JP2009184299A - Writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing implement can attaining quickly a stable writing posture, and can making a cap capped in a shaft cylinder rear side hardly come off. <P>SOLUTION: In this writing implement, a front shaft part 11 is connected to a rear shaft part 12 to constitute a shaft cylinder 10, the cap 30 is capped removably onto the front shaft part 11, a gripping portion 11c of the front shaft part 11 is formed into a cylindrical shape, the rear shaft part 12 is formed into a rectangular tube shape, and the cap 30 is formed into a rectangular tube shape corresponding to an outer face of the rear shaft part 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a writing instrument in which a pen tip is protected by a removable cap.

Conventionally, this type of writing instrument is designed to protect the pen tip by covering the cylindrical cap on the front side of the cylindrical barrel as in the invention described in Patent Document 1. It is common.
According to this conventional writing instrument, when taking a writing posture, the cap is removed from the front side of the shaft tube, and this cap is put on the rear end side of the shaft tube, so that the grip portion on the front side of the shaft tube However, it is supported at three points by the three fingers of the thumb, index finger, and middle finger, and the base side portion of the index finger abuts against the rear side of the shaft tube.

By the way, when trying to quickly take the writing posture as described above, there are cases where the writing instrument is difficult to stabilize in the hand and the cap is likely to come off.
More specifically, when the writing posture is taken, the shaft tube that comes into contact with the base side of the index finger has a substantially cylindrical shape, so that the shaft tube easily rolls in the circumferential direction, and the position is difficult to be determined.
In addition, due to the quick movement as described above, the cap placed on the rear end side of the shaft tube may rotate in the circumferential direction relative to the shaft tube and loosen off.
Japanese Patent No. 2906391

  The present invention has been made in view of the above-described conventional circumstances, and a problem to be solved by the present invention is to provide a writing instrument that can quickly take a stable writing posture and is difficult to remove the cap on the rear end side of the shaft cylinder. There is.

  The technical means for solving the above-mentioned problem is that the front shaft portion and the rear shaft portion are connected to form a shaft cylinder, and the front shaft portion is detachably covered with the front shaft portion. The grip portion is formed in a cylindrical shape, the rear shaft portion is formed in a rectangular tube shape, and the cap is formed in a rectangular tube shape that follows the outer surface of the rear shaft portion.

  Further technical means is characterized in that the rear shaft portion and the cap have a rectangular tube shape with a substantially square cross section.

  In a further technical means, the rear end side portion of the rear shaft portion and the bottom surface side portion in the cap are formed to be detachable and fitted to the outer surface of the rear shaft portion and the rear shaft portion. A gap that widens toward the rear is secured between the inner surface of the cap at the time.

  In a further technical means, the shaft tube is provided with an engagement / disengagement guide portion that engages with the opening end portion of the cap, and the engagement / disengagement guide portion has an outer surface on the inner surface of the opening end portion of the cap. It is formed into a polygonal shape that follows, and two substantially flat surfaces adjacent to each other in the circumferential direction of the shaft cylinder are connected by a curved surface portion, and this curved surface portion is formed in an inclined shape that approaches the center of the shaft cylinder toward the front. It is characterized by that.

Since the present invention is configured as described above, the following effects can be obtained.
When gripped by the writer, the cylindrical gripping part is supported at three points by the thumb, index finger, and middle finger of the writer's hand, while the substantially flat surface portion of the rear shaft portion is at the base side of the index finger. Abut. Therefore, the writing instrument can be quickly supported by three points to take a writing posture, and the grasped writing instrument is difficult to roll in the circumferential direction and is stable.
Moreover, when the removed cap is put on the rear shaft portion, the outer surface of the rear shaft portion and the inner surface of the cap have the same rectangular tube shape, so that the cap turns around in the circumferential direction against the rear shaft portion. This can be prevented.
Therefore, it is possible to provide a writing instrument in which a stable writing posture can be quickly taken and the cap placed on the rear end side of the shaft tube is difficult to be removed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The writing instrument 1 includes a shaft tube 10 formed by connecting a front shaft portion 11 and a rear shaft portion 12, a refill 20 held in the shaft tube 10 so as to expose the writing portion 21 forward, and a front shaft. And a cap 30 that is detachably covered with respect to the portion 11, and the overall appearance is formed in a square tube shape with a substantially square cross section.

  The shaft cylinder 10 is formed by connecting a front shaft portion 11 and a rear shaft portion 12 in a substantially coaxial manner via a connecting member 13.

The front shaft portion 11 is formed in a substantially cylindrical shape, and a tapered tip opening portion 11a and a recess portion 11b that can be fitted to and removed from a cap 30 described later are provided on the front end side.
The recessed part 11b is formed in the annular | circular shape which continues over a shaft cylinder circumferential direction in the rear side of the front-end | tip part 11a.
The rear end side portion of the front shaft portion 11 is reduced in diameter by one turn, and is inserted into a cylindrical connecting member 13 described later and screwed.
A portion of the front shaft portion 11 that is behind the concave portion 11b and ahead of the portion that is inserted into the connecting member 13 is a gripping portion 11c that is supported by the writer at three points.

  The gripping portion 11c is formed in a cylindrical shape, and a convex pattern 11c1 is provided on the outer peripheral surface to prevent slipping. As another example, the grip portion 11c may be configured by a cylindrical grip made of an elastic material.

  The rear shaft portion 12 is configured in a substantially rectangular tube shape by arranging a substantially flat surface 12c in a square cross section. If it demonstrates in detail, the said surface 12c will be formed in the convex curve shape whose cross section is smooth. And two surfaces 12c and 12c which adjoin substantially orthogonally are connected via the curved surface 12d of R chamfering shape (refer FIG. 2).

Further, the front end side of the rear shaft portion 12 is put on and fitted over a rear side outer surface of a connecting member 13 described later.
A longitudinal rib 12b that extends in the axial direction and protrudes in the centripetal direction is provided on the rear end side in the rear shaft portion 12. A plurality of the vertical ribs 12b are provided so as to be spaced apart in the circumferential direction. The front ends of the vertical ribs 12b receive a coil spring 40 that urges the rear end of the refill 20 forward.

A tail plug 12 a is fitted and fixed to the rear end side of the rear shaft portion 12.
The front end of the tail plug 12a is inserted into the rear shaft 12 and fixed. On the exposed rear side of the tail plug 12a, a recess 12a1 that can be fitted to and removed from the cap 30 is provided. The recess 12a1 is formed in an annular shape that continues in the circumferential direction of the shaft cylinder.

Further, the connecting member 13 includes an engaging / disengaging guide portion 13a disposed on the front end side, an exposed portion 13b located on the rear side of the engaging / disengaging guide portion 13a and exposed substantially flush with the rear shaft portion 12, The connection part 13c which connects the rear-shaft part 12 on the back side of the exposed part 13b consists of.
The inner surface of the connecting member 13 is formed in a substantially cylindrical shape, and has an internal thread portion for screwing and connecting the rear end portion of the front shaft portion 11 on the inner peripheral surface thereof.
In addition, the outer peripheral surface of the connecting portion 13c has a plurality of annular convex portions for getting over and fitting the rear shaft portion 12.

Further, the engaging / disengaging guide portion 13a is formed in a polygonal shape whose outer surface is similar to the inner surface of the opening end portion of the cap 30, and is engaged with the opening end portion of the cap 30, and rotates in the axial tube circumferential direction. The cap 30 is easily removed.
2 and 3, the engagement / disengagement guide portion 13a is formed in a substantially square shape that follows the inner surface of the opening end portion of the cap 30, and has a substantially flat shape adjacent to the axial direction of the shaft cylinder. The two surfaces 13a1 and 13a1 are connected by a convex curved surface portion 13a2. And each curved surface part 13a2 is formed in the inclined shape which approaches a shaft cylinder center toward the front.

  The refill 20 includes a writing unit 21 that is a ball-point pen tip, a batting 22 that holds ink supplied to the writing unit 21, and a batting type that includes an ink derivative 23 that guides the ink of the batting 22 to the writing unit 21. It is a ballpoint pen refill, and is fixed so as not to move in the shaft tube 10 by being pressed by the coil spring 40 from the rear side.

  The cap 30 includes a cap body 31 that has a rectangular tube shape that follows the outer surface of the rear end portion of the rear shaft portion 12, a fitting / removing member 32 that is fixed inside the front end of the cap body 31, and a front end opening of the cap body 31 The plug member 33 is configured to include a seal rubber 34 disposed on the front end side in the fitting / removing member 32 and elastically contacting the front end of the writing unit 21.

The cap body 31 is formed in a rectangular tube shape that is slightly larger than the rear end side portion of the rear shaft portion 12 so as to be able to cover the rear shaft portion 12.
When the cap 30 is fitted to the rear end side of the rear shaft portion 12 via the fitting / removing member 32 described later (see FIG. 1C), the inner surface of the cap body 31 is connected to the outer surface of the rear shaft portion 12. A gap s that widens toward the rear is secured.

The fitting / removal member 32 is a substantially cylindrical member having a reduced diameter on the front end side of the outer peripheral surface, and the front end side portion of the fitting member 32 with respect to the space on the axial tube center side of the rib 31a formed on the front end side in the cap body 31 It is inserted from the rear side (see FIG. 5).
And this fitting / removal member 32 makes the step part 32b which has the boundary of a front side part and a rear side part contact | abut to the said rib 31a, and the uneven | corrugated | grooved part 32c formed in the front side part to the plug member 33 mentioned later By being fitted, it is fixed so as not to move in the axial direction.
The fitting / removing member 32 has an inward protruding portion 32a that can be fitted / removed with respect to both the recessed portion 11b of the front shaft portion 11 and the recessed portion 12a1 of the tail plug 12a. The inward convex portion 32a is formed in an annular shape that can be fitted and removed in the axial direction of the shaft relative to both the concave portions 11b and 12a1.

The plug member 33 is formed in a substantially bottomed cylindrical shape, and has a substantially square annular flange portion 33 a that abuts against the front end of the cap body 31 on the front end side outer peripheral surface thereof.
The plug member 33 has an uneven portion 33b on the inner peripheral surface thereof for fitting the fitting / removing member 32 in the axial direction.
Further, the rear side of the plug member 33 with respect to the plug member 33 is formed in a substantially cylindrical shape, and a shaft cylinder is provided on the outer circumferential surface thereof at predetermined intervals in the circumferential direction (approximately 90 degrees in the illustrated example). A concave groove 33c (see FIGS. 5 and 4) extending in the axial direction is formed.

Each concave groove 33c fits with a protrusion 31b formed on the front end side of the inner peripheral surface of the cap body 31 in the axial direction. The fitting prevents the plug member 33 from rotating in the circumferential direction with respect to the cap body 31 and prevents the fitting / removing member 32 from coming off from the plug member 33.
More specifically, when the cap 30 is pulled out from the front end side of the shaft tube 10, an axial force that causes the fitting / removing member 32 to come out of the plug member 33 acts, but the groove 33 c and the protrusion 31 b Since the expansion of the diameter of the plug member 33 is suppressed by the contact, the uneven fitting state between the outer peripheral surface of the fitting / removing member 32 and the inner peripheral surface of the plug member 33 is maintained. Therefore, the fitting / removing member 32 can be prevented from coming off from the plug member 33.
Further, since the inner surface of the cap body 31 is partially brought into contact with the outer peripheral surface of the front end side portion of the plug member 33 by the protrusion 31b, when the plug member 33 is assembled to the cap body 31 at the time of manufacture. The resistance is relatively small and the assembly workability is good.

Next, the effect of the writing instrument 1 having the above configuration will be described in detail.
First, when removing the cap 30 from the shaft tube 10, the cap 30 may be slightly rotated in the circumferential direction with respect to the shaft tube 10 as shown in FIGS.
When the cap 30 rotates, the substantially flat portion 30a (see FIG. 3) on the inner surface rides on the curved surface portion 13a2 and moves forward so as to be pushed by the curved surface portion 13a2. And by this movement, the inward convex part 32a of the fitting / removing member 32 in the cap 30 is removed from the concave part 11b on the front end side of the shaft tube 10.
Therefore, the cap 30 can be easily removed from the shaft tube 10.

The removed cap 30 is put on the rear end side of the rear shaft portion 12 and pressed forward in the axial direction. Then, the inward convex part 32a of the fitting / removing member 32 in the cap 30 fits into the concave part 12a1 of the tail plug 12a.
This mounting operation can be easily performed because the rear end side of the rear shaft portion 12 is narrowed rearward to secure the gap s between the inner surface of the cap 30.
In addition, since the gap s is secured between the inner surface of the cap 30 and the outer surface of the rear shaft portion 12 after the mounting, the opening end portion and inner surface of the cap 30 abuts on the outer surface of the rear shaft portion 12 and the outer surface of the rear shaft portion 12. Can be prevented from being damaged.

  In addition, even if the cap 30 attached to the rear portion of the rear shaft portion 12 comes into contact with a hand or an object, the inner surface of the cap 30 and the outer surface of the rear shaft portion 12 are both substantially square-shaped. It is difficult to rotate with respect to the cylinder 10, and as a result, it does not easily come off the shaft cylinder 10.

  As shown in FIG. 4, when gripped by the writer, the cylindrical gripping portion 11 c is supported at three points by the thumb, index finger, and middle finger of the writer, The flat surface 12c contacts the base side of the index finger. Therefore, the writing instrument 1 can be quickly supported by three points to take a writing posture, and the grasped writing instrument 1 is stable and difficult to roll in the circumferential direction.

  According to the illustrated example, the rear shaft portion 12 and the cap 30 are formed in a substantially square cross section, but as another example, a polygonal shape such as a triangular cross section or a hexagonal cross section can be used.

  Moreover, according to the example of illustration, although the axial cylinder 10 was comprised by the several member which consists of the front axial part 11, the rear axial part 12, the connection member 13, etc., as another example, this axial cylinder 10 is made into a single member. It is also possible to configure by.

  In the illustrated example, the writing instrument 1 is a ballpoint pen that has a batting ballpoint pen refill in the shaft tube. However, as another example, a ballpoint pen that has a liquid refill in the shaft tube or ink directly in the shaft tube. You may make it comprise the inserted ball-point pen, or a sign pen, a mechanical pencil, etc.

(A) is the longitudinal cross-sectional view of the writing instrument which concerns on this invention, (b) is principal part sectional drawing which shows the state which rotated the writing instrument 45 degree | times to the circumferential direction, (c) is a back axis | shaft in the writing instrument. It is principal part sectional drawing which shows the state with which the part was mounted | worn. It is a perspective view which shows the connection member in the writing instrument. It is the figure which made only the cap the cross section in the (III)-(III) line | wire in FIG. 1, (a) shows the state which the cap fitted in the connection member, (b) is the cap turned and the connection member of FIG. The state pushed by the engagement / disengagement guide is shown. It is a perspective view showing the state where the writing instrument was grasped by the writing posture. It is principal part sectional drawing which shows the front-end side part of the writing instrument. FIG. 6 is an end view taken along line (VI)-(VI) in FIG. 5.

Explanation of symbols

1: Writing instrument 10: Shaft tube 11: Front shaft portion 11c: Holding part 12: Rear shaft portion 13: Connection member 13a: Engaging / disengaging guide portion 30: Cap s: Gap

Claims (4)

In the writing instrument formed by connecting the front shaft portion and the rear shaft portion to constitute the shaft tube, and covering the front shaft portion detachably with a cap,
A writing instrument, wherein the grip portion of the front shaft portion is formed in a cylindrical shape, the rear shaft portion is formed in a rectangular tube shape, and the cap is formed in a rectangular tube shape that follows the outer surface of the rear shaft portion.   The writing instrument according to claim 1, wherein the rear shaft portion and the cap have a rectangular tube shape with a substantially square cross section.   A rear end side portion of the rear shaft portion and a bottom surface side portion of the cap are formed to be detachable, and an outer surface of the rear shaft portion and an inner surface of the cap when fitted to the rear shaft portion, The writing instrument according to claim 1, wherein a gap widening toward the rear is secured between the two. The shaft tube is provided with an engagement / disengagement guide portion that engages with an open end portion of the cap,
The engaging / disengaging guide portion has an outer surface formed in a polygonal shape that follows the inner surface of the opening end portion of the cap, and connects two substantially flat surfaces adjacent to each other in the circumferential direction of the shaft cylinder by a curved surface portion. The writing instrument according to any one of claims 1 to 3, wherein the curved surface portion is formed in an inclined shape to approach the center of the shaft cylinder toward the front.

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