JP2004330452A - Retractable writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable writing implement which has good stability of protrusion/retraction of a writing body. <P>SOLUTION: In this retractable writing implement wherein the retractable writing body is internally provided from a front end of a barrel and whose lid is opened/closed in synchronization with a retractable motion of the writing body, a seal cylinder part is slidably arranged in the writing body; the lid body is attached ahead of the seal cylinder part; and a large-diameter part is formed in the inward part of the seal cylinder part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable writing instrument in which a writing body that can protrude and retract from the front end of a barrel is provided, and a lid body opens and closes in conjunction with a protruding and retracting operation of the writing body.
[0002]
[Prior art]
As an example, in the main body, a seal cylinder having a through-hole in which the front part of the writing body appears and disappears, a means for passing a thread-like member between the seal cylinder and the main body is provided, and near the distal end hole of the seal cylinder. A seal lid is swingably attached, 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 retracted from the air hole when retracted into the sealing cylinder. A seal body is arranged at the position, and a forward and backward mechanism is provided for advancing the writing body, locking it in the writing state and retracting it to the storage state, and the seal lid and the writing body, even after the sealing lid is opened. A cap having a drying prevention mechanism characterized by being connected by the thread-like member so as to prevent the cursive body from moving forward and to prevent any of the cursive body and the member linked to the cursive body from retreating after the seal lid is closed. There is a 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 conventional configuration, the inside diameter of the small-diameter portion of the distal end of the seal cylinder near the tip writing portion and the external diameter of the small-diameter portion of the writing body are substantially the same. Therefore, the seal (sealing) between the seal cylinder and the writing body is made by the seal body disposed behind the air hole, and the portion of the seal body is a sliding portion between the seal cylinder and the writing body. As described above, since the inside diameter of the small-diameter portion of the tip end of the seal cylinder where the front-end writing portion is located is substantially the same as the outer diameter of the small-diameter portion of the writing body, the portion also slides. That is, the sliding operation between the seal cylinder and the writing body is performed near the tip writing portion. Therefore, there is a high risk that the ink attached to the tip writing portion may wrap around the sliding portion due to a capillary phenomenon or the like, and as a result, the drying of the writing portion may be promoted by solidification of the wrapped ink. There is also a danger of slipping or poor sliding, that is, poor back and forth movement (appearance) of the writing body.
[0005]
[Means for Solving the Problems]
The present invention is a retractable writing instrument in which a writing body which can be protruded and retracted from a front end of a shaft cylinder is provided, and a lid body is opened and closed in conjunction with a movement of the writing body, wherein a sealing cylinder is slid on the writing body. The gist of the present invention is that the cover is movably disposed, the lid is attached to the front of the seal tube, and a large-diameter portion is formed inside the seal tube.
[0006]
[Action]
Despite the small space, a space where the capillary phenomenon does not act is formed near the writing portion.
[0007]
【Example】
One example of the present invention will be described with reference to FIGS. FIG. 1 is a partial vertical sectional view showing a state in which the writing body 2 is stored. A seal cylinder portion 3 is set on the shaft cylinder 1 via a resilient member 7 so as to be immovable rearward (upward in the figure) with a stepped portion. On the rear inner surface of the seal tube portion 3, an inner rib formed of a resin material for keeping the front outer wall of the writing body 2 tightly sealed is formed. In addition, three thin wire portions 5 are formed integrally on the seal lid 4 at radially equal positions (120-degree intervals). The rear end of the thin line portion 5 is fixed to the guide tube 6 and the seal cover 4 is pressed rearward by the urging of the resilient member 7 so that the seal cover 4 and the seal tube portion 3 are kept tightly sealed. .
The distal end portion of the barrel 1 is provided with a distal end opening in which the tip of the writing body 2 slides so that the tip of the writing body 2 can come and go. An end opening hole is provided. A guide groove 1a is formed on a side surface of the barrel 1 so that a slide piece 9 is slidable in the longitudinal direction and a locking portion 1b is formed in a distal direction. The rear of the guide groove 1a is not connected to the rear end opening of the barrel 1, and the guide groove 1a forms a closed window on the side surface of the barrel 1. That is, the front end and the rear end (rear end 1c) of the guide groove 1a are closed. Further, the rear end portion 1c of the guide groove 1a can also serve as a locking portion of the sliding piece 9 when the writing body 2 is housed in the barrel 1. Further, from the rear end 1c, a regulating groove 1i is formed in the circumferential direction. When not in use, the concave inclining portion 9e is positioned in the restricting groove 1i, thereby preventing an unexpected haul-out operation. Note that a projection 1j is formed downward on the inner surface of the regulating groove 1i 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 accidentally rotating with respect to the barrel 1.
[0008]
Next, the seal cylinder 3 will be described in detail. A seal portion 3a having a semicircular cross section is formed annularly behind the inner surface of the seal tube portion 3. The seal portion 3a is formed in two stages, upper and lower, and is a portion that slides on the front member 2a of the writing body 2 in a liquid-tight manner. That is, it is a portion that blocks the inner space portion 3b of the seal tube portion 3 and the outside thereof, but is relatively slidable. Specifically, since the seal cylinder 3 is fixed to the shaft cylinder 1, the writing body 2 (front member 2 a) slides with respect to the seal cylinder 3. The inner diameter of the inner space portion 3b is substantially the same as the outer diameter of the writing portion 10 of the writing body 2. By making the inner space 3b as small as possible, drying of the writing portion 10 is prevented as well as drying of the ink from the writing portion 10. However, a large diameter portion 3c is formed at a position of the inner space portion 3b corresponding to the writing portion 10. The transfer of the ink adhering to the writing portion 10 to the inner space 3b is prevented, and the ink is prevented from flowing around the seal portion 3a due to a capillary phenomenon. Although it is a large-diameter part that does not act on the capillary phenomenon even if it is called a large-diameter part, specifically, it has a larger inner diameter of about 0.8 mm than other parts, but 0.6 mm The same effect is obtained if the distance is about 1.0 mm.
[0009]
The sliding piece 9 includes a button portion 9a outside the barrel 1 and a base 9b that slides and locks in the guide groove 1a, and an inner portion 9c that holds the writing body 2 inside the barrel 1. . In FIG. 1, the rear of the base 9b of the sliding piece 9 is disposed in contact with the rear end 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 behind the base 9b of the slide piece 9 is locked by the sharp locking portion (projection) 1b of the barrel 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 9b of the sliding piece 9 and the guide groove locking portion 1b is released, and the writing body 2 is in the stored state. You can move on to
FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1, in which an inner portion 9 c of the sliding piece 9 embraces the writing body 2 and the sliding piece 9 is disposed rotatably about a substantially longitudinal axis. Have been. More specifically, the cursive front member 2a and the cursive rear member 2b are detachably connected and fixed by screwing, and the inner portion 9c is loosely attached to the screwed portion. That is, the inner portion 9c is integrated with the writing body 2 while being sandwiched between the writing body front member 2a and the writing body rear member 2b. The cursive front member 2a and the cursive rear member 2b are connected by screwing, and the front part of the screwed structure is an airtight structure. Specifically, a circumferential rib formed on the inner surface of the cursive front member 2a comes into contact with the flat portion 2f formed on the cursive rear member 2b, and is pressed and deformed and adhered to each other. Has become. Thus, a screwing structure in which the ink of the ink occluding body described later does not evaporate from the airtight structure portion, or hardly evaporates.
[0010]
An ink occluding body made of a fiber bundle is inserted into the inside of the writing body front member 2a and the writing body front member 2b connected by the airtight structure, but is made of a porous material such as sponge, urethane, or cotton. It may be a body. A covering made of a thin film-like member is wound around the surface of the ink occluding body made of the fiber bundle, but a plurality of fine through holes may be formed in the covering.
FIG. 5 is an exploded perspective view of main components. An inner portion 9c of the sliding piece 9 is rotatably disposed on a reduced diameter portion (the rear member 2b side in this embodiment) 2c formed by the front member 2a and the rear member 2b, which is fitted to the writing body 2. ing. Reference numeral 2d denotes a locking rib formed on the cursive front member 2a, and the locking rib 2d is engaged with the guide cylinder 6. That is, the cursive front member 2a and the guide cylinder 6 cannot rotate relatively.
[0011]
【The invention's effect】
The present invention relates to a retractable writing instrument in which a writing body that can protrude and retract from the front end of a shaft cylinder is provided, and a lid body opens and closes in conjunction with the operation of the writing body to protrude and retract. It is movably arranged, and the lid is attached to the front of the seal tube portion, and a large diameter portion is formed in the inner portion of the seal tube portion. can do.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a main part of a cursive housing 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 of a cursive body projecting state.
FIG. 4 is a cross-sectional view of FIG.
FIG. 5 is an exploded perspective view.
[Explanation of symbols]
1 Shaft cylinder 1a Guide groove 1b Locking portion 1c Rear end 1e Wide portion 1f Chamfered portion 1g Locking hole 1h Locking hole 1i Restriction groove 1j Projection 2 Writing body 2a Writing body front member 2b Writing body rear member 2c Reduced diameter part 2d Locking rib 2f Flat portion 3 Seal cylinder portion 4 Seal lid 5 Small diameter portion 6 Guide cylinder 7 Resilient member 8 Clip 9 Sliding piece 9a Button portion 9b Base 9c Inner portion 9e Inclined portion 9g Beveled portion

Claims (3)

A retractable writing tool in which a writing body which can be protruded and retracted from the front end of the shaft cylinder is provided, and a lid body is opened and closed in conjunction with a movement of the writing body, wherein a seal cylinder portion is slidably disposed on the writing body. A retractable writing implement characterized in that the lid is attached to the front of the seal cylinder and a large-diameter portion is formed inside the seal cylinder. 2. The retractable writing implement according to claim 1, wherein a large diameter portion of the seal cylinder is formed near a writing portion attached to a tip of the writing body. The retractable writing implement according to claim 1 or 2, wherein an outer diameter of the writing part is substantially the same as an outer diameter of a sliding part of the writing body with respect to the seal cylinder part.

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