JP6719013B2 - Writing instrument - Google Patents

Description

The present invention relates to a writing instrument. In detail, a main body in which ink is stored, a pen body which is arranged at a front end portion of the main body so as to be movable in the front-rear direction, a rear body of the pen body, and a rearward pressing of the pen body. The present invention relates to a writing instrument provided with a valve device which is opened by the above, and an annular ink absorber made of a porous material and arranged around the pen body.

Conventionally, in this type of writing instrument, for example, in Patent Document 1, a tip is screwed to the tip of an ink containing tube containing a quick-drying pigment ink, and a pen body protruding from the tip opening of the tip is pushed back. In this way, in the paint marker that guides the ink to the pen body that operates the pump mechanism arranged inside the tip of the ink containing tube, the ink impregnated body consisting of the dense sponge body part and the coarse sponge body part It is disclosed that the body portion is placed on the pump side and is attached to the outer circumference of the pen body.

Japanese Utility Model Laid-Open No. 59-179081

The writing instrument of Patent Document 1 requires two types of sponge bodies having different densities, which increases the number of parts and complicates assembly work.
Further, in the writing instrument of Patent Document 1, since the pen body is covered with a dense sponge body portion, even if the infiltration of air can be prevented, the dense sponge body portion is in a state filled with ink. However, the air is not sufficiently spread to the rear of the pen body, the ink impregnated in the pen body and the sponge body part cannot be ejected smoothly from the tip of the pen body, and the handwriting may be interrupted or smeared.

The present invention solves the above-mentioned conventional problems and suppresses an increase in the number of parts, and can smoothly discharge the ink inside the pen body and the ink absorber even when stored for a long period of time, and the handwriting is interrupted. An object of the present invention is to provide a writing instrument that can prevent blurring.

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

1st invention of this application WHEREIN: The main body 2 in which the ink was stored inside, the pen body 3 arrange|positioned at the front end part of the said main body 2 so that a front-back direction is movable, and it is arrange|positioned behind the said pen body 3 and A writing instrument comprising a valve device (4) that opens when the pen body (3) is pushed backward and an annular ink absorber (10) made of a porous material that is arranged around the pen body (3). 4, a protrusion 65 is formed on the front side of the ink absorber 10, the protrusion 65 is recessed forward in the rear end of the ink absorber 10, and a high density portion 10a is formed in the rear end of the ink absorber 10. Is characterized by.

Since the writing instrument 1 of the first invention adopts the above-described form, the increase in the number of parts is suppressed, and even if the writing instrument is stored for a long period of time, a sufficient amount of ink is provided in the high-density portion 10a of the ink absorber 10. By holding, it is possible to prevent the pen body 3 from being dried, and it is possible to immediately and smoothly discharge ink after the writing is started. In particular, the high-density portion 10a is partially formed at the rear end of the ink absorber 10 and is not formed over the entire or wide range of the ink absorber 10. Thereby, air circulation to the rear of the pen body 3 is ensured, the ink in the pen body 3 and the ink absorber 10 can be smoothly ejected, and it is possible to prevent the handwriting from being interrupted or blown.
It is preferable that the protruding portion 65 is recessed radially outside the rear end portion of the ink absorber 10. As a result, an ink flow path is secured inside the protrusion 65, and ink from the valve device 4 can be smoothly supplied to the pen body 3 and the ink absorber 10. Examples of the protrusion 65 include a plurality of protrusions distributed in a circumferential shape, or an annular protrusion.

2nd invention of this application WHEREIN: In the writing instrument 1 of the said 1st invention, the said valve apparatus 4 is the valve body 5 contacted by the rear end of the pen body 3, and the closely spaced operation of the said valve body 5. A valve seat member 6 having a valve hole 64 that can be opened and closed, an elastic body 7 that biases the valve body 5 forward, and a valve that houses the valve body 5, the valve seat member 6 and the elastic body 7. It is characterized in that it is formed of a housing cylinder 8 and the protrusion 65 is formed on the front surface of the valve seat member 6.

In the writing instrument 1 of the second invention, since the protrusion 65 is formed on the front surface of the valve seat member 6, no special assembly work is required, and the high-density portion 10a is provided at the rear end of the ink occlusion body. It can be easily formed.

INDUSTRIAL APPLICABILITY The writing instrument of the present invention can suppress an increase in the number of parts and can smoothly eject the ink inside the pen body and the ink absorber even after long-term storage, and can prevent the handwriting from being interrupted or blown.

It is a longitudinal cross-sectional view of the pen body upward state of the embodiment of the present invention. FIG. 2 is an enlarged vertical sectional view of an essential part of the pen body of FIG. 1 in a downward direction. It is a perspective view of the valve seat member of FIG.

An embodiment of a writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 3)

A writing instrument 1 of the present invention includes a main body 2 in which ink is stored, a pen body 3 movably arranged in a front-rear direction at a front end portion of the main body 2, and a pen body 3 arranged behind the pen body 3. A valve device 4 that opens when the pen body 3 is pressed backward, an annular ink absorber 10 that is arranged around the pen body 3 and is made of a porous material, and holds the pen body 3 and the ink absorber 10. The front body 9 and the cap 11 that is detachably attached to the pen body 3 side.

Main body The main body 2 is formed by a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by blow molding of synthetic resin. The front end portion of the main body 2 has a reduced diameter, and a threaded portion 21 is formed on the outer surface thereof.
Ink and a stirring member 12 are accommodated in the main body 2.

-Pen body The pen body 3 is a resin-processed body of a rod-shaped fiber bundle. Both ends of the pen body 3 are tapered. Convex curved surfaces are formed on the tops of the tapered ends of the pen body 3.

Ink Absorber The ink absorber 10 is a synthetic resin continuous pore body (elastic sponge) and is formed in an annular shape. The ink absorber 10 has a central hole through which the pen body 3 penetrates.

-Valve device The valve device 4 includes a valve body 5 that is brought into contact with the rear end of the pen body 3, and a valve seat member 6 that includes a valve hole 64 that can be opened and closed by an operation of closely separating the valve body 5. An elastic body 7 for urging the valve body 5 forward, and a valve housing cylinder 8 for housing the valve body 5, the valve seat member 6 and the elastic body 7.

-Valve element The valve element 5 includes a rod-shaped front portion 51, a valve portion 52 integrally formed rearward of the rod-shaped front portion 51, and annularly protruding outward in the radial direction. The rod-shaped rear portion 53 is integrally formed in the rear. The valve body 5 is obtained by injection molding of synthetic resin.

-Valve seat member The valve seat member 6 is a cylindrical body with both ends open, and is obtained by injection molding of synthetic resin. The valve seat member 6 has a front end integrally formed with an annular flange portion 61 that projects radially outward. A tubular portion 62 is integrally formed behind the collar portion 61. A seat portion 63 is integrally formed on the inner surface of the rear end of the tubular portion 62 so as to project inward in the radial direction. A valve hole 64 is formed at the center of the seat 63 in the front-rear direction. The valve portion 52 of the valve body 5 can be closely separated from the seat portion 63. On the front surface of the valve seat member 6, a plurality of protrusions 65 dispersedly arranged in a circle are integrally formed. The projecting portion 65 projects forward from the collar portion 61.

-Elastic body The elastic body 7 is composed of a compression coil spring. The rod-shaped rear portion 53 of the valve body 5 is inserted into the elastic body 7. The front end of the elastic body 7 is locked to the rear surface of the valve portion 52 of the valve body 5, and the valve body 5 is biased forward. The rear end of the elastic body 7 is locked to the locking wall portion 83 of the valve housing cylinder 8.

-Valve housing cylinder The valve housing cylinder 8 is a cylindrical body with both ends open, and is obtained by injection molding of synthetic resin. The valve accommodating cylinder 8 has a front end integrally formed with an annular flange 81 protruding radially outward. A tubular portion 82 is integrally formed behind the collar portion 81. On the inner surface of the rear end of the tubular portion 82, a locking wall portion 83 that projects inward in the radial direction is integrally formed. A guide hole 84 is provided in the center of the locking wall portion 83 in the front-rear direction, and the rod-shaped rear portion 53 of the valve body 5 is inserted into the guide hole 84. A plurality of ink circulation holes 85 are provided in the rear side wall of the cylindrical portion 82 in the radial direction. The outer surface of the tubular portion 61 of the valve seat member 6 is press-fitted and fixed to the inner surface of the front end opening of the tubular portion 82 of the valve housing cylinder 8. The front surface of the flange 81 of the valve housing cylinder 8 is in close contact with the rear surface of the flange 61 of the valve seat member 6. The front surface of the flange 81 of the valve housing cylinder 8 is in close contact with the front end of the main body 2. The outer surface of the front end portion of the tubular portion 82 of the valve housing cylinder 8 is press-fitted and fixed to the inner surface of the front end opening portion of the main body 2. The valve body 5, the valve seat member 6 and the elastic body 7 are housed in the valve housing cylinder 8 to obtain a unitized valve device 4.

-Front body The front body 9 is a tapered cylindrical body having both ends opened, and is obtained by injection molding of synthetic resin. A plurality of vertical ribs 91 extending in the front-rear direction are formed on the inner surface of the front end portion of the front body 9, and the vertical ribs 91 slidably hold the pen body 3. A threaded portion 92 is formed on the inner surface of the rear end of the front body 9. The threaded portion 92 on the inner surface of the rear end of the front body 9 is screwed to the threaded portion 21 on the outer surface of the front end of the main body 2. An annular step portion 93 is formed on the inner surface of the front body 9 in front of the threaded portion 92. The annular step portion 93 is brought into close contact with the front surface of the flange portion 61 of the valve seat member 6. The flange portion 61 of the valve seat member 6 and the flange portion 81 of the valve housing cylinder 8 are provided between the annular step portion 93 of the front body 9 and the front end of the main body 2 by screwing the front body 9 and the main body 2 together. It is sandwiched in the front-back direction.

A locking step portion 94 is formed in front of the annular step portion 93 on the inner surface of the front body 9. An ink absorber 10 is housed inside the front body 9. The front surface of the ink absorber 10 is locked to the locking step portion 94.

The protrusion 65 on the front surface of the valve seat member 6 is recessed forward in the rear end portion of the ink absorber 10. As a result, a high density portion 10a is formed at the rear end portion of the ink absorber 10. The protrusion 65 is recessed radially outside the rear end of the ink absorber 10. As a result, an ink flow passage is secured inside the protrusion 65 in the radial direction, and ink from the valve device 4 can be smoothly supplied to the pen body 3 and the ink absorber 10.

A writing instrument 1 according to the present embodiment is provided with a main body 2 in which ink is stored, a pen body 3 movably arranged in a front-rear direction at a front end portion of the main body 2, and a rear side of the pen body 3. A writing instrument provided with a valve device (4) that opens when the pen body (3) is pushed rearward and an annular ink absorber (10) made of a porous material and arranged around the pen body (3). A protrusion 65 is formed on the front side of the device 4, the protrusion 65 is recessed forward in the rear end of the ink absorber 10, and a high density portion 10a is formed in the rear end of the ink absorber 10. As a result, it is possible to prevent the pen body 3 from drying by holding the sufficient amount of ink in the high density portion 10a of the ink absorber 10 even when the number of parts is suppressed from increasing and the writing implement is stored for a long time. Ink can be discharged smoothly immediately after writing is started. In particular, the high-density portion 10a is partially formed at the rear end portion of the ink absorber 10 and is not formed over the entire or wide range of the ink absorber 10. Thereby, air circulation to the rear of the pen body 3 is ensured, the ink in the pen body 3 and the ink absorber 10 can be smoothly ejected, and it is possible to prevent the handwriting from being interrupted or blown.

In the writing instrument 1 of the present embodiment, since the valve device 4 has the protrusion 65 formed on the front surface of the valve seat member 6, no special assembly work is required, and the writing device 1 is provided at the rear end of the ink occlusion body. The high density portion 10a can be easily formed.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Main body 21 Threaded portion 3 Pen body 4 Valve device 5 Valve body 51 Rod-shaped front portion 52 Valve portion 53 Rod-shaped rear portion 6 Valve seat member 61 Collar portion 62 Cylindrical portion 63 Seat portion 64 Valve hole 65 Projection portion 7 Resilient body 8 Valve housing cylinder 81 Collar portion 82 Cylindrical portion 83 Locking wall portion 84 Guide hole 85 Ink flow hole 9 Front body 91 Vertical rib 92 Threaded portion 93 Annular step portion 94 Locking step portion 10 Ink absorber 10a High-density part 11 Cap 12 Stirring member

Claims (2)

A main body in which ink is stored, a pen body that is movably arranged in a front-rear direction at a front end portion of the main body, and a valve that is arranged behind the pen body and is opened by pressing the pen body rearward. device and, a porous material composed of a writing tool having an annular ink absorber, the high density portion is the portion radially outward of the rear end portion of the front Symbol ink absorber disposed around the pen body writing instrument characterized in that it is formed. The valve device includes a valve body that is in contact with a rear end of a pen body, a valve seat member that includes a valve hole that can be opened and closed by an operation of closely separating the valve body, and an elastic member that biases the valve body forward. A valve body, a valve housing cylinder for housing the valve body, the valve seat member and the elastic body, and the valve housing cylinder is press-fitted and fixed to the inner surface of the front end opening of the main body, and the outer surface of the front end portion of the main body The front body is screwed to the front body, the pen body is slidably held on the inner surface of the front end portion of the front body, the ink absorber is housed inside the front body, and the valve seat member is formed on the inner surface of the front body. The writing instrument according to claim 1 , wherein an annular step portion is formed in close contact with the collar portion, and the high-density portion is formed in front of the annular step portion .

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