retracting operation of the cursive body. A large diameter that is arranged so that it can move and the cap is attached to the front part of the seal cylinder part, and the capillary action due to the writing part and the inner part of the writing body does not work in the middle part of the inner part of the seal cylinder part The gist is that the writing portion of the cursive body is located in the large diameter portion .
[0006]
[Action]
Although it is a minute space, a space in which capillary action does not act is formed in the vicinity of the writing portion.
[0007]
【Example】
An example of the present invention will be described with reference to FIGS. FIG. 1 is a partial longitudinal sectional view showing a state in which the cursive body 2 is housed. A seal cylinder portion 3 is locked and set on the shaft cylinder 1 through a resilient member 7 so as not to move backward (upper side in the figure) at a stepped portion. An inner rib is formed on the rear inner surface of the seal cylinder portion 3 to keep the outer wall in front of the writing body 2 made of a resin material and hermetically sealed. In addition, three fine wire portions 5 are integrally formed in the seal lid 4 at radial positions at equal intervals (120 degree intervals). The rear end of the thin wire portion 5 is fixed to the guide tube 6, and the sealing lid 4 is pressed backward by the urging force of the elastic member 7, so that the sealing lid 4 and the sealing tube portion 3 are kept sealed. .
The front end portion of the barrel 1 is provided with a front end opening hole through which the front end of the writing body 2 slides so that the front and rear can slide, and the rear end can be slidably disposed on the rear member (tail plug) 2b forming the writing body 2 An end opening hole is provided. A sliding groove 9 is slidable in the longitudinal direction on the side surface of the shaft tube 1, and a guide groove 1a having a locking portion 1b is formed in the distal direction. The rear of the guide groove 1 a is not connected to the rear end opening of the shaft cylinder 1, and the guide groove 1 a forms a window portion closed on the side surface of the shaft cylinder 1. That is, the front end and the rear end (rear end portion 1c) of the guide groove 1a are closed. Further, the rear end portion 1 c of the guide groove 1 a can also be a locking portion of the sliding piece 9 when the writing body 2 is accommodated in the shaft tube 1. Furthermore, a regulation groove 1i is formed in the circumferential direction from the rear end 1c. When not in use, the concave and inclined portion 9e is positioned in the restriction groove 1i, thereby preventing an unexpected intrusion operation. A protrusion 1j is formed on the inner surface of the regulating groove 1i downward so that a concave inclined portion 9e of a base 9b described later can be engaged. That is, the sliding piece 9 is prevented from rotating carelessly with respect to the shaft tube 1.
[0008]
Next, the seal cylinder part 3 will be described in detail. A seal part 3 a having a semicircular cross section is formed in an annular shape behind the inner surface of the seal cylinder part 3. The seal portion 3a is formed in two upper and lower stages, and is a portion that slides fluidly with the front member 2a of the writing body 2. That is, although it is a part which interrupts | blocks the inner space part 3b and the outer side of the seal | sticker cylinder part 3, it can slide relatively. Specifically, since the seal tube portion 3 is fixed to the shaft tube 1, the writing body 2 (front member 2 a) slides with respect to the seal tube portion 3. Further, the inner space portion 3 b has an inner diameter that is substantially the same as the outer diameter of the writing portion 10 of the writing body 2. By making the inner space portion 3b as small as possible, the drying of the writing unit 10 prevents the ink from the writing unit 10 from drying. However, a large diameter portion 3 c is formed at the position of the inner space portion 3 b corresponding to the writing portion 10. In addition to preventing the ink adhering to the writing portion 10 from being transferred to the inner space portion 3b, the ink is prevented from wrapping around the seal portion 3a due to capillary action. Although it is a large-diameter portion, it is a large-diameter portion that does not cause capillary action, and specifically, the inner diameter is about 0.8 mm larger than the other portions, but 0.6 mm If it is about -1.0 mm, the same effect is achieved.
[0009]
The sliding piece 9 includes a button portion 9a on the outer side of the shaft tube 1, a base portion 9b that slides and locks in the guide groove 1a, and an inner portion 9c that holds the writing body 2 on the inner side of the shaft tube 1. . In FIG. 1, the rear part of the base part 9b of the sliding piece 9 is disposed in contact with the rear end part 1c of the guide groove 1a or with a slight gap.
FIG. 3 is a partial longitudinal sectional view showing a state in which the writing body 2 protrudes (writing state). The concave inclined portion 9e formed on the rear side of the base portion 9b of the sliding piece 9 is locked to the acute locking portion (protrusion) 1b of the shaft tube 1 so that the writing state can be maintained. In this state, by appropriately rotating the button portion 9a of the sliding piece 9 about the longitudinal axis, the locking of the base portion 9b of the sliding piece 9 and the guide groove locking portion 1b is released, and the cursive body 2 is stored. Can move on.
FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1. The inner portion 9 c of the sliding piece 9 holds the writing body 2, and the sliding piece 9 is disposed so as to be rotatable about a substantially longitudinal axis. Has been. More specifically, the cursive body front member 2a and the cursive body rear member 2b are detachably connected and fixed by screwing, and the inner portion 9c is loosely attached to the screwing part. That is, the inner part 9c is integrated with the cursive body 2 in a state of being sandwiched between the cursive body front member 2a and the cursive body rear member 2b. Moreover, the said cursive front member 2a and the cursive back member 2b are connected by screwing, and the front part of the screwing structure is an airtight structure. Specifically, the circumferential rib formed on the inner surface of the cursive front member 2a is in contact with the flat surface portion 2f formed on the cursive back member 2b, and the airtight structure is in contact with each other by pressure contact and deformation. It has become. As a result, the ink of the ink occlusion body, which will be described later, does not evaporate from the airtight structure part or has a screwed structure that is extremely difficult to evaporate.
[0010]
An ink occlusion body composed of a fiber bundling body is inserted inside the cursive front member 2a and the cursive front member 2b connected by the airtight structure, but a porous material such as sponge, urethane or cotton is used. It may be the body. And the coating body which consists of a thin film-like member is wound around the surface of the ink occlusion body which consists of the said fiber bundling body, You may form several fine through-holes in the coating body.
FIG. 5 is an exploded perspective view of main components. The inner portion 9c of the sliding piece 9 is rotatably disposed on a reduced diameter portion (in the present embodiment, the rear member 2b side) 2c formed by the front member 2a and the rear member 2b, which is fitted to the writing body 2. ing. Reference numeral 2 d is a locking rib formed on the cursive front member 2 a, and the locking rib 2 d is engaged with the guide cylinder 6. That is, the cursive front member 2a and the guide cylinder 6 are relatively incapable of rotating.
[0011]
【The invention's effect】
The present invention is a retractable writing instrument in which a cursive body that can be projected and retracted from the front end of a shaft cylinder is provided, and a lid is opened and closed in conjunction with the retracting operation of the cursive body. A large diameter that is arranged so that it can move and the cap is attached to the front part of the seal cylinder part, and the capillary action due to the writing part and the inner part of the writing body does not work in the middle part of the inner part of the seal cylinder part Since the writing portion of the cursive body is positioned on the large diameter portion, the intrusive writing instrument with good incursion stability of the cursive body can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part of a cursive storing state showing an example of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a vertical cross-sectional view of a main part in a state where the cursive body protrudes.
4 is a cross-sectional view of FIG. 3. FIG.
FIG. 5 is an exploded perspective view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Guide groove 1b Engagement part 1c Rear end part 1e Wide part 1f Chamfer 1g Engagement hole 1h Engagement hole 1i Restriction groove 1j Protrusion 2 Writing body 2a Writing body front member 2b Writing body rear member 2c Reduced diameter part 2d Locking rib 2f Flat part 3 Seal cylinder part 4 Seal lid 5 Thin diameter part 6 Guide cylinder 7 Repellent member 8 Clip 9 Sliding piece 9a Button part 9b Base part 9c Inner part 9e Inclined part 9g Chamfered part

Claims (3)

A retractable writing instrument that has a cursive body that can be projected and retracted from the front end of the shaft cylinder, and the lid opens and closes in conjunction with the retracting operation of the cursive body. The seal cylinder portion is slidably disposed on the cursive body. The lid is attached in front of the seal tube portion, and a large diameter portion where the capillary phenomenon due to the writing portion and the inner portion of the writing body does not work is formed in the intermediate portion of the inner portion of the seal tube portion. A retractable writing instrument, wherein a writing part of a cursive body is positioned on the large diameter part .   2. The retractable writing instrument according to claim 1, wherein the large-diameter portion of the seal cylinder is formed in the vicinity of the writing portion attached to the tip of the writing body.   The retractable writing instrument according to claim 1 or 2, wherein the outer diameter of the writing part is set to be substantially the same as the outer diameter of the sliding part with respect to the seal cylinder part of the writing body.

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