JPS622150Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marking pen widely used as a writing instrument, and in particular to an improvement of an ink holder for a marking pen.

Conventionally, marking pens have a fibrous body impregnated with water-based or oil-based ink to form an ink holder, and this ink holder is housed in a cylindrical metal or plastic container, with the tip of the writing core attached to the outside of the container. It is common that the writing core protrudes from the writing core and the other end is inserted into the ink holder so that the ink inside the ink holder is sucked and supplied from the other end of the writing core to the tip. However, the ink holder is constructed by wrapping a fibrous body with a flat thin film of cellophane, polyester, etc., or by coating the surface of the fibrous body with plastic. The surface of the ink holder was mainly smooth. On the other hand, metal or plastic containers have a tapered part for protruding the core or for screwing and fastening the inner lid for holding the core. Therefore, when inserting the ink holder as described above into a container, the air inside the container cannot be exchanged smoothly at the joint between the tapered part of the inner wall of the container and the tip of the ink holder, and therefore, the ink from the core body cannot be exchanged smoothly. flow is obstructed. For this reason, air circulation within the container is usually achieved by inserting a narrow tube inside the ink holder, forming a groove on the inner wall of the tapered part of the container, or installing a ring at the tip of the ink holder. I used to be.

The present invention was devised in view of these circumstances, and by adding a simple modification to the structure of the ink holder itself, air circulation within the container is achieved, and ink flows smoothly from the core. The purpose of the present invention is to provide a marking pen that has the following features.

In order to achieve this object, the present invention proposes a marking pen in which an ink holder made of a fibrous body impregnated with ink is contained in a cylindrical container, the tip of a writing core protrudes outward from the container while the other end is inserted into the ink holder, and ink inside the ink holder is sucked and supplied from the other end of the writing core to the tip, characterized in that the ink holder is constructed by wrapping a fibrous body in an outer covering having a plurality of protrusions extending axially outward.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, a cylindrical container 1 is molded from metal such as aluminum or plastic, and has a constricted portion 1a with a reduced diameter at one end for fixing a writing core 2, and this constricted portion There is a tapered part 1 between 1a and the cylindrical part of the container 1.
Continuous with b. The other end of the container 1 is closed with a lid 1c provided thereon, or is closed as an integral structure (not shown). As shown in FIG. 2, the ink holder 4 has a fibrous body 5 made of acetate or the like wrapped around an outer sheath 6 having a plurality of protrusions 7 extending in the axial direction so that at least these protrusions 7 are on the outer periphery. It is composed of

FIG. 3 is a cross-sectional view of an embodiment in which a resin thin film is used as the outer cover 6, and the protrusions 7 may be on one side of the thin plate 6, a, b, or both sides. Good c, d. However, if the protrusions 7 are present on only one side, it is necessary to wrap the fiber body 5 so that these protrusions 7 are on the outer periphery. If they are on both sides, they can be in the same position c, and they can be staggered d. Further, the cross-sectional shape of the protrusion 7 may be semicircular (a, c, d), triangular (b), or other shapes. In the embodiment shown in FIG. 3, the protrusions 7 are provided in parallel at equal intervals, but the protrusions 7 do not necessarily have to be equally spaced. In addition, it is also possible to use a commercially available resin film having such protrusions. It is also conceivable that the outer sheath 6 has a cross section with the above-mentioned protrusions on the outer surface when resin coating is applied to the surface of the fiber.

After forming the ink holding body 4 as shown in FIG. 2, the fibrous body 5 is impregnated with water-based or oil-based ink and loaded into the container 1. The writing core 2 is made of plastic, metal, ceramic, or fibrous material, and the intermediate core 3 is made of softer fibrous material.
or directly inserted into the ink holder 4.
Fixed. The tip writing portion of the writing core 2 protrudes from the container 1 to the outside. As ink is supplied to the writing object as it is written with this tip writing section, the core body 2 and the relay core 3 become under negative pressure, and the ink inside the fiber body 5 is transferred to the core body 2 due to the capillary phenomenon. It is supplied to the writing section at the tip.

Now, in the present invention, since the ink holder 4 is constructed by surrounding the fibrous body 5 with a jacket 6 having an axial protrusion 7 on the outer surface, the tapered part 1b of the container 1 and the ink holder 4 are At the joint A with the tip,
The protrusion 7 comes into contact with at least a part of the tapered part of the inner wall of the container, and as a result, a gap is created at the joint A, and an air passage D is also secured in the cylindrical inner wall of the container 1, so that the front area of the container 1 is Air exchange between B and rear area C, that is, the air or gas pressure inside the container changes smoothly due to changes in internal pressure due to negative pressure or temperature changes. The ink also flows smoothly. In addition, the protrusion 7 is fixed in axial contact with a part of the inner wall of the container 1 to prevent the ink holder 4 from wobbling within the container 1, and the protrusion 7 increases the hardness of the ink holder 4 itself to hold it. The workability during mechanical loading of the body 4 into the container 1 is also improved.

In the above-mentioned embodiment, the structure in which the writing core 2 and the ink holder 4 are connected by the relay core 3 has been explained and illustrated, but the writing core 2 is inserted directly into the ink holder 4. It is something.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the marking pen of the present invention, FIG. 2 is a perspective view of an ink holder,
FIGS. 3a to 3d are cross-sectional views showing embodiments of the outer jacket having protrusions. DESCRIPTION OF SYMBOLS 1... Container, 2... Writing core, 3... Relay core, 4... Ink holder, 5... Fibrous body, 6...
Outer covering, 7...protrusions.

Claims (1)

[Scope of utility model registration request] An ink holder 4 made of a fibrous body 5 impregnated with ink is housed in a cylindrical container 1, and the tip of the writing core 2 projects outward from the container 1, and the other end is attached to the ink holder 4. In the marking pen, which is inserted into the ink holder so that the ink inside the ink holder is sucked and supplied from the other end of the writing core to the tip, the ink holder 4 has a plurality of protrusions extending outward in the axial direction. A marking pen characterized in that it is constructed by winding a fibrous body with an outer sheath 6 having a diameter of 7.