JP6560611B2 - Writing instrument - Google Patents

Description

The present invention relates to a writing instrument. More specifically, the present invention relates to a writing instrument including a detachable cartridge at a rear end opening on the opposite side of the pen tip side of the shaft tube.

Conventionally, in this type of writing instrument, for example, Patent Document 1 includes a configuration in which a cartridge is provided with a release button that is exposed to the outside, and the surface of the release button is unevenly formed for easy operation. It is disclosed.
Patent Document 2 discloses a configuration in which two grip portions (operation convex portions) for hooking a finger on the outer peripheral surface of the contact portion of the cartridge are provided.

JP 2005-7573 A JP 2005-119272 A

In the writing instruments of Patent Documents 1 and 2, when the cartridge is removed from the writing instrument main body, if the fixing state of the cartridge and the writing instrument main body is strong, there is a possibility that the fingers cannot slip and be easily detached. . Further, if the fixing state between the cartridge and the writing instrument main body is easily set weak in order to obtain easy attachment / detachment of the cartridge, the cartridge may be accidentally dropped from the writing instrument main body.

The present invention solves the above-mentioned conventional problems, can firmly fix the cartridge and the rear end opening of the shaft tube, and can be easily attached and detached from the rear end opening of the shaft tube. It is intended to provide a writing instrument that can.

In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite cartridge side.

The first invention of the present application is a writing instrument comprising a front end hole 21 through which a pen tip 91 projects outside at the front end of the shaft tube 2 and a removable cartridge 3 at the rear end opening 22 of the shaft tube 2. In addition, a notch 23 is formed in the side wall of the rear end opening 22 of the shaft cylinder 2, and the cartridge 3 is protruded rearward from the rear end of the shaft cylinder 2, and the rear A flange 5 formed circumferentially on the front outer surface of the side cylinder 6, a front cylinder 4 formed on the front outer surface of the flange 5, and an engagement wall formed on the outer surface of the front cylinder 4 And 41, the flange 5 is brought into contact with the rear end of the shaft tube 2 in a state where the front tube portion 4 is inserted into the rear end opening 22 of the shaft tube 2, A mating wall portion 41 is engaged with the cutout portion 23, and the engagement wall portion 41 extends along the shape of the cutout portion 23 and is radially outward. Is formed by a rib protruding, finger, characterized in that the insertable recess 7 is formed between the engaging wall portion 41 and the flange portion 5.

The writing instrument 1 according to the first aspect of the present invention employs the above-described configuration, whereby the fixing state between the cartridge 3 and the rear end opening 22 of the shaft cylinder 2 can be strengthened, and the fingertip is inserted into the recess 7. The cartridge 3 can be easily attached and detached from the rear end opening 22 of the shaft cylinder 2.

The writing instrument 1 of the second invention of the present application is characterized in that, in the writing instrument 1 of the first invention, the engaging wall portion 41 is integrally connected to the flange portion 5.

The writing instrument 1 of the second invention adopts the above-described form, thereby improving the catchability (fitting feeling) between the fingertip and the recess 7, and further, the cartridge 3 from the rear end opening 22 of the shaft tube 2. Can be easily attached and detached.

In the present invention, the cartridge 3 is specifically a writing instrument (for example, a ballpoint pen, a marking pen, a solid core, etc.), an applicator (for example, an adhesive, glue, correction liquid, cleaning liquid, and other various coating liquids). Pens, etc.), transfer tapes (eg, correction tapes, adhesive tapes, marker tapes, etc.), erasers, or heating tools (eg, friction tools, energizing heating tools, etc.) that change the color of a thermochromic ink handwriting by heating. ).

The writing instrument according to the present invention can firmly fix the cartridge and the rear end opening of the shaft tube, and can easily attach and detach the cartridge from the rear end opening of the shaft tube.

It is a partial longitudinal cross-sectional view which shows the pen tip protrusion state of embodiment of this invention. It is a principal part enlarged front view which shows the rear-end part of FIG. It is a principal part perspective view which shows the rear-end opening part of the axial cylinder of FIG. It is a perspective view of the cartridge of FIG. FIG. 5 is a perspective view showing the opposite side of the cartridge of FIG. 4. FIG. 2 is a front view of the cartridge with the cap of FIG. 1 removed. It is a front view which shows the other side of the cartridge of FIG.

Embodiments of the writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 7)

The writing instrument 1 of the present invention is attached to and detached from the shaft tube 2, a plurality of writing bodies 9 that are accommodated in the shaft tube 2 so as to be movable in the front-rear direction and have a pen tip 91, and the rear end opening 22 of the shaft tube 2. And a cartridge 3 which can be freely attached.

The shaft tube shaft tube 2 is a tapered tubular body, and is obtained by a synthetic resin molded body. The shaft cylinder 2 is composed of one part or a combination of a plurality of parts. A front end hole 21 is provided in the front end of the shaft tube 2 in the front-rear direction. The nib 91 of the cursive body 9 appears and disappears from the front end hole 21. A semicircular cutout portion 23 and two engagement holes (a first engagement hole 24 and a second engagement hole 25) are formed on the side wall of the rear end opening 22 of the shaft cylinder 2. . In the present invention, the nib 91 may be fixed to the front end hole 21 of the shaft cylinder 2.

-Notch part The said notch part 23 is penetrated by the side wall of the rear-end opening part 22 of the axial cylinder 2, and is opened to back. The notch 23 is formed at one place, but may be a plurality of places (for example, two places). Examples of the shape of the notch 23 include a semicircular shape, a semi-elliptical shape, a triangular shape, a quadrangular shape (rectangle, square, trapezoid, etc.), a polygonal shape, a V-shape, a U-shape, and the like.

Engagement hole The first engagement hole 24 is formed in front of the notch 23, and the second engagement hole 25 is formed at a position symmetrical to the second engagement hole 25 with respect to the axis. The The first engagement hole 24 and the second engagement hole 25 are provided through the side wall of the shaft tube 2 in the radial direction.

First inward projection, second inward projection Two inward projections from the inner circumferential surface between the first engagement hole 24 and the second engagement hole 25 to the inner surface of the front shaft cylinder 2 ( A first inward projection 26 and a second inward projection 27) are formed.

Cartridge The cartridge 3 includes a main body having a front cylinder portion 4, a flange portion 5, and a rear cylinder portion 6, and a cap 8 detachably attached to the rear cylinder portion 6 of the main body. The main body of the cartridge 3 includes a front cylinder part 4, a flange part 5 integrally provided at the rear end of the front cylinder part 4, and a rear cylinder part 6 integrally provided in front of the flange part 5. Consists of. An ink occlusion body impregnated with ink is accommodated in the main body, and a writing tip 61 connected to the ink occlusion body is attached to the rear cylinder portion 6. The main body and the cap 8 are obtained by a synthetic resin molded body.

Front cylinder part The front cylinder part 4 is inserted into the rear end opening 22 of the shaft cylinder 2.

The engaging wall portion 41 is integrally formed on the outer surface of the engaging wall portion front side cylinder portion 4. The engaging wall portion 41 is formed by a rib having a uniform thickness that extends along the shape of the notch portion 23 and protrudes radially outward. In a state where the cartridge 3 is inserted into the rear end opening 22 of the shaft cylinder 2, the outer surface of the engagement wall 41 is engaged with the notch 23. Both ends of the engaging wall portion 41 are connected to the front surface of the flange portion 5.

First engaging protrusion, second engaging protrusion A first engaging protrusion 42 is integrally formed on the outer surface of the front cylinder part 4 in front of the engaging wall part 41. A second engagement protrusion 43 is integrally formed on the outer surface of the front cylindrical portion 4 at a position symmetrical to the first engagement protrusion 42 and the axis. The first engagement protrusion 42 is lowered and engaged with the first engagement hole 24, and the second engagement protrusion 43 is lowered and engaged with the second engagement hole 25. A connecting rib is integrally formed on the outer surface of the front cylindrical portion 4 between the top outer surface of the engaging wall portion 41 and the first engaging protrusion 42, and the first outer surface of the engaging wall portion 41 and the first outer surface are connected by the connecting rib. The engagement protrusions 42 are connected to each other. Thereby, durability with respect to the bending of the first engagement protrusion 42 is improved.

The first outward projection, the second outward projection, and the outer surface of the front cylindrical portion 4 forward from the intermediate circumferential outer surface between the first engagement projection 42 and the second engagement projection 43 One outward projection 44 and second outward projection 45 are integrally formed. The first outward projection 44 is engaged over the first inward projection 26, and the second outward projection 45 is engaged over the second inward projection 27.

Four engagements between the outer surface of the cartridge 3 and the inner surface of the rear end opening 22 of the shaft cylinder 2 (engagement between the first engagement protrusion 42 and the first engagement hole 24, second engagement protrusion) 43 and the second engagement hole 25, the first outward projection 44 and the first inward projection 26, and the second outward projection 45 and the second inward projection 27. ) Makes it possible to firmly fix the outer surface of the cartridge 3 and the inner surface of the rear end opening 22 of the shaft cylinder 2.

-The collar part The front surface and rear surface of the collar part 5 are formed by a plane perpendicular to the axis. The flange 5 is formed by an annular protrusion that protrudes radially outward. In a state where the cartridge 3 is inserted into the rear end opening portion 22 of the shaft cylinder 2, the front surface of the flange portion 5 is brought into contact with the rear end of the shaft tube 2, and the rear surface of the flange portion 5 contacts the opening end of the cap 8. Touched. Further, in this state, the outer peripheral surface of the flange portion 5 is coincident with the outer peripheral edge portion of the rear end opening 22 of the shaft tube 2 and does not protrude in the radial direction from the outer peripheral surface of the shaft tube 2.

The concave portion The front surface of the flange portion 5 and both ends of the engagement wall portion 41 are integrally connected. A semicircular recess 7 is formed from the front surface of the flange portion 5 and the inner surface of the engagement wall portion 41. The recess 7 has a size that allows a fingertip to be inserted. The recess 7 is set to a depth of 3 mm to 5 mm, a maximum width in the front-rear direction of 3 mm to 5 mm, and a maximum width of 8 mm to 10 mm in the circumferential direction.

In the state where the rear cylinder cartridge 3 is inserted into the rear end opening 22 of the shaft cylinder 2, the rear cylinder section 6 projects rearward from the rear end of the shaft cylinder 2. A writing tip portion 61 projects from the rear end of the rear cylinder portion 6.

The cap cap 8 is a bottomed cylindrical body and is obtained from a synthetic resin molded body. A cap 8 is detachably attached to the outer peripheral surface of the rear cylinder portion 6 by screwing or fitting. The inner peripheral surface of the cap 8 is in close contact with the outer peripheral surface of the rear cylinder portion 6, whereby the writing tip portion 61 is sealed.

-Cartridge replacement (removal of cartridge)
When a fingertip is inserted into the concave portion 7 of the cartridge 3, the fingertip is hooked on the front surface of the collar portion 5, and the cartridge 3 is pulled rearward with respect to the shaft cylinder 2, a sufficient force is applied to the cartridge 3 rearwardly. And the engagement of the four positions with the inner surface of the rear end opening 22 of the shaft cylinder 2 can be released at once, and the cartridge 3 can be easily removed.

・ Replace cartridge (insert cartridge)
The front cylinder part 4 of the cartridge 3 is temporarily inserted into the rear end opening 22 of the shaft cylinder 2, the fingertip is inserted into the recess 7 of the cartridge 3, the fingertip is hooked on the inner surface of the engagement wall 41, and the cartridge 3 is moved forward. When pressed, a sufficient forward force is applied to the cartridge 3, and the outer surface of the cartridge 3 and the inner surface of the rear end opening 22 of the shaft tube 2 can be brought into engagement at four locations at once, so that the cartridge 3 can be easily inserted. Can be worn.

The writing instrument 1 of the present embodiment is a writing instrument that includes a front end hole 21 from which a pen tip 91 protrudes to the outside at the front end of the shaft cylinder 2, and a removable cartridge 3 at the rear end opening 22 of the shaft cylinder 2. A notch portion 23 is formed in the side wall of the rear end opening 22 of the shaft tube 2, and the cartridge 3 is protruded rearward from the rear end of the shaft tube 2; A flange 5 formed circumferentially on the front outer surface of the rear cylinder 6, a front cylinder 4 formed on the front outer surface of the flange 5, and an engagement formed on the outer surface of the front cylinder 4 A wall portion 41, and in a state where the front tube portion 4 is inserted into the rear end opening 22 of the shaft tube 2, the flange portion 5 is brought into contact with the rear end of the shaft tube 2, An engagement wall 41 is engaged with the notch 23, and the engagement wall extends along the shape of the notch 23 and is radially outward. And a recess 7 into which a fingertip can be inserted is formed between the engagement wall portion 41 and the flange portion 5, so that the rear end opening portion 22 of the cartridge 3 and the shaft tube 2 is formed in advance. The cartridge 3 can be easily detached from the rear end opening 22 of the shaft tube 2 by inserting the fingertip into the recess 7.

In the writing instrument 1 according to the present embodiment, the engagement wall portion 41 is integrally connected to the collar portion 5 to improve the catchability (fitting feeling) between the fingertip and the recess 7. The cartridge 3 can be easily attached and detached from the rear end opening 22.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Shaft cylinder 21 Front end hole 22 Rear end opening part 23 Notch part 24 1st engagement hole 25 2nd engagement hole 26 1st inward protrusion 27 2nd inward protrusion 3 Cartridge 4 Front side cylinder part 41 Engagement wall portion 42 First engagement projection 43 Second engagement projection 44 First outward projection 45 Second outward projection 5 ridge portion 6 rear cylinder portion 61 writing tip portion 7 recess portion 8 cap 9 writing body 91 Nib

Claims (2)

A writing instrument comprising a front end hole from which a pen tip projects outside at a front end of a shaft tube, and a detachable cartridge at a rear end opening of the shaft tube,
A notch is formed in the side wall of the rear end opening of the shaft cylinder,
The cartridge is formed on a rear cylindrical portion that protrudes rearward from a rear end of the shaft tube, a collar portion that is circumferentially formed on a front outer surface of the rear cylinder portion, and a front outer surface of the collar portion. A front cylinder part, and an engagement wall part formed on the outer surface of the front cylinder part,
In a state where the front cylinder portion is inserted into the rear end opening of the shaft cylinder, the flange portion is brought into contact with the rear end of the shaft cylinder, and the engagement wall portion is engaged with the notch portion. And
The engaging wall portion is formed by a rib extending along the shape of the notch and projecting radially outward, and a recess into which a fingertip can be inserted is provided between the engaging wall portion and the flange portion. A writing instrument characterized by being formed. The writing instrument according to claim 1, wherein the engaging wall portion is integrally connected to the collar portion.

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